Bug Summary

File:llvm/lib/CodeGen/AsmPrinter/AsmPrinter.cpp
Warning:line 310, column 25
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 -setup-static-analyzer -analyzer-config-compatibility-mode=true -mrelocation-model pic -pic-level 2 -mthread-model posix -mframe-pointer=none -fmath-errno -fno-rounding-math -masm-verbose -mconstructor-aliases -munwind-tables -fuse-init-array -target-cpu x86-64 -dwarf-column-info -debugger-tuning=gdb -ffunction-sections -fdata-sections -resource-dir /usr/lib/llvm-10/lib/clang/10.0.0 -D _DEBUG -D _GNU_SOURCE -D __STDC_CONSTANT_MACROS -D __STDC_FORMAT_MACROS -D __STDC_LIMIT_MACROS -I /build/llvm-toolchain-snapshot-10~+201911111502510600c19528f1809/build-llvm/lib/CodeGen/AsmPrinter -I /build/llvm-toolchain-snapshot-10~+201911111502510600c19528f1809/llvm/lib/CodeGen/AsmPrinter -I /build/llvm-toolchain-snapshot-10~+201911111502510600c19528f1809/build-llvm/include -I /build/llvm-toolchain-snapshot-10~+201911111502510600c19528f1809/llvm/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/local/include -internal-isystem /usr/lib/llvm-10/lib/clang/10.0.0/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++14 -fdeprecated-macro -fdebug-compilation-dir /build/llvm-toolchain-snapshot-10~+201911111502510600c19528f1809/build-llvm/lib/CodeGen/AsmPrinter -fdebug-prefix-map=/build/llvm-toolchain-snapshot-10~+201911111502510600c19528f1809=. -ferror-limit 19 -fmessage-length 0 -fvisibility-inlines-hidden -stack-protector 2 -fgnuc-version=4.2.1 -fobjc-runtime=gcc -fdiagnostics-show-option -vectorize-loops -vectorize-slp -analyzer-output=html -analyzer-config stable-report-filename=true -faddrsig -o /tmp/scan-build-2019-12-07-102640-14763-1 -x c++ /build/llvm-toolchain-snapshot-10~+201911111502510600c19528f1809/llvm/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/MCSectionXCOFF.h"
95#include "llvm/MC/MCStreamer.h"
96#include "llvm/MC/MCSubtargetInfo.h"
97#include "llvm/MC/MCSymbol.h"
98#include "llvm/MC/MCSymbolELF.h"
99#include "llvm/MC/MCSymbolXCOFF.h"
100#include "llvm/MC/MCTargetOptions.h"
101#include "llvm/MC/MCValue.h"
102#include "llvm/MC/SectionKind.h"
103#include "llvm/Pass.h"
104#include "llvm/Remarks/Remark.h"
105#include "llvm/Remarks/RemarkFormat.h"
106#include "llvm/Remarks/RemarkStringTable.h"
107#include "llvm/Support/Casting.h"
108#include "llvm/Support/CommandLine.h"
109#include "llvm/Support/Compiler.h"
110#include "llvm/Support/ErrorHandling.h"
111#include "llvm/Support/Format.h"
112#include "llvm/Support/MathExtras.h"
113#include "llvm/Support/Path.h"
114#include "llvm/Support/TargetRegistry.h"
115#include "llvm/Support/Timer.h"
116#include "llvm/Support/raw_ostream.h"
117#include "llvm/Target/TargetLoweringObjectFile.h"
118#include "llvm/Target/TargetMachine.h"
119#include "llvm/Target/TargetOptions.h"
120#include <algorithm>
121#include <cassert>
122#include <cinttypes>
123#include <cstdint>
124#include <iterator>
125#include <limits>
126#include <memory>
127#include <string>
128#include <utility>
129#include <vector>
130
131using namespace llvm;
132
133#define DEBUG_TYPE"asm-printer" "asm-printer"
134
135static const char *const DWARFGroupName = "dwarf";
136static const char *const DWARFGroupDescription = "DWARF Emission";
137static const char *const DbgTimerName = "emit";
138static const char *const DbgTimerDescription = "Debug Info Emission";
139static const char *const EHTimerName = "write_exception";
140static const char *const EHTimerDescription = "DWARF Exception Writer";
141static const char *const CFGuardName = "Control Flow Guard";
142static const char *const CFGuardDescription = "Control Flow Guard";
143static const char *const CodeViewLineTablesGroupName = "linetables";
144static const char *const CodeViewLineTablesGroupDescription =
145 "CodeView Line Tables";
146
147STATISTIC(EmittedInsts, "Number of machine instrs printed")static llvm::Statistic EmittedInsts = {"asm-printer", "EmittedInsts"
, "Number of machine instrs printed"}
;
148
149char AsmPrinter::ID = 0;
150
151using gcp_map_type = DenseMap<GCStrategy *, std::unique_ptr<GCMetadataPrinter>>;
152
153static gcp_map_type &getGCMap(void *&P) {
154 if (!P)
155 P = new gcp_map_type();
156 return *(gcp_map_type*)P;
157}
158
159/// getGVAlignment - Return the alignment to use for the specified global
160/// value. This rounds up to the preferred alignment if possible and legal.
161Align AsmPrinter::getGVAlignment(const GlobalValue *GV, const DataLayout &DL,
162 Align InAlign) {
163 Align Alignment;
164 if (const GlobalVariable *GVar = dyn_cast<GlobalVariable>(GV))
165 Alignment = Align(DL.getPreferredAlignment(GVar));
166
167 // If InAlign is specified, round it to it.
168 if (InAlign > Alignment)
169 Alignment = InAlign;
170
171 // If the GV has a specified alignment, take it into account.
172 const MaybeAlign GVAlign(GV->getAlignment());
173 if (!GVAlign)
174 return Alignment;
175
176 assert(GVAlign && "GVAlign must be set")((GVAlign && "GVAlign must be set") ? static_cast<
void> (0) : __assert_fail ("GVAlign && \"GVAlign must be set\""
, "/build/llvm-toolchain-snapshot-10~+201911111502510600c19528f1809/llvm/lib/CodeGen/AsmPrinter/AsmPrinter.cpp"
, 176, __PRETTY_FUNCTION__))
;
177
178 // If the GVAlign is larger than NumBits, or if we are required to obey
179 // NumBits because the GV has an assigned section, obey it.
180 if (*GVAlign > Alignment || GV->hasSection())
181 Alignment = *GVAlign;
182 return Alignment;
183}
184
185AsmPrinter::AsmPrinter(TargetMachine &tm, std::unique_ptr<MCStreamer> Streamer)
186 : MachineFunctionPass(ID), TM(tm), MAI(tm.getMCAsmInfo()),
187 OutContext(Streamer->getContext()), OutStreamer(std::move(Streamer)) {
188 VerboseAsm = OutStreamer->isVerboseAsm();
189}
190
191AsmPrinter::~AsmPrinter() {
192 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-10~+201911111502510600c19528f1809/llvm/lib/CodeGen/AsmPrinter/AsmPrinter.cpp"
, 192, __PRETTY_FUNCTION__))
;
193
194 if (GCMetadataPrinters) {
195 gcp_map_type &GCMap = getGCMap(GCMetadataPrinters);
196
197 delete &GCMap;
198 GCMetadataPrinters = nullptr;
199 }
200}
201
202bool AsmPrinter::isPositionIndependent() const {
203 return TM.isPositionIndependent();
204}
205
206/// getFunctionNumber - Return a unique ID for the current function.
207unsigned AsmPrinter::getFunctionNumber() const {
208 return MF->getFunctionNumber();
209}
210
211const TargetLoweringObjectFile &AsmPrinter::getObjFileLowering() const {
212 return *TM.getObjFileLowering();
213}
214
215const DataLayout &AsmPrinter::getDataLayout() const {
216 return MMI->getModule()->getDataLayout();
217}
218
219// Do not use the cached DataLayout because some client use it without a Module
220// (dsymutil, llvm-dwarfdump).
221unsigned AsmPrinter::getPointerSize() const {
222 return TM.getPointerSize(0); // FIXME: Default address space
223}
224
225const MCSubtargetInfo &AsmPrinter::getSubtargetInfo() const {
226 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-10~+201911111502510600c19528f1809/llvm/lib/CodeGen/AsmPrinter/AsmPrinter.cpp"
, 226, __PRETTY_FUNCTION__))
;
227 return MF->getSubtarget<MCSubtargetInfo>();
228}
229
230void AsmPrinter::EmitToStreamer(MCStreamer &S, const MCInst &Inst) {
231 S.EmitInstruction(Inst, getSubtargetInfo());
232}
233
234void AsmPrinter::emitInitialRawDwarfLocDirective(const MachineFunction &MF) {
235 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-10~+201911111502510600c19528f1809/llvm/lib/CodeGen/AsmPrinter/AsmPrinter.cpp"
, 235, __PRETTY_FUNCTION__))
;
236 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-10~+201911111502510600c19528f1809/llvm/lib/CodeGen/AsmPrinter/AsmPrinter.cpp"
, 236, __PRETTY_FUNCTION__))
;
237 (void)DD->emitInitialLocDirective(MF, /*CUID=*/0);
238}
239
240/// getCurrentSection() - Return the current section we are emitting to.
241const MCSection *AsmPrinter::getCurrentSection() const {
242 return OutStreamer->getCurrentSectionOnly();
243}
244
245void AsmPrinter::getAnalysisUsage(AnalysisUsage &AU) const {
246 AU.setPreservesAll();
247 MachineFunctionPass::getAnalysisUsage(AU);
248 AU.addRequired<MachineModuleInfoWrapperPass>();
249 AU.addRequired<MachineOptimizationRemarkEmitterPass>();
250 AU.addRequired<GCModuleInfo>();
251}
252
253bool AsmPrinter::doInitialization(Module &M) {
254 auto *MMIWP = getAnalysisIfAvailable<MachineModuleInfoWrapperPass>();
255 MMI = MMIWP
0.1
'MMIWP' is null
? &MMIWP->getMMI() : nullptr
;
1
'?' condition is false
2
Null pointer value stored to field 'MMI'
256
257 // Initialize TargetLoweringObjectFile.
258 const_cast<TargetLoweringObjectFile&>(getObjFileLowering())
259 .Initialize(OutContext, TM);
260
261 const_cast<TargetLoweringObjectFile &>(getObjFileLowering())
262 .getModuleMetadata(M);
263
264 OutStreamer->InitSections(false);
265
266 // Emit the version-min deployment target directive if needed.
267 //
268 // FIXME: If we end up with a collection of these sorts of Darwin-specific
269 // or ELF-specific things, it may make sense to have a platform helper class
270 // that will work with the target helper class. For now keep it here, as the
271 // alternative is duplicated code in each of the target asm printers that
272 // use the directive, where it would need the same conditionalization
273 // anyway.
274 const Triple &Target = TM.getTargetTriple();
275 OutStreamer->EmitVersionForTarget(Target, M.getSDKVersion());
276
277 // Allow the target to emit any magic that it wants at the start of the file.
278 EmitStartOfAsmFile(M);
279
280 // Very minimal debug info. It is ignored if we emit actual debug info. If we
281 // don't, this at least helps the user find where a global came from.
282 if (MAI->hasSingleParameterDotFile()) {
3
Assuming the condition is false
4
Taking false branch
283 // .file "foo.c"
284 OutStreamer->EmitFileDirective(
285 llvm::sys::path::filename(M.getSourceFileName()));
286 }
287
288 GCModuleInfo *MI = getAnalysisIfAvailable<GCModuleInfo>();
289 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-10~+201911111502510600c19528f1809/llvm/lib/CodeGen/AsmPrinter/AsmPrinter.cpp"
, 289, __PRETTY_FUNCTION__))
;
5
Assuming 'MI' is non-null
6
'?' condition is true
290 for (auto &I : *MI)
7
Assuming '__begin1' is equal to '__end1'
291 if (GCMetadataPrinter *MP = GetOrCreateGCPrinter(*I))
292 MP->beginAssembly(M, *MI, *this);
293
294 // Emit module-level inline asm if it exists.
295 if (!M.getModuleInlineAsm().empty()) {
8
Assuming the condition is false
9
Taking false branch
296 // We're at the module level. Construct MCSubtarget from the default CPU
297 // and target triple.
298 std::unique_ptr<MCSubtargetInfo> STI(TM.getTarget().createMCSubtargetInfo(
299 TM.getTargetTriple().str(), TM.getTargetCPU(),
300 TM.getTargetFeatureString()));
301 OutStreamer->AddComment("Start of file scope inline assembly");
302 OutStreamer->AddBlankLine();
303 EmitInlineAsm(M.getModuleInlineAsm()+"\n",
304 OutContext.getSubtargetCopy(*STI), TM.Options.MCOptions);
305 OutStreamer->AddComment("End of file scope inline assembly");
306 OutStreamer->AddBlankLine();
307 }
308
309 if (MAI->doesSupportDebugInformation()) {
10
Assuming the condition is true
11
Taking true branch
310 bool EmitCodeView = MMI->getModule()->getCodeViewFlag();
12
Called C++ object pointer is null
311 if (EmitCodeView && TM.getTargetTriple().isOSWindows()) {
312 Handlers.emplace_back(std::make_unique<CodeViewDebug>(this),
313 DbgTimerName, DbgTimerDescription,
314 CodeViewLineTablesGroupName,
315 CodeViewLineTablesGroupDescription);
316 }
317 if (!EmitCodeView || MMI->getModule()->getDwarfVersion()) {
318 DD = new DwarfDebug(this, &M);
319 DD->beginModule();
320 Handlers.emplace_back(std::unique_ptr<DwarfDebug>(DD), DbgTimerName,
321 DbgTimerDescription, DWARFGroupName,
322 DWARFGroupDescription);
323 }
324 }
325
326 switch (MAI->getExceptionHandlingType()) {
327 case ExceptionHandling::SjLj:
328 case ExceptionHandling::DwarfCFI:
329 case ExceptionHandling::ARM:
330 isCFIMoveForDebugging = true;
331 if (MAI->getExceptionHandlingType() != ExceptionHandling::DwarfCFI)
332 break;
333 for (auto &F: M.getFunctionList()) {
334 // If the module contains any function with unwind data,
335 // .eh_frame has to be emitted.
336 // Ignore functions that won't get emitted.
337 if (!F.isDeclarationForLinker() && F.needsUnwindTableEntry()) {
338 isCFIMoveForDebugging = false;
339 break;
340 }
341 }
342 break;
343 default:
344 isCFIMoveForDebugging = false;
345 break;
346 }
347
348 EHStreamer *ES = nullptr;
349 switch (MAI->getExceptionHandlingType()) {
350 case ExceptionHandling::None:
351 break;
352 case ExceptionHandling::SjLj:
353 case ExceptionHandling::DwarfCFI:
354 ES = new DwarfCFIException(this);
355 break;
356 case ExceptionHandling::ARM:
357 ES = new ARMException(this);
358 break;
359 case ExceptionHandling::WinEH:
360 switch (MAI->getWinEHEncodingType()) {
361 default: llvm_unreachable("unsupported unwinding information encoding")::llvm::llvm_unreachable_internal("unsupported unwinding information encoding"
, "/build/llvm-toolchain-snapshot-10~+201911111502510600c19528f1809/llvm/lib/CodeGen/AsmPrinter/AsmPrinter.cpp"
, 361)
;
362 case WinEH::EncodingType::Invalid:
363 break;
364 case WinEH::EncodingType::X86:
365 case WinEH::EncodingType::Itanium:
366 ES = new WinException(this);
367 break;
368 }
369 break;
370 case ExceptionHandling::Wasm:
371 ES = new WasmException(this);
372 break;
373 }
374 if (ES)
375 Handlers.emplace_back(std::unique_ptr<EHStreamer>(ES), EHTimerName,
376 EHTimerDescription, DWARFGroupName,
377 DWARFGroupDescription);
378
379 // Emit tables for any value of cfguard flag (i.e. cfguard=1 or cfguard=2).
380 if (mdconst::extract_or_null<ConstantInt>(
381 MMI->getModule()->getModuleFlag("cfguard")))
382 Handlers.emplace_back(std::make_unique<WinCFGuard>(this), CFGuardName,
383 CFGuardDescription, DWARFGroupName,
384 DWARFGroupDescription);
385 return false;
386}
387
388static bool canBeHidden(const GlobalValue *GV, const MCAsmInfo &MAI) {
389 if (!MAI.hasWeakDefCanBeHiddenDirective())
390 return false;
391
392 return GV->canBeOmittedFromSymbolTable();
393}
394
395void AsmPrinter::EmitLinkage(const GlobalValue *GV, MCSymbol *GVSym) const {
396 GlobalValue::LinkageTypes Linkage = GV->getLinkage();
397 switch (Linkage) {
398 case GlobalValue::CommonLinkage:
399 case GlobalValue::LinkOnceAnyLinkage:
400 case GlobalValue::LinkOnceODRLinkage:
401 case GlobalValue::WeakAnyLinkage:
402 case GlobalValue::WeakODRLinkage:
403 if (MAI->hasWeakDefDirective()) {
404 // .globl _foo
405 OutStreamer->EmitSymbolAttribute(GVSym, MCSA_Global);
406
407 if (!canBeHidden(GV, *MAI))
408 // .weak_definition _foo
409 OutStreamer->EmitSymbolAttribute(GVSym, MCSA_WeakDefinition);
410 else
411 OutStreamer->EmitSymbolAttribute(GVSym, MCSA_WeakDefAutoPrivate);
412 } else if (MAI->hasLinkOnceDirective()) {
413 // .globl _foo
414 OutStreamer->EmitSymbolAttribute(GVSym, MCSA_Global);
415 //NOTE: linkonce is handled by the section the symbol was assigned to.
416 } else {
417 // .weak _foo
418 OutStreamer->EmitSymbolAttribute(GVSym, MCSA_Weak);
419 }
420 return;
421 case GlobalValue::ExternalLinkage:
422 // If external, declare as a global symbol: .globl _foo
423 OutStreamer->EmitSymbolAttribute(GVSym, MCSA_Global);
424 return;
425 case GlobalValue::PrivateLinkage:
426 return;
427 case GlobalValue::InternalLinkage:
428 if (MAI->hasDotLGloblDirective())
429 OutStreamer->EmitSymbolAttribute(GVSym, MCSA_LGlobal);
430 return;
431 case GlobalValue::AppendingLinkage:
432 case GlobalValue::AvailableExternallyLinkage:
433 case GlobalValue::ExternalWeakLinkage:
434 llvm_unreachable("Should never emit this")::llvm::llvm_unreachable_internal("Should never emit this", "/build/llvm-toolchain-snapshot-10~+201911111502510600c19528f1809/llvm/lib/CodeGen/AsmPrinter/AsmPrinter.cpp"
, 434)
;
435 }
436 llvm_unreachable("Unknown linkage type!")::llvm::llvm_unreachable_internal("Unknown linkage type!", "/build/llvm-toolchain-snapshot-10~+201911111502510600c19528f1809/llvm/lib/CodeGen/AsmPrinter/AsmPrinter.cpp"
, 436)
;
437}
438
439void AsmPrinter::getNameWithPrefix(SmallVectorImpl<char> &Name,
440 const GlobalValue *GV) const {
441 TM.getNameWithPrefix(Name, GV, getObjFileLowering().getMangler());
442}
443
444MCSymbol *AsmPrinter::getSymbol(const GlobalValue *GV) const {
445 return TM.getSymbol(GV);
446}
447
448/// EmitGlobalVariable - Emit the specified global variable to the .s file.
449void AsmPrinter::EmitGlobalVariable(const GlobalVariable *GV) {
450 bool IsEmuTLSVar = TM.useEmulatedTLS() && GV->isThreadLocal();
451 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-10~+201911111502510600c19528f1809/llvm/lib/CodeGen/AsmPrinter/AsmPrinter.cpp"
, 452, __PRETTY_FUNCTION__))
452 "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-10~+201911111502510600c19528f1809/llvm/lib/CodeGen/AsmPrinter/AsmPrinter.cpp"
, 452, __PRETTY_FUNCTION__))
;
453
454 // Never emit TLS variable xyz in emulated TLS model.
455 // The initialization value is in __emutls_t.xyz instead of xyz.
456 if (IsEmuTLSVar)
457 return;
458
459 if (GV->hasInitializer()) {
460 // Check to see if this is a special global used by LLVM, if so, emit it.
461 if (EmitSpecialLLVMGlobal(GV))
462 return;
463
464 // Skip the emission of global equivalents. The symbol can be emitted later
465 // on by emitGlobalGOTEquivs in case it turns out to be needed.
466 if (GlobalGOTEquivs.count(getSymbol(GV)))
467 return;
468
469 if (isVerbose()) {
470 // When printing the control variable __emutls_v.*,
471 // we don't need to print the original TLS variable name.
472 GV->printAsOperand(OutStreamer->GetCommentOS(),
473 /*PrintType=*/false, GV->getParent());
474 OutStreamer->GetCommentOS() << '\n';
475 }
476 }
477
478 MCSymbol *GVSym = getSymbol(GV);
479 MCSymbol *EmittedSym = GVSym;
480
481 // getOrCreateEmuTLSControlSym only creates the symbol with name and default
482 // attributes.
483 // GV's or GVSym's attributes will be used for the EmittedSym.
484 EmitVisibility(EmittedSym, GV->getVisibility(), !GV->isDeclaration());
485
486 if (!GV->hasInitializer()) // External globals require no extra code.
487 return;
488
489 GVSym->redefineIfPossible();
490 if (GVSym->isDefined() || GVSym->isVariable())
491 report_fatal_error("symbol '" + Twine(GVSym->getName()) +
492 "' is already defined");
493
494 if (MAI->hasDotTypeDotSizeDirective())
495 OutStreamer->EmitSymbolAttribute(EmittedSym, MCSA_ELF_TypeObject);
496
497 SectionKind GVKind = TargetLoweringObjectFile::getKindForGlobal(GV, TM);
498
499 const DataLayout &DL = GV->getParent()->getDataLayout();
500 uint64_t Size = DL.getTypeAllocSize(GV->getValueType());
501
502 // If the alignment is specified, we *must* obey it. Overaligning a global
503 // with a specified alignment is a prompt way to break globals emitted to
504 // sections and expected to be contiguous (e.g. ObjC metadata).
505 const Align Alignment = getGVAlignment(GV, DL);
506
507 for (const HandlerInfo &HI : Handlers) {
508 NamedRegionTimer T(HI.TimerName, HI.TimerDescription,
509 HI.TimerGroupName, HI.TimerGroupDescription,
510 TimePassesIsEnabled);
511 HI.Handler->setSymbolSize(GVSym, Size);
512 }
513
514 // Handle common symbols
515 if (GVKind.isCommon()) {
516 if (Size == 0) Size = 1; // .comm Foo, 0 is undefined, avoid it.
517 // .comm _foo, 42, 4
518 const bool SupportsAlignment =
519 getObjFileLowering().getCommDirectiveSupportsAlignment();
520 OutStreamer->EmitCommonSymbol(GVSym, Size,
521 SupportsAlignment ? Alignment.value() : 0);
522 return;
523 }
524
525 // Determine to which section this global should be emitted.
526 MCSection *TheSection = getObjFileLowering().SectionForGlobal(GV, GVKind, TM);
527
528 // If we have a bss global going to a section that supports the
529 // zerofill directive, do so here.
530 if (GVKind.isBSS() && MAI->hasMachoZeroFillDirective() &&
531 TheSection->isVirtualSection()) {
532 if (Size == 0)
533 Size = 1; // zerofill of 0 bytes is undefined.
534 EmitLinkage(GV, GVSym);
535 // .zerofill __DATA, __bss, _foo, 400, 5
536 OutStreamer->EmitZerofill(TheSection, GVSym, Size, Alignment.value());
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
547 // Use .lcomm only if it supports user-specified alignment.
548 // Otherwise, while it would still be correct to use .lcomm in some
549 // cases (e.g. when Align == 1), the external assembler might enfore
550 // some -unknown- default alignment behavior, which could cause
551 // spurious differences between external and integrated assembler.
552 // Prefer to simply fall back to .local / .comm in this case.
553 if (MAI->getLCOMMDirectiveAlignmentType() != LCOMM::NoAlignment) {
554 // .lcomm _foo, 42
555 OutStreamer->EmitLocalCommonSymbol(GVSym, Size, Alignment.value());
556 return;
557 }
558
559 // .local _foo
560 OutStreamer->EmitSymbolAttribute(GVSym, MCSA_Local);
561 // .comm _foo, 42, 4
562 const bool SupportsAlignment =
563 getObjFileLowering().getCommDirectiveSupportsAlignment();
564 OutStreamer->EmitCommonSymbol(GVSym, Size,
565 SupportsAlignment ? Alignment.value() : 0);
566 return;
567 }
568
569 // Handle thread local data for mach-o which requires us to output an
570 // additional structure of data and mangle the original symbol so that we
571 // can reference it later.
572 //
573 // TODO: This should become an "emit thread local global" method on TLOF.
574 // All of this macho specific stuff should be sunk down into TLOFMachO and
575 // stuff like "TLSExtraDataSection" should no longer be part of the parent
576 // TLOF class. This will also make it more obvious that stuff like
577 // MCStreamer::EmitTBSSSymbol is macho specific and only called from macho
578 // specific code.
579 if (GVKind.isThreadLocal() && MAI->hasMachoTBSSDirective()) {
580 // Emit the .tbss symbol
581 MCSymbol *MangSym =
582 OutContext.getOrCreateSymbol(GVSym->getName() + Twine("$tlv$init"));
583
584 if (GVKind.isThreadBSS()) {
585 TheSection = getObjFileLowering().getTLSBSSSection();
586 OutStreamer->EmitTBSSSymbol(TheSection, MangSym, Size, Alignment.value());
587 } else if (GVKind.isThreadData()) {
588 OutStreamer->SwitchSection(TheSection);
589
590 EmitAlignment(Alignment, GV);
591 OutStreamer->EmitLabel(MangSym);
592
593 EmitGlobalConstant(GV->getParent()->getDataLayout(),
594 GV->getInitializer());
595 }
596
597 OutStreamer->AddBlankLine();
598
599 // Emit the variable struct for the runtime.
600 MCSection *TLVSect = getObjFileLowering().getTLSExtraDataSection();
601
602 OutStreamer->SwitchSection(TLVSect);
603 // Emit the linkage here.
604 EmitLinkage(GV, GVSym);
605 OutStreamer->EmitLabel(GVSym);
606
607 // Three pointers in size:
608 // - __tlv_bootstrap - used to make sure support exists
609 // - spare pointer, used when mapped by the runtime
610 // - pointer to mangled symbol above with initializer
611 unsigned PtrSize = DL.getPointerTypeSize(GV->getType());
612 OutStreamer->EmitSymbolValue(GetExternalSymbolSymbol("_tlv_bootstrap"),
613 PtrSize);
614 OutStreamer->EmitIntValue(0, PtrSize);
615 OutStreamer->EmitSymbolValue(MangSym, PtrSize);
616
617 OutStreamer->AddBlankLine();
618 return;
619 }
620
621 MCSymbol *EmittedInitSym = GVSym;
622
623 OutStreamer->SwitchSection(TheSection);
624
625 EmitLinkage(GV, EmittedInitSym);
626 EmitAlignment(Alignment, GV);
627
628 OutStreamer->EmitLabel(EmittedInitSym);
629
630 EmitGlobalConstant(GV->getParent()->getDataLayout(), GV->getInitializer());
631
632 if (MAI->hasDotTypeDotSizeDirective())
633 // .size foo, 42
634 OutStreamer->emitELFSize(EmittedInitSym,
635 MCConstantExpr::create(Size, OutContext));
636
637 OutStreamer->AddBlankLine();
638}
639
640/// Emit the directive and value for debug thread local expression
641///
642/// \p Value - The value to emit.
643/// \p Size - The size of the integer (in bytes) to emit.
644void AsmPrinter::EmitDebugValue(const MCExpr *Value, unsigned Size) const {
645 OutStreamer->EmitValue(Value, Size);
646}
647
648/// EmitFunctionHeader - This method emits the header for the current
649/// function.
650void AsmPrinter::EmitFunctionHeader() {
651 const Function &F = MF->getFunction();
652
653 if (isVerbose())
654 OutStreamer->GetCommentOS()
655 << "-- Begin function "
656 << GlobalValue::dropLLVMManglingEscape(F.getName()) << '\n';
657
658 // Print out constants referenced by the function
659 EmitConstantPool();
660
661 // Print the 'header' of function.
662 OutStreamer->SwitchSection(getObjFileLowering().SectionForGlobal(&F, TM));
663 EmitVisibility(CurrentFnSym, F.getVisibility());
664
665 if (MAI->needsFunctionDescriptors() &&
666 F.getLinkage() != GlobalValue::InternalLinkage)
667 EmitLinkage(&F, CurrentFnDescSym);
668
669 EmitLinkage(&F, CurrentFnSym);
670 if (MAI->hasFunctionAlignment())
671 EmitAlignment(MF->getAlignment(), &F);
672
673 if (MAI->hasDotTypeDotSizeDirective())
674 OutStreamer->EmitSymbolAttribute(CurrentFnSym, MCSA_ELF_TypeFunction);
675
676 if (F.hasFnAttribute(Attribute::Cold))
677 OutStreamer->EmitSymbolAttribute(CurrentFnSym, MCSA_Cold);
678
679 if (isVerbose()) {
680 F.printAsOperand(OutStreamer->GetCommentOS(),
681 /*PrintType=*/false, F.getParent());
682 OutStreamer->GetCommentOS() << '\n';
683 }
684
685 // Emit the prefix data.
686 if (F.hasPrefixData()) {
687 if (MAI->hasSubsectionsViaSymbols()) {
688 // Preserving prefix data on platforms which use subsections-via-symbols
689 // is a bit tricky. Here we introduce a symbol for the prefix data
690 // and use the .alt_entry attribute to mark the function's real entry point
691 // as an alternative entry point to the prefix-data symbol.
692 MCSymbol *PrefixSym = OutContext.createLinkerPrivateTempSymbol();
693 OutStreamer->EmitLabel(PrefixSym);
694
695 EmitGlobalConstant(F.getParent()->getDataLayout(), F.getPrefixData());
696
697 // Emit an .alt_entry directive for the actual function symbol.
698 OutStreamer->EmitSymbolAttribute(CurrentFnSym, MCSA_AltEntry);
699 } else {
700 EmitGlobalConstant(F.getParent()->getDataLayout(), F.getPrefixData());
701 }
702 }
703
704 // Emit the function descriptor. This is a virtual function to allow targets
705 // to emit their specific function descriptor.
706 if (MAI->needsFunctionDescriptors())
707 EmitFunctionDescriptor();
708
709 // Emit the CurrentFnSym. This is a virtual function to allow targets to do
710 // their wild and crazy things as required.
711 EmitFunctionEntryLabel();
712
713 // If the function had address-taken blocks that got deleted, then we have
714 // references to the dangling symbols. Emit them at the start of the function
715 // so that we don't get references to undefined symbols.
716 std::vector<MCSymbol*> DeadBlockSyms;
717 MMI->takeDeletedSymbolsForFunction(&F, DeadBlockSyms);
718 for (unsigned i = 0, e = DeadBlockSyms.size(); i != e; ++i) {
719 OutStreamer->AddComment("Address taken block that was later removed");
720 OutStreamer->EmitLabel(DeadBlockSyms[i]);
721 }
722
723 if (CurrentFnBegin) {
724 if (MAI->useAssignmentForEHBegin()) {
725 MCSymbol *CurPos = OutContext.createTempSymbol();
726 OutStreamer->EmitLabel(CurPos);
727 OutStreamer->EmitAssignment(CurrentFnBegin,
728 MCSymbolRefExpr::create(CurPos, OutContext));
729 } else {
730 OutStreamer->EmitLabel(CurrentFnBegin);
731 }
732 }
733
734 // Emit pre-function debug and/or EH information.
735 for (const HandlerInfo &HI : Handlers) {
736 NamedRegionTimer T(HI.TimerName, HI.TimerDescription, HI.TimerGroupName,
737 HI.TimerGroupDescription, TimePassesIsEnabled);
738 HI.Handler->beginFunction(MF);
739 }
740
741 // Emit the prologue data.
742 if (F.hasPrologueData())
743 EmitGlobalConstant(F.getParent()->getDataLayout(), F.getPrologueData());
744}
745
746/// EmitFunctionEntryLabel - Emit the label that is the entrypoint for the
747/// function. This can be overridden by targets as required to do custom stuff.
748void AsmPrinter::EmitFunctionEntryLabel() {
749 CurrentFnSym->redefineIfPossible();
750
751 // The function label could have already been emitted if two symbols end up
752 // conflicting due to asm renaming. Detect this and emit an error.
753 if (CurrentFnSym->isVariable())
754 report_fatal_error("'" + Twine(CurrentFnSym->getName()) +
755 "' is a protected alias");
756 if (CurrentFnSym->isDefined())
757 report_fatal_error("'" + Twine(CurrentFnSym->getName()) +
758 "' label emitted multiple times to assembly file");
759
760 return OutStreamer->EmitLabel(CurrentFnSym);
761}
762
763/// emitComments - Pretty-print comments for instructions.
764static void emitComments(const MachineInstr &MI, raw_ostream &CommentOS) {
765 const MachineFunction *MF = MI.getMF();
766 const TargetInstrInfo *TII = MF->getSubtarget().getInstrInfo();
767
768 // Check for spills and reloads
769
770 // We assume a single instruction only has a spill or reload, not
771 // both.
772 Optional<unsigned> Size;
773 if ((Size = MI.getRestoreSize(TII))) {
774 CommentOS << *Size << "-byte Reload\n";
775 } else if ((Size = MI.getFoldedRestoreSize(TII))) {
776 if (*Size)
777 CommentOS << *Size << "-byte Folded Reload\n";
778 } else if ((Size = MI.getSpillSize(TII))) {
779 CommentOS << *Size << "-byte Spill\n";
780 } else if ((Size = MI.getFoldedSpillSize(TII))) {
781 if (*Size)
782 CommentOS << *Size << "-byte Folded Spill\n";
783 }
784
785 // Check for spill-induced copies
786 if (MI.getAsmPrinterFlag(MachineInstr::ReloadReuse))
787 CommentOS << " Reload Reuse\n";
788}
789
790/// emitImplicitDef - This method emits the specified machine instruction
791/// that is an implicit def.
792void AsmPrinter::emitImplicitDef(const MachineInstr *MI) const {
793 Register RegNo = MI->getOperand(0).getReg();
794
795 SmallString<128> Str;
796 raw_svector_ostream OS(Str);
797 OS << "implicit-def: "
798 << printReg(RegNo, MF->getSubtarget().getRegisterInfo());
799
800 OutStreamer->AddComment(OS.str());
801 OutStreamer->AddBlankLine();
802}
803
804static void emitKill(const MachineInstr *MI, AsmPrinter &AP) {
805 std::string Str;
806 raw_string_ostream OS(Str);
807 OS << "kill:";
808 for (unsigned i = 0, e = MI->getNumOperands(); i != e; ++i) {
809 const MachineOperand &Op = MI->getOperand(i);
810 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-10~+201911111502510600c19528f1809/llvm/lib/CodeGen/AsmPrinter/AsmPrinter.cpp"
, 810, __PRETTY_FUNCTION__))
;
811 OS << ' ' << (Op.isDef() ? "def " : "killed ")
812 << printReg(Op.getReg(), AP.MF->getSubtarget().getRegisterInfo());
813 }
814 AP.OutStreamer->AddComment(OS.str());
815 AP.OutStreamer->AddBlankLine();
816}
817
818/// emitDebugValueComment - This method handles the target-independent form
819/// of DBG_VALUE, returning true if it was able to do so. A false return
820/// means the target will need to handle MI in EmitInstruction.
821static bool emitDebugValueComment(const MachineInstr *MI, AsmPrinter &AP) {
822 // This code handles only the 4-operand target-independent form.
823 if (MI->getNumOperands() != 4)
824 return false;
825
826 SmallString<128> Str;
827 raw_svector_ostream OS(Str);
828 OS << "DEBUG_VALUE: ";
829
830 const DILocalVariable *V = MI->getDebugVariable();
831 if (auto *SP = dyn_cast<DISubprogram>(V->getScope())) {
832 StringRef Name = SP->getName();
833 if (!Name.empty())
834 OS << Name << ":";
835 }
836 OS << V->getName();
837 OS << " <- ";
838
839 // The second operand is only an offset if it's an immediate.
840 bool MemLoc = MI->getOperand(0).isReg() && MI->getOperand(1).isImm();
841 int64_t Offset = MemLoc ? MI->getOperand(1).getImm() : 0;
842 const DIExpression *Expr = MI->getDebugExpression();
843 if (Expr->getNumElements()) {
844 OS << '[';
845 bool NeedSep = false;
846 for (auto Op : Expr->expr_ops()) {
847 if (NeedSep)
848 OS << ", ";
849 else
850 NeedSep = true;
851 OS << dwarf::OperationEncodingString(Op.getOp());
852 for (unsigned I = 0; I < Op.getNumArgs(); ++I)
853 OS << ' ' << Op.getArg(I);
854 }
855 OS << "] ";
856 }
857
858 // Register or immediate value. Register 0 means undef.
859 if (MI->getOperand(0).isFPImm()) {
860 APFloat APF = APFloat(MI->getOperand(0).getFPImm()->getValueAPF());
861 if (MI->getOperand(0).getFPImm()->getType()->isFloatTy()) {
862 OS << (double)APF.convertToFloat();
863 } else if (MI->getOperand(0).getFPImm()->getType()->isDoubleTy()) {
864 OS << APF.convertToDouble();
865 } else {
866 // There is no good way to print long double. Convert a copy to
867 // double. Ah well, it's only a comment.
868 bool ignored;
869 APF.convert(APFloat::IEEEdouble(), APFloat::rmNearestTiesToEven,
870 &ignored);
871 OS << "(long double) " << APF.convertToDouble();
872 }
873 } else if (MI->getOperand(0).isImm()) {
874 OS << MI->getOperand(0).getImm();
875 } else if (MI->getOperand(0).isCImm()) {
876 MI->getOperand(0).getCImm()->getValue().print(OS, false /*isSigned*/);
877 } else {
878 unsigned Reg;
879 if (MI->getOperand(0).isReg()) {
880 Reg = MI->getOperand(0).getReg();
881 } else {
882 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-10~+201911111502510600c19528f1809/llvm/lib/CodeGen/AsmPrinter/AsmPrinter.cpp"
, 882, __PRETTY_FUNCTION__))
;
883 const TargetFrameLowering *TFI = AP.MF->getSubtarget().getFrameLowering();
884 Offset += TFI->getFrameIndexReference(*AP.MF,
885 MI->getOperand(0).getIndex(), Reg);
886 MemLoc = true;
887 }
888 if (Reg == 0) {
889 // Suppress offset, it is not meaningful here.
890 OS << "undef";
891 // NOTE: Want this comment at start of line, don't emit with AddComment.
892 AP.OutStreamer->emitRawComment(OS.str());
893 return true;
894 }
895 if (MemLoc)
896 OS << '[';
897 OS << printReg(Reg, AP.MF->getSubtarget().getRegisterInfo());
898 }
899
900 if (MemLoc)
901 OS << '+' << Offset << ']';
902
903 // NOTE: Want this comment at start of line, don't emit with AddComment.
904 AP.OutStreamer->emitRawComment(OS.str());
905 return true;
906}
907
908/// This method handles the target-independent form of DBG_LABEL, returning
909/// true if it was able to do so. A false return means the target will need
910/// to handle MI in EmitInstruction.
911static bool emitDebugLabelComment(const MachineInstr *MI, AsmPrinter &AP) {
912 if (MI->getNumOperands() != 1)
913 return false;
914
915 SmallString<128> Str;
916 raw_svector_ostream OS(Str);
917 OS << "DEBUG_LABEL: ";
918
919 const DILabel *V = MI->getDebugLabel();
920 if (auto *SP = dyn_cast<DISubprogram>(
921 V->getScope()->getNonLexicalBlockFileScope())) {
922 StringRef Name = SP->getName();
923 if (!Name.empty())
924 OS << Name << ":";
925 }
926 OS << V->getName();
927
928 // NOTE: Want this comment at start of line, don't emit with AddComment.
929 AP.OutStreamer->emitRawComment(OS.str());
930 return true;
931}
932
933AsmPrinter::CFIMoveType AsmPrinter::needsCFIMoves() const {
934 if (MAI->getExceptionHandlingType() == ExceptionHandling::DwarfCFI &&
935 MF->getFunction().needsUnwindTableEntry())
936 return CFI_M_EH;
937
938 if (MMI->hasDebugInfo() || MF->getTarget().Options.ForceDwarfFrameSection)
939 return CFI_M_Debug;
940
941 return CFI_M_None;
942}
943
944bool AsmPrinter::needsSEHMoves() {
945 return MAI->usesWindowsCFI() && MF->getFunction().needsUnwindTableEntry();
946}
947
948void AsmPrinter::emitCFIInstruction(const MachineInstr &MI) {
949 ExceptionHandling ExceptionHandlingType = MAI->getExceptionHandlingType();
950 if (ExceptionHandlingType != ExceptionHandling::DwarfCFI &&
951 ExceptionHandlingType != ExceptionHandling::ARM)
952 return;
953
954 if (needsCFIMoves() == CFI_M_None)
955 return;
956
957 // If there is no "real" instruction following this CFI instruction, skip
958 // emitting it; it would be beyond the end of the function's FDE range.
959 auto *MBB = MI.getParent();
960 auto I = std::next(MI.getIterator());
961 while (I != MBB->end() && I->isTransient())
962 ++I;
963 if (I == MBB->instr_end() &&
964 MBB->getReverseIterator() == MBB->getParent()->rbegin())
965 return;
966
967 const std::vector<MCCFIInstruction> &Instrs = MF->getFrameInstructions();
968 unsigned CFIIndex = MI.getOperand(0).getCFIIndex();
969 const MCCFIInstruction &CFI = Instrs[CFIIndex];
970 emitCFIInstruction(CFI);
971}
972
973void AsmPrinter::emitFrameAlloc(const MachineInstr &MI) {
974 // The operands are the MCSymbol and the frame offset of the allocation.
975 MCSymbol *FrameAllocSym = MI.getOperand(0).getMCSymbol();
976 int FrameOffset = MI.getOperand(1).getImm();
977
978 // Emit a symbol assignment.
979 OutStreamer->EmitAssignment(FrameAllocSym,
980 MCConstantExpr::create(FrameOffset, OutContext));
981}
982
983void AsmPrinter::emitStackSizeSection(const MachineFunction &MF) {
984 if (!MF.getTarget().Options.EmitStackSizeSection)
985 return;
986
987 MCSection *StackSizeSection =
988 getObjFileLowering().getStackSizesSection(*getCurrentSection());
989 if (!StackSizeSection)
990 return;
991
992 const MachineFrameInfo &FrameInfo = MF.getFrameInfo();
993 // Don't emit functions with dynamic stack allocations.
994 if (FrameInfo.hasVarSizedObjects())
995 return;
996
997 OutStreamer->PushSection();
998 OutStreamer->SwitchSection(StackSizeSection);
999
1000 const MCSymbol *FunctionSymbol = getFunctionBegin();
1001 uint64_t StackSize = FrameInfo.getStackSize();
1002 OutStreamer->EmitSymbolValue(FunctionSymbol, TM.getProgramPointerSize());
1003 OutStreamer->EmitULEB128IntValue(StackSize);
1004
1005 OutStreamer->PopSection();
1006}
1007
1008static bool needFuncLabelsForEHOrDebugInfo(const MachineFunction &MF,
1009 MachineModuleInfo *MMI) {
1010 if (!MF.getLandingPads().empty() || MF.hasEHFunclets() || MMI->hasDebugInfo())
1011 return true;
1012
1013 // We might emit an EH table that uses function begin and end labels even if
1014 // we don't have any landingpads.
1015 if (!MF.getFunction().hasPersonalityFn())
1016 return false;
1017 return !isNoOpWithoutInvoke(
1018 classifyEHPersonality(MF.getFunction().getPersonalityFn()));
1019}
1020
1021/// EmitFunctionBody - This method emits the body and trailer for a
1022/// function.
1023void AsmPrinter::EmitFunctionBody() {
1024 EmitFunctionHeader();
1025
1026 // Emit target-specific gunk before the function body.
1027 EmitFunctionBodyStart();
1028
1029 bool ShouldPrintDebugScopes = MMI->hasDebugInfo();
1030
1031 if (isVerbose()) {
1032 // Get MachineDominatorTree or compute it on the fly if it's unavailable
1033 MDT = getAnalysisIfAvailable<MachineDominatorTree>();
1034 if (!MDT) {
1035 OwnedMDT = std::make_unique<MachineDominatorTree>();
1036 OwnedMDT->getBase().recalculate(*MF);
1037 MDT = OwnedMDT.get();
1038 }
1039
1040 // Get MachineLoopInfo or compute it on the fly if it's unavailable
1041 MLI = getAnalysisIfAvailable<MachineLoopInfo>();
1042 if (!MLI) {
1043 OwnedMLI = std::make_unique<MachineLoopInfo>();
1044 OwnedMLI->getBase().analyze(MDT->getBase());
1045 MLI = OwnedMLI.get();
1046 }
1047 }
1048
1049 // Print out code for the function.
1050 bool HasAnyRealCode = false;
1051 int NumInstsInFunction = 0;
1052 for (auto &MBB : *MF) {
1053 // Print a label for the basic block.
1054 EmitBasicBlockStart(MBB);
1055 for (auto &MI : MBB) {
1056 // Print the assembly for the instruction.
1057 if (!MI.isPosition() && !MI.isImplicitDef() && !MI.isKill() &&
1058 !MI.isDebugInstr()) {
1059 HasAnyRealCode = true;
1060 ++NumInstsInFunction;
1061 }
1062
1063 // If there is a pre-instruction symbol, emit a label for it here.
1064 if (MCSymbol *S = MI.getPreInstrSymbol())
1065 OutStreamer->EmitLabel(S);
1066
1067 if (ShouldPrintDebugScopes) {
1068 for (const HandlerInfo &HI : Handlers) {
1069 NamedRegionTimer T(HI.TimerName, HI.TimerDescription,
1070 HI.TimerGroupName, HI.TimerGroupDescription,
1071 TimePassesIsEnabled);
1072 HI.Handler->beginInstruction(&MI);
1073 }
1074 }
1075
1076 if (isVerbose())
1077 emitComments(MI, OutStreamer->GetCommentOS());
1078
1079 switch (MI.getOpcode()) {
1080 case TargetOpcode::CFI_INSTRUCTION:
1081 emitCFIInstruction(MI);
1082 break;
1083 case TargetOpcode::LOCAL_ESCAPE:
1084 emitFrameAlloc(MI);
1085 break;
1086 case TargetOpcode::ANNOTATION_LABEL:
1087 case TargetOpcode::EH_LABEL:
1088 case TargetOpcode::GC_LABEL:
1089 OutStreamer->EmitLabel(MI.getOperand(0).getMCSymbol());
1090 break;
1091 case TargetOpcode::INLINEASM:
1092 case TargetOpcode::INLINEASM_BR:
1093 EmitInlineAsm(&MI);
1094 break;
1095 case TargetOpcode::DBG_VALUE:
1096 if (isVerbose()) {
1097 if (!emitDebugValueComment(&MI, *this))
1098 EmitInstruction(&MI);
1099 }
1100 break;
1101 case TargetOpcode::DBG_LABEL:
1102 if (isVerbose()) {
1103 if (!emitDebugLabelComment(&MI, *this))
1104 EmitInstruction(&MI);
1105 }
1106 break;
1107 case TargetOpcode::IMPLICIT_DEF:
1108 if (isVerbose()) emitImplicitDef(&MI);
1109 break;
1110 case TargetOpcode::KILL:
1111 if (isVerbose()) emitKill(&MI, *this);
1112 break;
1113 default:
1114 EmitInstruction(&MI);
1115 break;
1116 }
1117
1118 // If there is a post-instruction symbol, emit a label for it here.
1119 if (MCSymbol *S = MI.getPostInstrSymbol())
1120 OutStreamer->EmitLabel(S);
1121
1122 if (ShouldPrintDebugScopes) {
1123 for (const HandlerInfo &HI : Handlers) {
1124 NamedRegionTimer T(HI.TimerName, HI.TimerDescription,
1125 HI.TimerGroupName, HI.TimerGroupDescription,
1126 TimePassesIsEnabled);
1127 HI.Handler->endInstruction();
1128 }
1129 }
1130 }
1131
1132 EmitBasicBlockEnd(MBB);
1133 }
1134
1135 EmittedInsts += NumInstsInFunction;
1136 MachineOptimizationRemarkAnalysis R(DEBUG_TYPE"asm-printer", "InstructionCount",
1137 MF->getFunction().getSubprogram(),
1138 &MF->front());
1139 R << ore::NV("NumInstructions", NumInstsInFunction)
1140 << " instructions in function";
1141 ORE->emit(R);
1142
1143 // If the function is empty and the object file uses .subsections_via_symbols,
1144 // then we need to emit *something* to the function body to prevent the
1145 // labels from collapsing together. Just emit a noop.
1146 // Similarly, don't emit empty functions on Windows either. It can lead to
1147 // duplicate entries (two functions with the same RVA) in the Guard CF Table
1148 // after linking, causing the kernel not to load the binary:
1149 // https://developercommunity.visualstudio.com/content/problem/45366/vc-linker-creates-invalid-dll-with-clang-cl.html
1150 // FIXME: Hide this behind some API in e.g. MCAsmInfo or MCTargetStreamer.
1151 const Triple &TT = TM.getTargetTriple();
1152 if (!HasAnyRealCode && (MAI->hasSubsectionsViaSymbols() ||
1153 (TT.isOSWindows() && TT.isOSBinFormatCOFF()))) {
1154 MCInst Noop;
1155 MF->getSubtarget().getInstrInfo()->getNoop(Noop);
1156
1157 // Targets can opt-out of emitting the noop here by leaving the opcode
1158 // unspecified.
1159 if (Noop.getOpcode()) {
1160 OutStreamer->AddComment("avoids zero-length function");
1161 OutStreamer->EmitInstruction(Noop, getSubtargetInfo());
1162 }
1163 }
1164
1165 const Function &F = MF->getFunction();
1166 for (const auto &BB : F) {
1167 if (!BB.hasAddressTaken())
1168 continue;
1169 MCSymbol *Sym = GetBlockAddressSymbol(&BB);
1170 if (Sym->isDefined())
1171 continue;
1172 OutStreamer->AddComment("Address of block that was removed by CodeGen");
1173 OutStreamer->EmitLabel(Sym);
1174 }
1175
1176 // Emit target-specific gunk after the function body.
1177 EmitFunctionBodyEnd();
1178
1179 if (needFuncLabelsForEHOrDebugInfo(*MF, MMI) ||
1180 MAI->hasDotTypeDotSizeDirective()) {
1181 // Create a symbol for the end of function.
1182 CurrentFnEnd = createTempSymbol("func_end");
1183 OutStreamer->EmitLabel(CurrentFnEnd);
1184 }
1185
1186 // If the target wants a .size directive for the size of the function, emit
1187 // it.
1188 if (MAI->hasDotTypeDotSizeDirective()) {
1189 // We can get the size as difference between the function label and the
1190 // temp label.
1191 const MCExpr *SizeExp = MCBinaryExpr::createSub(
1192 MCSymbolRefExpr::create(CurrentFnEnd, OutContext),
1193 MCSymbolRefExpr::create(CurrentFnSymForSize, OutContext), OutContext);
1194 OutStreamer->emitELFSize(CurrentFnSym, SizeExp);
1195 }
1196
1197 for (const HandlerInfo &HI : Handlers) {
1198 NamedRegionTimer T(HI.TimerName, HI.TimerDescription, HI.TimerGroupName,
1199 HI.TimerGroupDescription, TimePassesIsEnabled);
1200 HI.Handler->markFunctionEnd();
1201 }
1202
1203 // Print out jump tables referenced by the function.
1204 EmitJumpTableInfo();
1205
1206 // Emit post-function debug and/or EH information.
1207 for (const HandlerInfo &HI : Handlers) {
1208 NamedRegionTimer T(HI.TimerName, HI.TimerDescription, HI.TimerGroupName,
1209 HI.TimerGroupDescription, TimePassesIsEnabled);
1210 HI.Handler->endFunction(MF);
1211 }
1212
1213 // Emit section containing stack size metadata.
1214 emitStackSizeSection(*MF);
1215
1216 if (isVerbose())
1217 OutStreamer->GetCommentOS() << "-- End function\n";
1218
1219 OutStreamer->AddBlankLine();
1220}
1221
1222/// Compute the number of Global Variables that uses a Constant.
1223static unsigned getNumGlobalVariableUses(const Constant *C) {
1224 if (!C)
1225 return 0;
1226
1227 if (isa<GlobalVariable>(C))
1228 return 1;
1229
1230 unsigned NumUses = 0;
1231 for (auto *CU : C->users())
1232 NumUses += getNumGlobalVariableUses(dyn_cast<Constant>(CU));
1233
1234 return NumUses;
1235}
1236
1237/// Only consider global GOT equivalents if at least one user is a
1238/// cstexpr inside an initializer of another global variables. Also, don't
1239/// handle cstexpr inside instructions. During global variable emission,
1240/// candidates are skipped and are emitted later in case at least one cstexpr
1241/// isn't replaced by a PC relative GOT entry access.
1242static bool isGOTEquivalentCandidate(const GlobalVariable *GV,
1243 unsigned &NumGOTEquivUsers) {
1244 // Global GOT equivalents are unnamed private globals with a constant
1245 // pointer initializer to another global symbol. They must point to a
1246 // GlobalVariable or Function, i.e., as GlobalValue.
1247 if (!GV->hasGlobalUnnamedAddr() || !GV->hasInitializer() ||
1248 !GV->isConstant() || !GV->isDiscardableIfUnused() ||
1249 !isa<GlobalValue>(GV->getOperand(0)))
1250 return false;
1251
1252 // To be a got equivalent, at least one of its users need to be a constant
1253 // expression used by another global variable.
1254 for (auto *U : GV->users())
1255 NumGOTEquivUsers += getNumGlobalVariableUses(dyn_cast<Constant>(U));
1256
1257 return NumGOTEquivUsers > 0;
1258}
1259
1260/// Unnamed constant global variables solely contaning a pointer to
1261/// another globals variable is equivalent to a GOT table entry; it contains the
1262/// the address of another symbol. Optimize it and replace accesses to these
1263/// "GOT equivalents" by using the GOT entry for the final global instead.
1264/// Compute GOT equivalent candidates among all global variables to avoid
1265/// emitting them if possible later on, after it use is replaced by a GOT entry
1266/// access.
1267void AsmPrinter::computeGlobalGOTEquivs(Module &M) {
1268 if (!getObjFileLowering().supportIndirectSymViaGOTPCRel())
1269 return;
1270
1271 for (const auto &G : M.globals()) {
1272 unsigned NumGOTEquivUsers = 0;
1273 if (!isGOTEquivalentCandidate(&G, NumGOTEquivUsers))
1274 continue;
1275
1276 const MCSymbol *GOTEquivSym = getSymbol(&G);
1277 GlobalGOTEquivs[GOTEquivSym] = std::make_pair(&G, NumGOTEquivUsers);
1278 }
1279}
1280
1281/// Constant expressions using GOT equivalent globals may not be eligible
1282/// for PC relative GOT entry conversion, in such cases we need to emit such
1283/// globals we previously omitted in EmitGlobalVariable.
1284void AsmPrinter::emitGlobalGOTEquivs() {
1285 if (!getObjFileLowering().supportIndirectSymViaGOTPCRel())
1286 return;
1287
1288 SmallVector<const GlobalVariable *, 8> FailedCandidates;
1289 for (auto &I : GlobalGOTEquivs) {
1290 const GlobalVariable *GV = I.second.first;
1291 unsigned Cnt = I.second.second;
1292 if (Cnt)
1293 FailedCandidates.push_back(GV);
1294 }
1295 GlobalGOTEquivs.clear();
1296
1297 for (auto *GV : FailedCandidates)
1298 EmitGlobalVariable(GV);
1299}
1300
1301void AsmPrinter::emitGlobalIndirectSymbol(Module &M,
1302 const GlobalIndirectSymbol& GIS) {
1303 MCSymbol *Name = getSymbol(&GIS);
1304
1305 if (GIS.hasExternalLinkage() || !MAI->getWeakRefDirective())
1306 OutStreamer->EmitSymbolAttribute(Name, MCSA_Global);
1307 else if (GIS.hasWeakLinkage() || GIS.hasLinkOnceLinkage())
1308 OutStreamer->EmitSymbolAttribute(Name, MCSA_WeakReference);
1309 else
1310 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-10~+201911111502510600c19528f1809/llvm/lib/CodeGen/AsmPrinter/AsmPrinter.cpp"
, 1310, __PRETTY_FUNCTION__))
;
1311
1312 bool IsFunction = GIS.getValueType()->isFunctionTy();
1313
1314 // Treat bitcasts of functions as functions also. This is important at least
1315 // on WebAssembly where object and function addresses can't alias each other.
1316 if (!IsFunction)
1317 if (auto *CE = dyn_cast<ConstantExpr>(GIS.getIndirectSymbol()))
1318 if (CE->getOpcode() == Instruction::BitCast)
1319 IsFunction =
1320 CE->getOperand(0)->getType()->getPointerElementType()->isFunctionTy();
1321
1322 // Set the symbol type to function if the alias has a function type.
1323 // This affects codegen when the aliasee is not a function.
1324 if (IsFunction)
1325 OutStreamer->EmitSymbolAttribute(Name, isa<GlobalIFunc>(GIS)
1326 ? MCSA_ELF_TypeIndFunction
1327 : MCSA_ELF_TypeFunction);
1328
1329 EmitVisibility(Name, GIS.getVisibility());
1330
1331 const MCExpr *Expr = lowerConstant(GIS.getIndirectSymbol());
1332
1333 if (isa<GlobalAlias>(&GIS) && MAI->hasAltEntry() && isa<MCBinaryExpr>(Expr))
1334 OutStreamer->EmitSymbolAttribute(Name, MCSA_AltEntry);
1335
1336 // Emit the directives as assignments aka .set:
1337 OutStreamer->EmitAssignment(Name, Expr);
1338
1339 if (auto *GA = dyn_cast<GlobalAlias>(&GIS)) {
1340 // If the aliasee does not correspond to a symbol in the output, i.e. the
1341 // alias is not of an object or the aliased object is private, then set the
1342 // size of the alias symbol from the type of the alias. We don't do this in
1343 // other situations as the alias and aliasee having differing types but same
1344 // size may be intentional.
1345 const GlobalObject *BaseObject = GA->getBaseObject();
1346 if (MAI->hasDotTypeDotSizeDirective() && GA->getValueType()->isSized() &&
1347 (!BaseObject || BaseObject->hasPrivateLinkage())) {
1348 const DataLayout &DL = M.getDataLayout();
1349 uint64_t Size = DL.getTypeAllocSize(GA->getValueType());
1350 OutStreamer->emitELFSize(Name, MCConstantExpr::create(Size, OutContext));
1351 }
1352 }
1353}
1354
1355void AsmPrinter::emitRemarksSection(RemarkStreamer &RS) {
1356 if (!RS.needsSection())
1357 return;
1358
1359 remarks::RemarkSerializer &RemarkSerializer = RS.getSerializer();
1360
1361 Optional<SmallString<128>> Filename;
1362 if (Optional<StringRef> FilenameRef = RS.getFilename()) {
1363 Filename = *FilenameRef;
1364 sys::fs::make_absolute(*Filename);
1365 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-10~+201911111502510600c19528f1809/llvm/lib/CodeGen/AsmPrinter/AsmPrinter.cpp"
, 1365, __PRETTY_FUNCTION__))
;
1366 }
1367
1368 std::string Buf;
1369 raw_string_ostream OS(Buf);
1370 std::unique_ptr<remarks::MetaSerializer> MetaSerializer =
1371 Filename ? RemarkSerializer.metaSerializer(OS, StringRef(*Filename))
1372 : RemarkSerializer.metaSerializer(OS);
1373 MetaSerializer->emit();
1374
1375 // Switch to the remarks section.
1376 MCSection *RemarksSection =
1377 OutContext.getObjectFileInfo()->getRemarksSection();
1378 OutStreamer->SwitchSection(RemarksSection);
1379
1380 OutStreamer->EmitBinaryData(OS.str());
1381}
1382
1383bool AsmPrinter::doFinalization(Module &M) {
1384 // Set the MachineFunction to nullptr so that we can catch attempted
1385 // accesses to MF specific features at the module level and so that
1386 // we can conditionalize accesses based on whether or not it is nullptr.
1387 MF = nullptr;
1388
1389 // Gather all GOT equivalent globals in the module. We really need two
1390 // passes over the globals: one to compute and another to avoid its emission
1391 // in EmitGlobalVariable, otherwise we would not be able to handle cases
1392 // where the got equivalent shows up before its use.
1393 computeGlobalGOTEquivs(M);
1394
1395 // Emit global variables.
1396 for (const auto &G : M.globals())
1397 EmitGlobalVariable(&G);
1398
1399 // Emit remaining GOT equivalent globals.
1400 emitGlobalGOTEquivs();
1401
1402 // Emit visibility info for declarations
1403 for (const Function &F : M) {
1404 if (!F.isDeclarationForLinker())
1405 continue;
1406 GlobalValue::VisibilityTypes V = F.getVisibility();
1407 if (V == GlobalValue::DefaultVisibility)
1408 continue;
1409
1410 MCSymbol *Name = getSymbol(&F);
1411 EmitVisibility(Name, V, false);
1412 }
1413
1414 // Emit the remarks section contents.
1415 // FIXME: Figure out when is the safest time to emit this section. It should
1416 // not come after debug info.
1417 if (RemarkStreamer *RS = M.getContext().getRemarkStreamer())
1418 emitRemarksSection(*RS);
1419
1420 const TargetLoweringObjectFile &TLOF = getObjFileLowering();
1421
1422 TLOF.emitModuleMetadata(*OutStreamer, M);
1423
1424 if (TM.getTargetTriple().isOSBinFormatELF()) {
1425 MachineModuleInfoELF &MMIELF = MMI->getObjFileInfo<MachineModuleInfoELF>();
1426
1427 // Output stubs for external and common global variables.
1428 MachineModuleInfoELF::SymbolListTy Stubs = MMIELF.GetGVStubList();
1429 if (!Stubs.empty()) {
1430 OutStreamer->SwitchSection(TLOF.getDataSection());
1431 const DataLayout &DL = M.getDataLayout();
1432
1433 EmitAlignment(Align(DL.getPointerSize()));
1434 for (const auto &Stub : Stubs) {
1435 OutStreamer->EmitLabel(Stub.first);
1436 OutStreamer->EmitSymbolValue(Stub.second.getPointer(),
1437 DL.getPointerSize());
1438 }
1439 }
1440 }
1441
1442 if (TM.getTargetTriple().isOSBinFormatCOFF()) {
1443 MachineModuleInfoCOFF &MMICOFF =
1444 MMI->getObjFileInfo<MachineModuleInfoCOFF>();
1445
1446 // Output stubs for external and common global variables.
1447 MachineModuleInfoCOFF::SymbolListTy Stubs = MMICOFF.GetGVStubList();
1448 if (!Stubs.empty()) {
1449 const DataLayout &DL = M.getDataLayout();
1450
1451 for (const auto &Stub : Stubs) {
1452 SmallString<256> SectionName = StringRef(".rdata$");
1453 SectionName += Stub.first->getName();
1454 OutStreamer->SwitchSection(OutContext.getCOFFSection(
1455 SectionName,
1456 COFF::IMAGE_SCN_CNT_INITIALIZED_DATA | COFF::IMAGE_SCN_MEM_READ |
1457 COFF::IMAGE_SCN_LNK_COMDAT,
1458 SectionKind::getReadOnly(), Stub.first->getName(),
1459 COFF::IMAGE_COMDAT_SELECT_ANY));
1460 EmitAlignment(Align(DL.getPointerSize()));
1461 OutStreamer->EmitSymbolAttribute(Stub.first, MCSA_Global);
1462 OutStreamer->EmitLabel(Stub.first);
1463 OutStreamer->EmitSymbolValue(Stub.second.getPointer(),
1464 DL.getPointerSize());
1465 }
1466 }
1467 }
1468
1469 // Finalize debug and EH information.
1470 for (const HandlerInfo &HI : Handlers) {
1471 NamedRegionTimer T(HI.TimerName, HI.TimerDescription, HI.TimerGroupName,
1472 HI.TimerGroupDescription, TimePassesIsEnabled);
1473 HI.Handler->endModule();
1474 }
1475 Handlers.clear();
1476 DD = nullptr;
1477
1478 // If the target wants to know about weak references, print them all.
1479 if (MAI->getWeakRefDirective()) {
1480 // FIXME: This is not lazy, it would be nice to only print weak references
1481 // to stuff that is actually used. Note that doing so would require targets
1482 // to notice uses in operands (due to constant exprs etc). This should
1483 // happen with the MC stuff eventually.
1484
1485 // Print out module-level global objects here.
1486 for (const auto &GO : M.global_objects()) {
1487 if (!GO.hasExternalWeakLinkage())
1488 continue;
1489 OutStreamer->EmitSymbolAttribute(getSymbol(&GO), MCSA_WeakReference);
1490 }
1491 }
1492
1493 // Print aliases in topological order, that is, for each alias a = b,
1494 // b must be printed before a.
1495 // This is because on some targets (e.g. PowerPC) linker expects aliases in
1496 // such an order to generate correct TOC information.
1497 SmallVector<const GlobalAlias *, 16> AliasStack;
1498 SmallPtrSet<const GlobalAlias *, 16> AliasVisited;
1499 for (const auto &Alias : M.aliases()) {
1500 for (const GlobalAlias *Cur = &Alias; Cur;
1501 Cur = dyn_cast<GlobalAlias>(Cur->getAliasee())) {
1502 if (!AliasVisited.insert(Cur).second)
1503 break;
1504 AliasStack.push_back(Cur);
1505 }
1506 for (const GlobalAlias *AncestorAlias : llvm::reverse(AliasStack))
1507 emitGlobalIndirectSymbol(M, *AncestorAlias);
1508 AliasStack.clear();
1509 }
1510 for (const auto &IFunc : M.ifuncs())
1511 emitGlobalIndirectSymbol(M, IFunc);
1512
1513 GCModuleInfo *MI = getAnalysisIfAvailable<GCModuleInfo>();
1514 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-10~+201911111502510600c19528f1809/llvm/lib/CodeGen/AsmPrinter/AsmPrinter.cpp"
, 1514, __PRETTY_FUNCTION__))
;
1515 for (GCModuleInfo::iterator I = MI->end(), E = MI->begin(); I != E; )
1516 if (GCMetadataPrinter *MP = GetOrCreateGCPrinter(**--I))
1517 MP->finishAssembly(M, *MI, *this);
1518
1519 // Emit llvm.ident metadata in an '.ident' directive.
1520 EmitModuleIdents(M);
1521
1522 // Emit bytes for llvm.commandline metadata.
1523 EmitModuleCommandLines(M);
1524
1525 // Emit __morestack address if needed for indirect calls.
1526 if (MMI->usesMorestackAddr()) {
1527 unsigned Align = 1;
1528 MCSection *ReadOnlySection = getObjFileLowering().getSectionForConstant(
1529 getDataLayout(), SectionKind::getReadOnly(),
1530 /*C=*/nullptr, Align);
1531 OutStreamer->SwitchSection(ReadOnlySection);
1532
1533 MCSymbol *AddrSymbol =
1534 OutContext.getOrCreateSymbol(StringRef("__morestack_addr"));
1535 OutStreamer->EmitLabel(AddrSymbol);
1536
1537 unsigned PtrSize = MAI->getCodePointerSize();
1538 OutStreamer->EmitSymbolValue(GetExternalSymbolSymbol("__morestack"),
1539 PtrSize);
1540 }
1541
1542 // Emit .note.GNU-split-stack and .note.GNU-no-split-stack sections if
1543 // split-stack is used.
1544 if (TM.getTargetTriple().isOSBinFormatELF() && MMI->hasSplitStack()) {
1545 OutStreamer->SwitchSection(
1546 OutContext.getELFSection(".note.GNU-split-stack", ELF::SHT_PROGBITS, 0));
1547 if (MMI->hasNosplitStack())
1548 OutStreamer->SwitchSection(
1549 OutContext.getELFSection(".note.GNU-no-split-stack", ELF::SHT_PROGBITS, 0));
1550 }
1551
1552 // If we don't have any trampolines, then we don't require stack memory
1553 // to be executable. Some targets have a directive to declare this.
1554 Function *InitTrampolineIntrinsic = M.getFunction("llvm.init.trampoline");
1555 if (!InitTrampolineIntrinsic || InitTrampolineIntrinsic->use_empty())
1556 if (MCSection *S = MAI->getNonexecutableStackSection(OutContext))
1557 OutStreamer->SwitchSection(S);
1558
1559 if (TM.getTargetTriple().isOSBinFormatCOFF()) {
1560 // Emit /EXPORT: flags for each exported global as necessary.
1561 const auto &TLOF = getObjFileLowering();
1562 std::string Flags;
1563
1564 for (const GlobalValue &GV : M.global_values()) {
1565 raw_string_ostream OS(Flags);
1566 TLOF.emitLinkerFlagsForGlobal(OS, &GV);
1567 OS.flush();
1568 if (!Flags.empty()) {
1569 OutStreamer->SwitchSection(TLOF.getDrectveSection());
1570 OutStreamer->EmitBytes(Flags);
1571 }
1572 Flags.clear();
1573 }
1574
1575 // Emit /INCLUDE: flags for each used global as necessary.
1576 if (const auto *LU = M.getNamedGlobal("llvm.used")) {
1577 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-10~+201911111502510600c19528f1809/llvm/lib/CodeGen/AsmPrinter/AsmPrinter.cpp"
, 1578, __PRETTY_FUNCTION__))
1578 "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-10~+201911111502510600c19528f1809/llvm/lib/CodeGen/AsmPrinter/AsmPrinter.cpp"
, 1578, __PRETTY_FUNCTION__))
;
1579 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-10~+201911111502510600c19528f1809/llvm/lib/CodeGen/AsmPrinter/AsmPrinter.cpp"
, 1580, __PRETTY_FUNCTION__))
1580 "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-10~+201911111502510600c19528f1809/llvm/lib/CodeGen/AsmPrinter/AsmPrinter.cpp"
, 1580, __PRETTY_FUNCTION__))
;
1581 if (const auto *A = cast<ConstantArray>(LU->getInitializer())) {
1582 for (const Value *Op : A->operands()) {
1583 const auto *GV = cast<GlobalValue>(Op->stripPointerCasts());
1584 // Global symbols with internal or private linkage are not visible to
1585 // the linker, and thus would cause an error when the linker tried to
1586 // preserve the symbol due to the `/include:` directive.
1587 if (GV->hasLocalLinkage())
1588 continue;
1589
1590 raw_string_ostream OS(Flags);
1591 TLOF.emitLinkerFlagsForUsed(OS, GV);
1592 OS.flush();
1593
1594 if (!Flags.empty()) {
1595 OutStreamer->SwitchSection(TLOF.getDrectveSection());
1596 OutStreamer->EmitBytes(Flags);
1597 }
1598 Flags.clear();
1599 }
1600 }
1601 }
1602 }
1603
1604 if (TM.Options.EmitAddrsig) {
1605 // Emit address-significance attributes for all globals.
1606 OutStreamer->EmitAddrsig();
1607 for (const GlobalValue &GV : M.global_values())
1608 if (!GV.use_empty() && !GV.isThreadLocal() &&
1609 !GV.hasDLLImportStorageClass() && !GV.getName().startswith("llvm.") &&
1610 !GV.hasAtLeastLocalUnnamedAddr())
1611 OutStreamer->EmitAddrsigSym(getSymbol(&GV));
1612 }
1613
1614 // Emit symbol partition specifications (ELF only).
1615 if (TM.getTargetTriple().isOSBinFormatELF()) {
1616 unsigned UniqueID = 0;
1617 for (const GlobalValue &GV : M.global_values()) {
1618 if (!GV.hasPartition() || GV.isDeclarationForLinker() ||
1619 GV.getVisibility() != GlobalValue::DefaultVisibility)
1620 continue;
1621
1622 OutStreamer->SwitchSection(OutContext.getELFSection(
1623 ".llvm_sympart", ELF::SHT_LLVM_SYMPART, 0, 0, "", ++UniqueID));
1624 OutStreamer->EmitBytes(GV.getPartition());
1625 OutStreamer->EmitZeros(1);
1626 OutStreamer->EmitValue(
1627 MCSymbolRefExpr::create(getSymbol(&GV), OutContext),
1628 MAI->getCodePointerSize());
1629 }
1630 }
1631
1632 // Allow the target to emit any magic that it wants at the end of the file,
1633 // after everything else has gone out.
1634 EmitEndOfAsmFile(M);
1635
1636 MMI = nullptr;
1637
1638 OutStreamer->Finish();
1639 OutStreamer->reset();
1640 OwnedMLI.reset();
1641 OwnedMDT.reset();
1642
1643 return false;
1644}
1645
1646MCSymbol *AsmPrinter::getCurExceptionSym() {
1647 if (!CurExceptionSym)
1648 CurExceptionSym = createTempSymbol("exception");
1649 return CurExceptionSym;
1650}
1651
1652void AsmPrinter::SetupMachineFunction(MachineFunction &MF) {
1653 this->MF = &MF;
1654
1655 // Get the function symbol.
1656 if (MAI->needsFunctionDescriptors()) {
1657 assert(TM.getTargetTriple().isOSAIX() && "Function descriptor is only"((TM.getTargetTriple().isOSAIX() && "Function descriptor is only"
" supported on AIX.") ? static_cast<void> (0) : __assert_fail
("TM.getTargetTriple().isOSAIX() && \"Function descriptor is only\" \" supported on AIX.\""
, "/build/llvm-toolchain-snapshot-10~+201911111502510600c19528f1809/llvm/lib/CodeGen/AsmPrinter/AsmPrinter.cpp"
, 1658, __PRETTY_FUNCTION__))
1658 " supported on AIX.")((TM.getTargetTriple().isOSAIX() && "Function descriptor is only"
" supported on AIX.") ? static_cast<void> (0) : __assert_fail
("TM.getTargetTriple().isOSAIX() && \"Function descriptor is only\" \" supported on AIX.\""
, "/build/llvm-toolchain-snapshot-10~+201911111502510600c19528f1809/llvm/lib/CodeGen/AsmPrinter/AsmPrinter.cpp"
, 1658, __PRETTY_FUNCTION__))
;
1659 assert(CurrentFnDescSym && "The function descriptor symbol needs to be"((CurrentFnDescSym && "The function descriptor symbol needs to be"
" initalized first.") ? static_cast<void> (0) : __assert_fail
("CurrentFnDescSym && \"The function descriptor symbol needs to be\" \" initalized first.\""
, "/build/llvm-toolchain-snapshot-10~+201911111502510600c19528f1809/llvm/lib/CodeGen/AsmPrinter/AsmPrinter.cpp"
, 1660, __PRETTY_FUNCTION__))
1660 " initalized first.")((CurrentFnDescSym && "The function descriptor symbol needs to be"
" initalized first.") ? static_cast<void> (0) : __assert_fail
("CurrentFnDescSym && \"The function descriptor symbol needs to be\" \" initalized first.\""
, "/build/llvm-toolchain-snapshot-10~+201911111502510600c19528f1809/llvm/lib/CodeGen/AsmPrinter/AsmPrinter.cpp"
, 1660, __PRETTY_FUNCTION__))
;
1661
1662 // Get the function entry point symbol.
1663 CurrentFnSym =
1664 OutContext.getOrCreateSymbol("." + CurrentFnDescSym->getName());
1665
1666 const Function &F = MF.getFunction();
1667 MCSectionXCOFF *FnEntryPointSec =
1668 cast<MCSectionXCOFF>(getObjFileLowering().SectionForGlobal(&F, TM));
1669 // Set the containing csect.
1670 cast<MCSymbolXCOFF>(CurrentFnSym)->setContainingCsect(FnEntryPointSec);
1671 } else {
1672 CurrentFnSym = getSymbol(&MF.getFunction());
1673 }
1674
1675 CurrentFnSymForSize = CurrentFnSym;
1676 CurrentFnBegin = nullptr;
1677 CurExceptionSym = nullptr;
1678 bool NeedsLocalForSize = MAI->needsLocalForSize();
1679 if (needFuncLabelsForEHOrDebugInfo(MF, MMI) || NeedsLocalForSize ||
1680 MF.getTarget().Options.EmitStackSizeSection) {
1681 CurrentFnBegin = createTempSymbol("func_begin");
1682 if (NeedsLocalForSize)
1683 CurrentFnSymForSize = CurrentFnBegin;
1684 }
1685
1686 ORE = &getAnalysis<MachineOptimizationRemarkEmitterPass>().getORE();
1687}
1688
1689namespace {
1690
1691// Keep track the alignment, constpool entries per Section.
1692 struct SectionCPs {
1693 MCSection *S;
1694 unsigned Alignment;
1695 SmallVector<unsigned, 4> CPEs;
1696
1697 SectionCPs(MCSection *s, unsigned a) : S(s), Alignment(a) {}
1698 };
1699
1700} // end anonymous namespace
1701
1702/// EmitConstantPool - Print to the current output stream assembly
1703/// representations of the constants in the constant pool MCP. This is
1704/// used to print out constants which have been "spilled to memory" by
1705/// the code generator.
1706void AsmPrinter::EmitConstantPool() {
1707 const MachineConstantPool *MCP = MF->getConstantPool();
1708 const std::vector<MachineConstantPoolEntry> &CP = MCP->getConstants();
1709 if (CP.empty()) return;
1710
1711 // Calculate sections for constant pool entries. We collect entries to go into
1712 // the same section together to reduce amount of section switch statements.
1713 SmallVector<SectionCPs, 4> CPSections;
1714 for (unsigned i = 0, e = CP.size(); i != e; ++i) {
1715 const MachineConstantPoolEntry &CPE = CP[i];
1716 unsigned Align = CPE.getAlignment();
1717
1718 SectionKind Kind = CPE.getSectionKind(&getDataLayout());
1719
1720 const Constant *C = nullptr;
1721 if (!CPE.isMachineConstantPoolEntry())
1722 C = CPE.Val.ConstVal;
1723
1724 MCSection *S = getObjFileLowering().getSectionForConstant(getDataLayout(),
1725 Kind, C, Align);
1726
1727 // The number of sections are small, just do a linear search from the
1728 // last section to the first.
1729 bool Found = false;
1730 unsigned SecIdx = CPSections.size();
1731 while (SecIdx != 0) {
1732 if (CPSections[--SecIdx].S == S) {
1733 Found = true;
1734 break;
1735 }
1736 }
1737 if (!Found) {
1738 SecIdx = CPSections.size();
1739 CPSections.push_back(SectionCPs(S, Align));
1740 }
1741
1742 if (Align > CPSections[SecIdx].Alignment)
1743 CPSections[SecIdx].Alignment = Align;
1744 CPSections[SecIdx].CPEs.push_back(i);
1745 }
1746
1747 // Now print stuff into the calculated sections.
1748 const MCSection *CurSection = nullptr;
1749 unsigned Offset = 0;
1750 for (unsigned i = 0, e = CPSections.size(); i != e; ++i) {
1751 for (unsigned j = 0, ee = CPSections[i].CPEs.size(); j != ee; ++j) {
1752 unsigned CPI = CPSections[i].CPEs[j];
1753 MCSymbol *Sym = GetCPISymbol(CPI);
1754 if (!Sym->isUndefined())
1755 continue;
1756
1757 if (CurSection != CPSections[i].S) {
1758 OutStreamer->SwitchSection(CPSections[i].S);
1759 EmitAlignment(Align(CPSections[i].Alignment));
1760 CurSection = CPSections[i].S;
1761 Offset = 0;
1762 }
1763
1764 MachineConstantPoolEntry CPE = CP[CPI];
1765
1766 // Emit inter-object padding for alignment.
1767 unsigned AlignMask = CPE.getAlignment() - 1;
1768 unsigned NewOffset = (Offset + AlignMask) & ~AlignMask;
1769 OutStreamer->EmitZeros(NewOffset - Offset);
1770
1771 Type *Ty = CPE.getType();
1772 Offset = NewOffset + getDataLayout().getTypeAllocSize(Ty);
1773
1774 OutStreamer->EmitLabel(Sym);
1775 if (CPE.isMachineConstantPoolEntry())
1776 EmitMachineConstantPoolValue(CPE.Val.MachineCPVal);
1777 else
1778 EmitGlobalConstant(getDataLayout(), CPE.Val.ConstVal);
1779 }
1780 }
1781}
1782
1783/// EmitJumpTableInfo - Print assembly representations of the jump tables used
1784/// by the current function to the current output stream.
1785void AsmPrinter::EmitJumpTableInfo() {
1786 const DataLayout &DL = MF->getDataLayout();
1787 const MachineJumpTableInfo *MJTI = MF->getJumpTableInfo();
1788 if (!MJTI) return;
1789 if (MJTI->getEntryKind() == MachineJumpTableInfo::EK_Inline) return;
1790 const std::vector<MachineJumpTableEntry> &JT = MJTI->getJumpTables();
1791 if (JT.empty()) return;
1792
1793 // Pick the directive to use to print the jump table entries, and switch to
1794 // the appropriate section.
1795 const Function &F = MF->getFunction();
1796 const TargetLoweringObjectFile &TLOF = getObjFileLowering();
1797 bool JTInDiffSection = !TLOF.shouldPutJumpTableInFunctionSection(
1798 MJTI->getEntryKind() == MachineJumpTableInfo::EK_LabelDifference32,
1799 F);
1800 if (JTInDiffSection) {
1801 // Drop it in the readonly section.
1802 MCSection *ReadOnlySection = TLOF.getSectionForJumpTable(F, TM);
1803 OutStreamer->SwitchSection(ReadOnlySection);
1804 }
1805
1806 EmitAlignment(Align(MJTI->getEntryAlignment(DL)));
1807
1808 // Jump tables in code sections are marked with a data_region directive
1809 // where that's supported.
1810 if (!JTInDiffSection)
1811 OutStreamer->EmitDataRegion(MCDR_DataRegionJT32);
1812
1813 for (unsigned JTI = 0, e = JT.size(); JTI != e; ++JTI) {
1814 const std::vector<MachineBasicBlock*> &JTBBs = JT[JTI].MBBs;
1815
1816 // If this jump table was deleted, ignore it.
1817 if (JTBBs.empty()) continue;
1818
1819 // For the EK_LabelDifference32 entry, if using .set avoids a relocation,
1820 /// emit a .set directive for each unique entry.
1821 if (MJTI->getEntryKind() == MachineJumpTableInfo::EK_LabelDifference32 &&
1822 MAI->doesSetDirectiveSuppressReloc()) {
1823 SmallPtrSet<const MachineBasicBlock*, 16> EmittedSets;
1824 const TargetLowering *TLI = MF->getSubtarget().getTargetLowering();
1825 const MCExpr *Base = TLI->getPICJumpTableRelocBaseExpr(MF,JTI,OutContext);
1826 for (unsigned ii = 0, ee = JTBBs.size(); ii != ee; ++ii) {
1827 const MachineBasicBlock *MBB = JTBBs[ii];
1828 if (!EmittedSets.insert(MBB).second)
1829 continue;
1830
1831 // .set LJTSet, LBB32-base
1832 const MCExpr *LHS =
1833 MCSymbolRefExpr::create(MBB->getSymbol(), OutContext);
1834 OutStreamer->EmitAssignment(GetJTSetSymbol(JTI, MBB->getNumber()),
1835 MCBinaryExpr::createSub(LHS, Base,
1836 OutContext));
1837 }
1838 }
1839
1840 // On some targets (e.g. Darwin) we want to emit two consecutive labels
1841 // before each jump table. The first label is never referenced, but tells
1842 // the assembler and linker the extents of the jump table object. The
1843 // second label is actually referenced by the code.
1844 if (JTInDiffSection && DL.hasLinkerPrivateGlobalPrefix())
1845 // FIXME: This doesn't have to have any specific name, just any randomly
1846 // named and numbered 'l' label would work. Simplify GetJTISymbol.
1847 OutStreamer->EmitLabel(GetJTISymbol(JTI, true));
1848
1849 OutStreamer->EmitLabel(GetJTISymbol(JTI));
1850
1851 for (unsigned ii = 0, ee = JTBBs.size(); ii != ee; ++ii)
1852 EmitJumpTableEntry(MJTI, JTBBs[ii], JTI);
1853 }
1854 if (!JTInDiffSection)
1855 OutStreamer->EmitDataRegion(MCDR_DataRegionEnd);
1856}
1857
1858/// EmitJumpTableEntry - Emit a jump table entry for the specified MBB to the
1859/// current stream.
1860void AsmPrinter::EmitJumpTableEntry(const MachineJumpTableInfo *MJTI,
1861 const MachineBasicBlock *MBB,
1862 unsigned UID) const {
1863 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-10~+201911111502510600c19528f1809/llvm/lib/CodeGen/AsmPrinter/AsmPrinter.cpp"
, 1863, __PRETTY_FUNCTION__))
;
1864 const MCExpr *Value = nullptr;
1865 switch (MJTI->getEntryKind()) {
1866 case MachineJumpTableInfo::EK_Inline:
1867 llvm_unreachable("Cannot emit EK_Inline jump table entry")::llvm::llvm_unreachable_internal("Cannot emit EK_Inline jump table entry"
, "/build/llvm-toolchain-snapshot-10~+201911111502510600c19528f1809/llvm/lib/CodeGen/AsmPrinter/AsmPrinter.cpp"
, 1867)
;
1868 case MachineJumpTableInfo::EK_Custom32:
1869 Value = MF->getSubtarget().getTargetLowering()->LowerCustomJumpTableEntry(
1870 MJTI, MBB, UID, OutContext);
1871 break;
1872 case MachineJumpTableInfo::EK_BlockAddress:
1873 // EK_BlockAddress - Each entry is a plain address of block, e.g.:
1874 // .word LBB123
1875 Value = MCSymbolRefExpr::create(MBB->getSymbol(), OutContext);
1876 break;
1877 case MachineJumpTableInfo::EK_GPRel32BlockAddress: {
1878 // EK_GPRel32BlockAddress - Each entry is an address of block, encoded
1879 // with a relocation as gp-relative, e.g.:
1880 // .gprel32 LBB123
1881 MCSymbol *MBBSym = MBB->getSymbol();
1882 OutStreamer->EmitGPRel32Value(MCSymbolRefExpr::create(MBBSym, OutContext));
1883 return;
1884 }
1885
1886 case MachineJumpTableInfo::EK_GPRel64BlockAddress: {
1887 // EK_GPRel64BlockAddress - Each entry is an address of block, encoded
1888 // with a relocation as gp-relative, e.g.:
1889 // .gpdword LBB123
1890 MCSymbol *MBBSym = MBB->getSymbol();
1891 OutStreamer->EmitGPRel64Value(MCSymbolRefExpr::create(MBBSym, OutContext));
1892 return;
1893 }
1894
1895 case MachineJumpTableInfo::EK_LabelDifference32: {
1896 // Each entry is the address of the block minus the address of the jump
1897 // table. This is used for PIC jump tables where gprel32 is not supported.
1898 // e.g.:
1899 // .word LBB123 - LJTI1_2
1900 // If the .set directive avoids relocations, this is emitted as:
1901 // .set L4_5_set_123, LBB123 - LJTI1_2
1902 // .word L4_5_set_123
1903 if (MAI->doesSetDirectiveSuppressReloc()) {
1904 Value = MCSymbolRefExpr::create(GetJTSetSymbol(UID, MBB->getNumber()),
1905 OutContext);
1906 break;
1907 }
1908 Value = MCSymbolRefExpr::create(MBB->getSymbol(), OutContext);
1909 const TargetLowering *TLI = MF->getSubtarget().getTargetLowering();
1910 const MCExpr *Base = TLI->getPICJumpTableRelocBaseExpr(MF, UID, OutContext);
1911 Value = MCBinaryExpr::createSub(Value, Base, OutContext);
1912 break;
1913 }
1914 }
1915
1916 assert(Value && "Unknown entry kind!")((Value && "Unknown entry kind!") ? static_cast<void
> (0) : __assert_fail ("Value && \"Unknown entry kind!\""
, "/build/llvm-toolchain-snapshot-10~+201911111502510600c19528f1809/llvm/lib/CodeGen/AsmPrinter/AsmPrinter.cpp"
, 1916, __PRETTY_FUNCTION__))
;
1917
1918 unsigned EntrySize = MJTI->getEntrySize(getDataLayout());
1919 OutStreamer->EmitValue(Value, EntrySize);
1920}
1921
1922/// EmitSpecialLLVMGlobal - Check to see if the specified global is a
1923/// special global used by LLVM. If so, emit it and return true, otherwise
1924/// do nothing and return false.
1925bool AsmPrinter::EmitSpecialLLVMGlobal(const GlobalVariable *GV) {
1926 if (GV->getName() == "llvm.used") {
1927 if (MAI->hasNoDeadStrip()) // No need to emit this at all.
1928 EmitLLVMUsedList(cast<ConstantArray>(GV->getInitializer()));
1929 return true;
1930 }
1931
1932 // Ignore debug and non-emitted data. This handles llvm.compiler.used.
1933 if (GV->getSection() == "llvm.metadata" ||
1934 GV->hasAvailableExternallyLinkage())
1935 return true;
1936
1937 if (!GV->hasAppendingLinkage()) return false;
1938
1939 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-10~+201911111502510600c19528f1809/llvm/lib/CodeGen/AsmPrinter/AsmPrinter.cpp"
, 1939, __PRETTY_FUNCTION__))
;
1940
1941 if (GV->getName() == "llvm.global_ctors") {
1942 EmitXXStructorList(GV->getParent()->getDataLayout(), GV->getInitializer(),
1943 /* isCtor */ true);
1944
1945 return true;
1946 }
1947
1948 if (GV->getName() == "llvm.global_dtors") {
1949 EmitXXStructorList(GV->getParent()->getDataLayout(), GV->getInitializer(),
1950 /* isCtor */ false);
1951
1952 return true;
1953 }
1954
1955 report_fatal_error("unknown special variable");
1956}
1957
1958/// EmitLLVMUsedList - For targets that define a MAI::UsedDirective, mark each
1959/// global in the specified llvm.used list.
1960void AsmPrinter::EmitLLVMUsedList(const ConstantArray *InitList) {
1961 // Should be an array of 'i8*'.
1962 for (unsigned i = 0, e = InitList->getNumOperands(); i != e; ++i) {
1963 const GlobalValue *GV =
1964 dyn_cast<GlobalValue>(InitList->getOperand(i)->stripPointerCasts());
1965 if (GV)
1966 OutStreamer->EmitSymbolAttribute(getSymbol(GV), MCSA_NoDeadStrip);
1967 }
1968}
1969
1970namespace {
1971
1972struct Structor {
1973 int Priority = 0;
1974 Constant *Func = nullptr;
1975 GlobalValue *ComdatKey = nullptr;
1976
1977 Structor() = default;
1978};
1979
1980} // end anonymous namespace
1981
1982/// EmitXXStructorList - Emit the ctor or dtor list taking into account the init
1983/// priority.
1984void AsmPrinter::EmitXXStructorList(const DataLayout &DL, const Constant *List,
1985 bool isCtor) {
1986 // Should be an array of '{ i32, void ()*, i8* }' structs. The first value is the
1987 // init priority.
1988 if (!isa<ConstantArray>(List)) return;
1989
1990 // Sanity check the structors list.
1991 const ConstantArray *InitList = dyn_cast<ConstantArray>(List);
1992 if (!InitList) return; // Not an array!
1993 StructType *ETy = dyn_cast<StructType>(InitList->getType()->getElementType());
1994 if (!ETy || ETy->getNumElements() != 3 ||
1995 !isa<IntegerType>(ETy->getTypeAtIndex(0U)) ||
1996 !isa<PointerType>(ETy->getTypeAtIndex(1U)) ||
1997 !isa<PointerType>(ETy->getTypeAtIndex(2U)))
1998 return; // Not (int, ptr, ptr).
1999
2000 // Gather the structors in a form that's convenient for sorting by priority.
2001 SmallVector<Structor, 8> Structors;
2002 for (Value *O : InitList->operands()) {
2003 ConstantStruct *CS = dyn_cast<ConstantStruct>(O);
2004 if (!CS) continue; // Malformed.
2005 if (CS->getOperand(1)->isNullValue())
2006 break; // Found a null terminator, skip the rest.
2007 ConstantInt *Priority = dyn_cast<ConstantInt>(CS->getOperand(0));
2008 if (!Priority) continue; // Malformed.
2009 Structors.push_back(Structor());
2010 Structor &S = Structors.back();
2011 S.Priority = Priority->getLimitedValue(65535);
2012 S.Func = CS->getOperand(1);
2013 if (!CS->getOperand(2)->isNullValue())
2014 S.ComdatKey =
2015 dyn_cast<GlobalValue>(CS->getOperand(2)->stripPointerCasts());
2016 }
2017
2018 // Emit the function pointers in the target-specific order
2019 llvm::stable_sort(Structors, [](const Structor &L, const Structor &R) {
2020 return L.Priority < R.Priority;
2021 });
2022 const Align Align = DL.getPointerPrefAlignment();
2023 for (Structor &S : Structors) {
2024 const TargetLoweringObjectFile &Obj = getObjFileLowering();
2025 const MCSymbol *KeySym = nullptr;
2026 if (GlobalValue *GV = S.ComdatKey) {
2027 if (GV->isDeclarationForLinker())
2028 // If the associated variable is not defined in this module
2029 // (it might be available_externally, or have been an
2030 // available_externally definition that was dropped by the
2031 // EliminateAvailableExternally pass), some other TU
2032 // will provide its dynamic initializer.
2033 continue;
2034
2035 KeySym = getSymbol(GV);
2036 }
2037 MCSection *OutputSection =
2038 (isCtor ? Obj.getStaticCtorSection(S.Priority, KeySym)
2039 : Obj.getStaticDtorSection(S.Priority, KeySym));
2040 OutStreamer->SwitchSection(OutputSection);
2041 if (OutStreamer->getCurrentSection() != OutStreamer->getPreviousSection())
2042 EmitAlignment(Align);
2043 EmitXXStructor(DL, S.Func);
2044 }
2045}
2046
2047void AsmPrinter::EmitModuleIdents(Module &M) {
2048 if (!MAI->hasIdentDirective())
2049 return;
2050
2051 if (const NamedMDNode *NMD = M.getNamedMetadata("llvm.ident")) {
2052 for (unsigned i = 0, e = NMD->getNumOperands(); i != e; ++i) {
2053 const MDNode *N = NMD->getOperand(i);
2054 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-10~+201911111502510600c19528f1809/llvm/lib/CodeGen/AsmPrinter/AsmPrinter.cpp"
, 2055, __PRETTY_FUNCTION__))
2055 "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-10~+201911111502510600c19528f1809/llvm/lib/CodeGen/AsmPrinter/AsmPrinter.cpp"
, 2055, __PRETTY_FUNCTION__))
;
2056 const MDString *S = cast<MDString>(N->getOperand(0));
2057 OutStreamer->EmitIdent(S->getString());
2058 }
2059 }
2060}
2061
2062void AsmPrinter::EmitModuleCommandLines(Module &M) {
2063 MCSection *CommandLine = getObjFileLowering().getSectionForCommandLines();
2064 if (!CommandLine)
2065 return;
2066
2067 const NamedMDNode *NMD = M.getNamedMetadata("llvm.commandline");
2068 if (!NMD || !NMD->getNumOperands())
2069 return;
2070
2071 OutStreamer->PushSection();
2072 OutStreamer->SwitchSection(CommandLine);
2073 OutStreamer->EmitZeros(1);
2074 for (unsigned i = 0, e = NMD->getNumOperands(); i != e; ++i) {
2075 const MDNode *N = NMD->getOperand(i);
2076 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-10~+201911111502510600c19528f1809/llvm/lib/CodeGen/AsmPrinter/AsmPrinter.cpp"
, 2077, __PRETTY_FUNCTION__))
2077 "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-10~+201911111502510600c19528f1809/llvm/lib/CodeGen/AsmPrinter/AsmPrinter.cpp"
, 2077, __PRETTY_FUNCTION__))
;
2078 const MDString *S = cast<MDString>(N->getOperand(0));
2079 OutStreamer->EmitBytes(S->getString());
2080 OutStreamer->EmitZeros(1);
2081 }
2082 OutStreamer->PopSection();
2083}
2084
2085//===--------------------------------------------------------------------===//
2086// Emission and print routines
2087//
2088
2089/// Emit a byte directive and value.
2090///
2091void AsmPrinter::emitInt8(int Value) const {
2092 OutStreamer->EmitIntValue(Value, 1);
2093}
2094
2095/// Emit a short directive and value.
2096void AsmPrinter::emitInt16(int Value) const {
2097 OutStreamer->EmitIntValue(Value, 2);
2098}
2099
2100/// Emit a long directive and value.
2101void AsmPrinter::emitInt32(int Value) const {
2102 OutStreamer->EmitIntValue(Value, 4);
2103}
2104
2105/// Emit a long long directive and value.
2106void AsmPrinter::emitInt64(uint64_t Value) const {
2107 OutStreamer->EmitIntValue(Value, 8);
2108}
2109
2110/// Emit something like ".long Hi-Lo" where the size in bytes of the directive
2111/// is specified by Size and Hi/Lo specify the labels. This implicitly uses
2112/// .set if it avoids relocations.
2113void AsmPrinter::EmitLabelDifference(const MCSymbol *Hi, const MCSymbol *Lo,
2114 unsigned Size) const {
2115 OutStreamer->emitAbsoluteSymbolDiff(Hi, Lo, Size);
2116}
2117
2118/// EmitLabelPlusOffset - Emit something like ".long Label+Offset"
2119/// where the size in bytes of the directive is specified by Size and Label
2120/// specifies the label. This implicitly uses .set if it is available.
2121void AsmPrinter::EmitLabelPlusOffset(const MCSymbol *Label, uint64_t Offset,
2122 unsigned Size,
2123 bool IsSectionRelative) const {
2124 if (MAI->needsDwarfSectionOffsetDirective() && IsSectionRelative) {
2125 OutStreamer->EmitCOFFSecRel32(Label, Offset);
2126 if (Size > 4)
2127 OutStreamer->EmitZeros(Size - 4);
2128 return;
2129 }
2130
2131 // Emit Label+Offset (or just Label if Offset is zero)
2132 const MCExpr *Expr = MCSymbolRefExpr::create(Label, OutContext);
2133 if (Offset)
2134 Expr = MCBinaryExpr::createAdd(
2135 Expr, MCConstantExpr::create(Offset, OutContext), OutContext);
2136
2137 OutStreamer->EmitValue(Expr, Size);
2138}
2139
2140//===----------------------------------------------------------------------===//
2141
2142// EmitAlignment - Emit an alignment directive to the specified power of
2143// two boundary. If a global value is specified, and if that global has
2144// an explicit alignment requested, it will override the alignment request
2145// if required for correctness.
2146void AsmPrinter::EmitAlignment(Align Alignment, const GlobalObject *GV) const {
2147 if (GV)
2148 Alignment = getGVAlignment(GV, GV->getParent()->getDataLayout(), Alignment);
2149
2150 if (Alignment == Align::None())
2151 return; // 1-byte aligned: no need to emit alignment.
2152
2153 if (getCurrentSection()->getKind().isText())
2154 OutStreamer->EmitCodeAlignment(Alignment.value());
2155 else
2156 OutStreamer->EmitValueToAlignment(Alignment.value());
2157}
2158
2159//===----------------------------------------------------------------------===//
2160// Constant emission.
2161//===----------------------------------------------------------------------===//
2162
2163const MCExpr *AsmPrinter::lowerConstant(const Constant *CV) {
2164 MCContext &Ctx = OutContext;
2165
2166 if (CV->isNullValue() || isa<UndefValue>(CV))
2167 return MCConstantExpr::create(0, Ctx);
2168
2169 if (const ConstantInt *CI = dyn_cast<ConstantInt>(CV))
2170 return MCConstantExpr::create(CI->getZExtValue(), Ctx);
2171
2172 if (const GlobalValue *GV = dyn_cast<GlobalValue>(CV))
2173 return MCSymbolRefExpr::create(getSymbol(GV), Ctx);
2174
2175 if (const BlockAddress *BA = dyn_cast<BlockAddress>(CV))
2176 return MCSymbolRefExpr::create(GetBlockAddressSymbol(BA), Ctx);
2177
2178 const ConstantExpr *CE = dyn_cast<ConstantExpr>(CV);
2179 if (!CE) {
2180 llvm_unreachable("Unknown constant value to lower!")::llvm::llvm_unreachable_internal("Unknown constant value to lower!"
, "/build/llvm-toolchain-snapshot-10~+201911111502510600c19528f1809/llvm/lib/CodeGen/AsmPrinter/AsmPrinter.cpp"
, 2180)
;
2181 }
2182
2183 switch (CE->getOpcode()) {
2184 default:
2185 // If the code isn't optimized, there may be outstanding folding
2186 // opportunities. Attempt to fold the expression using DataLayout as a
2187 // last resort before giving up.
2188 if (Constant *C = ConstantFoldConstant(CE, getDataLayout()))
2189 if (C != CE)
2190 return lowerConstant(C);
2191
2192 // Otherwise report the problem to the user.
2193 {
2194 std::string S;
2195 raw_string_ostream OS(S);
2196 OS << "Unsupported expression in static initializer: ";
2197 CE->printAsOperand(OS, /*PrintType=*/false,
2198 !MF ? nullptr : MF->getFunction().getParent());
2199 report_fatal_error(OS.str());
2200 }
2201 case Instruction::GetElementPtr: {
2202 // Generate a symbolic expression for the byte address
2203 APInt OffsetAI(getDataLayout().getPointerTypeSizeInBits(CE->getType()), 0);
2204 cast<GEPOperator>(CE)->accumulateConstantOffset(getDataLayout(), OffsetAI);
2205
2206 const MCExpr *Base = lowerConstant(CE->getOperand(0));
2207 if (!OffsetAI)
2208 return Base;
2209
2210 int64_t Offset = OffsetAI.getSExtValue();
2211 return MCBinaryExpr::createAdd(Base, MCConstantExpr::create(Offset, Ctx),
2212 Ctx);
2213 }
2214
2215 case Instruction::Trunc:
2216 // We emit the value and depend on the assembler to truncate the generated
2217 // expression properly. This is important for differences between
2218 // blockaddress labels. Since the two labels are in the same function, it
2219 // is reasonable to treat their delta as a 32-bit value.
2220 LLVM_FALLTHROUGH[[gnu::fallthrough]];
2221 case Instruction::BitCast:
2222 return lowerConstant(CE->getOperand(0));
2223
2224 case Instruction::IntToPtr: {
2225 const DataLayout &DL = getDataLayout();
2226
2227 // Handle casts to pointers by changing them into casts to the appropriate
2228 // integer type. This promotes constant folding and simplifies this code.
2229 Constant *Op = CE->getOperand(0);
2230 Op = ConstantExpr::getIntegerCast(Op, DL.getIntPtrType(CV->getType()),
2231 false/*ZExt*/);
2232 return lowerConstant(Op);
2233 }
2234
2235 case Instruction::PtrToInt: {
2236 const DataLayout &DL = getDataLayout();
2237
2238 // Support only foldable casts to/from pointers that can be eliminated by
2239 // changing the pointer to the appropriately sized integer type.
2240 Constant *Op = CE->getOperand(0);
2241 Type *Ty = CE->getType();
2242
2243 const MCExpr *OpExpr = lowerConstant(Op);
2244
2245 // We can emit the pointer value into this slot if the slot is an
2246 // integer slot equal to the size of the pointer.
2247 //
2248 // If the pointer is larger than the resultant integer, then
2249 // as with Trunc just depend on the assembler to truncate it.
2250 if (DL.getTypeAllocSize(Ty) <= DL.getTypeAllocSize(Op->getType()))
2251 return OpExpr;
2252
2253 // Otherwise the pointer is smaller than the resultant integer, mask off
2254 // the high bits so we are sure to get a proper truncation if the input is
2255 // a constant expr.
2256 unsigned InBits = DL.getTypeAllocSizeInBits(Op->getType());
2257 const MCExpr *MaskExpr = MCConstantExpr::create(~0ULL >> (64-InBits), Ctx);
2258 return MCBinaryExpr::createAnd(OpExpr, MaskExpr, Ctx);
2259 }
2260
2261 case Instruction::Sub: {
2262 GlobalValue *LHSGV;
2263 APInt LHSOffset;
2264 if (IsConstantOffsetFromGlobal(CE->getOperand(0), LHSGV, LHSOffset,
2265 getDataLayout())) {
2266 GlobalValue *RHSGV;
2267 APInt RHSOffset;
2268 if (IsConstantOffsetFromGlobal(CE->getOperand(1), RHSGV, RHSOffset,
2269 getDataLayout())) {
2270 const MCExpr *RelocExpr =
2271 getObjFileLowering().lowerRelativeReference(LHSGV, RHSGV, TM);
2272 if (!RelocExpr)
2273 RelocExpr = MCBinaryExpr::createSub(
2274 MCSymbolRefExpr::create(getSymbol(LHSGV), Ctx),
2275 MCSymbolRefExpr::create(getSymbol(RHSGV), Ctx), Ctx);
2276 int64_t Addend = (LHSOffset - RHSOffset).getSExtValue();
2277 if (Addend != 0)
2278 RelocExpr = MCBinaryExpr::createAdd(
2279 RelocExpr, MCConstantExpr::create(Addend, Ctx), Ctx);
2280 return RelocExpr;
2281 }
2282 }
2283 }
2284 // else fallthrough
2285 LLVM_FALLTHROUGH[[gnu::fallthrough]];
2286
2287 // The MC library also has a right-shift operator, but it isn't consistently
2288 // signed or unsigned between different targets.
2289 case Instruction::Add:
2290 case Instruction::Mul:
2291 case Instruction::SDiv:
2292 case Instruction::SRem:
2293 case Instruction::Shl:
2294 case Instruction::And:
2295 case Instruction::Or:
2296 case Instruction::Xor: {
2297 const MCExpr *LHS = lowerConstant(CE->getOperand(0));
2298 const MCExpr *RHS = lowerConstant(CE->getOperand(1));
2299 switch (CE->getOpcode()) {
2300 default: llvm_unreachable("Unknown binary operator constant cast expr")::llvm::llvm_unreachable_internal("Unknown binary operator constant cast expr"
, "/build/llvm-toolchain-snapshot-10~+201911111502510600c19528f1809/llvm/lib/CodeGen/AsmPrinter/AsmPrinter.cpp"
, 2300)
;
2301 case Instruction::Add: return MCBinaryExpr::createAdd(LHS, RHS, Ctx);
2302 case Instruction::Sub: return MCBinaryExpr::createSub(LHS, RHS, Ctx);
2303 case Instruction::Mul: return MCBinaryExpr::createMul(LHS, RHS, Ctx);
2304 case Instruction::SDiv: return MCBinaryExpr::createDiv(LHS, RHS, Ctx);
2305 case Instruction::SRem: return MCBinaryExpr::createMod(LHS, RHS, Ctx);
2306 case Instruction::Shl: return MCBinaryExpr::createShl(LHS, RHS, Ctx);
2307 case Instruction::And: return MCBinaryExpr::createAnd(LHS, RHS, Ctx);
2308 case Instruction::Or: return MCBinaryExpr::createOr (LHS, RHS, Ctx);
2309 case Instruction::Xor: return MCBinaryExpr::createXor(LHS, RHS, Ctx);
2310 }
2311 }
2312 }
2313}
2314
2315static void emitGlobalConstantImpl(const DataLayout &DL, const Constant *C,
2316 AsmPrinter &AP,
2317 const Constant *BaseCV = nullptr,
2318 uint64_t Offset = 0);
2319
2320static void emitGlobalConstantFP(const ConstantFP *CFP, AsmPrinter &AP);
2321static void emitGlobalConstantFP(APFloat APF, Type *ET, AsmPrinter &AP);
2322
2323/// isRepeatedByteSequence - Determine whether the given value is
2324/// composed of a repeated sequence of identical bytes and return the
2325/// byte value. If it is not a repeated sequence, return -1.
2326static int isRepeatedByteSequence(const ConstantDataSequential *V) {
2327 StringRef Data = V->getRawDataValues();
2328 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-10~+201911111502510600c19528f1809/llvm/lib/CodeGen/AsmPrinter/AsmPrinter.cpp"
, 2328, __PRETTY_FUNCTION__))
;
2329 char C = Data[0];
2330 for (unsigned i = 1, e = Data.size(); i != e; ++i)
2331 if (Data[i] != C) return -1;
2332 return static_cast<uint8_t>(C); // Ensure 255 is not returned as -1.
2333}
2334
2335/// isRepeatedByteSequence - Determine whether the given value is
2336/// composed of a repeated sequence of identical bytes and return the
2337/// byte value. If it is not a repeated sequence, return -1.
2338static int isRepeatedByteSequence(const Value *V, const DataLayout &DL) {
2339 if (const ConstantInt *CI = dyn_cast<ConstantInt>(V)) {
2340 uint64_t Size = DL.getTypeAllocSizeInBits(V->getType());
2341 assert(Size % 8 == 0)((Size % 8 == 0) ? static_cast<void> (0) : __assert_fail
("Size % 8 == 0", "/build/llvm-toolchain-snapshot-10~+201911111502510600c19528f1809/llvm/lib/CodeGen/AsmPrinter/AsmPrinter.cpp"
, 2341, __PRETTY_FUNCTION__))
;
2342
2343 // Extend the element to take zero padding into account.
2344 APInt Value = CI->getValue().zextOrSelf(Size);
2345 if (!Value.isSplat(8))
2346 return -1;
2347
2348 return Value.zextOrTrunc(8).getZExtValue();
2349 }
2350 if (const ConstantArray *CA = dyn_cast<ConstantArray>(V)) {
2351 // Make sure all array elements are sequences of the same repeated
2352 // byte.
2353 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-10~+201911111502510600c19528f1809/llvm/lib/CodeGen/AsmPrinter/AsmPrinter.cpp"
, 2353, __PRETTY_FUNCTION__))
;
2354 Constant *Op0 = CA->getOperand(0);
2355 int Byte = isRepeatedByteSequence(Op0, DL);
2356 if (Byte == -1)
2357 return -1;
2358
2359 // All array elements must be equal.
2360 for (unsigned i = 1, e = CA->getNumOperands(); i != e; ++i)
2361 if (CA->getOperand(i) != Op0)
2362 return -1;
2363 return Byte;
2364 }
2365
2366 if (const ConstantDataSequential *CDS = dyn_cast<ConstantDataSequential>(V))
2367 return isRepeatedByteSequence(CDS);
2368
2369 return -1;
2370}
2371
2372static void emitGlobalConstantDataSequential(const DataLayout &DL,
2373 const ConstantDataSequential *CDS,
2374 AsmPrinter &AP) {
2375 // See if we can aggregate this into a .fill, if so, emit it as such.
2376 int Value = isRepeatedByteSequence(CDS, DL);
2377 if (Value != -1) {
2378 uint64_t Bytes = DL.getTypeAllocSize(CDS->getType());
2379 // Don't emit a 1-byte object as a .fill.
2380 if (Bytes > 1)
2381 return AP.OutStreamer->emitFill(Bytes, Value);
2382 }
2383
2384 // If this can be emitted with .ascii/.asciz, emit it as such.
2385 if (CDS->isString())
2386 return AP.OutStreamer->EmitBytes(CDS->getAsString());
2387
2388 // Otherwise, emit the values in successive locations.
2389 unsigned ElementByteSize = CDS->getElementByteSize();
2390 if (isa<IntegerType>(CDS->getElementType())) {
2391 for (unsigned i = 0, e = CDS->getNumElements(); i != e; ++i) {
2392 if (AP.isVerbose())
2393 AP.OutStreamer->GetCommentOS() << format("0x%" PRIx64"l" "x" "\n",
2394 CDS->getElementAsInteger(i));
2395 AP.OutStreamer->EmitIntValue(CDS->getElementAsInteger(i),
2396 ElementByteSize);
2397 }
2398 } else {
2399 Type *ET = CDS->getElementType();
2400 for (unsigned I = 0, E = CDS->getNumElements(); I != E; ++I)
2401 emitGlobalConstantFP(CDS->getElementAsAPFloat(I), ET, AP);
2402 }
2403
2404 unsigned Size = DL.getTypeAllocSize(CDS->getType());
2405 unsigned EmittedSize = DL.getTypeAllocSize(CDS->getType()->getElementType()) *
2406 CDS->getNumElements();
2407 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-10~+201911111502510600c19528f1809/llvm/lib/CodeGen/AsmPrinter/AsmPrinter.cpp"
, 2407, __PRETTY_FUNCTION__))
;
2408 if (unsigned Padding = Size - EmittedSize)
2409 AP.OutStreamer->EmitZeros(Padding);
2410}
2411
2412static void emitGlobalConstantArray(const DataLayout &DL,
2413 const ConstantArray *CA, AsmPrinter &AP,
2414 const Constant *BaseCV, uint64_t Offset) {
2415 // See if we can aggregate some values. Make sure it can be
2416 // represented as a series of bytes of the constant value.
2417 int Value = isRepeatedByteSequence(CA, DL);
2418
2419 if (Value != -1) {
2420 uint64_t Bytes = DL.getTypeAllocSize(CA->getType());
2421 AP.OutStreamer->emitFill(Bytes, Value);
2422 }
2423 else {
2424 for (unsigned i = 0, e = CA->getNumOperands(); i != e; ++i) {
2425 emitGlobalConstantImpl(DL, CA->getOperand(i), AP, BaseCV, Offset);
2426 Offset += DL.getTypeAllocSize(CA->getOperand(i)->getType());
2427 }
2428 }
2429}
2430
2431static void emitGlobalConstantVector(const DataLayout &DL,
2432 const ConstantVector *CV, AsmPrinter &AP) {
2433 for (unsigned i = 0, e = CV->getType()->getNumElements(); i != e; ++i)
2434 emitGlobalConstantImpl(DL, CV->getOperand(i), AP);
2435
2436 unsigned Size = DL.getTypeAllocSize(CV->getType());
2437 unsigned EmittedSize = DL.getTypeAllocSize(CV->getType()->getElementType()) *
2438 CV->getType()->getNumElements();
2439 if (unsigned Padding = Size - EmittedSize)
2440 AP.OutStreamer->EmitZeros(Padding);
2441}
2442
2443static void emitGlobalConstantStruct(const DataLayout &DL,
2444 const ConstantStruct *CS, AsmPrinter &AP,
2445 const Constant *BaseCV, uint64_t Offset) {
2446 // Print the fields in successive locations. Pad to align if needed!
2447 unsigned Size = DL.getTypeAllocSize(CS->getType());
2448 const StructLayout *Layout = DL.getStructLayout(CS->getType());
2449 uint64_t SizeSoFar = 0;
2450 for (unsigned i = 0, e = CS->getNumOperands(); i != e; ++i) {
2451 const Constant *Field = CS->getOperand(i);
2452
2453 // Print the actual field value.
2454 emitGlobalConstantImpl(DL, Field, AP, BaseCV, Offset + SizeSoFar);
2455
2456 // Check if padding is needed and insert one or more 0s.
2457 uint64_t FieldSize = DL.getTypeAllocSize(Field->getType());
2458 uint64_t PadSize = ((i == e-1 ? Size : Layout->getElementOffset(i+1))
2459 - Layout->getElementOffset(i)) - FieldSize;
2460 SizeSoFar += FieldSize + PadSize;
2461
2462 // Insert padding - this may include padding to increase the size of the
2463 // current field up to the ABI size (if the struct is not packed) as well
2464 // as padding to ensure that the next field starts at the right offset.
2465 AP.OutStreamer->EmitZeros(PadSize);
2466 }
2467 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-10~+201911111502510600c19528f1809/llvm/lib/CodeGen/AsmPrinter/AsmPrinter.cpp"
, 2468, __PRETTY_FUNCTION__))
2468 "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-10~+201911111502510600c19528f1809/llvm/lib/CodeGen/AsmPrinter/AsmPrinter.cpp"
, 2468, __PRETTY_FUNCTION__))
;
2469}
2470
2471static void emitGlobalConstantFP(APFloat APF, Type *ET, AsmPrinter &AP) {
2472 assert(ET && "Unknown float type")((ET && "Unknown float type") ? static_cast<void>
(0) : __assert_fail ("ET && \"Unknown float type\"",
"/build/llvm-toolchain-snapshot-10~+201911111502510600c19528f1809/llvm/lib/CodeGen/AsmPrinter/AsmPrinter.cpp"
, 2472, __PRETTY_FUNCTION__))
;
2473 APInt API = APF.bitcastToAPInt();
2474
2475 // First print a comment with what we think the original floating-point value
2476 // should have been.
2477 if (AP.isVerbose()) {
2478 SmallString<8> StrVal;
2479 APF.toString(StrVal);
2480 ET->print(AP.OutStreamer->GetCommentOS());
2481 AP.OutStreamer->GetCommentOS() << ' ' << StrVal << '\n';
2482 }
2483
2484 // Now iterate through the APInt chunks, emitting them in endian-correct
2485 // order, possibly with a smaller chunk at beginning/end (e.g. for x87 80-bit
2486 // floats).
2487 unsigned NumBytes = API.getBitWidth() / 8;
2488 unsigned TrailingBytes = NumBytes % sizeof(uint64_t);
2489 const uint64_t *p = API.getRawData();
2490
2491 // PPC's long double has odd notions of endianness compared to how LLVM
2492 // handles it: p[0] goes first for *big* endian on PPC.
2493 if (AP.getDataLayout().isBigEndian() && !ET->isPPC_FP128Ty()) {
2494 int Chunk = API.getNumWords() - 1;
2495
2496 if (TrailingBytes)
2497 AP.OutStreamer->EmitIntValue(p[Chunk--], TrailingBytes);
2498
2499 for (; Chunk >= 0; --Chunk)
2500 AP.OutStreamer->EmitIntValue(p[Chunk], sizeof(uint64_t));
2501 } else {
2502 unsigned Chunk;
2503 for (Chunk = 0; Chunk < NumBytes / sizeof(uint64_t); ++Chunk)
2504 AP.OutStreamer->EmitIntValue(p[Chunk], sizeof(uint64_t));
2505
2506 if (TrailingBytes)
2507 AP.OutStreamer->EmitIntValue(p[Chunk], TrailingBytes);
2508 }
2509
2510 // Emit the tail padding for the long double.
2511 const DataLayout &DL = AP.getDataLayout();
2512 AP.OutStreamer->EmitZeros(DL.getTypeAllocSize(ET) - DL.getTypeStoreSize(ET));
2513}
2514
2515static void emitGlobalConstantFP(const ConstantFP *CFP, AsmPrinter &AP) {
2516 emitGlobalConstantFP(CFP->getValueAPF(), CFP->getType(), AP);
2517}
2518
2519static void emitGlobalConstantLargeInt(const ConstantInt *CI, AsmPrinter &AP) {
2520 const DataLayout &DL = AP.getDataLayout();
2521 unsigned BitWidth = CI->getBitWidth();
2522
2523 // Copy the value as we may massage the layout for constants whose bit width
2524 // is not a multiple of 64-bits.
2525 APInt Realigned(CI->getValue());
2526 uint64_t ExtraBits = 0;
2527 unsigned ExtraBitsSize = BitWidth & 63;
2528
2529 if (ExtraBitsSize) {
2530 // The bit width of the data is not a multiple of 64-bits.
2531 // The extra bits are expected to be at the end of the chunk of the memory.
2532 // Little endian:
2533 // * Nothing to be done, just record the extra bits to emit.
2534 // Big endian:
2535 // * Record the extra bits to emit.
2536 // * Realign the raw data to emit the chunks of 64-bits.
2537 if (DL.isBigEndian()) {
2538 // Basically the structure of the raw data is a chunk of 64-bits cells:
2539 // 0 1 BitWidth / 64
2540 // [chunk1][chunk2] ... [chunkN].
2541 // The most significant chunk is chunkN and it should be emitted first.
2542 // However, due to the alignment issue chunkN contains useless bits.
2543 // Realign the chunks so that they contain only useless information:
2544 // ExtraBits 0 1 (BitWidth / 64) - 1
2545 // chu[nk1 chu][nk2 chu] ... [nkN-1 chunkN]
2546 ExtraBits = Realigned.getRawData()[0] &
2547 (((uint64_t)-1) >> (64 - ExtraBitsSize));
2548 Realigned.lshrInPlace(ExtraBitsSize);
2549 } else
2550 ExtraBits = Realigned.getRawData()[BitWidth / 64];
2551 }
2552
2553 // We don't expect assemblers to support integer data directives
2554 // for more than 64 bits, so we emit the data in at most 64-bit
2555 // quantities at a time.
2556 const uint64_t *RawData = Realigned.getRawData();
2557 for (unsigned i = 0, e = BitWidth / 64; i != e; ++i) {
2558 uint64_t Val = DL.isBigEndian() ? RawData[e - i - 1] : RawData[i];
2559 AP.OutStreamer->EmitIntValue(Val, 8);
2560 }
2561
2562 if (ExtraBitsSize) {
2563 // Emit the extra bits after the 64-bits chunks.
2564
2565 // Emit a directive that fills the expected size.
2566 uint64_t Size = AP.getDataLayout().getTypeAllocSize(CI->getType());
2567 Size -= (BitWidth / 64) * 8;
2568 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-10~+201911111502510600c19528f1809/llvm/lib/CodeGen/AsmPrinter/AsmPrinter.cpp"
, 2570, __PRETTY_FUNCTION__))
2569 (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-10~+201911111502510600c19528f1809/llvm/lib/CodeGen/AsmPrinter/AsmPrinter.cpp"
, 2570, __PRETTY_FUNCTION__))
2570 == 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-10~+201911111502510600c19528f1809/llvm/lib/CodeGen/AsmPrinter/AsmPrinter.cpp"
, 2570, __PRETTY_FUNCTION__))
;
2571 AP.OutStreamer->EmitIntValue(ExtraBits, Size);
2572 }
2573}
2574
2575/// Transform a not absolute MCExpr containing a reference to a GOT
2576/// equivalent global, by a target specific GOT pc relative access to the
2577/// final symbol.
2578static void handleIndirectSymViaGOTPCRel(AsmPrinter &AP, const MCExpr **ME,
2579 const Constant *BaseCst,
2580 uint64_t Offset) {
2581 // The global @foo below illustrates a global that uses a got equivalent.
2582 //
2583 // @bar = global i32 42
2584 // @gotequiv = private unnamed_addr constant i32* @bar
2585 // @foo = i32 trunc (i64 sub (i64 ptrtoint (i32** @gotequiv to i64),
2586 // i64 ptrtoint (i32* @foo to i64))
2587 // to i32)
2588 //
2589 // The cstexpr in @foo is converted into the MCExpr `ME`, where we actually
2590 // check whether @foo is suitable to use a GOTPCREL. `ME` is usually in the
2591 // form:
2592 //
2593 // foo = cstexpr, where
2594 // cstexpr := <gotequiv> - "." + <cst>
2595 // cstexpr := <gotequiv> - (<foo> - <offset from @foo base>) + <cst>
2596 //
2597 // After canonicalization by evaluateAsRelocatable `ME` turns into:
2598 //
2599 // cstexpr := <gotequiv> - <foo> + gotpcrelcst, where
2600 // gotpcrelcst := <offset from @foo base> + <cst>
2601 MCValue MV;
2602 if (!(*ME)->evaluateAsRelocatable(MV, nullptr, nullptr) || MV.isAbsolute())
2603 return;
2604 const MCSymbolRefExpr *SymA = MV.getSymA();
2605 if (!SymA)
2606 return;
2607
2608 // Check that GOT equivalent symbol is cached.
2609 const MCSymbol *GOTEquivSym = &SymA->getSymbol();
2610 if (!AP.GlobalGOTEquivs.count(GOTEquivSym))
2611 return;
2612
2613 const GlobalValue *BaseGV = dyn_cast_or_null<GlobalValue>(BaseCst);
2614 if (!BaseGV)
2615 return;
2616
2617 // Check for a valid base symbol
2618 const MCSymbol *BaseSym = AP.getSymbol(BaseGV);
2619 const MCSymbolRefExpr *SymB = MV.getSymB();
2620
2621 if (!SymB || BaseSym != &SymB->getSymbol())
2622 return;
2623
2624 // Make sure to match:
2625 //
2626 // gotpcrelcst := <offset from @foo base> + <cst>
2627 //
2628 // If gotpcrelcst is positive it means that we can safely fold the pc rel
2629 // displacement into the GOTPCREL. We can also can have an extra offset <cst>
2630 // if the target knows how to encode it.
2631 int64_t GOTPCRelCst = Offset + MV.getConstant();
2632 if (GOTPCRelCst < 0)
2633 return;
2634 if (!AP.getObjFileLowering().supportGOTPCRelWithOffset() && GOTPCRelCst != 0)
2635 return;
2636
2637 // Emit the GOT PC relative to replace the got equivalent global, i.e.:
2638 //
2639 // bar:
2640 // .long 42
2641 // gotequiv:
2642 // .quad bar
2643 // foo:
2644 // .long gotequiv - "." + <cst>
2645 //
2646 // is replaced by the target specific equivalent to:
2647 //
2648 // bar:
2649 // .long 42
2650 // foo:
2651 // .long bar@GOTPCREL+<gotpcrelcst>
2652 AsmPrinter::GOTEquivUsePair Result = AP.GlobalGOTEquivs[GOTEquivSym];
2653 const GlobalVariable *GV = Result.first;
2654 int NumUses = (int)Result.second;
2655 const GlobalValue *FinalGV = dyn_cast<GlobalValue>(GV->getOperand(0));
2656 const MCSymbol *FinalSym = AP.getSymbol(FinalGV);
2657 *ME = AP.getObjFileLowering().getIndirectSymViaGOTPCRel(
2658 FinalGV, FinalSym, MV, Offset, AP.MMI, *AP.OutStreamer);
2659
2660 // Update GOT equivalent usage information
2661 --NumUses;
2662 if (NumUses >= 0)
2663 AP.GlobalGOTEquivs[GOTEquivSym] = std::make_pair(GV, NumUses);
2664}
2665
2666static void emitGlobalConstantImpl(const DataLayout &DL, const Constant *CV,
2667 AsmPrinter &AP, const Constant *BaseCV,
2668 uint64_t Offset) {
2669 uint64_t Size = DL.getTypeAllocSize(CV->getType());
2670
2671 // Globals with sub-elements such as combinations of arrays and structs
2672 // are handled recursively by emitGlobalConstantImpl. Keep track of the
2673 // constant symbol base and the current position with BaseCV and Offset.
2674 if (!BaseCV && CV->hasOneUse())
2675 BaseCV = dyn_cast<Constant>(CV->user_back());
2676
2677 if (isa<ConstantAggregateZero>(CV) || isa<UndefValue>(CV))
2678 return AP.OutStreamer->EmitZeros(Size);
2679
2680 if (const ConstantInt *CI = dyn_cast<ConstantInt>(CV)) {
2681 switch (Size) {
2682 case 1:
2683 case 2:
2684 case 4:
2685 case 8:
2686 if (AP.isVerbose())
2687 AP.OutStreamer->GetCommentOS() << format("0x%" PRIx64"l" "x" "\n",
2688 CI->getZExtValue());
2689 AP.OutStreamer->EmitIntValue(CI->getZExtValue(), Size);
2690 return;
2691 default:
2692 emitGlobalConstantLargeInt(CI, AP);
2693 return;
2694 }
2695 }
2696
2697 if (const ConstantFP *CFP = dyn_cast<ConstantFP>(CV))
2698 return emitGlobalConstantFP(CFP, AP);
2699
2700 if (isa<ConstantPointerNull>(CV)) {
2701 AP.OutStreamer->EmitIntValue(0, Size);
2702 return;
2703 }
2704
2705 if (const ConstantDataSequential *CDS = dyn_cast<ConstantDataSequential>(CV))
2706 return emitGlobalConstantDataSequential(DL, CDS, AP);
2707
2708 if (const ConstantArray *CVA = dyn_cast<ConstantArray>(CV))
2709 return emitGlobalConstantArray(DL, CVA, AP, BaseCV, Offset);
2710
2711 if (const ConstantStruct *CVS = dyn_cast<ConstantStruct>(CV))
2712 return emitGlobalConstantStruct(DL, CVS, AP, BaseCV, Offset);
2713
2714 if (const ConstantExpr *CE = dyn_cast<ConstantExpr>(CV)) {
2715 // Look through bitcasts, which might not be able to be MCExpr'ized (e.g. of
2716 // vectors).
2717 if (CE->getOpcode() == Instruction::BitCast)
2718 return emitGlobalConstantImpl(DL, CE->getOperand(0), AP);
2719
2720 if (Size > 8) {
2721 // If the constant expression's size is greater than 64-bits, then we have
2722 // to emit the value in chunks. Try to constant fold the value and emit it
2723 // that way.
2724 Constant *New = ConstantFoldConstant(CE, DL);
2725 if (New && New != CE)
2726 return emitGlobalConstantImpl(DL, New, AP);
2727 }
2728 }
2729
2730 if (const ConstantVector *V = dyn_cast<ConstantVector>(CV))
2731 return emitGlobalConstantVector(DL, V, AP);
2732
2733 // Otherwise, it must be a ConstantExpr. Lower it to an MCExpr, then emit it
2734 // thread the streamer with EmitValue.
2735 const MCExpr *ME = AP.lowerConstant(CV);
2736
2737 // Since lowerConstant already folded and got rid of all IR pointer and
2738 // integer casts, detect GOT equivalent accesses by looking into the MCExpr
2739 // directly.
2740 if (AP.getObjFileLowering().supportIndirectSymViaGOTPCRel())
2741 handleIndirectSymViaGOTPCRel(AP, &ME, BaseCV, Offset);
2742
2743 AP.OutStreamer->EmitValue(ME, Size);
2744}
2745
2746/// EmitGlobalConstant - Print a general LLVM constant to the .s file.
2747void AsmPrinter::EmitGlobalConstant(const DataLayout &DL, const Constant *CV) {
2748 uint64_t Size = DL.getTypeAllocSize(CV->getType());
2749 if (Size)
2750 emitGlobalConstantImpl(DL, CV, *this);
2751 else if (MAI->hasSubsectionsViaSymbols()) {
2752 // If the global has zero size, emit a single byte so that two labels don't
2753 // look like they are at the same location.
2754 OutStreamer->EmitIntValue(0, 1);
2755 }
2756}
2757
2758void AsmPrinter::EmitMachineConstantPoolValue(MachineConstantPoolValue *MCPV) {
2759 // Target doesn't support this yet!
2760 llvm_unreachable("Target does not support EmitMachineConstantPoolValue")::llvm::llvm_unreachable_internal("Target does not support EmitMachineConstantPoolValue"
, "/build/llvm-toolchain-snapshot-10~+201911111502510600c19528f1809/llvm/lib/CodeGen/AsmPrinter/AsmPrinter.cpp"
, 2760)
;
2761}
2762
2763void AsmPrinter::printOffset(int64_t Offset, raw_ostream &OS) const {
2764 if (Offset > 0)
2765 OS << '+' << Offset;
2766 else if (Offset < 0)
2767 OS << Offset;
2768}
2769
2770//===----------------------------------------------------------------------===//
2771// Symbol Lowering Routines.
2772//===----------------------------------------------------------------------===//
2773
2774MCSymbol *AsmPrinter::createTempSymbol(const Twine &Name) const {
2775 return OutContext.createTempSymbol(Name, true);
2776}
2777
2778MCSymbol *AsmPrinter::GetBlockAddressSymbol(const BlockAddress *BA) const {
2779 return MMI->getAddrLabelSymbol(BA->getBasicBlock());
2780}
2781
2782MCSymbol *AsmPrinter::GetBlockAddressSymbol(const BasicBlock *BB) const {
2783 return MMI->getAddrLabelSymbol(BB);
2784}
2785
2786/// GetCPISymbol - Return the symbol for the specified constant pool entry.
2787MCSymbol *AsmPrinter::GetCPISymbol(unsigned CPID) const {
2788 if (getSubtargetInfo().getTargetTriple().isWindowsMSVCEnvironment()) {
2789 const MachineConstantPoolEntry &CPE =
2790 MF->getConstantPool()->getConstants()[CPID];
2791 if (!CPE.isMachineConstantPoolEntry()) {
2792 const DataLayout &DL = MF->getDataLayout();
2793 SectionKind Kind = CPE.getSectionKind(&DL);
2794 const Constant *C = CPE.Val.ConstVal;
2795 unsigned Align = CPE.Alignment;
2796 if (const MCSectionCOFF *S = dyn_cast<MCSectionCOFF>(
2797 getObjFileLowering().getSectionForConstant(DL, Kind, C, Align))) {
2798 if (MCSymbol *Sym = S->getCOMDATSymbol()) {
2799 if (Sym->isUndefined())
2800 OutStreamer->EmitSymbolAttribute(Sym, MCSA_Global);
2801 return Sym;
2802 }
2803 }
2804 }
2805 }
2806
2807 const DataLayout &DL = getDataLayout();
2808 return OutContext.getOrCreateSymbol(Twine(DL.getPrivateGlobalPrefix()) +
2809 "CPI" + Twine(getFunctionNumber()) + "_" +
2810 Twine(CPID));
2811}
2812
2813/// GetJTISymbol - Return the symbol for the specified jump table entry.
2814MCSymbol *AsmPrinter::GetJTISymbol(unsigned JTID, bool isLinkerPrivate) const {
2815 return MF->getJTISymbol(JTID, OutContext, isLinkerPrivate);
2816}
2817
2818/// GetJTSetSymbol - Return the symbol for the specified jump table .set
2819/// FIXME: privatize to AsmPrinter.
2820MCSymbol *AsmPrinter::GetJTSetSymbol(unsigned UID, unsigned MBBID) const {
2821 const DataLayout &DL = getDataLayout();
2822 return OutContext.getOrCreateSymbol(Twine(DL.getPrivateGlobalPrefix()) +
2823 Twine(getFunctionNumber()) + "_" +
2824 Twine(UID) + "_set_" + Twine(MBBID));
2825}
2826
2827MCSymbol *AsmPrinter::getSymbolWithGlobalValueBase(const GlobalValue *GV,
2828 StringRef Suffix) const {
2829 return getObjFileLowering().getSymbolWithGlobalValueBase(GV, Suffix, TM);
2830}
2831
2832/// Return the MCSymbol for the specified ExternalSymbol.
2833MCSymbol *AsmPrinter::GetExternalSymbolSymbol(StringRef Sym) const {
2834 SmallString<60> NameStr;
2835 Mangler::getNameWithPrefix(NameStr, Sym, getDataLayout());
2836 return OutContext.getOrCreateSymbol(NameStr);
2837}
2838
2839/// PrintParentLoopComment - Print comments about parent loops of this one.
2840static void PrintParentLoopComment(raw_ostream &OS, const MachineLoop *Loop,
2841 unsigned FunctionNumber) {
2842 if (!Loop) return;
2843 PrintParentLoopComment(OS, Loop->getParentLoop(), FunctionNumber);
2844 OS.indent(Loop->getLoopDepth()*2)
2845 << "Parent Loop BB" << FunctionNumber << "_"
2846 << Loop->getHeader()->getNumber()
2847 << " Depth=" << Loop->getLoopDepth() << '\n';
2848}
2849
2850/// PrintChildLoopComment - Print comments about child loops within
2851/// the loop for this basic block, with nesting.
2852static void PrintChildLoopComment(raw_ostream &OS, const MachineLoop *Loop,
2853 unsigned FunctionNumber) {
2854 // Add child loop information
2855 for (const MachineLoop *CL : *Loop) {
2856 OS.indent(CL->getLoopDepth()*2)
2857 << "Child Loop BB" << FunctionNumber << "_"
2858 << CL->getHeader()->getNumber() << " Depth " << CL->getLoopDepth()
2859 << '\n';
2860 PrintChildLoopComment(OS, CL, FunctionNumber);
2861 }
2862}
2863
2864/// emitBasicBlockLoopComments - Pretty-print comments for basic blocks.
2865static void emitBasicBlockLoopComments(const MachineBasicBlock &MBB,
2866 const MachineLoopInfo *LI,
2867 const AsmPrinter &AP) {
2868 // Add loop depth information
2869 const MachineLoop *Loop = LI->getLoopFor(&MBB);
2870 if (!Loop) return;
2871
2872 MachineBasicBlock *Header = Loop->getHeader();
2873 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-10~+201911111502510600c19528f1809/llvm/lib/CodeGen/AsmPrinter/AsmPrinter.cpp"
, 2873, __PRETTY_FUNCTION__))
;
2874
2875 // If this block is not a loop header, just print out what is the loop header
2876 // and return.
2877 if (Header != &MBB) {
2878 AP.OutStreamer->AddComment(" in Loop: Header=BB" +
2879 Twine(AP.getFunctionNumber())+"_" +
2880 Twine(Loop->getHeader()->getNumber())+
2881 " Depth="+Twine(Loop->getLoopDepth()));
2882 return;
2883 }
2884
2885 // Otherwise, it is a loop header. Print out information about child and
2886 // parent loops.
2887 raw_ostream &OS = AP.OutStreamer->GetCommentOS();
2888
2889 PrintParentLoopComment(OS, Loop->getParentLoop(), AP.getFunctionNumber());
2890
2891 OS << "=>";
2892 OS.indent(Loop->getLoopDepth()*2-2);
2893
2894 OS << "This ";
2895 if (Loop->empty())
2896 OS << "Inner ";
2897 OS << "Loop Header: Depth=" + Twine(Loop->getLoopDepth()) << '\n';
2898
2899 PrintChildLoopComment(OS, Loop, AP.getFunctionNumber());
2900}
2901
2902void AsmPrinter::setupCodePaddingContext(const MachineBasicBlock &MBB,
2903 MCCodePaddingContext &Context) const {
2904 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-10~+201911111502510600c19528f1809/llvm/lib/CodeGen/AsmPrinter/AsmPrinter.cpp"
, 2904, __PRETTY_FUNCTION__))
;
2905 Context.IsPaddingActive = !MF->hasInlineAsm() &&
2906 !MF->getFunction().hasOptSize() &&
2907 TM.getOptLevel() != CodeGenOpt::None;
2908 Context.IsBasicBlockReachableViaFallthrough =
2909 std::find(MBB.pred_begin(), MBB.pred_end(), MBB.getPrevNode()) !=
2910 MBB.pred_end();
2911 Context.IsBasicBlockReachableViaBranch =
2912 MBB.pred_size() > 0 && !isBlockOnlyReachableByFallthrough(&MBB);
2913}
2914
2915/// EmitBasicBlockStart - This method prints the label for the specified
2916/// MachineBasicBlock, an alignment (if present) and a comment describing
2917/// it if appropriate.
2918void AsmPrinter::EmitBasicBlockStart(const MachineBasicBlock &MBB) {
2919 // End the previous funclet and start a new one.
2920 if (MBB.isEHFuncletEntry()) {
2921 for (const HandlerInfo &HI : Handlers) {
2922 HI.Handler->endFunclet();
2923 HI.Handler->beginFunclet(MBB);
2924 }
2925 }
2926
2927 // Emit an alignment directive for this block, if needed.
2928 const Align Alignment = MBB.getAlignment();
2929 if (Alignment != Align::None())
2930 EmitAlignment(Alignment);
2931 MCCodePaddingContext Context;
2932 setupCodePaddingContext(MBB, Context);
2933 OutStreamer->EmitCodePaddingBasicBlockStart(Context);
2934
2935 // If the block has its address taken, emit any labels that were used to
2936 // reference the block. It is possible that there is more than one label
2937 // here, because multiple LLVM BB's may have been RAUW'd to this block after
2938 // the references were generated.
2939 if (MBB.hasAddressTaken()) {
2940 const BasicBlock *BB = MBB.getBasicBlock();
2941 if (isVerbose())
2942 OutStreamer->AddComment("Block address taken");
2943
2944 // MBBs can have their address taken as part of CodeGen without having
2945 // their corresponding BB's address taken in IR
2946 if (BB->hasAddressTaken())
2947 for (MCSymbol *Sym : MMI->getAddrLabelSymbolToEmit(BB))
2948 OutStreamer->EmitLabel(Sym);
2949 }
2950
2951 // Print some verbose block comments.
2952 if (isVerbose()) {
2953 if (const BasicBlock *BB = MBB.getBasicBlock()) {
2954 if (BB->hasName()) {
2955 BB->printAsOperand(OutStreamer->GetCommentOS(),
2956 /*PrintType=*/false, BB->getModule());
2957 OutStreamer->GetCommentOS() << '\n';
2958 }
2959 }
2960
2961 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-10~+201911111502510600c19528f1809/llvm/lib/CodeGen/AsmPrinter/AsmPrinter.cpp"
, 2961, __PRETTY_FUNCTION__))
;
2962 emitBasicBlockLoopComments(MBB, MLI, *this);
2963 }
2964
2965 // Print the main label for the block.
2966 if (MBB.pred_empty() ||
2967 (isBlockOnlyReachableByFallthrough(&MBB) && !MBB.isEHFuncletEntry() &&
2968 !MBB.hasLabelMustBeEmitted())) {
2969 if (isVerbose()) {
2970 // NOTE: Want this comment at start of line, don't emit with AddComment.
2971 OutStreamer->emitRawComment(" %bb." + Twine(MBB.getNumber()) + ":",
2972 false);
2973 }
2974 } else {
2975 if (isVerbose() && MBB.hasLabelMustBeEmitted())
2976 OutStreamer->AddComment("Label of block must be emitted");
2977 OutStreamer->EmitLabel(MBB.getSymbol());
2978 }
2979}
2980
2981void AsmPrinter::EmitBasicBlockEnd(const MachineBasicBlock &MBB) {
2982 MCCodePaddingContext Context;
2983 setupCodePaddingContext(MBB, Context);
2984 OutStreamer->EmitCodePaddingBasicBlockEnd(Context);
2985}
2986
2987void AsmPrinter::EmitVisibility(MCSymbol *Sym, unsigned Visibility,
2988 bool IsDefinition) const {
2989 MCSymbolAttr Attr = MCSA_Invalid;
2990
2991 switch (Visibility) {
2992 default: break;
2993 case GlobalValue::HiddenVisibility:
2994 if (IsDefinition)
2995 Attr = MAI->getHiddenVisibilityAttr();
2996 else
2997 Attr = MAI->getHiddenDeclarationVisibilityAttr();
2998 break;
2999 case GlobalValue::ProtectedVisibility:
3000 Attr = MAI->getProtectedVisibilityAttr();
3001 break;
3002 }
3003
3004 if (Attr != MCSA_Invalid)
3005 OutStreamer->EmitSymbolAttribute(Sym, Attr);
3006}
3007
3008/// isBlockOnlyReachableByFallthough - Return true if the basic block has
3009/// exactly one predecessor and the control transfer mechanism between
3010/// the predecessor and this block is a fall-through.
3011bool AsmPrinter::
3012isBlockOnlyReachableByFallthrough(const MachineBasicBlock *MBB) const {
3013 // If this is a landing pad, it isn't a fall through. If it has no preds,
3014 // then nothing falls through to it.
3015 if (MBB->isEHPad() || MBB->pred_empty())
3016 return false;
3017
3018 // If there isn't exactly one predecessor, it can't be a fall through.
3019 if (MBB->pred_size() > 1)
3020 return false;
3021
3022 // The predecessor has to be immediately before this block.
3023 MachineBasicBlock *Pred = *MBB->pred_begin();
3024 if (!Pred->isLayoutSuccessor(MBB))
3025 return false;
3026
3027 // If the block is completely empty, then it definitely does fall through.
3028 if (Pred->empty())
3029 return true;
3030
3031 // Check the terminators in the previous blocks
3032 for (const auto &MI : Pred->terminators()) {
3033 // If it is not a simple branch, we are in a table somewhere.
3034 if (!MI.isBranch() || MI.isIndirectBranch())
3035 return false;
3036
3037 // If we are the operands of one of the branches, this is not a fall
3038 // through. Note that targets with delay slots will usually bundle
3039 // terminators with the delay slot instruction.
3040 for (ConstMIBundleOperands OP(MI); OP.isValid(); ++OP) {
3041 if (OP->isJTI())
3042 return false;
3043 if (OP->isMBB() && OP->getMBB() == MBB)
3044 return false;
3045 }
3046 }
3047
3048 return true;
3049}
3050
3051GCMetadataPrinter *AsmPrinter::GetOrCreateGCPrinter(GCStrategy &S) {
3052 if (!S.usesMetadata())
3053 return nullptr;
3054
3055 gcp_map_type &GCMap = getGCMap(GCMetadataPrinters);
3056 gcp_map_type::iterator GCPI = GCMap.find(&S);
3057 if (GCPI != GCMap.end())
3058 return GCPI->second.get();
3059
3060 auto Name = S.getName();
3061
3062 for (GCMetadataPrinterRegistry::iterator
3063 I = GCMetadataPrinterRegistry::begin(),
3064 E = GCMetadataPrinterRegistry::end(); I != E; ++I)
3065 if (Name == I->getName()) {
3066 std::unique_ptr<GCMetadataPrinter> GMP = I->instantiate();
3067 GMP->S = &S;
3068 auto IterBool = GCMap.insert(std::make_pair(&S, std::move(GMP)));
3069 return IterBool.first->second.get();
3070 }
3071
3072 report_fatal_error("no GCMetadataPrinter registered for GC: " + Twine(Name));
3073}
3074
3075void AsmPrinter::emitStackMaps(StackMaps &SM) {
3076 GCModuleInfo *MI = getAnalysisIfAvailable<GCModuleInfo>();
3077 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-10~+201911111502510600c19528f1809/llvm/lib/CodeGen/AsmPrinter/AsmPrinter.cpp"
, 3077, __PRETTY_FUNCTION__))
;
3078 bool NeedsDefault = false;
3079 if (MI->begin() == MI->end())
3080 // No GC strategy, use the default format.
3081 NeedsDefault = true;
3082 else
3083 for (auto &I : *MI) {
3084 if (GCMetadataPrinter *MP = GetOrCreateGCPrinter(*I))
3085 if (MP->emitStackMaps(SM, *this))
3086 continue;
3087 // The strategy doesn't have printer or doesn't emit custom stack maps.
3088 // Use the default format.
3089 NeedsDefault = true;
3090 }
3091
3092 if (NeedsDefault)
3093 SM.serializeToStackMapSection();
3094}
3095
3096/// Pin vtable to this file.
3097AsmPrinterHandler::~AsmPrinterHandler() = default;
3098
3099void AsmPrinterHandler::markFunctionEnd() {}
3100
3101// In the binary's "xray_instr_map" section, an array of these function entries
3102// describes each instrumentation point. When XRay patches your code, the index
3103// into this table will be given to your handler as a patch point identifier.
3104void AsmPrinter::XRayFunctionEntry::emit(int Bytes, MCStreamer *Out,
3105 const MCSymbol *CurrentFnSym) const {
3106 Out->EmitSymbolValue(Sled, Bytes);
3107 Out->EmitSymbolValue(CurrentFnSym, Bytes);
3108 auto Kind8 = static_cast<uint8_t>(Kind);
3109 Out->EmitBinaryData(StringRef(reinterpret_cast<const char *>(&Kind8), 1));
3110 Out->EmitBinaryData(
3111 StringRef(reinterpret_cast<const char *>(&AlwaysInstrument), 1));
3112 Out->EmitBinaryData(StringRef(reinterpret_cast<const char *>(&Version), 1));
3113 auto Padding = (4 * Bytes) - ((2 * Bytes) + 3);
3114 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-10~+201911111502510600c19528f1809/llvm/lib/CodeGen/AsmPrinter/AsmPrinter.cpp"
, 3114, __PRETTY_FUNCTION__))
;
3115 Out->EmitZeros(Padding);
3116}
3117
3118void AsmPrinter::emitXRayTable() {
3119 if (Sleds.empty())
3120 return;
3121
3122 auto PrevSection = OutStreamer->getCurrentSectionOnly();
3123 const Function &F = MF->getFunction();
3124 MCSection *InstMap = nullptr;
3125 MCSection *FnSledIndex = nullptr;
3126 if (MF->getSubtarget().getTargetTriple().isOSBinFormatELF()) {
3127 auto Associated = dyn_cast<MCSymbolELF>(CurrentFnSym);
3128 assert(Associated != nullptr)((Associated != nullptr) ? static_cast<void> (0) : __assert_fail
("Associated != nullptr", "/build/llvm-toolchain-snapshot-10~+201911111502510600c19528f1809/llvm/lib/CodeGen/AsmPrinter/AsmPrinter.cpp"
, 3128, __PRETTY_FUNCTION__))
;
3129 auto Flags = ELF::SHF_WRITE | ELF::SHF_ALLOC | ELF::SHF_LINK_ORDER;
3130 std::string GroupName;
3131 if (F.hasComdat()) {
3132 Flags |= ELF::SHF_GROUP;
3133 GroupName = F.getComdat()->getName();
3134 }
3135
3136 auto UniqueID = ++XRayFnUniqueID;
3137 InstMap =
3138 OutContext.getELFSection("xray_instr_map", ELF::SHT_PROGBITS, Flags, 0,
3139 GroupName, UniqueID, Associated);
3140 FnSledIndex =
3141 OutContext.getELFSection("xray_fn_idx", ELF::SHT_PROGBITS, Flags, 0,
3142 GroupName, UniqueID, Associated);
3143 } else if (MF->getSubtarget().getTargetTriple().isOSBinFormatMachO()) {
3144 InstMap = OutContext.getMachOSection("__DATA", "xray_instr_map", 0,
3145 SectionKind::getReadOnlyWithRel());
3146 FnSledIndex = OutContext.getMachOSection("__DATA", "xray_fn_idx", 0,
3147 SectionKind::getReadOnlyWithRel());
3148 } else {
3149 llvm_unreachable("Unsupported target")::llvm::llvm_unreachable_internal("Unsupported target", "/build/llvm-toolchain-snapshot-10~+201911111502510600c19528f1809/llvm/lib/CodeGen/AsmPrinter/AsmPrinter.cpp"
, 3149)
;
3150 }
3151
3152 auto WordSizeBytes = MAI->getCodePointerSize();
3153
3154 // Now we switch to the instrumentation map section. Because this is done
3155 // per-function, we are able to create an index entry that will represent the
3156 // range of sleds associated with a function.
3157 MCSymbol *SledsStart = OutContext.createTempSymbol("xray_sleds_start", true);
3158 OutStreamer->SwitchSection(InstMap);
3159 OutStreamer->EmitLabel(SledsStart);
3160 for (const auto &Sled : Sleds)
3161 Sled.emit(WordSizeBytes, OutStreamer.get(), CurrentFnSym);
3162 MCSymbol *SledsEnd = OutContext.createTempSymbol("xray_sleds_end", true);
3163 OutStreamer->EmitLabel(SledsEnd);
3164
3165 // We then emit a single entry in the index per function. We use the symbols
3166 // that bound the instrumentation map as the range for a specific function.
3167 // Each entry here will be 2 * word size aligned, as we're writing down two
3168 // pointers. This should work for both 32-bit and 64-bit platforms.
3169 OutStreamer->SwitchSection(FnSledIndex);
3170 OutStreamer->EmitCodeAlignment(2 * WordSizeBytes);
3171 OutStreamer->EmitSymbolValue(SledsStart, WordSizeBytes, false);
3172 OutStreamer->EmitSymbolValue(SledsEnd, WordSizeBytes, false);
3173 OutStreamer->SwitchSection(PrevSection);
3174 Sleds.clear();
3175}
3176
3177void AsmPrinter::recordSled(MCSymbol *Sled, const MachineInstr &MI,
3178 SledKind Kind, uint8_t Version) {
3179 const Function &F = MI.getMF()->getFunction();
3180 auto Attr = F.getFnAttribute("function-instrument");
3181 bool LogArgs = F.hasFnAttribute("xray-log-args");
3182 bool AlwaysInstrument =
3183 Attr.isStringAttribute() && Attr.getValueAsString() == "xray-always";
3184 if (Kind == SledKind::FUNCTION_ENTER && LogArgs)
3185 Kind = SledKind::LOG_ARGS_ENTER;
3186 Sleds.emplace_back(XRayFunctionEntry{Sled, CurrentFnSym, Kind,
3187 AlwaysInstrument, &F, Version});
3188}
3189
3190uint16_t AsmPrinter::getDwarfVersion() const {
3191 return OutStreamer->getContext().getDwarfVersion();
3192}
3193
3194void AsmPrinter::setDwarfVersion(uint16_t Version) {
3195 OutStreamer->getContext().setDwarfVersion(Version);
3196}