Bug Summary

File:llvm/lib/CodeGen/AsmPrinter/AsmPrinter.cpp
Warning:line 315, 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 -target-cpu x86-64 -dwarf-column-info -fno-split-dwarf-inlining -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~++20200112100611+7fa5290d5bd/build-llvm/lib/CodeGen/AsmPrinter -I /build/llvm-toolchain-snapshot-10~++20200112100611+7fa5290d5bd/llvm/lib/CodeGen/AsmPrinter -I /build/llvm-toolchain-snapshot-10~++20200112100611+7fa5290d5bd/build-llvm/include -I /build/llvm-toolchain-snapshot-10~++20200112100611+7fa5290d5bd/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~++20200112100611+7fa5290d5bd/build-llvm/lib/CodeGen/AsmPrinter -fdebug-prefix-map=/build/llvm-toolchain-snapshot-10~++20200112100611+7fa5290d5bd=. -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-2020-01-13-084841-49055-1 -x c++ /build/llvm-toolchain-snapshot-10~++20200112100611+7fa5290d5bd/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/Analysis/ProfileSummaryInfo.h"
35#include "llvm/BinaryFormat/COFF.h"
36#include "llvm/BinaryFormat/Dwarf.h"
37#include "llvm/BinaryFormat/ELF.h"
38#include "llvm/CodeGen/GCMetadata.h"
39#include "llvm/CodeGen/GCMetadataPrinter.h"
40#include "llvm/CodeGen/GCStrategy.h"
41#include "llvm/CodeGen/LazyMachineBlockFrequencyInfo.h"
42#include "llvm/CodeGen/MachineBasicBlock.h"
43#include "llvm/CodeGen/MachineBlockFrequencyInfo.h"
44#include "llvm/CodeGen/MachineConstantPool.h"
45#include "llvm/CodeGen/MachineDominators.h"
46#include "llvm/CodeGen/MachineFrameInfo.h"
47#include "llvm/CodeGen/MachineFunction.h"
48#include "llvm/CodeGen/MachineFunctionPass.h"
49#include "llvm/CodeGen/MachineInstr.h"
50#include "llvm/CodeGen/MachineInstrBundle.h"
51#include "llvm/CodeGen/MachineJumpTableInfo.h"
52#include "llvm/CodeGen/MachineLoopInfo.h"
53#include "llvm/CodeGen/MachineMemOperand.h"
54#include "llvm/CodeGen/MachineModuleInfo.h"
55#include "llvm/CodeGen/MachineModuleInfoImpls.h"
56#include "llvm/CodeGen/MachineOperand.h"
57#include "llvm/CodeGen/MachineOptimizationRemarkEmitter.h"
58#include "llvm/CodeGen/MachineSizeOpts.h"
59#include "llvm/CodeGen/StackMaps.h"
60#include "llvm/CodeGen/TargetFrameLowering.h"
61#include "llvm/CodeGen/TargetInstrInfo.h"
62#include "llvm/CodeGen/TargetLowering.h"
63#include "llvm/CodeGen/TargetOpcodes.h"
64#include "llvm/CodeGen/TargetRegisterInfo.h"
65#include "llvm/IR/BasicBlock.h"
66#include "llvm/IR/Comdat.h"
67#include "llvm/IR/Constant.h"
68#include "llvm/IR/Constants.h"
69#include "llvm/IR/DataLayout.h"
70#include "llvm/IR/DebugInfoMetadata.h"
71#include "llvm/IR/DerivedTypes.h"
72#include "llvm/IR/Function.h"
73#include "llvm/IR/GlobalAlias.h"
74#include "llvm/IR/GlobalIFunc.h"
75#include "llvm/IR/GlobalIndirectSymbol.h"
76#include "llvm/IR/GlobalObject.h"
77#include "llvm/IR/GlobalValue.h"
78#include "llvm/IR/GlobalVariable.h"
79#include "llvm/IR/Instruction.h"
80#include "llvm/IR/Mangler.h"
81#include "llvm/IR/Metadata.h"
82#include "llvm/IR/Module.h"
83#include "llvm/IR/Operator.h"
84#include "llvm/IR/RemarkStreamer.h"
85#include "llvm/IR/Type.h"
86#include "llvm/IR/Value.h"
87#include "llvm/MC/MCAsmInfo.h"
88#include "llvm/MC/MCContext.h"
89#include "llvm/MC/MCDirectives.h"
90#include "llvm/MC/MCDwarf.h"
91#include "llvm/MC/MCExpr.h"
92#include "llvm/MC/MCInst.h"
93#include "llvm/MC/MCSection.h"
94#include "llvm/MC/MCSectionCOFF.h"
95#include "llvm/MC/MCSectionELF.h"
96#include "llvm/MC/MCSectionMachO.h"
97#include "llvm/MC/MCSectionXCOFF.h"
98#include "llvm/MC/MCStreamer.h"
99#include "llvm/MC/MCSubtargetInfo.h"
100#include "llvm/MC/MCSymbol.h"
101#include "llvm/MC/MCSymbolELF.h"
102#include "llvm/MC/MCSymbolXCOFF.h"
103#include "llvm/MC/MCTargetOptions.h"
104#include "llvm/MC/MCValue.h"
105#include "llvm/MC/SectionKind.h"
106#include "llvm/Pass.h"
107#include "llvm/Remarks/Remark.h"
108#include "llvm/Remarks/RemarkFormat.h"
109#include "llvm/Remarks/RemarkStringTable.h"
110#include "llvm/Support/Casting.h"
111#include "llvm/Support/CommandLine.h"
112#include "llvm/Support/Compiler.h"
113#include "llvm/Support/ErrorHandling.h"
114#include "llvm/Support/Format.h"
115#include "llvm/Support/MathExtras.h"
116#include "llvm/Support/Path.h"
117#include "llvm/Support/TargetRegistry.h"
118#include "llvm/Support/Timer.h"
119#include "llvm/Support/raw_ostream.h"
120#include "llvm/Target/TargetLoweringObjectFile.h"
121#include "llvm/Target/TargetMachine.h"
122#include "llvm/Target/TargetOptions.h"
123#include <algorithm>
124#include <cassert>
125#include <cinttypes>
126#include <cstdint>
127#include <iterator>
128#include <limits>
129#include <memory>
130#include <string>
131#include <utility>
132#include <vector>
133
134using namespace llvm;
135
136#define DEBUG_TYPE"asm-printer" "asm-printer"
137
138static const char *const DWARFGroupName = "dwarf";
139static const char *const DWARFGroupDescription = "DWARF Emission";
140static const char *const DbgTimerName = "emit";
141static const char *const DbgTimerDescription = "Debug Info Emission";
142static const char *const EHTimerName = "write_exception";
143static const char *const EHTimerDescription = "DWARF Exception Writer";
144static const char *const CFGuardName = "Control Flow Guard";
145static const char *const CFGuardDescription = "Control Flow Guard";
146static const char *const CodeViewLineTablesGroupName = "linetables";
147static const char *const CodeViewLineTablesGroupDescription =
148 "CodeView Line Tables";
149
150STATISTIC(EmittedInsts, "Number of machine instrs printed")static llvm::Statistic EmittedInsts = {"asm-printer", "EmittedInsts"
, "Number of machine instrs printed"}
;
151
152char AsmPrinter::ID = 0;
153
154using gcp_map_type = DenseMap<GCStrategy *, std::unique_ptr<GCMetadataPrinter>>;
155
156static gcp_map_type &getGCMap(void *&P) {
157 if (!P)
158 P = new gcp_map_type();
159 return *(gcp_map_type*)P;
160}
161
162/// getGVAlignment - Return the alignment to use for the specified global
163/// value. This rounds up to the preferred alignment if possible and legal.
164Align AsmPrinter::getGVAlignment(const GlobalValue *GV, const DataLayout &DL,
165 Align InAlign) {
166 Align Alignment;
167 if (const GlobalVariable *GVar = dyn_cast<GlobalVariable>(GV))
168 Alignment = Align(DL.getPreferredAlignment(GVar));
169
170 // If InAlign is specified, round it to it.
171 if (InAlign > Alignment)
172 Alignment = InAlign;
173
174 // If the GV has a specified alignment, take it into account.
175 const MaybeAlign GVAlign(GV->getAlignment());
176 if (!GVAlign)
177 return Alignment;
178
179 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~++20200112100611+7fa5290d5bd/llvm/lib/CodeGen/AsmPrinter/AsmPrinter.cpp"
, 179, __PRETTY_FUNCTION__))
;
180
181 // If the GVAlign is larger than NumBits, or if we are required to obey
182 // NumBits because the GV has an assigned section, obey it.
183 if (*GVAlign > Alignment || GV->hasSection())
184 Alignment = *GVAlign;
185 return Alignment;
186}
187
188AsmPrinter::AsmPrinter(TargetMachine &tm, std::unique_ptr<MCStreamer> Streamer)
189 : MachineFunctionPass(ID), TM(tm), MAI(tm.getMCAsmInfo()),
190 OutContext(Streamer->getContext()), OutStreamer(std::move(Streamer)) {
191 VerboseAsm = OutStreamer->isVerboseAsm();
192}
193
194AsmPrinter::~AsmPrinter() {
195 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~++20200112100611+7fa5290d5bd/llvm/lib/CodeGen/AsmPrinter/AsmPrinter.cpp"
, 195, __PRETTY_FUNCTION__))
;
196
197 if (GCMetadataPrinters) {
198 gcp_map_type &GCMap = getGCMap(GCMetadataPrinters);
199
200 delete &GCMap;
201 GCMetadataPrinters = nullptr;
202 }
203}
204
205bool AsmPrinter::isPositionIndependent() const {
206 return TM.isPositionIndependent();
207}
208
209/// getFunctionNumber - Return a unique ID for the current function.
210unsigned AsmPrinter::getFunctionNumber() const {
211 return MF->getFunctionNumber();
212}
213
214const TargetLoweringObjectFile &AsmPrinter::getObjFileLowering() const {
215 return *TM.getObjFileLowering();
216}
217
218const DataLayout &AsmPrinter::getDataLayout() const {
219 return MMI->getModule()->getDataLayout();
220}
221
222// Do not use the cached DataLayout because some client use it without a Module
223// (dsymutil, llvm-dwarfdump).
224unsigned AsmPrinter::getPointerSize() const {
225 return TM.getPointerSize(0); // FIXME: Default address space
226}
227
228const MCSubtargetInfo &AsmPrinter::getSubtargetInfo() const {
229 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~++20200112100611+7fa5290d5bd/llvm/lib/CodeGen/AsmPrinter/AsmPrinter.cpp"
, 229, __PRETTY_FUNCTION__))
;
230 return MF->getSubtarget<MCSubtargetInfo>();
231}
232
233void AsmPrinter::EmitToStreamer(MCStreamer &S, const MCInst &Inst) {
234 S.EmitInstruction(Inst, getSubtargetInfo());
235}
236
237void AsmPrinter::emitInitialRawDwarfLocDirective(const MachineFunction &MF) {
238 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~++20200112100611+7fa5290d5bd/llvm/lib/CodeGen/AsmPrinter/AsmPrinter.cpp"
, 238, __PRETTY_FUNCTION__))
;
239 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~++20200112100611+7fa5290d5bd/llvm/lib/CodeGen/AsmPrinter/AsmPrinter.cpp"
, 239, __PRETTY_FUNCTION__))
;
240 (void)DD->emitInitialLocDirective(MF, /*CUID=*/0);
241}
242
243/// getCurrentSection() - Return the current section we are emitting to.
244const MCSection *AsmPrinter::getCurrentSection() const {
245 return OutStreamer->getCurrentSectionOnly();
246}
247
248void AsmPrinter::getAnalysisUsage(AnalysisUsage &AU) const {
249 AU.setPreservesAll();
250 MachineFunctionPass::getAnalysisUsage(AU);
251 AU.addRequired<MachineModuleInfoWrapperPass>();
252 AU.addRequired<MachineOptimizationRemarkEmitterPass>();
253 AU.addRequired<GCModuleInfo>();
254 AU.addRequired<LazyMachineBlockFrequencyInfoPass>();
255 AU.addRequired<ProfileSummaryInfoWrapperPass>();
256}
257
258bool AsmPrinter::doInitialization(Module &M) {
259 auto *MMIWP = getAnalysisIfAvailable<MachineModuleInfoWrapperPass>();
260 MMI = MMIWP
0.1
'MMIWP' is null
? &MMIWP->getMMI() : nullptr
;
1
'?' condition is false
2
Null pointer value stored to field 'MMI'
261
262 // Initialize TargetLoweringObjectFile.
263 const_cast<TargetLoweringObjectFile&>(getObjFileLowering())
264 .Initialize(OutContext, TM);
265
266 const_cast<TargetLoweringObjectFile &>(getObjFileLowering())
267 .getModuleMetadata(M);
268
269 OutStreamer->InitSections(false);
270
271 // Emit the version-min deployment target directive if needed.
272 //
273 // FIXME: If we end up with a collection of these sorts of Darwin-specific
274 // or ELF-specific things, it may make sense to have a platform helper class
275 // that will work with the target helper class. For now keep it here, as the
276 // alternative is duplicated code in each of the target asm printers that
277 // use the directive, where it would need the same conditionalization
278 // anyway.
279 const Triple &Target = TM.getTargetTriple();
280 OutStreamer->EmitVersionForTarget(Target, M.getSDKVersion());
281
282 // Allow the target to emit any magic that it wants at the start of the file.
283 EmitStartOfAsmFile(M);
284
285 // Very minimal debug info. It is ignored if we emit actual debug info. If we
286 // don't, this at least helps the user find where a global came from.
287 if (MAI->hasSingleParameterDotFile()) {
3
Assuming the condition is false
4
Taking false branch
288 // .file "foo.c"
289 OutStreamer->EmitFileDirective(
290 llvm::sys::path::filename(M.getSourceFileName()));
291 }
292
293 GCModuleInfo *MI = getAnalysisIfAvailable<GCModuleInfo>();
294 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~++20200112100611+7fa5290d5bd/llvm/lib/CodeGen/AsmPrinter/AsmPrinter.cpp"
, 294, __PRETTY_FUNCTION__))
;
5
Assuming 'MI' is non-null
6
'?' condition is true
295 for (auto &I : *MI)
7
Assuming '__begin1' is equal to '__end1'
296 if (GCMetadataPrinter *MP = GetOrCreateGCPrinter(*I))
297 MP->beginAssembly(M, *MI, *this);
298
299 // Emit module-level inline asm if it exists.
300 if (!M.getModuleInlineAsm().empty()) {
8
Assuming the condition is false
9
Taking false branch
301 // We're at the module level. Construct MCSubtarget from the default CPU
302 // and target triple.
303 std::unique_ptr<MCSubtargetInfo> STI(TM.getTarget().createMCSubtargetInfo(
304 TM.getTargetTriple().str(), TM.getTargetCPU(),
305 TM.getTargetFeatureString()));
306 OutStreamer->AddComment("Start of file scope inline assembly");
307 OutStreamer->AddBlankLine();
308 EmitInlineAsm(M.getModuleInlineAsm()+"\n",
309 OutContext.getSubtargetCopy(*STI), TM.Options.MCOptions);
310 OutStreamer->AddComment("End of file scope inline assembly");
311 OutStreamer->AddBlankLine();
312 }
313
314 if (MAI->doesSupportDebugInformation()) {
10
Assuming the condition is true
11
Taking true branch
315 bool EmitCodeView = MMI->getModule()->getCodeViewFlag();
12
Called C++ object pointer is null
316 if (EmitCodeView && TM.getTargetTriple().isOSWindows()) {
317 Handlers.emplace_back(std::make_unique<CodeViewDebug>(this),
318 DbgTimerName, DbgTimerDescription,
319 CodeViewLineTablesGroupName,
320 CodeViewLineTablesGroupDescription);
321 }
322 if (!EmitCodeView || MMI->getModule()->getDwarfVersion()) {
323 DD = new DwarfDebug(this, &M);
324 DD->beginModule();
325 Handlers.emplace_back(std::unique_ptr<DwarfDebug>(DD), DbgTimerName,
326 DbgTimerDescription, DWARFGroupName,
327 DWARFGroupDescription);
328 }
329 }
330
331 switch (MAI->getExceptionHandlingType()) {
332 case ExceptionHandling::SjLj:
333 case ExceptionHandling::DwarfCFI:
334 case ExceptionHandling::ARM:
335 isCFIMoveForDebugging = true;
336 if (MAI->getExceptionHandlingType() != ExceptionHandling::DwarfCFI)
337 break;
338 for (auto &F: M.getFunctionList()) {
339 // If the module contains any function with unwind data,
340 // .eh_frame has to be emitted.
341 // Ignore functions that won't get emitted.
342 if (!F.isDeclarationForLinker() && F.needsUnwindTableEntry()) {
343 isCFIMoveForDebugging = false;
344 break;
345 }
346 }
347 break;
348 default:
349 isCFIMoveForDebugging = false;
350 break;
351 }
352
353 EHStreamer *ES = nullptr;
354 switch (MAI->getExceptionHandlingType()) {
355 case ExceptionHandling::None:
356 break;
357 case ExceptionHandling::SjLj:
358 case ExceptionHandling::DwarfCFI:
359 ES = new DwarfCFIException(this);
360 break;
361 case ExceptionHandling::ARM:
362 ES = new ARMException(this);
363 break;
364 case ExceptionHandling::WinEH:
365 switch (MAI->getWinEHEncodingType()) {
366 default: llvm_unreachable("unsupported unwinding information encoding")::llvm::llvm_unreachable_internal("unsupported unwinding information encoding"
, "/build/llvm-toolchain-snapshot-10~++20200112100611+7fa5290d5bd/llvm/lib/CodeGen/AsmPrinter/AsmPrinter.cpp"
, 366)
;
367 case WinEH::EncodingType::Invalid:
368 break;
369 case WinEH::EncodingType::X86:
370 case WinEH::EncodingType::Itanium:
371 ES = new WinException(this);
372 break;
373 }
374 break;
375 case ExceptionHandling::Wasm:
376 ES = new WasmException(this);
377 break;
378 }
379 if (ES)
380 Handlers.emplace_back(std::unique_ptr<EHStreamer>(ES), EHTimerName,
381 EHTimerDescription, DWARFGroupName,
382 DWARFGroupDescription);
383
384 // Emit tables for any value of cfguard flag (i.e. cfguard=1 or cfguard=2).
385 if (mdconst::extract_or_null<ConstantInt>(
386 MMI->getModule()->getModuleFlag("cfguard")))
387 Handlers.emplace_back(std::make_unique<WinCFGuard>(this), CFGuardName,
388 CFGuardDescription, DWARFGroupName,
389 DWARFGroupDescription);
390 return false;
391}
392
393static bool canBeHidden(const GlobalValue *GV, const MCAsmInfo &MAI) {
394 if (!MAI.hasWeakDefCanBeHiddenDirective())
395 return false;
396
397 return GV->canBeOmittedFromSymbolTable();
398}
399
400void AsmPrinter::EmitLinkage(const GlobalValue *GV, MCSymbol *GVSym) const {
401 GlobalValue::LinkageTypes Linkage = GV->getLinkage();
402 switch (Linkage) {
403 case GlobalValue::CommonLinkage:
404 case GlobalValue::LinkOnceAnyLinkage:
405 case GlobalValue::LinkOnceODRLinkage:
406 case GlobalValue::WeakAnyLinkage:
407 case GlobalValue::WeakODRLinkage:
408 if (MAI->hasWeakDefDirective()) {
409 // .globl _foo
410 OutStreamer->EmitSymbolAttribute(GVSym, MCSA_Global);
411
412 if (!canBeHidden(GV, *MAI))
413 // .weak_definition _foo
414 OutStreamer->EmitSymbolAttribute(GVSym, MCSA_WeakDefinition);
415 else
416 OutStreamer->EmitSymbolAttribute(GVSym, MCSA_WeakDefAutoPrivate);
417 } else if (MAI->hasLinkOnceDirective()) {
418 // .globl _foo
419 OutStreamer->EmitSymbolAttribute(GVSym, MCSA_Global);
420 //NOTE: linkonce is handled by the section the symbol was assigned to.
421 } else {
422 // .weak _foo
423 OutStreamer->EmitSymbolAttribute(GVSym, MCSA_Weak);
424 }
425 return;
426 case GlobalValue::ExternalLinkage:
427 // If external, declare as a global symbol: .globl _foo
428 OutStreamer->EmitSymbolAttribute(GVSym, MCSA_Global);
429 return;
430 case GlobalValue::PrivateLinkage:
431 return;
432 case GlobalValue::InternalLinkage:
433 if (MAI->hasDotLGloblDirective())
434 OutStreamer->EmitSymbolAttribute(GVSym, MCSA_LGlobal);
435 return;
436 case GlobalValue::AppendingLinkage:
437 case GlobalValue::AvailableExternallyLinkage:
438 case GlobalValue::ExternalWeakLinkage:
439 llvm_unreachable("Should never emit this")::llvm::llvm_unreachable_internal("Should never emit this", "/build/llvm-toolchain-snapshot-10~++20200112100611+7fa5290d5bd/llvm/lib/CodeGen/AsmPrinter/AsmPrinter.cpp"
, 439)
;
440 }
441 llvm_unreachable("Unknown linkage type!")::llvm::llvm_unreachable_internal("Unknown linkage type!", "/build/llvm-toolchain-snapshot-10~++20200112100611+7fa5290d5bd/llvm/lib/CodeGen/AsmPrinter/AsmPrinter.cpp"
, 441)
;
442}
443
444void AsmPrinter::getNameWithPrefix(SmallVectorImpl<char> &Name,
445 const GlobalValue *GV) const {
446 TM.getNameWithPrefix(Name, GV, getObjFileLowering().getMangler());
447}
448
449MCSymbol *AsmPrinter::getSymbol(const GlobalValue *GV) const {
450 return TM.getSymbol(GV);
451}
452
453/// EmitGlobalVariable - Emit the specified global variable to the .s file.
454void AsmPrinter::EmitGlobalVariable(const GlobalVariable *GV) {
455 bool IsEmuTLSVar = TM.useEmulatedTLS() && GV->isThreadLocal();
456 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~++20200112100611+7fa5290d5bd/llvm/lib/CodeGen/AsmPrinter/AsmPrinter.cpp"
, 457, __PRETTY_FUNCTION__))
457 "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~++20200112100611+7fa5290d5bd/llvm/lib/CodeGen/AsmPrinter/AsmPrinter.cpp"
, 457, __PRETTY_FUNCTION__))
;
458
459 // Never emit TLS variable xyz in emulated TLS model.
460 // The initialization value is in __emutls_t.xyz instead of xyz.
461 if (IsEmuTLSVar)
462 return;
463
464 if (GV->hasInitializer()) {
465 // Check to see if this is a special global used by LLVM, if so, emit it.
466 if (EmitSpecialLLVMGlobal(GV))
467 return;
468
469 // Skip the emission of global equivalents. The symbol can be emitted later
470 // on by emitGlobalGOTEquivs in case it turns out to be needed.
471 if (GlobalGOTEquivs.count(getSymbol(GV)))
472 return;
473
474 if (isVerbose()) {
475 // When printing the control variable __emutls_v.*,
476 // we don't need to print the original TLS variable name.
477 GV->printAsOperand(OutStreamer->GetCommentOS(),
478 /*PrintType=*/false, GV->getParent());
479 OutStreamer->GetCommentOS() << '\n';
480 }
481 }
482
483 MCSymbol *GVSym = getSymbol(GV);
484 MCSymbol *EmittedSym = GVSym;
485
486 // getOrCreateEmuTLSControlSym only creates the symbol with name and default
487 // attributes.
488 // GV's or GVSym's attributes will be used for the EmittedSym.
489 EmitVisibility(EmittedSym, GV->getVisibility(), !GV->isDeclaration());
490
491 if (!GV->hasInitializer()) // External globals require no extra code.
492 return;
493
494 GVSym->redefineIfPossible();
495 if (GVSym->isDefined() || GVSym->isVariable())
496 report_fatal_error("symbol '" + Twine(GVSym->getName()) +
497 "' is already defined");
498
499 if (MAI->hasDotTypeDotSizeDirective())
500 OutStreamer->EmitSymbolAttribute(EmittedSym, MCSA_ELF_TypeObject);
501
502 SectionKind GVKind = TargetLoweringObjectFile::getKindForGlobal(GV, TM);
503
504 const DataLayout &DL = GV->getParent()->getDataLayout();
505 uint64_t Size = DL.getTypeAllocSize(GV->getValueType());
506
507 // If the alignment is specified, we *must* obey it. Overaligning a global
508 // with a specified alignment is a prompt way to break globals emitted to
509 // sections and expected to be contiguous (e.g. ObjC metadata).
510 const Align Alignment = getGVAlignment(GV, DL);
511
512 for (const HandlerInfo &HI : Handlers) {
513 NamedRegionTimer T(HI.TimerName, HI.TimerDescription,
514 HI.TimerGroupName, HI.TimerGroupDescription,
515 TimePassesIsEnabled);
516 HI.Handler->setSymbolSize(GVSym, Size);
517 }
518
519 // Handle common symbols
520 if (GVKind.isCommon()) {
521 if (Size == 0) Size = 1; // .comm Foo, 0 is undefined, avoid it.
522 // .comm _foo, 42, 4
523 const bool SupportsAlignment =
524 getObjFileLowering().getCommDirectiveSupportsAlignment();
525 OutStreamer->EmitCommonSymbol(GVSym, Size,
526 SupportsAlignment ? Alignment.value() : 0);
527 return;
528 }
529
530 // Determine to which section this global should be emitted.
531 MCSection *TheSection = getObjFileLowering().SectionForGlobal(GV, GVKind, TM);
532
533 // If we have a bss global going to a section that supports the
534 // zerofill directive, do so here.
535 if (GVKind.isBSS() && MAI->hasMachoZeroFillDirective() &&
536 TheSection->isVirtualSection()) {
537 if (Size == 0)
538 Size = 1; // zerofill of 0 bytes is undefined.
539 EmitLinkage(GV, GVSym);
540 // .zerofill __DATA, __bss, _foo, 400, 5
541 OutStreamer->EmitZerofill(TheSection, GVSym, Size, Alignment.value());
542 return;
543 }
544
545 // If this is a BSS local symbol and we are emitting in the BSS
546 // section use .lcomm/.comm directive.
547 if (GVKind.isBSSLocal() &&
548 getObjFileLowering().getBSSSection() == TheSection) {
549 if (Size == 0)
550 Size = 1; // .comm Foo, 0 is undefined, avoid it.
551
552 // Use .lcomm only if it supports user-specified alignment.
553 // Otherwise, while it would still be correct to use .lcomm in some
554 // cases (e.g. when Align == 1), the external assembler might enfore
555 // some -unknown- default alignment behavior, which could cause
556 // spurious differences between external and integrated assembler.
557 // Prefer to simply fall back to .local / .comm in this case.
558 if (MAI->getLCOMMDirectiveAlignmentType() != LCOMM::NoAlignment) {
559 // .lcomm _foo, 42
560 OutStreamer->EmitLocalCommonSymbol(GVSym, Size, Alignment.value());
561 return;
562 }
563
564 // .local _foo
565 OutStreamer->EmitSymbolAttribute(GVSym, MCSA_Local);
566 // .comm _foo, 42, 4
567 const bool SupportsAlignment =
568 getObjFileLowering().getCommDirectiveSupportsAlignment();
569 OutStreamer->EmitCommonSymbol(GVSym, Size,
570 SupportsAlignment ? Alignment.value() : 0);
571 return;
572 }
573
574 // Handle thread local data for mach-o which requires us to output an
575 // additional structure of data and mangle the original symbol so that we
576 // can reference it later.
577 //
578 // TODO: This should become an "emit thread local global" method on TLOF.
579 // All of this macho specific stuff should be sunk down into TLOFMachO and
580 // stuff like "TLSExtraDataSection" should no longer be part of the parent
581 // TLOF class. This will also make it more obvious that stuff like
582 // MCStreamer::EmitTBSSSymbol is macho specific and only called from macho
583 // specific code.
584 if (GVKind.isThreadLocal() && MAI->hasMachoTBSSDirective()) {
585 // Emit the .tbss symbol
586 MCSymbol *MangSym =
587 OutContext.getOrCreateSymbol(GVSym->getName() + Twine("$tlv$init"));
588
589 if (GVKind.isThreadBSS()) {
590 TheSection = getObjFileLowering().getTLSBSSSection();
591 OutStreamer->EmitTBSSSymbol(TheSection, MangSym, Size, Alignment.value());
592 } else if (GVKind.isThreadData()) {
593 OutStreamer->SwitchSection(TheSection);
594
595 EmitAlignment(Alignment, GV);
596 OutStreamer->EmitLabel(MangSym);
597
598 EmitGlobalConstant(GV->getParent()->getDataLayout(),
599 GV->getInitializer());
600 }
601
602 OutStreamer->AddBlankLine();
603
604 // Emit the variable struct for the runtime.
605 MCSection *TLVSect = getObjFileLowering().getTLSExtraDataSection();
606
607 OutStreamer->SwitchSection(TLVSect);
608 // Emit the linkage here.
609 EmitLinkage(GV, GVSym);
610 OutStreamer->EmitLabel(GVSym);
611
612 // Three pointers in size:
613 // - __tlv_bootstrap - used to make sure support exists
614 // - spare pointer, used when mapped by the runtime
615 // - pointer to mangled symbol above with initializer
616 unsigned PtrSize = DL.getPointerTypeSize(GV->getType());
617 OutStreamer->EmitSymbolValue(GetExternalSymbolSymbol("_tlv_bootstrap"),
618 PtrSize);
619 OutStreamer->EmitIntValue(0, PtrSize);
620 OutStreamer->EmitSymbolValue(MangSym, PtrSize);
621
622 OutStreamer->AddBlankLine();
623 return;
624 }
625
626 MCSymbol *EmittedInitSym = GVSym;
627
628 OutStreamer->SwitchSection(TheSection);
629
630 EmitLinkage(GV, EmittedInitSym);
631 EmitAlignment(Alignment, GV);
632
633 OutStreamer->EmitLabel(EmittedInitSym);
634
635 EmitGlobalConstant(GV->getParent()->getDataLayout(), GV->getInitializer());
636
637 if (MAI->hasDotTypeDotSizeDirective())
638 // .size foo, 42
639 OutStreamer->emitELFSize(EmittedInitSym,
640 MCConstantExpr::create(Size, OutContext));
641
642 OutStreamer->AddBlankLine();
643}
644
645/// Emit the directive and value for debug thread local expression
646///
647/// \p Value - The value to emit.
648/// \p Size - The size of the integer (in bytes) to emit.
649void AsmPrinter::EmitDebugValue(const MCExpr *Value, unsigned Size) const {
650 OutStreamer->EmitValue(Value, Size);
651}
652
653/// EmitFunctionHeader - This method emits the header for the current
654/// function.
655void AsmPrinter::EmitFunctionHeader() {
656 const Function &F = MF->getFunction();
657
658 if (isVerbose())
659 OutStreamer->GetCommentOS()
660 << "-- Begin function "
661 << GlobalValue::dropLLVMManglingEscape(F.getName()) << '\n';
662
663 // Print out constants referenced by the function
664 EmitConstantPool();
665
666 // Print the 'header' of function.
667 OutStreamer->SwitchSection(getObjFileLowering().SectionForGlobal(&F, TM));
668 EmitVisibility(CurrentFnSym, F.getVisibility());
669
670 if (MAI->needsFunctionDescriptors() &&
671 F.getLinkage() != GlobalValue::InternalLinkage)
672 EmitLinkage(&F, CurrentFnDescSym);
673
674 EmitLinkage(&F, CurrentFnSym);
675 if (MAI->hasFunctionAlignment())
676 EmitAlignment(MF->getAlignment(), &F);
677
678 if (MAI->hasDotTypeDotSizeDirective())
679 OutStreamer->EmitSymbolAttribute(CurrentFnSym, MCSA_ELF_TypeFunction);
680
681 if (F.hasFnAttribute(Attribute::Cold))
682 OutStreamer->EmitSymbolAttribute(CurrentFnSym, MCSA_Cold);
683
684 if (isVerbose()) {
685 F.printAsOperand(OutStreamer->GetCommentOS(),
686 /*PrintType=*/false, F.getParent());
687 OutStreamer->GetCommentOS() << '\n';
688 }
689
690 // Emit the prefix data.
691 if (F.hasPrefixData()) {
692 if (MAI->hasSubsectionsViaSymbols()) {
693 // Preserving prefix data on platforms which use subsections-via-symbols
694 // is a bit tricky. Here we introduce a symbol for the prefix data
695 // and use the .alt_entry attribute to mark the function's real entry point
696 // as an alternative entry point to the prefix-data symbol.
697 MCSymbol *PrefixSym = OutContext.createLinkerPrivateTempSymbol();
698 OutStreamer->EmitLabel(PrefixSym);
699
700 EmitGlobalConstant(F.getParent()->getDataLayout(), F.getPrefixData());
701
702 // Emit an .alt_entry directive for the actual function symbol.
703 OutStreamer->EmitSymbolAttribute(CurrentFnSym, MCSA_AltEntry);
704 } else {
705 EmitGlobalConstant(F.getParent()->getDataLayout(), F.getPrefixData());
706 }
707 }
708
709 // Emit the function descriptor. This is a virtual function to allow targets
710 // to emit their specific function descriptor.
711 if (MAI->needsFunctionDescriptors())
712 EmitFunctionDescriptor();
713
714 // Emit the CurrentFnSym. This is a virtual function to allow targets to do
715 // their wild and crazy things as required.
716 EmitFunctionEntryLabel();
717
718 // If the function had address-taken blocks that got deleted, then we have
719 // references to the dangling symbols. Emit them at the start of the function
720 // so that we don't get references to undefined symbols.
721 std::vector<MCSymbol*> DeadBlockSyms;
722 MMI->takeDeletedSymbolsForFunction(&F, DeadBlockSyms);
723 for (unsigned i = 0, e = DeadBlockSyms.size(); i != e; ++i) {
724 OutStreamer->AddComment("Address taken block that was later removed");
725 OutStreamer->EmitLabel(DeadBlockSyms[i]);
726 }
727
728 if (CurrentFnBegin) {
729 if (MAI->useAssignmentForEHBegin()) {
730 MCSymbol *CurPos = OutContext.createTempSymbol();
731 OutStreamer->EmitLabel(CurPos);
732 OutStreamer->EmitAssignment(CurrentFnBegin,
733 MCSymbolRefExpr::create(CurPos, OutContext));
734 } else {
735 OutStreamer->EmitLabel(CurrentFnBegin);
736 }
737 }
738
739 // Emit pre-function debug and/or EH information.
740 for (const HandlerInfo &HI : Handlers) {
741 NamedRegionTimer T(HI.TimerName, HI.TimerDescription, HI.TimerGroupName,
742 HI.TimerGroupDescription, TimePassesIsEnabled);
743 HI.Handler->beginFunction(MF);
744 }
745
746 // Emit the prologue data.
747 if (F.hasPrologueData())
748 EmitGlobalConstant(F.getParent()->getDataLayout(), F.getPrologueData());
749}
750
751/// EmitFunctionEntryLabel - Emit the label that is the entrypoint for the
752/// function. This can be overridden by targets as required to do custom stuff.
753void AsmPrinter::EmitFunctionEntryLabel() {
754 CurrentFnSym->redefineIfPossible();
755
756 // The function label could have already been emitted if two symbols end up
757 // conflicting due to asm renaming. Detect this and emit an error.
758 if (CurrentFnSym->isVariable())
759 report_fatal_error("'" + Twine(CurrentFnSym->getName()) +
760 "' is a protected alias");
761 if (CurrentFnSym->isDefined())
762 report_fatal_error("'" + Twine(CurrentFnSym->getName()) +
763 "' label emitted multiple times to assembly file");
764
765 return OutStreamer->EmitLabel(CurrentFnSym);
766}
767
768/// emitComments - Pretty-print comments for instructions.
769static void emitComments(const MachineInstr &MI, raw_ostream &CommentOS) {
770 const MachineFunction *MF = MI.getMF();
771 const TargetInstrInfo *TII = MF->getSubtarget().getInstrInfo();
772
773 // Check for spills and reloads
774
775 // We assume a single instruction only has a spill or reload, not
776 // both.
777 Optional<unsigned> Size;
778 if ((Size = MI.getRestoreSize(TII))) {
779 CommentOS << *Size << "-byte Reload\n";
780 } else if ((Size = MI.getFoldedRestoreSize(TII))) {
781 if (*Size)
782 CommentOS << *Size << "-byte Folded Reload\n";
783 } else if ((Size = MI.getSpillSize(TII))) {
784 CommentOS << *Size << "-byte Spill\n";
785 } else if ((Size = MI.getFoldedSpillSize(TII))) {
786 if (*Size)
787 CommentOS << *Size << "-byte Folded Spill\n";
788 }
789
790 // Check for spill-induced copies
791 if (MI.getAsmPrinterFlag(MachineInstr::ReloadReuse))
792 CommentOS << " Reload Reuse\n";
793}
794
795/// emitImplicitDef - This method emits the specified machine instruction
796/// that is an implicit def.
797void AsmPrinter::emitImplicitDef(const MachineInstr *MI) const {
798 Register RegNo = MI->getOperand(0).getReg();
799
800 SmallString<128> Str;
801 raw_svector_ostream OS(Str);
802 OS << "implicit-def: "
803 << printReg(RegNo, MF->getSubtarget().getRegisterInfo());
804
805 OutStreamer->AddComment(OS.str());
806 OutStreamer->AddBlankLine();
807}
808
809static void emitKill(const MachineInstr *MI, AsmPrinter &AP) {
810 std::string Str;
811 raw_string_ostream OS(Str);
812 OS << "kill:";
813 for (unsigned i = 0, e = MI->getNumOperands(); i != e; ++i) {
814 const MachineOperand &Op = MI->getOperand(i);
815 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~++20200112100611+7fa5290d5bd/llvm/lib/CodeGen/AsmPrinter/AsmPrinter.cpp"
, 815, __PRETTY_FUNCTION__))
;
816 OS << ' ' << (Op.isDef() ? "def " : "killed ")
817 << printReg(Op.getReg(), AP.MF->getSubtarget().getRegisterInfo());
818 }
819 AP.OutStreamer->AddComment(OS.str());
820 AP.OutStreamer->AddBlankLine();
821}
822
823/// emitDebugValueComment - This method handles the target-independent form
824/// of DBG_VALUE, returning true if it was able to do so. A false return
825/// means the target will need to handle MI in EmitInstruction.
826static bool emitDebugValueComment(const MachineInstr *MI, AsmPrinter &AP) {
827 // This code handles only the 4-operand target-independent form.
828 if (MI->getNumOperands() != 4)
829 return false;
830
831 SmallString<128> Str;
832 raw_svector_ostream OS(Str);
833 OS << "DEBUG_VALUE: ";
834
835 const DILocalVariable *V = MI->getDebugVariable();
836 if (auto *SP = dyn_cast<DISubprogram>(V->getScope())) {
837 StringRef Name = SP->getName();
838 if (!Name.empty())
839 OS << Name << ":";
840 }
841 OS << V->getName();
842 OS << " <- ";
843
844 // The second operand is only an offset if it's an immediate.
845 bool MemLoc = MI->getOperand(0).isReg() && MI->getOperand(1).isImm();
846 int64_t Offset = MemLoc ? MI->getOperand(1).getImm() : 0;
847 const DIExpression *Expr = MI->getDebugExpression();
848 if (Expr->getNumElements()) {
849 OS << '[';
850 bool NeedSep = false;
851 for (auto Op : Expr->expr_ops()) {
852 if (NeedSep)
853 OS << ", ";
854 else
855 NeedSep = true;
856 OS << dwarf::OperationEncodingString(Op.getOp());
857 for (unsigned I = 0; I < Op.getNumArgs(); ++I)
858 OS << ' ' << Op.getArg(I);
859 }
860 OS << "] ";
861 }
862
863 // Register or immediate value. Register 0 means undef.
864 if (MI->getOperand(0).isFPImm()) {
865 APFloat APF = APFloat(MI->getOperand(0).getFPImm()->getValueAPF());
866 if (MI->getOperand(0).getFPImm()->getType()->isFloatTy()) {
867 OS << (double)APF.convertToFloat();
868 } else if (MI->getOperand(0).getFPImm()->getType()->isDoubleTy()) {
869 OS << APF.convertToDouble();
870 } else {
871 // There is no good way to print long double. Convert a copy to
872 // double. Ah well, it's only a comment.
873 bool ignored;
874 APF.convert(APFloat::IEEEdouble(), APFloat::rmNearestTiesToEven,
875 &ignored);
876 OS << "(long double) " << APF.convertToDouble();
877 }
878 } else if (MI->getOperand(0).isImm()) {
879 OS << MI->getOperand(0).getImm();
880 } else if (MI->getOperand(0).isCImm()) {
881 MI->getOperand(0).getCImm()->getValue().print(OS, false /*isSigned*/);
882 } else if (MI->getOperand(0).isTargetIndex()) {
883 auto Op = MI->getOperand(0);
884 OS << "!target-index(" << Op.getIndex() << "," << Op.getOffset() << ")";
885 return true;
886 } else {
887 unsigned Reg;
888 if (MI->getOperand(0).isReg()) {
889 Reg = MI->getOperand(0).getReg();
890 } else {
891 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~++20200112100611+7fa5290d5bd/llvm/lib/CodeGen/AsmPrinter/AsmPrinter.cpp"
, 891, __PRETTY_FUNCTION__))
;
892 const TargetFrameLowering *TFI = AP.MF->getSubtarget().getFrameLowering();
893 Offset += TFI->getFrameIndexReference(*AP.MF,
894 MI->getOperand(0).getIndex(), Reg);
895 MemLoc = true;
896 }
897 if (Reg == 0) {
898 // Suppress offset, it is not meaningful here.
899 OS << "undef";
900 // NOTE: Want this comment at start of line, don't emit with AddComment.
901 AP.OutStreamer->emitRawComment(OS.str());
902 return true;
903 }
904 if (MemLoc)
905 OS << '[';
906 OS << printReg(Reg, AP.MF->getSubtarget().getRegisterInfo());
907 }
908
909 if (MemLoc)
910 OS << '+' << Offset << ']';
911
912 // NOTE: Want this comment at start of line, don't emit with AddComment.
913 AP.OutStreamer->emitRawComment(OS.str());
914 return true;
915}
916
917/// This method handles the target-independent form of DBG_LABEL, returning
918/// true if it was able to do so. A false return means the target will need
919/// to handle MI in EmitInstruction.
920static bool emitDebugLabelComment(const MachineInstr *MI, AsmPrinter &AP) {
921 if (MI->getNumOperands() != 1)
922 return false;
923
924 SmallString<128> Str;
925 raw_svector_ostream OS(Str);
926 OS << "DEBUG_LABEL: ";
927
928 const DILabel *V = MI->getDebugLabel();
929 if (auto *SP = dyn_cast<DISubprogram>(
930 V->getScope()->getNonLexicalBlockFileScope())) {
931 StringRef Name = SP->getName();
932 if (!Name.empty())
933 OS << Name << ":";
934 }
935 OS << V->getName();
936
937 // NOTE: Want this comment at start of line, don't emit with AddComment.
938 AP.OutStreamer->emitRawComment(OS.str());
939 return true;
940}
941
942AsmPrinter::CFIMoveType AsmPrinter::needsCFIMoves() const {
943 if (MAI->getExceptionHandlingType() == ExceptionHandling::DwarfCFI &&
944 MF->getFunction().needsUnwindTableEntry())
945 return CFI_M_EH;
946
947 if (MMI->hasDebugInfo() || MF->getTarget().Options.ForceDwarfFrameSection)
948 return CFI_M_Debug;
949
950 return CFI_M_None;
951}
952
953bool AsmPrinter::needsSEHMoves() {
954 return MAI->usesWindowsCFI() && MF->getFunction().needsUnwindTableEntry();
955}
956
957void AsmPrinter::emitCFIInstruction(const MachineInstr &MI) {
958 ExceptionHandling ExceptionHandlingType = MAI->getExceptionHandlingType();
959 if (ExceptionHandlingType != ExceptionHandling::DwarfCFI &&
960 ExceptionHandlingType != ExceptionHandling::ARM)
961 return;
962
963 if (needsCFIMoves() == CFI_M_None)
964 return;
965
966 // If there is no "real" instruction following this CFI instruction, skip
967 // emitting it; it would be beyond the end of the function's FDE range.
968 auto *MBB = MI.getParent();
969 auto I = std::next(MI.getIterator());
970 while (I != MBB->end() && I->isTransient())
971 ++I;
972 if (I == MBB->instr_end() &&
973 MBB->getReverseIterator() == MBB->getParent()->rbegin())
974 return;
975
976 const std::vector<MCCFIInstruction> &Instrs = MF->getFrameInstructions();
977 unsigned CFIIndex = MI.getOperand(0).getCFIIndex();
978 const MCCFIInstruction &CFI = Instrs[CFIIndex];
979 emitCFIInstruction(CFI);
980}
981
982void AsmPrinter::emitFrameAlloc(const MachineInstr &MI) {
983 // The operands are the MCSymbol and the frame offset of the allocation.
984 MCSymbol *FrameAllocSym = MI.getOperand(0).getMCSymbol();
985 int FrameOffset = MI.getOperand(1).getImm();
986
987 // Emit a symbol assignment.
988 OutStreamer->EmitAssignment(FrameAllocSym,
989 MCConstantExpr::create(FrameOffset, OutContext));
990}
991
992void AsmPrinter::emitStackSizeSection(const MachineFunction &MF) {
993 if (!MF.getTarget().Options.EmitStackSizeSection)
994 return;
995
996 MCSection *StackSizeSection =
997 getObjFileLowering().getStackSizesSection(*getCurrentSection());
998 if (!StackSizeSection)
999 return;
1000
1001 const MachineFrameInfo &FrameInfo = MF.getFrameInfo();
1002 // Don't emit functions with dynamic stack allocations.
1003 if (FrameInfo.hasVarSizedObjects())
1004 return;
1005
1006 OutStreamer->PushSection();
1007 OutStreamer->SwitchSection(StackSizeSection);
1008
1009 const MCSymbol *FunctionSymbol = getFunctionBegin();
1010 uint64_t StackSize = FrameInfo.getStackSize();
1011 OutStreamer->EmitSymbolValue(FunctionSymbol, TM.getProgramPointerSize());
1012 OutStreamer->EmitULEB128IntValue(StackSize);
1013
1014 OutStreamer->PopSection();
1015}
1016
1017static bool needFuncLabelsForEHOrDebugInfo(const MachineFunction &MF,
1018 MachineModuleInfo *MMI) {
1019 if (!MF.getLandingPads().empty() || MF.hasEHFunclets() || MMI->hasDebugInfo())
1020 return true;
1021
1022 // We might emit an EH table that uses function begin and end labels even if
1023 // we don't have any landingpads.
1024 if (!MF.getFunction().hasPersonalityFn())
1025 return false;
1026 return !isNoOpWithoutInvoke(
1027 classifyEHPersonality(MF.getFunction().getPersonalityFn()));
1028}
1029
1030/// EmitFunctionBody - This method emits the body and trailer for a
1031/// function.
1032void AsmPrinter::EmitFunctionBody() {
1033 EmitFunctionHeader();
1034
1035 // Emit target-specific gunk before the function body.
1036 EmitFunctionBodyStart();
1037
1038 bool ShouldPrintDebugScopes = MMI->hasDebugInfo();
1039
1040 if (isVerbose()) {
1041 // Get MachineDominatorTree or compute it on the fly if it's unavailable
1042 MDT = getAnalysisIfAvailable<MachineDominatorTree>();
1043 if (!MDT) {
1044 OwnedMDT = std::make_unique<MachineDominatorTree>();
1045 OwnedMDT->getBase().recalculate(*MF);
1046 MDT = OwnedMDT.get();
1047 }
1048
1049 // Get MachineLoopInfo or compute it on the fly if it's unavailable
1050 MLI = getAnalysisIfAvailable<MachineLoopInfo>();
1051 if (!MLI) {
1052 OwnedMLI = std::make_unique<MachineLoopInfo>();
1053 OwnedMLI->getBase().analyze(MDT->getBase());
1054 MLI = OwnedMLI.get();
1055 }
1056 }
1057
1058 // Print out code for the function.
1059 bool HasAnyRealCode = false;
1060 int NumInstsInFunction = 0;
1061 for (auto &MBB : *MF) {
1062 // Print a label for the basic block.
1063 EmitBasicBlockStart(MBB);
1064 for (auto &MI : MBB) {
1065 // Print the assembly for the instruction.
1066 if (!MI.isPosition() && !MI.isImplicitDef() && !MI.isKill() &&
1067 !MI.isDebugInstr()) {
1068 HasAnyRealCode = true;
1069 ++NumInstsInFunction;
1070 }
1071
1072 // If there is a pre-instruction symbol, emit a label for it here.
1073 if (MCSymbol *S = MI.getPreInstrSymbol())
1074 OutStreamer->EmitLabel(S);
1075
1076 if (ShouldPrintDebugScopes) {
1077 for (const HandlerInfo &HI : Handlers) {
1078 NamedRegionTimer T(HI.TimerName, HI.TimerDescription,
1079 HI.TimerGroupName, HI.TimerGroupDescription,
1080 TimePassesIsEnabled);
1081 HI.Handler->beginInstruction(&MI);
1082 }
1083 }
1084
1085 if (isVerbose())
1086 emitComments(MI, OutStreamer->GetCommentOS());
1087
1088 switch (MI.getOpcode()) {
1089 case TargetOpcode::CFI_INSTRUCTION:
1090 emitCFIInstruction(MI);
1091 break;
1092 case TargetOpcode::LOCAL_ESCAPE:
1093 emitFrameAlloc(MI);
1094 break;
1095 case TargetOpcode::ANNOTATION_LABEL:
1096 case TargetOpcode::EH_LABEL:
1097 case TargetOpcode::GC_LABEL:
1098 OutStreamer->EmitLabel(MI.getOperand(0).getMCSymbol());
1099 break;
1100 case TargetOpcode::INLINEASM:
1101 case TargetOpcode::INLINEASM_BR:
1102 EmitInlineAsm(&MI);
1103 break;
1104 case TargetOpcode::DBG_VALUE:
1105 if (isVerbose()) {
1106 if (!emitDebugValueComment(&MI, *this))
1107 EmitInstruction(&MI);
1108 }
1109 break;
1110 case TargetOpcode::DBG_LABEL:
1111 if (isVerbose()) {
1112 if (!emitDebugLabelComment(&MI, *this))
1113 EmitInstruction(&MI);
1114 }
1115 break;
1116 case TargetOpcode::IMPLICIT_DEF:
1117 if (isVerbose()) emitImplicitDef(&MI);
1118 break;
1119 case TargetOpcode::KILL:
1120 if (isVerbose()) emitKill(&MI, *this);
1121 break;
1122 default:
1123 EmitInstruction(&MI);
1124 break;
1125 }
1126
1127 // If there is a post-instruction symbol, emit a label for it here.
1128 if (MCSymbol *S = MI.getPostInstrSymbol())
1129 OutStreamer->EmitLabel(S);
1130
1131 if (ShouldPrintDebugScopes) {
1132 for (const HandlerInfo &HI : Handlers) {
1133 NamedRegionTimer T(HI.TimerName, HI.TimerDescription,
1134 HI.TimerGroupName, HI.TimerGroupDescription,
1135 TimePassesIsEnabled);
1136 HI.Handler->endInstruction();
1137 }
1138 }
1139 }
1140
1141 EmitBasicBlockEnd(MBB);
1142 }
1143
1144 EmittedInsts += NumInstsInFunction;
1145 MachineOptimizationRemarkAnalysis R(DEBUG_TYPE"asm-printer", "InstructionCount",
1146 MF->getFunction().getSubprogram(),
1147 &MF->front());
1148 R << ore::NV("NumInstructions", NumInstsInFunction)
1149 << " instructions in function";
1150 ORE->emit(R);
1151
1152 // If the function is empty and the object file uses .subsections_via_symbols,
1153 // then we need to emit *something* to the function body to prevent the
1154 // labels from collapsing together. Just emit a noop.
1155 // Similarly, don't emit empty functions on Windows either. It can lead to
1156 // duplicate entries (two functions with the same RVA) in the Guard CF Table
1157 // after linking, causing the kernel not to load the binary:
1158 // https://developercommunity.visualstudio.com/content/problem/45366/vc-linker-creates-invalid-dll-with-clang-cl.html
1159 // FIXME: Hide this behind some API in e.g. MCAsmInfo or MCTargetStreamer.
1160 const Triple &TT = TM.getTargetTriple();
1161 if (!HasAnyRealCode && (MAI->hasSubsectionsViaSymbols() ||
1162 (TT.isOSWindows() && TT.isOSBinFormatCOFF()))) {
1163 MCInst Noop;
1164 MF->getSubtarget().getInstrInfo()->getNoop(Noop);
1165
1166 // Targets can opt-out of emitting the noop here by leaving the opcode
1167 // unspecified.
1168 if (Noop.getOpcode()) {
1169 OutStreamer->AddComment("avoids zero-length function");
1170 OutStreamer->EmitInstruction(Noop, getSubtargetInfo());
1171 }
1172 }
1173
1174 const Function &F = MF->getFunction();
1175 for (const auto &BB : F) {
1176 if (!BB.hasAddressTaken())
1177 continue;
1178 MCSymbol *Sym = GetBlockAddressSymbol(&BB);
1179 if (Sym->isDefined())
1180 continue;
1181 OutStreamer->AddComment("Address of block that was removed by CodeGen");
1182 OutStreamer->EmitLabel(Sym);
1183 }
1184
1185 // Emit target-specific gunk after the function body.
1186 EmitFunctionBodyEnd();
1187
1188 if (needFuncLabelsForEHOrDebugInfo(*MF, MMI) ||
1189 MAI->hasDotTypeDotSizeDirective()) {
1190 // Create a symbol for the end of function.
1191 CurrentFnEnd = createTempSymbol("func_end");
1192 OutStreamer->EmitLabel(CurrentFnEnd);
1193 }
1194
1195 // If the target wants a .size directive for the size of the function, emit
1196 // it.
1197 if (MAI->hasDotTypeDotSizeDirective()) {
1198 // We can get the size as difference between the function label and the
1199 // temp label.
1200 const MCExpr *SizeExp = MCBinaryExpr::createSub(
1201 MCSymbolRefExpr::create(CurrentFnEnd, OutContext),
1202 MCSymbolRefExpr::create(CurrentFnSymForSize, OutContext), OutContext);
1203 OutStreamer->emitELFSize(CurrentFnSym, SizeExp);
1204 }
1205
1206 for (const HandlerInfo &HI : Handlers) {
1207 NamedRegionTimer T(HI.TimerName, HI.TimerDescription, HI.TimerGroupName,
1208 HI.TimerGroupDescription, TimePassesIsEnabled);
1209 HI.Handler->markFunctionEnd();
1210 }
1211
1212 // Print out jump tables referenced by the function.
1213 EmitJumpTableInfo();
1214
1215 // Emit post-function debug and/or EH information.
1216 for (const HandlerInfo &HI : Handlers) {
1217 NamedRegionTimer T(HI.TimerName, HI.TimerDescription, HI.TimerGroupName,
1218 HI.TimerGroupDescription, TimePassesIsEnabled);
1219 HI.Handler->endFunction(MF);
1220 }
1221
1222 // Emit section containing stack size metadata.
1223 emitStackSizeSection(*MF);
1224
1225 emitPatchableFunctionEntries();
1226
1227 if (isVerbose())
1228 OutStreamer->GetCommentOS() << "-- End function\n";
1229
1230 OutStreamer->AddBlankLine();
1231}
1232
1233/// Compute the number of Global Variables that uses a Constant.
1234static unsigned getNumGlobalVariableUses(const Constant *C) {
1235 if (!C)
1236 return 0;
1237
1238 if (isa<GlobalVariable>(C))
1239 return 1;
1240
1241 unsigned NumUses = 0;
1242 for (auto *CU : C->users())
1243 NumUses += getNumGlobalVariableUses(dyn_cast<Constant>(CU));
1244
1245 return NumUses;
1246}
1247
1248/// Only consider global GOT equivalents if at least one user is a
1249/// cstexpr inside an initializer of another global variables. Also, don't
1250/// handle cstexpr inside instructions. During global variable emission,
1251/// candidates are skipped and are emitted later in case at least one cstexpr
1252/// isn't replaced by a PC relative GOT entry access.
1253static bool isGOTEquivalentCandidate(const GlobalVariable *GV,
1254 unsigned &NumGOTEquivUsers) {
1255 // Global GOT equivalents are unnamed private globals with a constant
1256 // pointer initializer to another global symbol. They must point to a
1257 // GlobalVariable or Function, i.e., as GlobalValue.
1258 if (!GV->hasGlobalUnnamedAddr() || !GV->hasInitializer() ||
1259 !GV->isConstant() || !GV->isDiscardableIfUnused() ||
1260 !isa<GlobalValue>(GV->getOperand(0)))
1261 return false;
1262
1263 // To be a got equivalent, at least one of its users need to be a constant
1264 // expression used by another global variable.
1265 for (auto *U : GV->users())
1266 NumGOTEquivUsers += getNumGlobalVariableUses(dyn_cast<Constant>(U));
1267
1268 return NumGOTEquivUsers > 0;
1269}
1270
1271/// Unnamed constant global variables solely contaning a pointer to
1272/// another globals variable is equivalent to a GOT table entry; it contains the
1273/// the address of another symbol. Optimize it and replace accesses to these
1274/// "GOT equivalents" by using the GOT entry for the final global instead.
1275/// Compute GOT equivalent candidates among all global variables to avoid
1276/// emitting them if possible later on, after it use is replaced by a GOT entry
1277/// access.
1278void AsmPrinter::computeGlobalGOTEquivs(Module &M) {
1279 if (!getObjFileLowering().supportIndirectSymViaGOTPCRel())
1280 return;
1281
1282 for (const auto &G : M.globals()) {
1283 unsigned NumGOTEquivUsers = 0;
1284 if (!isGOTEquivalentCandidate(&G, NumGOTEquivUsers))
1285 continue;
1286
1287 const MCSymbol *GOTEquivSym = getSymbol(&G);
1288 GlobalGOTEquivs[GOTEquivSym] = std::make_pair(&G, NumGOTEquivUsers);
1289 }
1290}
1291
1292/// Constant expressions using GOT equivalent globals may not be eligible
1293/// for PC relative GOT entry conversion, in such cases we need to emit such
1294/// globals we previously omitted in EmitGlobalVariable.
1295void AsmPrinter::emitGlobalGOTEquivs() {
1296 if (!getObjFileLowering().supportIndirectSymViaGOTPCRel())
1297 return;
1298
1299 SmallVector<const GlobalVariable *, 8> FailedCandidates;
1300 for (auto &I : GlobalGOTEquivs) {
1301 const GlobalVariable *GV = I.second.first;
1302 unsigned Cnt = I.second.second;
1303 if (Cnt)
1304 FailedCandidates.push_back(GV);
1305 }
1306 GlobalGOTEquivs.clear();
1307
1308 for (auto *GV : FailedCandidates)
1309 EmitGlobalVariable(GV);
1310}
1311
1312void AsmPrinter::emitGlobalIndirectSymbol(Module &M,
1313 const GlobalIndirectSymbol& GIS) {
1314 MCSymbol *Name = getSymbol(&GIS);
1315
1316 if (GIS.hasExternalLinkage() || !MAI->getWeakRefDirective())
1317 OutStreamer->EmitSymbolAttribute(Name, MCSA_Global);
1318 else if (GIS.hasWeakLinkage() || GIS.hasLinkOnceLinkage())
1319 OutStreamer->EmitSymbolAttribute(Name, MCSA_WeakReference);
1320 else
1321 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~++20200112100611+7fa5290d5bd/llvm/lib/CodeGen/AsmPrinter/AsmPrinter.cpp"
, 1321, __PRETTY_FUNCTION__))
;
1322
1323 bool IsFunction = GIS.getValueType()->isFunctionTy();
1324
1325 // Treat bitcasts of functions as functions also. This is important at least
1326 // on WebAssembly where object and function addresses can't alias each other.
1327 if (!IsFunction)
1328 if (auto *CE = dyn_cast<ConstantExpr>(GIS.getIndirectSymbol()))
1329 if (CE->getOpcode() == Instruction::BitCast)
1330 IsFunction =
1331 CE->getOperand(0)->getType()->getPointerElementType()->isFunctionTy();
1332
1333 // Set the symbol type to function if the alias has a function type.
1334 // This affects codegen when the aliasee is not a function.
1335 if (IsFunction)
1336 OutStreamer->EmitSymbolAttribute(Name, isa<GlobalIFunc>(GIS)
1337 ? MCSA_ELF_TypeIndFunction
1338 : MCSA_ELF_TypeFunction);
1339
1340 EmitVisibility(Name, GIS.getVisibility());
1341
1342 const MCExpr *Expr = lowerConstant(GIS.getIndirectSymbol());
1343
1344 if (isa<GlobalAlias>(&GIS) && MAI->hasAltEntry() && isa<MCBinaryExpr>(Expr))
1345 OutStreamer->EmitSymbolAttribute(Name, MCSA_AltEntry);
1346
1347 // Emit the directives as assignments aka .set:
1348 OutStreamer->EmitAssignment(Name, Expr);
1349
1350 if (auto *GA = dyn_cast<GlobalAlias>(&GIS)) {
1351 // If the aliasee does not correspond to a symbol in the output, i.e. the
1352 // alias is not of an object or the aliased object is private, then set the
1353 // size of the alias symbol from the type of the alias. We don't do this in
1354 // other situations as the alias and aliasee having differing types but same
1355 // size may be intentional.
1356 const GlobalObject *BaseObject = GA->getBaseObject();
1357 if (MAI->hasDotTypeDotSizeDirective() && GA->getValueType()->isSized() &&
1358 (!BaseObject || BaseObject->hasPrivateLinkage())) {
1359 const DataLayout &DL = M.getDataLayout();
1360 uint64_t Size = DL.getTypeAllocSize(GA->getValueType());
1361 OutStreamer->emitELFSize(Name, MCConstantExpr::create(Size, OutContext));
1362 }
1363 }
1364}
1365
1366void AsmPrinter::emitRemarksSection(RemarkStreamer &RS) {
1367 if (!RS.needsSection())
1368 return;
1369
1370 remarks::RemarkSerializer &RemarkSerializer = RS.getSerializer();
1371
1372 Optional<SmallString<128>> Filename;
1373 if (Optional<StringRef> FilenameRef = RS.getFilename()) {
1374 Filename = *FilenameRef;
1375 sys::fs::make_absolute(*Filename);
1376 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~++20200112100611+7fa5290d5bd/llvm/lib/CodeGen/AsmPrinter/AsmPrinter.cpp"
, 1376, __PRETTY_FUNCTION__))
;
1377 }
1378
1379 std::string Buf;
1380 raw_string_ostream OS(Buf);
1381 std::unique_ptr<remarks::MetaSerializer> MetaSerializer =
1382 Filename ? RemarkSerializer.metaSerializer(OS, StringRef(*Filename))
1383 : RemarkSerializer.metaSerializer(OS);
1384 MetaSerializer->emit();
1385
1386 // Switch to the remarks section.
1387 MCSection *RemarksSection =
1388 OutContext.getObjectFileInfo()->getRemarksSection();
1389 OutStreamer->SwitchSection(RemarksSection);
1390
1391 OutStreamer->EmitBinaryData(OS.str());
1392}
1393
1394bool AsmPrinter::doFinalization(Module &M) {
1395 // Set the MachineFunction to nullptr so that we can catch attempted
1396 // accesses to MF specific features at the module level and so that
1397 // we can conditionalize accesses based on whether or not it is nullptr.
1398 MF = nullptr;
1399
1400 // Gather all GOT equivalent globals in the module. We really need two
1401 // passes over the globals: one to compute and another to avoid its emission
1402 // in EmitGlobalVariable, otherwise we would not be able to handle cases
1403 // where the got equivalent shows up before its use.
1404 computeGlobalGOTEquivs(M);
1405
1406 // Emit global variables.
1407 for (const auto &G : M.globals())
1408 EmitGlobalVariable(&G);
1409
1410 // Emit remaining GOT equivalent globals.
1411 emitGlobalGOTEquivs();
1412
1413 // Emit visibility info for declarations
1414 for (const Function &F : M) {
1415 if (!F.isDeclarationForLinker())
1416 continue;
1417 GlobalValue::VisibilityTypes V = F.getVisibility();
1418 if (V == GlobalValue::DefaultVisibility)
1419 continue;
1420
1421 MCSymbol *Name = getSymbol(&F);
1422 EmitVisibility(Name, V, false);
1423 }
1424
1425 // Emit the remarks section contents.
1426 // FIXME: Figure out when is the safest time to emit this section. It should
1427 // not come after debug info.
1428 if (RemarkStreamer *RS = M.getContext().getRemarkStreamer())
1429 emitRemarksSection(*RS);
1430
1431 const TargetLoweringObjectFile &TLOF = getObjFileLowering();
1432
1433 TLOF.emitModuleMetadata(*OutStreamer, M);
1434
1435 if (TM.getTargetTriple().isOSBinFormatELF()) {
1436 MachineModuleInfoELF &MMIELF = MMI->getObjFileInfo<MachineModuleInfoELF>();
1437
1438 // Output stubs for external and common global variables.
1439 MachineModuleInfoELF::SymbolListTy Stubs = MMIELF.GetGVStubList();
1440 if (!Stubs.empty()) {
1441 OutStreamer->SwitchSection(TLOF.getDataSection());
1442 const DataLayout &DL = M.getDataLayout();
1443
1444 EmitAlignment(Align(DL.getPointerSize()));
1445 for (const auto &Stub : Stubs) {
1446 OutStreamer->EmitLabel(Stub.first);
1447 OutStreamer->EmitSymbolValue(Stub.second.getPointer(),
1448 DL.getPointerSize());
1449 }
1450 }
1451 }
1452
1453 if (TM.getTargetTriple().isOSBinFormatCOFF()) {
1454 MachineModuleInfoCOFF &MMICOFF =
1455 MMI->getObjFileInfo<MachineModuleInfoCOFF>();
1456
1457 // Output stubs for external and common global variables.
1458 MachineModuleInfoCOFF::SymbolListTy Stubs = MMICOFF.GetGVStubList();
1459 if (!Stubs.empty()) {
1460 const DataLayout &DL = M.getDataLayout();
1461
1462 for (const auto &Stub : Stubs) {
1463 SmallString<256> SectionName = StringRef(".rdata$");
1464 SectionName += Stub.first->getName();
1465 OutStreamer->SwitchSection(OutContext.getCOFFSection(
1466 SectionName,
1467 COFF::IMAGE_SCN_CNT_INITIALIZED_DATA | COFF::IMAGE_SCN_MEM_READ |
1468 COFF::IMAGE_SCN_LNK_COMDAT,
1469 SectionKind::getReadOnly(), Stub.first->getName(),
1470 COFF::IMAGE_COMDAT_SELECT_ANY));
1471 EmitAlignment(Align(DL.getPointerSize()));
1472 OutStreamer->EmitSymbolAttribute(Stub.first, MCSA_Global);
1473 OutStreamer->EmitLabel(Stub.first);
1474 OutStreamer->EmitSymbolValue(Stub.second.getPointer(),
1475 DL.getPointerSize());
1476 }
1477 }
1478 }
1479
1480 // Finalize debug and EH information.
1481 for (const HandlerInfo &HI : Handlers) {
1482 NamedRegionTimer T(HI.TimerName, HI.TimerDescription, HI.TimerGroupName,
1483 HI.TimerGroupDescription, TimePassesIsEnabled);
1484 HI.Handler->endModule();
1485 }
1486 Handlers.clear();
1487 DD = nullptr;
1488
1489 // If the target wants to know about weak references, print them all.
1490 if (MAI->getWeakRefDirective()) {
1491 // FIXME: This is not lazy, it would be nice to only print weak references
1492 // to stuff that is actually used. Note that doing so would require targets
1493 // to notice uses in operands (due to constant exprs etc). This should
1494 // happen with the MC stuff eventually.
1495
1496 // Print out module-level global objects here.
1497 for (const auto &GO : M.global_objects()) {
1498 if (!GO.hasExternalWeakLinkage())
1499 continue;
1500 OutStreamer->EmitSymbolAttribute(getSymbol(&GO), MCSA_WeakReference);
1501 }
1502 }
1503
1504 // Print aliases in topological order, that is, for each alias a = b,
1505 // b must be printed before a.
1506 // This is because on some targets (e.g. PowerPC) linker expects aliases in
1507 // such an order to generate correct TOC information.
1508 SmallVector<const GlobalAlias *, 16> AliasStack;
1509 SmallPtrSet<const GlobalAlias *, 16> AliasVisited;
1510 for (const auto &Alias : M.aliases()) {
1511 for (const GlobalAlias *Cur = &Alias; Cur;
1512 Cur = dyn_cast<GlobalAlias>(Cur->getAliasee())) {
1513 if (!AliasVisited.insert(Cur).second)
1514 break;
1515 AliasStack.push_back(Cur);
1516 }
1517 for (const GlobalAlias *AncestorAlias : llvm::reverse(AliasStack))
1518 emitGlobalIndirectSymbol(M, *AncestorAlias);
1519 AliasStack.clear();
1520 }
1521 for (const auto &IFunc : M.ifuncs())
1522 emitGlobalIndirectSymbol(M, IFunc);
1523
1524 GCModuleInfo *MI = getAnalysisIfAvailable<GCModuleInfo>();
1525 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~++20200112100611+7fa5290d5bd/llvm/lib/CodeGen/AsmPrinter/AsmPrinter.cpp"
, 1525, __PRETTY_FUNCTION__))
;
1526 for (GCModuleInfo::iterator I = MI->end(), E = MI->begin(); I != E; )
1527 if (GCMetadataPrinter *MP = GetOrCreateGCPrinter(**--I))
1528 MP->finishAssembly(M, *MI, *this);
1529
1530 // Emit llvm.ident metadata in an '.ident' directive.
1531 EmitModuleIdents(M);
1532
1533 // Emit bytes for llvm.commandline metadata.
1534 EmitModuleCommandLines(M);
1535
1536 // Emit __morestack address if needed for indirect calls.
1537 if (MMI->usesMorestackAddr()) {
1538 unsigned Align = 1;
1539 MCSection *ReadOnlySection = getObjFileLowering().getSectionForConstant(
1540 getDataLayout(), SectionKind::getReadOnly(),
1541 /*C=*/nullptr, Align);
1542 OutStreamer->SwitchSection(ReadOnlySection);
1543
1544 MCSymbol *AddrSymbol =
1545 OutContext.getOrCreateSymbol(StringRef("__morestack_addr"));
1546 OutStreamer->EmitLabel(AddrSymbol);
1547
1548 unsigned PtrSize = MAI->getCodePointerSize();
1549 OutStreamer->EmitSymbolValue(GetExternalSymbolSymbol("__morestack"),
1550 PtrSize);
1551 }
1552
1553 // Emit .note.GNU-split-stack and .note.GNU-no-split-stack sections if
1554 // split-stack is used.
1555 if (TM.getTargetTriple().isOSBinFormatELF() && MMI->hasSplitStack()) {
1556 OutStreamer->SwitchSection(
1557 OutContext.getELFSection(".note.GNU-split-stack", ELF::SHT_PROGBITS, 0));
1558 if (MMI->hasNosplitStack())
1559 OutStreamer->SwitchSection(
1560 OutContext.getELFSection(".note.GNU-no-split-stack", ELF::SHT_PROGBITS, 0));
1561 }
1562
1563 // If we don't have any trampolines, then we don't require stack memory
1564 // to be executable. Some targets have a directive to declare this.
1565 Function *InitTrampolineIntrinsic = M.getFunction("llvm.init.trampoline");
1566 if (!InitTrampolineIntrinsic || InitTrampolineIntrinsic->use_empty())
1567 if (MCSection *S = MAI->getNonexecutableStackSection(OutContext))
1568 OutStreamer->SwitchSection(S);
1569
1570 if (TM.getTargetTriple().isOSBinFormatCOFF()) {
1571 // Emit /EXPORT: flags for each exported global as necessary.
1572 const auto &TLOF = getObjFileLowering();
1573 std::string Flags;
1574
1575 for (const GlobalValue &GV : M.global_values()) {
1576 raw_string_ostream OS(Flags);
1577 TLOF.emitLinkerFlagsForGlobal(OS, &GV);
1578 OS.flush();
1579 if (!Flags.empty()) {
1580 OutStreamer->SwitchSection(TLOF.getDrectveSection());
1581 OutStreamer->EmitBytes(Flags);
1582 }
1583 Flags.clear();
1584 }
1585
1586 // Emit /INCLUDE: flags for each used global as necessary.
1587 if (const auto *LU = M.getNamedGlobal("llvm.used")) {
1588 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~++20200112100611+7fa5290d5bd/llvm/lib/CodeGen/AsmPrinter/AsmPrinter.cpp"
, 1589, __PRETTY_FUNCTION__))
1589 "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~++20200112100611+7fa5290d5bd/llvm/lib/CodeGen/AsmPrinter/AsmPrinter.cpp"
, 1589, __PRETTY_FUNCTION__))
;
1590 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~++20200112100611+7fa5290d5bd/llvm/lib/CodeGen/AsmPrinter/AsmPrinter.cpp"
, 1591, __PRETTY_FUNCTION__))
1591 "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~++20200112100611+7fa5290d5bd/llvm/lib/CodeGen/AsmPrinter/AsmPrinter.cpp"
, 1591, __PRETTY_FUNCTION__))
;
1592 if (const auto *A = cast<ConstantArray>(LU->getInitializer())) {
1593 for (const Value *Op : A->operands()) {
1594 const auto *GV = cast<GlobalValue>(Op->stripPointerCasts());
1595 // Global symbols with internal or private linkage are not visible to
1596 // the linker, and thus would cause an error when the linker tried to
1597 // preserve the symbol due to the `/include:` directive.
1598 if (GV->hasLocalLinkage())
1599 continue;
1600
1601 raw_string_ostream OS(Flags);
1602 TLOF.emitLinkerFlagsForUsed(OS, GV);
1603 OS.flush();
1604
1605 if (!Flags.empty()) {
1606 OutStreamer->SwitchSection(TLOF.getDrectveSection());
1607 OutStreamer->EmitBytes(Flags);
1608 }
1609 Flags.clear();
1610 }
1611 }
1612 }
1613 }
1614
1615 if (TM.Options.EmitAddrsig) {
1616 // Emit address-significance attributes for all globals.
1617 OutStreamer->EmitAddrsig();
1618 for (const GlobalValue &GV : M.global_values())
1619 if (!GV.use_empty() && !GV.isThreadLocal() &&
1620 !GV.hasDLLImportStorageClass() && !GV.getName().startswith("llvm.") &&
1621 !GV.hasAtLeastLocalUnnamedAddr())
1622 OutStreamer->EmitAddrsigSym(getSymbol(&GV));
1623 }
1624
1625 // Emit symbol partition specifications (ELF only).
1626 if (TM.getTargetTriple().isOSBinFormatELF()) {
1627 unsigned UniqueID = 0;
1628 for (const GlobalValue &GV : M.global_values()) {
1629 if (!GV.hasPartition() || GV.isDeclarationForLinker() ||
1630 GV.getVisibility() != GlobalValue::DefaultVisibility)
1631 continue;
1632
1633 OutStreamer->SwitchSection(OutContext.getELFSection(
1634 ".llvm_sympart", ELF::SHT_LLVM_SYMPART, 0, 0, "", ++UniqueID));
1635 OutStreamer->EmitBytes(GV.getPartition());
1636 OutStreamer->EmitZeros(1);
1637 OutStreamer->EmitValue(
1638 MCSymbolRefExpr::create(getSymbol(&GV), OutContext),
1639 MAI->getCodePointerSize());
1640 }
1641 }
1642
1643 // Allow the target to emit any magic that it wants at the end of the file,
1644 // after everything else has gone out.
1645 EmitEndOfAsmFile(M);
1646
1647 MMI = nullptr;
1648
1649 OutStreamer->Finish();
1650 OutStreamer->reset();
1651 OwnedMLI.reset();
1652 OwnedMDT.reset();
1653
1654 return false;
1655}
1656
1657MCSymbol *AsmPrinter::getCurExceptionSym() {
1658 if (!CurExceptionSym)
1659 CurExceptionSym = createTempSymbol("exception");
1660 return CurExceptionSym;
1661}
1662
1663void AsmPrinter::SetupMachineFunction(MachineFunction &MF) {
1664 this->MF = &MF;
1665 const Function &F = MF.getFunction();
1666
1667 // Get the function symbol.
1668 if (MAI->needsFunctionDescriptors()) {
1669 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~++20200112100611+7fa5290d5bd/llvm/lib/CodeGen/AsmPrinter/AsmPrinter.cpp"
, 1670, __PRETTY_FUNCTION__))
1670 " 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~++20200112100611+7fa5290d5bd/llvm/lib/CodeGen/AsmPrinter/AsmPrinter.cpp"
, 1670, __PRETTY_FUNCTION__))
;
1671 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~++20200112100611+7fa5290d5bd/llvm/lib/CodeGen/AsmPrinter/AsmPrinter.cpp"
, 1672, __PRETTY_FUNCTION__))
1672 " 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~++20200112100611+7fa5290d5bd/llvm/lib/CodeGen/AsmPrinter/AsmPrinter.cpp"
, 1672, __PRETTY_FUNCTION__))
;
1673
1674 // Get the function entry point symbol.
1675 CurrentFnSym =
1676 OutContext.getOrCreateSymbol("." + CurrentFnDescSym->getName());
1677
1678 MCSectionXCOFF *FnEntryPointSec =
1679 cast<MCSectionXCOFF>(getObjFileLowering().SectionForGlobal(&F, TM));
1680 // Set the containing csect.
1681 cast<MCSymbolXCOFF>(CurrentFnSym)->setContainingCsect(FnEntryPointSec);
1682 } else {
1683 CurrentFnSym = getSymbol(&MF.getFunction());
1684 }
1685
1686 CurrentFnSymForSize = CurrentFnSym;
1687 CurrentFnBegin = nullptr;
1688 CurExceptionSym = nullptr;
1689 bool NeedsLocalForSize = MAI->needsLocalForSize();
1690 if (F.hasFnAttribute("patchable-function-entry") ||
1691 needFuncLabelsForEHOrDebugInfo(MF, MMI) || NeedsLocalForSize ||
1692 MF.getTarget().Options.EmitStackSizeSection) {
1693 CurrentFnBegin = createTempSymbol("func_begin");
1694 if (NeedsLocalForSize)
1695 CurrentFnSymForSize = CurrentFnBegin;
1696 }
1697
1698 ORE = &getAnalysis<MachineOptimizationRemarkEmitterPass>().getORE();
1699 PSI = &getAnalysis<ProfileSummaryInfoWrapperPass>().getPSI();
1700 MBFI = (PSI && PSI->hasProfileSummary()) ?
1701 // ORE conditionally computes MBFI. If available, use it, otherwise
1702 // request it.
1703 (ORE->getBFI() ? ORE->getBFI() :
1704 &getAnalysis<LazyMachineBlockFrequencyInfoPass>().getBFI()) :
1705 nullptr;
1706}
1707
1708namespace {
1709
1710// Keep track the alignment, constpool entries per Section.
1711 struct SectionCPs {
1712 MCSection *S;
1713 unsigned Alignment;
1714 SmallVector<unsigned, 4> CPEs;
1715
1716 SectionCPs(MCSection *s, unsigned a) : S(s), Alignment(a) {}
1717 };
1718
1719} // end anonymous namespace
1720
1721/// EmitConstantPool - Print to the current output stream assembly
1722/// representations of the constants in the constant pool MCP. This is
1723/// used to print out constants which have been "spilled to memory" by
1724/// the code generator.
1725void AsmPrinter::EmitConstantPool() {
1726 const MachineConstantPool *MCP = MF->getConstantPool();
1727 const std::vector<MachineConstantPoolEntry> &CP = MCP->getConstants();
1728 if (CP.empty()) return;
1729
1730 // Calculate sections for constant pool entries. We collect entries to go into
1731 // the same section together to reduce amount of section switch statements.
1732 SmallVector<SectionCPs, 4> CPSections;
1733 for (unsigned i = 0, e = CP.size(); i != e; ++i) {
1734 const MachineConstantPoolEntry &CPE = CP[i];
1735 unsigned Align = CPE.getAlignment();
1736
1737 SectionKind Kind = CPE.getSectionKind(&getDataLayout());
1738
1739 const Constant *C = nullptr;
1740 if (!CPE.isMachineConstantPoolEntry())
1741 C = CPE.Val.ConstVal;
1742
1743 MCSection *S = getObjFileLowering().getSectionForConstant(getDataLayout(),
1744 Kind, C, Align);
1745
1746 // The number of sections are small, just do a linear search from the
1747 // last section to the first.
1748 bool Found = false;
1749 unsigned SecIdx = CPSections.size();
1750 while (SecIdx != 0) {
1751 if (CPSections[--SecIdx].S == S) {
1752 Found = true;
1753 break;
1754 }
1755 }
1756 if (!Found) {
1757 SecIdx = CPSections.size();
1758 CPSections.push_back(SectionCPs(S, Align));
1759 }
1760
1761 if (Align > CPSections[SecIdx].Alignment)
1762 CPSections[SecIdx].Alignment = Align;
1763 CPSections[SecIdx].CPEs.push_back(i);
1764 }
1765
1766 // Now print stuff into the calculated sections.
1767 const MCSection *CurSection = nullptr;
1768 unsigned Offset = 0;
1769 for (unsigned i = 0, e = CPSections.size(); i != e; ++i) {
1770 for (unsigned j = 0, ee = CPSections[i].CPEs.size(); j != ee; ++j) {
1771 unsigned CPI = CPSections[i].CPEs[j];
1772 MCSymbol *Sym = GetCPISymbol(CPI);
1773 if (!Sym->isUndefined())
1774 continue;
1775
1776 if (TM.getTargetTriple().isOSBinFormatXCOFF()) {
1777 cast<MCSymbolXCOFF>(Sym)->setContainingCsect(
1778 cast<MCSectionXCOFF>(CPSections[i].S));
1779 }
1780
1781 if (CurSection != CPSections[i].S) {
1782 OutStreamer->SwitchSection(CPSections[i].S);
1783 EmitAlignment(Align(CPSections[i].Alignment));
1784 CurSection = CPSections[i].S;
1785 Offset = 0;
1786 }
1787
1788 MachineConstantPoolEntry CPE = CP[CPI];
1789
1790 // Emit inter-object padding for alignment.
1791 unsigned AlignMask = CPE.getAlignment() - 1;
1792 unsigned NewOffset = (Offset + AlignMask) & ~AlignMask;
1793 OutStreamer->EmitZeros(NewOffset - Offset);
1794
1795 Type *Ty = CPE.getType();
1796 Offset = NewOffset + getDataLayout().getTypeAllocSize(Ty);
1797
1798 OutStreamer->EmitLabel(Sym);
1799 if (CPE.isMachineConstantPoolEntry())
1800 EmitMachineConstantPoolValue(CPE.Val.MachineCPVal);
1801 else
1802 EmitGlobalConstant(getDataLayout(), CPE.Val.ConstVal);
1803 }
1804 }
1805}
1806
1807/// EmitJumpTableInfo - Print assembly representations of the jump tables used
1808/// by the current function to the current output stream.
1809void AsmPrinter::EmitJumpTableInfo() {
1810 const DataLayout &DL = MF->getDataLayout();
1811 const MachineJumpTableInfo *MJTI = MF->getJumpTableInfo();
1812 if (!MJTI) return;
1813 if (MJTI->getEntryKind() == MachineJumpTableInfo::EK_Inline) return;
1814 const std::vector<MachineJumpTableEntry> &JT = MJTI->getJumpTables();
1815 if (JT.empty()) return;
1816
1817 // Pick the directive to use to print the jump table entries, and switch to
1818 // the appropriate section.
1819 const Function &F = MF->getFunction();
1820 const TargetLoweringObjectFile &TLOF = getObjFileLowering();
1821 bool JTInDiffSection = !TLOF.shouldPutJumpTableInFunctionSection(
1822 MJTI->getEntryKind() == MachineJumpTableInfo::EK_LabelDifference32,
1823 F);
1824 if (JTInDiffSection) {
1825 // Drop it in the readonly section.
1826 MCSection *ReadOnlySection = TLOF.getSectionForJumpTable(F, TM);
1827 OutStreamer->SwitchSection(ReadOnlySection);
1828 }
1829
1830 EmitAlignment(Align(MJTI->getEntryAlignment(DL)));
1831
1832 // Jump tables in code sections are marked with a data_region directive
1833 // where that's supported.
1834 if (!JTInDiffSection)
1835 OutStreamer->EmitDataRegion(MCDR_DataRegionJT32);
1836
1837 for (unsigned JTI = 0, e = JT.size(); JTI != e; ++JTI) {
1838 const std::vector<MachineBasicBlock*> &JTBBs = JT[JTI].MBBs;
1839
1840 // If this jump table was deleted, ignore it.
1841 if (JTBBs.empty()) continue;
1842
1843 // For the EK_LabelDifference32 entry, if using .set avoids a relocation,
1844 /// emit a .set directive for each unique entry.
1845 if (MJTI->getEntryKind() == MachineJumpTableInfo::EK_LabelDifference32 &&
1846 MAI->doesSetDirectiveSuppressReloc()) {
1847 SmallPtrSet<const MachineBasicBlock*, 16> EmittedSets;
1848 const TargetLowering *TLI = MF->getSubtarget().getTargetLowering();
1849 const MCExpr *Base = TLI->getPICJumpTableRelocBaseExpr(MF,JTI,OutContext);
1850 for (unsigned ii = 0, ee = JTBBs.size(); ii != ee; ++ii) {
1851 const MachineBasicBlock *MBB = JTBBs[ii];
1852 if (!EmittedSets.insert(MBB).second)
1853 continue;
1854
1855 // .set LJTSet, LBB32-base
1856 const MCExpr *LHS =
1857 MCSymbolRefExpr::create(MBB->getSymbol(), OutContext);
1858 OutStreamer->EmitAssignment(GetJTSetSymbol(JTI, MBB->getNumber()),
1859 MCBinaryExpr::createSub(LHS, Base,
1860 OutContext));
1861 }
1862 }
1863
1864 // On some targets (e.g. Darwin) we want to emit two consecutive labels
1865 // before each jump table. The first label is never referenced, but tells
1866 // the assembler and linker the extents of the jump table object. The
1867 // second label is actually referenced by the code.
1868 if (JTInDiffSection && DL.hasLinkerPrivateGlobalPrefix())
1869 // FIXME: This doesn't have to have any specific name, just any randomly
1870 // named and numbered local label started with 'l' would work. Simplify
1871 // GetJTISymbol.
1872 OutStreamer->EmitLabel(GetJTISymbol(JTI, true));
1873
1874 MCSymbol* JTISymbol = GetJTISymbol(JTI);
1875 if (TM.getTargetTriple().isOSBinFormatXCOFF()) {
1876 cast<MCSymbolXCOFF>(JTISymbol)->setContainingCsect(
1877 cast<MCSectionXCOFF>(TLOF.getSectionForJumpTable(F, TM)));
1878 }
1879 OutStreamer->EmitLabel(JTISymbol);
1880
1881 for (unsigned ii = 0, ee = JTBBs.size(); ii != ee; ++ii)
1882 EmitJumpTableEntry(MJTI, JTBBs[ii], JTI);
1883 }
1884 if (!JTInDiffSection)
1885 OutStreamer->EmitDataRegion(MCDR_DataRegionEnd);
1886}
1887
1888/// EmitJumpTableEntry - Emit a jump table entry for the specified MBB to the
1889/// current stream.
1890void AsmPrinter::EmitJumpTableEntry(const MachineJumpTableInfo *MJTI,
1891 const MachineBasicBlock *MBB,
1892 unsigned UID) const {
1893 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~++20200112100611+7fa5290d5bd/llvm/lib/CodeGen/AsmPrinter/AsmPrinter.cpp"
, 1893, __PRETTY_FUNCTION__))
;
1894 const MCExpr *Value = nullptr;
1895 switch (MJTI->getEntryKind()) {
1896 case MachineJumpTableInfo::EK_Inline:
1897 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~++20200112100611+7fa5290d5bd/llvm/lib/CodeGen/AsmPrinter/AsmPrinter.cpp"
, 1897)
;
1898 case MachineJumpTableInfo::EK_Custom32:
1899 Value = MF->getSubtarget().getTargetLowering()->LowerCustomJumpTableEntry(
1900 MJTI, MBB, UID, OutContext);
1901 break;
1902 case MachineJumpTableInfo::EK_BlockAddress:
1903 // EK_BlockAddress - Each entry is a plain address of block, e.g.:
1904 // .word LBB123
1905 Value = MCSymbolRefExpr::create(MBB->getSymbol(), OutContext);
1906 break;
1907 case MachineJumpTableInfo::EK_GPRel32BlockAddress: {
1908 // EK_GPRel32BlockAddress - Each entry is an address of block, encoded
1909 // with a relocation as gp-relative, e.g.:
1910 // .gprel32 LBB123
1911 MCSymbol *MBBSym = MBB->getSymbol();
1912 OutStreamer->EmitGPRel32Value(MCSymbolRefExpr::create(MBBSym, OutContext));
1913 return;
1914 }
1915
1916 case MachineJumpTableInfo::EK_GPRel64BlockAddress: {
1917 // EK_GPRel64BlockAddress - Each entry is an address of block, encoded
1918 // with a relocation as gp-relative, e.g.:
1919 // .gpdword LBB123
1920 MCSymbol *MBBSym = MBB->getSymbol();
1921 OutStreamer->EmitGPRel64Value(MCSymbolRefExpr::create(MBBSym, OutContext));
1922 return;
1923 }
1924
1925 case MachineJumpTableInfo::EK_LabelDifference32: {
1926 // Each entry is the address of the block minus the address of the jump
1927 // table. This is used for PIC jump tables where gprel32 is not supported.
1928 // e.g.:
1929 // .word LBB123 - LJTI1_2
1930 // If the .set directive avoids relocations, this is emitted as:
1931 // .set L4_5_set_123, LBB123 - LJTI1_2
1932 // .word L4_5_set_123
1933 if (MAI->doesSetDirectiveSuppressReloc()) {
1934 Value = MCSymbolRefExpr::create(GetJTSetSymbol(UID, MBB->getNumber()),
1935 OutContext);
1936 break;
1937 }
1938 Value = MCSymbolRefExpr::create(MBB->getSymbol(), OutContext);
1939 const TargetLowering *TLI = MF->getSubtarget().getTargetLowering();
1940 const MCExpr *Base = TLI->getPICJumpTableRelocBaseExpr(MF, UID, OutContext);
1941 Value = MCBinaryExpr::createSub(Value, Base, OutContext);
1942 break;
1943 }
1944 }
1945
1946 assert(Value && "Unknown entry kind!")((Value && "Unknown entry kind!") ? static_cast<void
> (0) : __assert_fail ("Value && \"Unknown entry kind!\""
, "/build/llvm-toolchain-snapshot-10~++20200112100611+7fa5290d5bd/llvm/lib/CodeGen/AsmPrinter/AsmPrinter.cpp"
, 1946, __PRETTY_FUNCTION__))
;
1947
1948 unsigned EntrySize = MJTI->getEntrySize(getDataLayout());
1949 OutStreamer->EmitValue(Value, EntrySize);
1950}
1951
1952/// EmitSpecialLLVMGlobal - Check to see if the specified global is a
1953/// special global used by LLVM. If so, emit it and return true, otherwise
1954/// do nothing and return false.
1955bool AsmPrinter::EmitSpecialLLVMGlobal(const GlobalVariable *GV) {
1956 if (GV->getName() == "llvm.used") {
1957 if (MAI->hasNoDeadStrip()) // No need to emit this at all.
1958 EmitLLVMUsedList(cast<ConstantArray>(GV->getInitializer()));
1959 return true;
1960 }
1961
1962 // Ignore debug and non-emitted data. This handles llvm.compiler.used.
1963 if (GV->getSection() == "llvm.metadata" ||
1964 GV->hasAvailableExternallyLinkage())
1965 return true;
1966
1967 if (!GV->hasAppendingLinkage()) return false;
1968
1969 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~++20200112100611+7fa5290d5bd/llvm/lib/CodeGen/AsmPrinter/AsmPrinter.cpp"
, 1969, __PRETTY_FUNCTION__))
;
1970
1971 if (GV->getName() == "llvm.global_ctors") {
1972 EmitXXStructorList(GV->getParent()->getDataLayout(), GV->getInitializer(),
1973 /* isCtor */ true);
1974
1975 return true;
1976 }
1977
1978 if (GV->getName() == "llvm.global_dtors") {
1979 EmitXXStructorList(GV->getParent()->getDataLayout(), GV->getInitializer(),
1980 /* isCtor */ false);
1981
1982 return true;
1983 }
1984
1985 report_fatal_error("unknown special variable");
1986}
1987
1988/// EmitLLVMUsedList - For targets that define a MAI::UsedDirective, mark each
1989/// global in the specified llvm.used list.
1990void AsmPrinter::EmitLLVMUsedList(const ConstantArray *InitList) {
1991 // Should be an array of 'i8*'.
1992 for (unsigned i = 0, e = InitList->getNumOperands(); i != e; ++i) {
1993 const GlobalValue *GV =
1994 dyn_cast<GlobalValue>(InitList->getOperand(i)->stripPointerCasts());
1995 if (GV)
1996 OutStreamer->EmitSymbolAttribute(getSymbol(GV), MCSA_NoDeadStrip);
1997 }
1998}
1999
2000namespace {
2001
2002struct Structor {
2003 int Priority = 0;
2004 Constant *Func = nullptr;
2005 GlobalValue *ComdatKey = nullptr;
2006
2007 Structor() = default;
2008};
2009
2010} // end anonymous namespace
2011
2012/// EmitXXStructorList - Emit the ctor or dtor list taking into account the init
2013/// priority.
2014void AsmPrinter::EmitXXStructorList(const DataLayout &DL, const Constant *List,
2015 bool isCtor) {
2016 // Should be an array of '{ i32, void ()*, i8* }' structs. The first value is the
2017 // init priority.
2018 if (!isa<ConstantArray>(List)) return;
2019
2020 // Sanity check the structors list.
2021 const ConstantArray *InitList = dyn_cast<ConstantArray>(List);
2022 if (!InitList) return; // Not an array!
2023 StructType *ETy = dyn_cast<StructType>(InitList->getType()->getElementType());
2024 if (!ETy || ETy->getNumElements() != 3 ||
2025 !isa<IntegerType>(ETy->getTypeAtIndex(0U)) ||
2026 !isa<PointerType>(ETy->getTypeAtIndex(1U)) ||
2027 !isa<PointerType>(ETy->getTypeAtIndex(2U)))
2028 return; // Not (int, ptr, ptr).
2029
2030 // Gather the structors in a form that's convenient for sorting by priority.
2031 SmallVector<Structor, 8> Structors;
2032 for (Value *O : InitList->operands()) {
2033 ConstantStruct *CS = dyn_cast<ConstantStruct>(O);
2034 if (!CS) continue; // Malformed.
2035 if (CS->getOperand(1)->isNullValue())
2036 break; // Found a null terminator, skip the rest.
2037 ConstantInt *Priority = dyn_cast<ConstantInt>(CS->getOperand(0));
2038 if (!Priority) continue; // Malformed.
2039 Structors.push_back(Structor());
2040 Structor &S = Structors.back();
2041 S.Priority = Priority->getLimitedValue(65535);
2042 S.Func = CS->getOperand(1);
2043 if (!CS->getOperand(2)->isNullValue())
2044 S.ComdatKey =
2045 dyn_cast<GlobalValue>(CS->getOperand(2)->stripPointerCasts());
2046 }
2047
2048 // Emit the function pointers in the target-specific order
2049 llvm::stable_sort(Structors, [](const Structor &L, const Structor &R) {
2050 return L.Priority < R.Priority;
2051 });
2052 const Align Align = DL.getPointerPrefAlignment();
2053 for (Structor &S : Structors) {
2054 const TargetLoweringObjectFile &Obj = getObjFileLowering();
2055 const MCSymbol *KeySym = nullptr;
2056 if (GlobalValue *GV = S.ComdatKey) {
2057 if (GV->isDeclarationForLinker())
2058 // If the associated variable is not defined in this module
2059 // (it might be available_externally, or have been an
2060 // available_externally definition that was dropped by the
2061 // EliminateAvailableExternally pass), some other TU
2062 // will provide its dynamic initializer.
2063 continue;
2064
2065 KeySym = getSymbol(GV);
2066 }
2067 MCSection *OutputSection =
2068 (isCtor ? Obj.getStaticCtorSection(S.Priority, KeySym)
2069 : Obj.getStaticDtorSection(S.Priority, KeySym));
2070 OutStreamer->SwitchSection(OutputSection);
2071 if (OutStreamer->getCurrentSection() != OutStreamer->getPreviousSection())
2072 EmitAlignment(Align);
2073 EmitXXStructor(DL, S.Func);
2074 }
2075}
2076
2077void AsmPrinter::EmitModuleIdents(Module &M) {
2078 if (!MAI->hasIdentDirective())
2079 return;
2080
2081 if (const NamedMDNode *NMD = M.getNamedMetadata("llvm.ident")) {
2082 for (unsigned i = 0, e = NMD->getNumOperands(); i != e; ++i) {
2083 const MDNode *N = NMD->getOperand(i);
2084 assert(N->getNumOperands() == 1 &&((N->getNumOperands() == 1 && "llvm.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~++20200112100611+7fa5290d5bd/llvm/lib/CodeGen/AsmPrinter/AsmPrinter.cpp"
, 2085, __PRETTY_FUNCTION__))
2085 "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~++20200112100611+7fa5290d5bd/llvm/lib/CodeGen/AsmPrinter/AsmPrinter.cpp"
, 2085, __PRETTY_FUNCTION__))
;
2086 const MDString *S = cast<MDString>(N->getOperand(0));
2087 OutStreamer->EmitIdent(S->getString());
2088 }
2089 }
2090}
2091
2092void AsmPrinter::EmitModuleCommandLines(Module &M) {
2093 MCSection *CommandLine = getObjFileLowering().getSectionForCommandLines();
2094 if (!CommandLine)
2095 return;
2096
2097 const NamedMDNode *NMD = M.getNamedMetadata("llvm.commandline");
2098 if (!NMD || !NMD->getNumOperands())
2099 return;
2100
2101 OutStreamer->PushSection();
2102 OutStreamer->SwitchSection(CommandLine);
2103 OutStreamer->EmitZeros(1);
2104 for (unsigned i = 0, e = NMD->getNumOperands(); i != e; ++i) {
2105 const MDNode *N = NMD->getOperand(i);
2106 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~++20200112100611+7fa5290d5bd/llvm/lib/CodeGen/AsmPrinter/AsmPrinter.cpp"
, 2107, __PRETTY_FUNCTION__))
2107 "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~++20200112100611+7fa5290d5bd/llvm/lib/CodeGen/AsmPrinter/AsmPrinter.cpp"
, 2107, __PRETTY_FUNCTION__))
;
2108 const MDString *S = cast<MDString>(N->getOperand(0));
2109 OutStreamer->EmitBytes(S->getString());
2110 OutStreamer->EmitZeros(1);
2111 }
2112 OutStreamer->PopSection();
2113}
2114
2115//===--------------------------------------------------------------------===//
2116// Emission and print routines
2117//
2118
2119/// Emit a byte directive and value.
2120///
2121void AsmPrinter::emitInt8(int Value) const {
2122 OutStreamer->EmitIntValue(Value, 1);
2123}
2124
2125/// Emit a short directive and value.
2126void AsmPrinter::emitInt16(int Value) const {
2127 OutStreamer->EmitIntValue(Value, 2);
2128}
2129
2130/// Emit a long directive and value.
2131void AsmPrinter::emitInt32(int Value) const {
2132 OutStreamer->EmitIntValue(Value, 4);
2133}
2134
2135/// Emit a long long directive and value.
2136void AsmPrinter::emitInt64(uint64_t Value) const {
2137 OutStreamer->EmitIntValue(Value, 8);
2138}
2139
2140/// Emit something like ".long Hi-Lo" where the size in bytes of the directive
2141/// is specified by Size and Hi/Lo specify the labels. This implicitly uses
2142/// .set if it avoids relocations.
2143void AsmPrinter::EmitLabelDifference(const MCSymbol *Hi, const MCSymbol *Lo,
2144 unsigned Size) const {
2145 OutStreamer->emitAbsoluteSymbolDiff(Hi, Lo, Size);
2146}
2147
2148/// EmitLabelPlusOffset - Emit something like ".long Label+Offset"
2149/// where the size in bytes of the directive is specified by Size and Label
2150/// specifies the label. This implicitly uses .set if it is available.
2151void AsmPrinter::EmitLabelPlusOffset(const MCSymbol *Label, uint64_t Offset,
2152 unsigned Size,
2153 bool IsSectionRelative) const {
2154 if (MAI->needsDwarfSectionOffsetDirective() && IsSectionRelative) {
2155 OutStreamer->EmitCOFFSecRel32(Label, Offset);
2156 if (Size > 4)
2157 OutStreamer->EmitZeros(Size - 4);
2158 return;
2159 }
2160
2161 // Emit Label+Offset (or just Label if Offset is zero)
2162 const MCExpr *Expr = MCSymbolRefExpr::create(Label, OutContext);
2163 if (Offset)
2164 Expr = MCBinaryExpr::createAdd(
2165 Expr, MCConstantExpr::create(Offset, OutContext), OutContext);
2166
2167 OutStreamer->EmitValue(Expr, Size);
2168}
2169
2170//===----------------------------------------------------------------------===//
2171
2172// EmitAlignment - Emit an alignment directive to the specified power of
2173// two boundary. If a global value is specified, and if that global has
2174// an explicit alignment requested, it will override the alignment request
2175// if required for correctness.
2176void AsmPrinter::EmitAlignment(Align Alignment, const GlobalObject *GV) const {
2177 if (GV)
2178 Alignment = getGVAlignment(GV, GV->getParent()->getDataLayout(), Alignment);
2179
2180 if (Alignment == Align::None())
2181 return; // 1-byte aligned: no need to emit alignment.
2182
2183 if (getCurrentSection()->getKind().isText())
2184 OutStreamer->EmitCodeAlignment(Alignment.value());
2185 else
2186 OutStreamer->EmitValueToAlignment(Alignment.value());
2187}
2188
2189//===----------------------------------------------------------------------===//
2190// Constant emission.
2191//===----------------------------------------------------------------------===//
2192
2193const MCExpr *AsmPrinter::lowerConstant(const Constant *CV) {
2194 MCContext &Ctx = OutContext;
2195
2196 if (CV->isNullValue() || isa<UndefValue>(CV))
2197 return MCConstantExpr::create(0, Ctx);
2198
2199 if (const ConstantInt *CI = dyn_cast<ConstantInt>(CV))
2200 return MCConstantExpr::create(CI->getZExtValue(), Ctx);
2201
2202 if (const GlobalValue *GV = dyn_cast<GlobalValue>(CV))
2203 return MCSymbolRefExpr::create(getSymbol(GV), Ctx);
2204
2205 if (const BlockAddress *BA = dyn_cast<BlockAddress>(CV))
2206 return MCSymbolRefExpr::create(GetBlockAddressSymbol(BA), Ctx);
2207
2208 const ConstantExpr *CE = dyn_cast<ConstantExpr>(CV);
2209 if (!CE) {
2210 llvm_unreachable("Unknown constant value to lower!")::llvm::llvm_unreachable_internal("Unknown constant value to lower!"
, "/build/llvm-toolchain-snapshot-10~++20200112100611+7fa5290d5bd/llvm/lib/CodeGen/AsmPrinter/AsmPrinter.cpp"
, 2210)
;
2211 }
2212
2213 switch (CE->getOpcode()) {
2214 default:
2215 // If the code isn't optimized, there may be outstanding folding
2216 // opportunities. Attempt to fold the expression using DataLayout as a
2217 // last resort before giving up.
2218 if (Constant *C = ConstantFoldConstant(CE, getDataLayout()))
2219 if (C != CE)
2220 return lowerConstant(C);
2221
2222 // Otherwise report the problem to the user.
2223 {
2224 std::string S;
2225 raw_string_ostream OS(S);
2226 OS << "Unsupported expression in static initializer: ";
2227 CE->printAsOperand(OS, /*PrintType=*/false,
2228 !MF ? nullptr : MF->getFunction().getParent());
2229 report_fatal_error(OS.str());
2230 }
2231 case Instruction::GetElementPtr: {
2232 // Generate a symbolic expression for the byte address
2233 APInt OffsetAI(getDataLayout().getPointerTypeSizeInBits(CE->getType()), 0);
2234 cast<GEPOperator>(CE)->accumulateConstantOffset(getDataLayout(), OffsetAI);
2235
2236 const MCExpr *Base = lowerConstant(CE->getOperand(0));
2237 if (!OffsetAI)
2238 return Base;
2239
2240 int64_t Offset = OffsetAI.getSExtValue();
2241 return MCBinaryExpr::createAdd(Base, MCConstantExpr::create(Offset, Ctx),
2242 Ctx);
2243 }
2244
2245 case Instruction::Trunc:
2246 // We emit the value and depend on the assembler to truncate the generated
2247 // expression properly. This is important for differences between
2248 // blockaddress labels. Since the two labels are in the same function, it
2249 // is reasonable to treat their delta as a 32-bit value.
2250 LLVM_FALLTHROUGH[[gnu::fallthrough]];
2251 case Instruction::BitCast:
2252 return lowerConstant(CE->getOperand(0));
2253
2254 case Instruction::IntToPtr: {
2255 const DataLayout &DL = getDataLayout();
2256
2257 // Handle casts to pointers by changing them into casts to the appropriate
2258 // integer type. This promotes constant folding and simplifies this code.
2259 Constant *Op = CE->getOperand(0);
2260 Op = ConstantExpr::getIntegerCast(Op, DL.getIntPtrType(CV->getType()),
2261 false/*ZExt*/);
2262 return lowerConstant(Op);
2263 }
2264
2265 case Instruction::PtrToInt: {
2266 const DataLayout &DL = getDataLayout();
2267
2268 // Support only foldable casts to/from pointers that can be eliminated by
2269 // changing the pointer to the appropriately sized integer type.
2270 Constant *Op = CE->getOperand(0);
2271 Type *Ty = CE->getType();
2272
2273 const MCExpr *OpExpr = lowerConstant(Op);
2274
2275 // We can emit the pointer value into this slot if the slot is an
2276 // integer slot equal to the size of the pointer.
2277 //
2278 // If the pointer is larger than the resultant integer, then
2279 // as with Trunc just depend on the assembler to truncate it.
2280 if (DL.getTypeAllocSize(Ty) <= DL.getTypeAllocSize(Op->getType()))
2281 return OpExpr;
2282
2283 // Otherwise the pointer is smaller than the resultant integer, mask off
2284 // the high bits so we are sure to get a proper truncation if the input is
2285 // a constant expr.
2286 unsigned InBits = DL.getTypeAllocSizeInBits(Op->getType());
2287 const MCExpr *MaskExpr = MCConstantExpr::create(~0ULL >> (64-InBits), Ctx);
2288 return MCBinaryExpr::createAnd(OpExpr, MaskExpr, Ctx);
2289 }
2290
2291 case Instruction::Sub: {
2292 GlobalValue *LHSGV;
2293 APInt LHSOffset;
2294 if (IsConstantOffsetFromGlobal(CE->getOperand(0), LHSGV, LHSOffset,
2295 getDataLayout())) {
2296 GlobalValue *RHSGV;
2297 APInt RHSOffset;
2298 if (IsConstantOffsetFromGlobal(CE->getOperand(1), RHSGV, RHSOffset,
2299 getDataLayout())) {
2300 const MCExpr *RelocExpr =
2301 getObjFileLowering().lowerRelativeReference(LHSGV, RHSGV, TM);
2302 if (!RelocExpr)
2303 RelocExpr = MCBinaryExpr::createSub(
2304 MCSymbolRefExpr::create(getSymbol(LHSGV), Ctx),
2305 MCSymbolRefExpr::create(getSymbol(RHSGV), Ctx), Ctx);
2306 int64_t Addend = (LHSOffset - RHSOffset).getSExtValue();
2307 if (Addend != 0)
2308 RelocExpr = MCBinaryExpr::createAdd(
2309 RelocExpr, MCConstantExpr::create(Addend, Ctx), Ctx);
2310 return RelocExpr;
2311 }
2312 }
2313 }
2314 // else fallthrough
2315 LLVM_FALLTHROUGH[[gnu::fallthrough]];
2316
2317 // The MC library also has a right-shift operator, but it isn't consistently
2318 // signed or unsigned between different targets.
2319 case Instruction::Add:
2320 case Instruction::Mul:
2321 case Instruction::SDiv:
2322 case Instruction::SRem:
2323 case Instruction::Shl:
2324 case Instruction::And:
2325 case Instruction::Or:
2326 case Instruction::Xor: {
2327 const MCExpr *LHS = lowerConstant(CE->getOperand(0));
2328 const MCExpr *RHS = lowerConstant(CE->getOperand(1));
2329 switch (CE->getOpcode()) {
2330 default: llvm_unreachable("Unknown binary operator constant cast expr")::llvm::llvm_unreachable_internal("Unknown binary operator constant cast expr"
, "/build/llvm-toolchain-snapshot-10~++20200112100611+7fa5290d5bd/llvm/lib/CodeGen/AsmPrinter/AsmPrinter.cpp"
, 2330)
;
2331 case Instruction::Add: return MCBinaryExpr::createAdd(LHS, RHS, Ctx);
2332 case Instruction::Sub: return MCBinaryExpr::createSub(LHS, RHS, Ctx);
2333 case Instruction::Mul: return MCBinaryExpr::createMul(LHS, RHS, Ctx);
2334 case Instruction::SDiv: return MCBinaryExpr::createDiv(LHS, RHS, Ctx);
2335 case Instruction::SRem: return MCBinaryExpr::createMod(LHS, RHS, Ctx);
2336 case Instruction::Shl: return MCBinaryExpr::createShl(LHS, RHS, Ctx);
2337 case Instruction::And: return MCBinaryExpr::createAnd(LHS, RHS, Ctx);
2338 case Instruction::Or: return MCBinaryExpr::createOr (LHS, RHS, Ctx);
2339 case Instruction::Xor: return MCBinaryExpr::createXor(LHS, RHS, Ctx);
2340 }
2341 }
2342 }
2343}
2344
2345static void emitGlobalConstantImpl(const DataLayout &DL, const Constant *C,
2346 AsmPrinter &AP,
2347 const Constant *BaseCV = nullptr,
2348 uint64_t Offset = 0);
2349
2350static void emitGlobalConstantFP(const ConstantFP *CFP, AsmPrinter &AP);
2351static void emitGlobalConstantFP(APFloat APF, Type *ET, AsmPrinter &AP);
2352
2353/// isRepeatedByteSequence - Determine whether the given value is
2354/// composed of a repeated sequence of identical bytes and return the
2355/// byte value. If it is not a repeated sequence, return -1.
2356static int isRepeatedByteSequence(const ConstantDataSequential *V) {
2357 StringRef Data = V->getRawDataValues();
2358 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~++20200112100611+7fa5290d5bd/llvm/lib/CodeGen/AsmPrinter/AsmPrinter.cpp"
, 2358, __PRETTY_FUNCTION__))
;
2359 char C = Data[0];
2360 for (unsigned i = 1, e = Data.size(); i != e; ++i)
2361 if (Data[i] != C) return -1;
2362 return static_cast<uint8_t>(C); // Ensure 255 is not returned as -1.
2363}
2364
2365/// isRepeatedByteSequence - Determine whether the given value is
2366/// composed of a repeated sequence of identical bytes and return the
2367/// byte value. If it is not a repeated sequence, return -1.
2368static int isRepeatedByteSequence(const Value *V, const DataLayout &DL) {
2369 if (const ConstantInt *CI = dyn_cast<ConstantInt>(V)) {
2370 uint64_t Size = DL.getTypeAllocSizeInBits(V->getType());
2371 assert(Size % 8 == 0)((Size % 8 == 0) ? static_cast<void> (0) : __assert_fail
("Size % 8 == 0", "/build/llvm-toolchain-snapshot-10~++20200112100611+7fa5290d5bd/llvm/lib/CodeGen/AsmPrinter/AsmPrinter.cpp"
, 2371, __PRETTY_FUNCTION__))
;
2372
2373 // Extend the element to take zero padding into account.
2374 APInt Value = CI->getValue().zextOrSelf(Size);
2375 if (!Value.isSplat(8))
2376 return -1;
2377
2378 return Value.zextOrTrunc(8).getZExtValue();
2379 }
2380 if (const ConstantArray *CA = dyn_cast<ConstantArray>(V)) {
2381 // Make sure all array elements are sequences of the same repeated
2382 // byte.
2383 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~++20200112100611+7fa5290d5bd/llvm/lib/CodeGen/AsmPrinter/AsmPrinter.cpp"
, 2383, __PRETTY_FUNCTION__))
;
2384 Constant *Op0 = CA->getOperand(0);
2385 int Byte = isRepeatedByteSequence(Op0, DL);
2386 if (Byte == -1)
2387 return -1;
2388
2389 // All array elements must be equal.
2390 for (unsigned i = 1, e = CA->getNumOperands(); i != e; ++i)
2391 if (CA->getOperand(i) != Op0)
2392 return -1;
2393 return Byte;
2394 }
2395
2396 if (const ConstantDataSequential *CDS = dyn_cast<ConstantDataSequential>(V))
2397 return isRepeatedByteSequence(CDS);
2398
2399 return -1;
2400}
2401
2402static void emitGlobalConstantDataSequential(const DataLayout &DL,
2403 const ConstantDataSequential *CDS,
2404 AsmPrinter &AP) {
2405 // See if we can aggregate this into a .fill, if so, emit it as such.
2406 int Value = isRepeatedByteSequence(CDS, DL);
2407 if (Value != -1) {
2408 uint64_t Bytes = DL.getTypeAllocSize(CDS->getType());
2409 // Don't emit a 1-byte object as a .fill.
2410 if (Bytes > 1)
2411 return AP.OutStreamer->emitFill(Bytes, Value);
2412 }
2413
2414 // If this can be emitted with .ascii/.asciz, emit it as such.
2415 if (CDS->isString())
2416 return AP.OutStreamer->EmitBytes(CDS->getAsString());
2417
2418 // Otherwise, emit the values in successive locations.
2419 unsigned ElementByteSize = CDS->getElementByteSize();
2420 if (isa<IntegerType>(CDS->getElementType())) {
2421 for (unsigned i = 0, e = CDS->getNumElements(); i != e; ++i) {
2422 if (AP.isVerbose())
2423 AP.OutStreamer->GetCommentOS() << format("0x%" PRIx64"l" "x" "\n",
2424 CDS->getElementAsInteger(i));
2425 AP.OutStreamer->EmitIntValue(CDS->getElementAsInteger(i),
2426 ElementByteSize);
2427 }
2428 } else {
2429 Type *ET = CDS->getElementType();
2430 for (unsigned I = 0, E = CDS->getNumElements(); I != E; ++I)
2431 emitGlobalConstantFP(CDS->getElementAsAPFloat(I), ET, AP);
2432 }
2433
2434 unsigned Size = DL.getTypeAllocSize(CDS->getType());
2435 unsigned EmittedSize = DL.getTypeAllocSize(CDS->getType()->getElementType()) *
2436 CDS->getNumElements();
2437 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~++20200112100611+7fa5290d5bd/llvm/lib/CodeGen/AsmPrinter/AsmPrinter.cpp"
, 2437, __PRETTY_FUNCTION__))
;
2438 if (unsigned Padding = Size - EmittedSize)
2439 AP.OutStreamer->EmitZeros(Padding);
2440}
2441
2442static void emitGlobalConstantArray(const DataLayout &DL,
2443 const ConstantArray *CA, AsmPrinter &AP,
2444 const Constant *BaseCV, uint64_t Offset) {
2445 // See if we can aggregate some values. Make sure it can be
2446 // represented as a series of bytes of the constant value.
2447 int Value = isRepeatedByteSequence(CA, DL);
2448
2449 if (Value != -1) {
2450 uint64_t Bytes = DL.getTypeAllocSize(CA->getType());
2451 AP.OutStreamer->emitFill(Bytes, Value);
2452 }
2453 else {
2454 for (unsigned i = 0, e = CA->getNumOperands(); i != e; ++i) {
2455 emitGlobalConstantImpl(DL, CA->getOperand(i), AP, BaseCV, Offset);
2456 Offset += DL.getTypeAllocSize(CA->getOperand(i)->getType());
2457 }
2458 }
2459}
2460
2461static void emitGlobalConstantVector(const DataLayout &DL,
2462 const ConstantVector *CV, AsmPrinter &AP) {
2463 for (unsigned i = 0, e = CV->getType()->getNumElements(); i != e; ++i)
2464 emitGlobalConstantImpl(DL, CV->getOperand(i), AP);
2465
2466 unsigned Size = DL.getTypeAllocSize(CV->getType());
2467 unsigned EmittedSize = DL.getTypeAllocSize(CV->getType()->getElementType()) *
2468 CV->getType()->getNumElements();
2469 if (unsigned Padding = Size - EmittedSize)
2470 AP.OutStreamer->EmitZeros(Padding);
2471}
2472
2473static void emitGlobalConstantStruct(const DataLayout &DL,
2474 const ConstantStruct *CS, AsmPrinter &AP,
2475 const Constant *BaseCV, uint64_t Offset) {
2476 // Print the fields in successive locations. Pad to align if needed!
2477 unsigned Size = DL.getTypeAllocSize(CS->getType());
2478 const StructLayout *Layout = DL.getStructLayout(CS->getType());
2479 uint64_t SizeSoFar = 0;
2480 for (unsigned i = 0, e = CS->getNumOperands(); i != e; ++i) {
2481 const Constant *Field = CS->getOperand(i);
2482
2483 // Print the actual field value.
2484 emitGlobalConstantImpl(DL, Field, AP, BaseCV, Offset + SizeSoFar);
2485
2486 // Check if padding is needed and insert one or more 0s.
2487 uint64_t FieldSize = DL.getTypeAllocSize(Field->getType());
2488 uint64_t PadSize = ((i == e-1 ? Size : Layout->getElementOffset(i+1))
2489 - Layout->getElementOffset(i)) - FieldSize;
2490 SizeSoFar += FieldSize + PadSize;
2491
2492 // Insert padding - this may include padding to increase the size of the
2493 // current field up to the ABI size (if the struct is not packed) as well
2494 // as padding to ensure that the next field starts at the right offset.
2495 AP.OutStreamer->EmitZeros(PadSize);
2496 }
2497 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~++20200112100611+7fa5290d5bd/llvm/lib/CodeGen/AsmPrinter/AsmPrinter.cpp"
, 2498, __PRETTY_FUNCTION__))
2498 "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~++20200112100611+7fa5290d5bd/llvm/lib/CodeGen/AsmPrinter/AsmPrinter.cpp"
, 2498, __PRETTY_FUNCTION__))
;
2499}
2500
2501static void emitGlobalConstantFP(APFloat APF, Type *ET, AsmPrinter &AP) {
2502 assert(ET && "Unknown float type")((ET && "Unknown float type") ? static_cast<void>
(0) : __assert_fail ("ET && \"Unknown float type\"",
"/build/llvm-toolchain-snapshot-10~++20200112100611+7fa5290d5bd/llvm/lib/CodeGen/AsmPrinter/AsmPrinter.cpp"
, 2502, __PRETTY_FUNCTION__))
;
2503 APInt API = APF.bitcastToAPInt();
2504
2505 // First print a comment with what we think the original floating-point value
2506 // should have been.
2507 if (AP.isVerbose()) {
2508 SmallString<8> StrVal;
2509 APF.toString(StrVal);
2510 ET->print(AP.OutStreamer->GetCommentOS());
2511 AP.OutStreamer->GetCommentOS() << ' ' << StrVal << '\n';
2512 }
2513
2514 // Now iterate through the APInt chunks, emitting them in endian-correct
2515 // order, possibly with a smaller chunk at beginning/end (e.g. for x87 80-bit
2516 // floats).
2517 unsigned NumBytes = API.getBitWidth() / 8;
2518 unsigned TrailingBytes = NumBytes % sizeof(uint64_t);
2519 const uint64_t *p = API.getRawData();
2520
2521 // PPC's long double has odd notions of endianness compared to how LLVM
2522 // handles it: p[0] goes first for *big* endian on PPC.
2523 if (AP.getDataLayout().isBigEndian() && !ET->isPPC_FP128Ty()) {
2524 int Chunk = API.getNumWords() - 1;
2525
2526 if (TrailingBytes)
2527 AP.OutStreamer->EmitIntValue(p[Chunk--], TrailingBytes);
2528
2529 for (; Chunk >= 0; --Chunk)
2530 AP.OutStreamer->EmitIntValue(p[Chunk], sizeof(uint64_t));
2531 } else {
2532 unsigned Chunk;
2533 for (Chunk = 0; Chunk < NumBytes / sizeof(uint64_t); ++Chunk)
2534 AP.OutStreamer->EmitIntValue(p[Chunk], sizeof(uint64_t));
2535
2536 if (TrailingBytes)
2537 AP.OutStreamer->EmitIntValue(p[Chunk], TrailingBytes);
2538 }
2539
2540 // Emit the tail padding for the long double.
2541 const DataLayout &DL = AP.getDataLayout();
2542 AP.OutStreamer->EmitZeros(DL.getTypeAllocSize(ET) - DL.getTypeStoreSize(ET));
2543}
2544
2545static void emitGlobalConstantFP(const ConstantFP *CFP, AsmPrinter &AP) {
2546 emitGlobalConstantFP(CFP->getValueAPF(), CFP->getType(), AP);
2547}
2548
2549static void emitGlobalConstantLargeInt(const ConstantInt *CI, AsmPrinter &AP) {
2550 const DataLayout &DL = AP.getDataLayout();
2551 unsigned BitWidth = CI->getBitWidth();
2552
2553 // Copy the value as we may massage the layout for constants whose bit width
2554 // is not a multiple of 64-bits.
2555 APInt Realigned(CI->getValue());
2556 uint64_t ExtraBits = 0;
2557 unsigned ExtraBitsSize = BitWidth & 63;
2558
2559 if (ExtraBitsSize) {
2560 // The bit width of the data is not a multiple of 64-bits.
2561 // The extra bits are expected to be at the end of the chunk of the memory.
2562 // Little endian:
2563 // * Nothing to be done, just record the extra bits to emit.
2564 // Big endian:
2565 // * Record the extra bits to emit.
2566 // * Realign the raw data to emit the chunks of 64-bits.
2567 if (DL.isBigEndian()) {
2568 // Basically the structure of the raw data is a chunk of 64-bits cells:
2569 // 0 1 BitWidth / 64
2570 // [chunk1][chunk2] ... [chunkN].
2571 // The most significant chunk is chunkN and it should be emitted first.
2572 // However, due to the alignment issue chunkN contains useless bits.
2573 // Realign the chunks so that they contain only useless information:
2574 // ExtraBits 0 1 (BitWidth / 64) - 1
2575 // chu[nk1 chu][nk2 chu] ... [nkN-1 chunkN]
2576 ExtraBits = Realigned.getRawData()[0] &
2577 (((uint64_t)-1) >> (64 - ExtraBitsSize));
2578 Realigned.lshrInPlace(ExtraBitsSize);
2579 } else
2580 ExtraBits = Realigned.getRawData()[BitWidth / 64];
2581 }
2582
2583 // We don't expect assemblers to support integer data directives
2584 // for more than 64 bits, so we emit the data in at most 64-bit
2585 // quantities at a time.
2586 const uint64_t *RawData = Realigned.getRawData();
2587 for (unsigned i = 0, e = BitWidth / 64; i != e; ++i) {
2588 uint64_t Val = DL.isBigEndian() ? RawData[e - i - 1] : RawData[i];
2589 AP.OutStreamer->EmitIntValue(Val, 8);
2590 }
2591
2592 if (ExtraBitsSize) {
2593 // Emit the extra bits after the 64-bits chunks.
2594
2595 // Emit a directive that fills the expected size.
2596 uint64_t Size = AP.getDataLayout().getTypeAllocSize(CI->getType());
2597 Size -= (BitWidth / 64) * 8;
2598 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~++20200112100611+7fa5290d5bd/llvm/lib/CodeGen/AsmPrinter/AsmPrinter.cpp"
, 2600, __PRETTY_FUNCTION__))
2599 (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~++20200112100611+7fa5290d5bd/llvm/lib/CodeGen/AsmPrinter/AsmPrinter.cpp"
, 2600, __PRETTY_FUNCTION__))
2600 == 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~++20200112100611+7fa5290d5bd/llvm/lib/CodeGen/AsmPrinter/AsmPrinter.cpp"
, 2600, __PRETTY_FUNCTION__))
;
2601 AP.OutStreamer->EmitIntValue(ExtraBits, Size);
2602 }
2603}
2604
2605/// Transform a not absolute MCExpr containing a reference to a GOT
2606/// equivalent global, by a target specific GOT pc relative access to the
2607/// final symbol.
2608static void handleIndirectSymViaGOTPCRel(AsmPrinter &AP, const MCExpr **ME,
2609 const Constant *BaseCst,
2610 uint64_t Offset) {
2611 // The global @foo below illustrates a global that uses a got equivalent.
2612 //
2613 // @bar = global i32 42
2614 // @gotequiv = private unnamed_addr constant i32* @bar
2615 // @foo = i32 trunc (i64 sub (i64 ptrtoint (i32** @gotequiv to i64),
2616 // i64 ptrtoint (i32* @foo to i64))
2617 // to i32)
2618 //
2619 // The cstexpr in @foo is converted into the MCExpr `ME`, where we actually
2620 // check whether @foo is suitable to use a GOTPCREL. `ME` is usually in the
2621 // form:
2622 //
2623 // foo = cstexpr, where
2624 // cstexpr := <gotequiv> - "." + <cst>
2625 // cstexpr := <gotequiv> - (<foo> - <offset from @foo base>) + <cst>
2626 //
2627 // After canonicalization by evaluateAsRelocatable `ME` turns into:
2628 //
2629 // cstexpr := <gotequiv> - <foo> + gotpcrelcst, where
2630 // gotpcrelcst := <offset from @foo base> + <cst>
2631 MCValue MV;
2632 if (!(*ME)->evaluateAsRelocatable(MV, nullptr, nullptr) || MV.isAbsolute())
2633 return;
2634 const MCSymbolRefExpr *SymA = MV.getSymA();
2635 if (!SymA)
2636 return;
2637
2638 // Check that GOT equivalent symbol is cached.
2639 const MCSymbol *GOTEquivSym = &SymA->getSymbol();
2640 if (!AP.GlobalGOTEquivs.count(GOTEquivSym))
2641 return;
2642
2643 const GlobalValue *BaseGV = dyn_cast_or_null<GlobalValue>(BaseCst);
2644 if (!BaseGV)
2645 return;
2646
2647 // Check for a valid base symbol
2648 const MCSymbol *BaseSym = AP.getSymbol(BaseGV);
2649 const MCSymbolRefExpr *SymB = MV.getSymB();
2650
2651 if (!SymB || BaseSym != &SymB->getSymbol())
2652 return;
2653
2654 // Make sure to match:
2655 //
2656 // gotpcrelcst := <offset from @foo base> + <cst>
2657 //
2658 // If gotpcrelcst is positive it means that we can safely fold the pc rel
2659 // displacement into the GOTPCREL. We can also can have an extra offset <cst>
2660 // if the target knows how to encode it.
2661 int64_t GOTPCRelCst = Offset + MV.getConstant();
2662 if (GOTPCRelCst < 0)
2663 return;
2664 if (!AP.getObjFileLowering().supportGOTPCRelWithOffset() && GOTPCRelCst != 0)
2665 return;
2666
2667 // Emit the GOT PC relative to replace the got equivalent global, i.e.:
2668 //
2669 // bar:
2670 // .long 42
2671 // gotequiv:
2672 // .quad bar
2673 // foo:
2674 // .long gotequiv - "." + <cst>
2675 //
2676 // is replaced by the target specific equivalent to:
2677 //
2678 // bar:
2679 // .long 42
2680 // foo:
2681 // .long bar@GOTPCREL+<gotpcrelcst>
2682 AsmPrinter::GOTEquivUsePair Result = AP.GlobalGOTEquivs[GOTEquivSym];
2683 const GlobalVariable *GV = Result.first;
2684 int NumUses = (int)Result.second;
2685 const GlobalValue *FinalGV = dyn_cast<GlobalValue>(GV->getOperand(0));
2686 const MCSymbol *FinalSym = AP.getSymbol(FinalGV);
2687 *ME = AP.getObjFileLowering().getIndirectSymViaGOTPCRel(
2688 FinalGV, FinalSym, MV, Offset, AP.MMI, *AP.OutStreamer);
2689
2690 // Update GOT equivalent usage information
2691 --NumUses;
2692 if (NumUses >= 0)
2693 AP.GlobalGOTEquivs[GOTEquivSym] = std::make_pair(GV, NumUses);
2694}
2695
2696static void emitGlobalConstantImpl(const DataLayout &DL, const Constant *CV,
2697 AsmPrinter &AP, const Constant *BaseCV,
2698 uint64_t Offset) {
2699 uint64_t Size = DL.getTypeAllocSize(CV->getType());
2700
2701 // Globals with sub-elements such as combinations of arrays and structs
2702 // are handled recursively by emitGlobalConstantImpl. Keep track of the
2703 // constant symbol base and the current position with BaseCV and Offset.
2704 if (!BaseCV && CV->hasOneUse())
2705 BaseCV = dyn_cast<Constant>(CV->user_back());
2706
2707 if (isa<ConstantAggregateZero>(CV) || isa<UndefValue>(CV))
2708 return AP.OutStreamer->EmitZeros(Size);
2709
2710 if (const ConstantInt *CI = dyn_cast<ConstantInt>(CV)) {
2711 switch (Size) {
2712 case 1:
2713 case 2:
2714 case 4:
2715 case 8:
2716 if (AP.isVerbose())
2717 AP.OutStreamer->GetCommentOS() << format("0x%" PRIx64"l" "x" "\n",
2718 CI->getZExtValue());
2719 AP.OutStreamer->EmitIntValue(CI->getZExtValue(), Size);
2720 return;
2721 default:
2722 emitGlobalConstantLargeInt(CI, AP);
2723 return;
2724 }
2725 }
2726
2727 if (const ConstantFP *CFP = dyn_cast<ConstantFP>(CV))
2728 return emitGlobalConstantFP(CFP, AP);
2729
2730 if (isa<ConstantPointerNull>(CV)) {
2731 AP.OutStreamer->EmitIntValue(0, Size);
2732 return;
2733 }
2734
2735 if (const ConstantDataSequential *CDS = dyn_cast<ConstantDataSequential>(CV))
2736 return emitGlobalConstantDataSequential(DL, CDS, AP);
2737
2738 if (const ConstantArray *CVA = dyn_cast<ConstantArray>(CV))
2739 return emitGlobalConstantArray(DL, CVA, AP, BaseCV, Offset);
2740
2741 if (const ConstantStruct *CVS = dyn_cast<ConstantStruct>(CV))
2742 return emitGlobalConstantStruct(DL, CVS, AP, BaseCV, Offset);
2743
2744 if (const ConstantExpr *CE = dyn_cast<ConstantExpr>(CV)) {
2745 // Look through bitcasts, which might not be able to be MCExpr'ized (e.g. of
2746 // vectors).
2747 if (CE->getOpcode() == Instruction::BitCast)
2748 return emitGlobalConstantImpl(DL, CE->getOperand(0), AP);
2749
2750 if (Size > 8) {
2751 // If the constant expression's size is greater than 64-bits, then we have
2752 // to emit the value in chunks. Try to constant fold the value and emit it
2753 // that way.
2754 Constant *New = ConstantFoldConstant(CE, DL);
2755 if (New && New != CE)
2756 return emitGlobalConstantImpl(DL, New, AP);
2757 }
2758 }
2759
2760 if (const ConstantVector *V = dyn_cast<ConstantVector>(CV))
2761 return emitGlobalConstantVector(DL, V, AP);
2762
2763 // Otherwise, it must be a ConstantExpr. Lower it to an MCExpr, then emit it
2764 // thread the streamer with EmitValue.
2765 const MCExpr *ME = AP.lowerConstant(CV);
2766
2767 // Since lowerConstant already folded and got rid of all IR pointer and
2768 // integer casts, detect GOT equivalent accesses by looking into the MCExpr
2769 // directly.
2770 if (AP.getObjFileLowering().supportIndirectSymViaGOTPCRel())
2771 handleIndirectSymViaGOTPCRel(AP, &ME, BaseCV, Offset);
2772
2773 AP.OutStreamer->EmitValue(ME, Size);
2774}
2775
2776/// EmitGlobalConstant - Print a general LLVM constant to the .s file.
2777void AsmPrinter::EmitGlobalConstant(const DataLayout &DL, const Constant *CV) {
2778 uint64_t Size = DL.getTypeAllocSize(CV->getType());
2779 if (Size)
2780 emitGlobalConstantImpl(DL, CV, *this);
2781 else if (MAI->hasSubsectionsViaSymbols()) {
2782 // If the global has zero size, emit a single byte so that two labels don't
2783 // look like they are at the same location.
2784 OutStreamer->EmitIntValue(0, 1);
2785 }
2786}
2787
2788void AsmPrinter::EmitMachineConstantPoolValue(MachineConstantPoolValue *MCPV) {
2789 // Target doesn't support this yet!
2790 llvm_unreachable("Target does not support EmitMachineConstantPoolValue")::llvm::llvm_unreachable_internal("Target does not support EmitMachineConstantPoolValue"
, "/build/llvm-toolchain-snapshot-10~++20200112100611+7fa5290d5bd/llvm/lib/CodeGen/AsmPrinter/AsmPrinter.cpp"
, 2790)
;
2791}
2792
2793void AsmPrinter::printOffset(int64_t Offset, raw_ostream &OS) const {
2794 if (Offset > 0)
2795 OS << '+' << Offset;
2796 else if (Offset < 0)
2797 OS << Offset;
2798}
2799
2800//===----------------------------------------------------------------------===//
2801// Symbol Lowering Routines.
2802//===----------------------------------------------------------------------===//
2803
2804MCSymbol *AsmPrinter::createTempSymbol(const Twine &Name) const {
2805 return OutContext.createTempSymbol(Name, true);
2806}
2807
2808MCSymbol *AsmPrinter::GetBlockAddressSymbol(const BlockAddress *BA) const {
2809 return MMI->getAddrLabelSymbol(BA->getBasicBlock());
2810}
2811
2812MCSymbol *AsmPrinter::GetBlockAddressSymbol(const BasicBlock *BB) const {
2813 return MMI->getAddrLabelSymbol(BB);
2814}
2815
2816/// GetCPISymbol - Return the symbol for the specified constant pool entry.
2817MCSymbol *AsmPrinter::GetCPISymbol(unsigned CPID) const {
2818 if (getSubtargetInfo().getTargetTriple().isWindowsMSVCEnvironment()) {
2819 const MachineConstantPoolEntry &CPE =
2820 MF->getConstantPool()->getConstants()[CPID];
2821 if (!CPE.isMachineConstantPoolEntry()) {
2822 const DataLayout &DL = MF->getDataLayout();
2823 SectionKind Kind = CPE.getSectionKind(&DL);
2824 const Constant *C = CPE.Val.ConstVal;
2825 unsigned Align = CPE.Alignment;
2826 if (const MCSectionCOFF *S = dyn_cast<MCSectionCOFF>(
2827 getObjFileLowering().getSectionForConstant(DL, Kind, C, Align))) {
2828 if (MCSymbol *Sym = S->getCOMDATSymbol()) {
2829 if (Sym->isUndefined())
2830 OutStreamer->EmitSymbolAttribute(Sym, MCSA_Global);
2831 return Sym;
2832 }
2833 }
2834 }
2835 }
2836
2837 const DataLayout &DL = getDataLayout();
2838 return OutContext.getOrCreateSymbol(Twine(DL.getPrivateGlobalPrefix()) +
2839 "CPI" + Twine(getFunctionNumber()) + "_" +
2840 Twine(CPID));
2841}
2842
2843/// GetJTISymbol - Return the symbol for the specified jump table entry.
2844MCSymbol *AsmPrinter::GetJTISymbol(unsigned JTID, bool isLinkerPrivate) const {
2845 return MF->getJTISymbol(JTID, OutContext, isLinkerPrivate);
2846}
2847
2848/// GetJTSetSymbol - Return the symbol for the specified jump table .set
2849/// FIXME: privatize to AsmPrinter.
2850MCSymbol *AsmPrinter::GetJTSetSymbol(unsigned UID, unsigned MBBID) const {
2851 const DataLayout &DL = getDataLayout();
2852 return OutContext.getOrCreateSymbol(Twine(DL.getPrivateGlobalPrefix()) +
2853 Twine(getFunctionNumber()) + "_" +
2854 Twine(UID) + "_set_" + Twine(MBBID));
2855}
2856
2857MCSymbol *AsmPrinter::getSymbolWithGlobalValueBase(const GlobalValue *GV,
2858 StringRef Suffix) const {
2859 return getObjFileLowering().getSymbolWithGlobalValueBase(GV, Suffix, TM);
2860}
2861
2862/// Return the MCSymbol for the specified ExternalSymbol.
2863MCSymbol *AsmPrinter::GetExternalSymbolSymbol(StringRef Sym) const {
2864 SmallString<60> NameStr;
2865 Mangler::getNameWithPrefix(NameStr, Sym, getDataLayout());
2866 return OutContext.getOrCreateSymbol(NameStr);
2867}
2868
2869/// PrintParentLoopComment - Print comments about parent loops of this one.
2870static void PrintParentLoopComment(raw_ostream &OS, const MachineLoop *Loop,
2871 unsigned FunctionNumber) {
2872 if (!Loop) return;
2873 PrintParentLoopComment(OS, Loop->getParentLoop(), FunctionNumber);
2874 OS.indent(Loop->getLoopDepth()*2)
2875 << "Parent Loop BB" << FunctionNumber << "_"
2876 << Loop->getHeader()->getNumber()
2877 << " Depth=" << Loop->getLoopDepth() << '\n';
2878}
2879
2880/// PrintChildLoopComment - Print comments about child loops within
2881/// the loop for this basic block, with nesting.
2882static void PrintChildLoopComment(raw_ostream &OS, const MachineLoop *Loop,
2883 unsigned FunctionNumber) {
2884 // Add child loop information
2885 for (const MachineLoop *CL : *Loop) {
2886 OS.indent(CL->getLoopDepth()*2)
2887 << "Child Loop BB" << FunctionNumber << "_"
2888 << CL->getHeader()->getNumber() << " Depth " << CL->getLoopDepth()
2889 << '\n';
2890 PrintChildLoopComment(OS, CL, FunctionNumber);
2891 }
2892}
2893
2894/// emitBasicBlockLoopComments - Pretty-print comments for basic blocks.
2895static void emitBasicBlockLoopComments(const MachineBasicBlock &MBB,
2896 const MachineLoopInfo *LI,
2897 const AsmPrinter &AP) {
2898 // Add loop depth information
2899 const MachineLoop *Loop = LI->getLoopFor(&MBB);
2900 if (!Loop) return;
2901
2902 MachineBasicBlock *Header = Loop->getHeader();
2903 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~++20200112100611+7fa5290d5bd/llvm/lib/CodeGen/AsmPrinter/AsmPrinter.cpp"
, 2903, __PRETTY_FUNCTION__))
;
2904
2905 // If this block is not a loop header, just print out what is the loop header
2906 // and return.
2907 if (Header != &MBB) {
2908 AP.OutStreamer->AddComment(" in Loop: Header=BB" +
2909 Twine(AP.getFunctionNumber())+"_" +
2910 Twine(Loop->getHeader()->getNumber())+
2911 " Depth="+Twine(Loop->getLoopDepth()));
2912 return;
2913 }
2914
2915 // Otherwise, it is a loop header. Print out information about child and
2916 // parent loops.
2917 raw_ostream &OS = AP.OutStreamer->GetCommentOS();
2918
2919 PrintParentLoopComment(OS, Loop->getParentLoop(), AP.getFunctionNumber());
2920
2921 OS << "=>";
2922 OS.indent(Loop->getLoopDepth()*2-2);
2923
2924 OS << "This ";
2925 if (Loop->empty())
2926 OS << "Inner ";
2927 OS << "Loop Header: Depth=" + Twine(Loop->getLoopDepth()) << '\n';
2928
2929 PrintChildLoopComment(OS, Loop, AP.getFunctionNumber());
2930}
2931
2932/// EmitBasicBlockStart - This method prints the label for the specified
2933/// MachineBasicBlock, an alignment (if present) and a comment describing
2934/// it if appropriate.
2935void AsmPrinter::EmitBasicBlockStart(const MachineBasicBlock &MBB) {
2936 // End the previous funclet and start a new one.
2937 if (MBB.isEHFuncletEntry()) {
2938 for (const HandlerInfo &HI : Handlers) {
2939 HI.Handler->endFunclet();
2940 HI.Handler->beginFunclet(MBB);
2941 }
2942 }
2943
2944 // Emit an alignment directive for this block, if needed.
2945 const Align Alignment = MBB.getAlignment();
2946 if (Alignment != Align::None())
2947 EmitAlignment(Alignment);
2948
2949 // If the block has its address taken, emit any labels that were used to
2950 // reference the block. It is possible that there is more than one label
2951 // here, because multiple LLVM BB's may have been RAUW'd to this block after
2952 // the references were generated.
2953 if (MBB.hasAddressTaken()) {
2954 const BasicBlock *BB = MBB.getBasicBlock();
2955 if (isVerbose())
2956 OutStreamer->AddComment("Block address taken");
2957
2958 // MBBs can have their address taken as part of CodeGen without having
2959 // their corresponding BB's address taken in IR
2960 if (BB->hasAddressTaken())
2961 for (MCSymbol *Sym : MMI->getAddrLabelSymbolToEmit(BB))
2962 OutStreamer->EmitLabel(Sym);
2963 }
2964
2965 // Print some verbose block comments.
2966 if (isVerbose()) {
2967 if (const BasicBlock *BB = MBB.getBasicBlock()) {
2968 if (BB->hasName()) {
2969 BB->printAsOperand(OutStreamer->GetCommentOS(),
2970 /*PrintType=*/false, BB->getModule());
2971 OutStreamer->GetCommentOS() << '\n';
2972 }
2973 }
2974
2975 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~++20200112100611+7fa5290d5bd/llvm/lib/CodeGen/AsmPrinter/AsmPrinter.cpp"
, 2975, __PRETTY_FUNCTION__))
;
2976 emitBasicBlockLoopComments(MBB, MLI, *this);
2977 }
2978
2979 // Print the main label for the block.
2980 if (MBB.pred_empty() ||
2981 (isBlockOnlyReachableByFallthrough(&MBB) && !MBB.isEHFuncletEntry() &&
2982 !MBB.hasLabelMustBeEmitted())) {
2983 if (isVerbose()) {
2984 // NOTE: Want this comment at start of line, don't emit with AddComment.
2985 OutStreamer->emitRawComment(" %bb." + Twine(MBB.getNumber()) + ":",
2986 false);
2987 }
2988 } else {
2989 if (isVerbose() && MBB.hasLabelMustBeEmitted())
2990 OutStreamer->AddComment("Label of block must be emitted");
2991 OutStreamer->EmitLabel(MBB.getSymbol());
2992 }
2993}
2994
2995void AsmPrinter::EmitBasicBlockEnd(const MachineBasicBlock &MBB) {}
2996
2997void AsmPrinter::EmitVisibility(MCSymbol *Sym, unsigned Visibility,
2998 bool IsDefinition) const {
2999 MCSymbolAttr Attr = MCSA_Invalid;
3000
3001 switch (Visibility) {
3002 default: break;
3003 case GlobalValue::HiddenVisibility:
3004 if (IsDefinition)
3005 Attr = MAI->getHiddenVisibilityAttr();
3006 else
3007 Attr = MAI->getHiddenDeclarationVisibilityAttr();
3008 break;
3009 case GlobalValue::ProtectedVisibility:
3010 Attr = MAI->getProtectedVisibilityAttr();
3011 break;
3012 }
3013
3014 if (Attr != MCSA_Invalid)
3015 OutStreamer->EmitSymbolAttribute(Sym, Attr);
3016}
3017
3018/// isBlockOnlyReachableByFallthough - Return true if the basic block has
3019/// exactly one predecessor and the control transfer mechanism between
3020/// the predecessor and this block is a fall-through.
3021bool AsmPrinter::
3022isBlockOnlyReachableByFallthrough(const MachineBasicBlock *MBB) const {
3023 // If this is a landing pad, it isn't a fall through. If it has no preds,
3024 // then nothing falls through to it.
3025 if (MBB->isEHPad() || MBB->pred_empty())
3026 return false;
3027
3028 // If there isn't exactly one predecessor, it can't be a fall through.
3029 if (MBB->pred_size() > 1)
3030 return false;
3031
3032 // The predecessor has to be immediately before this block.
3033 MachineBasicBlock *Pred = *MBB->pred_begin();
3034 if (!Pred->isLayoutSuccessor(MBB))
3035 return false;
3036
3037 // If the block is completely empty, then it definitely does fall through.
3038 if (Pred->empty())
3039 return true;
3040
3041 // Check the terminators in the previous blocks
3042 for (const auto &MI : Pred->terminators()) {
3043 // If it is not a simple branch, we are in a table somewhere.
3044 if (!MI.isBranch() || MI.isIndirectBranch())
3045 return false;
3046
3047 // If we are the operands of one of the branches, this is not a fall
3048 // through. Note that targets with delay slots will usually bundle
3049 // terminators with the delay slot instruction.
3050 for (ConstMIBundleOperands OP(MI); OP.isValid(); ++OP) {
3051 if (OP->isJTI())
3052 return false;
3053 if (OP->isMBB() && OP->getMBB() == MBB)
3054 return false;
3055 }
3056 }
3057
3058 return true;
3059}
3060
3061GCMetadataPrinter *AsmPrinter::GetOrCreateGCPrinter(GCStrategy &S) {
3062 if (!S.usesMetadata())
3063 return nullptr;
3064
3065 gcp_map_type &GCMap = getGCMap(GCMetadataPrinters);
3066 gcp_map_type::iterator GCPI = GCMap.find(&S);
3067 if (GCPI != GCMap.end())
3068 return GCPI->second.get();
3069
3070 auto Name = S.getName();
3071
3072 for (GCMetadataPrinterRegistry::iterator
3073 I = GCMetadataPrinterRegistry::begin(),
3074 E = GCMetadataPrinterRegistry::end(); I != E; ++I)
3075 if (Name == I->getName()) {
3076 std::unique_ptr<GCMetadataPrinter> GMP = I->instantiate();
3077 GMP->S = &S;
3078 auto IterBool = GCMap.insert(std::make_pair(&S, std::move(GMP)));
3079 return IterBool.first->second.get();
3080 }
3081
3082 report_fatal_error("no GCMetadataPrinter registered for GC: " + Twine(Name));
3083}
3084
3085void AsmPrinter::emitStackMaps(StackMaps &SM) {
3086 GCModuleInfo *MI = getAnalysisIfAvailable<GCModuleInfo>();
3087 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~++20200112100611+7fa5290d5bd/llvm/lib/CodeGen/AsmPrinter/AsmPrinter.cpp"
, 3087, __PRETTY_FUNCTION__))
;
3088 bool NeedsDefault = false;
3089 if (MI->begin() == MI->end())
3090 // No GC strategy, use the default format.
3091 NeedsDefault = true;
3092 else
3093 for (auto &I : *MI) {
3094 if (GCMetadataPrinter *MP = GetOrCreateGCPrinter(*I))
3095 if (MP->emitStackMaps(SM, *this))
3096 continue;
3097 // The strategy doesn't have printer or doesn't emit custom stack maps.
3098 // Use the default format.
3099 NeedsDefault = true;
3100 }
3101
3102 if (NeedsDefault)
3103 SM.serializeToStackMapSection();
3104}
3105
3106/// Pin vtable to this file.
3107AsmPrinterHandler::~AsmPrinterHandler() = default;
3108
3109void AsmPrinterHandler::markFunctionEnd() {}
3110
3111// In the binary's "xray_instr_map" section, an array of these function entries
3112// describes each instrumentation point. When XRay patches your code, the index
3113// into this table will be given to your handler as a patch point identifier.
3114void AsmPrinter::XRayFunctionEntry::emit(int Bytes, MCStreamer *Out,
3115 const MCSymbol *CurrentFnSym) const {
3116 Out->EmitSymbolValue(Sled, Bytes);
3117 Out->EmitSymbolValue(CurrentFnSym, Bytes);
3118 auto Kind8 = static_cast<uint8_t>(Kind);
3119 Out->EmitBinaryData(StringRef(reinterpret_cast<const char *>(&Kind8), 1));
3120 Out->EmitBinaryData(
3121 StringRef(reinterpret_cast<const char *>(&AlwaysInstrument), 1));
3122 Out->EmitBinaryData(StringRef(reinterpret_cast<const char *>(&Version), 1));
3123 auto Padding = (4 * Bytes) - ((2 * Bytes) + 3);
3124 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~++20200112100611+7fa5290d5bd/llvm/lib/CodeGen/AsmPrinter/AsmPrinter.cpp"
, 3124, __PRETTY_FUNCTION__))
;
3125 Out->EmitZeros(Padding);
3126}
3127
3128void AsmPrinter::emitXRayTable() {
3129 if (Sleds.empty())
3130 return;
3131
3132 auto PrevSection = OutStreamer->getCurrentSectionOnly();
3133 const Function &F = MF->getFunction();
3134 MCSection *InstMap = nullptr;
3135 MCSection *FnSledIndex = nullptr;
3136 if (MF->getSubtarget().getTargetTriple().isOSBinFormatELF()) {
3137 auto Associated = dyn_cast<MCSymbolELF>(CurrentFnSym);
3138 assert(Associated != nullptr)((Associated != nullptr) ? static_cast<void> (0) : __assert_fail
("Associated != nullptr", "/build/llvm-toolchain-snapshot-10~++20200112100611+7fa5290d5bd/llvm/lib/CodeGen/AsmPrinter/AsmPrinter.cpp"
, 3138, __PRETTY_FUNCTION__))
;
3139 auto Flags = ELF::SHF_WRITE | ELF::SHF_ALLOC | ELF::SHF_LINK_ORDER;
3140 std::string GroupName;
3141 if (F.hasComdat()) {
3142 Flags |= ELF::SHF_GROUP;
3143 GroupName = F.getComdat()->getName();
3144 }
3145
3146 auto UniqueID = ++XRayFnUniqueID;
3147 InstMap =
3148 OutContext.getELFSection("xray_instr_map", ELF::SHT_PROGBITS, Flags, 0,
3149 GroupName, UniqueID, Associated);
3150 FnSledIndex =
3151 OutContext.getELFSection("xray_fn_idx", ELF::SHT_PROGBITS, Flags, 0,
3152 GroupName, UniqueID, Associated);
3153 } else if (MF->getSubtarget().getTargetTriple().isOSBinFormatMachO()) {
3154 InstMap = OutContext.getMachOSection("__DATA", "xray_instr_map", 0,
3155 SectionKind::getReadOnlyWithRel());
3156 FnSledIndex = OutContext.getMachOSection("__DATA", "xray_fn_idx", 0,
3157 SectionKind::getReadOnlyWithRel());
3158 } else {
3159 llvm_unreachable("Unsupported target")::llvm::llvm_unreachable_internal("Unsupported target", "/build/llvm-toolchain-snapshot-10~++20200112100611+7fa5290d5bd/llvm/lib/CodeGen/AsmPrinter/AsmPrinter.cpp"
, 3159)
;
3160 }
3161
3162 auto WordSizeBytes = MAI->getCodePointerSize();
3163
3164 // Now we switch to the instrumentation map section. Because this is done
3165 // per-function, we are able to create an index entry that will represent the
3166 // range of sleds associated with a function.
3167 MCSymbol *SledsStart = OutContext.createTempSymbol("xray_sleds_start", true);
3168 OutStreamer->SwitchSection(InstMap);
3169 OutStreamer->EmitLabel(SledsStart);
3170 for (const auto &Sled : Sleds)
3171 Sled.emit(WordSizeBytes, OutStreamer.get(), CurrentFnSym);
3172 MCSymbol *SledsEnd = OutContext.createTempSymbol("xray_sleds_end", true);
3173 OutStreamer->EmitLabel(SledsEnd);
3174
3175 // We then emit a single entry in the index per function. We use the symbols
3176 // that bound the instrumentation map as the range for a specific function.
3177 // Each entry here will be 2 * word size aligned, as we're writing down two
3178 // pointers. This should work for both 32-bit and 64-bit platforms.
3179 OutStreamer->SwitchSection(FnSledIndex);
3180 OutStreamer->EmitCodeAlignment(2 * WordSizeBytes);
3181 OutStreamer->EmitSymbolValue(SledsStart, WordSizeBytes, false);
3182 OutStreamer->EmitSymbolValue(SledsEnd, WordSizeBytes, false);
3183 OutStreamer->SwitchSection(PrevSection);
3184 Sleds.clear();
3185}
3186
3187void AsmPrinter::recordSled(MCSymbol *Sled, const MachineInstr &MI,
3188 SledKind Kind, uint8_t Version) {
3189 const Function &F = MI.getMF()->getFunction();
3190 auto Attr = F.getFnAttribute("function-instrument");
3191 bool LogArgs = F.hasFnAttribute("xray-log-args");
3192 bool AlwaysInstrument =
3193 Attr.isStringAttribute() && Attr.getValueAsString() == "xray-always";
3194 if (Kind == SledKind::FUNCTION_ENTER && LogArgs)
3195 Kind = SledKind::LOG_ARGS_ENTER;
3196 Sleds.emplace_back(XRayFunctionEntry{Sled, CurrentFnSym, Kind,
3197 AlwaysInstrument, &F, Version});
3198}
3199
3200void AsmPrinter::emitPatchableFunctionEntries() {
3201 const Function &F = MF->getFunction();
3202 if (!F.hasFnAttribute("patchable-function-entry"))
3203 return;
3204 const unsigned PointerSize = getPointerSize();
3205 if (TM.getTargetTriple().isOSBinFormatELF()) {
3206 auto Flags = ELF::SHF_WRITE | ELF::SHF_ALLOC;
3207
3208 // As of binutils 2.33, GNU as does not support section flag "o" or linkage
3209 // field "unique". Use SHF_LINK_ORDER if we are using the integrated
3210 // assembler.
3211 if (MAI->useIntegratedAssembler()) {
3212 Flags |= ELF::SHF_LINK_ORDER;
3213 std::string GroupName;
3214 if (F.hasComdat()) {
3215 Flags |= ELF::SHF_GROUP;
3216 GroupName = F.getComdat()->getName();
3217 }
3218 MCSection *Section = getObjFileLowering().SectionForGlobal(&F, TM);
3219 unsigned UniqueID =
3220 PatchableFunctionEntryID
3221 .try_emplace(Section, PatchableFunctionEntryID.size())
3222 .first->second;
3223 OutStreamer->SwitchSection(OutContext.getELFSection(
3224 "__patchable_function_entries", ELF::SHT_PROGBITS, Flags, 0,
3225 GroupName, UniqueID, cast<MCSymbolELF>(CurrentFnSym)));
3226 } else {
3227 OutStreamer->SwitchSection(OutContext.getELFSection(
3228 "__patchable_function_entries", ELF::SHT_PROGBITS, Flags));
3229 }
3230 EmitAlignment(Align(PointerSize));
3231 OutStreamer->EmitSymbolValue(CurrentFnBegin, PointerSize);
3232 }
3233}
3234
3235uint16_t AsmPrinter::getDwarfVersion() const {
3236 return OutStreamer->getContext().getDwarfVersion();
3237}
3238
3239void AsmPrinter::setDwarfVersion(uint16_t Version) {
3240 OutStreamer->getContext().setDwarfVersion(Version);
3241}