Bug Summary

File:lib/CodeGen/AsmPrinter/AsmPrinter.cpp
Warning:line 2507, column 44
Called C++ object pointer is null

Annotated Source Code

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clang -cc1 -triple x86_64-pc-linux-gnu -analyze -disable-free -disable-llvm-verifier -discard-value-names -main-file-name AsmPrinter.cpp -analyzer-store=region -analyzer-opt-analyze-nested-blocks -analyzer-checker=core -analyzer-checker=apiModeling -analyzer-checker=unix -analyzer-checker=deadcode -analyzer-checker=cplusplus -analyzer-checker=security.insecureAPI.UncheckedReturn -analyzer-checker=security.insecureAPI.getpw -analyzer-checker=security.insecureAPI.gets -analyzer-checker=security.insecureAPI.mktemp -analyzer-checker=security.insecureAPI.mkstemp -analyzer-checker=security.insecureAPI.vfork -analyzer-checker=nullability.NullPassedToNonnull -analyzer-checker=nullability.NullReturnedFromNonnull -analyzer-output plist -w -analyzer-config-compatibility-mode=true -mrelocation-model pic -pic-level 2 -mthread-model posix -fmath-errno -masm-verbose -mconstructor-aliases -munwind-tables -fuse-init-array -target-cpu x86-64 -dwarf-column-info -debugger-tuning=gdb -momit-leaf-frame-pointer -ffunction-sections -fdata-sections -resource-dir /usr/lib/llvm-9/lib/clang/9.0.0 -D _DEBUG -D _GNU_SOURCE -D __STDC_CONSTANT_MACROS -D __STDC_FORMAT_MACROS -D __STDC_LIMIT_MACROS -I /build/llvm-toolchain-snapshot-9~svn362543/build-llvm/lib/CodeGen/AsmPrinter -I /build/llvm-toolchain-snapshot-9~svn362543/lib/CodeGen/AsmPrinter -I /build/llvm-toolchain-snapshot-9~svn362543/build-llvm/include -I /build/llvm-toolchain-snapshot-9~svn362543/include -U NDEBUG -internal-isystem /usr/lib/gcc/x86_64-linux-gnu/6.3.0/../../../../include/c++/6.3.0 -internal-isystem /usr/lib/gcc/x86_64-linux-gnu/6.3.0/../../../../include/x86_64-linux-gnu/c++/6.3.0 -internal-isystem /usr/lib/gcc/x86_64-linux-gnu/6.3.0/../../../../include/x86_64-linux-gnu/c++/6.3.0 -internal-isystem /usr/lib/gcc/x86_64-linux-gnu/6.3.0/../../../../include/c++/6.3.0/backward -internal-isystem /usr/include/clang/9.0.0/include/ -internal-isystem /usr/local/include -internal-isystem /usr/lib/llvm-9/lib/clang/9.0.0/include -internal-externc-isystem /usr/include/x86_64-linux-gnu -internal-externc-isystem /include -internal-externc-isystem /usr/include -O2 -Wno-unused-parameter -Wwrite-strings -Wno-missing-field-initializers -Wno-long-long -Wno-maybe-uninitialized -Wno-comment -std=c++11 -fdeprecated-macro -fdebug-compilation-dir /build/llvm-toolchain-snapshot-9~svn362543/build-llvm/lib/CodeGen/AsmPrinter -fdebug-prefix-map=/build/llvm-toolchain-snapshot-9~svn362543=. -ferror-limit 19 -fmessage-length 0 -fvisibility-inlines-hidden -stack-protector 2 -fobjc-runtime=gcc -fdiagnostics-show-option -vectorize-loops -vectorize-slp -analyzer-output=html -analyzer-config stable-report-filename=true -o /tmp/scan-build-2019-06-05-060531-1271-1 -x c++ /build/llvm-toolchain-snapshot-9~svn362543/lib/CodeGen/AsmPrinter/AsmPrinter.cpp -faddrsig

/build/llvm-toolchain-snapshot-9~svn362543/lib/CodeGen/AsmPrinter/AsmPrinter.cpp

1//===- AsmPrinter.cpp - Common AsmPrinter code ----------------------------===//
2//
3// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
4// See https://llvm.org/LICENSE.txt for license information.
5// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
6//
7//===----------------------------------------------------------------------===//
8//
9// This file implements the AsmPrinter class.
10//
11//===----------------------------------------------------------------------===//
12
13#include "llvm/CodeGen/AsmPrinter.h"
14#include "CodeViewDebug.h"
15#include "DwarfDebug.h"
16#include "DwarfException.h"
17#include "WasmException.h"
18#include "WinCFGuard.h"
19#include "WinException.h"
20#include "llvm/ADT/APFloat.h"
21#include "llvm/ADT/APInt.h"
22#include "llvm/ADT/DenseMap.h"
23#include "llvm/ADT/STLExtras.h"
24#include "llvm/ADT/SmallPtrSet.h"
25#include "llvm/ADT/SmallString.h"
26#include "llvm/ADT/SmallVector.h"
27#include "llvm/ADT/Statistic.h"
28#include "llvm/ADT/StringRef.h"
29#include "llvm/ADT/Triple.h"
30#include "llvm/ADT/Twine.h"
31#include "llvm/Analysis/ConstantFolding.h"
32#include "llvm/Analysis/EHPersonalities.h"
33#include "llvm/Analysis/OptimizationRemarkEmitter.h"
34#include "llvm/BinaryFormat/COFF.h"
35#include "llvm/BinaryFormat/Dwarf.h"
36#include "llvm/BinaryFormat/ELF.h"
37#include "llvm/CodeGen/GCMetadata.h"
38#include "llvm/CodeGen/GCMetadataPrinter.h"
39#include "llvm/CodeGen/GCStrategy.h"
40#include "llvm/CodeGen/MachineBasicBlock.h"
41#include "llvm/CodeGen/MachineConstantPool.h"
42#include "llvm/CodeGen/MachineDominators.h"
43#include "llvm/CodeGen/MachineFrameInfo.h"
44#include "llvm/CodeGen/MachineFunction.h"
45#include "llvm/CodeGen/MachineFunctionPass.h"
46#include "llvm/CodeGen/MachineInstr.h"
47#include "llvm/CodeGen/MachineInstrBundle.h"
48#include "llvm/CodeGen/MachineJumpTableInfo.h"
49#include "llvm/CodeGen/MachineLoopInfo.h"
50#include "llvm/CodeGen/MachineMemOperand.h"
51#include "llvm/CodeGen/MachineModuleInfo.h"
52#include "llvm/CodeGen/MachineModuleInfoImpls.h"
53#include "llvm/CodeGen/MachineOperand.h"
54#include "llvm/CodeGen/MachineOptimizationRemarkEmitter.h"
55#include "llvm/CodeGen/StackMaps.h"
56#include "llvm/CodeGen/TargetFrameLowering.h"
57#include "llvm/CodeGen/TargetInstrInfo.h"
58#include "llvm/CodeGen/TargetLowering.h"
59#include "llvm/CodeGen/TargetOpcodes.h"
60#include "llvm/CodeGen/TargetRegisterInfo.h"
61#include "llvm/IR/BasicBlock.h"
62#include "llvm/IR/Comdat.h"
63#include "llvm/IR/Constant.h"
64#include "llvm/IR/Constants.h"
65#include "llvm/IR/DataLayout.h"
66#include "llvm/IR/DebugInfoMetadata.h"
67#include "llvm/IR/DerivedTypes.h"
68#include "llvm/IR/Function.h"
69#include "llvm/IR/GlobalAlias.h"
70#include "llvm/IR/GlobalIFunc.h"
71#include "llvm/IR/GlobalIndirectSymbol.h"
72#include "llvm/IR/GlobalObject.h"
73#include "llvm/IR/GlobalValue.h"
74#include "llvm/IR/GlobalVariable.h"
75#include "llvm/IR/Instruction.h"
76#include "llvm/IR/Mangler.h"
77#include "llvm/IR/Metadata.h"
78#include "llvm/IR/Module.h"
79#include "llvm/IR/Operator.h"
80#include "llvm/IR/RemarkStreamer.h"
81#include "llvm/IR/Type.h"
82#include "llvm/IR/Value.h"
83#include "llvm/MC/MCAsmInfo.h"
84#include "llvm/MC/MCCodePadder.h"
85#include "llvm/MC/MCContext.h"
86#include "llvm/MC/MCDirectives.h"
87#include "llvm/MC/MCDwarf.h"
88#include "llvm/MC/MCExpr.h"
89#include "llvm/MC/MCInst.h"
90#include "llvm/MC/MCSection.h"
91#include "llvm/MC/MCSectionCOFF.h"
92#include "llvm/MC/MCSectionELF.h"
93#include "llvm/MC/MCSectionMachO.h"
94#include "llvm/MC/MCStreamer.h"
95#include "llvm/MC/MCSubtargetInfo.h"
96#include "llvm/MC/MCSymbol.h"
97#include "llvm/MC/MCSymbolELF.h"
98#include "llvm/MC/MCTargetOptions.h"
99#include "llvm/MC/MCValue.h"
100#include "llvm/MC/SectionKind.h"
101#include "llvm/Pass.h"
102#include "llvm/Remarks/Remark.h"
103#include "llvm/Remarks/RemarkStringTable.h"
104#include "llvm/Support/Casting.h"
105#include "llvm/Support/CommandLine.h"
106#include "llvm/Support/Compiler.h"
107#include "llvm/Support/ErrorHandling.h"
108#include "llvm/Support/Format.h"
109#include "llvm/Support/MathExtras.h"
110#include "llvm/Support/Path.h"
111#include "llvm/Support/TargetRegistry.h"
112#include "llvm/Support/Timer.h"
113#include "llvm/Support/raw_ostream.h"
114#include "llvm/Target/TargetLoweringObjectFile.h"
115#include "llvm/Target/TargetMachine.h"
116#include "llvm/Target/TargetOptions.h"
117#include <algorithm>
118#include <cassert>
119#include <cinttypes>
120#include <cstdint>
121#include <iterator>
122#include <limits>
123#include <memory>
124#include <string>
125#include <utility>
126#include <vector>
127
128using namespace llvm;
129
130#define DEBUG_TYPE"asm-printer" "asm-printer"
131
132static const char *const DWARFGroupName = "dwarf";
133static const char *const DWARFGroupDescription = "DWARF Emission";
134static const char *const DbgTimerName = "emit";
135static const char *const DbgTimerDescription = "Debug Info Emission";
136static const char *const EHTimerName = "write_exception";
137static const char *const EHTimerDescription = "DWARF Exception Writer";
138static const char *const CFGuardName = "Control Flow Guard";
139static const char *const CFGuardDescription = "Control Flow Guard Tables";
140static const char *const CodeViewLineTablesGroupName = "linetables";
141static const char *const CodeViewLineTablesGroupDescription =
142 "CodeView Line Tables";
143
144STATISTIC(EmittedInsts, "Number of machine instrs printed")static llvm::Statistic EmittedInsts = {"asm-printer", "EmittedInsts"
, "Number of machine instrs printed", {0}, {false}}
;
145
146static cl::opt<bool> EnableRemarksSection(
147 "remarks-section",
148 cl::desc("Emit a section containing remark diagnostics metadata"),
149 cl::init(false));
150
151char AsmPrinter::ID = 0;
152
153using gcp_map_type = DenseMap<GCStrategy *, std::unique_ptr<GCMetadataPrinter>>;
154
155static gcp_map_type &getGCMap(void *&P) {
156 if (!P)
157 P = new gcp_map_type();
158 return *(gcp_map_type*)P;
159}
160
161/// getGVAlignmentLog2 - Return the alignment to use for the specified global
162/// value in log2 form. This rounds up to the preferred alignment if possible
163/// and legal.
164static unsigned getGVAlignmentLog2(const GlobalValue *GV, const DataLayout &DL,
165 unsigned InBits = 0) {
166 unsigned NumBits = 0;
167 if (const GlobalVariable *GVar = dyn_cast<GlobalVariable>(GV))
168 NumBits = DL.getPreferredAlignmentLog(GVar);
169
170 // If InBits is specified, round it to it.
171 if (InBits > NumBits)
172 NumBits = InBits;
173
174 // If the GV has a specified alignment, take it into account.
175 if (GV->getAlignment() == 0)
176 return NumBits;
177
178 unsigned GVAlign = Log2_32(GV->getAlignment());
179
180 // If the GVAlign is larger than NumBits, or if we are required to obey
181 // NumBits because the GV has an assigned section, obey it.
182 if (GVAlign > NumBits || GV->hasSection())
183 NumBits = GVAlign;
184 return NumBits;
185}
186
187AsmPrinter::AsmPrinter(TargetMachine &tm, std::unique_ptr<MCStreamer> Streamer)
188 : MachineFunctionPass(ID), TM(tm), MAI(tm.getMCAsmInfo()),
189 OutContext(Streamer->getContext()), OutStreamer(std::move(Streamer)) {
190 VerboseAsm = OutStreamer->isVerboseAsm();
191}
192
193AsmPrinter::~AsmPrinter() {
194 assert(!DD && Handlers.empty() && "Debug/EH info didn't get finalized")((!DD && Handlers.empty() && "Debug/EH info didn't get finalized"
) ? static_cast<void> (0) : __assert_fail ("!DD && Handlers.empty() && \"Debug/EH info didn't get finalized\""
, "/build/llvm-toolchain-snapshot-9~svn362543/lib/CodeGen/AsmPrinter/AsmPrinter.cpp"
, 194, __PRETTY_FUNCTION__))
;
195
196 if (GCMetadataPrinters) {
197 gcp_map_type &GCMap = getGCMap(GCMetadataPrinters);
198
199 delete &GCMap;
200 GCMetadataPrinters = nullptr;
201 }
202}
203
204bool AsmPrinter::isPositionIndependent() const {
205 return TM.isPositionIndependent();
206}
207
208/// getFunctionNumber - Return a unique ID for the current function.
209unsigned AsmPrinter::getFunctionNumber() const {
210 return MF->getFunctionNumber();
211}
212
213const TargetLoweringObjectFile &AsmPrinter::getObjFileLowering() const {
214 return *TM.getObjFileLowering();
215}
216
217const DataLayout &AsmPrinter::getDataLayout() const {
218 return MMI->getModule()->getDataLayout();
219}
220
221// Do not use the cached DataLayout because some client use it without a Module
222// (dsymutil, llvm-dwarfdump).
223unsigned AsmPrinter::getPointerSize() const {
224 return TM.getPointerSize(0); // FIXME: Default address space
225}
226
227const MCSubtargetInfo &AsmPrinter::getSubtargetInfo() const {
228 assert(MF && "getSubtargetInfo requires a valid MachineFunction!")((MF && "getSubtargetInfo requires a valid MachineFunction!"
) ? static_cast<void> (0) : __assert_fail ("MF && \"getSubtargetInfo requires a valid MachineFunction!\""
, "/build/llvm-toolchain-snapshot-9~svn362543/lib/CodeGen/AsmPrinter/AsmPrinter.cpp"
, 228, __PRETTY_FUNCTION__))
;
229 return MF->getSubtarget<MCSubtargetInfo>();
230}
231
232void AsmPrinter::EmitToStreamer(MCStreamer &S, const MCInst &Inst) {
233 S.EmitInstruction(Inst, getSubtargetInfo());
234}
235
236void AsmPrinter::emitInitialRawDwarfLocDirective(const MachineFunction &MF) {
237 assert(DD && "Dwarf debug file is not defined.")((DD && "Dwarf debug file is not defined.") ? static_cast
<void> (0) : __assert_fail ("DD && \"Dwarf debug file is not defined.\""
, "/build/llvm-toolchain-snapshot-9~svn362543/lib/CodeGen/AsmPrinter/AsmPrinter.cpp"
, 237, __PRETTY_FUNCTION__))
;
238 assert(OutStreamer->hasRawTextSupport() && "Expected assembly output mode.")((OutStreamer->hasRawTextSupport() && "Expected assembly output mode."
) ? static_cast<void> (0) : __assert_fail ("OutStreamer->hasRawTextSupport() && \"Expected assembly output mode.\""
, "/build/llvm-toolchain-snapshot-9~svn362543/lib/CodeGen/AsmPrinter/AsmPrinter.cpp"
, 238, __PRETTY_FUNCTION__))
;
239 (void)DD->emitInitialLocDirective(MF, /*CUID=*/0);
240}
241
242/// getCurrentSection() - Return the current section we are emitting to.
243const MCSection *AsmPrinter::getCurrentSection() const {
244 return OutStreamer->getCurrentSectionOnly();
245}
246
247void AsmPrinter::getAnalysisUsage(AnalysisUsage &AU) const {
248 AU.setPreservesAll();
249 MachineFunctionPass::getAnalysisUsage(AU);
250 AU.addRequired<MachineModuleInfo>();
251 AU.addRequired<MachineOptimizationRemarkEmitterPass>();
252 AU.addRequired<GCModuleInfo>();
253}
254
255bool AsmPrinter::doInitialization(Module &M) {
256 MMI = getAnalysisIfAvailable<MachineModuleInfo>();
257
258 // Initialize TargetLoweringObjectFile.
259 const_cast<TargetLoweringObjectFile&>(getObjFileLowering())
260 .Initialize(OutContext, TM);
261
262 const_cast<TargetLoweringObjectFile &>(getObjFileLowering())
263 .getModuleMetadata(M);
264
265 OutStreamer->InitSections(false);
266
267 // Emit the version-min deployment target directive if needed.
268 //
269 // FIXME: If we end up with a collection of these sorts of Darwin-specific
270 // or ELF-specific things, it may make sense to have a platform helper class
271 // that will work with the target helper class. For now keep it here, as the
272 // alternative is duplicated code in each of the target asm printers that
273 // use the directive, where it would need the same conditionalization
274 // anyway.
275 const Triple &Target = TM.getTargetTriple();
276 OutStreamer->EmitVersionForTarget(Target, M.getSDKVersion());
277
278 // Allow the target to emit any magic that it wants at the start of the file.
279 EmitStartOfAsmFile(M);
280
281 // Very minimal debug info. It is ignored if we emit actual debug info. If we
282 // don't, this at least helps the user find where a global came from.
283 if (MAI->hasSingleParameterDotFile()) {
284 // .file "foo.c"
285 OutStreamer->EmitFileDirective(
286 llvm::sys::path::filename(M.getSourceFileName()));
287 }
288
289 GCModuleInfo *MI = getAnalysisIfAvailable<GCModuleInfo>();
290 assert(MI && "AsmPrinter didn't require GCModuleInfo?")((MI && "AsmPrinter didn't require GCModuleInfo?") ? static_cast
<void> (0) : __assert_fail ("MI && \"AsmPrinter didn't require GCModuleInfo?\""
, "/build/llvm-toolchain-snapshot-9~svn362543/lib/CodeGen/AsmPrinter/AsmPrinter.cpp"
, 290, __PRETTY_FUNCTION__))
;
291 for (auto &I : *MI)
292 if (GCMetadataPrinter *MP = GetOrCreateGCPrinter(*I))
293 MP->beginAssembly(M, *MI, *this);
294
295 // Emit module-level inline asm if it exists.
296 if (!M.getModuleInlineAsm().empty()) {
297 // We're at the module level. Construct MCSubtarget from the default CPU
298 // and target triple.
299 std::unique_ptr<MCSubtargetInfo> STI(TM.getTarget().createMCSubtargetInfo(
300 TM.getTargetTriple().str(), TM.getTargetCPU(),
301 TM.getTargetFeatureString()));
302 OutStreamer->AddComment("Start of file scope inline assembly");
303 OutStreamer->AddBlankLine();
304 EmitInlineAsm(M.getModuleInlineAsm()+"\n",
305 OutContext.getSubtargetCopy(*STI), TM.Options.MCOptions);
306 OutStreamer->AddComment("End of file scope inline assembly");
307 OutStreamer->AddBlankLine();
308 }
309
310 if (MAI->doesSupportDebugInformation()) {
311 bool EmitCodeView = MMI->getModule()->getCodeViewFlag();
312 if (EmitCodeView && TM.getTargetTriple().isOSWindows()) {
313 Handlers.emplace_back(llvm::make_unique<CodeViewDebug>(this),
314 DbgTimerName, DbgTimerDescription,
315 CodeViewLineTablesGroupName,
316 CodeViewLineTablesGroupDescription);
317 }
318 if (!EmitCodeView || MMI->getModule()->getDwarfVersion()) {
319 DD = new DwarfDebug(this, &M);
320 DD->beginModule();
321 Handlers.emplace_back(std::unique_ptr<DwarfDebug>(DD), DbgTimerName,
322 DbgTimerDescription, DWARFGroupName,
323 DWARFGroupDescription);
324 }
325 }
326
327 switch (MAI->getExceptionHandlingType()) {
328 case ExceptionHandling::SjLj:
329 case ExceptionHandling::DwarfCFI:
330 case ExceptionHandling::ARM:
331 isCFIMoveForDebugging = true;
332 if (MAI->getExceptionHandlingType() != ExceptionHandling::DwarfCFI)
333 break;
334 for (auto &F: M.getFunctionList()) {
335 // If the module contains any function with unwind data,
336 // .eh_frame has to be emitted.
337 // Ignore functions that won't get emitted.
338 if (!F.isDeclarationForLinker() && F.needsUnwindTableEntry()) {
339 isCFIMoveForDebugging = false;
340 break;
341 }
342 }
343 break;
344 default:
345 isCFIMoveForDebugging = false;
346 break;
347 }
348
349 EHStreamer *ES = nullptr;
350 switch (MAI->getExceptionHandlingType()) {
351 case ExceptionHandling::None:
352 break;
353 case ExceptionHandling::SjLj:
354 case ExceptionHandling::DwarfCFI:
355 ES = new DwarfCFIException(this);
356 break;
357 case ExceptionHandling::ARM:
358 ES = new ARMException(this);
359 break;
360 case ExceptionHandling::WinEH:
361 switch (MAI->getWinEHEncodingType()) {
362 default: llvm_unreachable("unsupported unwinding information encoding")::llvm::llvm_unreachable_internal("unsupported unwinding information encoding"
, "/build/llvm-toolchain-snapshot-9~svn362543/lib/CodeGen/AsmPrinter/AsmPrinter.cpp"
, 362)
;
363 case WinEH::EncodingType::Invalid:
364 break;
365 case WinEH::EncodingType::X86:
366 case WinEH::EncodingType::Itanium:
367 ES = new WinException(this);
368 break;
369 }
370 break;
371 case ExceptionHandling::Wasm:
372 ES = new WasmException(this);
373 break;
374 }
375 if (ES)
376 Handlers.emplace_back(std::unique_ptr<EHStreamer>(ES), EHTimerName,
377 EHTimerDescription, DWARFGroupName,
378 DWARFGroupDescription);
379
380 if (mdconst::extract_or_null<ConstantInt>(
381 MMI->getModule()->getModuleFlag("cfguardtable")))
382 Handlers.emplace_back(llvm::make_unique<WinCFGuard>(this), CFGuardName,
383 CFGuardDescription, DWARFGroupName,
384 DWARFGroupDescription);
385
386 return false;
387}
388
389static bool canBeHidden(const GlobalValue *GV, const MCAsmInfo &MAI) {
390 if (!MAI.hasWeakDefCanBeHiddenDirective())
391 return false;
392
393 return GV->canBeOmittedFromSymbolTable();
394}
395
396void AsmPrinter::EmitLinkage(const GlobalValue *GV, MCSymbol *GVSym) const {
397 GlobalValue::LinkageTypes Linkage = GV->getLinkage();
398 switch (Linkage) {
399 case GlobalValue::CommonLinkage:
400 case GlobalValue::LinkOnceAnyLinkage:
401 case GlobalValue::LinkOnceODRLinkage:
402 case GlobalValue::WeakAnyLinkage:
403 case GlobalValue::WeakODRLinkage:
404 if (MAI->hasWeakDefDirective()) {
405 // .globl _foo
406 OutStreamer->EmitSymbolAttribute(GVSym, MCSA_Global);
407
408 if (!canBeHidden(GV, *MAI))
409 // .weak_definition _foo
410 OutStreamer->EmitSymbolAttribute(GVSym, MCSA_WeakDefinition);
411 else
412 OutStreamer->EmitSymbolAttribute(GVSym, MCSA_WeakDefAutoPrivate);
413 } else if (MAI->hasLinkOnceDirective()) {
414 // .globl _foo
415 OutStreamer->EmitSymbolAttribute(GVSym, MCSA_Global);
416 //NOTE: linkonce is handled by the section the symbol was assigned to.
417 } else {
418 // .weak _foo
419 OutStreamer->EmitSymbolAttribute(GVSym, MCSA_Weak);
420 }
421 return;
422 case GlobalValue::ExternalLinkage:
423 // If external, declare as a global symbol: .globl _foo
424 OutStreamer->EmitSymbolAttribute(GVSym, MCSA_Global);
425 return;
426 case GlobalValue::PrivateLinkage:
427 case GlobalValue::InternalLinkage:
428 return;
429 case GlobalValue::AppendingLinkage:
430 case GlobalValue::AvailableExternallyLinkage:
431 case GlobalValue::ExternalWeakLinkage:
432 llvm_unreachable("Should never emit this")::llvm::llvm_unreachable_internal("Should never emit this", "/build/llvm-toolchain-snapshot-9~svn362543/lib/CodeGen/AsmPrinter/AsmPrinter.cpp"
, 432)
;
433 }
434 llvm_unreachable("Unknown linkage type!")::llvm::llvm_unreachable_internal("Unknown linkage type!", "/build/llvm-toolchain-snapshot-9~svn362543/lib/CodeGen/AsmPrinter/AsmPrinter.cpp"
, 434)
;
435}
436
437void AsmPrinter::getNameWithPrefix(SmallVectorImpl<char> &Name,
438 const GlobalValue *GV) const {
439 TM.getNameWithPrefix(Name, GV, getObjFileLowering().getMangler());
440}
441
442MCSymbol *AsmPrinter::getSymbol(const GlobalValue *GV) const {
443 return TM.getSymbol(GV);
444}
445
446/// EmitGlobalVariable - Emit the specified global variable to the .s file.
447void AsmPrinter::EmitGlobalVariable(const GlobalVariable *GV) {
448 bool IsEmuTLSVar = TM.useEmulatedTLS() && GV->isThreadLocal();
2
Assuming the condition is false
449 assert(!(IsEmuTLSVar && GV->hasCommonLinkage()) &&((!(IsEmuTLSVar && GV->hasCommonLinkage()) &&
"No emulated TLS variables in the common section") ? static_cast
<void> (0) : __assert_fail ("!(IsEmuTLSVar && GV->hasCommonLinkage()) && \"No emulated TLS variables in the common section\""
, "/build/llvm-toolchain-snapshot-9~svn362543/lib/CodeGen/AsmPrinter/AsmPrinter.cpp"
, 450, __PRETTY_FUNCTION__))
3
'?' condition is true
450 "No emulated TLS variables in the common section")((!(IsEmuTLSVar && GV->hasCommonLinkage()) &&
"No emulated TLS variables in the common section") ? static_cast
<void> (0) : __assert_fail ("!(IsEmuTLSVar && GV->hasCommonLinkage()) && \"No emulated TLS variables in the common section\""
, "/build/llvm-toolchain-snapshot-9~svn362543/lib/CodeGen/AsmPrinter/AsmPrinter.cpp"
, 450, __PRETTY_FUNCTION__))
;
451
452 // Never emit TLS variable xyz in emulated TLS model.
453 // The initialization value is in __emutls_t.xyz instead of xyz.
454 if (IsEmuTLSVar)
4
Taking false branch
455 return;
456
457 if (GV->hasInitializer()) {
5
Taking false branch
458 // Check to see if this is a special global used by LLVM, if so, emit it.
459 if (EmitSpecialLLVMGlobal(GV))
460 return;
461
462 // Skip the emission of global equivalents. The symbol can be emitted later
463 // on by emitGlobalGOTEquivs in case it turns out to be needed.
464 if (GlobalGOTEquivs.count(getSymbol(GV)))
465 return;
466
467 if (isVerbose()) {
468 // When printing the control variable __emutls_v.*,
469 // we don't need to print the original TLS variable name.
470 GV->printAsOperand(OutStreamer->GetCommentOS(),
471 /*PrintType=*/false, GV->getParent());
472 OutStreamer->GetCommentOS() << '\n';
473 }
474 }
475
476 MCSymbol *GVSym = getSymbol(GV);
477 MCSymbol *EmittedSym = GVSym;
478
479 // getOrCreateEmuTLSControlSym only creates the symbol with name and default
480 // attributes.
481 // GV's or GVSym's attributes will be used for the EmittedSym.
482 EmitVisibility(EmittedSym, GV->getVisibility(), !GV->isDeclaration());
6
Assuming the condition is false
483
484 if (!GV->hasInitializer()) // External globals require no extra code.
7
Taking false branch
485 return;
486
487 GVSym->redefineIfPossible();
488 if (GVSym->isDefined() || GVSym->isVariable())
8
Taking false branch
489 report_fatal_error("symbol '" + Twine(GVSym->getName()) +
490 "' is already defined");
491
492 if (MAI->hasDotTypeDotSizeDirective())
9
Assuming the condition is false
10
Taking false branch
493 OutStreamer->EmitSymbolAttribute(EmittedSym, MCSA_ELF_TypeObject);
494
495 SectionKind GVKind = TargetLoweringObjectFile::getKindForGlobal(GV, TM);
496
497 const DataLayout &DL = GV->getParent()->getDataLayout();
498 uint64_t Size = DL.getTypeAllocSize(GV->getType()->getElementType());
499
500 // If the alignment is specified, we *must* obey it. Overaligning a global
501 // with a specified alignment is a prompt way to break globals emitted to
502 // sections and expected to be contiguous (e.g. ObjC metadata).
503 unsigned AlignLog = getGVAlignmentLog2(GV, DL);
504
505 for (const HandlerInfo &HI : Handlers) {
11
Assuming '__begin1' is equal to '__end1'
506 NamedRegionTimer T(HI.TimerName, HI.TimerDescription,
507 HI.TimerGroupName, HI.TimerGroupDescription,
508 TimePassesIsEnabled);
509 HI.Handler->setSymbolSize(GVSym, Size);
510 }
511
512 // Handle common symbols
513 if (GVKind.isCommon()) {
12
Taking false branch
514 if (Size == 0) Size = 1; // .comm Foo, 0 is undefined, avoid it.
515 unsigned Align = 1 << AlignLog;
516 if (!getObjFileLowering().getCommDirectiveSupportsAlignment())
517 Align = 0;
518
519 // .comm _foo, 42, 4
520 OutStreamer->EmitCommonSymbol(GVSym, Size, Align);
521 return;
522 }
523
524 // Determine to which section this global should be emitted.
525 MCSection *TheSection = getObjFileLowering().SectionForGlobal(GV, GVKind, TM);
526
527 // If we have a bss global going to a section that supports the
528 // zerofill directive, do so here.
529 if (GVKind.isBSS() && MAI->hasMachoZeroFillDirective() &&
530 TheSection->isVirtualSection()) {
531 if (Size == 0)
532 Size = 1; // zerofill of 0 bytes is undefined.
533 unsigned Align = 1 << AlignLog;
534 EmitLinkage(GV, GVSym);
535 // .zerofill __DATA, __bss, _foo, 400, 5
536 OutStreamer->EmitZerofill(TheSection, GVSym, Size, Align);
537 return;
538 }
539
540 // If this is a BSS local symbol and we are emitting in the BSS
541 // section use .lcomm/.comm directive.
542 if (GVKind.isBSSLocal() &&
543 getObjFileLowering().getBSSSection() == TheSection) {
544 if (Size == 0)
545 Size = 1; // .comm Foo, 0 is undefined, avoid it.
546 unsigned Align = 1 << AlignLog;
547
548 // Use .lcomm only if it supports user-specified alignment.
549 // Otherwise, while it would still be correct to use .lcomm in some
550 // cases (e.g. when Align == 1), the external assembler might enfore
551 // some -unknown- default alignment behavior, which could cause
552 // spurious differences between external and integrated assembler.
553 // Prefer to simply fall back to .local / .comm in this case.
554 if (MAI->getLCOMMDirectiveAlignmentType() != LCOMM::NoAlignment) {
555 // .lcomm _foo, 42
556 OutStreamer->EmitLocalCommonSymbol(GVSym, Size, Align);
557 return;
558 }
559
560 if (!getObjFileLowering().getCommDirectiveSupportsAlignment())
561 Align = 0;
562
563 // .local _foo
564 OutStreamer->EmitSymbolAttribute(GVSym, MCSA_Local);
565 // .comm _foo, 42, 4
566 OutStreamer->EmitCommonSymbol(GVSym, Size, Align);
567 return;
568 }
569
570 // Handle thread local data for mach-o which requires us to output an
571 // additional structure of data and mangle the original symbol so that we
572 // can reference it later.
573 //
574 // TODO: This should become an "emit thread local global" method on TLOF.
575 // All of this macho specific stuff should be sunk down into TLOFMachO and
576 // stuff like "TLSExtraDataSection" should no longer be part of the parent
577 // TLOF class. This will also make it more obvious that stuff like
578 // MCStreamer::EmitTBSSSymbol is macho specific and only called from macho
579 // specific code.
580 if (GVKind.isThreadLocal() && MAI->hasMachoTBSSDirective()) {
581 // Emit the .tbss symbol
582 MCSymbol *MangSym =
583 OutContext.getOrCreateSymbol(GVSym->getName() + Twine("$tlv$init"));
584
585 if (GVKind.isThreadBSS()) {
586 TheSection = getObjFileLowering().getTLSBSSSection();
587 OutStreamer->EmitTBSSSymbol(TheSection, MangSym, Size, 1 << AlignLog);
588 } else if (GVKind.isThreadData()) {
589 OutStreamer->SwitchSection(TheSection);
590
591 EmitAlignment(AlignLog, GV);
592 OutStreamer->EmitLabel(MangSym);
593
594 EmitGlobalConstant(GV->getParent()->getDataLayout(),
595 GV->getInitializer());
596 }
597
598 OutStreamer->AddBlankLine();
599
600 // Emit the variable struct for the runtime.
601 MCSection *TLVSect = getObjFileLowering().getTLSExtraDataSection();
602
603 OutStreamer->SwitchSection(TLVSect);
604 // Emit the linkage here.
605 EmitLinkage(GV, GVSym);
606 OutStreamer->EmitLabel(GVSym);
607
608 // Three pointers in size:
609 // - __tlv_bootstrap - used to make sure support exists
610 // - spare pointer, used when mapped by the runtime
611 // - pointer to mangled symbol above with initializer
612 unsigned PtrSize = DL.getPointerTypeSize(GV->getType());
613 OutStreamer->EmitSymbolValue(GetExternalSymbolSymbol("_tlv_bootstrap"),
614 PtrSize);
615 OutStreamer->EmitIntValue(0, PtrSize);
616 OutStreamer->EmitSymbolValue(MangSym, PtrSize);
617
618 OutStreamer->AddBlankLine();
619 return;
620 }
621
622 MCSymbol *EmittedInitSym = GVSym;
623
624 OutStreamer->SwitchSection(TheSection);
625
626 EmitLinkage(GV, EmittedInitSym);
627 EmitAlignment(AlignLog, GV);
628
629 OutStreamer->EmitLabel(EmittedInitSym);
630
631 EmitGlobalConstant(GV->getParent()->getDataLayout(), GV->getInitializer());
13
Calling 'AsmPrinter::EmitGlobalConstant'
632
633 if (MAI->hasDotTypeDotSizeDirective())
634 // .size foo, 42
635 OutStreamer->emitELFSize(EmittedInitSym,
636 MCConstantExpr::create(Size, OutContext));
637
638 OutStreamer->AddBlankLine();
639}
640
641/// Emit the directive and value for debug thread local expression
642///
643/// \p Value - The value to emit.
644/// \p Size - The size of the integer (in bytes) to emit.
645void AsmPrinter::EmitDebugValue(const MCExpr *Value, unsigned Size) const {
646 OutStreamer->EmitValue(Value, Size);
647}
648
649/// EmitFunctionHeader - This method emits the header for the current
650/// function.
651void AsmPrinter::EmitFunctionHeader() {
652 const Function &F = MF->getFunction();
653
654 if (isVerbose())
655 OutStreamer->GetCommentOS()
656 << "-- Begin function "
657 << GlobalValue::dropLLVMManglingEscape(F.getName()) << '\n';
658
659 // Print out constants referenced by the function
660 EmitConstantPool();
661
662 // Print the 'header' of function.
663 OutStreamer->SwitchSection(getObjFileLowering().SectionForGlobal(&F, TM));
664 EmitVisibility(CurrentFnSym, F.getVisibility());
665
666 EmitLinkage(&F, CurrentFnSym);
667 if (MAI->hasFunctionAlignment())
668 EmitAlignment(MF->getAlignment(), &F);
669
670 if (MAI->hasDotTypeDotSizeDirective())
671 OutStreamer->EmitSymbolAttribute(CurrentFnSym, MCSA_ELF_TypeFunction);
672
673 if (F.hasFnAttribute(Attribute::Cold))
674 OutStreamer->EmitSymbolAttribute(CurrentFnSym, MCSA_Cold);
675
676 if (isVerbose()) {
677 F.printAsOperand(OutStreamer->GetCommentOS(),
678 /*PrintType=*/false, F.getParent());
679 OutStreamer->GetCommentOS() << '\n';
680 }
681
682 // Emit the prefix data.
683 if (F.hasPrefixData()) {
684 if (MAI->hasSubsectionsViaSymbols()) {
685 // Preserving prefix data on platforms which use subsections-via-symbols
686 // is a bit tricky. Here we introduce a symbol for the prefix data
687 // and use the .alt_entry attribute to mark the function's real entry point
688 // as an alternative entry point to the prefix-data symbol.
689 MCSymbol *PrefixSym = OutContext.createLinkerPrivateTempSymbol();
690 OutStreamer->EmitLabel(PrefixSym);
691
692 EmitGlobalConstant(F.getParent()->getDataLayout(), F.getPrefixData());
693
694 // Emit an .alt_entry directive for the actual function symbol.
695 OutStreamer->EmitSymbolAttribute(CurrentFnSym, MCSA_AltEntry);
696 } else {
697 EmitGlobalConstant(F.getParent()->getDataLayout(), F.getPrefixData());
698 }
699 }
700
701 // Emit the CurrentFnSym. This is a virtual function to allow targets to
702 // do their wild and crazy things as required.
703 EmitFunctionEntryLabel();
704
705 // If the function had address-taken blocks that got deleted, then we have
706 // references to the dangling symbols. Emit them at the start of the function
707 // so that we don't get references to undefined symbols.
708 std::vector<MCSymbol*> DeadBlockSyms;
709 MMI->takeDeletedSymbolsForFunction(&F, DeadBlockSyms);
710 for (unsigned i = 0, e = DeadBlockSyms.size(); i != e; ++i) {
711 OutStreamer->AddComment("Address taken block that was later removed");
712 OutStreamer->EmitLabel(DeadBlockSyms[i]);
713 }
714
715 if (CurrentFnBegin) {
716 if (MAI->useAssignmentForEHBegin()) {
717 MCSymbol *CurPos = OutContext.createTempSymbol();
718 OutStreamer->EmitLabel(CurPos);
719 OutStreamer->EmitAssignment(CurrentFnBegin,
720 MCSymbolRefExpr::create(CurPos, OutContext));
721 } else {
722 OutStreamer->EmitLabel(CurrentFnBegin);
723 }
724 }
725
726 // Emit pre-function debug and/or EH information.
727 for (const HandlerInfo &HI : Handlers) {
728 NamedRegionTimer T(HI.TimerName, HI.TimerDescription, HI.TimerGroupName,
729 HI.TimerGroupDescription, TimePassesIsEnabled);
730 HI.Handler->beginFunction(MF);
731 }
732
733 // Emit the prologue data.
734 if (F.hasPrologueData())
735 EmitGlobalConstant(F.getParent()->getDataLayout(), F.getPrologueData());
736}
737
738/// EmitFunctionEntryLabel - Emit the label that is the entrypoint for the
739/// function. This can be overridden by targets as required to do custom stuff.
740void AsmPrinter::EmitFunctionEntryLabel() {
741 CurrentFnSym->redefineIfPossible();
742
743 // The function label could have already been emitted if two symbols end up
744 // conflicting due to asm renaming. Detect this and emit an error.
745 if (CurrentFnSym->isVariable())
746 report_fatal_error("'" + Twine(CurrentFnSym->getName()) +
747 "' is a protected alias");
748 if (CurrentFnSym->isDefined())
749 report_fatal_error("'" + Twine(CurrentFnSym->getName()) +
750 "' label emitted multiple times to assembly file");
751
752 return OutStreamer->EmitLabel(CurrentFnSym);
753}
754
755/// emitComments - Pretty-print comments for instructions.
756static void emitComments(const MachineInstr &MI, raw_ostream &CommentOS) {
757 const MachineFunction *MF = MI.getMF();
758 const TargetInstrInfo *TII = MF->getSubtarget().getInstrInfo();
759
760 // Check for spills and reloads
761
762 // We assume a single instruction only has a spill or reload, not
763 // both.
764 Optional<unsigned> Size;
765 if ((Size = MI.getRestoreSize(TII))) {
766 CommentOS << *Size << "-byte Reload\n";
767 } else if ((Size = MI.getFoldedRestoreSize(TII))) {
768 if (*Size)
769 CommentOS << *Size << "-byte Folded Reload\n";
770 } else if ((Size = MI.getSpillSize(TII))) {
771 CommentOS << *Size << "-byte Spill\n";
772 } else if ((Size = MI.getFoldedSpillSize(TII))) {
773 if (*Size)
774 CommentOS << *Size << "-byte Folded Spill\n";
775 }
776
777 // Check for spill-induced copies
778 if (MI.getAsmPrinterFlag(MachineInstr::ReloadReuse))
779 CommentOS << " Reload Reuse\n";
780}
781
782/// emitImplicitDef - This method emits the specified machine instruction
783/// that is an implicit def.
784void AsmPrinter::emitImplicitDef(const MachineInstr *MI) const {
785 unsigned RegNo = MI->getOperand(0).getReg();
786
787 SmallString<128> Str;
788 raw_svector_ostream OS(Str);
789 OS << "implicit-def: "
790 << printReg(RegNo, MF->getSubtarget().getRegisterInfo());
791
792 OutStreamer->AddComment(OS.str());
793 OutStreamer->AddBlankLine();
794}
795
796static void emitKill(const MachineInstr *MI, AsmPrinter &AP) {
797 std::string Str;
798 raw_string_ostream OS(Str);
799 OS << "kill:";
800 for (unsigned i = 0, e = MI->getNumOperands(); i != e; ++i) {
801 const MachineOperand &Op = MI->getOperand(i);
802 assert(Op.isReg() && "KILL instruction must have only register operands")((Op.isReg() && "KILL instruction must have only register operands"
) ? static_cast<void> (0) : __assert_fail ("Op.isReg() && \"KILL instruction must have only register operands\""
, "/build/llvm-toolchain-snapshot-9~svn362543/lib/CodeGen/AsmPrinter/AsmPrinter.cpp"
, 802, __PRETTY_FUNCTION__))
;
803 OS << ' ' << (Op.isDef() ? "def " : "killed ")
804 << printReg(Op.getReg(), AP.MF->getSubtarget().getRegisterInfo());
805 }
806 AP.OutStreamer->AddComment(OS.str());
807 AP.OutStreamer->AddBlankLine();
808}
809
810/// emitDebugValueComment - This method handles the target-independent form
811/// of DBG_VALUE, returning true if it was able to do so. A false return
812/// means the target will need to handle MI in EmitInstruction.
813static bool emitDebugValueComment(const MachineInstr *MI, AsmPrinter &AP) {
814 // This code handles only the 4-operand target-independent form.
815 if (MI->getNumOperands() != 4)
816 return false;
817
818 SmallString<128> Str;
819 raw_svector_ostream OS(Str);
820 OS << "DEBUG_VALUE: ";
821
822 const DILocalVariable *V = MI->getDebugVariable();
823 if (auto *SP = dyn_cast<DISubprogram>(V->getScope())) {
824 StringRef Name = SP->getName();
825 if (!Name.empty())
826 OS << Name << ":";
827 }
828 OS << V->getName();
829 OS << " <- ";
830
831 // The second operand is only an offset if it's an immediate.
832 bool MemLoc = MI->getOperand(0).isReg() && MI->getOperand(1).isImm();
833 int64_t Offset = MemLoc ? MI->getOperand(1).getImm() : 0;
834 const DIExpression *Expr = MI->getDebugExpression();
835 if (Expr->getNumElements()) {
836 OS << '[';
837 bool NeedSep = false;
838 for (auto Op : Expr->expr_ops()) {
839 if (NeedSep)
840 OS << ", ";
841 else
842 NeedSep = true;
843 OS << dwarf::OperationEncodingString(Op.getOp());
844 for (unsigned I = 0; I < Op.getNumArgs(); ++I)
845 OS << ' ' << Op.getArg(I);
846 }
847 OS << "] ";
848 }
849
850 // Register or immediate value. Register 0 means undef.
851 if (MI->getOperand(0).isFPImm()) {
852 APFloat APF = APFloat(MI->getOperand(0).getFPImm()->getValueAPF());
853 if (MI->getOperand(0).getFPImm()->getType()->isFloatTy()) {
854 OS << (double)APF.convertToFloat();
855 } else if (MI->getOperand(0).getFPImm()->getType()->isDoubleTy()) {
856 OS << APF.convertToDouble();
857 } else {
858 // There is no good way to print long double. Convert a copy to
859 // double. Ah well, it's only a comment.
860 bool ignored;
861 APF.convert(APFloat::IEEEdouble(), APFloat::rmNearestTiesToEven,
862 &ignored);
863 OS << "(long double) " << APF.convertToDouble();
864 }
865 } else if (MI->getOperand(0).isImm()) {
866 OS << MI->getOperand(0).getImm();
867 } else if (MI->getOperand(0).isCImm()) {
868 MI->getOperand(0).getCImm()->getValue().print(OS, false /*isSigned*/);
869 } else {
870 unsigned Reg;
871 if (MI->getOperand(0).isReg()) {
872 Reg = MI->getOperand(0).getReg();
873 } else {
874 assert(MI->getOperand(0).isFI() && "Unknown operand type")((MI->getOperand(0).isFI() && "Unknown operand type"
) ? static_cast<void> (0) : __assert_fail ("MI->getOperand(0).isFI() && \"Unknown operand type\""
, "/build/llvm-toolchain-snapshot-9~svn362543/lib/CodeGen/AsmPrinter/AsmPrinter.cpp"
, 874, __PRETTY_FUNCTION__))
;
875 const TargetFrameLowering *TFI = AP.MF->getSubtarget().getFrameLowering();
876 Offset += TFI->getFrameIndexReference(*AP.MF,
877 MI->getOperand(0).getIndex(), Reg);
878 MemLoc = true;
879 }
880 if (Reg == 0) {
881 // Suppress offset, it is not meaningful here.
882 OS << "undef";
883 // NOTE: Want this comment at start of line, don't emit with AddComment.
884 AP.OutStreamer->emitRawComment(OS.str());
885 return true;
886 }
887 if (MemLoc)
888 OS << '[';
889 OS << printReg(Reg, AP.MF->getSubtarget().getRegisterInfo());
890 }
891
892 if (MemLoc)
893 OS << '+' << Offset << ']';
894
895 // NOTE: Want this comment at start of line, don't emit with AddComment.
896 AP.OutStreamer->emitRawComment(OS.str());
897 return true;
898}
899
900/// This method handles the target-independent form of DBG_LABEL, returning
901/// true if it was able to do so. A false return means the target will need
902/// to handle MI in EmitInstruction.
903static bool emitDebugLabelComment(const MachineInstr *MI, AsmPrinter &AP) {
904 if (MI->getNumOperands() != 1)
905 return false;
906
907 SmallString<128> Str;
908 raw_svector_ostream OS(Str);
909 OS << "DEBUG_LABEL: ";
910
911 const DILabel *V = MI->getDebugLabel();
912 if (auto *SP = dyn_cast<DISubprogram>(V->getScope())) {
913 StringRef Name = SP->getName();
914 if (!Name.empty())
915 OS << Name << ":";
916 }
917 OS << V->getName();
918
919 // NOTE: Want this comment at start of line, don't emit with AddComment.
920 AP.OutStreamer->emitRawComment(OS.str());
921 return true;
922}
923
924AsmPrinter::CFIMoveType AsmPrinter::needsCFIMoves() const {
925 if (MAI->getExceptionHandlingType() == ExceptionHandling::DwarfCFI &&
926 MF->getFunction().needsUnwindTableEntry())
927 return CFI_M_EH;
928
929 if (MMI->hasDebugInfo())
930 return CFI_M_Debug;
931
932 return CFI_M_None;
933}
934
935bool AsmPrinter::needsSEHMoves() {
936 return MAI->usesWindowsCFI() && MF->getFunction().needsUnwindTableEntry();
937}
938
939void AsmPrinter::emitCFIInstruction(const MachineInstr &MI) {
940 ExceptionHandling ExceptionHandlingType = MAI->getExceptionHandlingType();
941 if (ExceptionHandlingType != ExceptionHandling::DwarfCFI &&
942 ExceptionHandlingType != ExceptionHandling::ARM)
943 return;
944
945 if (needsCFIMoves() == CFI_M_None)
946 return;
947
948 // If there is no "real" instruction following this CFI instruction, skip
949 // emitting it; it would be beyond the end of the function's FDE range.
950 auto *MBB = MI.getParent();
951 auto I = std::next(MI.getIterator());
952 while (I != MBB->end() && I->isTransient())
953 ++I;
954 if (I == MBB->instr_end() &&
955 MBB->getReverseIterator() == MBB->getParent()->rbegin())
956 return;
957
958 const std::vector<MCCFIInstruction> &Instrs = MF->getFrameInstructions();
959 unsigned CFIIndex = MI.getOperand(0).getCFIIndex();
960 const MCCFIInstruction &CFI = Instrs[CFIIndex];
961 emitCFIInstruction(CFI);
962}
963
964void AsmPrinter::emitFrameAlloc(const MachineInstr &MI) {
965 // The operands are the MCSymbol and the frame offset of the allocation.
966 MCSymbol *FrameAllocSym = MI.getOperand(0).getMCSymbol();
967 int FrameOffset = MI.getOperand(1).getImm();
968
969 // Emit a symbol assignment.
970 OutStreamer->EmitAssignment(FrameAllocSym,
971 MCConstantExpr::create(FrameOffset, OutContext));
972}
973
974void AsmPrinter::emitStackSizeSection(const MachineFunction &MF) {
975 if (!MF.getTarget().Options.EmitStackSizeSection)
976 return;
977
978 MCSection *StackSizeSection =
979 getObjFileLowering().getStackSizesSection(*getCurrentSection());
980 if (!StackSizeSection)
981 return;
982
983 const MachineFrameInfo &FrameInfo = MF.getFrameInfo();
984 // Don't emit functions with dynamic stack allocations.
985 if (FrameInfo.hasVarSizedObjects())
986 return;
987
988 OutStreamer->PushSection();
989 OutStreamer->SwitchSection(StackSizeSection);
990
991 const MCSymbol *FunctionSymbol = getFunctionBegin();
992 uint64_t StackSize = FrameInfo.getStackSize();
993 OutStreamer->EmitSymbolValue(FunctionSymbol, TM.getProgramPointerSize());
994 OutStreamer->EmitULEB128IntValue(StackSize);
995
996 OutStreamer->PopSection();
997}
998
999static bool needFuncLabelsForEHOrDebugInfo(const MachineFunction &MF,
1000 MachineModuleInfo *MMI) {
1001 if (!MF.getLandingPads().empty() || MF.hasEHFunclets() || MMI->hasDebugInfo())
1002 return true;
1003
1004 // We might emit an EH table that uses function begin and end labels even if
1005 // we don't have any landingpads.
1006 if (!MF.getFunction().hasPersonalityFn())
1007 return false;
1008 return !isNoOpWithoutInvoke(
1009 classifyEHPersonality(MF.getFunction().getPersonalityFn()));
1010}
1011
1012/// EmitFunctionBody - This method emits the body and trailer for a
1013/// function.
1014void AsmPrinter::EmitFunctionBody() {
1015 EmitFunctionHeader();
1016
1017 // Emit target-specific gunk before the function body.
1018 EmitFunctionBodyStart();
1019
1020 bool ShouldPrintDebugScopes = MMI->hasDebugInfo();
1021
1022 if (isVerbose()) {
1023 // Get MachineDominatorTree or compute it on the fly if it's unavailable
1024 MDT = getAnalysisIfAvailable<MachineDominatorTree>();
1025 if (!MDT) {
1026 OwnedMDT = make_unique<MachineDominatorTree>();
1027 OwnedMDT->getBase().recalculate(*MF);
1028 MDT = OwnedMDT.get();
1029 }
1030
1031 // Get MachineLoopInfo or compute it on the fly if it's unavailable
1032 MLI = getAnalysisIfAvailable<MachineLoopInfo>();
1033 if (!MLI) {
1034 OwnedMLI = make_unique<MachineLoopInfo>();
1035 OwnedMLI->getBase().analyze(MDT->getBase());
1036 MLI = OwnedMLI.get();
1037 }
1038 }
1039
1040 // Print out code for the function.
1041 bool HasAnyRealCode = false;
1042 int NumInstsInFunction = 0;
1043 for (auto &MBB : *MF) {
1044 // Print a label for the basic block.
1045 EmitBasicBlockStart(MBB);
1046 for (auto &MI : MBB) {
1047 // Print the assembly for the instruction.
1048 if (!MI.isPosition() && !MI.isImplicitDef() && !MI.isKill() &&
1049 !MI.isDebugInstr()) {
1050 HasAnyRealCode = true;
1051 ++NumInstsInFunction;
1052 }
1053
1054 // If there is a pre-instruction symbol, emit a label for it here.
1055 if (MCSymbol *S = MI.getPreInstrSymbol())
1056 OutStreamer->EmitLabel(S);
1057
1058 if (ShouldPrintDebugScopes) {
1059 for (const HandlerInfo &HI : Handlers) {
1060 NamedRegionTimer T(HI.TimerName, HI.TimerDescription,
1061 HI.TimerGroupName, HI.TimerGroupDescription,
1062 TimePassesIsEnabled);
1063 HI.Handler->beginInstruction(&MI);
1064 }
1065 }
1066
1067 if (isVerbose())
1068 emitComments(MI, OutStreamer->GetCommentOS());
1069
1070 switch (MI.getOpcode()) {
1071 case TargetOpcode::CFI_INSTRUCTION:
1072 emitCFIInstruction(MI);
1073 break;
1074 case TargetOpcode::LOCAL_ESCAPE:
1075 emitFrameAlloc(MI);
1076 break;
1077 case TargetOpcode::ANNOTATION_LABEL:
1078 case TargetOpcode::EH_LABEL:
1079 case TargetOpcode::GC_LABEL:
1080 OutStreamer->EmitLabel(MI.getOperand(0).getMCSymbol());
1081 break;
1082 case TargetOpcode::INLINEASM:
1083 case TargetOpcode::INLINEASM_BR:
1084 EmitInlineAsm(&MI);
1085 break;
1086 case TargetOpcode::DBG_VALUE:
1087 if (isVerbose()) {
1088 if (!emitDebugValueComment(&MI, *this))
1089 EmitInstruction(&MI);
1090 }
1091 break;
1092 case TargetOpcode::DBG_LABEL:
1093 if (isVerbose()) {
1094 if (!emitDebugLabelComment(&MI, *this))
1095 EmitInstruction(&MI);
1096 }
1097 break;
1098 case TargetOpcode::IMPLICIT_DEF:
1099 if (isVerbose()) emitImplicitDef(&MI);
1100 break;
1101 case TargetOpcode::KILL:
1102 if (isVerbose()) emitKill(&MI, *this);
1103 break;
1104 default:
1105 EmitInstruction(&MI);
1106 break;
1107 }
1108
1109 // If there is a post-instruction symbol, emit a label for it here.
1110 if (MCSymbol *S = MI.getPostInstrSymbol())
1111 OutStreamer->EmitLabel(S);
1112
1113 if (ShouldPrintDebugScopes) {
1114 for (const HandlerInfo &HI : Handlers) {
1115 NamedRegionTimer T(HI.TimerName, HI.TimerDescription,
1116 HI.TimerGroupName, HI.TimerGroupDescription,
1117 TimePassesIsEnabled);
1118 HI.Handler->endInstruction();
1119 }
1120 }
1121 }
1122
1123 EmitBasicBlockEnd(MBB);
1124 }
1125
1126 EmittedInsts += NumInstsInFunction;
1127 MachineOptimizationRemarkAnalysis R(DEBUG_TYPE"asm-printer", "InstructionCount",
1128 MF->getFunction().getSubprogram(),
1129 &MF->front());
1130 R << ore::NV("NumInstructions", NumInstsInFunction)
1131 << " instructions in function";
1132 ORE->emit(R);
1133
1134 // If the function is empty and the object file uses .subsections_via_symbols,
1135 // then we need to emit *something* to the function body to prevent the
1136 // labels from collapsing together. Just emit a noop.
1137 // Similarly, don't emit empty functions on Windows either. It can lead to
1138 // duplicate entries (two functions with the same RVA) in the Guard CF Table
1139 // after linking, causing the kernel not to load the binary:
1140 // https://developercommunity.visualstudio.com/content/problem/45366/vc-linker-creates-invalid-dll-with-clang-cl.html
1141 // FIXME: Hide this behind some API in e.g. MCAsmInfo or MCTargetStreamer.
1142 const Triple &TT = TM.getTargetTriple();
1143 if (!HasAnyRealCode && (MAI->hasSubsectionsViaSymbols() ||
1144 (TT.isOSWindows() && TT.isOSBinFormatCOFF()))) {
1145 MCInst Noop;
1146 MF->getSubtarget().getInstrInfo()->getNoop(Noop);
1147
1148 // Targets can opt-out of emitting the noop here by leaving the opcode
1149 // unspecified.
1150 if (Noop.getOpcode()) {
1151 OutStreamer->AddComment("avoids zero-length function");
1152 OutStreamer->EmitInstruction(Noop, getSubtargetInfo());
1153 }
1154 }
1155
1156 const Function &F = MF->getFunction();
1157 for (const auto &BB : F) {
1158 if (!BB.hasAddressTaken())
1159 continue;
1160 MCSymbol *Sym = GetBlockAddressSymbol(&BB);
1161 if (Sym->isDefined())
1162 continue;
1163 OutStreamer->AddComment("Address of block that was removed by CodeGen");
1164 OutStreamer->EmitLabel(Sym);
1165 }
1166
1167 // Emit target-specific gunk after the function body.
1168 EmitFunctionBodyEnd();
1169
1170 if (needFuncLabelsForEHOrDebugInfo(*MF, MMI) ||
1171 MAI->hasDotTypeDotSizeDirective()) {
1172 // Create a symbol for the end of function.
1173 CurrentFnEnd = createTempSymbol("func_end");
1174 OutStreamer->EmitLabel(CurrentFnEnd);
1175 }
1176
1177 // If the target wants a .size directive for the size of the function, emit
1178 // it.
1179 if (MAI->hasDotTypeDotSizeDirective()) {
1180 // We can get the size as difference between the function label and the
1181 // temp label.
1182 const MCExpr *SizeExp = MCBinaryExpr::createSub(
1183 MCSymbolRefExpr::create(CurrentFnEnd, OutContext),
1184 MCSymbolRefExpr::create(CurrentFnSymForSize, OutContext), OutContext);
1185 OutStreamer->emitELFSize(CurrentFnSym, SizeExp);
1186 }
1187
1188 for (const HandlerInfo &HI : Handlers) {
1189 NamedRegionTimer T(HI.TimerName, HI.TimerDescription, HI.TimerGroupName,
1190 HI.TimerGroupDescription, TimePassesIsEnabled);
1191 HI.Handler->markFunctionEnd();
1192 }
1193
1194 // Print out jump tables referenced by the function.
1195 EmitJumpTableInfo();
1196
1197 // Emit post-function debug and/or EH information.
1198 for (const HandlerInfo &HI : Handlers) {
1199 NamedRegionTimer T(HI.TimerName, HI.TimerDescription, HI.TimerGroupName,
1200 HI.TimerGroupDescription, TimePassesIsEnabled);
1201 HI.Handler->endFunction(MF);
1202 }
1203
1204 // Emit section containing stack size metadata.
1205 emitStackSizeSection(*MF);
1206
1207 if (isVerbose())
1208 OutStreamer->GetCommentOS() << "-- End function\n";
1209
1210 OutStreamer->AddBlankLine();
1211}
1212
1213/// Compute the number of Global Variables that uses a Constant.
1214static unsigned getNumGlobalVariableUses(const Constant *C) {
1215 if (!C)
1216 return 0;
1217
1218 if (isa<GlobalVariable>(C))
1219 return 1;
1220
1221 unsigned NumUses = 0;
1222 for (auto *CU : C->users())
1223 NumUses += getNumGlobalVariableUses(dyn_cast<Constant>(CU));
1224
1225 return NumUses;
1226}
1227
1228/// Only consider global GOT equivalents if at least one user is a
1229/// cstexpr inside an initializer of another global variables. Also, don't
1230/// handle cstexpr inside instructions. During global variable emission,
1231/// candidates are skipped and are emitted later in case at least one cstexpr
1232/// isn't replaced by a PC relative GOT entry access.
1233static bool isGOTEquivalentCandidate(const GlobalVariable *GV,
1234 unsigned &NumGOTEquivUsers) {
1235 // Global GOT equivalents are unnamed private globals with a constant
1236 // pointer initializer to another global symbol. They must point to a
1237 // GlobalVariable or Function, i.e., as GlobalValue.
1238 if (!GV->hasGlobalUnnamedAddr() || !GV->hasInitializer() ||
1239 !GV->isConstant() || !GV->isDiscardableIfUnused() ||
1240 !isa<GlobalValue>(GV->getOperand(0)))
1241 return false;
1242
1243 // To be a got equivalent, at least one of its users need to be a constant
1244 // expression used by another global variable.
1245 for (auto *U : GV->users())
1246 NumGOTEquivUsers += getNumGlobalVariableUses(dyn_cast<Constant>(U));
1247
1248 return NumGOTEquivUsers > 0;
1249}
1250
1251/// Unnamed constant global variables solely contaning a pointer to
1252/// another globals variable is equivalent to a GOT table entry; it contains the
1253/// the address of another symbol. Optimize it and replace accesses to these
1254/// "GOT equivalents" by using the GOT entry for the final global instead.
1255/// Compute GOT equivalent candidates among all global variables to avoid
1256/// emitting them if possible later on, after it use is replaced by a GOT entry
1257/// access.
1258void AsmPrinter::computeGlobalGOTEquivs(Module &M) {
1259 if (!getObjFileLowering().supportIndirectSymViaGOTPCRel())
1260 return;
1261
1262 for (const auto &G : M.globals()) {
1263 unsigned NumGOTEquivUsers = 0;
1264 if (!isGOTEquivalentCandidate(&G, NumGOTEquivUsers))
1265 continue;
1266
1267 const MCSymbol *GOTEquivSym = getSymbol(&G);
1268 GlobalGOTEquivs[GOTEquivSym] = std::make_pair(&G, NumGOTEquivUsers);
1269 }
1270}
1271
1272/// Constant expressions using GOT equivalent globals may not be eligible
1273/// for PC relative GOT entry conversion, in such cases we need to emit such
1274/// globals we previously omitted in EmitGlobalVariable.
1275void AsmPrinter::emitGlobalGOTEquivs() {
1276 if (!getObjFileLowering().supportIndirectSymViaGOTPCRel())
1277 return;
1278
1279 SmallVector<const GlobalVariable *, 8> FailedCandidates;
1280 for (auto &I : GlobalGOTEquivs) {
1281 const GlobalVariable *GV = I.second.first;
1282 unsigned Cnt = I.second.second;
1283 if (Cnt)
1284 FailedCandidates.push_back(GV);
1285 }
1286 GlobalGOTEquivs.clear();
1287
1288 for (auto *GV : FailedCandidates)
1289 EmitGlobalVariable(GV);
1290}
1291
1292void AsmPrinter::emitGlobalIndirectSymbol(Module &M,
1293 const GlobalIndirectSymbol& GIS) {
1294 MCSymbol *Name = getSymbol(&GIS);
1295
1296 if (GIS.hasExternalLinkage() || !MAI->getWeakRefDirective())
1297 OutStreamer->EmitSymbolAttribute(Name, MCSA_Global);
1298 else if (GIS.hasWeakLinkage() || GIS.hasLinkOnceLinkage())
1299 OutStreamer->EmitSymbolAttribute(Name, MCSA_WeakReference);
1300 else
1301 assert(GIS.hasLocalLinkage() && "Invalid alias or ifunc linkage")((GIS.hasLocalLinkage() && "Invalid alias or ifunc linkage"
) ? static_cast<void> (0) : __assert_fail ("GIS.hasLocalLinkage() && \"Invalid alias or ifunc linkage\""
, "/build/llvm-toolchain-snapshot-9~svn362543/lib/CodeGen/AsmPrinter/AsmPrinter.cpp"
, 1301, __PRETTY_FUNCTION__))
;
1302
1303 bool IsFunction = GIS.getType()->getPointerElementType()->isFunctionTy();
1304
1305 // Treat bitcasts of functions as functions also. This is important at least
1306 // on WebAssembly where object and function addresses can't alias each other.
1307 if (!IsFunction)
1308 if (auto *CE = dyn_cast<ConstantExpr>(GIS.getIndirectSymbol()))
1309 if (CE->getOpcode() == Instruction::BitCast)
1310 IsFunction =
1311 CE->getOperand(0)->getType()->getPointerElementType()->isFunctionTy();
1312
1313 // Set the symbol type to function if the alias has a function type.
1314 // This affects codegen when the aliasee is not a function.
1315 if (IsFunction) {
1316 OutStreamer->EmitSymbolAttribute(Name, MCSA_ELF_TypeFunction);
1317 if (isa<GlobalIFunc>(GIS))
1318 OutStreamer->EmitSymbolAttribute(Name, MCSA_ELF_TypeIndFunction);
1319 }
1320
1321 EmitVisibility(Name, GIS.getVisibility());
1322
1323 const MCExpr *Expr = lowerConstant(GIS.getIndirectSymbol());
1324
1325 if (isa<GlobalAlias>(&GIS) && MAI->hasAltEntry() && isa<MCBinaryExpr>(Expr))
1326 OutStreamer->EmitSymbolAttribute(Name, MCSA_AltEntry);
1327
1328 // Emit the directives as assignments aka .set:
1329 OutStreamer->EmitAssignment(Name, Expr);
1330
1331 if (auto *GA = dyn_cast<GlobalAlias>(&GIS)) {
1332 // If the aliasee does not correspond to a symbol in the output, i.e. the
1333 // alias is not of an object or the aliased object is private, then set the
1334 // size of the alias symbol from the type of the alias. We don't do this in
1335 // other situations as the alias and aliasee having differing types but same
1336 // size may be intentional.
1337 const GlobalObject *BaseObject = GA->getBaseObject();
1338 if (MAI->hasDotTypeDotSizeDirective() && GA->getValueType()->isSized() &&
1339 (!BaseObject || BaseObject->hasPrivateLinkage())) {
1340 const DataLayout &DL = M.getDataLayout();
1341 uint64_t Size = DL.getTypeAllocSize(GA->getValueType());
1342 OutStreamer->emitELFSize(Name, MCConstantExpr::create(Size, OutContext));
1343 }
1344 }
1345}
1346
1347void AsmPrinter::emitRemarksSection(Module &M) {
1348 RemarkStreamer *RS = M.getContext().getRemarkStreamer();
1349 if (!RS)
1350 return;
1351 const remarks::Serializer &Serializer = RS->getSerializer();
1352
1353 // Switch to the right section: .remarks/__remarks.
1354 MCSection *RemarksSection =
1355 OutContext.getObjectFileInfo()->getRemarksSection();
1356 OutStreamer->SwitchSection(RemarksSection);
1357
1358 // Emit the magic number.
1359 OutStreamer->EmitBytes(remarks::Magic);
1360 // Explicitly emit a '\0'.
1361 OutStreamer->EmitIntValue(/*Value=*/0, /*Size=*/1);
1362
1363 // Emit the version number: little-endian uint64_t.
1364 // The version number is located at the offset 0x0 in the section.
1365 std::array<char, 8> Version;
1366 support::endian::write64le(Version.data(), remarks::Version);
1367 OutStreamer->EmitBinaryData(StringRef(Version.data(), Version.size()));
1368
1369 // Emit the string table in the section.
1370 // Note: we need to use the streamer here to emit it in the section. We can't
1371 // just use the serialize function with a raw_ostream because of the way
1372 // MCStreamers work.
1373 uint64_t StrTabSize =
1374 Serializer.StrTab ? Serializer.StrTab->SerializedSize : 0;
1375 // Emit the total size of the string table (the size itself excluded):
1376 // little-endian uint64_t.
1377 // The total size is located after the version number.
1378 // Note: even if no string table is used, emit 0.
1379 std::array<char, 8> StrTabSizeBuf;
1380 support::endian::write64le(StrTabSizeBuf.data(), StrTabSize);
1381 OutStreamer->EmitBinaryData(
1382 StringRef(StrTabSizeBuf.data(), StrTabSizeBuf.size()));
1383
1384 if (const Optional<remarks::StringTable> &StrTab = Serializer.StrTab) {
1385 std::vector<StringRef> StrTabStrings = StrTab->serialize();
1386 // Emit a list of null-terminated strings.
1387 // Note: the order is important here: the ID used in the remarks corresponds
1388 // to the position of the string in the section.
1389 for (StringRef Str : StrTabStrings) {
1390 OutStreamer->EmitBytes(Str);
1391 // Explicitly emit a '\0'.
1392 OutStreamer->EmitIntValue(/*Value=*/0, /*Size=*/1);
1393 }
1394 }
1395
1396 // Emit the null-terminated absolute path to the remark file.
1397 // The path is located at the offset 0x4 in the section.
1398 StringRef FilenameRef = RS->getFilename();
1399 SmallString<128> Filename = FilenameRef;
1400 sys::fs::make_absolute(Filename);
1401 assert(!Filename.empty() && "The filename can't be empty.")((!Filename.empty() && "The filename can't be empty."
) ? static_cast<void> (0) : __assert_fail ("!Filename.empty() && \"The filename can't be empty.\""
, "/build/llvm-toolchain-snapshot-9~svn362543/lib/CodeGen/AsmPrinter/AsmPrinter.cpp"
, 1401, __PRETTY_FUNCTION__))
;
1402 OutStreamer->EmitBytes(Filename);
1403 // Explicitly emit a '\0'.
1404 OutStreamer->EmitIntValue(/*Value=*/0, /*Size=*/1);
1405}
1406
1407bool AsmPrinter::doFinalization(Module &M) {
1408 // Set the MachineFunction to nullptr so that we can catch attempted
1409 // accesses to MF specific features at the module level and so that
1410 // we can conditionalize accesses based on whether or not it is nullptr.
1411 MF = nullptr;
1412
1413 // Gather all GOT equivalent globals in the module. We really need two
1414 // passes over the globals: one to compute and another to avoid its emission
1415 // in EmitGlobalVariable, otherwise we would not be able to handle cases
1416 // where the got equivalent shows up before its use.
1417 computeGlobalGOTEquivs(M);
1418
1419 // Emit global variables.
1420 for (const auto &G : M.globals())
1421 EmitGlobalVariable(&G);
1
Calling 'AsmPrinter::EmitGlobalVariable'
1422
1423 // Emit remaining GOT equivalent globals.
1424 emitGlobalGOTEquivs();
1425
1426 // Emit visibility info for declarations
1427 for (const Function &F : M) {
1428 if (!F.isDeclarationForLinker())
1429 continue;
1430 GlobalValue::VisibilityTypes V = F.getVisibility();
1431 if (V == GlobalValue::DefaultVisibility)
1432 continue;
1433
1434 MCSymbol *Name = getSymbol(&F);
1435 EmitVisibility(Name, V, false);
1436 }
1437
1438 // Emit the remarks section contents.
1439 // FIXME: Figure out when is the safest time to emit this section. It should
1440 // not come after debug info.
1441 if (EnableRemarksSection)
1442 emitRemarksSection(M);
1443
1444 const TargetLoweringObjectFile &TLOF = getObjFileLowering();
1445
1446 TLOF.emitModuleMetadata(*OutStreamer, M);
1447
1448 if (TM.getTargetTriple().isOSBinFormatELF()) {
1449 MachineModuleInfoELF &MMIELF = MMI->getObjFileInfo<MachineModuleInfoELF>();
1450
1451 // Output stubs for external and common global variables.
1452 MachineModuleInfoELF::SymbolListTy Stubs = MMIELF.GetGVStubList();
1453 if (!Stubs.empty()) {
1454 OutStreamer->SwitchSection(TLOF.getDataSection());
1455 const DataLayout &DL = M.getDataLayout();
1456
1457 EmitAlignment(Log2_32(DL.getPointerSize()));
1458 for (const auto &Stub : Stubs) {
1459 OutStreamer->EmitLabel(Stub.first);
1460 OutStreamer->EmitSymbolValue(Stub.second.getPointer(),
1461 DL.getPointerSize());
1462 }
1463 }
1464 }
1465
1466 if (TM.getTargetTriple().isOSBinFormatCOFF()) {
1467 MachineModuleInfoCOFF &MMICOFF =
1468 MMI->getObjFileInfo<MachineModuleInfoCOFF>();
1469
1470 // Output stubs for external and common global variables.
1471 MachineModuleInfoCOFF::SymbolListTy Stubs = MMICOFF.GetGVStubList();
1472 if (!Stubs.empty()) {
1473 const DataLayout &DL = M.getDataLayout();
1474
1475 for (const auto &Stub : Stubs) {
1476 SmallString<256> SectionName = StringRef(".rdata$");
1477 SectionName += Stub.first->getName();
1478 OutStreamer->SwitchSection(OutContext.getCOFFSection(
1479 SectionName,
1480 COFF::IMAGE_SCN_CNT_INITIALIZED_DATA | COFF::IMAGE_SCN_MEM_READ |
1481 COFF::IMAGE_SCN_LNK_COMDAT,
1482 SectionKind::getReadOnly(), Stub.first->getName(),
1483 COFF::IMAGE_COMDAT_SELECT_ANY));
1484 EmitAlignment(Log2_32(DL.getPointerSize()));
1485 OutStreamer->EmitSymbolAttribute(Stub.first, MCSA_Global);
1486 OutStreamer->EmitLabel(Stub.first);
1487 OutStreamer->EmitSymbolValue(Stub.second.getPointer(),
1488 DL.getPointerSize());
1489 }
1490 }
1491 }
1492
1493 // Finalize debug and EH information.
1494 for (const HandlerInfo &HI : Handlers) {
1495 NamedRegionTimer T(HI.TimerName, HI.TimerDescription, HI.TimerGroupName,
1496 HI.TimerGroupDescription, TimePassesIsEnabled);
1497 HI.Handler->endModule();
1498 }
1499 Handlers.clear();
1500 DD = nullptr;
1501
1502 // If the target wants to know about weak references, print them all.
1503 if (MAI->getWeakRefDirective()) {
1504 // FIXME: This is not lazy, it would be nice to only print weak references
1505 // to stuff that is actually used. Note that doing so would require targets
1506 // to notice uses in operands (due to constant exprs etc). This should
1507 // happen with the MC stuff eventually.
1508
1509 // Print out module-level global objects here.
1510 for (const auto &GO : M.global_objects()) {
1511 if (!GO.hasExternalWeakLinkage())
1512 continue;
1513 OutStreamer->EmitSymbolAttribute(getSymbol(&GO), MCSA_WeakReference);
1514 }
1515 }
1516
1517 OutStreamer->AddBlankLine();
1518
1519 // Print aliases in topological order, that is, for each alias a = b,
1520 // b must be printed before a.
1521 // This is because on some targets (e.g. PowerPC) linker expects aliases in
1522 // such an order to generate correct TOC information.
1523 SmallVector<const GlobalAlias *, 16> AliasStack;
1524 SmallPtrSet<const GlobalAlias *, 16> AliasVisited;
1525 for (const auto &Alias : M.aliases()) {
1526 for (const GlobalAlias *Cur = &Alias; Cur;
1527 Cur = dyn_cast<GlobalAlias>(Cur->getAliasee())) {
1528 if (!AliasVisited.insert(Cur).second)
1529 break;
1530 AliasStack.push_back(Cur);
1531 }
1532 for (const GlobalAlias *AncestorAlias : llvm::reverse(AliasStack))
1533 emitGlobalIndirectSymbol(M, *AncestorAlias);
1534 AliasStack.clear();
1535 }
1536 for (const auto &IFunc : M.ifuncs())
1537 emitGlobalIndirectSymbol(M, IFunc);
1538
1539 GCModuleInfo *MI = getAnalysisIfAvailable<GCModuleInfo>();
1540 assert(MI && "AsmPrinter didn't require GCModuleInfo?")((MI && "AsmPrinter didn't require GCModuleInfo?") ? static_cast
<void> (0) : __assert_fail ("MI && \"AsmPrinter didn't require GCModuleInfo?\""
, "/build/llvm-toolchain-snapshot-9~svn362543/lib/CodeGen/AsmPrinter/AsmPrinter.cpp"
, 1540, __PRETTY_FUNCTION__))
;
1541 for (GCModuleInfo::iterator I = MI->end(), E = MI->begin(); I != E; )
1542 if (GCMetadataPrinter *MP = GetOrCreateGCPrinter(**--I))
1543 MP->finishAssembly(M, *MI, *this);
1544
1545 // Emit llvm.ident metadata in an '.ident' directive.
1546 EmitModuleIdents(M);
1547
1548 // Emit bytes for llvm.commandline metadata.
1549 EmitModuleCommandLines(M);
1550
1551 // Emit __morestack address if needed for indirect calls.
1552 if (MMI->usesMorestackAddr()) {
1553 unsigned Align = 1;
1554 MCSection *ReadOnlySection = getObjFileLowering().getSectionForConstant(
1555 getDataLayout(), SectionKind::getReadOnly(),
1556 /*C=*/nullptr, Align);
1557 OutStreamer->SwitchSection(ReadOnlySection);
1558
1559 MCSymbol *AddrSymbol =
1560 OutContext.getOrCreateSymbol(StringRef("__morestack_addr"));
1561 OutStreamer->EmitLabel(AddrSymbol);
1562
1563 unsigned PtrSize = MAI->getCodePointerSize();
1564 OutStreamer->EmitSymbolValue(GetExternalSymbolSymbol("__morestack"),
1565 PtrSize);
1566 }
1567
1568 // Emit .note.GNU-split-stack and .note.GNU-no-split-stack sections if
1569 // split-stack is used.
1570 if (TM.getTargetTriple().isOSBinFormatELF() && MMI->hasSplitStack()) {
1571 OutStreamer->SwitchSection(
1572 OutContext.getELFSection(".note.GNU-split-stack", ELF::SHT_PROGBITS, 0));
1573 if (MMI->hasNosplitStack())
1574 OutStreamer->SwitchSection(
1575 OutContext.getELFSection(".note.GNU-no-split-stack", ELF::SHT_PROGBITS, 0));
1576 }
1577
1578 // If we don't have any trampolines, then we don't require stack memory
1579 // to be executable. Some targets have a directive to declare this.
1580 Function *InitTrampolineIntrinsic = M.getFunction("llvm.init.trampoline");
1581 if (!InitTrampolineIntrinsic || InitTrampolineIntrinsic->use_empty())
1582 if (MCSection *S = MAI->getNonexecutableStackSection(OutContext))
1583 OutStreamer->SwitchSection(S);
1584
1585 if (TM.getTargetTriple().isOSBinFormatCOFF()) {
1586 // Emit /EXPORT: flags for each exported global as necessary.
1587 const auto &TLOF = getObjFileLowering();
1588 std::string Flags;
1589
1590 for (const GlobalValue &GV : M.global_values()) {
1591 raw_string_ostream OS(Flags);
1592 TLOF.emitLinkerFlagsForGlobal(OS, &GV);
1593 OS.flush();
1594 if (!Flags.empty()) {
1595 OutStreamer->SwitchSection(TLOF.getDrectveSection());
1596 OutStreamer->EmitBytes(Flags);
1597 }
1598 Flags.clear();
1599 }
1600
1601 // Emit /INCLUDE: flags for each used global as necessary.
1602 if (const auto *LU = M.getNamedGlobal("llvm.used")) {
1603 assert(LU->hasInitializer() &&((LU->hasInitializer() && "expected llvm.used to have an initializer"
) ? static_cast<void> (0) : __assert_fail ("LU->hasInitializer() && \"expected llvm.used to have an initializer\""
, "/build/llvm-toolchain-snapshot-9~svn362543/lib/CodeGen/AsmPrinter/AsmPrinter.cpp"
, 1604, __PRETTY_FUNCTION__))
1604 "expected llvm.used to have an initializer")((LU->hasInitializer() && "expected llvm.used to have an initializer"
) ? static_cast<void> (0) : __assert_fail ("LU->hasInitializer() && \"expected llvm.used to have an initializer\""
, "/build/llvm-toolchain-snapshot-9~svn362543/lib/CodeGen/AsmPrinter/AsmPrinter.cpp"
, 1604, __PRETTY_FUNCTION__))
;
1605 assert(isa<ArrayType>(LU->getValueType()) &&((isa<ArrayType>(LU->getValueType()) && "expected llvm.used to be an array type"
) ? static_cast<void> (0) : __assert_fail ("isa<ArrayType>(LU->getValueType()) && \"expected llvm.used to be an array type\""
, "/build/llvm-toolchain-snapshot-9~svn362543/lib/CodeGen/AsmPrinter/AsmPrinter.cpp"
, 1606, __PRETTY_FUNCTION__))
1606 "expected llvm.used to be an array type")((isa<ArrayType>(LU->getValueType()) && "expected llvm.used to be an array type"
) ? static_cast<void> (0) : __assert_fail ("isa<ArrayType>(LU->getValueType()) && \"expected llvm.used to be an array type\""
, "/build/llvm-toolchain-snapshot-9~svn362543/lib/CodeGen/AsmPrinter/AsmPrinter.cpp"
, 1606, __PRETTY_FUNCTION__))
;
1607 if (const auto *A = cast<ConstantArray>(LU->getInitializer())) {
1608 for (const Value *Op : A->operands()) {
1609 const auto *GV =
1610 cast<GlobalValue>(Op->stripPointerCastsNoFollowAliases());
1611 // Global symbols with internal or private linkage are not visible to
1612 // the linker, and thus would cause an error when the linker tried to
1613 // preserve the symbol due to the `/include:` directive.
1614 if (GV->hasLocalLinkage())
1615 continue;
1616
1617 raw_string_ostream OS(Flags);
1618 TLOF.emitLinkerFlagsForUsed(OS, GV);
1619 OS.flush();
1620
1621 if (!Flags.empty()) {
1622 OutStreamer->SwitchSection(TLOF.getDrectveSection());
1623 OutStreamer->EmitBytes(Flags);
1624 }
1625 Flags.clear();
1626 }
1627 }
1628 }
1629 }
1630
1631 if (TM.Options.EmitAddrsig) {
1632 // Emit address-significance attributes for all globals.
1633 OutStreamer->EmitAddrsig();
1634 for (const GlobalValue &GV : M.global_values())
1635 if (!GV.use_empty() && !GV.isThreadLocal() &&
1636 !GV.hasDLLImportStorageClass() && !GV.getName().startswith("llvm.") &&
1637 !GV.hasAtLeastLocalUnnamedAddr())
1638 OutStreamer->EmitAddrsigSym(getSymbol(&GV));
1639 }
1640
1641 // Emit symbol partition specifications (ELF only).
1642 if (TM.getTargetTriple().isOSBinFormatELF()) {
1643 unsigned UniqueID = 0;
1644 for (const GlobalValue &GV : M.global_values()) {
1645 if (!GV.hasPartition() || GV.isDeclarationForLinker() ||
1646 GV.getVisibility() != GlobalValue::DefaultVisibility)
1647 continue;
1648
1649 OutStreamer->SwitchSection(OutContext.getELFSection(
1650 ".llvm_sympart", ELF::SHT_LLVM_SYMPART, 0, 0, "", ++UniqueID));
1651 OutStreamer->EmitBytes(GV.getPartition());
1652 OutStreamer->EmitZeros(1);
1653 OutStreamer->EmitValue(
1654 MCSymbolRefExpr::create(getSymbol(&GV), OutContext),
1655 MAI->getCodePointerSize());
1656 }
1657 }
1658
1659 // Allow the target to emit any magic that it wants at the end of the file,
1660 // after everything else has gone out.
1661 EmitEndOfAsmFile(M);
1662
1663 MMI = nullptr;
1664
1665 OutStreamer->Finish();
1666 OutStreamer->reset();
1667 OwnedMLI.reset();
1668 OwnedMDT.reset();
1669
1670 return false;
1671}
1672
1673MCSymbol *AsmPrinter::getCurExceptionSym() {
1674 if (!CurExceptionSym)
1675 CurExceptionSym = createTempSymbol("exception");
1676 return CurExceptionSym;
1677}
1678
1679void AsmPrinter::SetupMachineFunction(MachineFunction &MF) {
1680 this->MF = &MF;
1681 // Get the function symbol.
1682 CurrentFnSym = getSymbol(&MF.getFunction());
1683 CurrentFnSymForSize = CurrentFnSym;
1684 CurrentFnBegin = nullptr;
1685 CurExceptionSym = nullptr;
1686 bool NeedsLocalForSize = MAI->needsLocalForSize();
1687 if (needFuncLabelsForEHOrDebugInfo(MF, MMI) || NeedsLocalForSize ||
1688 MF.getTarget().Options.EmitStackSizeSection) {
1689 CurrentFnBegin = createTempSymbol("func_begin");
1690 if (NeedsLocalForSize)
1691 CurrentFnSymForSize = CurrentFnBegin;
1692 }
1693
1694 ORE = &getAnalysis<MachineOptimizationRemarkEmitterPass>().getORE();
1695}
1696
1697namespace {
1698
1699// Keep track the alignment, constpool entries per Section.
1700 struct SectionCPs {
1701 MCSection *S;
1702 unsigned Alignment;
1703 SmallVector<unsigned, 4> CPEs;
1704
1705 SectionCPs(MCSection *s, unsigned a) : S(s), Alignment(a) {}
1706 };
1707
1708} // end anonymous namespace
1709
1710/// EmitConstantPool - Print to the current output stream assembly
1711/// representations of the constants in the constant pool MCP. This is
1712/// used to print out constants which have been "spilled to memory" by
1713/// the code generator.
1714void AsmPrinter::EmitConstantPool() {
1715 const MachineConstantPool *MCP = MF->getConstantPool();
1716 const std::vector<MachineConstantPoolEntry> &CP = MCP->getConstants();
1717 if (CP.empty()) return;
1718
1719 // Calculate sections for constant pool entries. We collect entries to go into
1720 // the same section together to reduce amount of section switch statements.
1721 SmallVector<SectionCPs, 4> CPSections;
1722 for (unsigned i = 0, e = CP.size(); i != e; ++i) {
1723 const MachineConstantPoolEntry &CPE = CP[i];
1724 unsigned Align = CPE.getAlignment();
1725
1726 SectionKind Kind = CPE.getSectionKind(&getDataLayout());
1727
1728 const Constant *C = nullptr;
1729 if (!CPE.isMachineConstantPoolEntry())
1730 C = CPE.Val.ConstVal;
1731
1732 MCSection *S = getObjFileLowering().getSectionForConstant(getDataLayout(),
1733 Kind, C, Align);
1734
1735 // The number of sections are small, just do a linear search from the
1736 // last section to the first.
1737 bool Found = false;
1738 unsigned SecIdx = CPSections.size();
1739 while (SecIdx != 0) {
1740 if (CPSections[--SecIdx].S == S) {
1741 Found = true;
1742 break;
1743 }
1744 }
1745 if (!Found) {
1746 SecIdx = CPSections.size();
1747 CPSections.push_back(SectionCPs(S, Align));
1748 }
1749
1750 if (Align > CPSections[SecIdx].Alignment)
1751 CPSections[SecIdx].Alignment = Align;
1752 CPSections[SecIdx].CPEs.push_back(i);
1753 }
1754
1755 // Now print stuff into the calculated sections.
1756 const MCSection *CurSection = nullptr;
1757 unsigned Offset = 0;
1758 for (unsigned i = 0, e = CPSections.size(); i != e; ++i) {
1759 for (unsigned j = 0, ee = CPSections[i].CPEs.size(); j != ee; ++j) {
1760 unsigned CPI = CPSections[i].CPEs[j];
1761 MCSymbol *Sym = GetCPISymbol(CPI);
1762 if (!Sym->isUndefined())
1763 continue;
1764
1765 if (CurSection != CPSections[i].S) {
1766 OutStreamer->SwitchSection(CPSections[i].S);
1767 EmitAlignment(Log2_32(CPSections[i].Alignment));
1768 CurSection = CPSections[i].S;
1769 Offset = 0;
1770 }
1771
1772 MachineConstantPoolEntry CPE = CP[CPI];
1773
1774 // Emit inter-object padding for alignment.
1775 unsigned AlignMask = CPE.getAlignment() - 1;
1776 unsigned NewOffset = (Offset + AlignMask) & ~AlignMask;
1777 OutStreamer->EmitZeros(NewOffset - Offset);
1778
1779 Type *Ty = CPE.getType();
1780 Offset = NewOffset + getDataLayout().getTypeAllocSize(Ty);
1781
1782 OutStreamer->EmitLabel(Sym);
1783 if (CPE.isMachineConstantPoolEntry())
1784 EmitMachineConstantPoolValue(CPE.Val.MachineCPVal);
1785 else
1786 EmitGlobalConstant(getDataLayout(), CPE.Val.ConstVal);
1787 }
1788 }
1789}
1790
1791/// EmitJumpTableInfo - Print assembly representations of the jump tables used
1792/// by the current function to the current output stream.
1793void AsmPrinter::EmitJumpTableInfo() {
1794 const DataLayout &DL = MF->getDataLayout();
1795 const MachineJumpTableInfo *MJTI = MF->getJumpTableInfo();
1796 if (!MJTI) return;
1797 if (MJTI->getEntryKind() == MachineJumpTableInfo::EK_Inline) return;
1798 const std::vector<MachineJumpTableEntry> &JT = MJTI->getJumpTables();
1799 if (JT.empty()) return;
1800
1801 // Pick the directive to use to print the jump table entries, and switch to
1802 // the appropriate section.
1803 const Function &F = MF->getFunction();
1804 const TargetLoweringObjectFile &TLOF = getObjFileLowering();
1805 bool JTInDiffSection = !TLOF.shouldPutJumpTableInFunctionSection(
1806 MJTI->getEntryKind() == MachineJumpTableInfo::EK_LabelDifference32,
1807 F);
1808 if (JTInDiffSection) {
1809 // Drop it in the readonly section.
1810 MCSection *ReadOnlySection = TLOF.getSectionForJumpTable(F, TM);
1811 OutStreamer->SwitchSection(ReadOnlySection);
1812 }
1813
1814 EmitAlignment(Log2_32(MJTI->getEntryAlignment(DL)));
1815
1816 // Jump tables in code sections are marked with a data_region directive
1817 // where that's supported.
1818 if (!JTInDiffSection)
1819 OutStreamer->EmitDataRegion(MCDR_DataRegionJT32);
1820
1821 for (unsigned JTI = 0, e = JT.size(); JTI != e; ++JTI) {
1822 const std::vector<MachineBasicBlock*> &JTBBs = JT[JTI].MBBs;
1823
1824 // If this jump table was deleted, ignore it.
1825 if (JTBBs.empty()) continue;
1826
1827 // For the EK_LabelDifference32 entry, if using .set avoids a relocation,
1828 /// emit a .set directive for each unique entry.
1829 if (MJTI->getEntryKind() == MachineJumpTableInfo::EK_LabelDifference32 &&
1830 MAI->doesSetDirectiveSuppressReloc()) {
1831 SmallPtrSet<const MachineBasicBlock*, 16> EmittedSets;
1832 const TargetLowering *TLI = MF->getSubtarget().getTargetLowering();
1833 const MCExpr *Base = TLI->getPICJumpTableRelocBaseExpr(MF,JTI,OutContext);
1834 for (unsigned ii = 0, ee = JTBBs.size(); ii != ee; ++ii) {
1835 const MachineBasicBlock *MBB = JTBBs[ii];
1836 if (!EmittedSets.insert(MBB).second)
1837 continue;
1838
1839 // .set LJTSet, LBB32-base
1840 const MCExpr *LHS =
1841 MCSymbolRefExpr::create(MBB->getSymbol(), OutContext);
1842 OutStreamer->EmitAssignment(GetJTSetSymbol(JTI, MBB->getNumber()),
1843 MCBinaryExpr::createSub(LHS, Base,
1844 OutContext));
1845 }
1846 }
1847
1848 // On some targets (e.g. Darwin) we want to emit two consecutive labels
1849 // before each jump table. The first label is never referenced, but tells
1850 // the assembler and linker the extents of the jump table object. The
1851 // second label is actually referenced by the code.
1852 if (JTInDiffSection && DL.hasLinkerPrivateGlobalPrefix())
1853 // FIXME: This doesn't have to have any specific name, just any randomly
1854 // named and numbered 'l' label would work. Simplify GetJTISymbol.
1855 OutStreamer->EmitLabel(GetJTISymbol(JTI, true));
1856
1857 OutStreamer->EmitLabel(GetJTISymbol(JTI));
1858
1859 for (unsigned ii = 0, ee = JTBBs.size(); ii != ee; ++ii)
1860 EmitJumpTableEntry(MJTI, JTBBs[ii], JTI);
1861 }
1862 if (!JTInDiffSection)
1863 OutStreamer->EmitDataRegion(MCDR_DataRegionEnd);
1864}
1865
1866/// EmitJumpTableEntry - Emit a jump table entry for the specified MBB to the
1867/// current stream.
1868void AsmPrinter::EmitJumpTableEntry(const MachineJumpTableInfo *MJTI,
1869 const MachineBasicBlock *MBB,
1870 unsigned UID) const {
1871 assert(MBB && MBB->getNumber() >= 0 && "Invalid basic block")((MBB && MBB->getNumber() >= 0 && "Invalid basic block"
) ? static_cast<void> (0) : __assert_fail ("MBB && MBB->getNumber() >= 0 && \"Invalid basic block\""
, "/build/llvm-toolchain-snapshot-9~svn362543/lib/CodeGen/AsmPrinter/AsmPrinter.cpp"
, 1871, __PRETTY_FUNCTION__))
;
1872 const MCExpr *Value = nullptr;
1873 switch (MJTI->getEntryKind()) {
1874 case MachineJumpTableInfo::EK_Inline:
1875 llvm_unreachable("Cannot emit EK_Inline jump table entry")::llvm::llvm_unreachable_internal("Cannot emit EK_Inline jump table entry"
, "/build/llvm-toolchain-snapshot-9~svn362543/lib/CodeGen/AsmPrinter/AsmPrinter.cpp"
, 1875)
;
1876 case MachineJumpTableInfo::EK_Custom32:
1877 Value = MF->getSubtarget().getTargetLowering()->LowerCustomJumpTableEntry(
1878 MJTI, MBB, UID, OutContext);
1879 break;
1880 case MachineJumpTableInfo::EK_BlockAddress:
1881 // EK_BlockAddress - Each entry is a plain address of block, e.g.:
1882 // .word LBB123
1883 Value = MCSymbolRefExpr::create(MBB->getSymbol(), OutContext);
1884 break;
1885 case MachineJumpTableInfo::EK_GPRel32BlockAddress: {
1886 // EK_GPRel32BlockAddress - Each entry is an address of block, encoded
1887 // with a relocation as gp-relative, e.g.:
1888 // .gprel32 LBB123
1889 MCSymbol *MBBSym = MBB->getSymbol();
1890 OutStreamer->EmitGPRel32Value(MCSymbolRefExpr::create(MBBSym, OutContext));
1891 return;
1892 }
1893
1894 case MachineJumpTableInfo::EK_GPRel64BlockAddress: {
1895 // EK_GPRel64BlockAddress - Each entry is an address of block, encoded
1896 // with a relocation as gp-relative, e.g.:
1897 // .gpdword LBB123
1898 MCSymbol *MBBSym = MBB->getSymbol();
1899 OutStreamer->EmitGPRel64Value(MCSymbolRefExpr::create(MBBSym, OutContext));
1900 return;
1901 }
1902
1903 case MachineJumpTableInfo::EK_LabelDifference32: {
1904 // Each entry is the address of the block minus the address of the jump
1905 // table. This is used for PIC jump tables where gprel32 is not supported.
1906 // e.g.:
1907 // .word LBB123 - LJTI1_2
1908 // If the .set directive avoids relocations, this is emitted as:
1909 // .set L4_5_set_123, LBB123 - LJTI1_2
1910 // .word L4_5_set_123
1911 if (MAI->doesSetDirectiveSuppressReloc()) {
1912 Value = MCSymbolRefExpr::create(GetJTSetSymbol(UID, MBB->getNumber()),
1913 OutContext);
1914 break;
1915 }
1916 Value = MCSymbolRefExpr::create(MBB->getSymbol(), OutContext);
1917 const TargetLowering *TLI = MF->getSubtarget().getTargetLowering();
1918 const MCExpr *Base = TLI->getPICJumpTableRelocBaseExpr(MF, UID, OutContext);
1919 Value = MCBinaryExpr::createSub(Value, Base, OutContext);
1920 break;
1921 }
1922 }
1923
1924 assert(Value && "Unknown entry kind!")((Value && "Unknown entry kind!") ? static_cast<void
> (0) : __assert_fail ("Value && \"Unknown entry kind!\""
, "/build/llvm-toolchain-snapshot-9~svn362543/lib/CodeGen/AsmPrinter/AsmPrinter.cpp"
, 1924, __PRETTY_FUNCTION__))
;
1925
1926 unsigned EntrySize = MJTI->getEntrySize(getDataLayout());
1927 OutStreamer->EmitValue(Value, EntrySize);
1928}
1929
1930/// EmitSpecialLLVMGlobal - Check to see if the specified global is a
1931/// special global used by LLVM. If so, emit it and return true, otherwise
1932/// do nothing and return false.
1933bool AsmPrinter::EmitSpecialLLVMGlobal(const GlobalVariable *GV) {
1934 if (GV->getName() == "llvm.used") {
1935 if (MAI->hasNoDeadStrip()) // No need to emit this at all.
1936 EmitLLVMUsedList(cast<ConstantArray>(GV->getInitializer()));
1937 return true;
1938 }
1939
1940 // Ignore debug and non-emitted data. This handles llvm.compiler.used.
1941 if (GV->getSection() == "llvm.metadata" ||
1942 GV->hasAvailableExternallyLinkage())
1943 return true;
1944
1945 if (!GV->hasAppendingLinkage()) return false;
1946
1947 assert(GV->hasInitializer() && "Not a special LLVM global!")((GV->hasInitializer() && "Not a special LLVM global!"
) ? static_cast<void> (0) : __assert_fail ("GV->hasInitializer() && \"Not a special LLVM global!\""
, "/build/llvm-toolchain-snapshot-9~svn362543/lib/CodeGen/AsmPrinter/AsmPrinter.cpp"
, 1947, __PRETTY_FUNCTION__))
;
1948
1949 if (GV->getName() == "llvm.global_ctors") {
1950 EmitXXStructorList(GV->getParent()->getDataLayout(), GV->getInitializer(),
1951 /* isCtor */ true);
1952
1953 return true;
1954 }
1955
1956 if (GV->getName() == "llvm.global_dtors") {
1957 EmitXXStructorList(GV->getParent()->getDataLayout(), GV->getInitializer(),
1958 /* isCtor */ false);
1959
1960 return true;
1961 }
1962
1963 report_fatal_error("unknown special variable");
1964}
1965
1966/// EmitLLVMUsedList - For targets that define a MAI::UsedDirective, mark each
1967/// global in the specified llvm.used list.
1968void AsmPrinter::EmitLLVMUsedList(const ConstantArray *InitList) {
1969 // Should be an array of 'i8*'.
1970 for (unsigned i = 0, e = InitList->getNumOperands(); i != e; ++i) {
1971 const GlobalValue *GV =
1972 dyn_cast<GlobalValue>(InitList->getOperand(i)->stripPointerCasts());
1973 if (GV)
1974 OutStreamer->EmitSymbolAttribute(getSymbol(GV), MCSA_NoDeadStrip);
1975 }
1976}
1977
1978namespace {
1979
1980struct Structor {
1981 int Priority = 0;
1982 Constant *Func = nullptr;
1983 GlobalValue *ComdatKey = nullptr;
1984
1985 Structor() = default;
1986};
1987
1988} // end anonymous namespace
1989
1990/// EmitXXStructorList - Emit the ctor or dtor list taking into account the init
1991/// priority.
1992void AsmPrinter::EmitXXStructorList(const DataLayout &DL, const Constant *List,
1993 bool isCtor) {
1994 // Should be an array of '{ i32, void ()*, i8* }' structs. The first value is the
1995 // init priority.
1996 if (!isa<ConstantArray>(List)) return;
1997
1998 // Sanity check the structors list.
1999 const ConstantArray *InitList = dyn_cast<ConstantArray>(List);
2000 if (!InitList) return; // Not an array!
2001 StructType *ETy = dyn_cast<StructType>(InitList->getType()->getElementType());
2002 if (!ETy || ETy->getNumElements() != 3 ||
2003 !isa<IntegerType>(ETy->getTypeAtIndex(0U)) ||
2004 !isa<PointerType>(ETy->getTypeAtIndex(1U)) ||
2005 !isa<PointerType>(ETy->getTypeAtIndex(2U)))
2006 return; // Not (int, ptr, ptr).
2007
2008 // Gather the structors in a form that's convenient for sorting by priority.
2009 SmallVector<Structor, 8> Structors;
2010 for (Value *O : InitList->operands()) {
2011 ConstantStruct *CS = dyn_cast<ConstantStruct>(O);
2012 if (!CS) continue; // Malformed.
2013 if (CS->getOperand(1)->isNullValue())
2014 break; // Found a null terminator, skip the rest.
2015 ConstantInt *Priority = dyn_cast<ConstantInt>(CS->getOperand(0));
2016 if (!Priority) continue; // Malformed.
2017 Structors.push_back(Structor());
2018 Structor &S = Structors.back();
2019 S.Priority = Priority->getLimitedValue(65535);
2020 S.Func = CS->getOperand(1);
2021 if (!CS->getOperand(2)->isNullValue())
2022 S.ComdatKey =
2023 dyn_cast<GlobalValue>(CS->getOperand(2)->stripPointerCasts());
2024 }
2025
2026 // Emit the function pointers in the target-specific order
2027 unsigned Align = Log2_32(DL.getPointerPrefAlignment());
2028 llvm::stable_sort(Structors, [](const Structor &L, const Structor &R) {
2029 return L.Priority < R.Priority;
2030 });
2031 for (Structor &S : Structors) {
2032 const TargetLoweringObjectFile &Obj = getObjFileLowering();
2033 const MCSymbol *KeySym = nullptr;
2034 if (GlobalValue *GV = S.ComdatKey) {
2035 if (GV->isDeclarationForLinker())
2036 // If the associated variable is not defined in this module
2037 // (it might be available_externally, or have been an
2038 // available_externally definition that was dropped by the
2039 // EliminateAvailableExternally pass), some other TU
2040 // will provide its dynamic initializer.
2041 continue;
2042
2043 KeySym = getSymbol(GV);
2044 }
2045 MCSection *OutputSection =
2046 (isCtor ? Obj.getStaticCtorSection(S.Priority, KeySym)
2047 : Obj.getStaticDtorSection(S.Priority, KeySym));
2048 OutStreamer->SwitchSection(OutputSection);
2049 if (OutStreamer->getCurrentSection() != OutStreamer->getPreviousSection())
2050 EmitAlignment(Align);
2051 EmitXXStructor(DL, S.Func);
2052 }
2053}
2054
2055void AsmPrinter::EmitModuleIdents(Module &M) {
2056 if (!MAI->hasIdentDirective())
2057 return;
2058
2059 if (const NamedMDNode *NMD = M.getNamedMetadata("llvm.ident")) {
2060 for (unsigned i = 0, e = NMD->getNumOperands(); i != e; ++i) {
2061 const MDNode *N = NMD->getOperand(i);
2062 assert(N->getNumOperands() == 1 &&((N->getNumOperands() == 1 && "llvm.ident metadata entry can have only one operand"
) ? static_cast<void> (0) : __assert_fail ("N->getNumOperands() == 1 && \"llvm.ident metadata entry can have only one operand\""
, "/build/llvm-toolchain-snapshot-9~svn362543/lib/CodeGen/AsmPrinter/AsmPrinter.cpp"
, 2063, __PRETTY_FUNCTION__))
2063 "llvm.ident metadata entry can have only one operand")((N->getNumOperands() == 1 && "llvm.ident metadata entry can have only one operand"
) ? static_cast<void> (0) : __assert_fail ("N->getNumOperands() == 1 && \"llvm.ident metadata entry can have only one operand\""
, "/build/llvm-toolchain-snapshot-9~svn362543/lib/CodeGen/AsmPrinter/AsmPrinter.cpp"
, 2063, __PRETTY_FUNCTION__))
;
2064 const MDString *S = cast<MDString>(N->getOperand(0));
2065 OutStreamer->EmitIdent(S->getString());
2066 }
2067 }
2068}
2069
2070void AsmPrinter::EmitModuleCommandLines(Module &M) {
2071 MCSection *CommandLine = getObjFileLowering().getSectionForCommandLines();
2072 if (!CommandLine)
2073 return;
2074
2075 const NamedMDNode *NMD = M.getNamedMetadata("llvm.commandline");
2076 if (!NMD || !NMD->getNumOperands())
2077 return;
2078
2079 OutStreamer->PushSection();
2080 OutStreamer->SwitchSection(CommandLine);
2081 OutStreamer->EmitZeros(1);
2082 for (unsigned i = 0, e = NMD->getNumOperands(); i != e; ++i) {
2083 const MDNode *N = NMD->getOperand(i);
2084 assert(N->getNumOperands() == 1 &&((N->getNumOperands() == 1 && "llvm.commandline metadata entry can have only one operand"
) ? static_cast<void> (0) : __assert_fail ("N->getNumOperands() == 1 && \"llvm.commandline metadata entry can have only one operand\""
, "/build/llvm-toolchain-snapshot-9~svn362543/lib/CodeGen/AsmPrinter/AsmPrinter.cpp"
, 2085, __PRETTY_FUNCTION__))
2085 "llvm.commandline metadata entry can have only one operand")((N->getNumOperands() == 1 && "llvm.commandline metadata entry can have only one operand"
) ? static_cast<void> (0) : __assert_fail ("N->getNumOperands() == 1 && \"llvm.commandline metadata entry can have only one operand\""
, "/build/llvm-toolchain-snapshot-9~svn362543/lib/CodeGen/AsmPrinter/AsmPrinter.cpp"
, 2085, __PRETTY_FUNCTION__))
;
2086 const MDString *S = cast<MDString>(N->getOperand(0));
2087 OutStreamer->EmitBytes(S->getString());
2088 OutStreamer->EmitZeros(1);
2089 }
2090 OutStreamer->PopSection();
2091}
2092
2093//===--------------------------------------------------------------------===//
2094// Emission and print routines
2095//
2096
2097/// Emit a byte directive and value.
2098///
2099void AsmPrinter::emitInt8(int Value) const {
2100 OutStreamer->EmitIntValue(Value, 1);
2101}
2102
2103/// Emit a short directive and value.
2104void AsmPrinter::emitInt16(int Value) const {
2105 OutStreamer->EmitIntValue(Value, 2);
2106}
2107
2108/// Emit a long directive and value.
2109void AsmPrinter::emitInt32(int Value) const {
2110 OutStreamer->EmitIntValue(Value, 4);
2111}
2112
2113/// Emit a long long directive and value.
2114void AsmPrinter::emitInt64(uint64_t Value) const {
2115 OutStreamer->EmitIntValue(Value, 8);
2116}
2117
2118/// Emit something like ".long Hi-Lo" where the size in bytes of the directive
2119/// is specified by Size and Hi/Lo specify the labels. This implicitly uses
2120/// .set if it avoids relocations.
2121void AsmPrinter::EmitLabelDifference(const MCSymbol *Hi, const MCSymbol *Lo,
2122 unsigned Size) const {
2123 OutStreamer->emitAbsoluteSymbolDiff(Hi, Lo, Size);
2124}
2125
2126/// EmitLabelPlusOffset - Emit something like ".long Label+Offset"
2127/// where the size in bytes of the directive is specified by Size and Label
2128/// specifies the label. This implicitly uses .set if it is available.
2129void AsmPrinter::EmitLabelPlusOffset(const MCSymbol *Label, uint64_t Offset,
2130 unsigned Size,
2131 bool IsSectionRelative) const {
2132 if (MAI->needsDwarfSectionOffsetDirective() && IsSectionRelative) {
2133 OutStreamer->EmitCOFFSecRel32(Label, Offset);
2134 if (Size > 4)
2135 OutStreamer->EmitZeros(Size - 4);
2136 return;
2137 }
2138
2139 // Emit Label+Offset (or just Label if Offset is zero)
2140 const MCExpr *Expr = MCSymbolRefExpr::create(Label, OutContext);
2141 if (Offset)
2142 Expr = MCBinaryExpr::createAdd(
2143 Expr, MCConstantExpr::create(Offset, OutContext), OutContext);
2144
2145 OutStreamer->EmitValue(Expr, Size);
2146}
2147
2148//===----------------------------------------------------------------------===//
2149
2150// EmitAlignment - Emit an alignment directive to the specified power of
2151// two boundary. For example, if you pass in 3 here, you will get an 8
2152// byte alignment. If a global value is specified, and if that global has
2153// an explicit alignment requested, it will override the alignment request
2154// if required for correctness.
2155void AsmPrinter::EmitAlignment(unsigned NumBits, const GlobalObject *GV) const {
2156 if (GV)
2157 NumBits = getGVAlignmentLog2(GV, GV->getParent()->getDataLayout(), NumBits);
2158
2159 if (NumBits == 0) return; // 1-byte aligned: no need to emit alignment.
2160
2161 assert(NumBits <((NumBits < static_cast<unsigned>(std::numeric_limits
<unsigned>::digits) && "undefined behavior") ? static_cast
<void> (0) : __assert_fail ("NumBits < static_cast<unsigned>(std::numeric_limits<unsigned>::digits) && \"undefined behavior\""
, "/build/llvm-toolchain-snapshot-9~svn362543/lib/CodeGen/AsmPrinter/AsmPrinter.cpp"
, 2163, __PRETTY_FUNCTION__))
2162 static_cast<unsigned>(std::numeric_limits<unsigned>::digits) &&((NumBits < static_cast<unsigned>(std::numeric_limits
<unsigned>::digits) && "undefined behavior") ? static_cast
<void> (0) : __assert_fail ("NumBits < static_cast<unsigned>(std::numeric_limits<unsigned>::digits) && \"undefined behavior\""
, "/build/llvm-toolchain-snapshot-9~svn362543/lib/CodeGen/AsmPrinter/AsmPrinter.cpp"
, 2163, __PRETTY_FUNCTION__))
2163 "undefined behavior")((NumBits < static_cast<unsigned>(std::numeric_limits
<unsigned>::digits) && "undefined behavior") ? static_cast
<void> (0) : __assert_fail ("NumBits < static_cast<unsigned>(std::numeric_limits<unsigned>::digits) && \"undefined behavior\""
, "/build/llvm-toolchain-snapshot-9~svn362543/lib/CodeGen/AsmPrinter/AsmPrinter.cpp"
, 2163, __PRETTY_FUNCTION__))
;
2164 if (getCurrentSection()->getKind().isText())
2165 OutStreamer->EmitCodeAlignment(1u << NumBits);
2166 else
2167 OutStreamer->EmitValueToAlignment(1u << NumBits);
2168}
2169
2170//===----------------------------------------------------------------------===//
2171// Constant emission.
2172//===----------------------------------------------------------------------===//
2173
2174const MCExpr *AsmPrinter::lowerConstant(const Constant *CV) {
2175 MCContext &Ctx = OutContext;
2176
2177 if (CV->isNullValue() || isa<UndefValue>(CV))
2178 return MCConstantExpr::create(0, Ctx);
2179
2180 if (const ConstantInt *CI = dyn_cast<ConstantInt>(CV))
2181 return MCConstantExpr::create(CI->getZExtValue(), Ctx);
2182
2183 if (const GlobalValue *GV = dyn_cast<GlobalValue>(CV))
2184 return MCSymbolRefExpr::create(getSymbol(GV), Ctx);
2185
2186 if (const BlockAddress *BA = dyn_cast<BlockAddress>(CV))
2187 return MCSymbolRefExpr::create(GetBlockAddressSymbol(BA), Ctx);
2188
2189 const ConstantExpr *CE = dyn_cast<ConstantExpr>(CV);
2190 if (!CE) {
2191 llvm_unreachable("Unknown constant value to lower!")::llvm::llvm_unreachable_internal("Unknown constant value to lower!"
, "/build/llvm-toolchain-snapshot-9~svn362543/lib/CodeGen/AsmPrinter/AsmPrinter.cpp"
, 2191)
;
2192 }
2193
2194 switch (CE->getOpcode()) {
2195 default:
2196 // If the code isn't optimized, there may be outstanding folding
2197 // opportunities. Attempt to fold the expression using DataLayout as a
2198 // last resort before giving up.
2199 if (Constant *C = ConstantFoldConstant(CE, getDataLayout()))
2200 if (C != CE)
2201 return lowerConstant(C);
2202
2203 // Otherwise report the problem to the user.
2204 {
2205 std::string S;
2206 raw_string_ostream OS(S);
2207 OS << "Unsupported expression in static initializer: ";
2208 CE->printAsOperand(OS, /*PrintType=*/false,
2209 !MF ? nullptr : MF->getFunction().getParent());
2210 report_fatal_error(OS.str());
2211 }
2212 case Instruction::GetElementPtr: {
2213 // Generate a symbolic expression for the byte address
2214 APInt OffsetAI(getDataLayout().getPointerTypeSizeInBits(CE->getType()), 0);
2215 cast<GEPOperator>(CE)->accumulateConstantOffset(getDataLayout(), OffsetAI);
2216
2217 const MCExpr *Base = lowerConstant(CE->getOperand(0));
2218 if (!OffsetAI)
2219 return Base;
2220
2221 int64_t Offset = OffsetAI.getSExtValue();
2222 return MCBinaryExpr::createAdd(Base, MCConstantExpr::create(Offset, Ctx),
2223 Ctx);
2224 }
2225
2226 case Instruction::Trunc:
2227 // We emit the value and depend on the assembler to truncate the generated
2228 // expression properly. This is important for differences between
2229 // blockaddress labels. Since the two labels are in the same function, it
2230 // is reasonable to treat their delta as a 32-bit value.
2231 LLVM_FALLTHROUGH[[clang::fallthrough]];
2232 case Instruction::BitCast:
2233 return lowerConstant(CE->getOperand(0));
2234
2235 case Instruction::IntToPtr: {
2236 const DataLayout &DL = getDataLayout();
2237
2238 // Handle casts to pointers by changing them into casts to the appropriate
2239 // integer type. This promotes constant folding and simplifies this code.
2240 Constant *Op = CE->getOperand(0);
2241 Op = ConstantExpr::getIntegerCast(Op, DL.getIntPtrType(CV->getType()),
2242 false/*ZExt*/);
2243 return lowerConstant(Op);
2244 }
2245
2246 case Instruction::PtrToInt: {
2247 const DataLayout &DL = getDataLayout();
2248
2249 // Support only foldable casts to/from pointers that can be eliminated by
2250 // changing the pointer to the appropriately sized integer type.
2251 Constant *Op = CE->getOperand(0);
2252 Type *Ty = CE->getType();
2253
2254 const MCExpr *OpExpr = lowerConstant(Op);
2255
2256 // We can emit the pointer value into this slot if the slot is an
2257 // integer slot equal to the size of the pointer.
2258 //
2259 // If the pointer is larger than the resultant integer, then
2260 // as with Trunc just depend on the assembler to truncate it.
2261 if (DL.getTypeAllocSize(Ty) <= DL.getTypeAllocSize(Op->getType()))
2262 return OpExpr;
2263
2264 // Otherwise the pointer is smaller than the resultant integer, mask off
2265 // the high bits so we are sure to get a proper truncation if the input is
2266 // a constant expr.
2267 unsigned InBits = DL.getTypeAllocSizeInBits(Op->getType());
2268 const MCExpr *MaskExpr = MCConstantExpr::create(~0ULL >> (64-InBits), Ctx);
2269 return MCBinaryExpr::createAnd(OpExpr, MaskExpr, Ctx);
2270 }
2271
2272 case Instruction::Sub: {
2273 GlobalValue *LHSGV;
2274 APInt LHSOffset;
2275 if (IsConstantOffsetFromGlobal(CE->getOperand(0), LHSGV, LHSOffset,
2276 getDataLayout())) {
2277 GlobalValue *RHSGV;
2278 APInt RHSOffset;
2279 if (IsConstantOffsetFromGlobal(CE->getOperand(1), RHSGV, RHSOffset,
2280 getDataLayout())) {
2281 const MCExpr *RelocExpr =
2282 getObjFileLowering().lowerRelativeReference(LHSGV, RHSGV, TM);
2283 if (!RelocExpr)
2284 RelocExpr = MCBinaryExpr::createSub(
2285 MCSymbolRefExpr::create(getSymbol(LHSGV), Ctx),
2286 MCSymbolRefExpr::create(getSymbol(RHSGV), Ctx), Ctx);
2287 int64_t Addend = (LHSOffset - RHSOffset).getSExtValue();
2288 if (Addend != 0)
2289 RelocExpr = MCBinaryExpr::createAdd(
2290 RelocExpr, MCConstantExpr::create(Addend, Ctx), Ctx);
2291 return RelocExpr;
2292 }
2293 }
2294 }
2295 // else fallthrough
2296 LLVM_FALLTHROUGH[[clang::fallthrough]];
2297
2298 // The MC library also has a right-shift operator, but it isn't consistently
2299 // signed or unsigned between different targets.
2300 case Instruction::Add:
2301 case Instruction::Mul:
2302 case Instruction::SDiv:
2303 case Instruction::SRem:
2304 case Instruction::Shl:
2305 case Instruction::And:
2306 case Instruction::Or:
2307 case Instruction::Xor: {
2308 const MCExpr *LHS = lowerConstant(CE->getOperand(0));
2309 const MCExpr *RHS = lowerConstant(CE->getOperand(1));
2310 switch (CE->getOpcode()) {
2311 default: llvm_unreachable("Unknown binary operator constant cast expr")::llvm::llvm_unreachable_internal("Unknown binary operator constant cast expr"
, "/build/llvm-toolchain-snapshot-9~svn362543/lib/CodeGen/AsmPrinter/AsmPrinter.cpp"
, 2311)
;
2312 case Instruction::Add: return MCBinaryExpr::createAdd(LHS, RHS, Ctx);
2313 case Instruction::Sub: return MCBinaryExpr::createSub(LHS, RHS, Ctx);
2314 case Instruction::Mul: return MCBinaryExpr::createMul(LHS, RHS, Ctx);
2315 case Instruction::SDiv: return MCBinaryExpr::createDiv(LHS, RHS, Ctx);
2316 case Instruction::SRem: return MCBinaryExpr::createMod(LHS, RHS, Ctx);
2317 case Instruction::Shl: return MCBinaryExpr::createShl(LHS, RHS, Ctx);
2318 case Instruction::And: return MCBinaryExpr::createAnd(LHS, RHS, Ctx);
2319 case Instruction::Or: return MCBinaryExpr::createOr (LHS, RHS, Ctx);
2320 case Instruction::Xor: return MCBinaryExpr::createXor(LHS, RHS, Ctx);
2321 }
2322 }
2323 }
2324}
2325
2326static void emitGlobalConstantImpl(const DataLayout &DL, const Constant *C,
2327 AsmPrinter &AP,
2328 const Constant *BaseCV = nullptr,
2329 uint64_t Offset = 0);
2330
2331static void emitGlobalConstantFP(const ConstantFP *CFP, AsmPrinter &AP);
2332static void emitGlobalConstantFP(APFloat APF, Type *ET, AsmPrinter &AP);
2333
2334/// isRepeatedByteSequence - Determine whether the given value is
2335/// composed of a repeated sequence of identical bytes and return the
2336/// byte value. If it is not a repeated sequence, return -1.
2337static int isRepeatedByteSequence(const ConstantDataSequential *V) {
2338 StringRef Data = V->getRawDataValues();
2339 assert(!Data.empty() && "Empty aggregates should be CAZ node")((!Data.empty() && "Empty aggregates should be CAZ node"
) ? static_cast<void> (0) : __assert_fail ("!Data.empty() && \"Empty aggregates should be CAZ node\""
, "/build/llvm-toolchain-snapshot-9~svn362543/lib/CodeGen/AsmPrinter/AsmPrinter.cpp"
, 2339, __PRETTY_FUNCTION__))
;
2340 char C = Data[0];
2341 for (unsigned i = 1, e = Data.size(); i != e; ++i)
2342 if (Data[i] != C) return -1;
2343 return static_cast<uint8_t>(C); // Ensure 255 is not returned as -1.
2344}
2345
2346/// isRepeatedByteSequence - Determine whether the given value is
2347/// composed of a repeated sequence of identical bytes and return the
2348/// byte value. If it is not a repeated sequence, return -1.
2349static int isRepeatedByteSequence(const Value *V, const DataLayout &DL) {
2350 if (const ConstantInt *CI = dyn_cast<ConstantInt>(V)) {
2351 uint64_t Size = DL.getTypeAllocSizeInBits(V->getType());
2352 assert(Size % 8 == 0)((Size % 8 == 0) ? static_cast<void> (0) : __assert_fail
("Size % 8 == 0", "/build/llvm-toolchain-snapshot-9~svn362543/lib/CodeGen/AsmPrinter/AsmPrinter.cpp"
, 2352, __PRETTY_FUNCTION__))
;
2353
2354 // Extend the element to take zero padding into account.
2355 APInt Value = CI->getValue().zextOrSelf(Size);
2356 if (!Value.isSplat(8))
2357 return -1;
2358
2359 return Value.zextOrTrunc(8).getZExtValue();
2360 }
2361 if (const ConstantArray *CA = dyn_cast<ConstantArray>(V)) {
2362 // Make sure all array elements are sequences of the same repeated
2363 // byte.
2364 assert(CA->getNumOperands() != 0 && "Should be a CAZ")((CA->getNumOperands() != 0 && "Should be a CAZ") ?
static_cast<void> (0) : __assert_fail ("CA->getNumOperands() != 0 && \"Should be a CAZ\""
, "/build/llvm-toolchain-snapshot-9~svn362543/lib/CodeGen/AsmPrinter/AsmPrinter.cpp"
, 2364, __PRETTY_FUNCTION__))
;
2365 Constant *Op0 = CA->getOperand(0);
2366 int Byte = isRepeatedByteSequence(Op0, DL);
2367 if (Byte == -1)
2368 return -1;
2369
2370 // All array elements must be equal.
2371 for (unsigned i = 1, e = CA->getNumOperands(); i != e; ++i)
2372 if (CA->getOperand(i) != Op0)
2373 return -1;
2374 return Byte;
2375 }
2376
2377 if (const ConstantDataSequential *CDS = dyn_cast<ConstantDataSequential>(V))
2378 return isRepeatedByteSequence(CDS);
2379
2380 return -1;
2381}
2382
2383static void emitGlobalConstantDataSequential(const DataLayout &DL,
2384 const ConstantDataSequential *CDS,
2385 AsmPrinter &AP) {
2386 // See if we can aggregate this into a .fill, if so, emit it as such.
2387 int Value = isRepeatedByteSequence(CDS, DL);
2388 if (Value != -1) {
2389 uint64_t Bytes = DL.getTypeAllocSize(CDS->getType());
2390 // Don't emit a 1-byte object as a .fill.
2391 if (Bytes > 1)
2392 return AP.OutStreamer->emitFill(Bytes, Value);
2393 }
2394
2395 // If this can be emitted with .ascii/.asciz, emit it as such.
2396 if (CDS->isString())
2397 return AP.OutStreamer->EmitBytes(CDS->getAsString());
2398
2399 // Otherwise, emit the values in successive locations.
2400 unsigned ElementByteSize = CDS->getElementByteSize();
2401 if (isa<IntegerType>(CDS->getElementType())) {
2402 for (unsigned i = 0, e = CDS->getNumElements(); i != e; ++i) {
2403 if (AP.isVerbose())
2404 AP.OutStreamer->GetCommentOS() << format("0x%" PRIx64"l" "x" "\n",
2405 CDS->getElementAsInteger(i));
2406 AP.OutStreamer->EmitIntValue(CDS->getElementAsInteger(i),
2407 ElementByteSize);
2408 }
2409 } else {
2410 Type *ET = CDS->getElementType();
2411 for (unsigned I = 0, E = CDS->getNumElements(); I != E; ++I)
2412 emitGlobalConstantFP(CDS->getElementAsAPFloat(I), ET, AP);
2413 }
2414
2415 unsigned Size = DL.getTypeAllocSize(CDS->getType());
2416 unsigned EmittedSize = DL.getTypeAllocSize(CDS->getType()->getElementType()) *
2417 CDS->getNumElements();
2418 assert(EmittedSize <= Size && "Size cannot be less than EmittedSize!")((EmittedSize <= Size && "Size cannot be less than EmittedSize!"
) ? static_cast<void> (0) : __assert_fail ("EmittedSize <= Size && \"Size cannot be less than EmittedSize!\""
, "/build/llvm-toolchain-snapshot-9~svn362543/lib/CodeGen/AsmPrinter/AsmPrinter.cpp"
, 2418, __PRETTY_FUNCTION__))
;
2419 if (unsigned Padding = Size - EmittedSize)
2420 AP.OutStreamer->EmitZeros(Padding);
2421}
2422
2423static void emitGlobalConstantArray(const DataLayout &DL,
2424 const ConstantArray *CA, AsmPrinter &AP,
2425 const Constant *BaseCV, uint64_t Offset) {
2426 // See if we can aggregate some values. Make sure it can be
2427 // represented as a series of bytes of the constant value.
2428 int Value = isRepeatedByteSequence(CA, DL);
2429
2430 if (Value != -1) {
2431 uint64_t Bytes = DL.getTypeAllocSize(CA->getType());
2432 AP.OutStreamer->emitFill(Bytes, Value);
2433 }
2434 else {
2435 for (unsigned i = 0, e = CA->getNumOperands(); i != e; ++i) {
2436 emitGlobalConstantImpl(DL, CA->getOperand(i), AP, BaseCV, Offset);
2437 Offset += DL.getTypeAllocSize(CA->getOperand(i)->getType());
2438 }
2439 }
2440}
2441
2442static void emitGlobalConstantVector(const DataLayout &DL,
2443 const ConstantVector *CV, AsmPrinter &AP) {
2444 for (unsigned i = 0, e = CV->getType()->getNumElements(); i != e; ++i)
2445 emitGlobalConstantImpl(DL, CV->getOperand(i), AP);
2446
2447 unsigned Size = DL.getTypeAllocSize(CV->getType());
2448 unsigned EmittedSize = DL.getTypeAllocSize(CV->getType()->getElementType()) *
2449 CV->getType()->getNumElements();
2450 if (unsigned Padding = Size - EmittedSize)
2451 AP.OutStreamer->EmitZeros(Padding);
2452}
2453
2454static void emitGlobalConstantStruct(const DataLayout &DL,
2455 const ConstantStruct *CS, AsmPrinter &AP,
2456 const Constant *BaseCV, uint64_t Offset) {
2457 // Print the fields in successive locations. Pad to align if needed!
2458 unsigned Size = DL.getTypeAllocSize(CS->getType());
2459 const StructLayout *Layout = DL.getStructLayout(CS->getType());
2460 uint64_t SizeSoFar = 0;
2461 for (unsigned i = 0, e = CS->getNumOperands(); i != e; ++i) {
2462 const Constant *Field = CS->getOperand(i);
2463
2464 // Print the actual field value.
2465 emitGlobalConstantImpl(DL, Field, AP, BaseCV, Offset + SizeSoFar);
2466
2467 // Check if padding is needed and insert one or more 0s.
2468 uint64_t FieldSize = DL.getTypeAllocSize(Field->getType());
2469 uint64_t PadSize = ((i == e-1 ? Size : Layout->getElementOffset(i+1))
2470 - Layout->getElementOffset(i)) - FieldSize;
2471 SizeSoFar += FieldSize + PadSize;
2472
2473 // Insert padding - this may include padding to increase the size of the
2474 // current field up to the ABI size (if the struct is not packed) as well
2475 // as padding to ensure that the next field starts at the right offset.
2476 AP.OutStreamer->EmitZeros(PadSize);
2477 }
2478 assert(SizeSoFar == Layout->getSizeInBytes() &&((SizeSoFar == Layout->getSizeInBytes() && "Layout of constant struct may be incorrect!"
) ? static_cast<void> (0) : __assert_fail ("SizeSoFar == Layout->getSizeInBytes() && \"Layout of constant struct may be incorrect!\""
, "/build/llvm-toolchain-snapshot-9~svn362543/lib/CodeGen/AsmPrinter/AsmPrinter.cpp"
, 2479, __PRETTY_FUNCTION__))
2479 "Layout of constant struct may be incorrect!")((SizeSoFar == Layout->getSizeInBytes() && "Layout of constant struct may be incorrect!"
) ? static_cast<void> (0) : __assert_fail ("SizeSoFar == Layout->getSizeInBytes() && \"Layout of constant struct may be incorrect!\""
, "/build/llvm-toolchain-snapshot-9~svn362543/lib/CodeGen/AsmPrinter/AsmPrinter.cpp"
, 2479, __PRETTY_FUNCTION__))
;
2480}
2481
2482static void emitGlobalConstantFP(APFloat APF, Type *ET, AsmPrinter &AP) {
2483 APInt API = APF.bitcastToAPInt();
2484
2485 // First print a comment with what we think the original floating-point value
2486 // should have been.
2487 if (AP.isVerbose()) {
28
Assuming the condition is true
29
Taking true branch
2488 SmallString<8> StrVal;
2489 APF.toString(StrVal);
2490
2491 if (ET)
30
Assuming 'ET' is null
31
Assuming pointer value is null
32
Taking false branch
2492 ET->print(AP.OutStreamer->GetCommentOS());
2493 else
2494 AP.OutStreamer->GetCommentOS() << "Printing <null> Type";
2495 AP.OutStreamer->GetCommentOS() << ' ' << StrVal << '\n';
2496 }
2497
2498 // Now iterate through the APInt chunks, emitting them in endian-correct
2499 // order, possibly with a smaller chunk at beginning/end (e.g. for x87 80-bit
2500 // floats).
2501 unsigned NumBytes = API.getBitWidth() / 8;
2502 unsigned TrailingBytes = NumBytes % sizeof(uint64_t);
2503 const uint64_t *p = API.getRawData();
2504
2505 // PPC's long double has odd notions of endianness compared to how LLVM
2506 // handles it: p[0] goes first for *big* endian on PPC.
2507 if (AP.getDataLayout().isBigEndian() && !ET->isPPC_FP128Ty()) {
33
Assuming the condition is true
34
Called C++ object pointer is null
2508 int Chunk = API.getNumWords() - 1;
2509
2510 if (TrailingBytes)
2511 AP.OutStreamer->EmitIntValue(p[Chunk--], TrailingBytes);
2512
2513 for (; Chunk >= 0; --Chunk)
2514 AP.OutStreamer->EmitIntValue(p[Chunk], sizeof(uint64_t));
2515 } else {
2516 unsigned Chunk;
2517 for (Chunk = 0; Chunk < NumBytes / sizeof(uint64_t); ++Chunk)
2518 AP.OutStreamer->EmitIntValue(p[Chunk], sizeof(uint64_t));
2519
2520 if (TrailingBytes)
2521 AP.OutStreamer->EmitIntValue(p[Chunk], TrailingBytes);
2522 }
2523
2524 // Emit the tail padding for the long double.
2525 const DataLayout &DL = AP.getDataLayout();
2526 AP.OutStreamer->EmitZeros(DL.getTypeAllocSize(ET) - DL.getTypeStoreSize(ET));
2527}
2528
2529static void emitGlobalConstantFP(const ConstantFP *CFP, AsmPrinter &AP) {
2530 emitGlobalConstantFP(CFP->getValueAPF(), CFP->getType(), AP);
23
Calling 'Value::getType'
25
Returning from 'Value::getType'
26
Passing value via 2nd parameter 'ET'
27
Calling 'emitGlobalConstantFP'
2531}
2532
2533static void emitGlobalConstantLargeInt(const ConstantInt *CI, AsmPrinter &AP) {
2534 const DataLayout &DL = AP.getDataLayout();
2535 unsigned BitWidth = CI->getBitWidth();
2536
2537 // Copy the value as we may massage the layout for constants whose bit width
2538 // is not a multiple of 64-bits.
2539 APInt Realigned(CI->getValue());
2540 uint64_t ExtraBits = 0;
2541 unsigned ExtraBitsSize = BitWidth & 63;
2542
2543 if (ExtraBitsSize) {
2544 // The bit width of the data is not a multiple of 64-bits.
2545 // The extra bits are expected to be at the end of the chunk of the memory.
2546 // Little endian:
2547 // * Nothing to be done, just record the extra bits to emit.
2548 // Big endian:
2549 // * Record the extra bits to emit.
2550 // * Realign the raw data to emit the chunks of 64-bits.
2551 if (DL.isBigEndian()) {
2552 // Basically the structure of the raw data is a chunk of 64-bits cells:
2553 // 0 1 BitWidth / 64
2554 // [chunk1][chunk2] ... [chunkN].
2555 // The most significant chunk is chunkN and it should be emitted first.
2556 // However, due to the alignment issue chunkN contains useless bits.
2557 // Realign the chunks so that they contain only useless information:
2558 // ExtraBits 0 1 (BitWidth / 64) - 1
2559 // chu[nk1 chu][nk2 chu] ... [nkN-1 chunkN]
2560 ExtraBits = Realigned.getRawData()[0] &
2561 (((uint64_t)-1) >> (64 - ExtraBitsSize));
2562 Realigned.lshrInPlace(ExtraBitsSize);
2563 } else
2564 ExtraBits = Realigned.getRawData()[BitWidth / 64];
2565 }
2566
2567 // We don't expect assemblers to support integer data directives
2568 // for more than 64 bits, so we emit the data in at most 64-bit
2569 // quantities at a time.
2570 const uint64_t *RawData = Realigned.getRawData();
2571 for (unsigned i = 0, e = BitWidth / 64; i != e; ++i) {
2572 uint64_t Val = DL.isBigEndian() ? RawData[e - i - 1] : RawData[i];
2573 AP.OutStreamer->EmitIntValue(Val, 8);
2574 }
2575
2576 if (ExtraBitsSize) {
2577 // Emit the extra bits after the 64-bits chunks.
2578
2579 // Emit a directive that fills the expected size.
2580 uint64_t Size = AP.getDataLayout().getTypeAllocSize(CI->getType());
2581 Size -= (BitWidth / 64) * 8;
2582 assert(Size && Size * 8 >= ExtraBitsSize &&((Size && Size * 8 >= ExtraBitsSize && (ExtraBits
& (((uint64_t)-1) >> (64 - ExtraBitsSize))) == ExtraBits
&& "Directive too small for extra bits.") ? static_cast
<void> (0) : __assert_fail ("Size && Size * 8 >= ExtraBitsSize && (ExtraBits & (((uint64_t)-1) >> (64 - ExtraBitsSize))) == ExtraBits && \"Directive too small for extra bits.\""
, "/build/llvm-toolchain-snapshot-9~svn362543/lib/CodeGen/AsmPrinter/AsmPrinter.cpp"
, 2584, __PRETTY_FUNCTION__))
2583 (ExtraBits & (((uint64_t)-1) >> (64 - ExtraBitsSize)))((Size && Size * 8 >= ExtraBitsSize && (ExtraBits
& (((uint64_t)-1) >> (64 - ExtraBitsSize))) == ExtraBits
&& "Directive too small for extra bits.") ? static_cast
<void> (0) : __assert_fail ("Size && Size * 8 >= ExtraBitsSize && (ExtraBits & (((uint64_t)-1) >> (64 - ExtraBitsSize))) == ExtraBits && \"Directive too small for extra bits.\""
, "/build/llvm-toolchain-snapshot-9~svn362543/lib/CodeGen/AsmPrinter/AsmPrinter.cpp"
, 2584, __PRETTY_FUNCTION__))
2584 == ExtraBits && "Directive too small for extra bits.")((Size && Size * 8 >= ExtraBitsSize && (ExtraBits
& (((uint64_t)-1) >> (64 - ExtraBitsSize))) == ExtraBits
&& "Directive too small for extra bits.") ? static_cast
<void> (0) : __assert_fail ("Size && Size * 8 >= ExtraBitsSize && (ExtraBits & (((uint64_t)-1) >> (64 - ExtraBitsSize))) == ExtraBits && \"Directive too small for extra bits.\""
, "/build/llvm-toolchain-snapshot-9~svn362543/lib/CodeGen/AsmPrinter/AsmPrinter.cpp"
, 2584, __PRETTY_FUNCTION__))
;
2585 AP.OutStreamer->EmitIntValue(ExtraBits, Size);
2586 }
2587}
2588
2589/// Transform a not absolute MCExpr containing a reference to a GOT
2590/// equivalent global, by a target specific GOT pc relative access to the
2591/// final symbol.
2592static void handleIndirectSymViaGOTPCRel(AsmPrinter &AP, const MCExpr **ME,
2593 const Constant *BaseCst,
2594 uint64_t Offset) {
2595 // The global @foo below illustrates a global that uses a got equivalent.
2596 //
2597 // @bar = global i32 42
2598 // @gotequiv = private unnamed_addr constant i32* @bar
2599 // @foo = i32 trunc (i64 sub (i64 ptrtoint (i32** @gotequiv to i64),
2600 // i64 ptrtoint (i32* @foo to i64))
2601 // to i32)
2602 //
2603 // The cstexpr in @foo is converted into the MCExpr `ME`, where we actually
2604 // check whether @foo is suitable to use a GOTPCREL. `ME` is usually in the
2605 // form:
2606 //
2607 // foo = cstexpr, where
2608 // cstexpr := <gotequiv> - "." + <cst>
2609 // cstexpr := <gotequiv> - (<foo> - <offset from @foo base>) + <cst>
2610 //
2611 // After canonicalization by evaluateAsRelocatable `ME` turns into:
2612 //
2613 // cstexpr := <gotequiv> - <foo> + gotpcrelcst, where
2614 // gotpcrelcst := <offset from @foo base> + <cst>
2615 MCValue MV;
2616 if (!(*ME)->evaluateAsRelocatable(MV, nullptr, nullptr) || MV.isAbsolute())
2617 return;
2618 const MCSymbolRefExpr *SymA = MV.getSymA();
2619 if (!SymA)
2620 return;
2621
2622 // Check that GOT equivalent symbol is cached.
2623 const MCSymbol *GOTEquivSym = &SymA->getSymbol();
2624 if (!AP.GlobalGOTEquivs.count(GOTEquivSym))
2625 return;
2626
2627 const GlobalValue *BaseGV = dyn_cast_or_null<GlobalValue>(BaseCst);
2628 if (!BaseGV)
2629 return;
2630
2631 // Check for a valid base symbol
2632 const MCSymbol *BaseSym = AP.getSymbol(BaseGV);
2633 const MCSymbolRefExpr *SymB = MV.getSymB();
2634
2635 if (!SymB || BaseSym != &SymB->getSymbol())
2636 return;
2637
2638 // Make sure to match:
2639 //
2640 // gotpcrelcst := <offset from @foo base> + <cst>
2641 //
2642 // If gotpcrelcst is positive it means that we can safely fold the pc rel
2643 // displacement into the GOTPCREL. We can also can have an extra offset <cst>
2644 // if the target knows how to encode it.
2645 int64_t GOTPCRelCst = Offset + MV.getConstant();
2646 if (GOTPCRelCst < 0)
2647 return;
2648 if (!AP.getObjFileLowering().supportGOTPCRelWithOffset() && GOTPCRelCst != 0)
2649 return;
2650
2651 // Emit the GOT PC relative to replace the got equivalent global, i.e.:
2652 //
2653 // bar:
2654 // .long 42
2655 // gotequiv:
2656 // .quad bar
2657 // foo:
2658 // .long gotequiv - "." + <cst>
2659 //
2660 // is replaced by the target specific equivalent to:
2661 //
2662 // bar:
2663 // .long 42
2664 // foo:
2665 // .long bar@GOTPCREL+<gotpcrelcst>
2666 AsmPrinter::GOTEquivUsePair Result = AP.GlobalGOTEquivs[GOTEquivSym];
2667 const GlobalVariable *GV = Result.first;
2668 int NumUses = (int)Result.second;
2669 const GlobalValue *FinalGV = dyn_cast<GlobalValue>(GV->getOperand(0));
2670 const MCSymbol *FinalSym = AP.getSymbol(FinalGV);
2671 *ME = AP.getObjFileLowering().getIndirectSymViaGOTPCRel(
2672 FinalSym, MV, Offset, AP.MMI, *AP.OutStreamer);
2673
2674 // Update GOT equivalent usage information
2675 --NumUses;
2676 if (NumUses >= 0)
2677 AP.GlobalGOTEquivs[GOTEquivSym] = std::make_pair(GV, NumUses);
2678}
2679
2680static void emitGlobalConstantImpl(const DataLayout &DL, const Constant *CV,
2681 AsmPrinter &AP, const Constant *BaseCV,
2682 uint64_t Offset) {
2683 uint64_t Size = DL.getTypeAllocSize(CV->getType());
2684
2685 // Globals with sub-elements such as combinations of arrays and structs
2686 // are handled recursively by emitGlobalConstantImpl. Keep track of the
2687 // constant symbol base and the current position with BaseCV and Offset.
2688 if (!BaseCV && CV->hasOneUse())
17
Taking false branch
2689 BaseCV = dyn_cast<Constant>(CV->user_back());
2690
2691 if (isa<ConstantAggregateZero>(CV) || isa<UndefValue>(CV))
18
Taking false branch
2692 return AP.OutStreamer->EmitZeros(Size);
2693
2694 if (const ConstantInt *CI = dyn_cast<ConstantInt>(CV)) {
19
Taking false branch
2695 switch (Size) {
2696 case 1:
2697 case 2:
2698 case 4:
2699 case 8:
2700 if (AP.isVerbose())
2701 AP.OutStreamer->GetCommentOS() << format("0x%" PRIx64"l" "x" "\n",
2702 CI->getZExtValue());
2703 AP.OutStreamer->EmitIntValue(CI->getZExtValue(), Size);
2704 return;
2705 default:
2706 emitGlobalConstantLargeInt(CI, AP);
2707 return;
2708 }
2709 }
2710
2711 if (const ConstantFP *CFP = dyn_cast<ConstantFP>(CV))
20
Assuming 'CFP' is non-null
21
Taking true branch
2712 return emitGlobalConstantFP(CFP, AP);
22
Calling 'emitGlobalConstantFP'
2713
2714 if (isa<ConstantPointerNull>(CV)) {
2715 AP.OutStreamer->EmitIntValue(0, Size);
2716 return;
2717 }
2718
2719 if (const ConstantDataSequential *CDS = dyn_cast<ConstantDataSequential>(CV))
2720 return emitGlobalConstantDataSequential(DL, CDS, AP);
2721
2722 if (const ConstantArray *CVA = dyn_cast<ConstantArray>(CV))
2723 return emitGlobalConstantArray(DL, CVA, AP, BaseCV, Offset);
2724
2725 if (const ConstantStruct *CVS = dyn_cast<ConstantStruct>(CV))
2726 return emitGlobalConstantStruct(DL, CVS, AP, BaseCV, Offset);
2727
2728 if (const ConstantExpr *CE = dyn_cast<ConstantExpr>(CV)) {
2729 // Look through bitcasts, which might not be able to be MCExpr'ized (e.g. of
2730 // vectors).
2731 if (CE->getOpcode() == Instruction::BitCast)
2732 return emitGlobalConstantImpl(DL, CE->getOperand(0), AP);
2733
2734 if (Size > 8) {
2735 // If the constant expression's size is greater than 64-bits, then we have
2736 // to emit the value in chunks. Try to constant fold the value and emit it
2737 // that way.
2738 Constant *New = ConstantFoldConstant(CE, DL);
2739 if (New && New != CE)
2740 return emitGlobalConstantImpl(DL, New, AP);
2741 }
2742 }
2743
2744 if (const ConstantVector *V = dyn_cast<ConstantVector>(CV))
2745 return emitGlobalConstantVector(DL, V, AP);
2746
2747 // Otherwise, it must be a ConstantExpr. Lower it to an MCExpr, then emit it
2748 // thread the streamer with EmitValue.
2749 const MCExpr *ME = AP.lowerConstant(CV);
2750
2751 // Since lowerConstant already folded and got rid of all IR pointer and
2752 // integer casts, detect GOT equivalent accesses by looking into the MCExpr
2753 // directly.
2754 if (AP.getObjFileLowering().supportIndirectSymViaGOTPCRel())
2755 handleIndirectSymViaGOTPCRel(AP, &ME, BaseCV, Offset);
2756
2757 AP.OutStreamer->EmitValue(ME, Size);
2758}
2759
2760/// EmitGlobalConstant - Print a general LLVM constant to the .s file.
2761void AsmPrinter::EmitGlobalConstant(const DataLayout &DL, const Constant *CV) {
2762 uint64_t Size = DL.getTypeAllocSize(CV->getType());
2763 if (Size)
14
Assuming 'Size' is not equal to 0
15
Taking true branch
2764 emitGlobalConstantImpl(DL, CV, *this);
16
Calling 'emitGlobalConstantImpl'
2765 else if (MAI->hasSubsectionsViaSymbols()) {
2766 // If the global has zero size, emit a single byte so that two labels don't
2767 // look like they are at the same location.
2768 OutStreamer->EmitIntValue(0, 1);
2769 }
2770}
2771
2772void AsmPrinter::EmitMachineConstantPoolValue(MachineConstantPoolValue *MCPV) {
2773 // Target doesn't support this yet!
2774 llvm_unreachable("Target does not support EmitMachineConstantPoolValue")::llvm::llvm_unreachable_internal("Target does not support EmitMachineConstantPoolValue"
, "/build/llvm-toolchain-snapshot-9~svn362543/lib/CodeGen/AsmPrinter/AsmPrinter.cpp"
, 2774)
;
2775}
2776
2777void AsmPrinter::printOffset(int64_t Offset, raw_ostream &OS) const {
2778 if (Offset > 0)
2779 OS << '+' << Offset;
2780 else if (Offset < 0)
2781 OS << Offset;
2782}
2783
2784//===----------------------------------------------------------------------===//
2785// Symbol Lowering Routines.
2786//===----------------------------------------------------------------------===//
2787
2788MCSymbol *AsmPrinter::createTempSymbol(const Twine &Name) const {
2789 return OutContext.createTempSymbol(Name, true);
2790}
2791
2792MCSymbol *AsmPrinter::GetBlockAddressSymbol(const BlockAddress *BA) const {
2793 return MMI->getAddrLabelSymbol(BA->getBasicBlock());
2794}
2795
2796MCSymbol *AsmPrinter::GetBlockAddressSymbol(const BasicBlock *BB) const {
2797 return MMI->getAddrLabelSymbol(BB);
2798}
2799
2800/// GetCPISymbol - Return the symbol for the specified constant pool entry.
2801MCSymbol *AsmPrinter::GetCPISymbol(unsigned CPID) const {
2802 if (getSubtargetInfo().getTargetTriple().isKnownWindowsMSVCEnvironment()) {
2803 const MachineConstantPoolEntry &CPE =
2804 MF->getConstantPool()->getConstants()[CPID];
2805 if (!CPE.isMachineConstantPoolEntry()) {
2806 const DataLayout &DL = MF->getDataLayout();
2807 SectionKind Kind = CPE.getSectionKind(&DL);
2808 const Constant *C = CPE.Val.ConstVal;
2809 unsigned Align = CPE.Alignment;
2810 if (const MCSectionCOFF *S = dyn_cast<MCSectionCOFF>(
2811 getObjFileLowering().getSectionForConstant(DL, Kind, C, Align))) {
2812 if (MCSymbol *Sym = S->getCOMDATSymbol()) {
2813 if (Sym->isUndefined())
2814 OutStreamer->EmitSymbolAttribute(Sym, MCSA_Global);
2815 return Sym;
2816 }
2817 }
2818 }
2819 }
2820
2821 const DataLayout &DL = getDataLayout();
2822 return OutContext.getOrCreateSymbol(Twine(DL.getPrivateGlobalPrefix()) +
2823 "CPI" + Twine(getFunctionNumber()) + "_" +
2824 Twine(CPID));
2825}
2826
2827/// GetJTISymbol - Return the symbol for the specified jump table entry.
2828MCSymbol *AsmPrinter::GetJTISymbol(unsigned JTID, bool isLinkerPrivate) const {
2829 return MF->getJTISymbol(JTID, OutContext, isLinkerPrivate);
2830}
2831
2832/// GetJTSetSymbol - Return the symbol for the specified jump table .set
2833/// FIXME: privatize to AsmPrinter.
2834MCSymbol *AsmPrinter::GetJTSetSymbol(unsigned UID, unsigned MBBID) const {
2835 const DataLayout &DL = getDataLayout();
2836 return OutContext.getOrCreateSymbol(Twine(DL.getPrivateGlobalPrefix()) +
2837 Twine(getFunctionNumber()) + "_" +
2838 Twine(UID) + "_set_" + Twine(MBBID));
2839}
2840
2841MCSymbol *AsmPrinter::getSymbolWithGlobalValueBase(const GlobalValue *GV,
2842 StringRef Suffix) const {
2843 return getObjFileLowering().getSymbolWithGlobalValueBase(GV, Suffix, TM);
2844}
2845
2846/// Return the MCSymbol for the specified ExternalSymbol.
2847MCSymbol *AsmPrinter::GetExternalSymbolSymbol(StringRef Sym) const {
2848 SmallString<60> NameStr;
2849 Mangler::getNameWithPrefix(NameStr, Sym, getDataLayout());
2850 return OutContext.getOrCreateSymbol(NameStr);
2851}
2852
2853/// PrintParentLoopComment - Print comments about parent loops of this one.
2854static void PrintParentLoopComment(raw_ostream &OS, const MachineLoop *Loop,
2855 unsigned FunctionNumber) {
2856 if (!Loop) return;
2857 PrintParentLoopComment(OS, Loop->getParentLoop(), FunctionNumber);
2858 OS.indent(Loop->getLoopDepth()*2)
2859 << "Parent Loop BB" << FunctionNumber << "_"
2860 << Loop->getHeader()->getNumber()
2861 << " Depth=" << Loop->getLoopDepth() << '\n';
2862}
2863
2864/// PrintChildLoopComment - Print comments about child loops within
2865/// the loop for this basic block, with nesting.
2866static void PrintChildLoopComment(raw_ostream &OS, const MachineLoop *Loop,
2867 unsigned FunctionNumber) {
2868 // Add child loop information
2869 for (const MachineLoop *CL : *Loop) {
2870 OS.indent(CL->getLoopDepth()*2)
2871 << "Child Loop BB" << FunctionNumber << "_"
2872 << CL->getHeader()->getNumber() << " Depth " << CL->getLoopDepth()
2873 << '\n';
2874 PrintChildLoopComment(OS, CL, FunctionNumber);
2875 }
2876}
2877
2878/// emitBasicBlockLoopComments - Pretty-print comments for basic blocks.
2879static void emitBasicBlockLoopComments(const MachineBasicBlock &MBB,
2880 const MachineLoopInfo *LI,
2881 const AsmPrinter &AP) {
2882 // Add loop depth information
2883 const MachineLoop *Loop = LI->getLoopFor(&MBB);
2884 if (!Loop) return;
2885
2886 MachineBasicBlock *Header = Loop->getHeader();
2887 assert(Header && "No header for loop")((Header && "No header for loop") ? static_cast<void
> (0) : __assert_fail ("Header && \"No header for loop\""
, "/build/llvm-toolchain-snapshot-9~svn362543/lib/CodeGen/AsmPrinter/AsmPrinter.cpp"
, 2887, __PRETTY_FUNCTION__))
;
2888
2889 // If this block is not a loop header, just print out what is the loop header
2890 // and return.
2891 if (Header != &MBB) {
2892 AP.OutStreamer->AddComment(" in Loop: Header=BB" +
2893 Twine(AP.getFunctionNumber())+"_" +
2894 Twine(Loop->getHeader()->getNumber())+
2895 " Depth="+Twine(Loop->getLoopDepth()));
2896 return;
2897 }
2898
2899 // Otherwise, it is a loop header. Print out information about child and
2900 // parent loops.
2901 raw_ostream &OS = AP.OutStreamer->GetCommentOS();
2902
2903 PrintParentLoopComment(OS, Loop->getParentLoop(), AP.getFunctionNumber());
2904
2905 OS << "=>";
2906 OS.indent(Loop->getLoopDepth()*2-2);
2907
2908 OS << "This ";
2909 if (Loop->empty())
2910 OS << "Inner ";
2911 OS << "Loop Header: Depth=" + Twine(Loop->getLoopDepth()) << '\n';
2912
2913 PrintChildLoopComment(OS, Loop, AP.getFunctionNumber());
2914}
2915
2916void AsmPrinter::setupCodePaddingContext(const MachineBasicBlock &MBB,
2917 MCCodePaddingContext &Context) const {
2918 assert(MF != nullptr && "Machine function must be valid")((MF != nullptr && "Machine function must be valid") ?
static_cast<void> (0) : __assert_fail ("MF != nullptr && \"Machine function must be valid\""
, "/build/llvm-toolchain-snapshot-9~svn362543/lib/CodeGen/AsmPrinter/AsmPrinter.cpp"
, 2918, __PRETTY_FUNCTION__))
;
2919 Context.IsPaddingActive = !MF->hasInlineAsm() &&
2920 !MF->getFunction().hasOptSize() &&
2921 TM.getOptLevel() != CodeGenOpt::None;
2922 Context.IsBasicBlockReachableViaFallthrough =
2923 std::find(MBB.pred_begin(), MBB.pred_end(), MBB.getPrevNode()) !=
2924 MBB.pred_end();
2925 Context.IsBasicBlockReachableViaBranch =
2926 MBB.pred_size() > 0 && !isBlockOnlyReachableByFallthrough(&MBB);
2927}
2928
2929/// EmitBasicBlockStart - This method prints the label for the specified
2930/// MachineBasicBlock, an alignment (if present) and a comment describing
2931/// it if appropriate.
2932void AsmPrinter::EmitBasicBlockStart(const MachineBasicBlock &MBB) const {
2933 // End the previous funclet and start a new one.
2934 if (MBB.isEHFuncletEntry()) {
2935 for (const HandlerInfo &HI : Handlers) {
2936 HI.Handler->endFunclet();
2937 HI.Handler->beginFunclet(MBB);
2938 }
2939 }
2940
2941 // Emit an alignment directive for this block, if needed.
2942 if (unsigned Align = MBB.getAlignment())
2943 EmitAlignment(Align);
2944 MCCodePaddingContext Context;
2945 setupCodePaddingContext(MBB, Context);
2946 OutStreamer->EmitCodePaddingBasicBlockStart(Context);
2947
2948 // If the block has its address taken, emit any labels that were used to
2949 // reference the block. It is possible that there is more than one label
2950 // here, because multiple LLVM BB's may have been RAUW'd to this block after
2951 // the references were generated.
2952 if (MBB.hasAddressTaken()) {
2953 const BasicBlock *BB = MBB.getBasicBlock();
2954 if (isVerbose())
2955 OutStreamer->AddComment("Block address taken");
2956
2957 // MBBs can have their address taken as part of CodeGen without having
2958 // their corresponding BB's address taken in IR
2959 if (BB->hasAddressTaken())
2960 for (MCSymbol *Sym : MMI->getAddrLabelSymbolToEmit(BB))
2961 OutStreamer->EmitLabel(Sym);
2962 }
2963
2964 // Print some verbose block comments.
2965 if (isVerbose()) {
2966 if (const BasicBlock *BB = MBB.getBasicBlock()) {
2967 if (BB->hasName()) {
2968 BB->printAsOperand(OutStreamer->GetCommentOS(),
2969 /*PrintType=*/false, BB->getModule());
2970 OutStreamer->GetCommentOS() << '\n';
2971 }
2972 }
2973
2974 assert(MLI != nullptr && "MachineLoopInfo should has been computed")((MLI != nullptr && "MachineLoopInfo should has been computed"
) ? static_cast<void> (0) : __assert_fail ("MLI != nullptr && \"MachineLoopInfo should has been computed\""
, "/build/llvm-toolchain-snapshot-9~svn362543/lib/CodeGen/AsmPrinter/AsmPrinter.cpp"
, 2974, __PRETTY_FUNCTION__))
;
2975 emitBasicBlockLoopComments(MBB, MLI, *this);
2976 }
2977
2978 // Print the main label for the block.
2979 if (MBB.pred_empty() ||
2980 (isBlockOnlyReachableByFallthrough(&MBB) && !MBB.isEHFuncletEntry() &&
2981 !MBB.hasLabelMustBeEmitted())) {
2982 if (isVerbose()) {
2983 // NOTE: Want this comment at start of line, don't emit with AddComment.
2984 OutStreamer->emitRawComment(" %bb." + Twine(MBB.getNumber()) + ":",
2985 false);
2986 }
2987 } else {
2988 if (isVerbose() && MBB.hasLabelMustBeEmitted())
2989 OutStreamer->AddComment("Label of block must be emitted");
2990 OutStreamer->EmitLabel(MBB.getSymbol());
2991 }
2992}
2993
2994void AsmPrinter::EmitBasicBlockEnd(const MachineBasicBlock &MBB) {
2995 MCCodePaddingContext Context;
2996 setupCodePaddingContext(MBB, Context);
2997 OutStreamer->EmitCodePaddingBasicBlockEnd(Context);
2998}
2999
3000void AsmPrinter::EmitVisibility(MCSymbol *Sym, unsigned Visibility,
3001 bool IsDefinition) const {
3002 MCSymbolAttr Attr = MCSA_Invalid;
3003
3004 switch (Visibility) {
3005 default: break;
3006 case GlobalValue::HiddenVisibility:
3007 if (IsDefinition)
3008 Attr = MAI->getHiddenVisibilityAttr();
3009 else
3010 Attr = MAI->getHiddenDeclarationVisibilityAttr();
3011 break;
3012 case GlobalValue::ProtectedVisibility:
3013 Attr = MAI->getProtectedVisibilityAttr();
3014 break;
3015 }
3016
3017 if (Attr != MCSA_Invalid)
3018 OutStreamer->EmitSymbolAttribute(Sym, Attr);
3019}
3020
3021/// isBlockOnlyReachableByFallthough - Return true if the basic block has
3022/// exactly one predecessor and the control transfer mechanism between
3023/// the predecessor and this block is a fall-through.
3024bool AsmPrinter::
3025isBlockOnlyReachableByFallthrough(const MachineBasicBlock *MBB) const {
3026 // If this is a landing pad, it isn't a fall through. If it has no preds,
3027 // then nothing falls through to it.
3028 if (MBB->isEHPad() || MBB->pred_empty())
3029 return false;
3030
3031 // If there isn't exactly one predecessor, it can't be a fall through.
3032 if (MBB->pred_size() > 1)
3033 return false;
3034
3035 // The predecessor has to be immediately before this block.
3036 MachineBasicBlock *Pred = *MBB->pred_begin();
3037 if (!Pred->isLayoutSuccessor(MBB))
3038 return false;
3039
3040 // If the block is completely empty, then it definitely does fall through.
3041 if (Pred->empty())
3042 return true;
3043
3044 // Check the terminators in the previous blocks
3045 for (const auto &MI : Pred->terminators()) {
3046 // If it is not a simple branch, we are in a table somewhere.
3047 if (!MI.isBranch() || MI.isIndirectBranch())
3048 return false;
3049
3050 // If we are the operands of one of the branches, this is not a fall
3051 // through. Note that targets with delay slots will usually bundle
3052 // terminators with the delay slot instruction.
3053 for (ConstMIBundleOperands OP(MI); OP.isValid(); ++OP) {
3054 if (OP->isJTI())
3055 return false;
3056 if (OP->isMBB() && OP->getMBB() == MBB)
3057 return false;
3058 }
3059 }
3060
3061 return true;
3062}
3063
3064GCMetadataPrinter *AsmPrinter::GetOrCreateGCPrinter(GCStrategy &S) {
3065 if (!S.usesMetadata())
3066 return nullptr;
3067
3068 gcp_map_type &GCMap = getGCMap(GCMetadataPrinters);
3069 gcp_map_type::iterator GCPI = GCMap.find(&S);
3070 if (GCPI != GCMap.end())
3071 return GCPI->second.get();
3072
3073 auto Name = S.getName();
3074
3075 for (GCMetadataPrinterRegistry::iterator
3076 I = GCMetadataPrinterRegistry::begin(),
3077 E = GCMetadataPrinterRegistry::end(); I != E; ++I)
3078 if (Name == I->getName()) {
3079 std::unique_ptr<GCMetadataPrinter> GMP = I->instantiate();
3080 GMP->S = &S;
3081 auto IterBool = GCMap.insert(std::make_pair(&S, std::move(GMP)));
3082 return IterBool.first->second.get();
3083 }
3084
3085 report_fatal_error("no GCMetadataPrinter registered for GC: " + Twine(Name));
3086}
3087
3088void AsmPrinter::emitStackMaps(StackMaps &SM) {
3089 GCModuleInfo *MI = getAnalysisIfAvailable<GCModuleInfo>();
3090 assert(MI && "AsmPrinter didn't require GCModuleInfo?")((MI && "AsmPrinter didn't require GCModuleInfo?") ? static_cast
<void> (0) : __assert_fail ("MI && \"AsmPrinter didn't require GCModuleInfo?\""
, "/build/llvm-toolchain-snapshot-9~svn362543/lib/CodeGen/AsmPrinter/AsmPrinter.cpp"
, 3090, __PRETTY_FUNCTION__))
;
3091 bool NeedsDefault = false;
3092 if (MI->begin() == MI->end())
3093 // No GC strategy, use the default format.
3094 NeedsDefault = true;
3095 else
3096 for (auto &I : *MI) {
3097 if (GCMetadataPrinter *MP = GetOrCreateGCPrinter(*I))
3098 if (MP->emitStackMaps(SM, *this))
3099 continue;
3100 // The strategy doesn't have printer or doesn't emit custom stack maps.
3101 // Use the default format.
3102 NeedsDefault = true;
3103 }
3104
3105 if (NeedsDefault)
3106 SM.serializeToStackMapSection();
3107}
3108
3109/// Pin vtable to this file.
3110AsmPrinterHandler::~AsmPrinterHandler() = default;
3111
3112void AsmPrinterHandler::markFunctionEnd() {}
3113
3114// In the binary's "xray_instr_map" section, an array of these function entries
3115// describes each instrumentation point. When XRay patches your code, the index
3116// into this table will be given to your handler as a patch point identifier.
3117void AsmPrinter::XRayFunctionEntry::emit(int Bytes, MCStreamer *Out,
3118 const MCSymbol *CurrentFnSym) const {
3119 Out->EmitSymbolValue(Sled, Bytes);
3120 Out->EmitSymbolValue(CurrentFnSym, Bytes);
3121 auto Kind8 = static_cast<uint8_t>(Kind);
3122 Out->EmitBinaryData(StringRef(reinterpret_cast<const char *>(&Kind8), 1));
3123 Out->EmitBinaryData(
3124 StringRef(reinterpret_cast<const char *>(&AlwaysInstrument), 1));
3125 Out->EmitBinaryData(StringRef(reinterpret_cast<const char *>(&Version), 1));
3126 auto Padding = (4 * Bytes) - ((2 * Bytes) + 3);
3127 assert(Padding >= 0 && "Instrumentation map entry > 4 * Word Size")((Padding >= 0 && "Instrumentation map entry > 4 * Word Size"
) ? static_cast<void> (0) : __assert_fail ("Padding >= 0 && \"Instrumentation map entry > 4 * Word Size\""
, "/build/llvm-toolchain-snapshot-9~svn362543/lib/CodeGen/AsmPrinter/AsmPrinter.cpp"
, 3127, __PRETTY_FUNCTION__))
;
3128 Out->EmitZeros(Padding);
3129}
3130
3131void AsmPrinter::emitXRayTable() {
3132 if (Sleds.empty())
3133 return;
3134
3135 auto PrevSection = OutStreamer->getCurrentSectionOnly();
3136 const Function &F = MF->getFunction();
3137 MCSection *InstMap = nullptr;
3138 MCSection *FnSledIndex = nullptr;
3139 if (MF->getSubtarget().getTargetTriple().isOSBinFormatELF()) {
3140 auto Associated = dyn_cast<MCSymbolELF>(CurrentFnSym);
3141 assert(Associated != nullptr)((Associated != nullptr) ? static_cast<void> (0) : __assert_fail
("Associated != nullptr", "/build/llvm-toolchain-snapshot-9~svn362543/lib/CodeGen/AsmPrinter/AsmPrinter.cpp"
, 3141, __PRETTY_FUNCTION__))
;
3142 auto Flags = ELF::SHF_WRITE | ELF::SHF_ALLOC | ELF::SHF_LINK_ORDER;
3143 std::string GroupName;
3144 if (F.hasComdat()) {
3145 Flags |= ELF::SHF_GROUP;
3146 GroupName = F.getComdat()->getName();
3147 }
3148
3149 auto UniqueID = ++XRayFnUniqueID;
3150 InstMap =
3151 OutContext.getELFSection("xray_instr_map", ELF::SHT_PROGBITS, Flags, 0,
3152 GroupName, UniqueID, Associated);
3153 FnSledIndex =
3154 OutContext.getELFSection("xray_fn_idx", ELF::SHT_PROGBITS, Flags, 0,
3155 GroupName, UniqueID, Associated);
3156 } else if (MF->getSubtarget().getTargetTriple().isOSBinFormatMachO()) {
3157 InstMap = OutContext.getMachOSection("__DATA", "xray_instr_map", 0,
3158 SectionKind::getReadOnlyWithRel());
3159 FnSledIndex = OutContext.getMachOSection("__DATA", "xray_fn_idx", 0,
3160 SectionKind::getReadOnlyWithRel());
3161 } else {
3162 llvm_unreachable("Unsupported target")::llvm::llvm_unreachable_internal("Unsupported target", "/build/llvm-toolchain-snapshot-9~svn362543/lib/CodeGen/AsmPrinter/AsmPrinter.cpp"
, 3162)
;
3163 }
3164
3165 auto WordSizeBytes = MAI->getCodePointerSize();
3166
3167 // Now we switch to the instrumentation map section. Because this is done
3168 // per-function, we are able to create an index entry that will represent the
3169 // range of sleds associated with a function.
3170 MCSymbol *SledsStart = OutContext.createTempSymbol("xray_sleds_start", true);
3171 OutStreamer->SwitchSection(InstMap);
3172 OutStreamer->EmitLabel(SledsStart);
3173 for (const auto &Sled : Sleds)
3174 Sled.emit(WordSizeBytes, OutStreamer.get(), CurrentFnSym);
3175 MCSymbol *SledsEnd = OutContext.createTempSymbol("xray_sleds_end", true);
3176 OutStreamer->EmitLabel(SledsEnd);
3177
3178 // We then emit a single entry in the index per function. We use the symbols
3179 // that bound the instrumentation map as the range for a specific function.
3180 // Each entry here will be 2 * word size aligned, as we're writing down two
3181 // pointers. This should work for both 32-bit and 64-bit platforms.
3182 OutStreamer->SwitchSection(FnSledIndex);
3183 OutStreamer->EmitCodeAlignment(2 * WordSizeBytes);
3184 OutStreamer->EmitSymbolValue(SledsStart, WordSizeBytes, false);
3185 OutStreamer->EmitSymbolValue(SledsEnd, WordSizeBytes, false);
3186 OutStreamer->SwitchSection(PrevSection);
3187 Sleds.clear();
3188}
3189
3190void AsmPrinter::recordSled(MCSymbol *Sled, const MachineInstr &MI,
3191 SledKind Kind, uint8_t Version) {
3192 const Function &F = MI.getMF()->getFunction();
3193 auto Attr = F.getFnAttribute("function-instrument");
3194 bool LogArgs = F.hasFnAttribute("xray-log-args");
3195 bool AlwaysInstrument =
3196 Attr.isStringAttribute() && Attr.getValueAsString() == "xray-always";
3197 if (Kind == SledKind::FUNCTION_ENTER && LogArgs)
3198 Kind = SledKind::LOG_ARGS_ENTER;
3199 Sleds.emplace_back(XRayFunctionEntry{Sled, CurrentFnSym, Kind,
3200 AlwaysInstrument, &F, Version});
3201}
3202
3203uint16_t AsmPrinter::getDwarfVersion() const {
3204 return OutStreamer->getContext().getDwarfVersion();
3205}
3206
3207void AsmPrinter::setDwarfVersion(uint16_t Version) {
3208 OutStreamer->getContext().setDwarfVersion(Version);
3209}

/build/llvm-toolchain-snapshot-9~svn362543/include/llvm/IR/Value.h

1//===- llvm/Value.h - Definition of the Value class -------------*- C++ -*-===//
2//
3// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
4// See https://llvm.org/LICENSE.txt for license information.
5// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
6//
7//===----------------------------------------------------------------------===//
8//
9// This file declares the Value class.
10//
11//===----------------------------------------------------------------------===//
12
13#ifndef LLVM_IR_VALUE_H
14#define LLVM_IR_VALUE_H
15
16#include "llvm-c/Types.h"
17#include "llvm/ADT/iterator_range.h"
18#include "llvm/IR/Use.h"
19#include "llvm/Support/CBindingWrapping.h"
20#include "llvm/Support/Casting.h"
21#include <cassert>
22#include <iterator>
23#include <memory>
24
25namespace llvm {
26
27class APInt;
28class Argument;
29class BasicBlock;
30class Constant;
31class ConstantData;
32class ConstantAggregate;
33class DataLayout;
34class Function;
35class GlobalAlias;
36class GlobalIFunc;
37class GlobalIndirectSymbol;
38class GlobalObject;
39class GlobalValue;
40class GlobalVariable;
41class InlineAsm;
42class Instruction;
43class LLVMContext;
44class Module;
45class ModuleSlotTracker;
46class raw_ostream;
47template<typename ValueTy> class StringMapEntry;
48class StringRef;
49class Twine;
50class Type;
51class User;
52
53using ValueName = StringMapEntry<Value *>;
54
55//===----------------------------------------------------------------------===//
56// Value Class
57//===----------------------------------------------------------------------===//
58
59/// LLVM Value Representation
60///
61/// This is a very important LLVM class. It is the base class of all values
62/// computed by a program that may be used as operands to other values. Value is
63/// the super class of other important classes such as Instruction and Function.
64/// All Values have a Type. Type is not a subclass of Value. Some values can
65/// have a name and they belong to some Module. Setting the name on the Value
66/// automatically updates the module's symbol table.
67///
68/// Every value has a "use list" that keeps track of which other Values are
69/// using this Value. A Value can also have an arbitrary number of ValueHandle
70/// objects that watch it and listen to RAUW and Destroy events. See
71/// llvm/IR/ValueHandle.h for details.
72class Value {
73 // The least-significant bit of the first word of Value *must* be zero:
74 // http://www.llvm.org/docs/ProgrammersManual.html#the-waymarking-algorithm
75 Type *VTy;
76 Use *UseList;
77
78 friend class ValueAsMetadata; // Allow access to IsUsedByMD.
79 friend class ValueHandleBase;
80
81 const unsigned char SubclassID; // Subclass identifier (for isa/dyn_cast)
82 unsigned char HasValueHandle : 1; // Has a ValueHandle pointing to this?
83
84protected:
85 /// Hold subclass data that can be dropped.
86 ///
87 /// This member is similar to SubclassData, however it is for holding
88 /// information which may be used to aid optimization, but which may be
89 /// cleared to zero without affecting conservative interpretation.
90 unsigned char SubclassOptionalData : 7;
91
92private:
93 /// Hold arbitrary subclass data.
94 ///
95 /// This member is defined by this class, but is not used for anything.
96 /// Subclasses can use it to hold whatever state they find useful. This
97 /// field is initialized to zero by the ctor.
98 unsigned short SubclassData;
99
100protected:
101 /// The number of operands in the subclass.
102 ///
103 /// This member is defined by this class, but not used for anything.
104 /// Subclasses can use it to store their number of operands, if they have
105 /// any.
106 ///
107 /// This is stored here to save space in User on 64-bit hosts. Since most
108 /// instances of Value have operands, 32-bit hosts aren't significantly
109 /// affected.
110 ///
111 /// Note, this should *NOT* be used directly by any class other than User.
112 /// User uses this value to find the Use list.
113 enum : unsigned { NumUserOperandsBits = 28 };
114 unsigned NumUserOperands : NumUserOperandsBits;
115
116 // Use the same type as the bitfield above so that MSVC will pack them.
117 unsigned IsUsedByMD : 1;
118 unsigned HasName : 1;
119 unsigned HasHungOffUses : 1;
120 unsigned HasDescriptor : 1;
121
122private:
123 template <typename UseT> // UseT == 'Use' or 'const Use'
124 class use_iterator_impl
125 : public std::iterator<std::forward_iterator_tag, UseT *> {
126 friend class Value;
127
128 UseT *U;
129
130 explicit use_iterator_impl(UseT *u) : U(u) {}
131
132 public:
133 use_iterator_impl() : U() {}
134
135 bool operator==(const use_iterator_impl &x) const { return U == x.U; }
136 bool operator!=(const use_iterator_impl &x) const { return !operator==(x); }
137
138 use_iterator_impl &operator++() { // Preincrement
139 assert(U && "Cannot increment end iterator!")((U && "Cannot increment end iterator!") ? static_cast
<void> (0) : __assert_fail ("U && \"Cannot increment end iterator!\""
, "/build/llvm-toolchain-snapshot-9~svn362543/include/llvm/IR/Value.h"
, 139, __PRETTY_FUNCTION__))
;
140 U = U->getNext();
141 return *this;
142 }
143
144 use_iterator_impl operator++(int) { // Postincrement
145 auto tmp = *this;
146 ++*this;
147 return tmp;
148 }
149
150 UseT &operator*() const {
151 assert(U && "Cannot dereference end iterator!")((U && "Cannot dereference end iterator!") ? static_cast
<void> (0) : __assert_fail ("U && \"Cannot dereference end iterator!\""
, "/build/llvm-toolchain-snapshot-9~svn362543/include/llvm/IR/Value.h"
, 151, __PRETTY_FUNCTION__))
;
152 return *U;
153 }
154
155 UseT *operator->() const { return &operator*(); }
156
157 operator use_iterator_impl<const UseT>() const {
158 return use_iterator_impl<const UseT>(U);
159 }
160 };
161
162 template <typename UserTy> // UserTy == 'User' or 'const User'
163 class user_iterator_impl
164 : public std::iterator<std::forward_iterator_tag, UserTy *> {
165 use_iterator_impl<Use> UI;
166 explicit user_iterator_impl(Use *U) : UI(U) {}
167 friend class Value;
168
169 public:
170 user_iterator_impl() = default;
171
172 bool operator==(const user_iterator_impl &x) const { return UI == x.UI; }
173 bool operator!=(const user_iterator_impl &x) const { return !operator==(x); }
174
175 /// Returns true if this iterator is equal to user_end() on the value.
176 bool atEnd() const { return *this == user_iterator_impl(); }
177
178 user_iterator_impl &operator++() { // Preincrement
179 ++UI;
180 return *this;
181 }
182
183 user_iterator_impl operator++(int) { // Postincrement
184 auto tmp = *this;
185 ++*this;
186 return tmp;
187 }
188
189 // Retrieve a pointer to the current User.
190 UserTy *operator*() const {
191 return UI->getUser();
192 }
193
194 UserTy *operator->() const { return operator*(); }
195
196 operator user_iterator_impl<const UserTy>() const {
197 return user_iterator_impl<const UserTy>(*UI);
198 }
199
200 Use &getUse() const { return *UI; }
201 };
202
203protected:
204 Value(Type *Ty, unsigned scid);
205
206 /// Value's destructor should be virtual by design, but that would require
207 /// that Value and all of its subclasses have a vtable that effectively
208 /// duplicates the information in the value ID. As a size optimization, the
209 /// destructor has been protected, and the caller should manually call
210 /// deleteValue.
211 ~Value(); // Use deleteValue() to delete a generic Value.
212
213public:
214 Value(const Value &) = delete;
215 Value &operator=(const Value &) = delete;
216
217 /// Delete a pointer to a generic Value.
218 void deleteValue();
219
220 /// Support for debugging, callable in GDB: V->dump()
221 void dump() const;
222
223 /// Implement operator<< on Value.
224 /// @{
225 void print(raw_ostream &O, bool IsForDebug = false) const;
226 void print(raw_ostream &O, ModuleSlotTracker &MST,
227 bool IsForDebug = false) const;
228 /// @}
229
230 /// Print the name of this Value out to the specified raw_ostream.
231 ///
232 /// This is useful when you just want to print 'int %reg126', not the
233 /// instruction that generated it. If you specify a Module for context, then
234 /// even constanst get pretty-printed; for example, the type of a null
235 /// pointer is printed symbolically.
236 /// @{
237 void printAsOperand(raw_ostream &O, bool PrintType = true,
238 const Module *M = nullptr) const;
239 void printAsOperand(raw_ostream &O, bool PrintType,
240 ModuleSlotTracker &MST) const;
241 /// @}
242
243 /// All values are typed, get the type of this value.
244 Type *getType() const { return VTy; }
24
Returning pointer
245
246 /// All values hold a context through their type.
247 LLVMContext &getContext() const;
248
249 // All values can potentially be named.
250 bool hasName() const { return HasName; }
251 ValueName *getValueName() const;
252 void setValueName(ValueName *VN);
253
254private:
255 void destroyValueName();
256 enum class ReplaceMetadataUses { No, Yes };
257 void doRAUW(Value *New, ReplaceMetadataUses);
258 void setNameImpl(const Twine &Name);
259
260public:
261 /// Return a constant reference to the value's name.
262 ///
263 /// This guaranteed to return the same reference as long as the value is not
264 /// modified. If the value has a name, this does a hashtable lookup, so it's
265 /// not free.
266 StringRef getName() const;
267
268 /// Change the name of the value.
269 ///
270 /// Choose a new unique name if the provided name is taken.
271 ///
272 /// \param Name The new name; or "" if the value's name should be removed.
273 void setName(const Twine &Name);
274
275 /// Transfer the name from V to this value.
276 ///
277 /// After taking V's name, sets V's name to empty.
278 ///
279 /// \note It is an error to call V->takeName(V).
280 void takeName(Value *V);
281
282 /// Change all uses of this to point to a new Value.
283 ///
284 /// Go through the uses list for this definition and make each use point to
285 /// "V" instead of "this". After this completes, 'this's use list is
286 /// guaranteed to be empty.
287 void replaceAllUsesWith(Value *V);
288
289 /// Change non-metadata uses of this to point to a new Value.
290 ///
291 /// Go through the uses list for this definition and make each use point to
292 /// "V" instead of "this". This function skips metadata entries in the list.
293 void replaceNonMetadataUsesWith(Value *V);
294
295 /// replaceUsesOutsideBlock - Go through the uses list for this definition and
296 /// make each use point to "V" instead of "this" when the use is outside the
297 /// block. 'This's use list is expected to have at least one element.
298 /// Unlike replaceAllUsesWith this function does not support basic block
299 /// values or constant users.
300 void replaceUsesOutsideBlock(Value *V, BasicBlock *BB);
301
302 //----------------------------------------------------------------------
303 // Methods for handling the chain of uses of this Value.
304 //
305 // Materializing a function can introduce new uses, so these methods come in
306 // two variants:
307 // The methods that start with materialized_ check the uses that are
308 // currently known given which functions are materialized. Be very careful
309 // when using them since you might not get all uses.
310 // The methods that don't start with materialized_ assert that modules is
311 // fully materialized.
312 void assertModuleIsMaterializedImpl() const;
313 // This indirection exists so we can keep assertModuleIsMaterializedImpl()
314 // around in release builds of Value.cpp to be linked with other code built
315 // in debug mode. But this avoids calling it in any of the release built code.
316 void assertModuleIsMaterialized() const {
317#ifndef NDEBUG
318 assertModuleIsMaterializedImpl();
319#endif
320 }
321
322 bool use_empty() const {
323 assertModuleIsMaterialized();
324 return UseList == nullptr;
325 }
326
327 bool materialized_use_empty() const {
328 return UseList == nullptr;
329 }
330
331 using use_iterator = use_iterator_impl<Use>;
332 using const_use_iterator = use_iterator_impl<const Use>;
333
334 use_iterator materialized_use_begin() { return use_iterator(UseList); }
335 const_use_iterator materialized_use_begin() const {
336 return const_use_iterator(UseList);
337 }
338 use_iterator use_begin() {
339 assertModuleIsMaterialized();
340 return materialized_use_begin();
341 }
342 const_use_iterator use_begin() const {
343 assertModuleIsMaterialized();
344 return materialized_use_begin();
345 }
346 use_iterator use_end() { return use_iterator(); }
347 const_use_iterator use_end() const { return const_use_iterator(); }
348 iterator_range<use_iterator> materialized_uses() {
349 return make_range(materialized_use_begin(), use_end());
350 }
351 iterator_range<const_use_iterator> materialized_uses() const {
352 return make_range(materialized_use_begin(), use_end());
353 }
354 iterator_range<use_iterator> uses() {
355 assertModuleIsMaterialized();
356 return materialized_uses();
357 }
358 iterator_range<const_use_iterator> uses() const {
359 assertModuleIsMaterialized();
360 return materialized_uses();
361 }
362
363 bool user_empty() const {
364 assertModuleIsMaterialized();
365 return UseList == nullptr;
366 }
367
368 using user_iterator = user_iterator_impl<User>;
369 using const_user_iterator = user_iterator_impl<const User>;
370
371 user_iterator materialized_user_begin() { return user_iterator(UseList); }
372 const_user_iterator materialized_user_begin() const {
373 return const_user_iterator(UseList);
374 }
375 user_iterator user_begin() {
376 assertModuleIsMaterialized();
377 return materialized_user_begin();
378 }
379 const_user_iterator user_begin() const {
380 assertModuleIsMaterialized();
381 return materialized_user_begin();
382 }
383 user_iterator user_end() { return user_iterator(); }
384 const_user_iterator user_end() const { return const_user_iterator(); }
385 User *user_back() {
386 assertModuleIsMaterialized();
387 return *materialized_user_begin();
388 }
389 const User *user_back() const {
390 assertModuleIsMaterialized();
391 return *materialized_user_begin();
392 }
393 iterator_range<user_iterator> materialized_users() {
394 return make_range(materialized_user_begin(), user_end());
395 }
396 iterator_range<const_user_iterator> materialized_users() const {
397 return make_range(materialized_user_begin(), user_end());
398 }
399 iterator_range<user_iterator> users() {
400 assertModuleIsMaterialized();
401 return materialized_users();
402 }
403 iterator_range<const_user_iterator> users() const {
404 assertModuleIsMaterialized();
405 return materialized_users();
406 }
407
408 /// Return true if there is exactly one user of this value.
409 ///
410 /// This is specialized because it is a common request and does not require
411 /// traversing the whole use list.
412 bool hasOneUse() const {
413 const_use_iterator I = use_begin(), E = use_end();
414 if (I == E) return false;
415 return ++I == E;
416 }
417
418 /// Return true if this Value has exactly N users.
419 bool hasNUses(unsigned N) const;
420
421 /// Return true if this value has N users or more.
422 ///
423 /// This is logically equivalent to getNumUses() >= N.
424 bool hasNUsesOrMore(unsigned N) const;
425
426 /// Check if this value is used in the specified basic block.
427 bool isUsedInBasicBlock(const BasicBlock *BB) const;
428
429 /// This method computes the number of uses of this Value.
430 ///
431 /// This is a linear time operation. Use hasOneUse, hasNUses, or
432 /// hasNUsesOrMore to check for specific values.
433 unsigned getNumUses() const;
434
435 /// This method should only be used by the Use class.
436 void addUse(Use &U) { U.addToList(&UseList); }
437
438 /// Concrete subclass of this.
439 ///
440 /// An enumeration for keeping track of the concrete subclass of Value that
441 /// is actually instantiated. Values of this enumeration are kept in the
442 /// Value classes SubclassID field. They are used for concrete type
443 /// identification.
444 enum ValueTy {
445#define HANDLE_VALUE(Name) Name##Val,
446#include "llvm/IR/Value.def"
447
448 // Markers:
449#define HANDLE_CONSTANT_MARKER(Marker, Constant) Marker = Constant##Val,
450#include "llvm/IR/Value.def"
451 };
452
453 /// Return an ID for the concrete type of this object.
454 ///
455 /// This is used to implement the classof checks. This should not be used
456 /// for any other purpose, as the values may change as LLVM evolves. Also,
457 /// note that for instructions, the Instruction's opcode is added to
458 /// InstructionVal. So this means three things:
459 /// # there is no value with code InstructionVal (no opcode==0).
460 /// # there are more possible values for the value type than in ValueTy enum.
461 /// # the InstructionVal enumerator must be the highest valued enumerator in
462 /// the ValueTy enum.
463 unsigned getValueID() const {
464 return SubclassID;
465 }
466
467 /// Return the raw optional flags value contained in this value.
468 ///
469 /// This should only be used when testing two Values for equivalence.
470 unsigned getRawSubclassOptionalData() const {
471 return SubclassOptionalData;
472 }
473
474 /// Clear the optional flags contained in this value.
475 void clearSubclassOptionalData() {
476 SubclassOptionalData = 0;
477 }
478
479 /// Check the optional flags for equality.
480 bool hasSameSubclassOptionalData(const Value *V) const {
481 return SubclassOptionalData == V->SubclassOptionalData;
482 }
483
484 /// Return true if there is a value handle associated with this value.
485 bool hasValueHandle() const { return HasValueHandle; }
486
487 /// Return true if there is metadata referencing this value.
488 bool isUsedByMetadata() const { return IsUsedByMD; }
489
490 /// Return true if this value is a swifterror value.
491 ///
492 /// swifterror values can be either a function argument or an alloca with a
493 /// swifterror attribute.
494 bool isSwiftError() const;
495
496 /// Strip off pointer casts, all-zero GEPs, and aliases.
497 ///
498 /// Returns the original uncasted value. If this is called on a non-pointer
499 /// value, it returns 'this'.
500 const Value *stripPointerCasts() const;
501 Value *stripPointerCasts() {
502 return const_cast<Value *>(
503 static_cast<const Value *>(this)->stripPointerCasts());
504 }
505
506 /// Strip off pointer casts, all-zero GEPs, aliases and invariant group
507 /// info.
508 ///
509 /// Returns the original uncasted value. If this is called on a non-pointer
510 /// value, it returns 'this'. This function should be used only in
511 /// Alias analysis.
512 const Value *stripPointerCastsAndInvariantGroups() const;
513 Value *stripPointerCastsAndInvariantGroups() {
514 return const_cast<Value *>(
515 static_cast<const Value *>(this)->stripPointerCastsAndInvariantGroups());
516 }
517
518 /// Strip off pointer casts and all-zero GEPs.
519 ///
520 /// Returns the original uncasted value. If this is called on a non-pointer
521 /// value, it returns 'this'.
522 const Value *stripPointerCastsNoFollowAliases() const;
523 Value *stripPointerCastsNoFollowAliases() {
524 return const_cast<Value *>(
525 static_cast<const Value *>(this)->stripPointerCastsNoFollowAliases());
526 }
527
528 /// Strip off pointer casts and all-constant inbounds GEPs.
529 ///
530 /// Returns the original pointer value. If this is called on a non-pointer
531 /// value, it returns 'this'.
532 const Value *stripInBoundsConstantOffsets() const;
533 Value *stripInBoundsConstantOffsets() {
534 return const_cast<Value *>(
535 static_cast<const Value *>(this)->stripInBoundsConstantOffsets());
536 }
537
538 /// Accumulate offsets from \a stripInBoundsConstantOffsets().
539 ///
540 /// Stores the resulting constant offset stripped into the APInt provided.
541 /// The provided APInt will be extended or truncated as needed to be the
542 /// correct bitwidth for an offset of this pointer type.
543 ///
544 /// If this is called on a non-pointer value, it returns 'this'.
545 const Value *stripAndAccumulateInBoundsConstantOffsets(const DataLayout &DL,
546 APInt &Offset) const;
547 Value *stripAndAccumulateInBoundsConstantOffsets(const DataLayout &DL,
548 APInt &Offset) {
549 return const_cast<Value *>(static_cast<const Value *>(this)
550 ->stripAndAccumulateInBoundsConstantOffsets(DL, Offset));
551 }
552
553 /// Strip off pointer casts and inbounds GEPs.
554 ///
555 /// Returns the original pointer value. If this is called on a non-pointer
556 /// value, it returns 'this'.
557 const Value *stripInBoundsOffsets() const;
558 Value *stripInBoundsOffsets() {
559 return const_cast<Value *>(
560 static_cast<const Value *>(this)->stripInBoundsOffsets());
561 }
562
563 /// Returns the number of bytes known to be dereferenceable for the
564 /// pointer value.
565 ///
566 /// If CanBeNull is set by this function the pointer can either be null or be
567 /// dereferenceable up to the returned number of bytes.
568 uint64_t getPointerDereferenceableBytes(const DataLayout &DL,
569 bool &CanBeNull) const;
570
571 /// Returns an alignment of the pointer value.
572 ///
573 /// Returns an alignment which is either specified explicitly, e.g. via
574 /// align attribute of a function argument, or guaranteed by DataLayout.
575 unsigned getPointerAlignment(const DataLayout &DL) const;
576
577 /// Translate PHI node to its predecessor from the given basic block.
578 ///
579 /// If this value is a PHI node with CurBB as its parent, return the value in
580 /// the PHI node corresponding to PredBB. If not, return ourself. This is
581 /// useful if you want to know the value something has in a predecessor
582 /// block.
583 const Value *DoPHITranslation(const BasicBlock *CurBB,
584 const BasicBlock *PredBB) const;
585 Value *DoPHITranslation(const BasicBlock *CurBB, const BasicBlock *PredBB) {
586 return const_cast<Value *>(
587 static_cast<const Value *>(this)->DoPHITranslation(CurBB, PredBB));
588 }
589
590 /// The maximum alignment for instructions.
591 ///
592 /// This is the greatest alignment value supported by load, store, and alloca
593 /// instructions, and global values.
594 static const unsigned MaxAlignmentExponent = 29;
595 static const unsigned MaximumAlignment = 1u << MaxAlignmentExponent;
596
597 /// Mutate the type of this Value to be of the specified type.
598 ///
599 /// Note that this is an extremely dangerous operation which can create
600 /// completely invalid IR very easily. It is strongly recommended that you
601 /// recreate IR objects with the right types instead of mutating them in
602 /// place.
603 void mutateType(Type *Ty) {
604 VTy = Ty;
605 }
606
607 /// Sort the use-list.
608 ///
609 /// Sorts the Value's use-list by Cmp using a stable mergesort. Cmp is
610 /// expected to compare two \a Use references.
611 template <class Compare> void sortUseList(Compare Cmp);
612
613 /// Reverse the use-list.
614 void reverseUseList();
615
616private:
617 /// Merge two lists together.
618 ///
619 /// Merges \c L and \c R using \c Cmp. To enable stable sorts, always pushes
620 /// "equal" items from L before items from R.
621 ///
622 /// \return the first element in the list.
623 ///
624 /// \note Completely ignores \a Use::Prev (doesn't read, doesn't update).
625 template <class Compare>
626 static Use *mergeUseLists(Use *L, Use *R, Compare Cmp) {
627 Use *Merged;
628 Use **Next = &Merged;
629
630 while (true) {
631 if (!L) {
632 *Next = R;
633 break;
634 }
635 if (!R) {
636 *Next = L;
637 break;
638 }
639 if (Cmp(*R, *L)) {
640 *Next = R;
641 Next = &R->Next;
642 R = R->Next;
643 } else {
644 *Next = L;
645 Next = &L->Next;
646 L = L->Next;
647 }
648 }
649
650 return Merged;
651 }
652
653protected:
654 unsigned short getSubclassDataFromValue() const { return SubclassData; }
655 void setValueSubclassData(unsigned short D) { SubclassData = D; }
656};
657
658struct ValueDeleter { void operator()(Value *V) { V->deleteValue(); } };
659
660/// Use this instead of std::unique_ptr<Value> or std::unique_ptr<Instruction>.
661/// Those don't work because Value and Instruction's destructors are protected,
662/// aren't virtual, and won't destroy the complete object.
663using unique_value = std::unique_ptr<Value, ValueDeleter>;
664
665inline raw_ostream &operator<<(raw_ostream &OS, const Value &V) {
666 V.print(OS);
667 return OS;
668}
669
670void Use::set(Value *V) {
671 if (Val) removeFromList();
672 Val = V;
673 if (V) V->addUse(*this);
674}
675
676Value *Use::operator=(Value *RHS) {
677 set(RHS);
678 return RHS;
679}
680
681const Use &Use::operator=(const Use &RHS) {
682 set(RHS.Val);
683 return *this;
684}
685
686template <class Compare> void Value::sortUseList(Compare Cmp) {
687 if (!UseList || !UseList->Next)
688 // No need to sort 0 or 1 uses.
689 return;
690
691 // Note: this function completely ignores Prev pointers until the end when
692 // they're fixed en masse.
693
694 // Create a binomial vector of sorted lists, visiting uses one at a time and
695 // merging lists as necessary.
696 const unsigned MaxSlots = 32;
697 Use *Slots[MaxSlots];
698
699 // Collect the first use, turning it into a single-item list.
700 Use *Next = UseList->Next;
701 UseList->Next = nullptr;
702 unsigned NumSlots = 1;
703 Slots[0] = UseList;
704
705 // Collect all but the last use.
706 while (Next->Next) {
707 Use *Current = Next;
708 Next = Current->Next;
709
710 // Turn Current into a single-item list.
711 Current->Next = nullptr;
712
713 // Save Current in the first available slot, merging on collisions.
714 unsigned I;
715 for (I = 0; I < NumSlots; ++I) {
716 if (!Slots[I])
717 break;
718
719 // Merge two lists, doubling the size of Current and emptying slot I.
720 //
721 // Since the uses in Slots[I] originally preceded those in Current, send
722 // Slots[I] in as the left parameter to maintain a stable sort.
723 Current = mergeUseLists(Slots[I], Current, Cmp);
724 Slots[I] = nullptr;
725 }
726 // Check if this is a new slot.
727 if (I == NumSlots) {
728 ++NumSlots;
729 assert(NumSlots <= MaxSlots && "Use list bigger than 2^32")((NumSlots <= MaxSlots && "Use list bigger than 2^32"
) ? static_cast<void> (0) : __assert_fail ("NumSlots <= MaxSlots && \"Use list bigger than 2^32\""
, "/build/llvm-toolchain-snapshot-9~svn362543/include/llvm/IR/Value.h"
, 729, __PRETTY_FUNCTION__))
;
730 }
731
732 // Found an open slot.
733 Slots[I] = Current;
734 }
735
736 // Merge all the lists together.
737 assert(Next && "Expected one more Use")((Next && "Expected one more Use") ? static_cast<void
> (0) : __assert_fail ("Next && \"Expected one more Use\""
, "/build/llvm-toolchain-snapshot-9~svn362543/include/llvm/IR/Value.h"
, 737, __PRETTY_FUNCTION__))
;
738 assert(!Next->Next && "Expected only one Use")((!Next->Next && "Expected only one Use") ? static_cast
<void> (0) : __assert_fail ("!Next->Next && \"Expected only one Use\""
, "/build/llvm-toolchain-snapshot-9~svn362543/include/llvm/IR/Value.h"
, 738, __PRETTY_FUNCTION__))
;
739 UseList = Next;
740 for (unsigned I = 0; I < NumSlots; ++I)
741 if (Slots[I])
742 // Since the uses in Slots[I] originally preceded those in UseList, send
743 // Slots[I] in as the left parameter to maintain a stable sort.
744 UseList = mergeUseLists(Slots[I], UseList, Cmp);
745
746 // Fix the Prev pointers.
747 for (Use *I = UseList, **Prev = &UseList; I; I = I->Next) {
748 I->setPrev(Prev);
749 Prev = &I->Next;
750 }
751}
752
753// isa - Provide some specializations of isa so that we don't have to include
754// the subtype header files to test to see if the value is a subclass...
755//
756template <> struct isa_impl<Constant, Value> {
757 static inline bool doit(const Value &Val) {
758 static_assert(Value::ConstantFirstVal == 0, "Val.getValueID() >= Value::ConstantFirstVal");
759 return Val.getValueID() <= Value::ConstantLastVal;
760 }
761};
762
763template <> struct isa_impl<ConstantData, Value> {
764 static inline bool doit(const Value &Val) {
765 return Val.getValueID() >= Value::ConstantDataFirstVal &&
766 Val.getValueID() <= Value::ConstantDataLastVal;
767 }
768};
769
770template <> struct isa_impl<ConstantAggregate, Value> {
771 static inline bool doit(const Value &Val) {
772 return Val.getValueID() >= Value::ConstantAggregateFirstVal &&
773 Val.getValueID() <= Value::ConstantAggregateLastVal;
774 }
775};
776
777template <> struct isa_impl<Argument, Value> {
778 static inline bool doit (const Value &Val) {
779 return Val.getValueID() == Value::ArgumentVal;
780 }
781};
782
783template <> struct isa_impl<InlineAsm, Value> {
784 static inline bool doit(const Value &Val) {
785 return Val.getValueID() == Value::InlineAsmVal;
786 }
787};
788
789template <> struct isa_impl<Instruction, Value> {
790 static inline bool doit(const Value &Val) {
791 return Val.getValueID() >= Value::InstructionVal;
792 }
793};
794
795template <> struct isa_impl<BasicBlock, Value> {
796 static inline bool doit(const Value &Val) {
797 return Val.getValueID() == Value::BasicBlockVal;
798 }
799};
800
801template <> struct isa_impl<Function, Value> {
802 static inline bool doit(const Value &Val) {
803 return Val.getValueID() == Value::FunctionVal;
804 }
805};
806
807template <> struct isa_impl<GlobalVariable, Value> {
808 static inline bool doit(const Value &Val) {
809 return Val.getValueID() == Value::GlobalVariableVal;
810 }
811};
812
813template <> struct isa_impl<GlobalAlias, Value> {
814 static inline bool doit(const Value &Val) {
815 return Val.getValueID() == Value::GlobalAliasVal;
816 }
817};
818
819template <> struct isa_impl<GlobalIFunc, Value> {
820 static inline bool doit(const Value &Val) {
821 return Val.getValueID() == Value::GlobalIFuncVal;
822 }
823};
824
825template <> struct isa_impl<GlobalIndirectSymbol, Value> {
826 static inline bool doit(const Value &Val) {
827 return isa<GlobalAlias>(Val) || isa<GlobalIFunc>(Val);
828 }
829};
830
831template <> struct isa_impl<GlobalValue, Value> {
832 static inline bool doit(const Value &Val) {
833 return isa<GlobalObject>(Val) || isa<GlobalIndirectSymbol>(Val);
834 }
835};
836
837template <> struct isa_impl<GlobalObject, Value> {
838 static inline bool doit(const Value &Val) {
839 return isa<GlobalVariable>(Val) || isa<Function>(Val);
840 }
841};
842
843// Create wrappers for C Binding types (see CBindingWrapping.h).
844DEFINE_ISA_CONVERSION_FUNCTIONS(Value, LLVMValueRef)inline Value *unwrap(LLVMValueRef P) { return reinterpret_cast
<Value*>(P); } inline LLVMValueRef wrap(const Value *P)
{ return reinterpret_cast<LLVMValueRef>(const_cast<
Value*>(P)); } template<typename T> inline T *unwrap
(LLVMValueRef P) { return cast<T>(unwrap(P)); }
845
846// Specialized opaque value conversions.
847inline Value **unwrap(LLVMValueRef *Vals) {
848 return reinterpret_cast<Value**>(Vals);
849}
850
851template<typename T>
852inline T **unwrap(LLVMValueRef *Vals, unsigned Length) {
853#ifndef NDEBUG
854 for (LLVMValueRef *I = Vals, *E = Vals + Length; I != E; ++I)
855 unwrap<T>(*I); // For side effect of calling assert on invalid usage.
856#endif
857 (void)Length;
858 return reinterpret_cast<T**>(Vals);
859}
860
861inline LLVMValueRef *wrap(const Value **Vals) {
862 return reinterpret_cast<LLVMValueRef*>(const_cast<Value**>(Vals));
863}
864
865} // end namespace llvm
866
867#endif // LLVM_IR_VALUE_H