Bug Summary

File:llvm/lib/CodeGen/AsmPrinter/AsmPrinter.cpp
Warning:line 281, column 5
Called C++ object pointer is null

Annotated Source Code

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clang -cc1 -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 -mframe-pointer=none -fmath-errno -fno-rounding-math -mconstructor-aliases -munwind-tables -target-cpu x86-64 -tune-cpu generic -debugger-tuning=gdb -ffunction-sections -fdata-sections -fcoverage-compilation-dir=/build/llvm-toolchain-snapshot-14~++20210926122410+d23fd8ae8906/build-llvm -resource-dir /usr/lib/llvm-14/lib/clang/14.0.0 -D _DEBUG -D _GNU_SOURCE -D __STDC_CONSTANT_MACROS -D __STDC_FORMAT_MACROS -D __STDC_LIMIT_MACROS -I lib/CodeGen/AsmPrinter -I /build/llvm-toolchain-snapshot-14~++20210926122410+d23fd8ae8906/llvm/lib/CodeGen/AsmPrinter -I include -I /build/llvm-toolchain-snapshot-14~++20210926122410+d23fd8ae8906/llvm/include -D NDEBUG -U NDEBUG -internal-isystem /usr/lib/gcc/x86_64-linux-gnu/10/../../../../include/c++/10 -internal-isystem /usr/lib/gcc/x86_64-linux-gnu/10/../../../../include/x86_64-linux-gnu/c++/10 -internal-isystem /usr/lib/gcc/x86_64-linux-gnu/10/../../../../include/c++/10/backward -internal-isystem /usr/lib/llvm-14/lib/clang/14.0.0/include -internal-isystem /usr/local/include -internal-isystem /usr/lib/gcc/x86_64-linux-gnu/10/../../../../x86_64-linux-gnu/include -internal-externc-isystem /usr/include/x86_64-linux-gnu -internal-externc-isystem /include -internal-externc-isystem /usr/include -O2 -Wno-unused-command-line-argument -Wno-unknown-warning-option -Wno-unused-parameter -Wwrite-strings -Wno-missing-field-initializers -Wno-long-long -Wno-maybe-uninitialized -Wno-class-memaccess -Wno-redundant-move -Wno-pessimizing-move -Wno-noexcept-type -Wno-comment -std=c++14 -fdeprecated-macro -fdebug-compilation-dir=/build/llvm-toolchain-snapshot-14~++20210926122410+d23fd8ae8906/build-llvm -ferror-limit 19 -fvisibility-inlines-hidden -fgnuc-version=4.2.1 -fcolor-diagnostics -vectorize-loops -vectorize-slp -analyzer-output=html -analyzer-config stable-report-filename=true -faddrsig -D__GCC_HAVE_DWARF2_CFI_ASM=1 -o /tmp/scan-build-2021-09-26-234817-15343-1 -x c++ /build/llvm-toolchain-snapshot-14~++20210926122410+d23fd8ae8906/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 "PseudoProbePrinter.h"
18#include "WasmException.h"
19#include "WinCFGuard.h"
20#include "WinException.h"
21#include "llvm/ADT/APFloat.h"
22#include "llvm/ADT/APInt.h"
23#include "llvm/ADT/DenseMap.h"
24#include "llvm/ADT/STLExtras.h"
25#include "llvm/ADT/SmallPtrSet.h"
26#include "llvm/ADT/SmallString.h"
27#include "llvm/ADT/SmallVector.h"
28#include "llvm/ADT/Statistic.h"
29#include "llvm/ADT/StringRef.h"
30#include "llvm/ADT/Triple.h"
31#include "llvm/ADT/Twine.h"
32#include "llvm/Analysis/ConstantFolding.h"
33#include "llvm/Analysis/EHPersonalities.h"
34#include "llvm/Analysis/MemoryLocation.h"
35#include "llvm/Analysis/OptimizationRemarkEmitter.h"
36#include "llvm/BinaryFormat/COFF.h"
37#include "llvm/BinaryFormat/Dwarf.h"
38#include "llvm/BinaryFormat/ELF.h"
39#include "llvm/CodeGen/GCMetadata.h"
40#include "llvm/CodeGen/GCMetadataPrinter.h"
41#include "llvm/CodeGen/MachineBasicBlock.h"
42#include "llvm/CodeGen/MachineConstantPool.h"
43#include "llvm/CodeGen/MachineDominators.h"
44#include "llvm/CodeGen/MachineFrameInfo.h"
45#include "llvm/CodeGen/MachineFunction.h"
46#include "llvm/CodeGen/MachineFunctionPass.h"
47#include "llvm/CodeGen/MachineInstr.h"
48#include "llvm/CodeGen/MachineInstrBundle.h"
49#include "llvm/CodeGen/MachineJumpTableInfo.h"
50#include "llvm/CodeGen/MachineLoopInfo.h"
51#include "llvm/CodeGen/MachineMemOperand.h"
52#include "llvm/CodeGen/MachineModuleInfo.h"
53#include "llvm/CodeGen/MachineModuleInfoImpls.h"
54#include "llvm/CodeGen/MachineOperand.h"
55#include "llvm/CodeGen/MachineOptimizationRemarkEmitter.h"
56#include "llvm/CodeGen/StackMaps.h"
57#include "llvm/CodeGen/TargetFrameLowering.h"
58#include "llvm/CodeGen/TargetInstrInfo.h"
59#include "llvm/CodeGen/TargetLowering.h"
60#include "llvm/CodeGen/TargetOpcodes.h"
61#include "llvm/CodeGen/TargetRegisterInfo.h"
62#include "llvm/Config/config.h"
63#include "llvm/IR/BasicBlock.h"
64#include "llvm/IR/Comdat.h"
65#include "llvm/IR/Constant.h"
66#include "llvm/IR/Constants.h"
67#include "llvm/IR/DataLayout.h"
68#include "llvm/IR/DebugInfoMetadata.h"
69#include "llvm/IR/DerivedTypes.h"
70#include "llvm/IR/Function.h"
71#include "llvm/IR/GCStrategy.h"
72#include "llvm/IR/GlobalAlias.h"
73#include "llvm/IR/GlobalIFunc.h"
74#include "llvm/IR/GlobalIndirectSymbol.h"
75#include "llvm/IR/GlobalObject.h"
76#include "llvm/IR/GlobalValue.h"
77#include "llvm/IR/GlobalVariable.h"
78#include "llvm/IR/Instruction.h"
79#include "llvm/IR/Mangler.h"
80#include "llvm/IR/Metadata.h"
81#include "llvm/IR/Module.h"
82#include "llvm/IR/Operator.h"
83#include "llvm/IR/PseudoProbe.h"
84#include "llvm/IR/Type.h"
85#include "llvm/IR/Value.h"
86#include "llvm/MC/MCAsmInfo.h"
87#include "llvm/MC/MCContext.h"
88#include "llvm/MC/MCDirectives.h"
89#include "llvm/MC/MCDwarf.h"
90#include "llvm/MC/MCExpr.h"
91#include "llvm/MC/MCInst.h"
92#include "llvm/MC/MCSection.h"
93#include "llvm/MC/MCSectionCOFF.h"
94#include "llvm/MC/MCSectionELF.h"
95#include "llvm/MC/MCSectionMachO.h"
96#include "llvm/MC/MCSectionXCOFF.h"
97#include "llvm/MC/MCStreamer.h"
98#include "llvm/MC/MCSubtargetInfo.h"
99#include "llvm/MC/MCSymbol.h"
100#include "llvm/MC/MCSymbolELF.h"
101#include "llvm/MC/MCSymbolXCOFF.h"
102#include "llvm/MC/MCTargetOptions.h"
103#include "llvm/MC/MCValue.h"
104#include "llvm/MC/SectionKind.h"
105#include "llvm/Pass.h"
106#include "llvm/Remarks/Remark.h"
107#include "llvm/Remarks/RemarkFormat.h"
108#include "llvm/Remarks/RemarkStreamer.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/FileSystem.h"
115#include "llvm/Support/Format.h"
116#include "llvm/Support/MathExtras.h"
117#include "llvm/Support/Path.h"
118#include "llvm/Support/TargetRegistry.h"
119#include "llvm/Support/Timer.h"
120#include "llvm/Support/raw_ostream.h"
121#include "llvm/Target/TargetLoweringObjectFile.h"
122#include "llvm/Target/TargetMachine.h"
123#include "llvm/Target/TargetOptions.h"
124#include <algorithm>
125#include <cassert>
126#include <cinttypes>
127#include <cstdint>
128#include <iterator>
129#include <limits>
130#include <memory>
131#include <string>
132#include <utility>
133#include <vector>
134
135using namespace llvm;
136
137#define DEBUG_TYPE"asm-printer" "asm-printer"
138
139// FIXME: this option currently only applies to DWARF, and not CodeView, tables
140static cl::opt<bool>
141 DisableDebugInfoPrinting("disable-debug-info-print", cl::Hidden,
142 cl::desc("Disable debug info printing"));
143
144const char DWARFGroupName[] = "dwarf";
145const char DWARFGroupDescription[] = "DWARF Emission";
146const char DbgTimerName[] = "emit";
147const char DbgTimerDescription[] = "Debug Info Emission";
148const char EHTimerName[] = "write_exception";
149const char EHTimerDescription[] = "DWARF Exception Writer";
150const char CFGuardName[] = "Control Flow Guard";
151const char CFGuardDescription[] = "Control Flow Guard";
152const char CodeViewLineTablesGroupName[] = "linetables";
153const char CodeViewLineTablesGroupDescription[] = "CodeView Line Tables";
154const char PPTimerName[] = "emit";
155const char PPTimerDescription[] = "Pseudo Probe Emission";
156const char PPGroupName[] = "pseudo probe";
157const char PPGroupDescription[] = "Pseudo Probe Emission";
158
159STATISTIC(EmittedInsts, "Number of machine instrs printed")static llvm::Statistic EmittedInsts = {"asm-printer", "EmittedInsts"
, "Number of machine instrs printed"}
;
160
161char AsmPrinter::ID = 0;
162
163using gcp_map_type = DenseMap<GCStrategy *, std::unique_ptr<GCMetadataPrinter>>;
164
165static gcp_map_type &getGCMap(void *&P) {
166 if (!P)
167 P = new gcp_map_type();
168 return *(gcp_map_type*)P;
169}
170
171/// getGVAlignment - Return the alignment to use for the specified global
172/// value. This rounds up to the preferred alignment if possible and legal.
173Align AsmPrinter::getGVAlignment(const GlobalObject *GV, const DataLayout &DL,
174 Align InAlign) {
175 Align Alignment;
176 if (const GlobalVariable *GVar = dyn_cast<GlobalVariable>(GV))
177 Alignment = DL.getPreferredAlign(GVar);
178
179 // If InAlign is specified, round it to it.
180 if (InAlign > Alignment)
181 Alignment = InAlign;
182
183 // If the GV has a specified alignment, take it into account.
184 const MaybeAlign GVAlign(GV->getAlignment());
185 if (!GVAlign)
186 return Alignment;
187
188 assert(GVAlign && "GVAlign must be set")(static_cast <bool> (GVAlign && "GVAlign must be set"
) ? void (0) : __assert_fail ("GVAlign && \"GVAlign must be set\""
, "/build/llvm-toolchain-snapshot-14~++20210926122410+d23fd8ae8906/llvm/lib/CodeGen/AsmPrinter/AsmPrinter.cpp"
, 188, __extension__ __PRETTY_FUNCTION__))
;
189
190 // If the GVAlign is larger than NumBits, or if we are required to obey
191 // NumBits because the GV has an assigned section, obey it.
192 if (*GVAlign > Alignment || GV->hasSection())
193 Alignment = *GVAlign;
194 return Alignment;
195}
196
197AsmPrinter::AsmPrinter(TargetMachine &tm, std::unique_ptr<MCStreamer> Streamer)
198 : MachineFunctionPass(ID), TM(tm), MAI(tm.getMCAsmInfo()),
199 OutContext(Streamer->getContext()), OutStreamer(std::move(Streamer)) {
200 VerboseAsm = OutStreamer->isVerboseAsm();
201}
202
203AsmPrinter::~AsmPrinter() {
204 assert(!DD && Handlers.size() == NumUserHandlers &&(static_cast <bool> (!DD && Handlers.size() == NumUserHandlers
&& "Debug/EH info didn't get finalized") ? void (0) :
__assert_fail ("!DD && Handlers.size() == NumUserHandlers && \"Debug/EH info didn't get finalized\""
, "/build/llvm-toolchain-snapshot-14~++20210926122410+d23fd8ae8906/llvm/lib/CodeGen/AsmPrinter/AsmPrinter.cpp"
, 205, __extension__ __PRETTY_FUNCTION__))
205 "Debug/EH info didn't get finalized")(static_cast <bool> (!DD && Handlers.size() == NumUserHandlers
&& "Debug/EH info didn't get finalized") ? void (0) :
__assert_fail ("!DD && Handlers.size() == NumUserHandlers && \"Debug/EH info didn't get finalized\""
, "/build/llvm-toolchain-snapshot-14~++20210926122410+d23fd8ae8906/llvm/lib/CodeGen/AsmPrinter/AsmPrinter.cpp"
, 205, __extension__ __PRETTY_FUNCTION__))
;
206
207 if (GCMetadataPrinters) {
208 gcp_map_type &GCMap = getGCMap(GCMetadataPrinters);
209
210 delete &GCMap;
211 GCMetadataPrinters = nullptr;
212 }
213}
214
215bool AsmPrinter::isPositionIndependent() const {
216 return TM.isPositionIndependent();
217}
218
219/// getFunctionNumber - Return a unique ID for the current function.
220unsigned AsmPrinter::getFunctionNumber() const {
221 return MF->getFunctionNumber();
222}
223
224const TargetLoweringObjectFile &AsmPrinter::getObjFileLowering() const {
225 return *TM.getObjFileLowering();
226}
227
228const DataLayout &AsmPrinter::getDataLayout() const {
229 return MMI->getModule()->getDataLayout();
230}
231
232// Do not use the cached DataLayout because some client use it without a Module
233// (dsymutil, llvm-dwarfdump).
234unsigned AsmPrinter::getPointerSize() const {
235 return TM.getPointerSize(0); // FIXME: Default address space
236}
237
238const MCSubtargetInfo &AsmPrinter::getSubtargetInfo() const {
239 assert(MF && "getSubtargetInfo requires a valid MachineFunction!")(static_cast <bool> (MF && "getSubtargetInfo requires a valid MachineFunction!"
) ? void (0) : __assert_fail ("MF && \"getSubtargetInfo requires a valid MachineFunction!\""
, "/build/llvm-toolchain-snapshot-14~++20210926122410+d23fd8ae8906/llvm/lib/CodeGen/AsmPrinter/AsmPrinter.cpp"
, 239, __extension__ __PRETTY_FUNCTION__))
;
240 return MF->getSubtarget<MCSubtargetInfo>();
241}
242
243void AsmPrinter::EmitToStreamer(MCStreamer &S, const MCInst &Inst) {
244 S.emitInstruction(Inst, getSubtargetInfo());
245}
246
247void AsmPrinter::emitInitialRawDwarfLocDirective(const MachineFunction &MF) {
248 if (DD) {
249 assert(OutStreamer->hasRawTextSupport() &&(static_cast <bool> (OutStreamer->hasRawTextSupport(
) && "Expected assembly output mode.") ? void (0) : __assert_fail
("OutStreamer->hasRawTextSupport() && \"Expected assembly output mode.\""
, "/build/llvm-toolchain-snapshot-14~++20210926122410+d23fd8ae8906/llvm/lib/CodeGen/AsmPrinter/AsmPrinter.cpp"
, 250, __extension__ __PRETTY_FUNCTION__))
250 "Expected assembly output mode.")(static_cast <bool> (OutStreamer->hasRawTextSupport(
) && "Expected assembly output mode.") ? void (0) : __assert_fail
("OutStreamer->hasRawTextSupport() && \"Expected assembly output mode.\""
, "/build/llvm-toolchain-snapshot-14~++20210926122410+d23fd8ae8906/llvm/lib/CodeGen/AsmPrinter/AsmPrinter.cpp"
, 250, __extension__ __PRETTY_FUNCTION__))
;
251 (void)DD->emitInitialLocDirective(MF, /*CUID=*/0);
252 }
253}
254
255/// getCurrentSection() - Return the current section we are emitting to.
256const MCSection *AsmPrinter::getCurrentSection() const {
257 return OutStreamer->getCurrentSectionOnly();
258}
259
260void AsmPrinter::getAnalysisUsage(AnalysisUsage &AU) const {
261 AU.setPreservesAll();
262 MachineFunctionPass::getAnalysisUsage(AU);
263 AU.addRequired<MachineOptimizationRemarkEmitterPass>();
264 AU.addRequired<GCModuleInfo>();
265}
266
267bool AsmPrinter::doInitialization(Module &M) {
268 auto *MMIWP = getAnalysisIfAvailable<MachineModuleInfoWrapperPass>();
269 MMI = MMIWP
0.1
'MMIWP' is null
? &MMIWP->getMMI() : nullptr
;
1
'?' condition is false
2
Null pointer value stored to field 'MMI'
270
271 // Initialize TargetLoweringObjectFile.
272 const_cast<TargetLoweringObjectFile&>(getObjFileLowering())
273 .Initialize(OutContext, TM);
274
275 const_cast<TargetLoweringObjectFile &>(getObjFileLowering())
276 .getModuleMetadata(M);
277
278 OutStreamer->initSections(false, *TM.getMCSubtargetInfo());
279
280 if (DisableDebugInfoPrinting)
3
Assuming the condition is true
4
Taking true branch
281 MMI->setDebugInfoAvailability(false);
5
Called C++ object pointer is null
282
283 // Emit the version-min deployment target directive if needed.
284 //
285 // FIXME: If we end up with a collection of these sorts of Darwin-specific
286 // or ELF-specific things, it may make sense to have a platform helper class
287 // that will work with the target helper class. For now keep it here, as the
288 // alternative is duplicated code in each of the target asm printers that
289 // use the directive, where it would need the same conditionalization
290 // anyway.
291 const Triple &Target = TM.getTargetTriple();
292 OutStreamer->emitVersionForTarget(Target, M.getSDKVersion());
293
294 // Allow the target to emit any magic that it wants at the start of the file.
295 emitStartOfAsmFile(M);
296
297 // Very minimal debug info. It is ignored if we emit actual debug info. If we
298 // don't, this at least helps the user find where a global came from.
299 if (MAI->hasSingleParameterDotFile()) {
300 // .file "foo.c"
301
302 SmallString<128> FileName;
303 if (MAI->hasBasenameOnlyForFileDirective())
304 FileName = llvm::sys::path::filename(M.getSourceFileName());
305 else
306 FileName = M.getSourceFileName();
307 if (MAI->hasFourStringsDotFile()) {
308#ifdef PACKAGE_VENDOR
309 const char VerStr[] =
310 PACKAGE_VENDOR " " PACKAGE_NAME"LLVM" " version " PACKAGE_VERSION"14.0.0";
311#else
312 const char VerStr[] = PACKAGE_NAME"LLVM" " version " PACKAGE_VERSION"14.0.0";
313#endif
314 // TODO: Add timestamp and description.
315 OutStreamer->emitFileDirective(FileName, VerStr, "", "");
316 } else {
317 OutStreamer->emitFileDirective(FileName);
318 }
319 }
320
321 GCModuleInfo *MI = getAnalysisIfAvailable<GCModuleInfo>();
322 assert(MI && "AsmPrinter didn't require GCModuleInfo?")(static_cast <bool> (MI && "AsmPrinter didn't require GCModuleInfo?"
) ? void (0) : __assert_fail ("MI && \"AsmPrinter didn't require GCModuleInfo?\""
, "/build/llvm-toolchain-snapshot-14~++20210926122410+d23fd8ae8906/llvm/lib/CodeGen/AsmPrinter/AsmPrinter.cpp"
, 322, __extension__ __PRETTY_FUNCTION__))
;
323 for (auto &I : *MI)
324 if (GCMetadataPrinter *MP = GetOrCreateGCPrinter(*I))
325 MP->beginAssembly(M, *MI, *this);
326
327 // Emit module-level inline asm if it exists.
328 if (!M.getModuleInlineAsm().empty()) {
329 OutStreamer->AddComment("Start of file scope inline assembly");
330 OutStreamer->AddBlankLine();
331 emitInlineAsm(M.getModuleInlineAsm() + "\n", *TM.getMCSubtargetInfo(),
332 TM.Options.MCOptions);
333 OutStreamer->AddComment("End of file scope inline assembly");
334 OutStreamer->AddBlankLine();
335 }
336
337 if (MAI->doesSupportDebugInformation()) {
338 bool EmitCodeView = M.getCodeViewFlag();
339 if (EmitCodeView && TM.getTargetTriple().isOSWindows()) {
340 Handlers.emplace_back(std::make_unique<CodeViewDebug>(this),
341 DbgTimerName, DbgTimerDescription,
342 CodeViewLineTablesGroupName,
343 CodeViewLineTablesGroupDescription);
344 }
345 if (!EmitCodeView || M.getDwarfVersion()) {
346 if (!DisableDebugInfoPrinting) {
347 DD = new DwarfDebug(this);
348 Handlers.emplace_back(std::unique_ptr<DwarfDebug>(DD), DbgTimerName,
349 DbgTimerDescription, DWARFGroupName,
350 DWARFGroupDescription);
351 }
352 }
353 }
354
355 if (M.getNamedMetadata(PseudoProbeDescMetadataName)) {
356 PP = new PseudoProbeHandler(this);
357 Handlers.emplace_back(std::unique_ptr<PseudoProbeHandler>(PP), PPTimerName,
358 PPTimerDescription, PPGroupName, PPGroupDescription);
359 }
360
361 switch (MAI->getExceptionHandlingType()) {
362 case ExceptionHandling::None:
363 // We may want to emit CFI for debug.
364 LLVM_FALLTHROUGH[[gnu::fallthrough]];
365 case ExceptionHandling::SjLj:
366 case ExceptionHandling::DwarfCFI:
367 case ExceptionHandling::ARM:
368 for (auto &F : M.getFunctionList()) {
369 if (getFunctionCFISectionType(F) != CFISection::None)
370 ModuleCFISection = getFunctionCFISectionType(F);
371 // If any function needsUnwindTableEntry(), it needs .eh_frame and hence
372 // the module needs .eh_frame. If we have found that case, we are done.
373 if (ModuleCFISection == CFISection::EH)
374 break;
375 }
376 assert(MAI->getExceptionHandlingType() == ExceptionHandling::DwarfCFI ||(static_cast <bool> (MAI->getExceptionHandlingType()
== ExceptionHandling::DwarfCFI || ModuleCFISection != CFISection
::EH) ? void (0) : __assert_fail ("MAI->getExceptionHandlingType() == ExceptionHandling::DwarfCFI || ModuleCFISection != CFISection::EH"
, "/build/llvm-toolchain-snapshot-14~++20210926122410+d23fd8ae8906/llvm/lib/CodeGen/AsmPrinter/AsmPrinter.cpp"
, 377, __extension__ __PRETTY_FUNCTION__))
377 ModuleCFISection != CFISection::EH)(static_cast <bool> (MAI->getExceptionHandlingType()
== ExceptionHandling::DwarfCFI || ModuleCFISection != CFISection
::EH) ? void (0) : __assert_fail ("MAI->getExceptionHandlingType() == ExceptionHandling::DwarfCFI || ModuleCFISection != CFISection::EH"
, "/build/llvm-toolchain-snapshot-14~++20210926122410+d23fd8ae8906/llvm/lib/CodeGen/AsmPrinter/AsmPrinter.cpp"
, 377, __extension__ __PRETTY_FUNCTION__))
;
378 break;
379 default:
380 break;
381 }
382
383 EHStreamer *ES = nullptr;
384 switch (MAI->getExceptionHandlingType()) {
385 case ExceptionHandling::None:
386 if (!needsCFIForDebug())
387 break;
388 LLVM_FALLTHROUGH[[gnu::fallthrough]];
389 case ExceptionHandling::SjLj:
390 case ExceptionHandling::DwarfCFI:
391 ES = new DwarfCFIException(this);
392 break;
393 case ExceptionHandling::ARM:
394 ES = new ARMException(this);
395 break;
396 case ExceptionHandling::WinEH:
397 switch (MAI->getWinEHEncodingType()) {
398 default: llvm_unreachable("unsupported unwinding information encoding")::llvm::llvm_unreachable_internal("unsupported unwinding information encoding"
, "/build/llvm-toolchain-snapshot-14~++20210926122410+d23fd8ae8906/llvm/lib/CodeGen/AsmPrinter/AsmPrinter.cpp"
, 398)
;
399 case WinEH::EncodingType::Invalid:
400 break;
401 case WinEH::EncodingType::X86:
402 case WinEH::EncodingType::Itanium:
403 ES = new WinException(this);
404 break;
405 }
406 break;
407 case ExceptionHandling::Wasm:
408 ES = new WasmException(this);
409 break;
410 case ExceptionHandling::AIX:
411 ES = new AIXException(this);
412 break;
413 }
414 if (ES)
415 Handlers.emplace_back(std::unique_ptr<EHStreamer>(ES), EHTimerName,
416 EHTimerDescription, DWARFGroupName,
417 DWARFGroupDescription);
418
419 // Emit tables for any value of cfguard flag (i.e. cfguard=1 or cfguard=2).
420 if (mdconst::extract_or_null<ConstantInt>(M.getModuleFlag("cfguard")))
421 Handlers.emplace_back(std::make_unique<WinCFGuard>(this), CFGuardName,
422 CFGuardDescription, DWARFGroupName,
423 DWARFGroupDescription);
424
425 for (const HandlerInfo &HI : Handlers) {
426 NamedRegionTimer T(HI.TimerName, HI.TimerDescription, HI.TimerGroupName,
427 HI.TimerGroupDescription, TimePassesIsEnabled);
428 HI.Handler->beginModule(&M);
429 }
430
431 return false;
432}
433
434static bool canBeHidden(const GlobalValue *GV, const MCAsmInfo &MAI) {
435 if (!MAI.hasWeakDefCanBeHiddenDirective())
436 return false;
437
438 return GV->canBeOmittedFromSymbolTable();
439}
440
441void AsmPrinter::emitLinkage(const GlobalValue *GV, MCSymbol *GVSym) const {
442 GlobalValue::LinkageTypes Linkage = GV->getLinkage();
443 switch (Linkage) {
444 case GlobalValue::CommonLinkage:
445 case GlobalValue::LinkOnceAnyLinkage:
446 case GlobalValue::LinkOnceODRLinkage:
447 case GlobalValue::WeakAnyLinkage:
448 case GlobalValue::WeakODRLinkage:
449 if (MAI->hasWeakDefDirective()) {
450 // .globl _foo
451 OutStreamer->emitSymbolAttribute(GVSym, MCSA_Global);
452
453 if (!canBeHidden(GV, *MAI))
454 // .weak_definition _foo
455 OutStreamer->emitSymbolAttribute(GVSym, MCSA_WeakDefinition);
456 else
457 OutStreamer->emitSymbolAttribute(GVSym, MCSA_WeakDefAutoPrivate);
458 } else if (MAI->avoidWeakIfComdat() && GV->hasComdat()) {
459 // .globl _foo
460 OutStreamer->emitSymbolAttribute(GVSym, MCSA_Global);
461 //NOTE: linkonce is handled by the section the symbol was assigned to.
462 } else {
463 // .weak _foo
464 OutStreamer->emitSymbolAttribute(GVSym, MCSA_Weak);
465 }
466 return;
467 case GlobalValue::ExternalLinkage:
468 OutStreamer->emitSymbolAttribute(GVSym, MCSA_Global);
469 return;
470 case GlobalValue::PrivateLinkage:
471 case GlobalValue::InternalLinkage:
472 return;
473 case GlobalValue::ExternalWeakLinkage:
474 case GlobalValue::AvailableExternallyLinkage:
475 case GlobalValue::AppendingLinkage:
476 llvm_unreachable("Should never emit this")::llvm::llvm_unreachable_internal("Should never emit this", "/build/llvm-toolchain-snapshot-14~++20210926122410+d23fd8ae8906/llvm/lib/CodeGen/AsmPrinter/AsmPrinter.cpp"
, 476)
;
477 }
478 llvm_unreachable("Unknown linkage type!")::llvm::llvm_unreachable_internal("Unknown linkage type!", "/build/llvm-toolchain-snapshot-14~++20210926122410+d23fd8ae8906/llvm/lib/CodeGen/AsmPrinter/AsmPrinter.cpp"
, 478)
;
479}
480
481void AsmPrinter::getNameWithPrefix(SmallVectorImpl<char> &Name,
482 const GlobalValue *GV) const {
483 TM.getNameWithPrefix(Name, GV, getObjFileLowering().getMangler());
484}
485
486MCSymbol *AsmPrinter::getSymbol(const GlobalValue *GV) const {
487 return TM.getSymbol(GV);
488}
489
490MCSymbol *AsmPrinter::getSymbolPreferLocal(const GlobalValue &GV) const {
491 // On ELF, use .Lfoo$local if GV is a non-interposable GlobalObject with an
492 // exact definion (intersection of GlobalValue::hasExactDefinition() and
493 // !isInterposable()). These linkages include: external, appending, internal,
494 // private. It may be profitable to use a local alias for external. The
495 // assembler would otherwise be conservative and assume a global default
496 // visibility symbol can be interposable, even if the code generator already
497 // assumed it.
498 if (TM.getTargetTriple().isOSBinFormatELF() && GV.canBenefitFromLocalAlias()) {
499 const Module &M = *GV.getParent();
500 if (TM.getRelocationModel() != Reloc::Static &&
501 M.getPIELevel() == PIELevel::Default && GV.isDSOLocal())
502 return getSymbolWithGlobalValueBase(&GV, "$local");
503 }
504 return TM.getSymbol(&GV);
505}
506
507/// EmitGlobalVariable - Emit the specified global variable to the .s file.
508void AsmPrinter::emitGlobalVariable(const GlobalVariable *GV) {
509 bool IsEmuTLSVar = TM.useEmulatedTLS() && GV->isThreadLocal();
510 assert(!(IsEmuTLSVar && GV->hasCommonLinkage()) &&(static_cast <bool> (!(IsEmuTLSVar && GV->hasCommonLinkage
()) && "No emulated TLS variables in the common section"
) ? void (0) : __assert_fail ("!(IsEmuTLSVar && GV->hasCommonLinkage()) && \"No emulated TLS variables in the common section\""
, "/build/llvm-toolchain-snapshot-14~++20210926122410+d23fd8ae8906/llvm/lib/CodeGen/AsmPrinter/AsmPrinter.cpp"
, 511, __extension__ __PRETTY_FUNCTION__))
511 "No emulated TLS variables in the common section")(static_cast <bool> (!(IsEmuTLSVar && GV->hasCommonLinkage
()) && "No emulated TLS variables in the common section"
) ? void (0) : __assert_fail ("!(IsEmuTLSVar && GV->hasCommonLinkage()) && \"No emulated TLS variables in the common section\""
, "/build/llvm-toolchain-snapshot-14~++20210926122410+d23fd8ae8906/llvm/lib/CodeGen/AsmPrinter/AsmPrinter.cpp"
, 511, __extension__ __PRETTY_FUNCTION__))
;
512
513 // Never emit TLS variable xyz in emulated TLS model.
514 // The initialization value is in __emutls_t.xyz instead of xyz.
515 if (IsEmuTLSVar)
516 return;
517
518 if (GV->hasInitializer()) {
519 // Check to see if this is a special global used by LLVM, if so, emit it.
520 if (emitSpecialLLVMGlobal(GV))
521 return;
522
523 // Skip the emission of global equivalents. The symbol can be emitted later
524 // on by emitGlobalGOTEquivs in case it turns out to be needed.
525 if (GlobalGOTEquivs.count(getSymbol(GV)))
526 return;
527
528 if (isVerbose()) {
529 // When printing the control variable __emutls_v.*,
530 // we don't need to print the original TLS variable name.
531 GV->printAsOperand(OutStreamer->GetCommentOS(),
532 /*PrintType=*/false, GV->getParent());
533 OutStreamer->GetCommentOS() << '\n';
534 }
535 }
536
537 MCSymbol *GVSym = getSymbol(GV);
538 MCSymbol *EmittedSym = GVSym;
539
540 // getOrCreateEmuTLSControlSym only creates the symbol with name and default
541 // attributes.
542 // GV's or GVSym's attributes will be used for the EmittedSym.
543 emitVisibility(EmittedSym, GV->getVisibility(), !GV->isDeclaration());
544
545 if (!GV->hasInitializer()) // External globals require no extra code.
546 return;
547
548 GVSym->redefineIfPossible();
549 if (GVSym->isDefined() || GVSym->isVariable())
550 OutContext.reportError(SMLoc(), "symbol '" + Twine(GVSym->getName()) +
551 "' is already defined");
552
553 if (MAI->hasDotTypeDotSizeDirective())
554 OutStreamer->emitSymbolAttribute(EmittedSym, MCSA_ELF_TypeObject);
555
556 SectionKind GVKind = TargetLoweringObjectFile::getKindForGlobal(GV, TM);
557
558 const DataLayout &DL = GV->getParent()->getDataLayout();
559 uint64_t Size = DL.getTypeAllocSize(GV->getValueType());
560
561 // If the alignment is specified, we *must* obey it. Overaligning a global
562 // with a specified alignment is a prompt way to break globals emitted to
563 // sections and expected to be contiguous (e.g. ObjC metadata).
564 const Align Alignment = getGVAlignment(GV, DL);
565
566 for (const HandlerInfo &HI : Handlers) {
567 NamedRegionTimer T(HI.TimerName, HI.TimerDescription,
568 HI.TimerGroupName, HI.TimerGroupDescription,
569 TimePassesIsEnabled);
570 HI.Handler->setSymbolSize(GVSym, Size);
571 }
572
573 // Handle common symbols
574 if (GVKind.isCommon()) {
575 if (Size == 0) Size = 1; // .comm Foo, 0 is undefined, avoid it.
576 // .comm _foo, 42, 4
577 const bool SupportsAlignment =
578 getObjFileLowering().getCommDirectiveSupportsAlignment();
579 OutStreamer->emitCommonSymbol(GVSym, Size,
580 SupportsAlignment ? Alignment.value() : 0);
581 return;
582 }
583
584 // Determine to which section this global should be emitted.
585 MCSection *TheSection = getObjFileLowering().SectionForGlobal(GV, GVKind, TM);
586
587 // If we have a bss global going to a section that supports the
588 // zerofill directive, do so here.
589 if (GVKind.isBSS() && MAI->hasMachoZeroFillDirective() &&
590 TheSection->isVirtualSection()) {
591 if (Size == 0)
592 Size = 1; // zerofill of 0 bytes is undefined.
593 emitLinkage(GV, GVSym);
594 // .zerofill __DATA, __bss, _foo, 400, 5
595 OutStreamer->emitZerofill(TheSection, GVSym, Size, Alignment.value());
596 return;
597 }
598
599 // If this is a BSS local symbol and we are emitting in the BSS
600 // section use .lcomm/.comm directive.
601 if (GVKind.isBSSLocal() &&
602 getObjFileLowering().getBSSSection() == TheSection) {
603 if (Size == 0)
604 Size = 1; // .comm Foo, 0 is undefined, avoid it.
605
606 // Use .lcomm only if it supports user-specified alignment.
607 // Otherwise, while it would still be correct to use .lcomm in some
608 // cases (e.g. when Align == 1), the external assembler might enfore
609 // some -unknown- default alignment behavior, which could cause
610 // spurious differences between external and integrated assembler.
611 // Prefer to simply fall back to .local / .comm in this case.
612 if (MAI->getLCOMMDirectiveAlignmentType() != LCOMM::NoAlignment) {
613 // .lcomm _foo, 42
614 OutStreamer->emitLocalCommonSymbol(GVSym, Size, Alignment.value());
615 return;
616 }
617
618 // .local _foo
619 OutStreamer->emitSymbolAttribute(GVSym, MCSA_Local);
620 // .comm _foo, 42, 4
621 const bool SupportsAlignment =
622 getObjFileLowering().getCommDirectiveSupportsAlignment();
623 OutStreamer->emitCommonSymbol(GVSym, Size,
624 SupportsAlignment ? Alignment.value() : 0);
625 return;
626 }
627
628 // Handle thread local data for mach-o which requires us to output an
629 // additional structure of data and mangle the original symbol so that we
630 // can reference it later.
631 //
632 // TODO: This should become an "emit thread local global" method on TLOF.
633 // All of this macho specific stuff should be sunk down into TLOFMachO and
634 // stuff like "TLSExtraDataSection" should no longer be part of the parent
635 // TLOF class. This will also make it more obvious that stuff like
636 // MCStreamer::EmitTBSSSymbol is macho specific and only called from macho
637 // specific code.
638 if (GVKind.isThreadLocal() && MAI->hasMachoTBSSDirective()) {
639 // Emit the .tbss symbol
640 MCSymbol *MangSym =
641 OutContext.getOrCreateSymbol(GVSym->getName() + Twine("$tlv$init"));
642
643 if (GVKind.isThreadBSS()) {
644 TheSection = getObjFileLowering().getTLSBSSSection();
645 OutStreamer->emitTBSSSymbol(TheSection, MangSym, Size, Alignment.value());
646 } else if (GVKind.isThreadData()) {
647 OutStreamer->SwitchSection(TheSection);
648
649 emitAlignment(Alignment, GV);
650 OutStreamer->emitLabel(MangSym);
651
652 emitGlobalConstant(GV->getParent()->getDataLayout(),
653 GV->getInitializer());
654 }
655
656 OutStreamer->AddBlankLine();
657
658 // Emit the variable struct for the runtime.
659 MCSection *TLVSect = getObjFileLowering().getTLSExtraDataSection();
660
661 OutStreamer->SwitchSection(TLVSect);
662 // Emit the linkage here.
663 emitLinkage(GV, GVSym);
664 OutStreamer->emitLabel(GVSym);
665
666 // Three pointers in size:
667 // - __tlv_bootstrap - used to make sure support exists
668 // - spare pointer, used when mapped by the runtime
669 // - pointer to mangled symbol above with initializer
670 unsigned PtrSize = DL.getPointerTypeSize(GV->getType());
671 OutStreamer->emitSymbolValue(GetExternalSymbolSymbol("_tlv_bootstrap"),
672 PtrSize);
673 OutStreamer->emitIntValue(0, PtrSize);
674 OutStreamer->emitSymbolValue(MangSym, PtrSize);
675
676 OutStreamer->AddBlankLine();
677 return;
678 }
679
680 MCSymbol *EmittedInitSym = GVSym;
681
682 OutStreamer->SwitchSection(TheSection);
683
684 emitLinkage(GV, EmittedInitSym);
685 emitAlignment(Alignment, GV);
686
687 OutStreamer->emitLabel(EmittedInitSym);
688 MCSymbol *LocalAlias = getSymbolPreferLocal(*GV);
689 if (LocalAlias != EmittedInitSym)
690 OutStreamer->emitLabel(LocalAlias);
691
692 emitGlobalConstant(GV->getParent()->getDataLayout(), GV->getInitializer());
693
694 if (MAI->hasDotTypeDotSizeDirective())
695 // .size foo, 42
696 OutStreamer->emitELFSize(EmittedInitSym,
697 MCConstantExpr::create(Size, OutContext));
698
699 OutStreamer->AddBlankLine();
700}
701
702/// Emit the directive and value for debug thread local expression
703///
704/// \p Value - The value to emit.
705/// \p Size - The size of the integer (in bytes) to emit.
706void AsmPrinter::emitDebugValue(const MCExpr *Value, unsigned Size) const {
707 OutStreamer->emitValue(Value, Size);
708}
709
710void AsmPrinter::emitFunctionHeaderComment() {}
711
712/// EmitFunctionHeader - This method emits the header for the current
713/// function.
714void AsmPrinter::emitFunctionHeader() {
715 const Function &F = MF->getFunction();
716
717 if (isVerbose())
718 OutStreamer->GetCommentOS()
719 << "-- Begin function "
720 << GlobalValue::dropLLVMManglingEscape(F.getName()) << '\n';
721
722 // Print out constants referenced by the function
723 emitConstantPool();
724
725 // Print the 'header' of function.
726 // If basic block sections are desired, explicitly request a unique section
727 // for this function's entry block.
728 if (MF->front().isBeginSection())
729 MF->setSection(getObjFileLowering().getUniqueSectionForFunction(F, TM));
730 else
731 MF->setSection(getObjFileLowering().SectionForGlobal(&F, TM));
732 OutStreamer->SwitchSection(MF->getSection());
733
734 if (!MAI->hasVisibilityOnlyWithLinkage())
735 emitVisibility(CurrentFnSym, F.getVisibility());
736
737 if (MAI->needsFunctionDescriptors())
738 emitLinkage(&F, CurrentFnDescSym);
739
740 emitLinkage(&F, CurrentFnSym);
741 if (MAI->hasFunctionAlignment())
742 emitAlignment(MF->getAlignment(), &F);
743
744 if (MAI->hasDotTypeDotSizeDirective())
745 OutStreamer->emitSymbolAttribute(CurrentFnSym, MCSA_ELF_TypeFunction);
746
747 if (F.hasFnAttribute(Attribute::Cold))
748 OutStreamer->emitSymbolAttribute(CurrentFnSym, MCSA_Cold);
749
750 if (isVerbose()) {
751 F.printAsOperand(OutStreamer->GetCommentOS(),
752 /*PrintType=*/false, F.getParent());
753 emitFunctionHeaderComment();
754 OutStreamer->GetCommentOS() << '\n';
755 }
756
757 // Emit the prefix data.
758 if (F.hasPrefixData()) {
759 if (MAI->hasSubsectionsViaSymbols()) {
760 // Preserving prefix data on platforms which use subsections-via-symbols
761 // is a bit tricky. Here we introduce a symbol for the prefix data
762 // and use the .alt_entry attribute to mark the function's real entry point
763 // as an alternative entry point to the prefix-data symbol.
764 MCSymbol *PrefixSym = OutContext.createLinkerPrivateTempSymbol();
765 OutStreamer->emitLabel(PrefixSym);
766
767 emitGlobalConstant(F.getParent()->getDataLayout(), F.getPrefixData());
768
769 // Emit an .alt_entry directive for the actual function symbol.
770 OutStreamer->emitSymbolAttribute(CurrentFnSym, MCSA_AltEntry);
771 } else {
772 emitGlobalConstant(F.getParent()->getDataLayout(), F.getPrefixData());
773 }
774 }
775
776 // Emit M NOPs for -fpatchable-function-entry=N,M where M>0. We arbitrarily
777 // place prefix data before NOPs.
778 unsigned PatchableFunctionPrefix = 0;
779 unsigned PatchableFunctionEntry = 0;
780 (void)F.getFnAttribute("patchable-function-prefix")
781 .getValueAsString()
782 .getAsInteger(10, PatchableFunctionPrefix);
783 (void)F.getFnAttribute("patchable-function-entry")
784 .getValueAsString()
785 .getAsInteger(10, PatchableFunctionEntry);
786 if (PatchableFunctionPrefix) {
787 CurrentPatchableFunctionEntrySym =
788 OutContext.createLinkerPrivateTempSymbol();
789 OutStreamer->emitLabel(CurrentPatchableFunctionEntrySym);
790 emitNops(PatchableFunctionPrefix);
791 } else if (PatchableFunctionEntry) {
792 // May be reassigned when emitting the body, to reference the label after
793 // the initial BTI (AArch64) or endbr32/endbr64 (x86).
794 CurrentPatchableFunctionEntrySym = CurrentFnBegin;
795 }
796
797 // Emit the function descriptor. This is a virtual function to allow targets
798 // to emit their specific function descriptor. Right now it is only used by
799 // the AIX target. The PowerPC 64-bit V1 ELF target also uses function
800 // descriptors and should be converted to use this hook as well.
801 if (MAI->needsFunctionDescriptors())
802 emitFunctionDescriptor();
803
804 // Emit the CurrentFnSym. This is a virtual function to allow targets to do
805 // their wild and crazy things as required.
806 emitFunctionEntryLabel();
807
808 // If the function had address-taken blocks that got deleted, then we have
809 // references to the dangling symbols. Emit them at the start of the function
810 // so that we don't get references to undefined symbols.
811 std::vector<MCSymbol*> DeadBlockSyms;
812 MMI->takeDeletedSymbolsForFunction(&F, DeadBlockSyms);
813 for (unsigned i = 0, e = DeadBlockSyms.size(); i != e; ++i) {
814 OutStreamer->AddComment("Address taken block that was later removed");
815 OutStreamer->emitLabel(DeadBlockSyms[i]);
816 }
817
818 if (CurrentFnBegin) {
819 if (MAI->useAssignmentForEHBegin()) {
820 MCSymbol *CurPos = OutContext.createTempSymbol();
821 OutStreamer->emitLabel(CurPos);
822 OutStreamer->emitAssignment(CurrentFnBegin,
823 MCSymbolRefExpr::create(CurPos, OutContext));
824 } else {
825 OutStreamer->emitLabel(CurrentFnBegin);
826 }
827 }
828
829 // Emit pre-function debug and/or EH information.
830 for (const HandlerInfo &HI : Handlers) {
831 NamedRegionTimer T(HI.TimerName, HI.TimerDescription, HI.TimerGroupName,
832 HI.TimerGroupDescription, TimePassesIsEnabled);
833 HI.Handler->beginFunction(MF);
834 }
835
836 // Emit the prologue data.
837 if (F.hasPrologueData())
838 emitGlobalConstant(F.getParent()->getDataLayout(), F.getPrologueData());
839}
840
841/// EmitFunctionEntryLabel - Emit the label that is the entrypoint for the
842/// function. This can be overridden by targets as required to do custom stuff.
843void AsmPrinter::emitFunctionEntryLabel() {
844 CurrentFnSym->redefineIfPossible();
845
846 // The function label could have already been emitted if two symbols end up
847 // conflicting due to asm renaming. Detect this and emit an error.
848 if (CurrentFnSym->isVariable())
849 report_fatal_error("'" + Twine(CurrentFnSym->getName()) +
850 "' is a protected alias");
851
852 OutStreamer->emitLabel(CurrentFnSym);
853
854 if (TM.getTargetTriple().isOSBinFormatELF()) {
855 MCSymbol *Sym = getSymbolPreferLocal(MF->getFunction());
856 if (Sym != CurrentFnSym)
857 OutStreamer->emitLabel(Sym);
858 }
859}
860
861/// emitComments - Pretty-print comments for instructions.
862static void emitComments(const MachineInstr &MI, raw_ostream &CommentOS) {
863 const MachineFunction *MF = MI.getMF();
864 const TargetInstrInfo *TII = MF->getSubtarget().getInstrInfo();
865
866 // Check for spills and reloads
867
868 // We assume a single instruction only has a spill or reload, not
869 // both.
870 Optional<unsigned> Size;
871 if ((Size = MI.getRestoreSize(TII))) {
872 CommentOS << *Size << "-byte Reload\n";
873 } else if ((Size = MI.getFoldedRestoreSize(TII))) {
874 if (*Size) {
875 if (*Size == unsigned(MemoryLocation::UnknownSize))
876 CommentOS << "Unknown-size Folded Reload\n";
877 else
878 CommentOS << *Size << "-byte Folded Reload\n";
879 }
880 } else if ((Size = MI.getSpillSize(TII))) {
881 CommentOS << *Size << "-byte Spill\n";
882 } else if ((Size = MI.getFoldedSpillSize(TII))) {
883 if (*Size) {
884 if (*Size == unsigned(MemoryLocation::UnknownSize))
885 CommentOS << "Unknown-size Folded Spill\n";
886 else
887 CommentOS << *Size << "-byte Folded Spill\n";
888 }
889 }
890
891 // Check for spill-induced copies
892 if (MI.getAsmPrinterFlag(MachineInstr::ReloadReuse))
893 CommentOS << " Reload Reuse\n";
894}
895
896/// emitImplicitDef - This method emits the specified machine instruction
897/// that is an implicit def.
898void AsmPrinter::emitImplicitDef(const MachineInstr *MI) const {
899 Register RegNo = MI->getOperand(0).getReg();
900
901 SmallString<128> Str;
902 raw_svector_ostream OS(Str);
903 OS << "implicit-def: "
904 << printReg(RegNo, MF->getSubtarget().getRegisterInfo());
905
906 OutStreamer->AddComment(OS.str());
907 OutStreamer->AddBlankLine();
908}
909
910static void emitKill(const MachineInstr *MI, AsmPrinter &AP) {
911 std::string Str;
912 raw_string_ostream OS(Str);
913 OS << "kill:";
914 for (unsigned i = 0, e = MI->getNumOperands(); i != e; ++i) {
915 const MachineOperand &Op = MI->getOperand(i);
916 assert(Op.isReg() && "KILL instruction must have only register operands")(static_cast <bool> (Op.isReg() && "KILL instruction must have only register operands"
) ? void (0) : __assert_fail ("Op.isReg() && \"KILL instruction must have only register operands\""
, "/build/llvm-toolchain-snapshot-14~++20210926122410+d23fd8ae8906/llvm/lib/CodeGen/AsmPrinter/AsmPrinter.cpp"
, 916, __extension__ __PRETTY_FUNCTION__))
;
917 OS << ' ' << (Op.isDef() ? "def " : "killed ")
918 << printReg(Op.getReg(), AP.MF->getSubtarget().getRegisterInfo());
919 }
920 AP.OutStreamer->AddComment(OS.str());
921 AP.OutStreamer->AddBlankLine();
922}
923
924/// emitDebugValueComment - This method handles the target-independent form
925/// of DBG_VALUE, returning true if it was able to do so. A false return
926/// means the target will need to handle MI in EmitInstruction.
927static bool emitDebugValueComment(const MachineInstr *MI, AsmPrinter &AP) {
928 // This code handles only the 4-operand target-independent form.
929 if (MI->isNonListDebugValue() && MI->getNumOperands() != 4)
930 return false;
931
932 SmallString<128> Str;
933 raw_svector_ostream OS(Str);
934 OS << "DEBUG_VALUE: ";
935
936 const DILocalVariable *V = MI->getDebugVariable();
937 if (auto *SP = dyn_cast<DISubprogram>(V->getScope())) {
938 StringRef Name = SP->getName();
939 if (!Name.empty())
940 OS << Name << ":";
941 }
942 OS << V->getName();
943 OS << " <- ";
944
945 const DIExpression *Expr = MI->getDebugExpression();
946 if (Expr->getNumElements()) {
947 OS << '[';
948 ListSeparator LS;
949 for (auto Op : Expr->expr_ops()) {
950 OS << LS << dwarf::OperationEncodingString(Op.getOp());
951 for (unsigned I = 0; I < Op.getNumArgs(); ++I)
952 OS << ' ' << Op.getArg(I);
953 }
954 OS << "] ";
955 }
956
957 // Register or immediate value. Register 0 means undef.
958 for (const MachineOperand &Op : MI->debug_operands()) {
959 if (&Op != MI->debug_operands().begin())
960 OS << ", ";
961 switch (Op.getType()) {
962 case MachineOperand::MO_FPImmediate: {
963 APFloat APF = APFloat(Op.getFPImm()->getValueAPF());
964 Type *ImmTy = Op.getFPImm()->getType();
965 if (ImmTy->isBFloatTy() || ImmTy->isHalfTy() || ImmTy->isFloatTy() ||
966 ImmTy->isDoubleTy()) {
967 OS << APF.convertToDouble();
968 } else {
969 // There is no good way to print long double. Convert a copy to
970 // double. Ah well, it's only a comment.
971 bool ignored;
972 APF.convert(APFloat::IEEEdouble(), APFloat::rmNearestTiesToEven,
973 &ignored);
974 OS << "(long double) " << APF.convertToDouble();
975 }
976 break;
977 }
978 case MachineOperand::MO_Immediate: {
979 OS << Op.getImm();
980 break;
981 }
982 case MachineOperand::MO_CImmediate: {
983 Op.getCImm()->getValue().print(OS, false /*isSigned*/);
984 break;
985 }
986 case MachineOperand::MO_TargetIndex: {
987 OS << "!target-index(" << Op.getIndex() << "," << Op.getOffset() << ")";
988 // NOTE: Want this comment at start of line, don't emit with AddComment.
989 AP.OutStreamer->emitRawComment(OS.str());
990 break;
991 }
992 case MachineOperand::MO_Register:
993 case MachineOperand::MO_FrameIndex: {
994 Register Reg;
995 Optional<StackOffset> Offset;
996 if (Op.isReg()) {
997 Reg = Op.getReg();
998 } else {
999 const TargetFrameLowering *TFI =
1000 AP.MF->getSubtarget().getFrameLowering();
1001 Offset = TFI->getFrameIndexReference(*AP.MF, Op.getIndex(), Reg);
1002 }
1003 if (!Reg) {
1004 // Suppress offset, it is not meaningful here.
1005 OS << "undef";
1006 break;
1007 }
1008 // The second operand is only an offset if it's an immediate.
1009 if (MI->isIndirectDebugValue())
1010 Offset = StackOffset::getFixed(MI->getDebugOffset().getImm());
1011 if (Offset)
1012 OS << '[';
1013 OS << printReg(Reg, AP.MF->getSubtarget().getRegisterInfo());
1014 if (Offset)
1015 OS << '+' << Offset->getFixed() << ']';
1016 break;
1017 }
1018 default:
1019 llvm_unreachable("Unknown operand type")::llvm::llvm_unreachable_internal("Unknown operand type", "/build/llvm-toolchain-snapshot-14~++20210926122410+d23fd8ae8906/llvm/lib/CodeGen/AsmPrinter/AsmPrinter.cpp"
, 1019)
;
1020 }
1021 }
1022
1023 // NOTE: Want this comment at start of line, don't emit with AddComment.
1024 AP.OutStreamer->emitRawComment(OS.str());
1025 return true;
1026}
1027
1028/// This method handles the target-independent form of DBG_LABEL, returning
1029/// true if it was able to do so. A false return means the target will need
1030/// to handle MI in EmitInstruction.
1031static bool emitDebugLabelComment(const MachineInstr *MI, AsmPrinter &AP) {
1032 if (MI->getNumOperands() != 1)
1033 return false;
1034
1035 SmallString<128> Str;
1036 raw_svector_ostream OS(Str);
1037 OS << "DEBUG_LABEL: ";
1038
1039 const DILabel *V = MI->getDebugLabel();
1040 if (auto *SP = dyn_cast<DISubprogram>(
1041 V->getScope()->getNonLexicalBlockFileScope())) {
1042 StringRef Name = SP->getName();
1043 if (!Name.empty())
1044 OS << Name << ":";
1045 }
1046 OS << V->getName();
1047
1048 // NOTE: Want this comment at start of line, don't emit with AddComment.
1049 AP.OutStreamer->emitRawComment(OS.str());
1050 return true;
1051}
1052
1053AsmPrinter::CFISection
1054AsmPrinter::getFunctionCFISectionType(const Function &F) const {
1055 // Ignore functions that won't get emitted.
1056 if (F.isDeclarationForLinker())
1057 return CFISection::None;
1058
1059 if (MAI->getExceptionHandlingType() == ExceptionHandling::DwarfCFI &&
1060 F.needsUnwindTableEntry())
1061 return CFISection::EH;
1062
1063 if (MMI->hasDebugInfo() || TM.Options.ForceDwarfFrameSection)
1064 return CFISection::Debug;
1065
1066 return CFISection::None;
1067}
1068
1069AsmPrinter::CFISection
1070AsmPrinter::getFunctionCFISectionType(const MachineFunction &MF) const {
1071 return getFunctionCFISectionType(MF.getFunction());
1072}
1073
1074bool AsmPrinter::needsSEHMoves() {
1075 return MAI->usesWindowsCFI() && MF->getFunction().needsUnwindTableEntry();
1076}
1077
1078bool AsmPrinter::needsCFIForDebug() const {
1079 return MAI->getExceptionHandlingType() == ExceptionHandling::None &&
1080 MAI->doesUseCFIForDebug() && ModuleCFISection == CFISection::Debug;
1081}
1082
1083void AsmPrinter::emitCFIInstruction(const MachineInstr &MI) {
1084 ExceptionHandling ExceptionHandlingType = MAI->getExceptionHandlingType();
1085 if (!needsCFIForDebug() &&
1086 ExceptionHandlingType != ExceptionHandling::DwarfCFI &&
1087 ExceptionHandlingType != ExceptionHandling::ARM)
1088 return;
1089
1090 if (getFunctionCFISectionType(*MF) == CFISection::None)
1091 return;
1092
1093 // If there is no "real" instruction following this CFI instruction, skip
1094 // emitting it; it would be beyond the end of the function's FDE range.
1095 auto *MBB = MI.getParent();
1096 auto I = std::next(MI.getIterator());
1097 while (I != MBB->end() && I->isTransient())
1098 ++I;
1099 if (I == MBB->instr_end() &&
1100 MBB->getReverseIterator() == MBB->getParent()->rbegin())
1101 return;
1102
1103 const std::vector<MCCFIInstruction> &Instrs = MF->getFrameInstructions();
1104 unsigned CFIIndex = MI.getOperand(0).getCFIIndex();
1105 const MCCFIInstruction &CFI = Instrs[CFIIndex];
1106 emitCFIInstruction(CFI);
1107}
1108
1109void AsmPrinter::emitFrameAlloc(const MachineInstr &MI) {
1110 // The operands are the MCSymbol and the frame offset of the allocation.
1111 MCSymbol *FrameAllocSym = MI.getOperand(0).getMCSymbol();
1112 int FrameOffset = MI.getOperand(1).getImm();
1113
1114 // Emit a symbol assignment.
1115 OutStreamer->emitAssignment(FrameAllocSym,
1116 MCConstantExpr::create(FrameOffset, OutContext));
1117}
1118
1119/// Returns the BB metadata to be emitted in the .llvm_bb_addr_map section for a
1120/// given basic block. This can be used to capture more precise profile
1121/// information. We use the last 4 bits (LSBs) to encode the following
1122/// information:
1123/// * (1): set if return block (ret or tail call).
1124/// * (2): set if ends with a tail call.
1125/// * (3): set if exception handling (EH) landing pad.
1126/// * (4): set if the block can fall through to its next.
1127/// The remaining bits are zero.
1128static unsigned getBBAddrMapMetadata(const MachineBasicBlock &MBB) {
1129 const TargetInstrInfo *TII = MBB.getParent()->getSubtarget().getInstrInfo();
1130 return ((unsigned)MBB.isReturnBlock()) |
1131 ((!MBB.empty() && TII->isTailCall(MBB.back())) << 1) |
1132 (MBB.isEHPad() << 2) |
1133 (const_cast<MachineBasicBlock &>(MBB).canFallThrough() << 3);
1134}
1135
1136void AsmPrinter::emitBBAddrMapSection(const MachineFunction &MF) {
1137 MCSection *BBAddrMapSection =
1138 getObjFileLowering().getBBAddrMapSection(*MF.getSection());
1139 assert(BBAddrMapSection && ".llvm_bb_addr_map section is not initialized.")(static_cast <bool> (BBAddrMapSection && ".llvm_bb_addr_map section is not initialized."
) ? void (0) : __assert_fail ("BBAddrMapSection && \".llvm_bb_addr_map section is not initialized.\""
, "/build/llvm-toolchain-snapshot-14~++20210926122410+d23fd8ae8906/llvm/lib/CodeGen/AsmPrinter/AsmPrinter.cpp"
, 1139, __extension__ __PRETTY_FUNCTION__))
;
1140
1141 const MCSymbol *FunctionSymbol = getFunctionBegin();
1142
1143 OutStreamer->PushSection();
1144 OutStreamer->SwitchSection(BBAddrMapSection);
1145 OutStreamer->emitSymbolValue(FunctionSymbol, getPointerSize());
1146 // Emit the total number of basic blocks in this function.
1147 OutStreamer->emitULEB128IntValue(MF.size());
1148 // Emit BB Information for each basic block in the funciton.
1149 for (const MachineBasicBlock &MBB : MF) {
1150 const MCSymbol *MBBSymbol =
1151 MBB.isEntryBlock() ? FunctionSymbol : MBB.getSymbol();
1152 // Emit the basic block offset.
1153 emitLabelDifferenceAsULEB128(MBBSymbol, FunctionSymbol);
1154 // Emit the basic block size. When BBs have alignments, their size cannot
1155 // always be computed from their offsets.
1156 emitLabelDifferenceAsULEB128(MBB.getEndSymbol(), MBBSymbol);
1157 OutStreamer->emitULEB128IntValue(getBBAddrMapMetadata(MBB));
1158 }
1159 OutStreamer->PopSection();
1160}
1161
1162void AsmPrinter::emitPseudoProbe(const MachineInstr &MI) {
1163 auto GUID = MI.getOperand(0).getImm();
1164 auto Index = MI.getOperand(1).getImm();
1165 auto Type = MI.getOperand(2).getImm();
1166 auto Attr = MI.getOperand(3).getImm();
1167 DILocation *DebugLoc = MI.getDebugLoc();
1168 PP->emitPseudoProbe(GUID, Index, Type, Attr, DebugLoc);
1169}
1170
1171void AsmPrinter::emitStackSizeSection(const MachineFunction &MF) {
1172 if (!MF.getTarget().Options.EmitStackSizeSection)
1173 return;
1174
1175 MCSection *StackSizeSection =
1176 getObjFileLowering().getStackSizesSection(*getCurrentSection());
1177 if (!StackSizeSection)
1178 return;
1179
1180 const MachineFrameInfo &FrameInfo = MF.getFrameInfo();
1181 // Don't emit functions with dynamic stack allocations.
1182 if (FrameInfo.hasVarSizedObjects())
1183 return;
1184
1185 OutStreamer->PushSection();
1186 OutStreamer->SwitchSection(StackSizeSection);
1187
1188 const MCSymbol *FunctionSymbol = getFunctionBegin();
1189 uint64_t StackSize = FrameInfo.getStackSize();
1190 OutStreamer->emitSymbolValue(FunctionSymbol, TM.getProgramPointerSize());
1191 OutStreamer->emitULEB128IntValue(StackSize);
1192
1193 OutStreamer->PopSection();
1194}
1195
1196void AsmPrinter::emitStackUsage(const MachineFunction &MF) {
1197 const std::string &OutputFilename = MF.getTarget().Options.StackUsageOutput;
1198
1199 // OutputFilename empty implies -fstack-usage is not passed.
1200 if (OutputFilename.empty())
1201 return;
1202
1203 const MachineFrameInfo &FrameInfo = MF.getFrameInfo();
1204 uint64_t StackSize = FrameInfo.getStackSize();
1205
1206 if (StackUsageStream == nullptr) {
1207 std::error_code EC;
1208 StackUsageStream =
1209 std::make_unique<raw_fd_ostream>(OutputFilename, EC, sys::fs::OF_Text);
1210 if (EC) {
1211 errs() << "Could not open file: " << EC.message();
1212 return;
1213 }
1214 }
1215
1216 *StackUsageStream << MF.getFunction().getParent()->getName();
1217 if (const DISubprogram *DSP = MF.getFunction().getSubprogram())
1218 *StackUsageStream << ':' << DSP->getLine();
1219
1220 *StackUsageStream << ':' << MF.getName() << '\t' << StackSize << '\t';
1221 if (FrameInfo.hasVarSizedObjects())
1222 *StackUsageStream << "dynamic\n";
1223 else
1224 *StackUsageStream << "static\n";
1225}
1226
1227static bool needFuncLabelsForEHOrDebugInfo(const MachineFunction &MF) {
1228 MachineModuleInfo &MMI = MF.getMMI();
1229 if (!MF.getLandingPads().empty() || MF.hasEHFunclets() || MMI.hasDebugInfo())
1230 return true;
1231
1232 // We might emit an EH table that uses function begin and end labels even if
1233 // we don't have any landingpads.
1234 if (!MF.getFunction().hasPersonalityFn())
1235 return false;
1236 return !isNoOpWithoutInvoke(
1237 classifyEHPersonality(MF.getFunction().getPersonalityFn()));
1238}
1239
1240/// EmitFunctionBody - This method emits the body and trailer for a
1241/// function.
1242void AsmPrinter::emitFunctionBody() {
1243 emitFunctionHeader();
1244
1245 // Emit target-specific gunk before the function body.
1246 emitFunctionBodyStart();
1247
1248 if (isVerbose()) {
1249 // Get MachineDominatorTree or compute it on the fly if it's unavailable
1250 MDT = getAnalysisIfAvailable<MachineDominatorTree>();
1251 if (!MDT) {
1252 OwnedMDT = std::make_unique<MachineDominatorTree>();
1253 OwnedMDT->getBase().recalculate(*MF);
1254 MDT = OwnedMDT.get();
1255 }
1256
1257 // Get MachineLoopInfo or compute it on the fly if it's unavailable
1258 MLI = getAnalysisIfAvailable<MachineLoopInfo>();
1259 if (!MLI) {
1260 OwnedMLI = std::make_unique<MachineLoopInfo>();
1261 OwnedMLI->getBase().analyze(MDT->getBase());
1262 MLI = OwnedMLI.get();
1263 }
1264 }
1265
1266 // Print out code for the function.
1267 bool HasAnyRealCode = false;
1268 int NumInstsInFunction = 0;
1269
1270 bool CanDoExtraAnalysis = ORE->allowExtraAnalysis(DEBUG_TYPE"asm-printer");
1271 for (auto &MBB : *MF) {
1272 // Print a label for the basic block.
1273 emitBasicBlockStart(MBB);
1274 DenseMap<StringRef, unsigned> MnemonicCounts;
1275 for (auto &MI : MBB) {
1276 // Print the assembly for the instruction.
1277 if (!MI.isPosition() && !MI.isImplicitDef() && !MI.isKill() &&
1278 !MI.isDebugInstr()) {
1279 HasAnyRealCode = true;
1280 ++NumInstsInFunction;
1281 }
1282
1283 // If there is a pre-instruction symbol, emit a label for it here.
1284 if (MCSymbol *S = MI.getPreInstrSymbol())
1285 OutStreamer->emitLabel(S);
1286
1287 for (const HandlerInfo &HI : Handlers) {
1288 NamedRegionTimer T(HI.TimerName, HI.TimerDescription, HI.TimerGroupName,
1289 HI.TimerGroupDescription, TimePassesIsEnabled);
1290 HI.Handler->beginInstruction(&MI);
1291 }
1292
1293 if (isVerbose())
1294 emitComments(MI, OutStreamer->GetCommentOS());
1295
1296 switch (MI.getOpcode()) {
1297 case TargetOpcode::CFI_INSTRUCTION:
1298 emitCFIInstruction(MI);
1299 break;
1300 case TargetOpcode::LOCAL_ESCAPE:
1301 emitFrameAlloc(MI);
1302 break;
1303 case TargetOpcode::ANNOTATION_LABEL:
1304 case TargetOpcode::EH_LABEL:
1305 case TargetOpcode::GC_LABEL:
1306 OutStreamer->emitLabel(MI.getOperand(0).getMCSymbol());
1307 break;
1308 case TargetOpcode::INLINEASM:
1309 case TargetOpcode::INLINEASM_BR:
1310 emitInlineAsm(&MI);
1311 break;
1312 case TargetOpcode::DBG_VALUE:
1313 case TargetOpcode::DBG_VALUE_LIST:
1314 if (isVerbose()) {
1315 if (!emitDebugValueComment(&MI, *this))
1316 emitInstruction(&MI);
1317 }
1318 break;
1319 case TargetOpcode::DBG_INSTR_REF:
1320 // This instruction reference will have been resolved to a machine
1321 // location, and a nearby DBG_VALUE created. We can safely ignore
1322 // the instruction reference.
1323 break;
1324 case TargetOpcode::DBG_PHI:
1325 // This instruction is only used to label a program point, it's purely
1326 // meta information.
1327 break;
1328 case TargetOpcode::DBG_LABEL:
1329 if (isVerbose()) {
1330 if (!emitDebugLabelComment(&MI, *this))
1331 emitInstruction(&MI);
1332 }
1333 break;
1334 case TargetOpcode::IMPLICIT_DEF:
1335 if (isVerbose()) emitImplicitDef(&MI);
1336 break;
1337 case TargetOpcode::KILL:
1338 if (isVerbose()) emitKill(&MI, *this);
1339 break;
1340 case TargetOpcode::PSEUDO_PROBE:
1341 emitPseudoProbe(MI);
1342 break;
1343 case TargetOpcode::ARITH_FENCE:
1344 if (isVerbose())
1345 OutStreamer->emitRawComment("ARITH_FENCE");
1346 break;
1347 default:
1348 emitInstruction(&MI);
1349 if (CanDoExtraAnalysis) {
1350 MCInst MCI;
1351 MCI.setOpcode(MI.getOpcode());
1352 auto Name = OutStreamer->getMnemonic(MCI);
1353 auto I = MnemonicCounts.insert({Name, 0u});
1354 I.first->second++;
1355 }
1356 break;
1357 }
1358
1359 // If there is a post-instruction symbol, emit a label for it here.
1360 if (MCSymbol *S = MI.getPostInstrSymbol())
1361 OutStreamer->emitLabel(S);
1362
1363 for (const HandlerInfo &HI : Handlers) {
1364 NamedRegionTimer T(HI.TimerName, HI.TimerDescription, HI.TimerGroupName,
1365 HI.TimerGroupDescription, TimePassesIsEnabled);
1366 HI.Handler->endInstruction();
1367 }
1368 }
1369
1370 // We must emit temporary symbol for the end of this basic block, if either
1371 // we have BBLabels enabled or if this basic blocks marks the end of a
1372 // section.
1373 if (MF->hasBBLabels() ||
1374 (MAI->hasDotTypeDotSizeDirective() && MBB.isEndSection()))
1375 OutStreamer->emitLabel(MBB.getEndSymbol());
1376
1377 if (MBB.isEndSection()) {
1378 // The size directive for the section containing the entry block is
1379 // handled separately by the function section.
1380 if (!MBB.sameSection(&MF->front())) {
1381 if (MAI->hasDotTypeDotSizeDirective()) {
1382 // Emit the size directive for the basic block section.
1383 const MCExpr *SizeExp = MCBinaryExpr::createSub(
1384 MCSymbolRefExpr::create(MBB.getEndSymbol(), OutContext),
1385 MCSymbolRefExpr::create(CurrentSectionBeginSym, OutContext),
1386 OutContext);
1387 OutStreamer->emitELFSize(CurrentSectionBeginSym, SizeExp);
1388 }
1389 MBBSectionRanges[MBB.getSectionIDNum()] =
1390 MBBSectionRange{CurrentSectionBeginSym, MBB.getEndSymbol()};
1391 }
1392 }
1393 emitBasicBlockEnd(MBB);
1394
1395 if (CanDoExtraAnalysis) {
1396 // Skip empty blocks.
1397 if (MBB.empty())
1398 continue;
1399
1400 MachineOptimizationRemarkAnalysis R(DEBUG_TYPE"asm-printer", "InstructionMix",
1401 MBB.begin()->getDebugLoc(), &MBB);
1402
1403 // Generate instruction mix remark. First, sort counts in descending order
1404 // by count and name.
1405 SmallVector<std::pair<StringRef, unsigned>, 128> MnemonicVec;
1406 for (auto &KV : MnemonicCounts)
1407 MnemonicVec.emplace_back(KV.first, KV.second);
1408
1409 sort(MnemonicVec, [](const std::pair<StringRef, unsigned> &A,
1410 const std::pair<StringRef, unsigned> &B) {
1411 if (A.second > B.second)
1412 return true;
1413 if (A.second == B.second)
1414 return StringRef(A.first) < StringRef(B.first);
1415 return false;
1416 });
1417 R << "BasicBlock: " << ore::NV("BasicBlock", MBB.getName()) << "\n";
1418 for (auto &KV : MnemonicVec) {
1419 auto Name = (Twine("INST_") + KV.first.trim()).str();
1420 R << KV.first << ": " << ore::NV(Name, KV.second) << "\n";
1421 }
1422 ORE->emit(R);
1423 }
1424 }
1425
1426 EmittedInsts += NumInstsInFunction;
1427 MachineOptimizationRemarkAnalysis R(DEBUG_TYPE"asm-printer", "InstructionCount",
1428 MF->getFunction().getSubprogram(),
1429 &MF->front());
1430 R << ore::NV("NumInstructions", NumInstsInFunction)
1431 << " instructions in function";
1432 ORE->emit(R);
1433
1434 // If the function is empty and the object file uses .subsections_via_symbols,
1435 // then we need to emit *something* to the function body to prevent the
1436 // labels from collapsing together. Just emit a noop.
1437 // Similarly, don't emit empty functions on Windows either. It can lead to
1438 // duplicate entries (two functions with the same RVA) in the Guard CF Table
1439 // after linking, causing the kernel not to load the binary:
1440 // https://developercommunity.visualstudio.com/content/problem/45366/vc-linker-creates-invalid-dll-with-clang-cl.html
1441 // FIXME: Hide this behind some API in e.g. MCAsmInfo or MCTargetStreamer.
1442 const Triple &TT = TM.getTargetTriple();
1443 if (!HasAnyRealCode && (MAI->hasSubsectionsViaSymbols() ||
1444 (TT.isOSWindows() && TT.isOSBinFormatCOFF()))) {
1445 MCInst Noop = MF->getSubtarget().getInstrInfo()->getNop();
1446
1447 // Targets can opt-out of emitting the noop here by leaving the opcode
1448 // unspecified.
1449 if (Noop.getOpcode()) {
1450 OutStreamer->AddComment("avoids zero-length function");
1451 emitNops(1);
1452 }
1453 }
1454
1455 // Switch to the original section in case basic block sections was used.
1456 OutStreamer->SwitchSection(MF->getSection());
1457
1458 const Function &F = MF->getFunction();
1459 for (const auto &BB : F) {
1460 if (!BB.hasAddressTaken())
1461 continue;
1462 MCSymbol *Sym = GetBlockAddressSymbol(&BB);
1463 if (Sym->isDefined())
1464 continue;
1465 OutStreamer->AddComment("Address of block that was removed by CodeGen");
1466 OutStreamer->emitLabel(Sym);
1467 }
1468
1469 // Emit target-specific gunk after the function body.
1470 emitFunctionBodyEnd();
1471
1472 if (needFuncLabelsForEHOrDebugInfo(*MF) ||
1473 MAI->hasDotTypeDotSizeDirective()) {
1474 // Create a symbol for the end of function.
1475 CurrentFnEnd = createTempSymbol("func_end");
1476 OutStreamer->emitLabel(CurrentFnEnd);
1477 }
1478
1479 // If the target wants a .size directive for the size of the function, emit
1480 // it.
1481 if (MAI->hasDotTypeDotSizeDirective()) {
1482 // We can get the size as difference between the function label and the
1483 // temp label.
1484 const MCExpr *SizeExp = MCBinaryExpr::createSub(
1485 MCSymbolRefExpr::create(CurrentFnEnd, OutContext),
1486 MCSymbolRefExpr::create(CurrentFnSymForSize, OutContext), OutContext);
1487 OutStreamer->emitELFSize(CurrentFnSym, SizeExp);
1488 }
1489
1490 for (const HandlerInfo &HI : Handlers) {
1491 NamedRegionTimer T(HI.TimerName, HI.TimerDescription, HI.TimerGroupName,
1492 HI.TimerGroupDescription, TimePassesIsEnabled);
1493 HI.Handler->markFunctionEnd();
1494 }
1495
1496 MBBSectionRanges[MF->front().getSectionIDNum()] =
1497 MBBSectionRange{CurrentFnBegin, CurrentFnEnd};
1498
1499 // Print out jump tables referenced by the function.
1500 emitJumpTableInfo();
1501
1502 // Emit post-function debug and/or EH information.
1503 for (const HandlerInfo &HI : Handlers) {
1504 NamedRegionTimer T(HI.TimerName, HI.TimerDescription, HI.TimerGroupName,
1505 HI.TimerGroupDescription, TimePassesIsEnabled);
1506 HI.Handler->endFunction(MF);
1507 }
1508
1509 // Emit section containing BB address offsets and their metadata, when
1510 // BB labels are requested for this function. Skip empty functions.
1511 if (MF->hasBBLabels() && HasAnyRealCode)
1512 emitBBAddrMapSection(*MF);
1513
1514 // Emit section containing stack size metadata.
1515 emitStackSizeSection(*MF);
1516
1517 // Emit .su file containing function stack size information.
1518 emitStackUsage(*MF);
1519
1520 emitPatchableFunctionEntries();
1521
1522 if (isVerbose())
1523 OutStreamer->GetCommentOS() << "-- End function\n";
1524
1525 OutStreamer->AddBlankLine();
1526}
1527
1528/// Compute the number of Global Variables that uses a Constant.
1529static unsigned getNumGlobalVariableUses(const Constant *C) {
1530 if (!C)
1531 return 0;
1532
1533 if (isa<GlobalVariable>(C))
1534 return 1;
1535
1536 unsigned NumUses = 0;
1537 for (auto *CU : C->users())
1538 NumUses += getNumGlobalVariableUses(dyn_cast<Constant>(CU));
1539
1540 return NumUses;
1541}
1542
1543/// Only consider global GOT equivalents if at least one user is a
1544/// cstexpr inside an initializer of another global variables. Also, don't
1545/// handle cstexpr inside instructions. During global variable emission,
1546/// candidates are skipped and are emitted later in case at least one cstexpr
1547/// isn't replaced by a PC relative GOT entry access.
1548static bool isGOTEquivalentCandidate(const GlobalVariable *GV,
1549 unsigned &NumGOTEquivUsers) {
1550 // Global GOT equivalents are unnamed private globals with a constant
1551 // pointer initializer to another global symbol. They must point to a
1552 // GlobalVariable or Function, i.e., as GlobalValue.
1553 if (!GV->hasGlobalUnnamedAddr() || !GV->hasInitializer() ||
1554 !GV->isConstant() || !GV->isDiscardableIfUnused() ||
1555 !isa<GlobalValue>(GV->getOperand(0)))
1556 return false;
1557
1558 // To be a got equivalent, at least one of its users need to be a constant
1559 // expression used by another global variable.
1560 for (auto *U : GV->users())
1561 NumGOTEquivUsers += getNumGlobalVariableUses(dyn_cast<Constant>(U));
1562
1563 return NumGOTEquivUsers > 0;
1564}
1565
1566/// Unnamed constant global variables solely contaning a pointer to
1567/// another globals variable is equivalent to a GOT table entry; it contains the
1568/// the address of another symbol. Optimize it and replace accesses to these
1569/// "GOT equivalents" by using the GOT entry for the final global instead.
1570/// Compute GOT equivalent candidates among all global variables to avoid
1571/// emitting them if possible later on, after it use is replaced by a GOT entry
1572/// access.
1573void AsmPrinter::computeGlobalGOTEquivs(Module &M) {
1574 if (!getObjFileLowering().supportIndirectSymViaGOTPCRel())
1575 return;
1576
1577 for (const auto &G : M.globals()) {
1578 unsigned NumGOTEquivUsers = 0;
1579 if (!isGOTEquivalentCandidate(&G, NumGOTEquivUsers))
1580 continue;
1581
1582 const MCSymbol *GOTEquivSym = getSymbol(&G);
1583 GlobalGOTEquivs[GOTEquivSym] = std::make_pair(&G, NumGOTEquivUsers);
1584 }
1585}
1586
1587/// Constant expressions using GOT equivalent globals may not be eligible
1588/// for PC relative GOT entry conversion, in such cases we need to emit such
1589/// globals we previously omitted in EmitGlobalVariable.
1590void AsmPrinter::emitGlobalGOTEquivs() {
1591 if (!getObjFileLowering().supportIndirectSymViaGOTPCRel())
1592 return;
1593
1594 SmallVector<const GlobalVariable *, 8> FailedCandidates;
1595 for (auto &I : GlobalGOTEquivs) {
1596 const GlobalVariable *GV = I.second.first;
1597 unsigned Cnt = I.second.second;
1598 if (Cnt)
1599 FailedCandidates.push_back(GV);
1600 }
1601 GlobalGOTEquivs.clear();
1602
1603 for (auto *GV : FailedCandidates)
1604 emitGlobalVariable(GV);
1605}
1606
1607void AsmPrinter::emitGlobalIndirectSymbol(Module &M,
1608 const GlobalIndirectSymbol& GIS) {
1609 MCSymbol *Name = getSymbol(&GIS);
1610 bool IsFunction = GIS.getValueType()->isFunctionTy();
1611 // Treat bitcasts of functions as functions also. This is important at least
1612 // on WebAssembly where object and function addresses can't alias each other.
1613 if (!IsFunction)
1614 if (auto *CE = dyn_cast<ConstantExpr>(GIS.getIndirectSymbol()))
1615 if (CE->getOpcode() == Instruction::BitCast)
1616 IsFunction =
1617 CE->getOperand(0)->getType()->getPointerElementType()->isFunctionTy();
1618
1619 // AIX's assembly directive `.set` is not usable for aliasing purpose,
1620 // so AIX has to use the extra-label-at-definition strategy. At this
1621 // point, all the extra label is emitted, we just have to emit linkage for
1622 // those labels.
1623 if (TM.getTargetTriple().isOSBinFormatXCOFF()) {
1624 assert(!isa<GlobalIFunc>(GIS) && "IFunc is not supported on AIX.")(static_cast <bool> (!isa<GlobalIFunc>(GIS) &&
"IFunc is not supported on AIX.") ? void (0) : __assert_fail
("!isa<GlobalIFunc>(GIS) && \"IFunc is not supported on AIX.\""
, "/build/llvm-toolchain-snapshot-14~++20210926122410+d23fd8ae8906/llvm/lib/CodeGen/AsmPrinter/AsmPrinter.cpp"
, 1624, __extension__ __PRETTY_FUNCTION__))
;
1625 assert(MAI->hasVisibilityOnlyWithLinkage() &&(static_cast <bool> (MAI->hasVisibilityOnlyWithLinkage
() && "Visibility should be handled with emitLinkage() on AIX."
) ? void (0) : __assert_fail ("MAI->hasVisibilityOnlyWithLinkage() && \"Visibility should be handled with emitLinkage() on AIX.\""
, "/build/llvm-toolchain-snapshot-14~++20210926122410+d23fd8ae8906/llvm/lib/CodeGen/AsmPrinter/AsmPrinter.cpp"
, 1626, __extension__ __PRETTY_FUNCTION__))
1626 "Visibility should be handled with emitLinkage() on AIX.")(static_cast <bool> (MAI->hasVisibilityOnlyWithLinkage
() && "Visibility should be handled with emitLinkage() on AIX."
) ? void (0) : __assert_fail ("MAI->hasVisibilityOnlyWithLinkage() && \"Visibility should be handled with emitLinkage() on AIX.\""
, "/build/llvm-toolchain-snapshot-14~++20210926122410+d23fd8ae8906/llvm/lib/CodeGen/AsmPrinter/AsmPrinter.cpp"
, 1626, __extension__ __PRETTY_FUNCTION__))
;
1627 emitLinkage(&GIS, Name);
1628 // If it's a function, also emit linkage for aliases of function entry
1629 // point.
1630 if (IsFunction)
1631 emitLinkage(&GIS,
1632 getObjFileLowering().getFunctionEntryPointSymbol(&GIS, TM));
1633 return;
1634 }
1635
1636 if (GIS.hasExternalLinkage() || !MAI->getWeakRefDirective())
1637 OutStreamer->emitSymbolAttribute(Name, MCSA_Global);
1638 else if (GIS.hasWeakLinkage() || GIS.hasLinkOnceLinkage())
1639 OutStreamer->emitSymbolAttribute(Name, MCSA_WeakReference);
1640 else
1641 assert(GIS.hasLocalLinkage() && "Invalid alias or ifunc linkage")(static_cast <bool> (GIS.hasLocalLinkage() && "Invalid alias or ifunc linkage"
) ? void (0) : __assert_fail ("GIS.hasLocalLinkage() && \"Invalid alias or ifunc linkage\""
, "/build/llvm-toolchain-snapshot-14~++20210926122410+d23fd8ae8906/llvm/lib/CodeGen/AsmPrinter/AsmPrinter.cpp"
, 1641, __extension__ __PRETTY_FUNCTION__))
;
1642
1643 // Set the symbol type to function if the alias has a function type.
1644 // This affects codegen when the aliasee is not a function.
1645 if (IsFunction)
1646 OutStreamer->emitSymbolAttribute(Name, isa<GlobalIFunc>(GIS)
1647 ? MCSA_ELF_TypeIndFunction
1648 : MCSA_ELF_TypeFunction);
1649
1650 emitVisibility(Name, GIS.getVisibility());
1651
1652 const MCExpr *Expr = lowerConstant(GIS.getIndirectSymbol());
1653
1654 if (isa<GlobalAlias>(&GIS) && MAI->hasAltEntry() && isa<MCBinaryExpr>(Expr))
1655 OutStreamer->emitSymbolAttribute(Name, MCSA_AltEntry);
1656
1657 // Emit the directives as assignments aka .set:
1658 OutStreamer->emitAssignment(Name, Expr);
1659 MCSymbol *LocalAlias = getSymbolPreferLocal(GIS);
1660 if (LocalAlias != Name)
1661 OutStreamer->emitAssignment(LocalAlias, Expr);
1662
1663 if (auto *GA = dyn_cast<GlobalAlias>(&GIS)) {
1664 // If the aliasee does not correspond to a symbol in the output, i.e. the
1665 // alias is not of an object or the aliased object is private, then set the
1666 // size of the alias symbol from the type of the alias. We don't do this in
1667 // other situations as the alias and aliasee having differing types but same
1668 // size may be intentional.
1669 const GlobalObject *BaseObject = GA->getBaseObject();
1670 if (MAI->hasDotTypeDotSizeDirective() && GA->getValueType()->isSized() &&
1671 (!BaseObject || BaseObject->hasPrivateLinkage())) {
1672 const DataLayout &DL = M.getDataLayout();
1673 uint64_t Size = DL.getTypeAllocSize(GA->getValueType());
1674 OutStreamer->emitELFSize(Name, MCConstantExpr::create(Size, OutContext));
1675 }
1676 }
1677}
1678
1679void AsmPrinter::emitRemarksSection(remarks::RemarkStreamer &RS) {
1680 if (!RS.needsSection())
1681 return;
1682
1683 remarks::RemarkSerializer &RemarkSerializer = RS.getSerializer();
1684
1685 Optional<SmallString<128>> Filename;
1686 if (Optional<StringRef> FilenameRef = RS.getFilename()) {
1687 Filename = *FilenameRef;
1688 sys::fs::make_absolute(*Filename);
1689 assert(!Filename->empty() && "The filename can't be empty.")(static_cast <bool> (!Filename->empty() && "The filename can't be empty."
) ? void (0) : __assert_fail ("!Filename->empty() && \"The filename can't be empty.\""
, "/build/llvm-toolchain-snapshot-14~++20210926122410+d23fd8ae8906/llvm/lib/CodeGen/AsmPrinter/AsmPrinter.cpp"
, 1689, __extension__ __PRETTY_FUNCTION__))
;
1690 }
1691
1692 std::string Buf;
1693 raw_string_ostream OS(Buf);
1694 std::unique_ptr<remarks::MetaSerializer> MetaSerializer =
1695 Filename ? RemarkSerializer.metaSerializer(OS, Filename->str())
1696 : RemarkSerializer.metaSerializer(OS);
1697 MetaSerializer->emit();
1698
1699 // Switch to the remarks section.
1700 MCSection *RemarksSection =
1701 OutContext.getObjectFileInfo()->getRemarksSection();
1702 OutStreamer->SwitchSection(RemarksSection);
1703
1704 OutStreamer->emitBinaryData(OS.str());
1705}
1706
1707bool AsmPrinter::doFinalization(Module &M) {
1708 // Set the MachineFunction to nullptr so that we can catch attempted
1709 // accesses to MF specific features at the module level and so that
1710 // we can conditionalize accesses based on whether or not it is nullptr.
1711 MF = nullptr;
1712
1713 // Gather all GOT equivalent globals in the module. We really need two
1714 // passes over the globals: one to compute and another to avoid its emission
1715 // in EmitGlobalVariable, otherwise we would not be able to handle cases
1716 // where the got equivalent shows up before its use.
1717 computeGlobalGOTEquivs(M);
1718
1719 // Emit global variables.
1720 for (const auto &G : M.globals())
1721 emitGlobalVariable(&G);
1722
1723 // Emit remaining GOT equivalent globals.
1724 emitGlobalGOTEquivs();
1725
1726 const TargetLoweringObjectFile &TLOF = getObjFileLowering();
1727
1728 // Emit linkage(XCOFF) and visibility info for declarations
1729 for (const Function &F : M) {
1730 if (!F.isDeclarationForLinker())
1731 continue;
1732
1733 MCSymbol *Name = getSymbol(&F);
1734 // Function getSymbol gives us the function descriptor symbol for XCOFF.
1735
1736 if (!TM.getTargetTriple().isOSBinFormatXCOFF()) {
1737 GlobalValue::VisibilityTypes V = F.getVisibility();
1738 if (V == GlobalValue::DefaultVisibility)
1739 continue;
1740
1741 emitVisibility(Name, V, false);
1742 continue;
1743 }
1744
1745 if (F.isIntrinsic())
1746 continue;
1747
1748 // Handle the XCOFF case.
1749 // Variable `Name` is the function descriptor symbol (see above). Get the
1750 // function entry point symbol.
1751 MCSymbol *FnEntryPointSym = TLOF.getFunctionEntryPointSymbol(&F, TM);
1752 // Emit linkage for the function entry point.
1753 emitLinkage(&F, FnEntryPointSym);
1754
1755 // Emit linkage for the function descriptor.
1756 emitLinkage(&F, Name);
1757 }
1758
1759 // Emit the remarks section contents.
1760 // FIXME: Figure out when is the safest time to emit this section. It should
1761 // not come after debug info.
1762 if (remarks::RemarkStreamer *RS = M.getContext().getMainRemarkStreamer())
1763 emitRemarksSection(*RS);
1764
1765 TLOF.emitModuleMetadata(*OutStreamer, M);
1766
1767 if (TM.getTargetTriple().isOSBinFormatELF()) {
1768 MachineModuleInfoELF &MMIELF = MMI->getObjFileInfo<MachineModuleInfoELF>();
1769
1770 // Output stubs for external and common global variables.
1771 MachineModuleInfoELF::SymbolListTy Stubs = MMIELF.GetGVStubList();
1772 if (!Stubs.empty()) {
1773 OutStreamer->SwitchSection(TLOF.getDataSection());
1774 const DataLayout &DL = M.getDataLayout();
1775
1776 emitAlignment(Align(DL.getPointerSize()));
1777 for (const auto &Stub : Stubs) {
1778 OutStreamer->emitLabel(Stub.first);
1779 OutStreamer->emitSymbolValue(Stub.second.getPointer(),
1780 DL.getPointerSize());
1781 }
1782 }
1783 }
1784
1785 if (TM.getTargetTriple().isOSBinFormatCOFF()) {
1786 MachineModuleInfoCOFF &MMICOFF =
1787 MMI->getObjFileInfo<MachineModuleInfoCOFF>();
1788
1789 // Output stubs for external and common global variables.
1790 MachineModuleInfoCOFF::SymbolListTy Stubs = MMICOFF.GetGVStubList();
1791 if (!Stubs.empty()) {
1792 const DataLayout &DL = M.getDataLayout();
1793
1794 for (const auto &Stub : Stubs) {
1795 SmallString<256> SectionName = StringRef(".rdata$");
1796 SectionName += Stub.first->getName();
1797 OutStreamer->SwitchSection(OutContext.getCOFFSection(
1798 SectionName,
1799 COFF::IMAGE_SCN_CNT_INITIALIZED_DATA | COFF::IMAGE_SCN_MEM_READ |
1800 COFF::IMAGE_SCN_LNK_COMDAT,
1801 SectionKind::getReadOnly(), Stub.first->getName(),
1802 COFF::IMAGE_COMDAT_SELECT_ANY));
1803 emitAlignment(Align(DL.getPointerSize()));
1804 OutStreamer->emitSymbolAttribute(Stub.first, MCSA_Global);
1805 OutStreamer->emitLabel(Stub.first);
1806 OutStreamer->emitSymbolValue(Stub.second.getPointer(),
1807 DL.getPointerSize());
1808 }
1809 }
1810 }
1811
1812 // This needs to happen before emitting debug information since that can end
1813 // arbitrary sections.
1814 if (auto *TS = OutStreamer->getTargetStreamer())
1815 TS->emitConstantPools();
1816
1817 // Finalize debug and EH information.
1818 for (const HandlerInfo &HI : Handlers) {
1819 NamedRegionTimer T(HI.TimerName, HI.TimerDescription, HI.TimerGroupName,
1820 HI.TimerGroupDescription, TimePassesIsEnabled);
1821 HI.Handler->endModule();
1822 }
1823
1824 // This deletes all the ephemeral handlers that AsmPrinter added, while
1825 // keeping all the user-added handlers alive until the AsmPrinter is
1826 // destroyed.
1827 Handlers.erase(Handlers.begin() + NumUserHandlers, Handlers.end());
1828 DD = nullptr;
1829
1830 // If the target wants to know about weak references, print them all.
1831 if (MAI->getWeakRefDirective()) {
1832 // FIXME: This is not lazy, it would be nice to only print weak references
1833 // to stuff that is actually used. Note that doing so would require targets
1834 // to notice uses in operands (due to constant exprs etc). This should
1835 // happen with the MC stuff eventually.
1836
1837 // Print out module-level global objects here.
1838 for (const auto &GO : M.global_objects()) {
1839 if (!GO.hasExternalWeakLinkage())
1840 continue;
1841 OutStreamer->emitSymbolAttribute(getSymbol(&GO), MCSA_WeakReference);
1842 }
1843 }
1844
1845 // Print aliases in topological order, that is, for each alias a = b,
1846 // b must be printed before a.
1847 // This is because on some targets (e.g. PowerPC) linker expects aliases in
1848 // such an order to generate correct TOC information.
1849 SmallVector<const GlobalAlias *, 16> AliasStack;
1850 SmallPtrSet<const GlobalAlias *, 16> AliasVisited;
1851 for (const auto &Alias : M.aliases()) {
1852 for (const GlobalAlias *Cur = &Alias; Cur;
1853 Cur = dyn_cast<GlobalAlias>(Cur->getAliasee())) {
1854 if (!AliasVisited.insert(Cur).second)
1855 break;
1856 AliasStack.push_back(Cur);
1857 }
1858 for (const GlobalAlias *AncestorAlias : llvm::reverse(AliasStack))
1859 emitGlobalIndirectSymbol(M, *AncestorAlias);
1860 AliasStack.clear();
1861 }
1862 for (const auto &IFunc : M.ifuncs())
1863 emitGlobalIndirectSymbol(M, IFunc);
1864
1865 GCModuleInfo *MI = getAnalysisIfAvailable<GCModuleInfo>();
1866 assert(MI && "AsmPrinter didn't require GCModuleInfo?")(static_cast <bool> (MI && "AsmPrinter didn't require GCModuleInfo?"
) ? void (0) : __assert_fail ("MI && \"AsmPrinter didn't require GCModuleInfo?\""
, "/build/llvm-toolchain-snapshot-14~++20210926122410+d23fd8ae8906/llvm/lib/CodeGen/AsmPrinter/AsmPrinter.cpp"
, 1866, __extension__ __PRETTY_FUNCTION__))
;
1867 for (GCModuleInfo::iterator I = MI->end(), E = MI->begin(); I != E; )
1868 if (GCMetadataPrinter *MP = GetOrCreateGCPrinter(**--I))
1869 MP->finishAssembly(M, *MI, *this);
1870
1871 // Emit llvm.ident metadata in an '.ident' directive.
1872 emitModuleIdents(M);
1873
1874 // Emit bytes for llvm.commandline metadata.
1875 emitModuleCommandLines(M);
1876
1877 // Emit __morestack address if needed for indirect calls.
1878 if (MMI->usesMorestackAddr()) {
1879 Align Alignment(1);
1880 MCSection *ReadOnlySection = getObjFileLowering().getSectionForConstant(
1881 getDataLayout(), SectionKind::getReadOnly(),
1882 /*C=*/nullptr, Alignment);
1883 OutStreamer->SwitchSection(ReadOnlySection);
1884
1885 MCSymbol *AddrSymbol =
1886 OutContext.getOrCreateSymbol(StringRef("__morestack_addr"));
1887 OutStreamer->emitLabel(AddrSymbol);
1888
1889 unsigned PtrSize = MAI->getCodePointerSize();
1890 OutStreamer->emitSymbolValue(GetExternalSymbolSymbol("__morestack"),
1891 PtrSize);
1892 }
1893
1894 // Emit .note.GNU-split-stack and .note.GNU-no-split-stack sections if
1895 // split-stack is used.
1896 if (TM.getTargetTriple().isOSBinFormatELF() && MMI->hasSplitStack()) {
1897 OutStreamer->SwitchSection(
1898 OutContext.getELFSection(".note.GNU-split-stack", ELF::SHT_PROGBITS, 0));
1899 if (MMI->hasNosplitStack())
1900 OutStreamer->SwitchSection(
1901 OutContext.getELFSection(".note.GNU-no-split-stack", ELF::SHT_PROGBITS, 0));
1902 }
1903
1904 // If we don't have any trampolines, then we don't require stack memory
1905 // to be executable. Some targets have a directive to declare this.
1906 Function *InitTrampolineIntrinsic = M.getFunction("llvm.init.trampoline");
1907 if (!InitTrampolineIntrinsic || InitTrampolineIntrinsic->use_empty())
1908 if (MCSection *S = MAI->getNonexecutableStackSection(OutContext))
1909 OutStreamer->SwitchSection(S);
1910
1911 if (TM.Options.EmitAddrsig) {
1912 // Emit address-significance attributes for all globals.
1913 OutStreamer->emitAddrsig();
1914 for (const GlobalValue &GV : M.global_values()) {
1915 if (!GV.use_empty() && !GV.isTransitiveUsedByMetadataOnly() &&
1916 !GV.isThreadLocal() && !GV.hasDLLImportStorageClass() &&
1917 !GV.getName().startswith("llvm.") && !GV.hasAtLeastLocalUnnamedAddr())
1918 OutStreamer->emitAddrsigSym(getSymbol(&GV));
1919 }
1920 }
1921
1922 // Emit symbol partition specifications (ELF only).
1923 if (TM.getTargetTriple().isOSBinFormatELF()) {
1924 unsigned UniqueID = 0;
1925 for (const GlobalValue &GV : M.global_values()) {
1926 if (!GV.hasPartition() || GV.isDeclarationForLinker() ||
1927 GV.getVisibility() != GlobalValue::DefaultVisibility)
1928 continue;
1929
1930 OutStreamer->SwitchSection(
1931 OutContext.getELFSection(".llvm_sympart", ELF::SHT_LLVM_SYMPART, 0, 0,
1932 "", false, ++UniqueID, nullptr));
1933 OutStreamer->emitBytes(GV.getPartition());
1934 OutStreamer->emitZeros(1);
1935 OutStreamer->emitValue(
1936 MCSymbolRefExpr::create(getSymbol(&GV), OutContext),
1937 MAI->getCodePointerSize());
1938 }
1939 }
1940
1941 // Allow the target to emit any magic that it wants at the end of the file,
1942 // after everything else has gone out.
1943 emitEndOfAsmFile(M);
1944
1945 MMI = nullptr;
1946
1947 OutStreamer->Finish();
1948 OutStreamer->reset();
1949 OwnedMLI.reset();
1950 OwnedMDT.reset();
1951
1952 return false;
1953}
1954
1955MCSymbol *AsmPrinter::getMBBExceptionSym(const MachineBasicBlock &MBB) {
1956 auto Res = MBBSectionExceptionSyms.try_emplace(MBB.getSectionIDNum());
1957 if (Res.second)
1958 Res.first->second = createTempSymbol("exception");
1959 return Res.first->second;
1960}
1961
1962void AsmPrinter::SetupMachineFunction(MachineFunction &MF) {
1963 this->MF = &MF;
1964 const Function &F = MF.getFunction();
1965
1966 // Get the function symbol.
1967 if (!MAI->needsFunctionDescriptors()) {
1968 CurrentFnSym = getSymbol(&MF.getFunction());
1969 } else {
1970 assert(TM.getTargetTriple().isOSAIX() &&(static_cast <bool> (TM.getTargetTriple().isOSAIX() &&
"Only AIX uses the function descriptor hooks.") ? void (0) :
__assert_fail ("TM.getTargetTriple().isOSAIX() && \"Only AIX uses the function descriptor hooks.\""
, "/build/llvm-toolchain-snapshot-14~++20210926122410+d23fd8ae8906/llvm/lib/CodeGen/AsmPrinter/AsmPrinter.cpp"
, 1971, __extension__ __PRETTY_FUNCTION__))
1971 "Only AIX uses the function descriptor hooks.")(static_cast <bool> (TM.getTargetTriple().isOSAIX() &&
"Only AIX uses the function descriptor hooks.") ? void (0) :
__assert_fail ("TM.getTargetTriple().isOSAIX() && \"Only AIX uses the function descriptor hooks.\""
, "/build/llvm-toolchain-snapshot-14~++20210926122410+d23fd8ae8906/llvm/lib/CodeGen/AsmPrinter/AsmPrinter.cpp"
, 1971, __extension__ __PRETTY_FUNCTION__))
;
1972 // AIX is unique here in that the name of the symbol emitted for the
1973 // function body does not have the same name as the source function's
1974 // C-linkage name.
1975 assert(CurrentFnDescSym && "The function descriptor symbol needs to be"(static_cast <bool> (CurrentFnDescSym && "The function descriptor symbol needs to be"
" initalized first.") ? void (0) : __assert_fail ("CurrentFnDescSym && \"The function descriptor symbol needs to be\" \" initalized first.\""
, "/build/llvm-toolchain-snapshot-14~++20210926122410+d23fd8ae8906/llvm/lib/CodeGen/AsmPrinter/AsmPrinter.cpp"
, 1976, __extension__ __PRETTY_FUNCTION__))
1976 " initalized first.")(static_cast <bool> (CurrentFnDescSym && "The function descriptor symbol needs to be"
" initalized first.") ? void (0) : __assert_fail ("CurrentFnDescSym && \"The function descriptor symbol needs to be\" \" initalized first.\""
, "/build/llvm-toolchain-snapshot-14~++20210926122410+d23fd8ae8906/llvm/lib/CodeGen/AsmPrinter/AsmPrinter.cpp"
, 1976, __extension__ __PRETTY_FUNCTION__))
;
1977
1978 // Get the function entry point symbol.
1979 CurrentFnSym = getObjFileLowering().getFunctionEntryPointSymbol(&F, TM);
1980 }
1981
1982 CurrentFnSymForSize = CurrentFnSym;
1983 CurrentFnBegin = nullptr;
1984 CurrentSectionBeginSym = nullptr;
1985 MBBSectionRanges.clear();
1986 MBBSectionExceptionSyms.clear();
1987 bool NeedsLocalForSize = MAI->needsLocalForSize();
1988 if (F.hasFnAttribute("patchable-function-entry") ||
1989 F.hasFnAttribute("function-instrument") ||
1990 F.hasFnAttribute("xray-instruction-threshold") ||
1991 needFuncLabelsForEHOrDebugInfo(MF) || NeedsLocalForSize ||
1992 MF.getTarget().Options.EmitStackSizeSection || MF.hasBBLabels()) {
1993 CurrentFnBegin = createTempSymbol("func_begin");
1994 if (NeedsLocalForSize)
1995 CurrentFnSymForSize = CurrentFnBegin;
1996 }
1997
1998 ORE = &getAnalysis<MachineOptimizationRemarkEmitterPass>().getORE();
1999}
2000
2001namespace {
2002
2003// Keep track the alignment, constpool entries per Section.
2004 struct SectionCPs {
2005 MCSection *S;
2006 Align Alignment;
2007 SmallVector<unsigned, 4> CPEs;
2008
2009 SectionCPs(MCSection *s, Align a) : S(s), Alignment(a) {}
2010 };
2011
2012} // end anonymous namespace
2013
2014/// EmitConstantPool - Print to the current output stream assembly
2015/// representations of the constants in the constant pool MCP. This is
2016/// used to print out constants which have been "spilled to memory" by
2017/// the code generator.
2018void AsmPrinter::emitConstantPool() {
2019 const MachineConstantPool *MCP = MF->getConstantPool();
2020 const std::vector<MachineConstantPoolEntry> &CP = MCP->getConstants();
2021 if (CP.empty()) return;
2022
2023 // Calculate sections for constant pool entries. We collect entries to go into
2024 // the same section together to reduce amount of section switch statements.
2025 SmallVector<SectionCPs, 4> CPSections;
2026 for (unsigned i = 0, e = CP.size(); i != e; ++i) {
2027 const MachineConstantPoolEntry &CPE = CP[i];
2028 Align Alignment = CPE.getAlign();
2029
2030 SectionKind Kind = CPE.getSectionKind(&getDataLayout());
2031
2032 const Constant *C = nullptr;
2033 if (!CPE.isMachineConstantPoolEntry())
2034 C = CPE.Val.ConstVal;
2035
2036 MCSection *S = getObjFileLowering().getSectionForConstant(
2037 getDataLayout(), Kind, C, Alignment);
2038
2039 // The number of sections are small, just do a linear search from the
2040 // last section to the first.
2041 bool Found = false;
2042 unsigned SecIdx = CPSections.size();
2043 while (SecIdx != 0) {
2044 if (CPSections[--SecIdx].S == S) {
2045 Found = true;
2046 break;
2047 }
2048 }
2049 if (!Found) {
2050 SecIdx = CPSections.size();
2051 CPSections.push_back(SectionCPs(S, Alignment));
2052 }
2053
2054 if (Alignment > CPSections[SecIdx].Alignment)
2055 CPSections[SecIdx].Alignment = Alignment;
2056 CPSections[SecIdx].CPEs.push_back(i);
2057 }
2058
2059 // Now print stuff into the calculated sections.
2060 const MCSection *CurSection = nullptr;
2061 unsigned Offset = 0;
2062 for (unsigned i = 0, e = CPSections.size(); i != e; ++i) {
2063 for (unsigned j = 0, ee = CPSections[i].CPEs.size(); j != ee; ++j) {
2064 unsigned CPI = CPSections[i].CPEs[j];
2065 MCSymbol *Sym = GetCPISymbol(CPI);
2066 if (!Sym->isUndefined())
2067 continue;
2068
2069 if (CurSection != CPSections[i].S) {
2070 OutStreamer->SwitchSection(CPSections[i].S);
2071 emitAlignment(Align(CPSections[i].Alignment));
2072 CurSection = CPSections[i].S;
2073 Offset = 0;
2074 }
2075
2076 MachineConstantPoolEntry CPE = CP[CPI];
2077
2078 // Emit inter-object padding for alignment.
2079 unsigned NewOffset = alignTo(Offset, CPE.getAlign());
2080 OutStreamer->emitZeros(NewOffset - Offset);
2081
2082 Offset = NewOffset + CPE.getSizeInBytes(getDataLayout());
2083
2084 OutStreamer->emitLabel(Sym);
2085 if (CPE.isMachineConstantPoolEntry())
2086 emitMachineConstantPoolValue(CPE.Val.MachineCPVal);
2087 else
2088 emitGlobalConstant(getDataLayout(), CPE.Val.ConstVal);
2089 }
2090 }
2091}
2092
2093// Print assembly representations of the jump tables used by the current
2094// function.
2095void AsmPrinter::emitJumpTableInfo() {
2096 const DataLayout &DL = MF->getDataLayout();
2097 const MachineJumpTableInfo *MJTI = MF->getJumpTableInfo();
2098 if (!MJTI) return;
2099 if (MJTI->getEntryKind() == MachineJumpTableInfo::EK_Inline) return;
2100 const std::vector<MachineJumpTableEntry> &JT = MJTI->getJumpTables();
2101 if (JT.empty()) return;
2102
2103 // Pick the directive to use to print the jump table entries, and switch to
2104 // the appropriate section.
2105 const Function &F = MF->getFunction();
2106 const TargetLoweringObjectFile &TLOF = getObjFileLowering();
2107 bool JTInDiffSection = !TLOF.shouldPutJumpTableInFunctionSection(
2108 MJTI->getEntryKind() == MachineJumpTableInfo::EK_LabelDifference32,
2109 F);
2110 if (JTInDiffSection) {
2111 // Drop it in the readonly section.
2112 MCSection *ReadOnlySection = TLOF.getSectionForJumpTable(F, TM);
2113 OutStreamer->SwitchSection(ReadOnlySection);
2114 }
2115
2116 emitAlignment(Align(MJTI->getEntryAlignment(DL)));
2117
2118 // Jump tables in code sections are marked with a data_region directive
2119 // where that's supported.
2120 if (!JTInDiffSection)
2121 OutStreamer->emitDataRegion(MCDR_DataRegionJT32);
2122
2123 for (unsigned JTI = 0, e = JT.size(); JTI != e; ++JTI) {
2124 const std::vector<MachineBasicBlock*> &JTBBs = JT[JTI].MBBs;
2125
2126 // If this jump table was deleted, ignore it.
2127 if (JTBBs.empty()) continue;
2128
2129 // For the EK_LabelDifference32 entry, if using .set avoids a relocation,
2130 /// emit a .set directive for each unique entry.
2131 if (MJTI->getEntryKind() == MachineJumpTableInfo::EK_LabelDifference32 &&
2132 MAI->doesSetDirectiveSuppressReloc()) {
2133 SmallPtrSet<const MachineBasicBlock*, 16> EmittedSets;
2134 const TargetLowering *TLI = MF->getSubtarget().getTargetLowering();
2135 const MCExpr *Base = TLI->getPICJumpTableRelocBaseExpr(MF,JTI,OutContext);
2136 for (unsigned ii = 0, ee = JTBBs.size(); ii != ee; ++ii) {
2137 const MachineBasicBlock *MBB = JTBBs[ii];
2138 if (!EmittedSets.insert(MBB).second)
2139 continue;
2140
2141 // .set LJTSet, LBB32-base
2142 const MCExpr *LHS =
2143 MCSymbolRefExpr::create(MBB->getSymbol(), OutContext);
2144 OutStreamer->emitAssignment(GetJTSetSymbol(JTI, MBB->getNumber()),
2145 MCBinaryExpr::createSub(LHS, Base,
2146 OutContext));
2147 }
2148 }
2149
2150 // On some targets (e.g. Darwin) we want to emit two consecutive labels
2151 // before each jump table. The first label is never referenced, but tells
2152 // the assembler and linker the extents of the jump table object. The
2153 // second label is actually referenced by the code.
2154 if (JTInDiffSection && DL.hasLinkerPrivateGlobalPrefix())
2155 // FIXME: This doesn't have to have any specific name, just any randomly
2156 // named and numbered local label started with 'l' would work. Simplify
2157 // GetJTISymbol.
2158 OutStreamer->emitLabel(GetJTISymbol(JTI, true));
2159
2160 MCSymbol* JTISymbol = GetJTISymbol(JTI);
2161 OutStreamer->emitLabel(JTISymbol);
2162
2163 for (unsigned ii = 0, ee = JTBBs.size(); ii != ee; ++ii)
2164 emitJumpTableEntry(MJTI, JTBBs[ii], JTI);
2165 }
2166 if (!JTInDiffSection)
2167 OutStreamer->emitDataRegion(MCDR_DataRegionEnd);
2168}
2169
2170/// EmitJumpTableEntry - Emit a jump table entry for the specified MBB to the
2171/// current stream.
2172void AsmPrinter::emitJumpTableEntry(const MachineJumpTableInfo *MJTI,
2173 const MachineBasicBlock *MBB,
2174 unsigned UID) const {
2175 assert(MBB && MBB->getNumber() >= 0 && "Invalid basic block")(static_cast <bool> (MBB && MBB->getNumber()
>= 0 && "Invalid basic block") ? void (0) : __assert_fail
("MBB && MBB->getNumber() >= 0 && \"Invalid basic block\""
, "/build/llvm-toolchain-snapshot-14~++20210926122410+d23fd8ae8906/llvm/lib/CodeGen/AsmPrinter/AsmPrinter.cpp"
, 2175, __extension__ __PRETTY_FUNCTION__))
;
2176 const MCExpr *Value = nullptr;
2177 switch (MJTI->getEntryKind()) {
2178 case MachineJumpTableInfo::EK_Inline:
2179 llvm_unreachable("Cannot emit EK_Inline jump table entry")::llvm::llvm_unreachable_internal("Cannot emit EK_Inline jump table entry"
, "/build/llvm-toolchain-snapshot-14~++20210926122410+d23fd8ae8906/llvm/lib/CodeGen/AsmPrinter/AsmPrinter.cpp"
, 2179)
;
2180 case MachineJumpTableInfo::EK_Custom32:
2181 Value = MF->getSubtarget().getTargetLowering()->LowerCustomJumpTableEntry(
2182 MJTI, MBB, UID, OutContext);
2183 break;
2184 case MachineJumpTableInfo::EK_BlockAddress:
2185 // EK_BlockAddress - Each entry is a plain address of block, e.g.:
2186 // .word LBB123
2187 Value = MCSymbolRefExpr::create(MBB->getSymbol(), OutContext);
2188 break;
2189 case MachineJumpTableInfo::EK_GPRel32BlockAddress: {
2190 // EK_GPRel32BlockAddress - Each entry is an address of block, encoded
2191 // with a relocation as gp-relative, e.g.:
2192 // .gprel32 LBB123
2193 MCSymbol *MBBSym = MBB->getSymbol();
2194 OutStreamer->emitGPRel32Value(MCSymbolRefExpr::create(MBBSym, OutContext));
2195 return;
2196 }
2197
2198 case MachineJumpTableInfo::EK_GPRel64BlockAddress: {
2199 // EK_GPRel64BlockAddress - Each entry is an address of block, encoded
2200 // with a relocation as gp-relative, e.g.:
2201 // .gpdword LBB123
2202 MCSymbol *MBBSym = MBB->getSymbol();
2203 OutStreamer->emitGPRel64Value(MCSymbolRefExpr::create(MBBSym, OutContext));
2204 return;
2205 }
2206
2207 case MachineJumpTableInfo::EK_LabelDifference32: {
2208 // Each entry is the address of the block minus the address of the jump
2209 // table. This is used for PIC jump tables where gprel32 is not supported.
2210 // e.g.:
2211 // .word LBB123 - LJTI1_2
2212 // If the .set directive avoids relocations, this is emitted as:
2213 // .set L4_5_set_123, LBB123 - LJTI1_2
2214 // .word L4_5_set_123
2215 if (MAI->doesSetDirectiveSuppressReloc()) {
2216 Value = MCSymbolRefExpr::create(GetJTSetSymbol(UID, MBB->getNumber()),
2217 OutContext);
2218 break;
2219 }
2220 Value = MCSymbolRefExpr::create(MBB->getSymbol(), OutContext);
2221 const TargetLowering *TLI = MF->getSubtarget().getTargetLowering();
2222 const MCExpr *Base = TLI->getPICJumpTableRelocBaseExpr(MF, UID, OutContext);
2223 Value = MCBinaryExpr::createSub(Value, Base, OutContext);
2224 break;
2225 }
2226 }
2227
2228 assert(Value && "Unknown entry kind!")(static_cast <bool> (Value && "Unknown entry kind!"
) ? void (0) : __assert_fail ("Value && \"Unknown entry kind!\""
, "/build/llvm-toolchain-snapshot-14~++20210926122410+d23fd8ae8906/llvm/lib/CodeGen/AsmPrinter/AsmPrinter.cpp"
, 2228, __extension__ __PRETTY_FUNCTION__))
;
2229
2230 unsigned EntrySize = MJTI->getEntrySize(getDataLayout());
2231 OutStreamer->emitValue(Value, EntrySize);
2232}
2233
2234/// EmitSpecialLLVMGlobal - Check to see if the specified global is a
2235/// special global used by LLVM. If so, emit it and return true, otherwise
2236/// do nothing and return false.
2237bool AsmPrinter::emitSpecialLLVMGlobal(const GlobalVariable *GV) {
2238 if (GV->getName() == "llvm.used") {
2239 if (MAI->hasNoDeadStrip()) // No need to emit this at all.
2240 emitLLVMUsedList(cast<ConstantArray>(GV->getInitializer()));
2241 return true;
2242 }
2243
2244 // Ignore debug and non-emitted data. This handles llvm.compiler.used.
2245 if (GV->getSection() == "llvm.metadata" ||
2246 GV->hasAvailableExternallyLinkage())
2247 return true;
2248
2249 if (!GV->hasAppendingLinkage()) return false;
2250
2251 assert(GV->hasInitializer() && "Not a special LLVM global!")(static_cast <bool> (GV->hasInitializer() &&
"Not a special LLVM global!") ? void (0) : __assert_fail ("GV->hasInitializer() && \"Not a special LLVM global!\""
, "/build/llvm-toolchain-snapshot-14~++20210926122410+d23fd8ae8906/llvm/lib/CodeGen/AsmPrinter/AsmPrinter.cpp"
, 2251, __extension__ __PRETTY_FUNCTION__))
;
2252
2253 if (GV->getName() == "llvm.global_ctors") {
2254 emitXXStructorList(GV->getParent()->getDataLayout(), GV->getInitializer(),
2255 /* isCtor */ true);
2256
2257 return true;
2258 }
2259
2260 if (GV->getName() == "llvm.global_dtors") {
2261 emitXXStructorList(GV->getParent()->getDataLayout(), GV->getInitializer(),
2262 /* isCtor */ false);
2263
2264 return true;
2265 }
2266
2267 report_fatal_error("unknown special variable");
2268}
2269
2270/// EmitLLVMUsedList - For targets that define a MAI::UsedDirective, mark each
2271/// global in the specified llvm.used list.
2272void AsmPrinter::emitLLVMUsedList(const ConstantArray *InitList) {
2273 // Should be an array of 'i8*'.
2274 for (unsigned i = 0, e = InitList->getNumOperands(); i != e; ++i) {
2275 const GlobalValue *GV =
2276 dyn_cast<GlobalValue>(InitList->getOperand(i)->stripPointerCasts());
2277 if (GV)
2278 OutStreamer->emitSymbolAttribute(getSymbol(GV), MCSA_NoDeadStrip);
2279 }
2280}
2281
2282void AsmPrinter::preprocessXXStructorList(const DataLayout &DL,
2283 const Constant *List,
2284 SmallVector<Structor, 8> &Structors) {
2285 // Should be an array of '{ i32, void ()*, i8* }' structs. The first value is
2286 // the init priority.
2287 if (!isa<ConstantArray>(List))
2288 return;
2289
2290 // Gather the structors in a form that's convenient for sorting by priority.
2291 for (Value *O : cast<ConstantArray>(List)->operands()) {
2292 auto *CS = cast<ConstantStruct>(O);
2293 if (CS->getOperand(1)->isNullValue())
2294 break; // Found a null terminator, skip the rest.
2295 ConstantInt *Priority = dyn_cast<ConstantInt>(CS->getOperand(0));
2296 if (!Priority)
2297 continue; // Malformed.
2298 Structors.push_back(Structor());
2299 Structor &S = Structors.back();
2300 S.Priority = Priority->getLimitedValue(65535);
2301 S.Func = CS->getOperand(1);
2302 if (!CS->getOperand(2)->isNullValue()) {
2303 if (TM.getTargetTriple().isOSAIX())
2304 llvm::report_fatal_error(
2305 "associated data of XXStructor list is not yet supported on AIX");
2306 S.ComdatKey =
2307 dyn_cast<GlobalValue>(CS->getOperand(2)->stripPointerCasts());
2308 }
2309 }
2310
2311 // Emit the function pointers in the target-specific order
2312 llvm::stable_sort(Structors, [](const Structor &L, const Structor &R) {
2313 return L.Priority < R.Priority;
2314 });
2315}
2316
2317/// EmitXXStructorList - Emit the ctor or dtor list taking into account the init
2318/// priority.
2319void AsmPrinter::emitXXStructorList(const DataLayout &DL, const Constant *List,
2320 bool IsCtor) {
2321 SmallVector<Structor, 8> Structors;
2322 preprocessXXStructorList(DL, List, Structors);
2323 if (Structors.empty())
2324 return;
2325
2326 // Emit the structors in reverse order if we are using the .ctor/.dtor
2327 // initialization scheme.
2328 if (!TM.Options.UseInitArray)
2329 std::reverse(Structors.begin(), Structors.end());
2330
2331 const Align Align = DL.getPointerPrefAlignment();
2332 for (Structor &S : Structors) {
2333 const TargetLoweringObjectFile &Obj = getObjFileLowering();
2334 const MCSymbol *KeySym = nullptr;
2335 if (GlobalValue *GV = S.ComdatKey) {
2336 if (GV->isDeclarationForLinker())
2337 // If the associated variable is not defined in this module
2338 // (it might be available_externally, or have been an
2339 // available_externally definition that was dropped by the
2340 // EliminateAvailableExternally pass), some other TU
2341 // will provide its dynamic initializer.
2342 continue;
2343
2344 KeySym = getSymbol(GV);
2345 }
2346
2347 MCSection *OutputSection =
2348 (IsCtor ? Obj.getStaticCtorSection(S.Priority, KeySym)
2349 : Obj.getStaticDtorSection(S.Priority, KeySym));
2350 OutStreamer->SwitchSection(OutputSection);
2351 if (OutStreamer->getCurrentSection() != OutStreamer->getPreviousSection())
2352 emitAlignment(Align);
2353 emitXXStructor(DL, S.Func);
2354 }
2355}
2356
2357void AsmPrinter::emitModuleIdents(Module &M) {
2358 if (!MAI->hasIdentDirective())
2359 return;
2360
2361 if (const NamedMDNode *NMD = M.getNamedMetadata("llvm.ident")) {
2362 for (unsigned i = 0, e = NMD->getNumOperands(); i != e; ++i) {
2363 const MDNode *N = NMD->getOperand(i);
2364 assert(N->getNumOperands() == 1 &&(static_cast <bool> (N->getNumOperands() == 1 &&
"llvm.ident metadata entry can have only one operand") ? void
(0) : __assert_fail ("N->getNumOperands() == 1 && \"llvm.ident metadata entry can have only one operand\""
, "/build/llvm-toolchain-snapshot-14~++20210926122410+d23fd8ae8906/llvm/lib/CodeGen/AsmPrinter/AsmPrinter.cpp"
, 2365, __extension__ __PRETTY_FUNCTION__))
2365 "llvm.ident metadata entry can have only one operand")(static_cast <bool> (N->getNumOperands() == 1 &&
"llvm.ident metadata entry can have only one operand") ? void
(0) : __assert_fail ("N->getNumOperands() == 1 && \"llvm.ident metadata entry can have only one operand\""
, "/build/llvm-toolchain-snapshot-14~++20210926122410+d23fd8ae8906/llvm/lib/CodeGen/AsmPrinter/AsmPrinter.cpp"
, 2365, __extension__ __PRETTY_FUNCTION__))
;
2366 const MDString *S = cast<MDString>(N->getOperand(0));
2367 OutStreamer->emitIdent(S->getString());
2368 }
2369 }
2370}
2371
2372void AsmPrinter::emitModuleCommandLines(Module &M) {
2373 MCSection *CommandLine = getObjFileLowering().getSectionForCommandLines();
2374 if (!CommandLine)
2375 return;
2376
2377 const NamedMDNode *NMD = M.getNamedMetadata("llvm.commandline");
2378 if (!NMD || !NMD->getNumOperands())
2379 return;
2380
2381 OutStreamer->PushSection();
2382 OutStreamer->SwitchSection(CommandLine);
2383 OutStreamer->emitZeros(1);
2384 for (unsigned i = 0, e = NMD->getNumOperands(); i != e; ++i) {
2385 const MDNode *N = NMD->getOperand(i);
2386 assert(N->getNumOperands() == 1 &&(static_cast <bool> (N->getNumOperands() == 1 &&
"llvm.commandline metadata entry can have only one operand")
? void (0) : __assert_fail ("N->getNumOperands() == 1 && \"llvm.commandline metadata entry can have only one operand\""
, "/build/llvm-toolchain-snapshot-14~++20210926122410+d23fd8ae8906/llvm/lib/CodeGen/AsmPrinter/AsmPrinter.cpp"
, 2387, __extension__ __PRETTY_FUNCTION__))
2387 "llvm.commandline metadata entry can have only one operand")(static_cast <bool> (N->getNumOperands() == 1 &&
"llvm.commandline metadata entry can have only one operand")
? void (0) : __assert_fail ("N->getNumOperands() == 1 && \"llvm.commandline metadata entry can have only one operand\""
, "/build/llvm-toolchain-snapshot-14~++20210926122410+d23fd8ae8906/llvm/lib/CodeGen/AsmPrinter/AsmPrinter.cpp"
, 2387, __extension__ __PRETTY_FUNCTION__))
;
2388 const MDString *S = cast<MDString>(N->getOperand(0));
2389 OutStreamer->emitBytes(S->getString());
2390 OutStreamer->emitZeros(1);
2391 }
2392 OutStreamer->PopSection();
2393}
2394
2395//===--------------------------------------------------------------------===//
2396// Emission and print routines
2397//
2398
2399/// Emit a byte directive and value.
2400///
2401void AsmPrinter::emitInt8(int Value) const { OutStreamer->emitInt8(Value); }
2402
2403/// Emit a short directive and value.
2404void AsmPrinter::emitInt16(int Value) const { OutStreamer->emitInt16(Value); }
2405
2406/// Emit a long directive and value.
2407void AsmPrinter::emitInt32(int Value) const { OutStreamer->emitInt32(Value); }
2408
2409/// Emit a long long directive and value.
2410void AsmPrinter::emitInt64(uint64_t Value) const {
2411 OutStreamer->emitInt64(Value);
2412}
2413
2414/// Emit something like ".long Hi-Lo" where the size in bytes of the directive
2415/// is specified by Size and Hi/Lo specify the labels. This implicitly uses
2416/// .set if it avoids relocations.
2417void AsmPrinter::emitLabelDifference(const MCSymbol *Hi, const MCSymbol *Lo,
2418 unsigned Size) const {
2419 OutStreamer->emitAbsoluteSymbolDiff(Hi, Lo, Size);
2420}
2421
2422/// EmitLabelPlusOffset - Emit something like ".long Label+Offset"
2423/// where the size in bytes of the directive is specified by Size and Label
2424/// specifies the label. This implicitly uses .set if it is available.
2425void AsmPrinter::emitLabelPlusOffset(const MCSymbol *Label, uint64_t Offset,
2426 unsigned Size,
2427 bool IsSectionRelative) const {
2428 if (MAI->needsDwarfSectionOffsetDirective() && IsSectionRelative) {
2429 OutStreamer->EmitCOFFSecRel32(Label, Offset);
2430 if (Size > 4)
2431 OutStreamer->emitZeros(Size - 4);
2432 return;
2433 }
2434
2435 // Emit Label+Offset (or just Label if Offset is zero)
2436 const MCExpr *Expr = MCSymbolRefExpr::create(Label, OutContext);
2437 if (Offset)
2438 Expr = MCBinaryExpr::createAdd(
2439 Expr, MCConstantExpr::create(Offset, OutContext), OutContext);
2440
2441 OutStreamer->emitValue(Expr, Size);
2442}
2443
2444//===----------------------------------------------------------------------===//
2445
2446// EmitAlignment - Emit an alignment directive to the specified power of
2447// two boundary. If a global value is specified, and if that global has
2448// an explicit alignment requested, it will override the alignment request
2449// if required for correctness.
2450void AsmPrinter::emitAlignment(Align Alignment, const GlobalObject *GV) const {
2451 if (GV)
2452 Alignment = getGVAlignment(GV, GV->getParent()->getDataLayout(), Alignment);
2453
2454 if (Alignment == Align(1))
2455 return; // 1-byte aligned: no need to emit alignment.
2456
2457 if (getCurrentSection()->getKind().isText()) {
2458 const MCSubtargetInfo *STI = nullptr;
2459 if (this->MF)
2460 STI = &getSubtargetInfo();
2461 else
2462 STI = TM.getMCSubtargetInfo();
2463 OutStreamer->emitCodeAlignment(Alignment.value(), STI);
2464 } else
2465 OutStreamer->emitValueToAlignment(Alignment.value());
2466}
2467
2468//===----------------------------------------------------------------------===//
2469// Constant emission.
2470//===----------------------------------------------------------------------===//
2471
2472const MCExpr *AsmPrinter::lowerConstant(const Constant *CV) {
2473 MCContext &Ctx = OutContext;
2474
2475 if (CV->isNullValue() || isa<UndefValue>(CV))
2476 return MCConstantExpr::create(0, Ctx);
2477
2478 if (const ConstantInt *CI = dyn_cast<ConstantInt>(CV))
2479 return MCConstantExpr::create(CI->getZExtValue(), Ctx);
2480
2481 if (const GlobalValue *GV = dyn_cast<GlobalValue>(CV))
2482 return MCSymbolRefExpr::create(getSymbol(GV), Ctx);
2483
2484 if (const BlockAddress *BA = dyn_cast<BlockAddress>(CV))
2485 return MCSymbolRefExpr::create(GetBlockAddressSymbol(BA), Ctx);
2486
2487 if (const auto *Equiv = dyn_cast<DSOLocalEquivalent>(CV))
2488 return getObjFileLowering().lowerDSOLocalEquivalent(Equiv, TM);
2489
2490 const ConstantExpr *CE = dyn_cast<ConstantExpr>(CV);
2491 if (!CE) {
2492 llvm_unreachable("Unknown constant value to lower!")::llvm::llvm_unreachable_internal("Unknown constant value to lower!"
, "/build/llvm-toolchain-snapshot-14~++20210926122410+d23fd8ae8906/llvm/lib/CodeGen/AsmPrinter/AsmPrinter.cpp"
, 2492)
;
2493 }
2494
2495 switch (CE->getOpcode()) {
2496 case Instruction::AddrSpaceCast: {
2497 const Constant *Op = CE->getOperand(0);
2498 unsigned DstAS = CE->getType()->getPointerAddressSpace();
2499 unsigned SrcAS = Op->getType()->getPointerAddressSpace();
2500 if (TM.isNoopAddrSpaceCast(SrcAS, DstAS))
2501 return lowerConstant(Op);
2502
2503 // Fallthrough to error.
2504 LLVM_FALLTHROUGH[[gnu::fallthrough]];
2505 }
2506 default: {
2507 // If the code isn't optimized, there may be outstanding folding
2508 // opportunities. Attempt to fold the expression using DataLayout as a
2509 // last resort before giving up.
2510 Constant *C = ConstantFoldConstant(CE, getDataLayout());
2511 if (C != CE)
2512 return lowerConstant(C);
2513
2514 // Otherwise report the problem to the user.
2515 std::string S;
2516 raw_string_ostream OS(S);
2517 OS << "Unsupported expression in static initializer: ";
2518 CE->printAsOperand(OS, /*PrintType=*/false,
2519 !MF ? nullptr : MF->getFunction().getParent());
2520 report_fatal_error(OS.str());
2521 }
2522 case Instruction::GetElementPtr: {
2523 // Generate a symbolic expression for the byte address
2524 APInt OffsetAI(getDataLayout().getPointerTypeSizeInBits(CE->getType()), 0);
2525 cast<GEPOperator>(CE)->accumulateConstantOffset(getDataLayout(), OffsetAI);
2526
2527 const MCExpr *Base = lowerConstant(CE->getOperand(0));
2528 if (!OffsetAI)
2529 return Base;
2530
2531 int64_t Offset = OffsetAI.getSExtValue();
2532 return MCBinaryExpr::createAdd(Base, MCConstantExpr::create(Offset, Ctx),
2533 Ctx);
2534 }
2535
2536 case Instruction::Trunc:
2537 // We emit the value and depend on the assembler to truncate the generated
2538 // expression properly. This is important for differences between
2539 // blockaddress labels. Since the two labels are in the same function, it
2540 // is reasonable to treat their delta as a 32-bit value.
2541 LLVM_FALLTHROUGH[[gnu::fallthrough]];
2542 case Instruction::BitCast:
2543 return lowerConstant(CE->getOperand(0));
2544
2545 case Instruction::IntToPtr: {
2546 const DataLayout &DL = getDataLayout();
2547
2548 // Handle casts to pointers by changing them into casts to the appropriate
2549 // integer type. This promotes constant folding and simplifies this code.
2550 Constant *Op = CE->getOperand(0);
2551 Op = ConstantExpr::getIntegerCast(Op, DL.getIntPtrType(CV->getType()),
2552 false/*ZExt*/);
2553 return lowerConstant(Op);
2554 }
2555
2556 case Instruction::PtrToInt: {
2557 const DataLayout &DL = getDataLayout();
2558
2559 // Support only foldable casts to/from pointers that can be eliminated by
2560 // changing the pointer to the appropriately sized integer type.
2561 Constant *Op = CE->getOperand(0);
2562 Type *Ty = CE->getType();
2563
2564 const MCExpr *OpExpr = lowerConstant(Op);
2565
2566 // We can emit the pointer value into this slot if the slot is an
2567 // integer slot equal to the size of the pointer.
2568 //
2569 // If the pointer is larger than the resultant integer, then
2570 // as with Trunc just depend on the assembler to truncate it.
2571 if (DL.getTypeAllocSize(Ty).getFixedSize() <=
2572 DL.getTypeAllocSize(Op->getType()).getFixedSize())
2573 return OpExpr;
2574
2575 // Otherwise the pointer is smaller than the resultant integer, mask off
2576 // the high bits so we are sure to get a proper truncation if the input is
2577 // a constant expr.
2578 unsigned InBits = DL.getTypeAllocSizeInBits(Op->getType());
2579 const MCExpr *MaskExpr = MCConstantExpr::create(~0ULL >> (64-InBits), Ctx);
2580 return MCBinaryExpr::createAnd(OpExpr, MaskExpr, Ctx);
2581 }
2582
2583 case Instruction::Sub: {
2584 GlobalValue *LHSGV;
2585 APInt LHSOffset;
2586 DSOLocalEquivalent *DSOEquiv;
2587 if (IsConstantOffsetFromGlobal(CE->getOperand(0), LHSGV, LHSOffset,
2588 getDataLayout(), &DSOEquiv)) {
2589 GlobalValue *RHSGV;
2590 APInt RHSOffset;
2591 if (IsConstantOffsetFromGlobal(CE->getOperand(1), RHSGV, RHSOffset,
2592 getDataLayout())) {
2593 const MCExpr *RelocExpr =
2594 getObjFileLowering().lowerRelativeReference(LHSGV, RHSGV, TM);
2595 if (!RelocExpr) {
2596 const MCExpr *LHSExpr =
2597 MCSymbolRefExpr::create(getSymbol(LHSGV), Ctx);
2598 if (DSOEquiv &&
2599 getObjFileLowering().supportDSOLocalEquivalentLowering())
2600 LHSExpr =
2601 getObjFileLowering().lowerDSOLocalEquivalent(DSOEquiv, TM);
2602 RelocExpr = MCBinaryExpr::createSub(
2603 LHSExpr, MCSymbolRefExpr::create(getSymbol(RHSGV), Ctx), Ctx);
2604 }
2605 int64_t Addend = (LHSOffset - RHSOffset).getSExtValue();
2606 if (Addend != 0)
2607 RelocExpr = MCBinaryExpr::createAdd(
2608 RelocExpr, MCConstantExpr::create(Addend, Ctx), Ctx);
2609 return RelocExpr;
2610 }
2611 }
2612 }
2613 // else fallthrough
2614 LLVM_FALLTHROUGH[[gnu::fallthrough]];
2615
2616 // The MC library also has a right-shift operator, but it isn't consistently
2617 // signed or unsigned between different targets.
2618 case Instruction::Add:
2619 case Instruction::Mul:
2620 case Instruction::SDiv:
2621 case Instruction::SRem:
2622 case Instruction::Shl:
2623 case Instruction::And:
2624 case Instruction::Or:
2625 case Instruction::Xor: {
2626 const MCExpr *LHS = lowerConstant(CE->getOperand(0));
2627 const MCExpr *RHS = lowerConstant(CE->getOperand(1));
2628 switch (CE->getOpcode()) {
2629 default: llvm_unreachable("Unknown binary operator constant cast expr")::llvm::llvm_unreachable_internal("Unknown binary operator constant cast expr"
, "/build/llvm-toolchain-snapshot-14~++20210926122410+d23fd8ae8906/llvm/lib/CodeGen/AsmPrinter/AsmPrinter.cpp"
, 2629)
;
2630 case Instruction::Add: return MCBinaryExpr::createAdd(LHS, RHS, Ctx);
2631 case Instruction::Sub: return MCBinaryExpr::createSub(LHS, RHS, Ctx);
2632 case Instruction::Mul: return MCBinaryExpr::createMul(LHS, RHS, Ctx);
2633 case Instruction::SDiv: return MCBinaryExpr::createDiv(LHS, RHS, Ctx);
2634 case Instruction::SRem: return MCBinaryExpr::createMod(LHS, RHS, Ctx);
2635 case Instruction::Shl: return MCBinaryExpr::createShl(LHS, RHS, Ctx);
2636 case Instruction::And: return MCBinaryExpr::createAnd(LHS, RHS, Ctx);
2637 case Instruction::Or: return MCBinaryExpr::createOr (LHS, RHS, Ctx);
2638 case Instruction::Xor: return MCBinaryExpr::createXor(LHS, RHS, Ctx);
2639 }
2640 }
2641 }
2642}
2643
2644static void emitGlobalConstantImpl(const DataLayout &DL, const Constant *C,
2645 AsmPrinter &AP,
2646 const Constant *BaseCV = nullptr,
2647 uint64_t Offset = 0);
2648
2649static void emitGlobalConstantFP(const ConstantFP *CFP, AsmPrinter &AP);
2650static void emitGlobalConstantFP(APFloat APF, Type *ET, AsmPrinter &AP);
2651
2652/// isRepeatedByteSequence - Determine whether the given value is
2653/// composed of a repeated sequence of identical bytes and return the
2654/// byte value. If it is not a repeated sequence, return -1.
2655static int isRepeatedByteSequence(const ConstantDataSequential *V) {
2656 StringRef Data = V->getRawDataValues();
2657 assert(!Data.empty() && "Empty aggregates should be CAZ node")(static_cast <bool> (!Data.empty() && "Empty aggregates should be CAZ node"
) ? void (0) : __assert_fail ("!Data.empty() && \"Empty aggregates should be CAZ node\""
, "/build/llvm-toolchain-snapshot-14~++20210926122410+d23fd8ae8906/llvm/lib/CodeGen/AsmPrinter/AsmPrinter.cpp"
, 2657, __extension__ __PRETTY_FUNCTION__))
;
2658 char C = Data[0];
2659 for (unsigned i = 1, e = Data.size(); i != e; ++i)
2660 if (Data[i] != C) return -1;
2661 return static_cast<uint8_t>(C); // Ensure 255 is not returned as -1.
2662}
2663
2664/// isRepeatedByteSequence - Determine whether the given value is
2665/// composed of a repeated sequence of identical bytes and return the
2666/// byte value. If it is not a repeated sequence, return -1.
2667static int isRepeatedByteSequence(const Value *V, const DataLayout &DL) {
2668 if (const ConstantInt *CI = dyn_cast<ConstantInt>(V)) {
2669 uint64_t Size = DL.getTypeAllocSizeInBits(V->getType());
2670 assert(Size % 8 == 0)(static_cast <bool> (Size % 8 == 0) ? void (0) : __assert_fail
("Size % 8 == 0", "/build/llvm-toolchain-snapshot-14~++20210926122410+d23fd8ae8906/llvm/lib/CodeGen/AsmPrinter/AsmPrinter.cpp"
, 2670, __extension__ __PRETTY_FUNCTION__))
;
2671
2672 // Extend the element to take zero padding into account.
2673 APInt Value = CI->getValue().zextOrSelf(Size);
2674 if (!Value.isSplat(8))
2675 return -1;
2676
2677 return Value.zextOrTrunc(8).getZExtValue();
2678 }
2679 if (const ConstantArray *CA = dyn_cast<ConstantArray>(V)) {
2680 // Make sure all array elements are sequences of the same repeated
2681 // byte.
2682 assert(CA->getNumOperands() != 0 && "Should be a CAZ")(static_cast <bool> (CA->getNumOperands() != 0 &&
"Should be a CAZ") ? void (0) : __assert_fail ("CA->getNumOperands() != 0 && \"Should be a CAZ\""
, "/build/llvm-toolchain-snapshot-14~++20210926122410+d23fd8ae8906/llvm/lib/CodeGen/AsmPrinter/AsmPrinter.cpp"
, 2682, __extension__ __PRETTY_FUNCTION__))
;
2683 Constant *Op0 = CA->getOperand(0);
2684 int Byte = isRepeatedByteSequence(Op0, DL);
2685 if (Byte == -1)
2686 return -1;
2687
2688 // All array elements must be equal.
2689 for (unsigned i = 1, e = CA->getNumOperands(); i != e; ++i)
2690 if (CA->getOperand(i) != Op0)
2691 return -1;
2692 return Byte;
2693 }
2694
2695 if (const ConstantDataSequential *CDS = dyn_cast<ConstantDataSequential>(V))
2696 return isRepeatedByteSequence(CDS);
2697
2698 return -1;
2699}
2700
2701static void emitGlobalConstantDataSequential(const DataLayout &DL,
2702 const ConstantDataSequential *CDS,
2703 AsmPrinter &AP) {
2704 // See if we can aggregate this into a .fill, if so, emit it as such.
2705 int Value = isRepeatedByteSequence(CDS, DL);
2706 if (Value != -1) {
2707 uint64_t Bytes = DL.getTypeAllocSize(CDS->getType());
2708 // Don't emit a 1-byte object as a .fill.
2709 if (Bytes > 1)
2710 return AP.OutStreamer->emitFill(Bytes, Value);
2711 }
2712
2713 // If this can be emitted with .ascii/.asciz, emit it as such.
2714 if (CDS->isString())
2715 return AP.OutStreamer->emitBytes(CDS->getAsString());
2716
2717 // Otherwise, emit the values in successive locations.
2718 unsigned ElementByteSize = CDS->getElementByteSize();
2719 if (isa<IntegerType>(CDS->getElementType())) {
2720 for (unsigned i = 0, e = CDS->getNumElements(); i != e; ++i) {
2721 if (AP.isVerbose())
2722 AP.OutStreamer->GetCommentOS() << format("0x%" PRIx64"l" "x" "\n",
2723 CDS->getElementAsInteger(i));
2724 AP.OutStreamer->emitIntValue(CDS->getElementAsInteger(i),
2725 ElementByteSize);
2726 }
2727 } else {
2728 Type *ET = CDS->getElementType();
2729 for (unsigned I = 0, E = CDS->getNumElements(); I != E; ++I)
2730 emitGlobalConstantFP(CDS->getElementAsAPFloat(I), ET, AP);
2731 }
2732
2733 unsigned Size = DL.getTypeAllocSize(CDS->getType());
2734 unsigned EmittedSize =
2735 DL.getTypeAllocSize(CDS->getElementType()) * CDS->getNumElements();
2736 assert(EmittedSize <= Size && "Size cannot be less than EmittedSize!")(static_cast <bool> (EmittedSize <= Size && "Size cannot be less than EmittedSize!"
) ? void (0) : __assert_fail ("EmittedSize <= Size && \"Size cannot be less than EmittedSize!\""
, "/build/llvm-toolchain-snapshot-14~++20210926122410+d23fd8ae8906/llvm/lib/CodeGen/AsmPrinter/AsmPrinter.cpp"
, 2736, __extension__ __PRETTY_FUNCTION__))
;
2737 if (unsigned Padding = Size - EmittedSize)
2738 AP.OutStreamer->emitZeros(Padding);
2739}
2740
2741static void emitGlobalConstantArray(const DataLayout &DL,
2742 const ConstantArray *CA, AsmPrinter &AP,
2743 const Constant *BaseCV, uint64_t Offset) {
2744 // See if we can aggregate some values. Make sure it can be
2745 // represented as a series of bytes of the constant value.
2746 int Value = isRepeatedByteSequence(CA, DL);
2747
2748 if (Value != -1) {
2749 uint64_t Bytes = DL.getTypeAllocSize(CA->getType());
2750 AP.OutStreamer->emitFill(Bytes, Value);
2751 }
2752 else {
2753 for (unsigned i = 0, e = CA->getNumOperands(); i != e; ++i) {
2754 emitGlobalConstantImpl(DL, CA->getOperand(i), AP, BaseCV, Offset);
2755 Offset += DL.getTypeAllocSize(CA->getOperand(i)->getType());
2756 }
2757 }
2758}
2759
2760static void emitGlobalConstantVector(const DataLayout &DL,
2761 const ConstantVector *CV, AsmPrinter &AP) {
2762 for (unsigned i = 0, e = CV->getType()->getNumElements(); i != e; ++i)
2763 emitGlobalConstantImpl(DL, CV->getOperand(i), AP);
2764
2765 unsigned Size = DL.getTypeAllocSize(CV->getType());
2766 unsigned EmittedSize = DL.getTypeAllocSize(CV->getType()->getElementType()) *
2767 CV->getType()->getNumElements();
2768 if (unsigned Padding = Size - EmittedSize)
2769 AP.OutStreamer->emitZeros(Padding);
2770}
2771
2772static void emitGlobalConstantStruct(const DataLayout &DL,
2773 const ConstantStruct *CS, AsmPrinter &AP,
2774 const Constant *BaseCV, uint64_t Offset) {
2775 // Print the fields in successive locations. Pad to align if needed!
2776 unsigned Size = DL.getTypeAllocSize(CS->getType());
2777 const StructLayout *Layout = DL.getStructLayout(CS->getType());
2778 uint64_t SizeSoFar = 0;
2779 for (unsigned i = 0, e = CS->getNumOperands(); i != e; ++i) {
2780 const Constant *Field = CS->getOperand(i);
2781
2782 // Print the actual field value.
2783 emitGlobalConstantImpl(DL, Field, AP, BaseCV, Offset + SizeSoFar);
2784
2785 // Check if padding is needed and insert one or more 0s.
2786 uint64_t FieldSize = DL.getTypeAllocSize(Field->getType());
2787 uint64_t PadSize = ((i == e-1 ? Size : Layout->getElementOffset(i+1))
2788 - Layout->getElementOffset(i)) - FieldSize;
2789 SizeSoFar += FieldSize + PadSize;
2790
2791 // Insert padding - this may include padding to increase the size of the
2792 // current field up to the ABI size (if the struct is not packed) as well
2793 // as padding to ensure that the next field starts at the right offset.
2794 AP.OutStreamer->emitZeros(PadSize);
2795 }
2796 assert(SizeSoFar == Layout->getSizeInBytes() &&(static_cast <bool> (SizeSoFar == Layout->getSizeInBytes
() && "Layout of constant struct may be incorrect!") ?
void (0) : __assert_fail ("SizeSoFar == Layout->getSizeInBytes() && \"Layout of constant struct may be incorrect!\""
, "/build/llvm-toolchain-snapshot-14~++20210926122410+d23fd8ae8906/llvm/lib/CodeGen/AsmPrinter/AsmPrinter.cpp"
, 2797, __extension__ __PRETTY_FUNCTION__))
2797 "Layout of constant struct may be incorrect!")(static_cast <bool> (SizeSoFar == Layout->getSizeInBytes
() && "Layout of constant struct may be incorrect!") ?
void (0) : __assert_fail ("SizeSoFar == Layout->getSizeInBytes() && \"Layout of constant struct may be incorrect!\""
, "/build/llvm-toolchain-snapshot-14~++20210926122410+d23fd8ae8906/llvm/lib/CodeGen/AsmPrinter/AsmPrinter.cpp"
, 2797, __extension__ __PRETTY_FUNCTION__))
;
2798}
2799
2800static void emitGlobalConstantFP(APFloat APF, Type *ET, AsmPrinter &AP) {
2801 assert(ET && "Unknown float type")(static_cast <bool> (ET && "Unknown float type"
) ? void (0) : __assert_fail ("ET && \"Unknown float type\""
, "/build/llvm-toolchain-snapshot-14~++20210926122410+d23fd8ae8906/llvm/lib/CodeGen/AsmPrinter/AsmPrinter.cpp"
, 2801, __extension__ __PRETTY_FUNCTION__))
;
2802 APInt API = APF.bitcastToAPInt();
2803
2804 // First print a comment with what we think the original floating-point value
2805 // should have been.
2806 if (AP.isVerbose()) {
2807 SmallString<8> StrVal;
2808 APF.toString(StrVal);
2809 ET->print(AP.OutStreamer->GetCommentOS());
2810 AP.OutStreamer->GetCommentOS() << ' ' << StrVal << '\n';
2811 }
2812
2813 // Now iterate through the APInt chunks, emitting them in endian-correct
2814 // order, possibly with a smaller chunk at beginning/end (e.g. for x87 80-bit
2815 // floats).
2816 unsigned NumBytes = API.getBitWidth() / 8;
2817 unsigned TrailingBytes = NumBytes % sizeof(uint64_t);
2818 const uint64_t *p = API.getRawData();
2819
2820 // PPC's long double has odd notions of endianness compared to how LLVM
2821 // handles it: p[0] goes first for *big* endian on PPC.
2822 if (AP.getDataLayout().isBigEndian() && !ET->isPPC_FP128Ty()) {
2823 int Chunk = API.getNumWords() - 1;
2824
2825 if (TrailingBytes)
2826 AP.OutStreamer->emitIntValueInHexWithPadding(p[Chunk--], TrailingBytes);
2827
2828 for (; Chunk >= 0; --Chunk)
2829 AP.OutStreamer->emitIntValueInHexWithPadding(p[Chunk], sizeof(uint64_t));
2830 } else {
2831 unsigned Chunk;
2832 for (Chunk = 0; Chunk < NumBytes / sizeof(uint64_t); ++Chunk)
2833 AP.OutStreamer->emitIntValueInHexWithPadding(p[Chunk], sizeof(uint64_t));
2834
2835 if (TrailingBytes)
2836 AP.OutStreamer->emitIntValueInHexWithPadding(p[Chunk], TrailingBytes);
2837 }
2838
2839 // Emit the tail padding for the long double.
2840 const DataLayout &DL = AP.getDataLayout();
2841 AP.OutStreamer->emitZeros(DL.getTypeAllocSize(ET) - DL.getTypeStoreSize(ET));
2842}
2843
2844static void emitGlobalConstantFP(const ConstantFP *CFP, AsmPrinter &AP) {
2845 emitGlobalConstantFP(CFP->getValueAPF(), CFP->getType(), AP);
2846}
2847
2848static void emitGlobalConstantLargeInt(const ConstantInt *CI, AsmPrinter &AP) {
2849 const DataLayout &DL = AP.getDataLayout();
2850 unsigned BitWidth = CI->getBitWidth();
2851
2852 // Copy the value as we may massage the layout for constants whose bit width
2853 // is not a multiple of 64-bits.
2854 APInt Realigned(CI->getValue());
2855 uint64_t ExtraBits = 0;
2856 unsigned ExtraBitsSize = BitWidth & 63;
2857
2858 if (ExtraBitsSize) {
2859 // The bit width of the data is not a multiple of 64-bits.
2860 // The extra bits are expected to be at the end of the chunk of the memory.
2861 // Little endian:
2862 // * Nothing to be done, just record the extra bits to emit.
2863 // Big endian:
2864 // * Record the extra bits to emit.
2865 // * Realign the raw data to emit the chunks of 64-bits.
2866 if (DL.isBigEndian()) {
2867 // Basically the structure of the raw data is a chunk of 64-bits cells:
2868 // 0 1 BitWidth / 64
2869 // [chunk1][chunk2] ... [chunkN].
2870 // The most significant chunk is chunkN and it should be emitted first.
2871 // However, due to the alignment issue chunkN contains useless bits.
2872 // Realign the chunks so that they contain only useful information:
2873 // ExtraBits 0 1 (BitWidth / 64) - 1
2874 // chu[nk1 chu][nk2 chu] ... [nkN-1 chunkN]
2875 ExtraBitsSize = alignTo(ExtraBitsSize, 8);
2876 ExtraBits = Realigned.getRawData()[0] &
2877 (((uint64_t)-1) >> (64 - ExtraBitsSize));
2878 Realigned.lshrInPlace(ExtraBitsSize);
2879 } else
2880 ExtraBits = Realigned.getRawData()[BitWidth / 64];
2881 }
2882
2883 // We don't expect assemblers to support integer data directives
2884 // for more than 64 bits, so we emit the data in at most 64-bit
2885 // quantities at a time.
2886 const uint64_t *RawData = Realigned.getRawData();
2887 for (unsigned i = 0, e = BitWidth / 64; i != e; ++i) {
2888 uint64_t Val = DL.isBigEndian() ? RawData[e - i - 1] : RawData[i];
2889 AP.OutStreamer->emitIntValue(Val, 8);
2890 }
2891
2892 if (ExtraBitsSize) {
2893 // Emit the extra bits after the 64-bits chunks.
2894
2895 // Emit a directive that fills the expected size.
2896 uint64_t Size = AP.getDataLayout().getTypeStoreSize(CI->getType());
2897 Size -= (BitWidth / 64) * 8;
2898 assert(Size && Size * 8 >= ExtraBitsSize &&(static_cast <bool> (Size && Size * 8 >= ExtraBitsSize
&& (ExtraBits & (((uint64_t)-1) >> (64 - ExtraBitsSize
))) == ExtraBits && "Directive too small for extra bits."
) ? 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-14~++20210926122410+d23fd8ae8906/llvm/lib/CodeGen/AsmPrinter/AsmPrinter.cpp"
, 2900, __extension__ __PRETTY_FUNCTION__))
2899 (ExtraBits & (((uint64_t)-1) >> (64 - ExtraBitsSize)))(static_cast <bool> (Size && Size * 8 >= ExtraBitsSize
&& (ExtraBits & (((uint64_t)-1) >> (64 - ExtraBitsSize
))) == ExtraBits && "Directive too small for extra bits."
) ? 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-14~++20210926122410+d23fd8ae8906/llvm/lib/CodeGen/AsmPrinter/AsmPrinter.cpp"
, 2900, __extension__ __PRETTY_FUNCTION__))
2900 == ExtraBits && "Directive too small for extra bits.")(static_cast <bool> (Size && Size * 8 >= ExtraBitsSize
&& (ExtraBits & (((uint64_t)-1) >> (64 - ExtraBitsSize
))) == ExtraBits && "Directive too small for extra bits."
) ? 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-14~++20210926122410+d23fd8ae8906/llvm/lib/CodeGen/AsmPrinter/AsmPrinter.cpp"
, 2900, __extension__ __PRETTY_FUNCTION__))
;
2901 AP.OutStreamer->emitIntValue(ExtraBits, Size);
2902 }
2903}
2904
2905/// Transform a not absolute MCExpr containing a reference to a GOT
2906/// equivalent global, by a target specific GOT pc relative access to the
2907/// final symbol.
2908static void handleIndirectSymViaGOTPCRel(AsmPrinter &AP, const MCExpr **ME,
2909 const Constant *BaseCst,
2910 uint64_t Offset) {
2911 // The global @foo below illustrates a global that uses a got equivalent.
2912 //
2913 // @bar = global i32 42
2914 // @gotequiv = private unnamed_addr constant i32* @bar
2915 // @foo = i32 trunc (i64 sub (i64 ptrtoint (i32** @gotequiv to i64),
2916 // i64 ptrtoint (i32* @foo to i64))
2917 // to i32)
2918 //
2919 // The cstexpr in @foo is converted into the MCExpr `ME`, where we actually
2920 // check whether @foo is suitable to use a GOTPCREL. `ME` is usually in the
2921 // form:
2922 //
2923 // foo = cstexpr, where
2924 // cstexpr := <gotequiv> - "." + <cst>
2925 // cstexpr := <gotequiv> - (<foo> - <offset from @foo base>) + <cst>
2926 //
2927 // After canonicalization by evaluateAsRelocatable `ME` turns into:
2928 //
2929 // cstexpr := <gotequiv> - <foo> + gotpcrelcst, where
2930 // gotpcrelcst := <offset from @foo base> + <cst>
2931 MCValue MV;
2932 if (!(*ME)->evaluateAsRelocatable(MV, nullptr, nullptr) || MV.isAbsolute())
2933 return;
2934 const MCSymbolRefExpr *SymA = MV.getSymA();
2935 if (!SymA)
2936 return;
2937
2938 // Check that GOT equivalent symbol is cached.
2939 const MCSymbol *GOTEquivSym = &SymA->getSymbol();
2940 if (!AP.GlobalGOTEquivs.count(GOTEquivSym))
2941 return;
2942
2943 const GlobalValue *BaseGV = dyn_cast_or_null<GlobalValue>(BaseCst);
2944 if (!BaseGV)
2945 return;
2946
2947 // Check for a valid base symbol
2948 const MCSymbol *BaseSym = AP.getSymbol(BaseGV);
2949 const MCSymbolRefExpr *SymB = MV.getSymB();
2950
2951 if (!SymB || BaseSym != &SymB->getSymbol())
2952 return;
2953
2954 // Make sure to match:
2955 //
2956 // gotpcrelcst := <offset from @foo base> + <cst>
2957 //
2958 // If gotpcrelcst is positive it means that we can safely fold the pc rel
2959 // displacement into the GOTPCREL. We can also can have an extra offset <cst>
2960 // if the target knows how to encode it.
2961 int64_t GOTPCRelCst = Offset + MV.getConstant();
2962 if (GOTPCRelCst < 0)
2963 return;
2964 if (!AP.getObjFileLowering().supportGOTPCRelWithOffset() && GOTPCRelCst != 0)
2965 return;
2966
2967 // Emit the GOT PC relative to replace the got equivalent global, i.e.:
2968 //
2969 // bar:
2970 // .long 42
2971 // gotequiv:
2972 // .quad bar
2973 // foo:
2974 // .long gotequiv - "." + <cst>
2975 //
2976 // is replaced by the target specific equivalent to:
2977 //
2978 // bar:
2979 // .long 42
2980 // foo:
2981 // .long bar@GOTPCREL+<gotpcrelcst>
2982 AsmPrinter::GOTEquivUsePair Result = AP.GlobalGOTEquivs[GOTEquivSym];
2983 const GlobalVariable *GV = Result.first;
2984 int NumUses = (int)Result.second;
2985 const GlobalValue *FinalGV = dyn_cast<GlobalValue>(GV->getOperand(0));
2986 const MCSymbol *FinalSym = AP.getSymbol(FinalGV);
2987 *ME = AP.getObjFileLowering().getIndirectSymViaGOTPCRel(
2988 FinalGV, FinalSym, MV, Offset, AP.MMI, *AP.OutStreamer);
2989
2990 // Update GOT equivalent usage information
2991 --NumUses;
2992 if (NumUses >= 0)
2993 AP.GlobalGOTEquivs[GOTEquivSym] = std::make_pair(GV, NumUses);
2994}
2995
2996static void emitGlobalConstantImpl(const DataLayout &DL, const Constant *CV,
2997 AsmPrinter &AP, const Constant *BaseCV,
2998 uint64_t Offset) {
2999 uint64_t Size = DL.getTypeAllocSize(CV->getType());
3000
3001 // Globals with sub-elements such as combinations of arrays and structs
3002 // are handled recursively by emitGlobalConstantImpl. Keep track of the
3003 // constant symbol base and the current position with BaseCV and Offset.
3004 if (!BaseCV && CV->hasOneUse())
3005 BaseCV = dyn_cast<Constant>(CV->user_back());
3006
3007 if (isa<ConstantAggregateZero>(CV) || isa<UndefValue>(CV))
3008 return AP.OutStreamer->emitZeros(Size);
3009
3010 if (const ConstantInt *CI = dyn_cast<ConstantInt>(CV)) {
3011 const uint64_t StoreSize = DL.getTypeStoreSize(CV->getType());
3012
3013 if (StoreSize <= 8) {
3014 if (AP.isVerbose())
3015 AP.OutStreamer->GetCommentOS() << format("0x%" PRIx64"l" "x" "\n",
3016 CI->getZExtValue());
3017 AP.OutStreamer->emitIntValue(CI->getZExtValue(), StoreSize);
3018 } else {
3019 emitGlobalConstantLargeInt(CI, AP);
3020 }
3021
3022 // Emit tail padding if needed
3023 if (Size != StoreSize)
3024 AP.OutStreamer->emitZeros(Size - StoreSize);
3025
3026 return;
3027 }
3028
3029 if (const ConstantFP *CFP = dyn_cast<ConstantFP>(CV))
3030 return emitGlobalConstantFP(CFP, AP);
3031
3032 if (isa<ConstantPointerNull>(CV)) {
3033 AP.OutStreamer->emitIntValue(0, Size);
3034 return;
3035 }
3036
3037 if (const ConstantDataSequential *CDS = dyn_cast<ConstantDataSequential>(CV))
3038 return emitGlobalConstantDataSequential(DL, CDS, AP);
3039
3040 if (const ConstantArray *CVA = dyn_cast<ConstantArray>(CV))
3041 return emitGlobalConstantArray(DL, CVA, AP, BaseCV, Offset);
3042
3043 if (const ConstantStruct *CVS = dyn_cast<ConstantStruct>(CV))
3044 return emitGlobalConstantStruct(DL, CVS, AP, BaseCV, Offset);
3045
3046 if (const ConstantExpr *CE = dyn_cast<ConstantExpr>(CV)) {
3047 // Look through bitcasts, which might not be able to be MCExpr'ized (e.g. of
3048 // vectors).
3049 if (CE->getOpcode() == Instruction::BitCast)
3050 return emitGlobalConstantImpl(DL, CE->getOperand(0), AP);
3051
3052 if (Size > 8) {
3053 // If the constant expression's size is greater than 64-bits, then we have
3054 // to emit the value in chunks. Try to constant fold the value and emit it
3055 // that way.
3056 Constant *New = ConstantFoldConstant(CE, DL);
3057 if (New != CE)
3058 return emitGlobalConstantImpl(DL, New, AP);
3059 }
3060 }
3061
3062 if (const ConstantVector *V = dyn_cast<ConstantVector>(CV))
3063 return emitGlobalConstantVector(DL, V, AP);
3064
3065 // Otherwise, it must be a ConstantExpr. Lower it to an MCExpr, then emit it
3066 // thread the streamer with EmitValue.
3067 const MCExpr *ME = AP.lowerConstant(CV);
3068
3069 // Since lowerConstant already folded and got rid of all IR pointer and
3070 // integer casts, detect GOT equivalent accesses by looking into the MCExpr
3071 // directly.
3072 if (AP.getObjFileLowering().supportIndirectSymViaGOTPCRel())
3073 handleIndirectSymViaGOTPCRel(AP, &ME, BaseCV, Offset);
3074
3075 AP.OutStreamer->emitValue(ME, Size);
3076}
3077
3078/// EmitGlobalConstant - Print a general LLVM constant to the .s file.
3079void AsmPrinter::emitGlobalConstant(const DataLayout &DL, const Constant *CV) {
3080 uint64_t Size = DL.getTypeAllocSize(CV->getType());
3081 if (Size)
3082 emitGlobalConstantImpl(DL, CV, *this);
3083 else if (MAI->hasSubsectionsViaSymbols()) {
3084 // If the global has zero size, emit a single byte so that two labels don't
3085 // look like they are at the same location.
3086 OutStreamer->emitIntValue(0, 1);
3087 }
3088}
3089
3090void AsmPrinter::emitMachineConstantPoolValue(MachineConstantPoolValue *MCPV) {
3091 // Target doesn't support this yet!
3092 llvm_unreachable("Target does not support EmitMachineConstantPoolValue")::llvm::llvm_unreachable_internal("Target does not support EmitMachineConstantPoolValue"
, "/build/llvm-toolchain-snapshot-14~++20210926122410+d23fd8ae8906/llvm/lib/CodeGen/AsmPrinter/AsmPrinter.cpp"
, 3092)
;
3093}
3094
3095void AsmPrinter::printOffset(int64_t Offset, raw_ostream &OS) const {
3096 if (Offset > 0)
3097 OS << '+' << Offset;
3098 else if (Offset < 0)
3099 OS << Offset;
3100}
3101
3102void AsmPrinter::emitNops(unsigned N) {
3103 MCInst Nop = MF->getSubtarget().getInstrInfo()->getNop();
3104 for (; N; --N)
3105 EmitToStreamer(*OutStreamer, Nop);
3106}
3107
3108//===----------------------------------------------------------------------===//
3109// Symbol Lowering Routines.
3110//===----------------------------------------------------------------------===//
3111
3112MCSymbol *AsmPrinter::createTempSymbol(const Twine &Name) const {
3113 return OutContext.createTempSymbol(Name, true);
3114}
3115
3116MCSymbol *AsmPrinter::GetBlockAddressSymbol(const BlockAddress *BA) const {
3117 return MMI->getAddrLabelSymbol(BA->getBasicBlock());
3118}
3119
3120MCSymbol *AsmPrinter::GetBlockAddressSymbol(const BasicBlock *BB) const {
3121 return MMI->getAddrLabelSymbol(BB);
3122}
3123
3124/// GetCPISymbol - Return the symbol for the specified constant pool entry.
3125MCSymbol *AsmPrinter::GetCPISymbol(unsigned CPID) const {
3126 if (getSubtargetInfo().getTargetTriple().isWindowsMSVCEnvironment()) {
3127 const MachineConstantPoolEntry &CPE =
3128 MF->getConstantPool()->getConstants()[CPID];
3129 if (!CPE.isMachineConstantPoolEntry()) {
3130 const DataLayout &DL = MF->getDataLayout();
3131 SectionKind Kind = CPE.getSectionKind(&DL);
3132 const Constant *C = CPE.Val.ConstVal;
3133 Align Alignment = CPE.Alignment;
3134 if (const MCSectionCOFF *S = dyn_cast<MCSectionCOFF>(
3135 getObjFileLowering().getSectionForConstant(DL, Kind, C,
3136 Alignment))) {
3137 if (MCSymbol *Sym = S->getCOMDATSymbol()) {
3138 if (Sym->isUndefined())
3139 OutStreamer->emitSymbolAttribute(Sym, MCSA_Global);
3140 return Sym;
3141 }
3142 }
3143 }
3144 }
3145
3146 const DataLayout &DL = getDataLayout();
3147 return OutContext.getOrCreateSymbol(Twine(DL.getPrivateGlobalPrefix()) +
3148 "CPI" + Twine(getFunctionNumber()) + "_" +
3149 Twine(CPID));
3150}
3151
3152/// GetJTISymbol - Return the symbol for the specified jump table entry.
3153MCSymbol *AsmPrinter::GetJTISymbol(unsigned JTID, bool isLinkerPrivate) const {
3154 return MF->getJTISymbol(JTID, OutContext, isLinkerPrivate);
3155}
3156
3157/// GetJTSetSymbol - Return the symbol for the specified jump table .set
3158/// FIXME: privatize to AsmPrinter.
3159MCSymbol *AsmPrinter::GetJTSetSymbol(unsigned UID, unsigned MBBID) const {
3160 const DataLayout &DL = getDataLayout();
3161 return OutContext.getOrCreateSymbol(Twine(DL.getPrivateGlobalPrefix()) +
3162 Twine(getFunctionNumber()) + "_" +
3163 Twine(UID) + "_set_" + Twine(MBBID));
3164}
3165
3166MCSymbol *AsmPrinter::getSymbolWithGlobalValueBase(const GlobalValue *GV,
3167 StringRef Suffix) const {
3168 return getObjFileLowering().getSymbolWithGlobalValueBase(GV, Suffix, TM);
3169}
3170
3171/// Return the MCSymbol for the specified ExternalSymbol.
3172MCSymbol *AsmPrinter::GetExternalSymbolSymbol(StringRef Sym) const {
3173 SmallString<60> NameStr;
3174 Mangler::getNameWithPrefix(NameStr, Sym, getDataLayout());
3175 return OutContext.getOrCreateSymbol(NameStr);
3176}
3177
3178/// PrintParentLoopComment - Print comments about parent loops of this one.
3179static void PrintParentLoopComment(raw_ostream &OS, const MachineLoop *Loop,
3180 unsigned FunctionNumber) {
3181 if (!Loop) return;
3182 PrintParentLoopComment(OS, Loop->getParentLoop(), FunctionNumber);
3183 OS.indent(Loop->getLoopDepth()*2)
3184 << "Parent Loop BB" << FunctionNumber << "_"
3185 << Loop->getHeader()->getNumber()
3186 << " Depth=" << Loop->getLoopDepth() << '\n';
3187}
3188
3189/// PrintChildLoopComment - Print comments about child loops within
3190/// the loop for this basic block, with nesting.
3191static void PrintChildLoopComment(raw_ostream &OS, const MachineLoop *Loop,
3192 unsigned FunctionNumber) {
3193 // Add child loop information
3194 for (const MachineLoop *CL : *Loop) {
3195 OS.indent(CL->getLoopDepth()*2)
3196 << "Child Loop BB" << FunctionNumber << "_"
3197 << CL->getHeader()->getNumber() << " Depth " << CL->getLoopDepth()
3198 << '\n';
3199 PrintChildLoopComment(OS, CL, FunctionNumber);
3200 }
3201}
3202
3203/// emitBasicBlockLoopComments - Pretty-print comments for basic blocks.
3204static void emitBasicBlockLoopComments(const MachineBasicBlock &MBB,
3205 const MachineLoopInfo *LI,
3206 const AsmPrinter &AP) {
3207 // Add loop depth information
3208 const MachineLoop *Loop = LI->getLoopFor(&MBB);
3209 if (!Loop) return;
3210
3211 MachineBasicBlock *Header = Loop->getHeader();
3212 assert(Header && "No header for loop")(static_cast <bool> (Header && "No header for loop"
) ? void (0) : __assert_fail ("Header && \"No header for loop\""
, "/build/llvm-toolchain-snapshot-14~++20210926122410+d23fd8ae8906/llvm/lib/CodeGen/AsmPrinter/AsmPrinter.cpp"
, 3212, __extension__ __PRETTY_FUNCTION__))
;
3213
3214 // If this block is not a loop header, just print out what is the loop header
3215 // and return.
3216 if (Header != &MBB) {
3217 AP.OutStreamer->AddComment(" in Loop: Header=BB" +
3218 Twine(AP.getFunctionNumber())+"_" +
3219 Twine(Loop->getHeader()->getNumber())+
3220 " Depth="+Twine(Loop->getLoopDepth()));
3221 return;
3222 }
3223
3224 // Otherwise, it is a loop header. Print out information about child and
3225 // parent loops.
3226 raw_ostream &OS = AP.OutStreamer->GetCommentOS();
3227
3228 PrintParentLoopComment(OS, Loop->getParentLoop(), AP.getFunctionNumber());
3229
3230 OS << "=>";
3231 OS.indent(Loop->getLoopDepth()*2-2);
3232
3233 OS << "This ";
3234 if (Loop->isInnermost())
3235 OS << "Inner ";
3236 OS << "Loop Header: Depth=" + Twine(Loop->getLoopDepth()) << '\n';
3237
3238 PrintChildLoopComment(OS, Loop, AP.getFunctionNumber());
3239}
3240
3241/// emitBasicBlockStart - This method prints the label for the specified
3242/// MachineBasicBlock, an alignment (if present) and a comment describing
3243/// it if appropriate.
3244void AsmPrinter::emitBasicBlockStart(const MachineBasicBlock &MBB) {
3245 // End the previous funclet and start a new one.
3246 if (MBB.isEHFuncletEntry()) {
3247 for (const HandlerInfo &HI : Handlers) {
3248 HI.Handler->endFunclet();
3249 HI.Handler->beginFunclet(MBB);
3250 }
3251 }
3252
3253 // Emit an alignment directive for this block, if needed.
3254 const Align Alignment = MBB.getAlignment();
3255 if (Alignment != Align(1))
3256 emitAlignment(Alignment);
3257
3258 // Switch to a new section if this basic block must begin a section. The
3259 // entry block is always placed in the function section and is handled
3260 // separately.
3261 if (MBB.isBeginSection() && !MBB.isEntryBlock()) {
3262 OutStreamer->SwitchSection(
3263 getObjFileLowering().getSectionForMachineBasicBlock(MF->getFunction(),
3264 MBB, TM));
3265 CurrentSectionBeginSym = MBB.getSymbol();
3266 }
3267
3268 // If the block has its address taken, emit any labels that were used to
3269 // reference the block. It is possible that there is more than one label
3270 // here, because multiple LLVM BB's may have been RAUW'd to this block after
3271 // the references were generated.
3272 const BasicBlock *BB = MBB.getBasicBlock();
3273 if (MBB.hasAddressTaken()) {
3274 if (isVerbose())
3275 OutStreamer->AddComment("Block address taken");
3276
3277 // MBBs can have their address taken as part of CodeGen without having
3278 // their corresponding BB's address taken in IR
3279 if (BB && BB->hasAddressTaken())
3280 for (MCSymbol *Sym : MMI->getAddrLabelSymbolToEmit(BB))
3281 OutStreamer->emitLabel(Sym);
3282 }
3283
3284 // Print some verbose block comments.
3285 if (isVerbose()) {
3286 if (BB) {
3287 if (BB->hasName()) {
3288 BB->printAsOperand(OutStreamer->GetCommentOS(),
3289 /*PrintType=*/false, BB->getModule());
3290 OutStreamer->GetCommentOS() << '\n';
3291 }
3292 }
3293
3294 assert(MLI != nullptr && "MachineLoopInfo should has been computed")(static_cast <bool> (MLI != nullptr && "MachineLoopInfo should has been computed"
) ? void (0) : __assert_fail ("MLI != nullptr && \"MachineLoopInfo should has been computed\""
, "/build/llvm-toolchain-snapshot-14~++20210926122410+d23fd8ae8906/llvm/lib/CodeGen/AsmPrinter/AsmPrinter.cpp"
, 3294, __extension__ __PRETTY_FUNCTION__))
;
3295 emitBasicBlockLoopComments(MBB, MLI, *this);
3296 }
3297
3298 // Print the main label for the block.
3299 if (shouldEmitLabelForBasicBlock(MBB)) {
3300 if (isVerbose() && MBB.hasLabelMustBeEmitted())
3301 OutStreamer->AddComment("Label of block must be emitted");
3302 OutStreamer->emitLabel(MBB.getSymbol());
3303 } else {
3304 if (isVerbose()) {
3305 // NOTE: Want this comment at start of line, don't emit with AddComment.
3306 OutStreamer->emitRawComment(" %bb." + Twine(MBB.getNumber()) + ":",
3307 false);
3308 }
3309 }
3310
3311 if (MBB.isEHCatchretTarget() &&
3312 MAI->getExceptionHandlingType() == ExceptionHandling::WinEH) {
3313 OutStreamer->emitLabel(MBB.getEHCatchretSymbol());
3314 }
3315
3316 // With BB sections, each basic block must handle CFI information on its own
3317 // if it begins a section (Entry block is handled separately by
3318 // AsmPrinterHandler::beginFunction).
3319 if (MBB.isBeginSection() && !MBB.isEntryBlock())
3320 for (const HandlerInfo &HI : Handlers)
3321 HI.Handler->beginBasicBlock(MBB);
3322}
3323
3324void AsmPrinter::emitBasicBlockEnd(const MachineBasicBlock &MBB) {
3325 // Check if CFI information needs to be updated for this MBB with basic block
3326 // sections.
3327 if (MBB.isEndSection())
3328 for (const HandlerInfo &HI : Handlers)
3329 HI.Handler->endBasicBlock(MBB);
3330}
3331
3332void AsmPrinter::emitVisibility(MCSymbol *Sym, unsigned Visibility,
3333 bool IsDefinition) const {
3334 MCSymbolAttr Attr = MCSA_Invalid;
3335
3336 switch (Visibility) {
3337 default: break;
3338 case GlobalValue::HiddenVisibility:
3339 if (IsDefinition)
3340 Attr = MAI->getHiddenVisibilityAttr();
3341 else
3342 Attr = MAI->getHiddenDeclarationVisibilityAttr();
3343 break;
3344 case GlobalValue::ProtectedVisibility:
3345 Attr = MAI->getProtectedVisibilityAttr();
3346 break;
3347 }
3348
3349 if (Attr != MCSA_Invalid)
3350 OutStreamer->emitSymbolAttribute(Sym, Attr);
3351}
3352
3353bool AsmPrinter::shouldEmitLabelForBasicBlock(
3354 const MachineBasicBlock &MBB) const {
3355 // With `-fbasic-block-sections=`, a label is needed for every non-entry block
3356 // in the labels mode (option `=labels`) and every section beginning in the
3357 // sections mode (`=all` and `=list=`).
3358 if ((MF->hasBBLabels() || MBB.isBeginSection()) && !MBB.isEntryBlock())
3359 return true;
3360 // A label is needed for any block with at least one predecessor (when that
3361 // predecessor is not the fallthrough predecessor, or if it is an EH funclet
3362 // entry, or if a label is forced).
3363 return !MBB.pred_empty() &&
3364 (!isBlockOnlyReachableByFallthrough(&MBB) || MBB.isEHFuncletEntry() ||
3365 MBB.hasLabelMustBeEmitted());
3366}
3367
3368/// isBlockOnlyReachableByFallthough - Return true if the basic block has
3369/// exactly one predecessor and the control transfer mechanism between
3370/// the predecessor and this block is a fall-through.
3371bool AsmPrinter::
3372isBlockOnlyReachableByFallthrough(const MachineBasicBlock *MBB) const {
3373 // If this is a landing pad, it isn't a fall through. If it has no preds,
3374 // then nothing falls through to it.
3375 if (MBB->isEHPad() || MBB->pred_empty())
3376 return false;
3377
3378 // If there isn't exactly one predecessor, it can't be a fall through.
3379 if (MBB->pred_size() > 1)
3380 return false;
3381
3382 // The predecessor has to be immediately before this block.
3383 MachineBasicBlock *Pred = *MBB->pred_begin();
3384 if (!Pred->isLayoutSuccessor(MBB))
3385 return false;
3386
3387 // If the block is completely empty, then it definitely does fall through.
3388 if (Pred->empty())
3389 return true;
3390
3391 // Check the terminators in the previous blocks
3392 for (const auto &MI : Pred->terminators()) {
3393 // If it is not a simple branch, we are in a table somewhere.
3394 if (!MI.isBranch() || MI.isIndirectBranch())
3395 return false;
3396
3397 // If we are the operands of one of the branches, this is not a fall
3398 // through. Note that targets with delay slots will usually bundle
3399 // terminators with the delay slot instruction.
3400 for (ConstMIBundleOperands OP(MI); OP.isValid(); ++OP) {
3401 if (OP->isJTI())
3402 return false;
3403 if (OP->isMBB() && OP->getMBB() == MBB)
3404 return false;
3405 }
3406 }
3407
3408 return true;
3409}
3410
3411GCMetadataPrinter *AsmPrinter::GetOrCreateGCPrinter(GCStrategy &S) {
3412 if (!S.usesMetadata())
3413 return nullptr;
3414
3415 gcp_map_type &GCMap = getGCMap(GCMetadataPrinters);
3416 gcp_map_type::iterator GCPI = GCMap.find(&S);
3417 if (GCPI != GCMap.end())
3418 return GCPI->second.get();
3419
3420 auto Name = S.getName();
3421
3422 for (const GCMetadataPrinterRegistry::entry &GCMetaPrinter :
3423 GCMetadataPrinterRegistry::entries())
3424 if (Name == GCMetaPrinter.getName()) {
3425 std::unique_ptr<GCMetadataPrinter> GMP = GCMetaPrinter.instantiate();
3426 GMP->S = &S;
3427 auto IterBool = GCMap.insert(std::make_pair(&S, std::move(GMP)));
3428 return IterBool.first->second.get();
3429 }
3430
3431 report_fatal_error("no GCMetadataPrinter registered for GC: " + Twine(Name));
3432}
3433
3434void AsmPrinter::emitStackMaps(StackMaps &SM) {
3435 GCModuleInfo *MI = getAnalysisIfAvailable<GCModuleInfo>();
3436 assert(MI && "AsmPrinter didn't require GCModuleInfo?")(static_cast <bool> (MI && "AsmPrinter didn't require GCModuleInfo?"
) ? void (0) : __assert_fail ("MI && \"AsmPrinter didn't require GCModuleInfo?\""
, "/build/llvm-toolchain-snapshot-14~++20210926122410+d23fd8ae8906/llvm/lib/CodeGen/AsmPrinter/AsmPrinter.cpp"
, 3436, __extension__ __PRETTY_FUNCTION__))
;
3437 bool NeedsDefault = false;
3438 if (MI->begin() == MI->end())
3439 // No GC strategy, use the default format.
3440 NeedsDefault = true;
3441 else
3442 for (auto &I : *MI) {
3443 if (GCMetadataPrinter *MP = GetOrCreateGCPrinter(*I))
3444 if (MP->emitStackMaps(SM, *this))
3445 continue;
3446 // The strategy doesn't have printer or doesn't emit custom stack maps.
3447 // Use the default format.
3448 NeedsDefault = true;
3449 }
3450
3451 if (NeedsDefault)
3452 SM.serializeToStackMapSection();
3453}
3454
3455/// Pin vtable to this file.
3456AsmPrinterHandler::~AsmPrinterHandler() = default;
3457
3458void AsmPrinterHandler::markFunctionEnd() {}
3459
3460// In the binary's "xray_instr_map" section, an array of these function entries
3461// describes each instrumentation point. When XRay patches your code, the index
3462// into this table will be given to your handler as a patch point identifier.
3463void AsmPrinter::XRayFunctionEntry::emit(int Bytes, MCStreamer *Out) const {
3464 auto Kind8 = static_cast<uint8_t>(Kind);
3465 Out->emitBinaryData(StringRef(reinterpret_cast<const char *>(&Kind8), 1));
3466 Out->emitBinaryData(
3467 StringRef(reinterpret_cast<const char *>(&AlwaysInstrument), 1));
3468 Out->emitBinaryData(StringRef(reinterpret_cast<const char *>(&Version), 1));
3469 auto Padding = (4 * Bytes) - ((2 * Bytes) + 3);
3470 assert(Padding >= 0 && "Instrumentation map entry > 4 * Word Size")(static_cast <bool> (Padding >= 0 && "Instrumentation map entry > 4 * Word Size"
) ? void (0) : __assert_fail ("Padding >= 0 && \"Instrumentation map entry > 4 * Word Size\""
, "/build/llvm-toolchain-snapshot-14~++20210926122410+d23fd8ae8906/llvm/lib/CodeGen/AsmPrinter/AsmPrinter.cpp"
, 3470, __extension__ __PRETTY_FUNCTION__))
;
3471 Out->emitZeros(Padding);
3472}
3473
3474void AsmPrinter::emitXRayTable() {
3475 if (Sleds.empty())
3476 return;
3477
3478 auto PrevSection = OutStreamer->getCurrentSectionOnly();
3479 const Function &F = MF->getFunction();
3480 MCSection *InstMap = nullptr;
3481 MCSection *FnSledIndex = nullptr;
3482 const Triple &TT = TM.getTargetTriple();
3483 // Use PC-relative addresses on all targets.
3484 if (TT.isOSBinFormatELF()) {
3485 auto LinkedToSym = cast<MCSymbolELF>(CurrentFnSym);
3486 auto Flags = ELF::SHF_ALLOC | ELF::SHF_LINK_ORDER;
3487 StringRef GroupName;
3488 if (F.hasComdat()) {
3489 Flags |= ELF::SHF_GROUP;
3490 GroupName = F.getComdat()->getName();
3491 }
3492 InstMap = OutContext.getELFSection("xray_instr_map", ELF::SHT_PROGBITS,
3493 Flags, 0, GroupName, F.hasComdat(),
3494 MCSection::NonUniqueID, LinkedToSym);
3495
3496 if (!TM.Options.XRayOmitFunctionIndex)
3497 FnSledIndex = OutContext.getELFSection(
3498 "xray_fn_idx", ELF::SHT_PROGBITS, Flags | ELF::SHF_WRITE, 0,
3499 GroupName, F.hasComdat(), MCSection::NonUniqueID, LinkedToSym);
3500 } else if (MF->getSubtarget().getTargetTriple().isOSBinFormatMachO()) {
3501 InstMap = OutContext.getMachOSection("__DATA", "xray_instr_map", 0,
3502 SectionKind::getReadOnlyWithRel());
3503 if (!TM.Options.XRayOmitFunctionIndex)
3504 FnSledIndex = OutContext.getMachOSection(
3505 "__DATA", "xray_fn_idx", 0, SectionKind::getReadOnlyWithRel());
3506 } else {
3507 llvm_unreachable("Unsupported target")::llvm::llvm_unreachable_internal("Unsupported target", "/build/llvm-toolchain-snapshot-14~++20210926122410+d23fd8ae8906/llvm/lib/CodeGen/AsmPrinter/AsmPrinter.cpp"
, 3507)
;
3508 }
3509
3510 auto WordSizeBytes = MAI->getCodePointerSize();
3511
3512 // Now we switch to the instrumentation map section. Because this is done
3513 // per-function, we are able to create an index entry that will represent the
3514 // range of sleds associated with a function.
3515 auto &Ctx = OutContext;
3516 MCSymbol *SledsStart = OutContext.createTempSymbol("xray_sleds_start", true);
3517 OutStreamer->SwitchSection(InstMap);
3518 OutStreamer->emitLabel(SledsStart);
3519 for (const auto &Sled : Sleds) {
3520 MCSymbol *Dot = Ctx.createTempSymbol();
3521 OutStreamer->emitLabel(Dot);
3522 OutStreamer->emitValueImpl(
3523 MCBinaryExpr::createSub(MCSymbolRefExpr::create(Sled.Sled, Ctx),
3524 MCSymbolRefExpr::create(Dot, Ctx), Ctx),
3525 WordSizeBytes);
3526 OutStreamer->emitValueImpl(
3527 MCBinaryExpr::createSub(
3528 MCSymbolRefExpr::create(CurrentFnBegin, Ctx),
3529 MCBinaryExpr::createAdd(MCSymbolRefExpr::create(Dot, Ctx),
3530 MCConstantExpr::create(WordSizeBytes, Ctx),
3531 Ctx),
3532 Ctx),
3533 WordSizeBytes);
3534 Sled.emit(WordSizeBytes, OutStreamer.get());
3535 }
3536 MCSymbol *SledsEnd = OutContext.createTempSymbol("xray_sleds_end", true);
3537 OutStreamer->emitLabel(SledsEnd);
3538
3539 // We then emit a single entry in the index per function. We use the symbols
3540 // that bound the instrumentation map as the range for a specific function.
3541 // Each entry here will be 2 * word size aligned, as we're writing down two
3542 // pointers. This should work for both 32-bit and 64-bit platforms.
3543 if (FnSledIndex) {
3544 OutStreamer->SwitchSection(FnSledIndex);
3545 OutStreamer->emitCodeAlignment(2 * WordSizeBytes, &getSubtargetInfo());
3546 OutStreamer->emitSymbolValue(SledsStart, WordSizeBytes, false);
3547 OutStreamer->emitSymbolValue(SledsEnd, WordSizeBytes, false);
3548 OutStreamer->SwitchSection(PrevSection);
3549 }
3550 Sleds.clear();
3551}
3552
3553void AsmPrinter::recordSled(MCSymbol *Sled, const MachineInstr &MI,
3554 SledKind Kind, uint8_t Version) {
3555 const Function &F = MI.getMF()->getFunction();
3556 auto Attr = F.getFnAttribute("function-instrument");
3557 bool LogArgs = F.hasFnAttribute("xray-log-args");
3558 bool AlwaysInstrument =
3559 Attr.isStringAttribute() && Attr.getValueAsString() == "xray-always";
3560 if (Kind == SledKind::FUNCTION_ENTER && LogArgs)
3561 Kind = SledKind::LOG_ARGS_ENTER;
3562 Sleds.emplace_back(XRayFunctionEntry{Sled, CurrentFnSym, Kind,
3563 AlwaysInstrument, &F, Version});
3564}
3565
3566void AsmPrinter::emitPatchableFunctionEntries() {
3567 const Function &F = MF->getFunction();
3568 unsigned PatchableFunctionPrefix = 0, PatchableFunctionEntry = 0;
3569 (void)F.getFnAttribute("patchable-function-prefix")
3570 .getValueAsString()
3571 .getAsInteger(10, PatchableFunctionPrefix);
3572 (void)F.getFnAttribute("patchable-function-entry")
3573 .getValueAsString()
3574 .getAsInteger(10, PatchableFunctionEntry);
3575 if (!PatchableFunctionPrefix && !PatchableFunctionEntry)
3576 return;
3577 const unsigned PointerSize = getPointerSize();
3578 if (TM.getTargetTriple().isOSBinFormatELF()) {
3579 auto Flags = ELF::SHF_WRITE | ELF::SHF_ALLOC;
3580 const MCSymbolELF *LinkedToSym = nullptr;
3581 StringRef GroupName;
3582
3583 // GNU as < 2.35 did not support section flag 'o'. GNU ld < 2.36 did not
3584 // support mixed SHF_LINK_ORDER and non-SHF_LINK_ORDER sections.
3585 if (MAI->useIntegratedAssembler() || MAI->binutilsIsAtLeast(2, 36)) {
3586 Flags |= ELF::SHF_LINK_ORDER;
3587 if (F.hasComdat()) {
3588 Flags |= ELF::SHF_GROUP;
3589 GroupName = F.getComdat()->getName();
3590 }
3591 LinkedToSym = cast<MCSymbolELF>(CurrentFnSym);
3592 }
3593 OutStreamer->SwitchSection(OutContext.getELFSection(
3594 "__patchable_function_entries", ELF::SHT_PROGBITS, Flags, 0, GroupName,
3595 F.hasComdat(), MCSection::NonUniqueID, LinkedToSym));
3596 emitAlignment(Align(PointerSize));
3597 OutStreamer->emitSymbolValue(CurrentPatchableFunctionEntrySym, PointerSize);
3598 }
3599}
3600
3601uint16_t AsmPrinter::getDwarfVersion() const {
3602 return OutStreamer->getContext().getDwarfVersion();
3603}
3604
3605void AsmPrinter::setDwarfVersion(uint16_t Version) {
3606 OutStreamer->getContext().setDwarfVersion(Version);
3607}
3608
3609bool AsmPrinter::isDwarf64() const {
3610 return OutStreamer->getContext().getDwarfFormat() == dwarf::DWARF64;
3611}
3612
3613unsigned int AsmPrinter::getDwarfOffsetByteSize() const {
3614 return dwarf::getDwarfOffsetByteSize(
3615 OutStreamer->getContext().getDwarfFormat());
3616}
3617
3618unsigned int AsmPrinter::getUnitLengthFieldByteSize() const {
3619 return dwarf::getUnitLengthFieldByteSize(
3620 OutStreamer->getContext().getDwarfFormat());
3621}