Bug Summary

File:llvm/lib/CodeGen/AsmPrinter/AsmPrinter.cpp
Warning:line 279, 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 -fhalf-no-semantic-interposition -mframe-pointer=none -fmath-errno -fno-rounding-math -mconstructor-aliases -munwind-tables -target-cpu x86-64 -tune-cpu generic -fno-split-dwarf-inlining -debugger-tuning=gdb -ffunction-sections -fdata-sections -resource-dir /usr/lib/llvm-12/lib/clang/12.0.0 -D _DEBUG -D _GNU_SOURCE -D __STDC_CONSTANT_MACROS -D __STDC_FORMAT_MACROS -D __STDC_LIMIT_MACROS -I /build/llvm-toolchain-snapshot-12~++20210115100614+a14c36fe27f5/build-llvm/lib/CodeGen/AsmPrinter -I /build/llvm-toolchain-snapshot-12~++20210115100614+a14c36fe27f5/llvm/lib/CodeGen/AsmPrinter -I /build/llvm-toolchain-snapshot-12~++20210115100614+a14c36fe27f5/build-llvm/include -I /build/llvm-toolchain-snapshot-12~++20210115100614+a14c36fe27f5/llvm/include -U NDEBUG -internal-isystem /usr/lib/gcc/x86_64-linux-gnu/6.3.0/../../../../include/c++/6.3.0 -internal-isystem /usr/lib/gcc/x86_64-linux-gnu/6.3.0/../../../../include/x86_64-linux-gnu/c++/6.3.0 -internal-isystem /usr/lib/gcc/x86_64-linux-gnu/6.3.0/../../../../include/x86_64-linux-gnu/c++/6.3.0 -internal-isystem /usr/lib/gcc/x86_64-linux-gnu/6.3.0/../../../../include/c++/6.3.0/backward -internal-isystem /usr/local/include -internal-isystem /usr/lib/llvm-12/lib/clang/12.0.0/include -internal-externc-isystem /usr/include/x86_64-linux-gnu -internal-externc-isystem /include -internal-externc-isystem /usr/include -O2 -Wno-unused-parameter -Wwrite-strings -Wno-missing-field-initializers -Wno-long-long -Wno-maybe-uninitialized -Wno-comment -std=c++14 -fdeprecated-macro -fdebug-compilation-dir /build/llvm-toolchain-snapshot-12~++20210115100614+a14c36fe27f5/build-llvm/lib/CodeGen/AsmPrinter -fdebug-prefix-map=/build/llvm-toolchain-snapshot-12~++20210115100614+a14c36fe27f5=. -ferror-limit 19 -fvisibility-inlines-hidden -stack-protector 2 -fgnuc-version=4.2.1 -vectorize-loops -vectorize-slp -analyzer-output=html -analyzer-config stable-report-filename=true -faddrsig -o /tmp/scan-build-2021-01-16-002530-32805-1 -x c++ /build/llvm-toolchain-snapshot-12~++20210115100614+a14c36fe27f5/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/GCStrategy.h"
42#include "llvm/CodeGen/MachineBasicBlock.h"
43#include "llvm/CodeGen/MachineConstantPool.h"
44#include "llvm/CodeGen/MachineDominators.h"
45#include "llvm/CodeGen/MachineFrameInfo.h"
46#include "llvm/CodeGen/MachineFunction.h"
47#include "llvm/CodeGen/MachineFunctionPass.h"
48#include "llvm/CodeGen/MachineInstr.h"
49#include "llvm/CodeGen/MachineInstrBundle.h"
50#include "llvm/CodeGen/MachineJumpTableInfo.h"
51#include "llvm/CodeGen/MachineLoopInfo.h"
52#include "llvm/CodeGen/MachineMemOperand.h"
53#include "llvm/CodeGen/MachineModuleInfo.h"
54#include "llvm/CodeGen/MachineModuleInfoImpls.h"
55#include "llvm/CodeGen/MachineOperand.h"
56#include "llvm/CodeGen/MachineOptimizationRemarkEmitter.h"
57#include "llvm/CodeGen/StackMaps.h"
58#include "llvm/CodeGen/TargetFrameLowering.h"
59#include "llvm/CodeGen/TargetInstrInfo.h"
60#include "llvm/CodeGen/TargetLowering.h"
61#include "llvm/CodeGen/TargetOpcodes.h"
62#include "llvm/CodeGen/TargetRegisterInfo.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/GlobalAlias.h"
72#include "llvm/IR/GlobalIFunc.h"
73#include "llvm/IR/GlobalIndirectSymbol.h"
74#include "llvm/IR/GlobalObject.h"
75#include "llvm/IR/GlobalValue.h"
76#include "llvm/IR/GlobalVariable.h"
77#include "llvm/IR/Instruction.h"
78#include "llvm/IR/Mangler.h"
79#include "llvm/IR/Metadata.h"
80#include "llvm/IR/Module.h"
81#include "llvm/IR/Operator.h"
82#include "llvm/IR/PseudoProbe.h"
83#include "llvm/IR/Type.h"
84#include "llvm/IR/Value.h"
85#include "llvm/MC/MCAsmInfo.h"
86#include "llvm/MC/MCContext.h"
87#include "llvm/MC/MCDirectives.h"
88#include "llvm/MC/MCDwarf.h"
89#include "llvm/MC/MCExpr.h"
90#include "llvm/MC/MCInst.h"
91#include "llvm/MC/MCSection.h"
92#include "llvm/MC/MCSectionCOFF.h"
93#include "llvm/MC/MCSectionELF.h"
94#include "llvm/MC/MCSectionMachO.h"
95#include "llvm/MC/MCSectionXCOFF.h"
96#include "llvm/MC/MCStreamer.h"
97#include "llvm/MC/MCSubtargetInfo.h"
98#include "llvm/MC/MCSymbol.h"
99#include "llvm/MC/MCSymbolELF.h"
100#include "llvm/MC/MCSymbolXCOFF.h"
101#include "llvm/MC/MCTargetOptions.h"
102#include "llvm/MC/MCValue.h"
103#include "llvm/MC/SectionKind.h"
104#include "llvm/Pass.h"
105#include "llvm/Remarks/Remark.h"
106#include "llvm/Remarks/RemarkFormat.h"
107#include "llvm/Remarks/RemarkStreamer.h"
108#include "llvm/Remarks/RemarkStringTable.h"
109#include "llvm/Support/Casting.h"
110#include "llvm/Support/CommandLine.h"
111#include "llvm/Support/Compiler.h"
112#include "llvm/Support/ErrorHandling.h"
113#include "llvm/Support/Format.h"
114#include "llvm/Support/MathExtras.h"
115#include "llvm/Support/Path.h"
116#include "llvm/Support/TargetRegistry.h"
117#include "llvm/Support/Timer.h"
118#include "llvm/Support/raw_ostream.h"
119#include "llvm/Target/TargetLoweringObjectFile.h"
120#include "llvm/Target/TargetMachine.h"
121#include "llvm/Target/TargetOptions.h"
122#include <algorithm>
123#include <cassert>
124#include <cinttypes>
125#include <cstdint>
126#include <iterator>
127#include <limits>
128#include <memory>
129#include <string>
130#include <utility>
131#include <vector>
132
133using namespace llvm;
134
135#define DEBUG_TYPE"asm-printer" "asm-printer"
136
137// FIXME: this option currently only applies to DWARF, and not CodeView, tables
138static cl::opt<bool>
139 DisableDebugInfoPrinting("disable-debug-info-print", cl::Hidden,
140 cl::desc("Disable debug info printing"));
141
142const char DWARFGroupName[] = "dwarf";
143const char DWARFGroupDescription[] = "DWARF Emission";
144const char DbgTimerName[] = "emit";
145const char DbgTimerDescription[] = "Debug Info Emission";
146const char EHTimerName[] = "write_exception";
147const char EHTimerDescription[] = "DWARF Exception Writer";
148const char CFGuardName[] = "Control Flow Guard";
149const char CFGuardDescription[] = "Control Flow Guard";
150const char CodeViewLineTablesGroupName[] = "linetables";
151const char CodeViewLineTablesGroupDescription[] = "CodeView Line Tables";
152const char PPTimerName[] = "emit";
153const char PPTimerDescription[] = "Pseudo Probe Emission";
154const char PPGroupName[] = "pseudo probe";
155const char PPGroupDescription[] = "Pseudo Probe Emission";
156
157STATISTIC(EmittedInsts, "Number of machine instrs printed")static llvm::Statistic EmittedInsts = {"asm-printer", "EmittedInsts"
, "Number of machine instrs printed"}
;
158
159char AsmPrinter::ID = 0;
160
161using gcp_map_type = DenseMap<GCStrategy *, std::unique_ptr<GCMetadataPrinter>>;
162
163static gcp_map_type &getGCMap(void *&P) {
164 if (!P)
165 P = new gcp_map_type();
166 return *(gcp_map_type*)P;
167}
168
169/// getGVAlignment - Return the alignment to use for the specified global
170/// value. This rounds up to the preferred alignment if possible and legal.
171Align AsmPrinter::getGVAlignment(const GlobalObject *GV, const DataLayout &DL,
172 Align InAlign) {
173 Align Alignment;
174 if (const GlobalVariable *GVar = dyn_cast<GlobalVariable>(GV))
175 Alignment = DL.getPreferredAlign(GVar);
176
177 // If InAlign is specified, round it to it.
178 if (InAlign > Alignment)
179 Alignment = InAlign;
180
181 // If the GV has a specified alignment, take it into account.
182 const MaybeAlign GVAlign(GV->getAlignment());
183 if (!GVAlign)
184 return Alignment;
185
186 assert(GVAlign && "GVAlign must be set")((GVAlign && "GVAlign must be set") ? static_cast<
void> (0) : __assert_fail ("GVAlign && \"GVAlign must be set\""
, "/build/llvm-toolchain-snapshot-12~++20210115100614+a14c36fe27f5/llvm/lib/CodeGen/AsmPrinter/AsmPrinter.cpp"
, 186, __PRETTY_FUNCTION__))
;
187
188 // If the GVAlign is larger than NumBits, or if we are required to obey
189 // NumBits because the GV has an assigned section, obey it.
190 if (*GVAlign > Alignment || GV->hasSection())
191 Alignment = *GVAlign;
192 return Alignment;
193}
194
195AsmPrinter::AsmPrinter(TargetMachine &tm, std::unique_ptr<MCStreamer> Streamer)
196 : MachineFunctionPass(ID), TM(tm), MAI(tm.getMCAsmInfo()),
197 OutContext(Streamer->getContext()), OutStreamer(std::move(Streamer)) {
198 VerboseAsm = OutStreamer->isVerboseAsm();
199}
200
201AsmPrinter::~AsmPrinter() {
202 assert(!DD && Handlers.size() == NumUserHandlers &&((!DD && Handlers.size() == NumUserHandlers &&
"Debug/EH info didn't get finalized") ? static_cast<void>
(0) : __assert_fail ("!DD && Handlers.size() == NumUserHandlers && \"Debug/EH info didn't get finalized\""
, "/build/llvm-toolchain-snapshot-12~++20210115100614+a14c36fe27f5/llvm/lib/CodeGen/AsmPrinter/AsmPrinter.cpp"
, 203, __PRETTY_FUNCTION__))
203 "Debug/EH info didn't get finalized")((!DD && Handlers.size() == NumUserHandlers &&
"Debug/EH info didn't get finalized") ? static_cast<void>
(0) : __assert_fail ("!DD && Handlers.size() == NumUserHandlers && \"Debug/EH info didn't get finalized\""
, "/build/llvm-toolchain-snapshot-12~++20210115100614+a14c36fe27f5/llvm/lib/CodeGen/AsmPrinter/AsmPrinter.cpp"
, 203, __PRETTY_FUNCTION__))
;
204
205 if (GCMetadataPrinters) {
206 gcp_map_type &GCMap = getGCMap(GCMetadataPrinters);
207
208 delete &GCMap;
209 GCMetadataPrinters = nullptr;
210 }
211}
212
213bool AsmPrinter::isPositionIndependent() const {
214 return TM.isPositionIndependent();
215}
216
217/// getFunctionNumber - Return a unique ID for the current function.
218unsigned AsmPrinter::getFunctionNumber() const {
219 return MF->getFunctionNumber();
220}
221
222const TargetLoweringObjectFile &AsmPrinter::getObjFileLowering() const {
223 return *TM.getObjFileLowering();
224}
225
226const DataLayout &AsmPrinter::getDataLayout() const {
227 return MMI->getModule()->getDataLayout();
228}
229
230// Do not use the cached DataLayout because some client use it without a Module
231// (dsymutil, llvm-dwarfdump).
232unsigned AsmPrinter::getPointerSize() const {
233 return TM.getPointerSize(0); // FIXME: Default address space
234}
235
236const MCSubtargetInfo &AsmPrinter::getSubtargetInfo() const {
237 assert(MF && "getSubtargetInfo requires a valid MachineFunction!")((MF && "getSubtargetInfo requires a valid MachineFunction!"
) ? static_cast<void> (0) : __assert_fail ("MF && \"getSubtargetInfo requires a valid MachineFunction!\""
, "/build/llvm-toolchain-snapshot-12~++20210115100614+a14c36fe27f5/llvm/lib/CodeGen/AsmPrinter/AsmPrinter.cpp"
, 237, __PRETTY_FUNCTION__))
;
238 return MF->getSubtarget<MCSubtargetInfo>();
239}
240
241void AsmPrinter::EmitToStreamer(MCStreamer &S, const MCInst &Inst) {
242 S.emitInstruction(Inst, getSubtargetInfo());
243}
244
245void AsmPrinter::emitInitialRawDwarfLocDirective(const MachineFunction &MF) {
246 if (DD) {
247 assert(OutStreamer->hasRawTextSupport() &&((OutStreamer->hasRawTextSupport() && "Expected assembly output mode."
) ? static_cast<void> (0) : __assert_fail ("OutStreamer->hasRawTextSupport() && \"Expected assembly output mode.\""
, "/build/llvm-toolchain-snapshot-12~++20210115100614+a14c36fe27f5/llvm/lib/CodeGen/AsmPrinter/AsmPrinter.cpp"
, 248, __PRETTY_FUNCTION__))
248 "Expected assembly output mode.")((OutStreamer->hasRawTextSupport() && "Expected assembly output mode."
) ? static_cast<void> (0) : __assert_fail ("OutStreamer->hasRawTextSupport() && \"Expected assembly output mode.\""
, "/build/llvm-toolchain-snapshot-12~++20210115100614+a14c36fe27f5/llvm/lib/CodeGen/AsmPrinter/AsmPrinter.cpp"
, 248, __PRETTY_FUNCTION__))
;
249 (void)DD->emitInitialLocDirective(MF, /*CUID=*/0);
250 }
251}
252
253/// getCurrentSection() - Return the current section we are emitting to.
254const MCSection *AsmPrinter::getCurrentSection() const {
255 return OutStreamer->getCurrentSectionOnly();
256}
257
258void AsmPrinter::getAnalysisUsage(AnalysisUsage &AU) const {
259 AU.setPreservesAll();
260 MachineFunctionPass::getAnalysisUsage(AU);
261 AU.addRequired<MachineOptimizationRemarkEmitterPass>();
262 AU.addRequired<GCModuleInfo>();
263}
264
265bool AsmPrinter::doInitialization(Module &M) {
266 auto *MMIWP = getAnalysisIfAvailable<MachineModuleInfoWrapperPass>();
267 MMI = MMIWP
0.1
'MMIWP' is null
? &MMIWP->getMMI() : nullptr
;
1
'?' condition is false
2
Null pointer value stored to field 'MMI'
268
269 // Initialize TargetLoweringObjectFile.
270 const_cast<TargetLoweringObjectFile&>(getObjFileLowering())
271 .Initialize(OutContext, TM);
272
273 const_cast<TargetLoweringObjectFile &>(getObjFileLowering())
274 .getModuleMetadata(M);
275
276 OutStreamer->InitSections(false);
277
278 if (DisableDebugInfoPrinting)
3
Assuming the condition is true
4
Taking true branch
279 MMI->setDebugInfoAvailability(false);
5
Called C++ object pointer is null
280
281 // Emit the version-min deployment target directive if needed.
282 //
283 // FIXME: If we end up with a collection of these sorts of Darwin-specific
284 // or ELF-specific things, it may make sense to have a platform helper class
285 // that will work with the target helper class. For now keep it here, as the
286 // alternative is duplicated code in each of the target asm printers that
287 // use the directive, where it would need the same conditionalization
288 // anyway.
289 const Triple &Target = TM.getTargetTriple();
290 OutStreamer->emitVersionForTarget(Target, M.getSDKVersion());
291
292 // Allow the target to emit any magic that it wants at the start of the file.
293 emitStartOfAsmFile(M);
294
295 // Very minimal debug info. It is ignored if we emit actual debug info. If we
296 // don't, this at least helps the user find where a global came from.
297 if (MAI->hasSingleParameterDotFile()) {
298 // .file "foo.c"
299 OutStreamer->emitFileDirective(
300 llvm::sys::path::filename(M.getSourceFileName()));
301 }
302
303 GCModuleInfo *MI = getAnalysisIfAvailable<GCModuleInfo>();
304 assert(MI && "AsmPrinter didn't require GCModuleInfo?")((MI && "AsmPrinter didn't require GCModuleInfo?") ? static_cast
<void> (0) : __assert_fail ("MI && \"AsmPrinter didn't require GCModuleInfo?\""
, "/build/llvm-toolchain-snapshot-12~++20210115100614+a14c36fe27f5/llvm/lib/CodeGen/AsmPrinter/AsmPrinter.cpp"
, 304, __PRETTY_FUNCTION__))
;
305 for (auto &I : *MI)
306 if (GCMetadataPrinter *MP = GetOrCreateGCPrinter(*I))
307 MP->beginAssembly(M, *MI, *this);
308
309 // Emit module-level inline asm if it exists.
310 if (!M.getModuleInlineAsm().empty()) {
311 // We're at the module level. Construct MCSubtarget from the default CPU
312 // and target triple.
313 std::unique_ptr<MCSubtargetInfo> STI(TM.getTarget().createMCSubtargetInfo(
314 TM.getTargetTriple().str(), TM.getTargetCPU(),
315 TM.getTargetFeatureString()));
316 assert(STI && "Unable to create subtarget info")((STI && "Unable to create subtarget info") ? static_cast
<void> (0) : __assert_fail ("STI && \"Unable to create subtarget info\""
, "/build/llvm-toolchain-snapshot-12~++20210115100614+a14c36fe27f5/llvm/lib/CodeGen/AsmPrinter/AsmPrinter.cpp"
, 316, __PRETTY_FUNCTION__))
;
317 OutStreamer->AddComment("Start of file scope inline assembly");
318 OutStreamer->AddBlankLine();
319 emitInlineAsm(M.getModuleInlineAsm() + "\n",
320 OutContext.getSubtargetCopy(*STI), TM.Options.MCOptions);
321 OutStreamer->AddComment("End of file scope inline assembly");
322 OutStreamer->AddBlankLine();
323 }
324
325 if (MAI->doesSupportDebugInformation()) {
326 bool EmitCodeView = M.getCodeViewFlag();
327 if (EmitCodeView && TM.getTargetTriple().isOSWindows()) {
328 Handlers.emplace_back(std::make_unique<CodeViewDebug>(this),
329 DbgTimerName, DbgTimerDescription,
330 CodeViewLineTablesGroupName,
331 CodeViewLineTablesGroupDescription);
332 }
333 if (!EmitCodeView || M.getDwarfVersion()) {
334 if (!DisableDebugInfoPrinting) {
335 DD = new DwarfDebug(this);
336 Handlers.emplace_back(std::unique_ptr<DwarfDebug>(DD), DbgTimerName,
337 DbgTimerDescription, DWARFGroupName,
338 DWARFGroupDescription);
339 }
340 }
341 }
342
343 if (M.getNamedMetadata(PseudoProbeDescMetadataName)) {
344 PP = new PseudoProbeHandler(this, &M);
345 Handlers.emplace_back(std::unique_ptr<PseudoProbeHandler>(PP), PPTimerName,
346 PPTimerDescription, PPGroupName, PPGroupDescription);
347 }
348
349 switch (MAI->getExceptionHandlingType()) {
350 case ExceptionHandling::SjLj:
351 case ExceptionHandling::DwarfCFI:
352 case ExceptionHandling::ARM:
353 isCFIMoveForDebugging = true;
354 if (MAI->getExceptionHandlingType() != ExceptionHandling::DwarfCFI)
355 break;
356 for (auto &F: M.getFunctionList()) {
357 // If the module contains any function with unwind data,
358 // .eh_frame has to be emitted.
359 // Ignore functions that won't get emitted.
360 if (!F.isDeclarationForLinker() && F.needsUnwindTableEntry()) {
361 isCFIMoveForDebugging = false;
362 break;
363 }
364 }
365 break;
366 default:
367 isCFIMoveForDebugging = false;
368 break;
369 }
370
371 EHStreamer *ES = nullptr;
372 switch (MAI->getExceptionHandlingType()) {
373 case ExceptionHandling::None:
374 break;
375 case ExceptionHandling::SjLj:
376 case ExceptionHandling::DwarfCFI:
377 ES = new DwarfCFIException(this);
378 break;
379 case ExceptionHandling::ARM:
380 ES = new ARMException(this);
381 break;
382 case ExceptionHandling::WinEH:
383 switch (MAI->getWinEHEncodingType()) {
384 default: llvm_unreachable("unsupported unwinding information encoding")::llvm::llvm_unreachable_internal("unsupported unwinding information encoding"
, "/build/llvm-toolchain-snapshot-12~++20210115100614+a14c36fe27f5/llvm/lib/CodeGen/AsmPrinter/AsmPrinter.cpp"
, 384)
;
385 case WinEH::EncodingType::Invalid:
386 break;
387 case WinEH::EncodingType::X86:
388 case WinEH::EncodingType::Itanium:
389 ES = new WinException(this);
390 break;
391 }
392 break;
393 case ExceptionHandling::Wasm:
394 ES = new WasmException(this);
395 break;
396 case ExceptionHandling::AIX:
397 ES = new AIXException(this);
398 break;
399 }
400 if (ES)
401 Handlers.emplace_back(std::unique_ptr<EHStreamer>(ES), EHTimerName,
402 EHTimerDescription, DWARFGroupName,
403 DWARFGroupDescription);
404
405 // Emit tables for any value of cfguard flag (i.e. cfguard=1 or cfguard=2).
406 if (mdconst::extract_or_null<ConstantInt>(M.getModuleFlag("cfguard")))
407 Handlers.emplace_back(std::make_unique<WinCFGuard>(this), CFGuardName,
408 CFGuardDescription, DWARFGroupName,
409 DWARFGroupDescription);
410
411 for (const HandlerInfo &HI : Handlers) {
412 NamedRegionTimer T(HI.TimerName, HI.TimerDescription, HI.TimerGroupName,
413 HI.TimerGroupDescription, TimePassesIsEnabled);
414 HI.Handler->beginModule(&M);
415 }
416
417 return false;
418}
419
420static bool canBeHidden(const GlobalValue *GV, const MCAsmInfo &MAI) {
421 if (!MAI.hasWeakDefCanBeHiddenDirective())
422 return false;
423
424 return GV->canBeOmittedFromSymbolTable();
425}
426
427void AsmPrinter::emitLinkage(const GlobalValue *GV, MCSymbol *GVSym) const {
428 GlobalValue::LinkageTypes Linkage = GV->getLinkage();
429 switch (Linkage) {
430 case GlobalValue::CommonLinkage:
431 case GlobalValue::LinkOnceAnyLinkage:
432 case GlobalValue::LinkOnceODRLinkage:
433 case GlobalValue::WeakAnyLinkage:
434 case GlobalValue::WeakODRLinkage:
435 if (MAI->hasWeakDefDirective()) {
436 // .globl _foo
437 OutStreamer->emitSymbolAttribute(GVSym, MCSA_Global);
438
439 if (!canBeHidden(GV, *MAI))
440 // .weak_definition _foo
441 OutStreamer->emitSymbolAttribute(GVSym, MCSA_WeakDefinition);
442 else
443 OutStreamer->emitSymbolAttribute(GVSym, MCSA_WeakDefAutoPrivate);
444 } else if (MAI->avoidWeakIfComdat() && GV->hasComdat()) {
445 // .globl _foo
446 OutStreamer->emitSymbolAttribute(GVSym, MCSA_Global);
447 //NOTE: linkonce is handled by the section the symbol was assigned to.
448 } else {
449 // .weak _foo
450 OutStreamer->emitSymbolAttribute(GVSym, MCSA_Weak);
451 }
452 return;
453 case GlobalValue::ExternalLinkage:
454 OutStreamer->emitSymbolAttribute(GVSym, MCSA_Global);
455 return;
456 case GlobalValue::PrivateLinkage:
457 case GlobalValue::InternalLinkage:
458 return;
459 case GlobalValue::ExternalWeakLinkage:
460 case GlobalValue::AvailableExternallyLinkage:
461 case GlobalValue::AppendingLinkage:
462 llvm_unreachable("Should never emit this")::llvm::llvm_unreachable_internal("Should never emit this", "/build/llvm-toolchain-snapshot-12~++20210115100614+a14c36fe27f5/llvm/lib/CodeGen/AsmPrinter/AsmPrinter.cpp"
, 462)
;
463 }
464 llvm_unreachable("Unknown linkage type!")::llvm::llvm_unreachable_internal("Unknown linkage type!", "/build/llvm-toolchain-snapshot-12~++20210115100614+a14c36fe27f5/llvm/lib/CodeGen/AsmPrinter/AsmPrinter.cpp"
, 464)
;
465}
466
467void AsmPrinter::getNameWithPrefix(SmallVectorImpl<char> &Name,
468 const GlobalValue *GV) const {
469 TM.getNameWithPrefix(Name, GV, getObjFileLowering().getMangler());
470}
471
472MCSymbol *AsmPrinter::getSymbol(const GlobalValue *GV) const {
473 return TM.getSymbol(GV);
474}
475
476MCSymbol *AsmPrinter::getSymbolPreferLocal(const GlobalValue &GV) const {
477 // On ELF, use .Lfoo$local if GV is a non-interposable GlobalObject with an
478 // exact definion (intersection of GlobalValue::hasExactDefinition() and
479 // !isInterposable()). These linkages include: external, appending, internal,
480 // private. It may be profitable to use a local alias for external. The
481 // assembler would otherwise be conservative and assume a global default
482 // visibility symbol can be interposable, even if the code generator already
483 // assumed it.
484 if (TM.getTargetTriple().isOSBinFormatELF() && GV.canBenefitFromLocalAlias()) {
485 const Module &M = *GV.getParent();
486 if (TM.getRelocationModel() != Reloc::Static &&
487 M.getPIELevel() == PIELevel::Default && GV.isDSOLocal())
488 return getSymbolWithGlobalValueBase(&GV, "$local");
489 }
490 return TM.getSymbol(&GV);
491}
492
493/// EmitGlobalVariable - Emit the specified global variable to the .s file.
494void AsmPrinter::emitGlobalVariable(const GlobalVariable *GV) {
495 bool IsEmuTLSVar = TM.useEmulatedTLS() && GV->isThreadLocal();
496 assert(!(IsEmuTLSVar && GV->hasCommonLinkage()) &&((!(IsEmuTLSVar && GV->hasCommonLinkage()) &&
"No emulated TLS variables in the common section") ? static_cast
<void> (0) : __assert_fail ("!(IsEmuTLSVar && GV->hasCommonLinkage()) && \"No emulated TLS variables in the common section\""
, "/build/llvm-toolchain-snapshot-12~++20210115100614+a14c36fe27f5/llvm/lib/CodeGen/AsmPrinter/AsmPrinter.cpp"
, 497, __PRETTY_FUNCTION__))
497 "No emulated TLS variables in the common section")((!(IsEmuTLSVar && GV->hasCommonLinkage()) &&
"No emulated TLS variables in the common section") ? static_cast
<void> (0) : __assert_fail ("!(IsEmuTLSVar && GV->hasCommonLinkage()) && \"No emulated TLS variables in the common section\""
, "/build/llvm-toolchain-snapshot-12~++20210115100614+a14c36fe27f5/llvm/lib/CodeGen/AsmPrinter/AsmPrinter.cpp"
, 497, __PRETTY_FUNCTION__))
;
498
499 // Never emit TLS variable xyz in emulated TLS model.
500 // The initialization value is in __emutls_t.xyz instead of xyz.
501 if (IsEmuTLSVar)
502 return;
503
504 if (GV->hasInitializer()) {
505 // Check to see if this is a special global used by LLVM, if so, emit it.
506 if (emitSpecialLLVMGlobal(GV))
507 return;
508
509 // Skip the emission of global equivalents. The symbol can be emitted later
510 // on by emitGlobalGOTEquivs in case it turns out to be needed.
511 if (GlobalGOTEquivs.count(getSymbol(GV)))
512 return;
513
514 if (isVerbose()) {
515 // When printing the control variable __emutls_v.*,
516 // we don't need to print the original TLS variable name.
517 GV->printAsOperand(OutStreamer->GetCommentOS(),
518 /*PrintType=*/false, GV->getParent());
519 OutStreamer->GetCommentOS() << '\n';
520 }
521 }
522
523 MCSymbol *GVSym = getSymbol(GV);
524 MCSymbol *EmittedSym = GVSym;
525
526 // getOrCreateEmuTLSControlSym only creates the symbol with name and default
527 // attributes.
528 // GV's or GVSym's attributes will be used for the EmittedSym.
529 emitVisibility(EmittedSym, GV->getVisibility(), !GV->isDeclaration());
530
531 if (!GV->hasInitializer()) // External globals require no extra code.
532 return;
533
534 GVSym->redefineIfPossible();
535 if (GVSym->isDefined() || GVSym->isVariable())
536 OutContext.reportError(SMLoc(), "symbol '" + Twine(GVSym->getName()) +
537 "' is already defined");
538
539 if (MAI->hasDotTypeDotSizeDirective())
540 OutStreamer->emitSymbolAttribute(EmittedSym, MCSA_ELF_TypeObject);
541
542 SectionKind GVKind = TargetLoweringObjectFile::getKindForGlobal(GV, TM);
543
544 const DataLayout &DL = GV->getParent()->getDataLayout();
545 uint64_t Size = DL.getTypeAllocSize(GV->getValueType());
546
547 // If the alignment is specified, we *must* obey it. Overaligning a global
548 // with a specified alignment is a prompt way to break globals emitted to
549 // sections and expected to be contiguous (e.g. ObjC metadata).
550 const Align Alignment = getGVAlignment(GV, DL);
551
552 for (const HandlerInfo &HI : Handlers) {
553 NamedRegionTimer T(HI.TimerName, HI.TimerDescription,
554 HI.TimerGroupName, HI.TimerGroupDescription,
555 TimePassesIsEnabled);
556 HI.Handler->setSymbolSize(GVSym, Size);
557 }
558
559 // Handle common symbols
560 if (GVKind.isCommon()) {
561 if (Size == 0) Size = 1; // .comm Foo, 0 is undefined, avoid it.
562 // .comm _foo, 42, 4
563 const bool SupportsAlignment =
564 getObjFileLowering().getCommDirectiveSupportsAlignment();
565 OutStreamer->emitCommonSymbol(GVSym, Size,
566 SupportsAlignment ? Alignment.value() : 0);
567 return;
568 }
569
570 // Determine to which section this global should be emitted.
571 MCSection *TheSection = getObjFileLowering().SectionForGlobal(GV, GVKind, TM);
572
573 // If we have a bss global going to a section that supports the
574 // zerofill directive, do so here.
575 if (GVKind.isBSS() && MAI->hasMachoZeroFillDirective() &&
576 TheSection->isVirtualSection()) {
577 if (Size == 0)
578 Size = 1; // zerofill of 0 bytes is undefined.
579 emitLinkage(GV, GVSym);
580 // .zerofill __DATA, __bss, _foo, 400, 5
581 OutStreamer->emitZerofill(TheSection, GVSym, Size, Alignment.value());
582 return;
583 }
584
585 // If this is a BSS local symbol and we are emitting in the BSS
586 // section use .lcomm/.comm directive.
587 if (GVKind.isBSSLocal() &&
588 getObjFileLowering().getBSSSection() == TheSection) {
589 if (Size == 0)
590 Size = 1; // .comm Foo, 0 is undefined, avoid it.
591
592 // Use .lcomm only if it supports user-specified alignment.
593 // Otherwise, while it would still be correct to use .lcomm in some
594 // cases (e.g. when Align == 1), the external assembler might enfore
595 // some -unknown- default alignment behavior, which could cause
596 // spurious differences between external and integrated assembler.
597 // Prefer to simply fall back to .local / .comm in this case.
598 if (MAI->getLCOMMDirectiveAlignmentType() != LCOMM::NoAlignment) {
599 // .lcomm _foo, 42
600 OutStreamer->emitLocalCommonSymbol(GVSym, Size, Alignment.value());
601 return;
602 }
603
604 // .local _foo
605 OutStreamer->emitSymbolAttribute(GVSym, MCSA_Local);
606 // .comm _foo, 42, 4
607 const bool SupportsAlignment =
608 getObjFileLowering().getCommDirectiveSupportsAlignment();
609 OutStreamer->emitCommonSymbol(GVSym, Size,
610 SupportsAlignment ? Alignment.value() : 0);
611 return;
612 }
613
614 // Handle thread local data for mach-o which requires us to output an
615 // additional structure of data and mangle the original symbol so that we
616 // can reference it later.
617 //
618 // TODO: This should become an "emit thread local global" method on TLOF.
619 // All of this macho specific stuff should be sunk down into TLOFMachO and
620 // stuff like "TLSExtraDataSection" should no longer be part of the parent
621 // TLOF class. This will also make it more obvious that stuff like
622 // MCStreamer::EmitTBSSSymbol is macho specific and only called from macho
623 // specific code.
624 if (GVKind.isThreadLocal() && MAI->hasMachoTBSSDirective()) {
625 // Emit the .tbss symbol
626 MCSymbol *MangSym =
627 OutContext.getOrCreateSymbol(GVSym->getName() + Twine("$tlv$init"));
628
629 if (GVKind.isThreadBSS()) {
630 TheSection = getObjFileLowering().getTLSBSSSection();
631 OutStreamer->emitTBSSSymbol(TheSection, MangSym, Size, Alignment.value());
632 } else if (GVKind.isThreadData()) {
633 OutStreamer->SwitchSection(TheSection);
634
635 emitAlignment(Alignment, GV);
636 OutStreamer->emitLabel(MangSym);
637
638 emitGlobalConstant(GV->getParent()->getDataLayout(),
639 GV->getInitializer());
640 }
641
642 OutStreamer->AddBlankLine();
643
644 // Emit the variable struct for the runtime.
645 MCSection *TLVSect = getObjFileLowering().getTLSExtraDataSection();
646
647 OutStreamer->SwitchSection(TLVSect);
648 // Emit the linkage here.
649 emitLinkage(GV, GVSym);
650 OutStreamer->emitLabel(GVSym);
651
652 // Three pointers in size:
653 // - __tlv_bootstrap - used to make sure support exists
654 // - spare pointer, used when mapped by the runtime
655 // - pointer to mangled symbol above with initializer
656 unsigned PtrSize = DL.getPointerTypeSize(GV->getType());
657 OutStreamer->emitSymbolValue(GetExternalSymbolSymbol("_tlv_bootstrap"),
658 PtrSize);
659 OutStreamer->emitIntValue(0, PtrSize);
660 OutStreamer->emitSymbolValue(MangSym, PtrSize);
661
662 OutStreamer->AddBlankLine();
663 return;
664 }
665
666 MCSymbol *EmittedInitSym = GVSym;
667
668 OutStreamer->SwitchSection(TheSection);
669
670 emitLinkage(GV, EmittedInitSym);
671 emitAlignment(Alignment, GV);
672
673 OutStreamer->emitLabel(EmittedInitSym);
674 MCSymbol *LocalAlias = getSymbolPreferLocal(*GV);
675 if (LocalAlias != EmittedInitSym)
676 OutStreamer->emitLabel(LocalAlias);
677
678 emitGlobalConstant(GV->getParent()->getDataLayout(), GV->getInitializer());
679
680 if (MAI->hasDotTypeDotSizeDirective())
681 // .size foo, 42
682 OutStreamer->emitELFSize(EmittedInitSym,
683 MCConstantExpr::create(Size, OutContext));
684
685 OutStreamer->AddBlankLine();
686}
687
688/// Emit the directive and value for debug thread local expression
689///
690/// \p Value - The value to emit.
691/// \p Size - The size of the integer (in bytes) to emit.
692void AsmPrinter::emitDebugValue(const MCExpr *Value, unsigned Size) const {
693 OutStreamer->emitValue(Value, Size);
694}
695
696void AsmPrinter::emitFunctionHeaderComment() {}
697
698/// EmitFunctionHeader - This method emits the header for the current
699/// function.
700void AsmPrinter::emitFunctionHeader() {
701 const Function &F = MF->getFunction();
702
703 if (isVerbose())
704 OutStreamer->GetCommentOS()
705 << "-- Begin function "
706 << GlobalValue::dropLLVMManglingEscape(F.getName()) << '\n';
707
708 // Print out constants referenced by the function
709 emitConstantPool();
710
711 // Print the 'header' of function.
712 MF->setSection(getObjFileLowering().SectionForGlobal(&F, TM));
713 OutStreamer->SwitchSection(MF->getSection());
714
715 if (!MAI->hasVisibilityOnlyWithLinkage())
716 emitVisibility(CurrentFnSym, F.getVisibility());
717
718 if (MAI->needsFunctionDescriptors())
719 emitLinkage(&F, CurrentFnDescSym);
720
721 emitLinkage(&F, CurrentFnSym);
722 if (MAI->hasFunctionAlignment())
723 emitAlignment(MF->getAlignment(), &F);
724
725 if (MAI->hasDotTypeDotSizeDirective())
726 OutStreamer->emitSymbolAttribute(CurrentFnSym, MCSA_ELF_TypeFunction);
727
728 if (F.hasFnAttribute(Attribute::Cold))
729 OutStreamer->emitSymbolAttribute(CurrentFnSym, MCSA_Cold);
730
731 if (isVerbose()) {
732 F.printAsOperand(OutStreamer->GetCommentOS(),
733 /*PrintType=*/false, F.getParent());
734 emitFunctionHeaderComment();
735 OutStreamer->GetCommentOS() << '\n';
736 }
737
738 // Emit the prefix data.
739 if (F.hasPrefixData()) {
740 if (MAI->hasSubsectionsViaSymbols()) {
741 // Preserving prefix data on platforms which use subsections-via-symbols
742 // is a bit tricky. Here we introduce a symbol for the prefix data
743 // and use the .alt_entry attribute to mark the function's real entry point
744 // as an alternative entry point to the prefix-data symbol.
745 MCSymbol *PrefixSym = OutContext.createLinkerPrivateTempSymbol();
746 OutStreamer->emitLabel(PrefixSym);
747
748 emitGlobalConstant(F.getParent()->getDataLayout(), F.getPrefixData());
749
750 // Emit an .alt_entry directive for the actual function symbol.
751 OutStreamer->emitSymbolAttribute(CurrentFnSym, MCSA_AltEntry);
752 } else {
753 emitGlobalConstant(F.getParent()->getDataLayout(), F.getPrefixData());
754 }
755 }
756
757 // Emit M NOPs for -fpatchable-function-entry=N,M where M>0. We arbitrarily
758 // place prefix data before NOPs.
759 unsigned PatchableFunctionPrefix = 0;
760 unsigned PatchableFunctionEntry = 0;
761 (void)F.getFnAttribute("patchable-function-prefix")
762 .getValueAsString()
763 .getAsInteger(10, PatchableFunctionPrefix);
764 (void)F.getFnAttribute("patchable-function-entry")
765 .getValueAsString()
766 .getAsInteger(10, PatchableFunctionEntry);
767 if (PatchableFunctionPrefix) {
768 CurrentPatchableFunctionEntrySym =
769 OutContext.createLinkerPrivateTempSymbol();
770 OutStreamer->emitLabel(CurrentPatchableFunctionEntrySym);
771 emitNops(PatchableFunctionPrefix);
772 } else if (PatchableFunctionEntry) {
773 // May be reassigned when emitting the body, to reference the label after
774 // the initial BTI (AArch64) or endbr32/endbr64 (x86).
775 CurrentPatchableFunctionEntrySym = CurrentFnBegin;
776 }
777
778 // Emit the function descriptor. This is a virtual function to allow targets
779 // to emit their specific function descriptor. Right now it is only used by
780 // the AIX target. The PowerPC 64-bit V1 ELF target also uses function
781 // descriptors and should be converted to use this hook as well.
782 if (MAI->needsFunctionDescriptors())
783 emitFunctionDescriptor();
784
785 // Emit the CurrentFnSym. This is a virtual function to allow targets to do
786 // their wild and crazy things as required.
787 emitFunctionEntryLabel();
788
789 if (CurrentFnBegin) {
790 if (MAI->useAssignmentForEHBegin()) {
791 MCSymbol *CurPos = OutContext.createTempSymbol();
792 OutStreamer->emitLabel(CurPos);
793 OutStreamer->emitAssignment(CurrentFnBegin,
794 MCSymbolRefExpr::create(CurPos, OutContext));
795 } else {
796 OutStreamer->emitLabel(CurrentFnBegin);
797 }
798 }
799
800 // Emit pre-function debug and/or EH information.
801 for (const HandlerInfo &HI : Handlers) {
802 NamedRegionTimer T(HI.TimerName, HI.TimerDescription, HI.TimerGroupName,
803 HI.TimerGroupDescription, TimePassesIsEnabled);
804 HI.Handler->beginFunction(MF);
805 }
806
807 // Emit the prologue data.
808 if (F.hasPrologueData())
809 emitGlobalConstant(F.getParent()->getDataLayout(), F.getPrologueData());
810}
811
812/// EmitFunctionEntryLabel - Emit the label that is the entrypoint for the
813/// function. This can be overridden by targets as required to do custom stuff.
814void AsmPrinter::emitFunctionEntryLabel() {
815 CurrentFnSym->redefineIfPossible();
816
817 // The function label could have already been emitted if two symbols end up
818 // conflicting due to asm renaming. Detect this and emit an error.
819 if (CurrentFnSym->isVariable())
820 report_fatal_error("'" + Twine(CurrentFnSym->getName()) +
821 "' is a protected alias");
822 if (CurrentFnSym->isDefined())
823 report_fatal_error("'" + Twine(CurrentFnSym->getName()) +
824 "' label emitted multiple times to assembly file");
825
826 OutStreamer->emitLabel(CurrentFnSym);
827
828 if (TM.getTargetTriple().isOSBinFormatELF()) {
829 MCSymbol *Sym = getSymbolPreferLocal(MF->getFunction());
830 if (Sym != CurrentFnSym)
831 OutStreamer->emitLabel(Sym);
832 }
833}
834
835/// emitComments - Pretty-print comments for instructions.
836static void emitComments(const MachineInstr &MI, raw_ostream &CommentOS) {
837 const MachineFunction *MF = MI.getMF();
838 const TargetInstrInfo *TII = MF->getSubtarget().getInstrInfo();
839
840 // Check for spills and reloads
841
842 // We assume a single instruction only has a spill or reload, not
843 // both.
844 Optional<unsigned> Size;
845 if ((Size = MI.getRestoreSize(TII))) {
846 CommentOS << *Size << "-byte Reload\n";
847 } else if ((Size = MI.getFoldedRestoreSize(TII))) {
848 if (*Size) {
849 if (*Size == unsigned(MemoryLocation::UnknownSize))
850 CommentOS << "Unknown-size Folded Reload\n";
851 else
852 CommentOS << *Size << "-byte Folded Reload\n";
853 }
854 } else if ((Size = MI.getSpillSize(TII))) {
855 CommentOS << *Size << "-byte Spill\n";
856 } else if ((Size = MI.getFoldedSpillSize(TII))) {
857 if (*Size) {
858 if (*Size == unsigned(MemoryLocation::UnknownSize))
859 CommentOS << "Unknown-size Folded Spill\n";
860 else
861 CommentOS << *Size << "-byte Folded Spill\n";
862 }
863 }
864
865 // Check for spill-induced copies
866 if (MI.getAsmPrinterFlag(MachineInstr::ReloadReuse))
867 CommentOS << " Reload Reuse\n";
868}
869
870/// emitImplicitDef - This method emits the specified machine instruction
871/// that is an implicit def.
872void AsmPrinter::emitImplicitDef(const MachineInstr *MI) const {
873 Register RegNo = MI->getOperand(0).getReg();
874
875 SmallString<128> Str;
876 raw_svector_ostream OS(Str);
877 OS << "implicit-def: "
878 << printReg(RegNo, MF->getSubtarget().getRegisterInfo());
879
880 OutStreamer->AddComment(OS.str());
881 OutStreamer->AddBlankLine();
882}
883
884static void emitKill(const MachineInstr *MI, AsmPrinter &AP) {
885 std::string Str;
886 raw_string_ostream OS(Str);
887 OS << "kill:";
888 for (unsigned i = 0, e = MI->getNumOperands(); i != e; ++i) {
889 const MachineOperand &Op = MI->getOperand(i);
890 assert(Op.isReg() && "KILL instruction must have only register operands")((Op.isReg() && "KILL instruction must have only register operands"
) ? static_cast<void> (0) : __assert_fail ("Op.isReg() && \"KILL instruction must have only register operands\""
, "/build/llvm-toolchain-snapshot-12~++20210115100614+a14c36fe27f5/llvm/lib/CodeGen/AsmPrinter/AsmPrinter.cpp"
, 890, __PRETTY_FUNCTION__))
;
891 OS << ' ' << (Op.isDef() ? "def " : "killed ")
892 << printReg(Op.getReg(), AP.MF->getSubtarget().getRegisterInfo());
893 }
894 AP.OutStreamer->AddComment(OS.str());
895 AP.OutStreamer->AddBlankLine();
896}
897
898/// emitDebugValueComment - This method handles the target-independent form
899/// of DBG_VALUE, returning true if it was able to do so. A false return
900/// means the target will need to handle MI in EmitInstruction.
901static bool emitDebugValueComment(const MachineInstr *MI, AsmPrinter &AP) {
902 // This code handles only the 4-operand target-independent form.
903 if (MI->getNumOperands() != 4)
904 return false;
905
906 SmallString<128> Str;
907 raw_svector_ostream OS(Str);
908 OS << "DEBUG_VALUE: ";
909
910 const DILocalVariable *V = MI->getDebugVariable();
911 if (auto *SP = dyn_cast<DISubprogram>(V->getScope())) {
912 StringRef Name = SP->getName();
913 if (!Name.empty())
914 OS << Name << ":";
915 }
916 OS << V->getName();
917 OS << " <- ";
918
919 // The second operand is only an offset if it's an immediate.
920 bool MemLoc = MI->isIndirectDebugValue();
921 auto Offset = StackOffset::getFixed(MemLoc ? MI->getOperand(1).getImm() : 0);
922 const DIExpression *Expr = MI->getDebugExpression();
923 if (Expr->getNumElements()) {
924 OS << '[';
925 bool NeedSep = false;
926 for (auto Op : Expr->expr_ops()) {
927 if (NeedSep)
928 OS << ", ";
929 else
930 NeedSep = true;
931 OS << dwarf::OperationEncodingString(Op.getOp());
932 for (unsigned I = 0; I < Op.getNumArgs(); ++I)
933 OS << ' ' << Op.getArg(I);
934 }
935 OS << "] ";
936 }
937
938 // Register or immediate value. Register 0 means undef.
939 if (MI->getDebugOperand(0).isFPImm()) {
940 APFloat APF = APFloat(MI->getDebugOperand(0).getFPImm()->getValueAPF());
941 if (MI->getDebugOperand(0).getFPImm()->getType()->isFloatTy()) {
942 OS << (double)APF.convertToFloat();
943 } else if (MI->getDebugOperand(0).getFPImm()->getType()->isDoubleTy()) {
944 OS << APF.convertToDouble();
945 } else {
946 // There is no good way to print long double. Convert a copy to
947 // double. Ah well, it's only a comment.
948 bool ignored;
949 APF.convert(APFloat::IEEEdouble(), APFloat::rmNearestTiesToEven,
950 &ignored);
951 OS << "(long double) " << APF.convertToDouble();
952 }
953 } else if (MI->getDebugOperand(0).isImm()) {
954 OS << MI->getDebugOperand(0).getImm();
955 } else if (MI->getDebugOperand(0).isCImm()) {
956 MI->getDebugOperand(0).getCImm()->getValue().print(OS, false /*isSigned*/);
957 } else if (MI->getDebugOperand(0).isTargetIndex()) {
958 auto Op = MI->getDebugOperand(0);
959 OS << "!target-index(" << Op.getIndex() << "," << Op.getOffset() << ")";
960 // NOTE: Want this comment at start of line, don't emit with AddComment.
961 AP.OutStreamer->emitRawComment(OS.str());
962 return true;
963 } else {
964 Register Reg;
965 if (MI->getDebugOperand(0).isReg()) {
966 Reg = MI->getDebugOperand(0).getReg();
967 } else {
968 assert(MI->getDebugOperand(0).isFI() && "Unknown operand type")((MI->getDebugOperand(0).isFI() && "Unknown operand type"
) ? static_cast<void> (0) : __assert_fail ("MI->getDebugOperand(0).isFI() && \"Unknown operand type\""
, "/build/llvm-toolchain-snapshot-12~++20210115100614+a14c36fe27f5/llvm/lib/CodeGen/AsmPrinter/AsmPrinter.cpp"
, 968, __PRETTY_FUNCTION__))
;
969 const TargetFrameLowering *TFI = AP.MF->getSubtarget().getFrameLowering();
970 Offset += TFI->getFrameIndexReference(
971 *AP.MF, MI->getDebugOperand(0).getIndex(), Reg);
972 MemLoc = true;
973 }
974 if (Reg == 0) {
975 // Suppress offset, it is not meaningful here.
976 OS << "undef";
977 // NOTE: Want this comment at start of line, don't emit with AddComment.
978 AP.OutStreamer->emitRawComment(OS.str());
979 return true;
980 }
981 if (MemLoc)
982 OS << '[';
983 OS << printReg(Reg, AP.MF->getSubtarget().getRegisterInfo());
984 }
985
986 if (MemLoc)
987 OS << '+' << Offset.getFixed() << ']';
988
989 // NOTE: Want this comment at start of line, don't emit with AddComment.
990 AP.OutStreamer->emitRawComment(OS.str());
991 return true;
992}
993
994/// This method handles the target-independent form of DBG_LABEL, returning
995/// true if it was able to do so. A false return means the target will need
996/// to handle MI in EmitInstruction.
997static bool emitDebugLabelComment(const MachineInstr *MI, AsmPrinter &AP) {
998 if (MI->getNumOperands() != 1)
999 return false;
1000
1001 SmallString<128> Str;
1002 raw_svector_ostream OS(Str);
1003 OS << "DEBUG_LABEL: ";
1004
1005 const DILabel *V = MI->getDebugLabel();
1006 if (auto *SP = dyn_cast<DISubprogram>(
1007 V->getScope()->getNonLexicalBlockFileScope())) {
1008 StringRef Name = SP->getName();
1009 if (!Name.empty())
1010 OS << Name << ":";
1011 }
1012 OS << V->getName();
1013
1014 // NOTE: Want this comment at start of line, don't emit with AddComment.
1015 AP.OutStreamer->emitRawComment(OS.str());
1016 return true;
1017}
1018
1019AsmPrinter::CFIMoveType AsmPrinter::needsCFIMoves() const {
1020 if (MAI->getExceptionHandlingType() == ExceptionHandling::DwarfCFI &&
1021 MF->getFunction().needsUnwindTableEntry())
1022 return CFI_M_EH;
1023
1024 if (MMI->hasDebugInfo() || MF->getTarget().Options.ForceDwarfFrameSection)
1025 return CFI_M_Debug;
1026
1027 return CFI_M_None;
1028}
1029
1030bool AsmPrinter::needsSEHMoves() {
1031 return MAI->usesWindowsCFI() && MF->getFunction().needsUnwindTableEntry();
1032}
1033
1034void AsmPrinter::emitCFIInstruction(const MachineInstr &MI) {
1035 ExceptionHandling ExceptionHandlingType = MAI->getExceptionHandlingType();
1036 if (ExceptionHandlingType != ExceptionHandling::DwarfCFI &&
1037 ExceptionHandlingType != ExceptionHandling::ARM)
1038 return;
1039
1040 if (needsCFIMoves() == CFI_M_None)
1041 return;
1042
1043 // If there is no "real" instruction following this CFI instruction, skip
1044 // emitting it; it would be beyond the end of the function's FDE range.
1045 auto *MBB = MI.getParent();
1046 auto I = std::next(MI.getIterator());
1047 while (I != MBB->end() && I->isTransient())
1048 ++I;
1049 if (I == MBB->instr_end() &&
1050 MBB->getReverseIterator() == MBB->getParent()->rbegin())
1051 return;
1052
1053 const std::vector<MCCFIInstruction> &Instrs = MF->getFrameInstructions();
1054 unsigned CFIIndex = MI.getOperand(0).getCFIIndex();
1055 const MCCFIInstruction &CFI = Instrs[CFIIndex];
1056 emitCFIInstruction(CFI);
1057}
1058
1059void AsmPrinter::emitFrameAlloc(const MachineInstr &MI) {
1060 // The operands are the MCSymbol and the frame offset of the allocation.
1061 MCSymbol *FrameAllocSym = MI.getOperand(0).getMCSymbol();
1062 int FrameOffset = MI.getOperand(1).getImm();
1063
1064 // Emit a symbol assignment.
1065 OutStreamer->emitAssignment(FrameAllocSym,
1066 MCConstantExpr::create(FrameOffset, OutContext));
1067}
1068
1069/// Returns the BB metadata to be emitted in the .llvm_bb_addr_map section for a
1070/// given basic block. This can be used to capture more precise profile
1071/// information. We use the last 3 bits (LSBs) to ecnode the following
1072/// information:
1073/// * (1): set if return block (ret or tail call).
1074/// * (2): set if ends with a tail call.
1075/// * (3): set if exception handling (EH) landing pad.
1076/// The remaining bits are zero.
1077static unsigned getBBAddrMapMetadata(const MachineBasicBlock &MBB) {
1078 const TargetInstrInfo *TII = MBB.getParent()->getSubtarget().getInstrInfo();
1079 return ((unsigned)MBB.isReturnBlock()) |
1080 ((!MBB.empty() && TII->isTailCall(MBB.back())) << 1) |
1081 (MBB.isEHPad() << 2);
1082}
1083
1084void AsmPrinter::emitBBAddrMapSection(const MachineFunction &MF) {
1085 MCSection *BBAddrMapSection =
1086 getObjFileLowering().getBBAddrMapSection(*MF.getSection());
1087 assert(BBAddrMapSection && ".llvm_bb_addr_map section is not initialized.")((BBAddrMapSection && ".llvm_bb_addr_map section is not initialized."
) ? static_cast<void> (0) : __assert_fail ("BBAddrMapSection && \".llvm_bb_addr_map section is not initialized.\""
, "/build/llvm-toolchain-snapshot-12~++20210115100614+a14c36fe27f5/llvm/lib/CodeGen/AsmPrinter/AsmPrinter.cpp"
, 1087, __PRETTY_FUNCTION__))
;
1088
1089 const MCSymbol *FunctionSymbol = getFunctionBegin();
1090
1091 OutStreamer->PushSection();
1092 OutStreamer->SwitchSection(BBAddrMapSection);
1093 OutStreamer->emitSymbolValue(FunctionSymbol, getPointerSize());
1094 // Emit the total number of basic blocks in this function.
1095 OutStreamer->emitULEB128IntValue(MF.size());
1096 // Emit BB Information for each basic block in the funciton.
1097 for (const MachineBasicBlock &MBB : MF) {
1098 const MCSymbol *MBBSymbol =
1099 MBB.isEntryBlock() ? FunctionSymbol : MBB.getSymbol();
1100 // Emit the basic block offset.
1101 emitLabelDifferenceAsULEB128(MBBSymbol, FunctionSymbol);
1102 // Emit the basic block size. When BBs have alignments, their size cannot
1103 // always be computed from their offsets.
1104 emitLabelDifferenceAsULEB128(MBB.getEndSymbol(), MBBSymbol);
1105 OutStreamer->emitULEB128IntValue(getBBAddrMapMetadata(MBB));
1106 }
1107 OutStreamer->PopSection();
1108}
1109
1110void AsmPrinter::emitPseudoProbe(const MachineInstr &MI) {
1111 auto GUID = MI.getOperand(0).getImm();
1112 auto Index = MI.getOperand(1).getImm();
1113 auto Type = MI.getOperand(2).getImm();
1114 auto Attr = MI.getOperand(3).getImm();
1115 DILocation *DebugLoc = MI.getDebugLoc();
1116 PP->emitPseudoProbe(GUID, Index, Type, Attr, DebugLoc);
1117}
1118
1119void AsmPrinter::emitStackSizeSection(const MachineFunction &MF) {
1120 if (!MF.getTarget().Options.EmitStackSizeSection)
1121 return;
1122
1123 MCSection *StackSizeSection =
1124 getObjFileLowering().getStackSizesSection(*getCurrentSection());
1125 if (!StackSizeSection)
1126 return;
1127
1128 const MachineFrameInfo &FrameInfo = MF.getFrameInfo();
1129 // Don't emit functions with dynamic stack allocations.
1130 if (FrameInfo.hasVarSizedObjects())
1131 return;
1132
1133 OutStreamer->PushSection();
1134 OutStreamer->SwitchSection(StackSizeSection);
1135
1136 const MCSymbol *FunctionSymbol = getFunctionBegin();
1137 uint64_t StackSize = FrameInfo.getStackSize();
1138 OutStreamer->emitSymbolValue(FunctionSymbol, TM.getProgramPointerSize());
1139 OutStreamer->emitULEB128IntValue(StackSize);
1140
1141 OutStreamer->PopSection();
1142}
1143
1144static bool needFuncLabelsForEHOrDebugInfo(const MachineFunction &MF) {
1145 MachineModuleInfo &MMI = MF.getMMI();
1146 if (!MF.getLandingPads().empty() || MF.hasEHFunclets() || MMI.hasDebugInfo())
1147 return true;
1148
1149 // We might emit an EH table that uses function begin and end labels even if
1150 // we don't have any landingpads.
1151 if (!MF.getFunction().hasPersonalityFn())
1152 return false;
1153 return !isNoOpWithoutInvoke(
1154 classifyEHPersonality(MF.getFunction().getPersonalityFn()));
1155}
1156
1157/// EmitFunctionBody - This method emits the body and trailer for a
1158/// function.
1159void AsmPrinter::emitFunctionBody() {
1160 emitFunctionHeader();
1161
1162 // Emit target-specific gunk before the function body.
1163 emitFunctionBodyStart();
1164
1165 if (isVerbose()) {
1166 // Get MachineDominatorTree or compute it on the fly if it's unavailable
1167 MDT = getAnalysisIfAvailable<MachineDominatorTree>();
1168 if (!MDT) {
1169 OwnedMDT = std::make_unique<MachineDominatorTree>();
1170 OwnedMDT->getBase().recalculate(*MF);
1171 MDT = OwnedMDT.get();
1172 }
1173
1174 // Get MachineLoopInfo or compute it on the fly if it's unavailable
1175 MLI = getAnalysisIfAvailable<MachineLoopInfo>();
1176 if (!MLI) {
1177 OwnedMLI = std::make_unique<MachineLoopInfo>();
1178 OwnedMLI->getBase().analyze(MDT->getBase());
1179 MLI = OwnedMLI.get();
1180 }
1181 }
1182
1183 // Print out code for the function.
1184 bool HasAnyRealCode = false;
1185 int NumInstsInFunction = 0;
1186
1187 bool CanDoExtraAnalysis = ORE->allowExtraAnalysis(DEBUG_TYPE"asm-printer");
1188 for (auto &MBB : *MF) {
1189 // Print a label for the basic block.
1190 emitBasicBlockStart(MBB);
1191 DenseMap<StringRef, unsigned> MnemonicCounts;
1192 for (auto &MI : MBB) {
1193 // Print the assembly for the instruction.
1194 if (!MI.isPosition() && !MI.isImplicitDef() && !MI.isKill() &&
1195 !MI.isDebugInstr()) {
1196 HasAnyRealCode = true;
1197 ++NumInstsInFunction;
1198 }
1199
1200 // If there is a pre-instruction symbol, emit a label for it here.
1201 if (MCSymbol *S = MI.getPreInstrSymbol())
1202 OutStreamer->emitLabel(S);
1203
1204 for (const HandlerInfo &HI : Handlers) {
1205 NamedRegionTimer T(HI.TimerName, HI.TimerDescription, HI.TimerGroupName,
1206 HI.TimerGroupDescription, TimePassesIsEnabled);
1207 HI.Handler->beginInstruction(&MI);
1208 }
1209
1210 if (isVerbose())
1211 emitComments(MI, OutStreamer->GetCommentOS());
1212
1213 switch (MI.getOpcode()) {
1214 case TargetOpcode::CFI_INSTRUCTION:
1215 emitCFIInstruction(MI);
1216 break;
1217 case TargetOpcode::LOCAL_ESCAPE:
1218 emitFrameAlloc(MI);
1219 break;
1220 case TargetOpcode::ANNOTATION_LABEL:
1221 case TargetOpcode::EH_LABEL:
1222 case TargetOpcode::GC_LABEL:
1223 OutStreamer->emitLabel(MI.getOperand(0).getMCSymbol());
1224 break;
1225 case TargetOpcode::INLINEASM:
1226 case TargetOpcode::INLINEASM_BR:
1227 emitInlineAsm(&MI);
1228 break;
1229 case TargetOpcode::DBG_VALUE:
1230 if (isVerbose()) {
1231 if (!emitDebugValueComment(&MI, *this))
1232 emitInstruction(&MI);
1233 }
1234 break;
1235 case TargetOpcode::DBG_INSTR_REF:
1236 // This instruction reference will have been resolved to a machine
1237 // location, and a nearby DBG_VALUE created. We can safely ignore
1238 // the instruction reference.
1239 break;
1240 case TargetOpcode::DBG_LABEL:
1241 if (isVerbose()) {
1242 if (!emitDebugLabelComment(&MI, *this))
1243 emitInstruction(&MI);
1244 }
1245 break;
1246 case TargetOpcode::IMPLICIT_DEF:
1247 if (isVerbose()) emitImplicitDef(&MI);
1248 break;
1249 case TargetOpcode::KILL:
1250 if (isVerbose()) emitKill(&MI, *this);
1251 break;
1252 case TargetOpcode::PSEUDO_PROBE:
1253 emitPseudoProbe(MI);
1254 break;
1255 default:
1256 emitInstruction(&MI);
1257 if (CanDoExtraAnalysis) {
1258 MCInst MCI;
1259 MCI.setOpcode(MI.getOpcode());
1260 auto Name = OutStreamer->getMnemonic(MCI);
1261 auto I = MnemonicCounts.insert({Name, 0u});
1262 I.first->second++;
1263 }
1264 break;
1265 }
1266
1267 // If there is a post-instruction symbol, emit a label for it here.
1268 if (MCSymbol *S = MI.getPostInstrSymbol())
1269 OutStreamer->emitLabel(S);
1270
1271 for (const HandlerInfo &HI : Handlers) {
1272 NamedRegionTimer T(HI.TimerName, HI.TimerDescription, HI.TimerGroupName,
1273 HI.TimerGroupDescription, TimePassesIsEnabled);
1274 HI.Handler->endInstruction();
1275 }
1276 }
1277
1278 // We must emit temporary symbol for the end of this basic block, if either
1279 // we have BBLabels enabled or if this basic blocks marks the end of a
1280 // section (except the section containing the entry basic block as the end
1281 // symbol for that section is CurrentFnEnd).
1282 if (MF->hasBBLabels() ||
1283 (MAI->hasDotTypeDotSizeDirective() && MBB.isEndSection() &&
1284 !MBB.sameSection(&MF->front())))
1285 OutStreamer->emitLabel(MBB.getEndSymbol());
1286
1287 if (MBB.isEndSection()) {
1288 // The size directive for the section containing the entry block is
1289 // handled separately by the function section.
1290 if (!MBB.sameSection(&MF->front())) {
1291 if (MAI->hasDotTypeDotSizeDirective()) {
1292 // Emit the size directive for the basic block section.
1293 const MCExpr *SizeExp = MCBinaryExpr::createSub(
1294 MCSymbolRefExpr::create(MBB.getEndSymbol(), OutContext),
1295 MCSymbolRefExpr::create(CurrentSectionBeginSym, OutContext),
1296 OutContext);
1297 OutStreamer->emitELFSize(CurrentSectionBeginSym, SizeExp);
1298 }
1299 MBBSectionRanges[MBB.getSectionIDNum()] =
1300 MBBSectionRange{CurrentSectionBeginSym, MBB.getEndSymbol()};
1301 }
1302 }
1303 emitBasicBlockEnd(MBB);
1304
1305 if (CanDoExtraAnalysis) {
1306 // Skip empty blocks.
1307 if (MBB.empty())
1308 continue;
1309
1310 MachineOptimizationRemarkAnalysis R(DEBUG_TYPE"asm-printer", "InstructionMix",
1311 MBB.begin()->getDebugLoc(), &MBB);
1312
1313 // Generate instruction mix remark. First, sort counts in descending order
1314 // by count and name.
1315 SmallVector<std::pair<StringRef, unsigned>, 128> MnemonicVec;
1316 for (auto &KV : MnemonicCounts)
1317 MnemonicVec.emplace_back(KV.first, KV.second);
1318
1319 sort(MnemonicVec, [](const std::pair<StringRef, unsigned> &A,
1320 const std::pair<StringRef, unsigned> &B) {
1321 if (A.second > B.second)
1322 return true;
1323 if (A.second == B.second)
1324 return StringRef(A.first) < StringRef(B.first);
1325 return false;
1326 });
1327 R << "BasicBlock: " << ore::NV("BasicBlock", MBB.getName()) << "\n";
1328 for (auto &KV : MnemonicVec) {
1329 auto Name = (Twine("INST_") + KV.first.trim()).str();
1330 R << KV.first << ": " << ore::NV(Name, KV.second) << "\n";
1331 }
1332 ORE->emit(R);
1333 }
1334 }
1335
1336 EmittedInsts += NumInstsInFunction;
1337 MachineOptimizationRemarkAnalysis R(DEBUG_TYPE"asm-printer", "InstructionCount",
1338 MF->getFunction().getSubprogram(),
1339 &MF->front());
1340 R << ore::NV("NumInstructions", NumInstsInFunction)
1341 << " instructions in function";
1342 ORE->emit(R);
1343
1344 // If the function is empty and the object file uses .subsections_via_symbols,
1345 // then we need to emit *something* to the function body to prevent the
1346 // labels from collapsing together. Just emit a noop.
1347 // Similarly, don't emit empty functions on Windows either. It can lead to
1348 // duplicate entries (two functions with the same RVA) in the Guard CF Table
1349 // after linking, causing the kernel not to load the binary:
1350 // https://developercommunity.visualstudio.com/content/problem/45366/vc-linker-creates-invalid-dll-with-clang-cl.html
1351 // FIXME: Hide this behind some API in e.g. MCAsmInfo or MCTargetStreamer.
1352 const Triple &TT = TM.getTargetTriple();
1353 if (!HasAnyRealCode && (MAI->hasSubsectionsViaSymbols() ||
1354 (TT.isOSWindows() && TT.isOSBinFormatCOFF()))) {
1355 MCInst Noop;
1356 MF->getSubtarget().getInstrInfo()->getNoop(Noop);
1357
1358 // Targets can opt-out of emitting the noop here by leaving the opcode
1359 // unspecified.
1360 if (Noop.getOpcode()) {
1361 OutStreamer->AddComment("avoids zero-length function");
1362 emitNops(1);
1363 }
1364 }
1365
1366 // Switch to the original section in case basic block sections was used.
1367 OutStreamer->SwitchSection(MF->getSection());
1368
1369 const Function &F = MF->getFunction();
1370 for (const auto &BB : F) {
1371 if (!BB.hasAddressTaken())
1372 continue;
1373 MCSymbol *Sym = GetBlockAddressSymbol(&BB);
1374 if (Sym->isDefined())
1375 continue;
1376 OutStreamer->AddComment("Address of block that was removed by CodeGen");
1377 OutStreamer->emitLabel(Sym);
1378 }
1379
1380 // Emit target-specific gunk after the function body.
1381 emitFunctionBodyEnd();
1382
1383 if (needFuncLabelsForEHOrDebugInfo(*MF) ||
1384 MAI->hasDotTypeDotSizeDirective()) {
1385 // Create a symbol for the end of function.
1386 CurrentFnEnd = createTempSymbol("func_end");
1387 OutStreamer->emitLabel(CurrentFnEnd);
1388 }
1389
1390 // If the target wants a .size directive for the size of the function, emit
1391 // it.
1392 if (MAI->hasDotTypeDotSizeDirective()) {
1393 // We can get the size as difference between the function label and the
1394 // temp label.
1395 const MCExpr *SizeExp = MCBinaryExpr::createSub(
1396 MCSymbolRefExpr::create(CurrentFnEnd, OutContext),
1397 MCSymbolRefExpr::create(CurrentFnSymForSize, OutContext), OutContext);
1398 OutStreamer->emitELFSize(CurrentFnSym, SizeExp);
1399 }
1400
1401 for (const HandlerInfo &HI : Handlers) {
1402 NamedRegionTimer T(HI.TimerName, HI.TimerDescription, HI.TimerGroupName,
1403 HI.TimerGroupDescription, TimePassesIsEnabled);
1404 HI.Handler->markFunctionEnd();
1405 }
1406
1407 MBBSectionRanges[MF->front().getSectionIDNum()] =
1408 MBBSectionRange{CurrentFnBegin, CurrentFnEnd};
1409
1410 // Print out jump tables referenced by the function.
1411 emitJumpTableInfo();
1412
1413 // Emit post-function debug and/or EH information.
1414 for (const HandlerInfo &HI : Handlers) {
1415 NamedRegionTimer T(HI.TimerName, HI.TimerDescription, HI.TimerGroupName,
1416 HI.TimerGroupDescription, TimePassesIsEnabled);
1417 HI.Handler->endFunction(MF);
1418 }
1419
1420 // Emit section containing BB address offsets and their metadata, when
1421 // BB labels are requested for this function.
1422 if (MF->hasBBLabels())
1423 emitBBAddrMapSection(*MF);
1424
1425 // Emit section containing stack size metadata.
1426 emitStackSizeSection(*MF);
1427
1428 emitPatchableFunctionEntries();
1429
1430 if (isVerbose())
1431 OutStreamer->GetCommentOS() << "-- End function\n";
1432
1433 OutStreamer->AddBlankLine();
1434}
1435
1436/// Compute the number of Global Variables that uses a Constant.
1437static unsigned getNumGlobalVariableUses(const Constant *C) {
1438 if (!C)
1439 return 0;
1440
1441 if (isa<GlobalVariable>(C))
1442 return 1;
1443
1444 unsigned NumUses = 0;
1445 for (auto *CU : C->users())
1446 NumUses += getNumGlobalVariableUses(dyn_cast<Constant>(CU));
1447
1448 return NumUses;
1449}
1450
1451/// Only consider global GOT equivalents if at least one user is a
1452/// cstexpr inside an initializer of another global variables. Also, don't
1453/// handle cstexpr inside instructions. During global variable emission,
1454/// candidates are skipped and are emitted later in case at least one cstexpr
1455/// isn't replaced by a PC relative GOT entry access.
1456static bool isGOTEquivalentCandidate(const GlobalVariable *GV,
1457 unsigned &NumGOTEquivUsers) {
1458 // Global GOT equivalents are unnamed private globals with a constant
1459 // pointer initializer to another global symbol. They must point to a
1460 // GlobalVariable or Function, i.e., as GlobalValue.
1461 if (!GV->hasGlobalUnnamedAddr() || !GV->hasInitializer() ||
1462 !GV->isConstant() || !GV->isDiscardableIfUnused() ||
1463 !isa<GlobalValue>(GV->getOperand(0)))
1464 return false;
1465
1466 // To be a got equivalent, at least one of its users need to be a constant
1467 // expression used by another global variable.
1468 for (auto *U : GV->users())
1469 NumGOTEquivUsers += getNumGlobalVariableUses(dyn_cast<Constant>(U));
1470
1471 return NumGOTEquivUsers > 0;
1472}
1473
1474/// Unnamed constant global variables solely contaning a pointer to
1475/// another globals variable is equivalent to a GOT table entry; it contains the
1476/// the address of another symbol. Optimize it and replace accesses to these
1477/// "GOT equivalents" by using the GOT entry for the final global instead.
1478/// Compute GOT equivalent candidates among all global variables to avoid
1479/// emitting them if possible later on, after it use is replaced by a GOT entry
1480/// access.
1481void AsmPrinter::computeGlobalGOTEquivs(Module &M) {
1482 if (!getObjFileLowering().supportIndirectSymViaGOTPCRel())
1483 return;
1484
1485 for (const auto &G : M.globals()) {
1486 unsigned NumGOTEquivUsers = 0;
1487 if (!isGOTEquivalentCandidate(&G, NumGOTEquivUsers))
1488 continue;
1489
1490 const MCSymbol *GOTEquivSym = getSymbol(&G);
1491 GlobalGOTEquivs[GOTEquivSym] = std::make_pair(&G, NumGOTEquivUsers);
1492 }
1493}
1494
1495/// Constant expressions using GOT equivalent globals may not be eligible
1496/// for PC relative GOT entry conversion, in such cases we need to emit such
1497/// globals we previously omitted in EmitGlobalVariable.
1498void AsmPrinter::emitGlobalGOTEquivs() {
1499 if (!getObjFileLowering().supportIndirectSymViaGOTPCRel())
1500 return;
1501
1502 SmallVector<const GlobalVariable *, 8> FailedCandidates;
1503 for (auto &I : GlobalGOTEquivs) {
1504 const GlobalVariable *GV = I.second.first;
1505 unsigned Cnt = I.second.second;
1506 if (Cnt)
1507 FailedCandidates.push_back(GV);
1508 }
1509 GlobalGOTEquivs.clear();
1510
1511 for (auto *GV : FailedCandidates)
1512 emitGlobalVariable(GV);
1513}
1514
1515void AsmPrinter::emitGlobalIndirectSymbol(Module &M,
1516 const GlobalIndirectSymbol& GIS) {
1517 MCSymbol *Name = getSymbol(&GIS);
1518 bool IsFunction = GIS.getValueType()->isFunctionTy();
1519 // Treat bitcasts of functions as functions also. This is important at least
1520 // on WebAssembly where object and function addresses can't alias each other.
1521 if (!IsFunction)
1522 if (auto *CE = dyn_cast<ConstantExpr>(GIS.getIndirectSymbol()))
1523 if (CE->getOpcode() == Instruction::BitCast)
1524 IsFunction =
1525 CE->getOperand(0)->getType()->getPointerElementType()->isFunctionTy();
1526
1527 // AIX's assembly directive `.set` is not usable for aliasing purpose,
1528 // so AIX has to use the extra-label-at-definition strategy. At this
1529 // point, all the extra label is emitted, we just have to emit linkage for
1530 // those labels.
1531 if (TM.getTargetTriple().isOSBinFormatXCOFF()) {
1532 assert(!isa<GlobalIFunc>(GIS) && "IFunc is not supported on AIX.")((!isa<GlobalIFunc>(GIS) && "IFunc is not supported on AIX."
) ? static_cast<void> (0) : __assert_fail ("!isa<GlobalIFunc>(GIS) && \"IFunc is not supported on AIX.\""
, "/build/llvm-toolchain-snapshot-12~++20210115100614+a14c36fe27f5/llvm/lib/CodeGen/AsmPrinter/AsmPrinter.cpp"
, 1532, __PRETTY_FUNCTION__))
;
1533 assert(MAI->hasVisibilityOnlyWithLinkage() &&((MAI->hasVisibilityOnlyWithLinkage() && "Visibility should be handled with emitLinkage() on AIX."
) ? static_cast<void> (0) : __assert_fail ("MAI->hasVisibilityOnlyWithLinkage() && \"Visibility should be handled with emitLinkage() on AIX.\""
, "/build/llvm-toolchain-snapshot-12~++20210115100614+a14c36fe27f5/llvm/lib/CodeGen/AsmPrinter/AsmPrinter.cpp"
, 1534, __PRETTY_FUNCTION__))
1534 "Visibility should be handled with emitLinkage() on AIX.")((MAI->hasVisibilityOnlyWithLinkage() && "Visibility should be handled with emitLinkage() on AIX."
) ? static_cast<void> (0) : __assert_fail ("MAI->hasVisibilityOnlyWithLinkage() && \"Visibility should be handled with emitLinkage() on AIX.\""
, "/build/llvm-toolchain-snapshot-12~++20210115100614+a14c36fe27f5/llvm/lib/CodeGen/AsmPrinter/AsmPrinter.cpp"
, 1534, __PRETTY_FUNCTION__))
;
1535 emitLinkage(&GIS, Name);
1536 // If it's a function, also emit linkage for aliases of function entry
1537 // point.
1538 if (IsFunction)
1539 emitLinkage(&GIS,
1540 getObjFileLowering().getFunctionEntryPointSymbol(&GIS, TM));
1541 return;
1542 }
1543
1544 if (GIS.hasExternalLinkage() || !MAI->getWeakRefDirective())
1545 OutStreamer->emitSymbolAttribute(Name, MCSA_Global);
1546 else if (GIS.hasWeakLinkage() || GIS.hasLinkOnceLinkage())
1547 OutStreamer->emitSymbolAttribute(Name, MCSA_WeakReference);
1548 else
1549 assert(GIS.hasLocalLinkage() && "Invalid alias or ifunc linkage")((GIS.hasLocalLinkage() && "Invalid alias or ifunc linkage"
) ? static_cast<void> (0) : __assert_fail ("GIS.hasLocalLinkage() && \"Invalid alias or ifunc linkage\""
, "/build/llvm-toolchain-snapshot-12~++20210115100614+a14c36fe27f5/llvm/lib/CodeGen/AsmPrinter/AsmPrinter.cpp"
, 1549, __PRETTY_FUNCTION__))
;
1550
1551 // Set the symbol type to function if the alias has a function type.
1552 // This affects codegen when the aliasee is not a function.
1553 if (IsFunction)
1554 OutStreamer->emitSymbolAttribute(Name, isa<GlobalIFunc>(GIS)
1555 ? MCSA_ELF_TypeIndFunction
1556 : MCSA_ELF_TypeFunction);
1557
1558 emitVisibility(Name, GIS.getVisibility());
1559
1560 const MCExpr *Expr = lowerConstant(GIS.getIndirectSymbol());
1561
1562 if (isa<GlobalAlias>(&GIS) && MAI->hasAltEntry() && isa<MCBinaryExpr>(Expr))
1563 OutStreamer->emitSymbolAttribute(Name, MCSA_AltEntry);
1564
1565 // Emit the directives as assignments aka .set:
1566 OutStreamer->emitAssignment(Name, Expr);
1567 MCSymbol *LocalAlias = getSymbolPreferLocal(GIS);
1568 if (LocalAlias != Name)
1569 OutStreamer->emitAssignment(LocalAlias, Expr);
1570
1571 if (auto *GA = dyn_cast<GlobalAlias>(&GIS)) {
1572 // If the aliasee does not correspond to a symbol in the output, i.e. the
1573 // alias is not of an object or the aliased object is private, then set the
1574 // size of the alias symbol from the type of the alias. We don't do this in
1575 // other situations as the alias and aliasee having differing types but same
1576 // size may be intentional.
1577 const GlobalObject *BaseObject = GA->getBaseObject();
1578 if (MAI->hasDotTypeDotSizeDirective() && GA->getValueType()->isSized() &&
1579 (!BaseObject || BaseObject->hasPrivateLinkage())) {
1580 const DataLayout &DL = M.getDataLayout();
1581 uint64_t Size = DL.getTypeAllocSize(GA->getValueType());
1582 OutStreamer->emitELFSize(Name, MCConstantExpr::create(Size, OutContext));
1583 }
1584 }
1585}
1586
1587void AsmPrinter::emitRemarksSection(remarks::RemarkStreamer &RS) {
1588 if (!RS.needsSection())
1589 return;
1590
1591 remarks::RemarkSerializer &RemarkSerializer = RS.getSerializer();
1592
1593 Optional<SmallString<128>> Filename;
1594 if (Optional<StringRef> FilenameRef = RS.getFilename()) {
1595 Filename = *FilenameRef;
1596 sys::fs::make_absolute(*Filename);
1597 assert(!Filename->empty() && "The filename can't be empty.")((!Filename->empty() && "The filename can't be empty."
) ? static_cast<void> (0) : __assert_fail ("!Filename->empty() && \"The filename can't be empty.\""
, "/build/llvm-toolchain-snapshot-12~++20210115100614+a14c36fe27f5/llvm/lib/CodeGen/AsmPrinter/AsmPrinter.cpp"
, 1597, __PRETTY_FUNCTION__))
;
1598 }
1599
1600 std::string Buf;
1601 raw_string_ostream OS(Buf);
1602 std::unique_ptr<remarks::MetaSerializer> MetaSerializer =
1603 Filename ? RemarkSerializer.metaSerializer(OS, StringRef(*Filename))
1604 : RemarkSerializer.metaSerializer(OS);
1605 MetaSerializer->emit();
1606
1607 // Switch to the remarks section.
1608 MCSection *RemarksSection =
1609 OutContext.getObjectFileInfo()->getRemarksSection();
1610 OutStreamer->SwitchSection(RemarksSection);
1611
1612 OutStreamer->emitBinaryData(OS.str());
1613}
1614
1615bool AsmPrinter::doFinalization(Module &M) {
1616 // Set the MachineFunction to nullptr so that we can catch attempted
1617 // accesses to MF specific features at the module level and so that
1618 // we can conditionalize accesses based on whether or not it is nullptr.
1619 MF = nullptr;
1620
1621 // Gather all GOT equivalent globals in the module. We really need two
1622 // passes over the globals: one to compute and another to avoid its emission
1623 // in EmitGlobalVariable, otherwise we would not be able to handle cases
1624 // where the got equivalent shows up before its use.
1625 computeGlobalGOTEquivs(M);
1626
1627 // Emit global variables.
1628 for (const auto &G : M.globals())
1629 emitGlobalVariable(&G);
1630
1631 // Emit remaining GOT equivalent globals.
1632 emitGlobalGOTEquivs();
1633
1634 const TargetLoweringObjectFile &TLOF = getObjFileLowering();
1635
1636 // Emit linkage(XCOFF) and visibility info for declarations
1637 for (const Function &F : M) {
1638 if (!F.isDeclarationForLinker())
1639 continue;
1640
1641 MCSymbol *Name = getSymbol(&F);
1642 // Function getSymbol gives us the function descriptor symbol for XCOFF.
1643
1644 if (!TM.getTargetTriple().isOSBinFormatXCOFF()) {
1645 GlobalValue::VisibilityTypes V = F.getVisibility();
1646 if (V == GlobalValue::DefaultVisibility)
1647 continue;
1648
1649 emitVisibility(Name, V, false);
1650 continue;
1651 }
1652
1653 if (F.isIntrinsic())
1654 continue;
1655
1656 // Handle the XCOFF case.
1657 // Variable `Name` is the function descriptor symbol (see above). Get the
1658 // function entry point symbol.
1659 MCSymbol *FnEntryPointSym = TLOF.getFunctionEntryPointSymbol(&F, TM);
1660 // Emit linkage for the function entry point.
1661 emitLinkage(&F, FnEntryPointSym);
1662
1663 // Emit linkage for the function descriptor.
1664 emitLinkage(&F, Name);
1665 }
1666
1667 // Emit the remarks section contents.
1668 // FIXME: Figure out when is the safest time to emit this section. It should
1669 // not come after debug info.
1670 if (remarks::RemarkStreamer *RS = M.getContext().getMainRemarkStreamer())
1671 emitRemarksSection(*RS);
1672
1673 TLOF.emitModuleMetadata(*OutStreamer, M);
1674
1675 if (TM.getTargetTriple().isOSBinFormatELF()) {
1676 MachineModuleInfoELF &MMIELF = MMI->getObjFileInfo<MachineModuleInfoELF>();
1677
1678 // Output stubs for external and common global variables.
1679 MachineModuleInfoELF::SymbolListTy Stubs = MMIELF.GetGVStubList();
1680 if (!Stubs.empty()) {
1681 OutStreamer->SwitchSection(TLOF.getDataSection());
1682 const DataLayout &DL = M.getDataLayout();
1683
1684 emitAlignment(Align(DL.getPointerSize()));
1685 for (const auto &Stub : Stubs) {
1686 OutStreamer->emitLabel(Stub.first);
1687 OutStreamer->emitSymbolValue(Stub.second.getPointer(),
1688 DL.getPointerSize());
1689 }
1690 }
1691 }
1692
1693 if (TM.getTargetTriple().isOSBinFormatCOFF()) {
1694 MachineModuleInfoCOFF &MMICOFF =
1695 MMI->getObjFileInfo<MachineModuleInfoCOFF>();
1696
1697 // Output stubs for external and common global variables.
1698 MachineModuleInfoCOFF::SymbolListTy Stubs = MMICOFF.GetGVStubList();
1699 if (!Stubs.empty()) {
1700 const DataLayout &DL = M.getDataLayout();
1701
1702 for (const auto &Stub : Stubs) {
1703 SmallString<256> SectionName = StringRef(".rdata$");
1704 SectionName += Stub.first->getName();
1705 OutStreamer->SwitchSection(OutContext.getCOFFSection(
1706 SectionName,
1707 COFF::IMAGE_SCN_CNT_INITIALIZED_DATA | COFF::IMAGE_SCN_MEM_READ |
1708 COFF::IMAGE_SCN_LNK_COMDAT,
1709 SectionKind::getReadOnly(), Stub.first->getName(),
1710 COFF::IMAGE_COMDAT_SELECT_ANY));
1711 emitAlignment(Align(DL.getPointerSize()));
1712 OutStreamer->emitSymbolAttribute(Stub.first, MCSA_Global);
1713 OutStreamer->emitLabel(Stub.first);
1714 OutStreamer->emitSymbolValue(Stub.second.getPointer(),
1715 DL.getPointerSize());
1716 }
1717 }
1718 }
1719
1720 // Finalize debug and EH information.
1721 for (const HandlerInfo &HI : Handlers) {
1722 NamedRegionTimer T(HI.TimerName, HI.TimerDescription, HI.TimerGroupName,
1723 HI.TimerGroupDescription, TimePassesIsEnabled);
1724 HI.Handler->endModule();
1725 }
1726
1727 // This deletes all the ephemeral handlers that AsmPrinter added, while
1728 // keeping all the user-added handlers alive until the AsmPrinter is
1729 // destroyed.
1730 Handlers.erase(Handlers.begin() + NumUserHandlers, Handlers.end());
1731 DD = nullptr;
1732
1733 // If the target wants to know about weak references, print them all.
1734 if (MAI->getWeakRefDirective()) {
1735 // FIXME: This is not lazy, it would be nice to only print weak references
1736 // to stuff that is actually used. Note that doing so would require targets
1737 // to notice uses in operands (due to constant exprs etc). This should
1738 // happen with the MC stuff eventually.
1739
1740 // Print out module-level global objects here.
1741 for (const auto &GO : M.global_objects()) {
1742 if (!GO.hasExternalWeakLinkage())
1743 continue;
1744 OutStreamer->emitSymbolAttribute(getSymbol(&GO), MCSA_WeakReference);
1745 }
1746 }
1747
1748 // Print aliases in topological order, that is, for each alias a = b,
1749 // b must be printed before a.
1750 // This is because on some targets (e.g. PowerPC) linker expects aliases in
1751 // such an order to generate correct TOC information.
1752 SmallVector<const GlobalAlias *, 16> AliasStack;
1753 SmallPtrSet<const GlobalAlias *, 16> AliasVisited;
1754 for (const auto &Alias : M.aliases()) {
1755 for (const GlobalAlias *Cur = &Alias; Cur;
1756 Cur = dyn_cast<GlobalAlias>(Cur->getAliasee())) {
1757 if (!AliasVisited.insert(Cur).second)
1758 break;
1759 AliasStack.push_back(Cur);
1760 }
1761 for (const GlobalAlias *AncestorAlias : llvm::reverse(AliasStack))
1762 emitGlobalIndirectSymbol(M, *AncestorAlias);
1763 AliasStack.clear();
1764 }
1765 for (const auto &IFunc : M.ifuncs())
1766 emitGlobalIndirectSymbol(M, IFunc);
1767
1768 GCModuleInfo *MI = getAnalysisIfAvailable<GCModuleInfo>();
1769 assert(MI && "AsmPrinter didn't require GCModuleInfo?")((MI && "AsmPrinter didn't require GCModuleInfo?") ? static_cast
<void> (0) : __assert_fail ("MI && \"AsmPrinter didn't require GCModuleInfo?\""
, "/build/llvm-toolchain-snapshot-12~++20210115100614+a14c36fe27f5/llvm/lib/CodeGen/AsmPrinter/AsmPrinter.cpp"
, 1769, __PRETTY_FUNCTION__))
;
1770 for (GCModuleInfo::iterator I = MI->end(), E = MI->begin(); I != E; )
1771 if (GCMetadataPrinter *MP = GetOrCreateGCPrinter(**--I))
1772 MP->finishAssembly(M, *MI, *this);
1773
1774 // Emit llvm.ident metadata in an '.ident' directive.
1775 emitModuleIdents(M);
1776
1777 // Emit bytes for llvm.commandline metadata.
1778 emitModuleCommandLines(M);
1779
1780 // Emit __morestack address if needed for indirect calls.
1781 if (MMI->usesMorestackAddr()) {
1782 Align Alignment(1);
1783 MCSection *ReadOnlySection = getObjFileLowering().getSectionForConstant(
1784 getDataLayout(), SectionKind::getReadOnly(),
1785 /*C=*/nullptr, Alignment);
1786 OutStreamer->SwitchSection(ReadOnlySection);
1787
1788 MCSymbol *AddrSymbol =
1789 OutContext.getOrCreateSymbol(StringRef("__morestack_addr"));
1790 OutStreamer->emitLabel(AddrSymbol);
1791
1792 unsigned PtrSize = MAI->getCodePointerSize();
1793 OutStreamer->emitSymbolValue(GetExternalSymbolSymbol("__morestack"),
1794 PtrSize);
1795 }
1796
1797 // Emit .note.GNU-split-stack and .note.GNU-no-split-stack sections if
1798 // split-stack is used.
1799 if (TM.getTargetTriple().isOSBinFormatELF() && MMI->hasSplitStack()) {
1800 OutStreamer->SwitchSection(
1801 OutContext.getELFSection(".note.GNU-split-stack", ELF::SHT_PROGBITS, 0));
1802 if (MMI->hasNosplitStack())
1803 OutStreamer->SwitchSection(
1804 OutContext.getELFSection(".note.GNU-no-split-stack", ELF::SHT_PROGBITS, 0));
1805 }
1806
1807 // If we don't have any trampolines, then we don't require stack memory
1808 // to be executable. Some targets have a directive to declare this.
1809 Function *InitTrampolineIntrinsic = M.getFunction("llvm.init.trampoline");
1810 if (!InitTrampolineIntrinsic || InitTrampolineIntrinsic->use_empty())
1811 if (MCSection *S = MAI->getNonexecutableStackSection(OutContext))
1812 OutStreamer->SwitchSection(S);
1813
1814 if (TM.Options.EmitAddrsig) {
1815 // Emit address-significance attributes for all globals.
1816 OutStreamer->emitAddrsig();
1817 for (const GlobalValue &GV : M.global_values())
1818 if (!GV.use_empty() && !GV.isThreadLocal() &&
1819 !GV.hasDLLImportStorageClass() && !GV.getName().startswith("llvm.") &&
1820 !GV.hasAtLeastLocalUnnamedAddr())
1821 OutStreamer->emitAddrsigSym(getSymbol(&GV));
1822 }
1823
1824 // Emit symbol partition specifications (ELF only).
1825 if (TM.getTargetTriple().isOSBinFormatELF()) {
1826 unsigned UniqueID = 0;
1827 for (const GlobalValue &GV : M.global_values()) {
1828 if (!GV.hasPartition() || GV.isDeclarationForLinker() ||
1829 GV.getVisibility() != GlobalValue::DefaultVisibility)
1830 continue;
1831
1832 OutStreamer->SwitchSection(
1833 OutContext.getELFSection(".llvm_sympart", ELF::SHT_LLVM_SYMPART, 0, 0,
1834 "", ++UniqueID, nullptr));
1835 OutStreamer->emitBytes(GV.getPartition());
1836 OutStreamer->emitZeros(1);
1837 OutStreamer->emitValue(
1838 MCSymbolRefExpr::create(getSymbol(&GV), OutContext),
1839 MAI->getCodePointerSize());
1840 }
1841 }
1842
1843 // Allow the target to emit any magic that it wants at the end of the file,
1844 // after everything else has gone out.
1845 emitEndOfAsmFile(M);
1846
1847 MMI = nullptr;
1848
1849 OutStreamer->Finish();
1850 OutStreamer->reset();
1851 OwnedMLI.reset();
1852 OwnedMDT.reset();
1853
1854 return false;
1855}
1856
1857MCSymbol *AsmPrinter::getMBBExceptionSym(const MachineBasicBlock &MBB) {
1858 auto Res = MBBSectionExceptionSyms.try_emplace(MBB.getSectionIDNum());
1859 if (Res.second)
1860 Res.first->second = createTempSymbol("exception");
1861 return Res.first->second;
1862}
1863
1864void AsmPrinter::SetupMachineFunction(MachineFunction &MF) {
1865 this->MF = &MF;
1866 const Function &F = MF.getFunction();
1867
1868 // Get the function symbol.
1869 if (!MAI->needsFunctionDescriptors()) {
1870 CurrentFnSym = getSymbol(&MF.getFunction());
1871 } else {
1872 assert(TM.getTargetTriple().isOSAIX() &&((TM.getTargetTriple().isOSAIX() && "Only AIX uses the function descriptor hooks."
) ? static_cast<void> (0) : __assert_fail ("TM.getTargetTriple().isOSAIX() && \"Only AIX uses the function descriptor hooks.\""
, "/build/llvm-toolchain-snapshot-12~++20210115100614+a14c36fe27f5/llvm/lib/CodeGen/AsmPrinter/AsmPrinter.cpp"
, 1873, __PRETTY_FUNCTION__))
1873 "Only AIX uses the function descriptor hooks.")((TM.getTargetTriple().isOSAIX() && "Only AIX uses the function descriptor hooks."
) ? static_cast<void> (0) : __assert_fail ("TM.getTargetTriple().isOSAIX() && \"Only AIX uses the function descriptor hooks.\""
, "/build/llvm-toolchain-snapshot-12~++20210115100614+a14c36fe27f5/llvm/lib/CodeGen/AsmPrinter/AsmPrinter.cpp"
, 1873, __PRETTY_FUNCTION__))
;
1874 // AIX is unique here in that the name of the symbol emitted for the
1875 // function body does not have the same name as the source function's
1876 // C-linkage name.
1877 assert(CurrentFnDescSym && "The function descriptor symbol needs to be"((CurrentFnDescSym && "The function descriptor symbol needs to be"
" initalized first.") ? static_cast<void> (0) : __assert_fail
("CurrentFnDescSym && \"The function descriptor symbol needs to be\" \" initalized first.\""
, "/build/llvm-toolchain-snapshot-12~++20210115100614+a14c36fe27f5/llvm/lib/CodeGen/AsmPrinter/AsmPrinter.cpp"
, 1878, __PRETTY_FUNCTION__))
1878 " initalized first.")((CurrentFnDescSym && "The function descriptor symbol needs to be"
" initalized first.") ? static_cast<void> (0) : __assert_fail
("CurrentFnDescSym && \"The function descriptor symbol needs to be\" \" initalized first.\""
, "/build/llvm-toolchain-snapshot-12~++20210115100614+a14c36fe27f5/llvm/lib/CodeGen/AsmPrinter/AsmPrinter.cpp"
, 1878, __PRETTY_FUNCTION__))
;
1879
1880 // Get the function entry point symbol.
1881 CurrentFnSym = getObjFileLowering().getFunctionEntryPointSymbol(&F, TM);
1882 }
1883
1884 CurrentFnSymForSize = CurrentFnSym;
1885 CurrentFnBegin = nullptr;
1886 CurrentSectionBeginSym = nullptr;
1887 MBBSectionRanges.clear();
1888 MBBSectionExceptionSyms.clear();
1889 bool NeedsLocalForSize = MAI->needsLocalForSize();
1890 if (F.hasFnAttribute("patchable-function-entry") ||
1891 F.hasFnAttribute("function-instrument") ||
1892 F.hasFnAttribute("xray-instruction-threshold") ||
1893 needFuncLabelsForEHOrDebugInfo(MF) || NeedsLocalForSize ||
1894 MF.getTarget().Options.EmitStackSizeSection || MF.hasBBLabels()) {
1895 CurrentFnBegin = createTempSymbol("func_begin");
1896 if (NeedsLocalForSize)
1897 CurrentFnSymForSize = CurrentFnBegin;
1898 }
1899
1900 ORE = &getAnalysis<MachineOptimizationRemarkEmitterPass>().getORE();
1901}
1902
1903namespace {
1904
1905// Keep track the alignment, constpool entries per Section.
1906 struct SectionCPs {
1907 MCSection *S;
1908 Align Alignment;
1909 SmallVector<unsigned, 4> CPEs;
1910
1911 SectionCPs(MCSection *s, Align a) : S(s), Alignment(a) {}
1912 };
1913
1914} // end anonymous namespace
1915
1916/// EmitConstantPool - Print to the current output stream assembly
1917/// representations of the constants in the constant pool MCP. This is
1918/// used to print out constants which have been "spilled to memory" by
1919/// the code generator.
1920void AsmPrinter::emitConstantPool() {
1921 const MachineConstantPool *MCP = MF->getConstantPool();
1922 const std::vector<MachineConstantPoolEntry> &CP = MCP->getConstants();
1923 if (CP.empty()) return;
1924
1925 // Calculate sections for constant pool entries. We collect entries to go into
1926 // the same section together to reduce amount of section switch statements.
1927 SmallVector<SectionCPs, 4> CPSections;
1928 for (unsigned i = 0, e = CP.size(); i != e; ++i) {
1929 const MachineConstantPoolEntry &CPE = CP[i];
1930 Align Alignment = CPE.getAlign();
1931
1932 SectionKind Kind = CPE.getSectionKind(&getDataLayout());
1933
1934 const Constant *C = nullptr;
1935 if (!CPE.isMachineConstantPoolEntry())
1936 C = CPE.Val.ConstVal;
1937
1938 MCSection *S = getObjFileLowering().getSectionForConstant(
1939 getDataLayout(), Kind, C, Alignment);
1940
1941 // The number of sections are small, just do a linear search from the
1942 // last section to the first.
1943 bool Found = false;
1944 unsigned SecIdx = CPSections.size();
1945 while (SecIdx != 0) {
1946 if (CPSections[--SecIdx].S == S) {
1947 Found = true;
1948 break;
1949 }
1950 }
1951 if (!Found) {
1952 SecIdx = CPSections.size();
1953 CPSections.push_back(SectionCPs(S, Alignment));
1954 }
1955
1956 if (Alignment > CPSections[SecIdx].Alignment)
1957 CPSections[SecIdx].Alignment = Alignment;
1958 CPSections[SecIdx].CPEs.push_back(i);
1959 }
1960
1961 // Now print stuff into the calculated sections.
1962 const MCSection *CurSection = nullptr;
1963 unsigned Offset = 0;
1964 for (unsigned i = 0, e = CPSections.size(); i != e; ++i) {
1965 for (unsigned j = 0, ee = CPSections[i].CPEs.size(); j != ee; ++j) {
1966 unsigned CPI = CPSections[i].CPEs[j];
1967 MCSymbol *Sym = GetCPISymbol(CPI);
1968 if (!Sym->isUndefined())
1969 continue;
1970
1971 if (CurSection != CPSections[i].S) {
1972 OutStreamer->SwitchSection(CPSections[i].S);
1973 emitAlignment(Align(CPSections[i].Alignment));
1974 CurSection = CPSections[i].S;
1975 Offset = 0;
1976 }
1977
1978 MachineConstantPoolEntry CPE = CP[CPI];
1979
1980 // Emit inter-object padding for alignment.
1981 unsigned NewOffset = alignTo(Offset, CPE.getAlign());
1982 OutStreamer->emitZeros(NewOffset - Offset);
1983
1984 Offset = NewOffset + CPE.getSizeInBytes(getDataLayout());
1985
1986 OutStreamer->emitLabel(Sym);
1987 if (CPE.isMachineConstantPoolEntry())
1988 emitMachineConstantPoolValue(CPE.Val.MachineCPVal);
1989 else
1990 emitGlobalConstant(getDataLayout(), CPE.Val.ConstVal);
1991 }
1992 }
1993}
1994
1995// Print assembly representations of the jump tables used by the current
1996// function.
1997void AsmPrinter::emitJumpTableInfo() {
1998 const DataLayout &DL = MF->getDataLayout();
1999 const MachineJumpTableInfo *MJTI = MF->getJumpTableInfo();
2000 if (!MJTI) return;
2001 if (MJTI->getEntryKind() == MachineJumpTableInfo::EK_Inline) return;
2002 const std::vector<MachineJumpTableEntry> &JT = MJTI->getJumpTables();
2003 if (JT.empty()) return;
2004
2005 // Pick the directive to use to print the jump table entries, and switch to
2006 // the appropriate section.
2007 const Function &F = MF->getFunction();
2008 const TargetLoweringObjectFile &TLOF = getObjFileLowering();
2009 bool JTInDiffSection = !TLOF.shouldPutJumpTableInFunctionSection(
2010 MJTI->getEntryKind() == MachineJumpTableInfo::EK_LabelDifference32,
2011 F);
2012 if (JTInDiffSection) {
2013 // Drop it in the readonly section.
2014 MCSection *ReadOnlySection = TLOF.getSectionForJumpTable(F, TM);
2015 OutStreamer->SwitchSection(ReadOnlySection);
2016 }
2017
2018 emitAlignment(Align(MJTI->getEntryAlignment(DL)));
2019
2020 // Jump tables in code sections are marked with a data_region directive
2021 // where that's supported.
2022 if (!JTInDiffSection)
2023 OutStreamer->emitDataRegion(MCDR_DataRegionJT32);
2024
2025 for (unsigned JTI = 0, e = JT.size(); JTI != e; ++JTI) {
2026 const std::vector<MachineBasicBlock*> &JTBBs = JT[JTI].MBBs;
2027
2028 // If this jump table was deleted, ignore it.
2029 if (JTBBs.empty()) continue;
2030
2031 // For the EK_LabelDifference32 entry, if using .set avoids a relocation,
2032 /// emit a .set directive for each unique entry.
2033 if (MJTI->getEntryKind() == MachineJumpTableInfo::EK_LabelDifference32 &&
2034 MAI->doesSetDirectiveSuppressReloc()) {
2035 SmallPtrSet<const MachineBasicBlock*, 16> EmittedSets;
2036 const TargetLowering *TLI = MF->getSubtarget().getTargetLowering();
2037 const MCExpr *Base = TLI->getPICJumpTableRelocBaseExpr(MF,JTI,OutContext);
2038 for (unsigned ii = 0, ee = JTBBs.size(); ii != ee; ++ii) {
2039 const MachineBasicBlock *MBB = JTBBs[ii];
2040 if (!EmittedSets.insert(MBB).second)
2041 continue;
2042
2043 // .set LJTSet, LBB32-base
2044 const MCExpr *LHS =
2045 MCSymbolRefExpr::create(MBB->getSymbol(), OutContext);
2046 OutStreamer->emitAssignment(GetJTSetSymbol(JTI, MBB->getNumber()),
2047 MCBinaryExpr::createSub(LHS, Base,
2048 OutContext));
2049 }
2050 }
2051
2052 // On some targets (e.g. Darwin) we want to emit two consecutive labels
2053 // before each jump table. The first label is never referenced, but tells
2054 // the assembler and linker the extents of the jump table object. The
2055 // second label is actually referenced by the code.
2056 if (JTInDiffSection && DL.hasLinkerPrivateGlobalPrefix())
2057 // FIXME: This doesn't have to have any specific name, just any randomly
2058 // named and numbered local label started with 'l' would work. Simplify
2059 // GetJTISymbol.
2060 OutStreamer->emitLabel(GetJTISymbol(JTI, true));
2061
2062 MCSymbol* JTISymbol = GetJTISymbol(JTI);
2063 OutStreamer->emitLabel(JTISymbol);
2064
2065 for (unsigned ii = 0, ee = JTBBs.size(); ii != ee; ++ii)
2066 emitJumpTableEntry(MJTI, JTBBs[ii], JTI);
2067 }
2068 if (!JTInDiffSection)
2069 OutStreamer->emitDataRegion(MCDR_DataRegionEnd);
2070}
2071
2072/// EmitJumpTableEntry - Emit a jump table entry for the specified MBB to the
2073/// current stream.
2074void AsmPrinter::emitJumpTableEntry(const MachineJumpTableInfo *MJTI,
2075 const MachineBasicBlock *MBB,
2076 unsigned UID) const {
2077 assert(MBB && MBB->getNumber() >= 0 && "Invalid basic block")((MBB && MBB->getNumber() >= 0 && "Invalid basic block"
) ? static_cast<void> (0) : __assert_fail ("MBB && MBB->getNumber() >= 0 && \"Invalid basic block\""
, "/build/llvm-toolchain-snapshot-12~++20210115100614+a14c36fe27f5/llvm/lib/CodeGen/AsmPrinter/AsmPrinter.cpp"
, 2077, __PRETTY_FUNCTION__))
;
2078 const MCExpr *Value = nullptr;
2079 switch (MJTI->getEntryKind()) {
2080 case MachineJumpTableInfo::EK_Inline:
2081 llvm_unreachable("Cannot emit EK_Inline jump table entry")::llvm::llvm_unreachable_internal("Cannot emit EK_Inline jump table entry"
, "/build/llvm-toolchain-snapshot-12~++20210115100614+a14c36fe27f5/llvm/lib/CodeGen/AsmPrinter/AsmPrinter.cpp"
, 2081)
;
2082 case MachineJumpTableInfo::EK_Custom32:
2083 Value = MF->getSubtarget().getTargetLowering()->LowerCustomJumpTableEntry(
2084 MJTI, MBB, UID, OutContext);
2085 break;
2086 case MachineJumpTableInfo::EK_BlockAddress:
2087 // EK_BlockAddress - Each entry is a plain address of block, e.g.:
2088 // .word LBB123
2089 Value = MCSymbolRefExpr::create(MBB->getSymbol(), OutContext);
2090 break;
2091 case MachineJumpTableInfo::EK_GPRel32BlockAddress: {
2092 // EK_GPRel32BlockAddress - Each entry is an address of block, encoded
2093 // with a relocation as gp-relative, e.g.:
2094 // .gprel32 LBB123
2095 MCSymbol *MBBSym = MBB->getSymbol();
2096 OutStreamer->emitGPRel32Value(MCSymbolRefExpr::create(MBBSym, OutContext));
2097 return;
2098 }
2099
2100 case MachineJumpTableInfo::EK_GPRel64BlockAddress: {
2101 // EK_GPRel64BlockAddress - Each entry is an address of block, encoded
2102 // with a relocation as gp-relative, e.g.:
2103 // .gpdword LBB123
2104 MCSymbol *MBBSym = MBB->getSymbol();
2105 OutStreamer->emitGPRel64Value(MCSymbolRefExpr::create(MBBSym, OutContext));
2106 return;
2107 }
2108
2109 case MachineJumpTableInfo::EK_LabelDifference32: {
2110 // Each entry is the address of the block minus the address of the jump
2111 // table. This is used for PIC jump tables where gprel32 is not supported.
2112 // e.g.:
2113 // .word LBB123 - LJTI1_2
2114 // If the .set directive avoids relocations, this is emitted as:
2115 // .set L4_5_set_123, LBB123 - LJTI1_2
2116 // .word L4_5_set_123
2117 if (MAI->doesSetDirectiveSuppressReloc()) {
2118 Value = MCSymbolRefExpr::create(GetJTSetSymbol(UID, MBB->getNumber()),
2119 OutContext);
2120 break;
2121 }
2122 Value = MCSymbolRefExpr::create(MBB->getSymbol(), OutContext);
2123 const TargetLowering *TLI = MF->getSubtarget().getTargetLowering();
2124 const MCExpr *Base = TLI->getPICJumpTableRelocBaseExpr(MF, UID, OutContext);
2125 Value = MCBinaryExpr::createSub(Value, Base, OutContext);
2126 break;
2127 }
2128 }
2129
2130 assert(Value && "Unknown entry kind!")((Value && "Unknown entry kind!") ? static_cast<void
> (0) : __assert_fail ("Value && \"Unknown entry kind!\""
, "/build/llvm-toolchain-snapshot-12~++20210115100614+a14c36fe27f5/llvm/lib/CodeGen/AsmPrinter/AsmPrinter.cpp"
, 2130, __PRETTY_FUNCTION__))
;
2131
2132 unsigned EntrySize = MJTI->getEntrySize(getDataLayout());
2133 OutStreamer->emitValue(Value, EntrySize);
2134}
2135
2136/// EmitSpecialLLVMGlobal - Check to see if the specified global is a
2137/// special global used by LLVM. If so, emit it and return true, otherwise
2138/// do nothing and return false.
2139bool AsmPrinter::emitSpecialLLVMGlobal(const GlobalVariable *GV) {
2140 if (GV->getName() == "llvm.used") {
2141 if (MAI->hasNoDeadStrip()) // No need to emit this at all.
2142 emitLLVMUsedList(cast<ConstantArray>(GV->getInitializer()));
2143 return true;
2144 }
2145
2146 // Ignore debug and non-emitted data. This handles llvm.compiler.used.
2147 if (GV->getSection() == "llvm.metadata" ||
2148 GV->hasAvailableExternallyLinkage())
2149 return true;
2150
2151 if (!GV->hasAppendingLinkage()) return false;
2152
2153 assert(GV->hasInitializer() && "Not a special LLVM global!")((GV->hasInitializer() && "Not a special LLVM global!"
) ? static_cast<void> (0) : __assert_fail ("GV->hasInitializer() && \"Not a special LLVM global!\""
, "/build/llvm-toolchain-snapshot-12~++20210115100614+a14c36fe27f5/llvm/lib/CodeGen/AsmPrinter/AsmPrinter.cpp"
, 2153, __PRETTY_FUNCTION__))
;
2154
2155 if (GV->getName() == "llvm.global_ctors") {
2156 emitXXStructorList(GV->getParent()->getDataLayout(), GV->getInitializer(),
2157 /* isCtor */ true);
2158
2159 return true;
2160 }
2161
2162 if (GV->getName() == "llvm.global_dtors") {
2163 emitXXStructorList(GV->getParent()->getDataLayout(), GV->getInitializer(),
2164 /* isCtor */ false);
2165
2166 return true;
2167 }
2168
2169 report_fatal_error("unknown special variable");
2170}
2171
2172/// EmitLLVMUsedList - For targets that define a MAI::UsedDirective, mark each
2173/// global in the specified llvm.used list.
2174void AsmPrinter::emitLLVMUsedList(const ConstantArray *InitList) {
2175 // Should be an array of 'i8*'.
2176 for (unsigned i = 0, e = InitList->getNumOperands(); i != e; ++i) {
2177 const GlobalValue *GV =
2178 dyn_cast<GlobalValue>(InitList->getOperand(i)->stripPointerCasts());
2179 if (GV)
2180 OutStreamer->emitSymbolAttribute(getSymbol(GV), MCSA_NoDeadStrip);
2181 }
2182}
2183
2184void AsmPrinter::preprocessXXStructorList(const DataLayout &DL,
2185 const Constant *List,
2186 SmallVector<Structor, 8> &Structors) {
2187 // Should be an array of '{ i32, void ()*, i8* }' structs. The first value is
2188 // the init priority.
2189 if (!isa<ConstantArray>(List))
2190 return;
2191
2192 // Gather the structors in a form that's convenient for sorting by priority.
2193 for (Value *O : cast<ConstantArray>(List)->operands()) {
2194 auto *CS = cast<ConstantStruct>(O);
2195 if (CS->getOperand(1)->isNullValue())
2196 break; // Found a null terminator, skip the rest.
2197 ConstantInt *Priority = dyn_cast<ConstantInt>(CS->getOperand(0));
2198 if (!Priority)
2199 continue; // Malformed.
2200 Structors.push_back(Structor());
2201 Structor &S = Structors.back();
2202 S.Priority = Priority->getLimitedValue(65535);
2203 S.Func = CS->getOperand(1);
2204 if (!CS->getOperand(2)->isNullValue()) {
2205 if (TM.getTargetTriple().isOSAIX())
2206 llvm::report_fatal_error(
2207 "associated data of XXStructor list is not yet supported on AIX");
2208 S.ComdatKey =
2209 dyn_cast<GlobalValue>(CS->getOperand(2)->stripPointerCasts());
2210 }
2211 }
2212
2213 // Emit the function pointers in the target-specific order
2214 llvm::stable_sort(Structors, [](const Structor &L, const Structor &R) {
2215 return L.Priority < R.Priority;
2216 });
2217}
2218
2219/// EmitXXStructorList - Emit the ctor or dtor list taking into account the init
2220/// priority.
2221void AsmPrinter::emitXXStructorList(const DataLayout &DL, const Constant *List,
2222 bool IsCtor) {
2223 SmallVector<Structor, 8> Structors;
2224 preprocessXXStructorList(DL, List, Structors);
2225 if (Structors.empty())
2226 return;
2227
2228 const Align Align = DL.getPointerPrefAlignment();
2229 for (Structor &S : Structors) {
2230 const TargetLoweringObjectFile &Obj = getObjFileLowering();
2231 const MCSymbol *KeySym = nullptr;
2232 if (GlobalValue *GV = S.ComdatKey) {
2233 if (GV->isDeclarationForLinker())
2234 // If the associated variable is not defined in this module
2235 // (it might be available_externally, or have been an
2236 // available_externally definition that was dropped by the
2237 // EliminateAvailableExternally pass), some other TU
2238 // will provide its dynamic initializer.
2239 continue;
2240
2241 KeySym = getSymbol(GV);
2242 }
2243
2244 MCSection *OutputSection =
2245 (IsCtor ? Obj.getStaticCtorSection(S.Priority, KeySym)
2246 : Obj.getStaticDtorSection(S.Priority, KeySym));
2247 OutStreamer->SwitchSection(OutputSection);
2248 if (OutStreamer->getCurrentSection() != OutStreamer->getPreviousSection())
2249 emitAlignment(Align);
2250 emitXXStructor(DL, S.Func);
2251 }
2252}
2253
2254void AsmPrinter::emitModuleIdents(Module &M) {
2255 if (!MAI->hasIdentDirective())
2256 return;
2257
2258 if (const NamedMDNode *NMD = M.getNamedMetadata("llvm.ident")) {
2259 for (unsigned i = 0, e = NMD->getNumOperands(); i != e; ++i) {
2260 const MDNode *N = NMD->getOperand(i);
2261 assert(N->getNumOperands() == 1 &&((N->getNumOperands() == 1 && "llvm.ident metadata entry can have only one operand"
) ? static_cast<void> (0) : __assert_fail ("N->getNumOperands() == 1 && \"llvm.ident metadata entry can have only one operand\""
, "/build/llvm-toolchain-snapshot-12~++20210115100614+a14c36fe27f5/llvm/lib/CodeGen/AsmPrinter/AsmPrinter.cpp"
, 2262, __PRETTY_FUNCTION__))
2262 "llvm.ident metadata entry can have only one operand")((N->getNumOperands() == 1 && "llvm.ident metadata entry can have only one operand"
) ? static_cast<void> (0) : __assert_fail ("N->getNumOperands() == 1 && \"llvm.ident metadata entry can have only one operand\""
, "/build/llvm-toolchain-snapshot-12~++20210115100614+a14c36fe27f5/llvm/lib/CodeGen/AsmPrinter/AsmPrinter.cpp"
, 2262, __PRETTY_FUNCTION__))
;
2263 const MDString *S = cast<MDString>(N->getOperand(0));
2264 OutStreamer->emitIdent(S->getString());
2265 }
2266 }
2267}
2268
2269void AsmPrinter::emitModuleCommandLines(Module &M) {
2270 MCSection *CommandLine = getObjFileLowering().getSectionForCommandLines();
2271 if (!CommandLine)
2272 return;
2273
2274 const NamedMDNode *NMD = M.getNamedMetadata("llvm.commandline");
2275 if (!NMD || !NMD->getNumOperands())
2276 return;
2277
2278 OutStreamer->PushSection();
2279 OutStreamer->SwitchSection(CommandLine);
2280 OutStreamer->emitZeros(1);
2281 for (unsigned i = 0, e = NMD->getNumOperands(); i != e; ++i) {
2282 const MDNode *N = NMD->getOperand(i);
2283 assert(N->getNumOperands() == 1 &&((N->getNumOperands() == 1 && "llvm.commandline metadata entry can have only one operand"
) ? static_cast<void> (0) : __assert_fail ("N->getNumOperands() == 1 && \"llvm.commandline metadata entry can have only one operand\""
, "/build/llvm-toolchain-snapshot-12~++20210115100614+a14c36fe27f5/llvm/lib/CodeGen/AsmPrinter/AsmPrinter.cpp"
, 2284, __PRETTY_FUNCTION__))
2284 "llvm.commandline metadata entry can have only one operand")((N->getNumOperands() == 1 && "llvm.commandline metadata entry can have only one operand"
) ? static_cast<void> (0) : __assert_fail ("N->getNumOperands() == 1 && \"llvm.commandline metadata entry can have only one operand\""
, "/build/llvm-toolchain-snapshot-12~++20210115100614+a14c36fe27f5/llvm/lib/CodeGen/AsmPrinter/AsmPrinter.cpp"
, 2284, __PRETTY_FUNCTION__))
;
2285 const MDString *S = cast<MDString>(N->getOperand(0));
2286 OutStreamer->emitBytes(S->getString());
2287 OutStreamer->emitZeros(1);
2288 }
2289 OutStreamer->PopSection();
2290}
2291
2292//===--------------------------------------------------------------------===//
2293// Emission and print routines
2294//
2295
2296/// Emit a byte directive and value.
2297///
2298void AsmPrinter::emitInt8(int Value) const { OutStreamer->emitInt8(Value); }
2299
2300/// Emit a short directive and value.
2301void AsmPrinter::emitInt16(int Value) const { OutStreamer->emitInt16(Value); }
2302
2303/// Emit a long directive and value.
2304void AsmPrinter::emitInt32(int Value) const { OutStreamer->emitInt32(Value); }
2305
2306/// Emit a long long directive and value.
2307void AsmPrinter::emitInt64(uint64_t Value) const {
2308 OutStreamer->emitInt64(Value);
2309}
2310
2311/// Emit something like ".long Hi-Lo" where the size in bytes of the directive
2312/// is specified by Size and Hi/Lo specify the labels. This implicitly uses
2313/// .set if it avoids relocations.
2314void AsmPrinter::emitLabelDifference(const MCSymbol *Hi, const MCSymbol *Lo,
2315 unsigned Size) const {
2316 OutStreamer->emitAbsoluteSymbolDiff(Hi, Lo, Size);
2317}
2318
2319/// EmitLabelPlusOffset - Emit something like ".long Label+Offset"
2320/// where the size in bytes of the directive is specified by Size and Label
2321/// specifies the label. This implicitly uses .set if it is available.
2322void AsmPrinter::emitLabelPlusOffset(const MCSymbol *Label, uint64_t Offset,
2323 unsigned Size,
2324 bool IsSectionRelative) const {
2325 if (MAI->needsDwarfSectionOffsetDirective() && IsSectionRelative) {
2326 OutStreamer->EmitCOFFSecRel32(Label, Offset);
2327 if (Size > 4)
2328 OutStreamer->emitZeros(Size - 4);
2329 return;
2330 }
2331
2332 // Emit Label+Offset (or just Label if Offset is zero)
2333 const MCExpr *Expr = MCSymbolRefExpr::create(Label, OutContext);
2334 if (Offset)
2335 Expr = MCBinaryExpr::createAdd(
2336 Expr, MCConstantExpr::create(Offset, OutContext), OutContext);
2337
2338 OutStreamer->emitValue(Expr, Size);
2339}
2340
2341//===----------------------------------------------------------------------===//
2342
2343// EmitAlignment - Emit an alignment directive to the specified power of
2344// two boundary. If a global value is specified, and if that global has
2345// an explicit alignment requested, it will override the alignment request
2346// if required for correctness.
2347void AsmPrinter::emitAlignment(Align Alignment, const GlobalObject *GV) const {
2348 if (GV)
2349 Alignment = getGVAlignment(GV, GV->getParent()->getDataLayout(), Alignment);
2350
2351 if (Alignment == Align(1))
2352 return; // 1-byte aligned: no need to emit alignment.
2353
2354 if (getCurrentSection()->getKind().isText())
2355 OutStreamer->emitCodeAlignment(Alignment.value());
2356 else
2357 OutStreamer->emitValueToAlignment(Alignment.value());
2358}
2359
2360//===----------------------------------------------------------------------===//
2361// Constant emission.
2362//===----------------------------------------------------------------------===//
2363
2364const MCExpr *AsmPrinter::lowerConstant(const Constant *CV) {
2365 MCContext &Ctx = OutContext;
2366
2367 if (CV->isNullValue() || isa<UndefValue>(CV))
2368 return MCConstantExpr::create(0, Ctx);
2369
2370 if (const ConstantInt *CI = dyn_cast<ConstantInt>(CV))
2371 return MCConstantExpr::create(CI->getZExtValue(), Ctx);
2372
2373 if (const GlobalValue *GV = dyn_cast<GlobalValue>(CV))
2374 return MCSymbolRefExpr::create(getSymbol(GV), Ctx);
2375
2376 if (const BlockAddress *BA = dyn_cast<BlockAddress>(CV))
2377 return MCSymbolRefExpr::create(GetBlockAddressSymbol(BA), Ctx);
2378
2379 if (const auto *Equiv = dyn_cast<DSOLocalEquivalent>(CV))
2380 return getObjFileLowering().lowerDSOLocalEquivalent(Equiv, TM);
2381
2382 const ConstantExpr *CE = dyn_cast<ConstantExpr>(CV);
2383 if (!CE) {
2384 llvm_unreachable("Unknown constant value to lower!")::llvm::llvm_unreachable_internal("Unknown constant value to lower!"
, "/build/llvm-toolchain-snapshot-12~++20210115100614+a14c36fe27f5/llvm/lib/CodeGen/AsmPrinter/AsmPrinter.cpp"
, 2384)
;
2385 }
2386
2387 switch (CE->getOpcode()) {
2388 case Instruction::AddrSpaceCast: {
2389 const Constant *Op = CE->getOperand(0);
2390 unsigned DstAS = CE->getType()->getPointerAddressSpace();
2391 unsigned SrcAS = Op->getType()->getPointerAddressSpace();
2392 if (TM.isNoopAddrSpaceCast(SrcAS, DstAS))
2393 return lowerConstant(Op);
2394
2395 // Fallthrough to error.
2396 LLVM_FALLTHROUGH[[gnu::fallthrough]];
2397 }
2398 default: {
2399 // If the code isn't optimized, there may be outstanding folding
2400 // opportunities. Attempt to fold the expression using DataLayout as a
2401 // last resort before giving up.
2402 Constant *C = ConstantFoldConstant(CE, getDataLayout());
2403 if (C != CE)
2404 return lowerConstant(C);
2405
2406 // Otherwise report the problem to the user.
2407 std::string S;
2408 raw_string_ostream OS(S);
2409 OS << "Unsupported expression in static initializer: ";
2410 CE->printAsOperand(OS, /*PrintType=*/false,
2411 !MF ? nullptr : MF->getFunction().getParent());
2412 report_fatal_error(OS.str());
2413 }
2414 case Instruction::GetElementPtr: {
2415 // Generate a symbolic expression for the byte address
2416 APInt OffsetAI(getDataLayout().getPointerTypeSizeInBits(CE->getType()), 0);
2417 cast<GEPOperator>(CE)->accumulateConstantOffset(getDataLayout(), OffsetAI);
2418
2419 const MCExpr *Base = lowerConstant(CE->getOperand(0));
2420 if (!OffsetAI)
2421 return Base;
2422
2423 int64_t Offset = OffsetAI.getSExtValue();
2424 return MCBinaryExpr::createAdd(Base, MCConstantExpr::create(Offset, Ctx),
2425 Ctx);
2426 }
2427
2428 case Instruction::Trunc:
2429 // We emit the value and depend on the assembler to truncate the generated
2430 // expression properly. This is important for differences between
2431 // blockaddress labels. Since the two labels are in the same function, it
2432 // is reasonable to treat their delta as a 32-bit value.
2433 LLVM_FALLTHROUGH[[gnu::fallthrough]];
2434 case Instruction::BitCast:
2435 return lowerConstant(CE->getOperand(0));
2436
2437 case Instruction::IntToPtr: {
2438 const DataLayout &DL = getDataLayout();
2439
2440 // Handle casts to pointers by changing them into casts to the appropriate
2441 // integer type. This promotes constant folding and simplifies this code.
2442 Constant *Op = CE->getOperand(0);
2443 Op = ConstantExpr::getIntegerCast(Op, DL.getIntPtrType(CV->getType()),
2444 false/*ZExt*/);
2445 return lowerConstant(Op);
2446 }
2447
2448 case Instruction::PtrToInt: {
2449 const DataLayout &DL = getDataLayout();
2450
2451 // Support only foldable casts to/from pointers that can be eliminated by
2452 // changing the pointer to the appropriately sized integer type.
2453 Constant *Op = CE->getOperand(0);
2454 Type *Ty = CE->getType();
2455
2456 const MCExpr *OpExpr = lowerConstant(Op);
2457
2458 // We can emit the pointer value into this slot if the slot is an
2459 // integer slot equal to the size of the pointer.
2460 //
2461 // If the pointer is larger than the resultant integer, then
2462 // as with Trunc just depend on the assembler to truncate it.
2463 if (DL.getTypeAllocSize(Ty).getFixedSize() <=
2464 DL.getTypeAllocSize(Op->getType()).getFixedSize())
2465 return OpExpr;
2466
2467 // Otherwise the pointer is smaller than the resultant integer, mask off
2468 // the high bits so we are sure to get a proper truncation if the input is
2469 // a constant expr.
2470 unsigned InBits = DL.getTypeAllocSizeInBits(Op->getType());
2471 const MCExpr *MaskExpr = MCConstantExpr::create(~0ULL >> (64-InBits), Ctx);
2472 return MCBinaryExpr::createAnd(OpExpr, MaskExpr, Ctx);
2473 }
2474
2475 case Instruction::Sub: {
2476 GlobalValue *LHSGV;
2477 APInt LHSOffset;
2478 DSOLocalEquivalent *DSOEquiv;
2479 if (IsConstantOffsetFromGlobal(CE->getOperand(0), LHSGV, LHSOffset,
2480 getDataLayout(), &DSOEquiv)) {
2481 GlobalValue *RHSGV;
2482 APInt RHSOffset;
2483 if (IsConstantOffsetFromGlobal(CE->getOperand(1), RHSGV, RHSOffset,
2484 getDataLayout())) {
2485 const MCExpr *RelocExpr =
2486 getObjFileLowering().lowerRelativeReference(LHSGV, RHSGV, TM);
2487 if (!RelocExpr) {
2488 const MCExpr *LHSExpr =
2489 MCSymbolRefExpr::create(getSymbol(LHSGV), Ctx);
2490 if (DSOEquiv &&
2491 getObjFileLowering().supportDSOLocalEquivalentLowering())
2492 LHSExpr =
2493 getObjFileLowering().lowerDSOLocalEquivalent(DSOEquiv, TM);
2494 RelocExpr = MCBinaryExpr::createSub(
2495 LHSExpr, MCSymbolRefExpr::create(getSymbol(RHSGV), Ctx), Ctx);
2496 }
2497 int64_t Addend = (LHSOffset - RHSOffset).getSExtValue();
2498 if (Addend != 0)
2499 RelocExpr = MCBinaryExpr::createAdd(
2500 RelocExpr, MCConstantExpr::create(Addend, Ctx), Ctx);
2501 return RelocExpr;
2502 }
2503 }
2504 }
2505 // else fallthrough
2506 LLVM_FALLTHROUGH[[gnu::fallthrough]];
2507
2508 // The MC library also has a right-shift operator, but it isn't consistently
2509 // signed or unsigned between different targets.
2510 case Instruction::Add:
2511 case Instruction::Mul:
2512 case Instruction::SDiv:
2513 case Instruction::SRem:
2514 case Instruction::Shl:
2515 case Instruction::And:
2516 case Instruction::Or:
2517 case Instruction::Xor: {
2518 const MCExpr *LHS = lowerConstant(CE->getOperand(0));
2519 const MCExpr *RHS = lowerConstant(CE->getOperand(1));
2520 switch (CE->getOpcode()) {
2521 default: llvm_unreachable("Unknown binary operator constant cast expr")::llvm::llvm_unreachable_internal("Unknown binary operator constant cast expr"
, "/build/llvm-toolchain-snapshot-12~++20210115100614+a14c36fe27f5/llvm/lib/CodeGen/AsmPrinter/AsmPrinter.cpp"
, 2521)
;
2522 case Instruction::Add: return MCBinaryExpr::createAdd(LHS, RHS, Ctx);
2523 case Instruction::Sub: return MCBinaryExpr::createSub(LHS, RHS, Ctx);
2524 case Instruction::Mul: return MCBinaryExpr::createMul(LHS, RHS, Ctx);
2525 case Instruction::SDiv: return MCBinaryExpr::createDiv(LHS, RHS, Ctx);
2526 case Instruction::SRem: return MCBinaryExpr::createMod(LHS, RHS, Ctx);
2527 case Instruction::Shl: return MCBinaryExpr::createShl(LHS, RHS, Ctx);
2528 case Instruction::And: return MCBinaryExpr::createAnd(LHS, RHS, Ctx);
2529 case Instruction::Or: return MCBinaryExpr::createOr (LHS, RHS, Ctx);
2530 case Instruction::Xor: return MCBinaryExpr::createXor(LHS, RHS, Ctx);
2531 }
2532 }
2533 }
2534}
2535
2536static void emitGlobalConstantImpl(const DataLayout &DL, const Constant *C,
2537 AsmPrinter &AP,
2538 const Constant *BaseCV = nullptr,
2539 uint64_t Offset = 0);
2540
2541static void emitGlobalConstantFP(const ConstantFP *CFP, AsmPrinter &AP);
2542static void emitGlobalConstantFP(APFloat APF, Type *ET, AsmPrinter &AP);
2543
2544/// isRepeatedByteSequence - Determine whether the given value is
2545/// composed of a repeated sequence of identical bytes and return the
2546/// byte value. If it is not a repeated sequence, return -1.
2547static int isRepeatedByteSequence(const ConstantDataSequential *V) {
2548 StringRef Data = V->getRawDataValues();
2549 assert(!Data.empty() && "Empty aggregates should be CAZ node")((!Data.empty() && "Empty aggregates should be CAZ node"
) ? static_cast<void> (0) : __assert_fail ("!Data.empty() && \"Empty aggregates should be CAZ node\""
, "/build/llvm-toolchain-snapshot-12~++20210115100614+a14c36fe27f5/llvm/lib/CodeGen/AsmPrinter/AsmPrinter.cpp"
, 2549, __PRETTY_FUNCTION__))
;
2550 char C = Data[0];
2551 for (unsigned i = 1, e = Data.size(); i != e; ++i)
2552 if (Data[i] != C) return -1;
2553 return static_cast<uint8_t>(C); // Ensure 255 is not returned as -1.
2554}
2555
2556/// isRepeatedByteSequence - Determine whether the given value is
2557/// composed of a repeated sequence of identical bytes and return the
2558/// byte value. If it is not a repeated sequence, return -1.
2559static int isRepeatedByteSequence(const Value *V, const DataLayout &DL) {
2560 if (const ConstantInt *CI = dyn_cast<ConstantInt>(V)) {
2561 uint64_t Size = DL.getTypeAllocSizeInBits(V->getType());
2562 assert(Size % 8 == 0)((Size % 8 == 0) ? static_cast<void> (0) : __assert_fail
("Size % 8 == 0", "/build/llvm-toolchain-snapshot-12~++20210115100614+a14c36fe27f5/llvm/lib/CodeGen/AsmPrinter/AsmPrinter.cpp"
, 2562, __PRETTY_FUNCTION__))
;
2563
2564 // Extend the element to take zero padding into account.
2565 APInt Value = CI->getValue().zextOrSelf(Size);
2566 if (!Value.isSplat(8))
2567 return -1;
2568
2569 return Value.zextOrTrunc(8).getZExtValue();
2570 }
2571 if (const ConstantArray *CA = dyn_cast<ConstantArray>(V)) {
2572 // Make sure all array elements are sequences of the same repeated
2573 // byte.
2574 assert(CA->getNumOperands() != 0 && "Should be a CAZ")((CA->getNumOperands() != 0 && "Should be a CAZ") ?
static_cast<void> (0) : __assert_fail ("CA->getNumOperands() != 0 && \"Should be a CAZ\""
, "/build/llvm-toolchain-snapshot-12~++20210115100614+a14c36fe27f5/llvm/lib/CodeGen/AsmPrinter/AsmPrinter.cpp"
, 2574, __PRETTY_FUNCTION__))
;
2575 Constant *Op0 = CA->getOperand(0);
2576 int Byte = isRepeatedByteSequence(Op0, DL);
2577 if (Byte == -1)
2578 return -1;
2579
2580 // All array elements must be equal.
2581 for (unsigned i = 1, e = CA->getNumOperands(); i != e; ++i)
2582 if (CA->getOperand(i) != Op0)
2583 return -1;
2584 return Byte;
2585 }
2586
2587 if (const ConstantDataSequential *CDS = dyn_cast<ConstantDataSequential>(V))
2588 return isRepeatedByteSequence(CDS);
2589
2590 return -1;
2591}
2592
2593static void emitGlobalConstantDataSequential(const DataLayout &DL,
2594 const ConstantDataSequential *CDS,
2595 AsmPrinter &AP) {
2596 // See if we can aggregate this into a .fill, if so, emit it as such.
2597 int Value = isRepeatedByteSequence(CDS, DL);
2598 if (Value != -1) {
2599 uint64_t Bytes = DL.getTypeAllocSize(CDS->getType());
2600 // Don't emit a 1-byte object as a .fill.
2601 if (Bytes > 1)
2602 return AP.OutStreamer->emitFill(Bytes, Value);
2603 }
2604
2605 // If this can be emitted with .ascii/.asciz, emit it as such.
2606 if (CDS->isString())
2607 return AP.OutStreamer->emitBytes(CDS->getAsString());
2608
2609 // Otherwise, emit the values in successive locations.
2610 unsigned ElementByteSize = CDS->getElementByteSize();
2611 if (isa<IntegerType>(CDS->getElementType())) {
2612 for (unsigned i = 0, e = CDS->getNumElements(); i != e; ++i) {
2613 if (AP.isVerbose())
2614 AP.OutStreamer->GetCommentOS() << format("0x%" PRIx64"l" "x" "\n",
2615 CDS->getElementAsInteger(i));
2616 AP.OutStreamer->emitIntValue(CDS->getElementAsInteger(i),
2617 ElementByteSize);
2618 }
2619 } else {
2620 Type *ET = CDS->getElementType();
2621 for (unsigned I = 0, E = CDS->getNumElements(); I != E; ++I)
2622 emitGlobalConstantFP(CDS->getElementAsAPFloat(I), ET, AP);
2623 }
2624
2625 unsigned Size = DL.getTypeAllocSize(CDS->getType());
2626 unsigned EmittedSize =
2627 DL.getTypeAllocSize(CDS->getElementType()) * CDS->getNumElements();
2628 assert(EmittedSize <= Size && "Size cannot be less than EmittedSize!")((EmittedSize <= Size && "Size cannot be less than EmittedSize!"
) ? static_cast<void> (0) : __assert_fail ("EmittedSize <= Size && \"Size cannot be less than EmittedSize!\""
, "/build/llvm-toolchain-snapshot-12~++20210115100614+a14c36fe27f5/llvm/lib/CodeGen/AsmPrinter/AsmPrinter.cpp"
, 2628, __PRETTY_FUNCTION__))
;
2629 if (unsigned Padding = Size - EmittedSize)
2630 AP.OutStreamer->emitZeros(Padding);
2631}
2632
2633static void emitGlobalConstantArray(const DataLayout &DL,
2634 const ConstantArray *CA, AsmPrinter &AP,
2635 const Constant *BaseCV, uint64_t Offset) {
2636 // See if we can aggregate some values. Make sure it can be
2637 // represented as a series of bytes of the constant value.
2638 int Value = isRepeatedByteSequence(CA, DL);
2639
2640 if (Value != -1) {
2641 uint64_t Bytes = DL.getTypeAllocSize(CA->getType());
2642 AP.OutStreamer->emitFill(Bytes, Value);
2643 }
2644 else {
2645 for (unsigned i = 0, e = CA->getNumOperands(); i != e; ++i) {
2646 emitGlobalConstantImpl(DL, CA->getOperand(i), AP, BaseCV, Offset);
2647 Offset += DL.getTypeAllocSize(CA->getOperand(i)->getType());
2648 }
2649 }
2650}
2651
2652static void emitGlobalConstantVector(const DataLayout &DL,
2653 const ConstantVector *CV, AsmPrinter &AP) {
2654 for (unsigned i = 0, e = CV->getType()->getNumElements(); i != e; ++i)
2655 emitGlobalConstantImpl(DL, CV->getOperand(i), AP);
2656
2657 unsigned Size = DL.getTypeAllocSize(CV->getType());
2658 unsigned EmittedSize = DL.getTypeAllocSize(CV->getType()->getElementType()) *
2659 CV->getType()->getNumElements();
2660 if (unsigned Padding = Size - EmittedSize)
2661 AP.OutStreamer->emitZeros(Padding);
2662}
2663
2664static void emitGlobalConstantStruct(const DataLayout &DL,
2665 const ConstantStruct *CS, AsmPrinter &AP,
2666 const Constant *BaseCV, uint64_t Offset) {
2667 // Print the fields in successive locations. Pad to align if needed!
2668 unsigned Size = DL.getTypeAllocSize(CS->getType());
2669 const StructLayout *Layout = DL.getStructLayout(CS->getType());
2670 uint64_t SizeSoFar = 0;
2671 for (unsigned i = 0, e = CS->getNumOperands(); i != e; ++i) {
2672 const Constant *Field = CS->getOperand(i);
2673
2674 // Print the actual field value.
2675 emitGlobalConstantImpl(DL, Field, AP, BaseCV, Offset + SizeSoFar);
2676
2677 // Check if padding is needed and insert one or more 0s.
2678 uint64_t FieldSize = DL.getTypeAllocSize(Field->getType());
2679 uint64_t PadSize = ((i == e-1 ? Size : Layout->getElementOffset(i+1))
2680 - Layout->getElementOffset(i)) - FieldSize;
2681 SizeSoFar += FieldSize + PadSize;
2682
2683 // Insert padding - this may include padding to increase the size of the
2684 // current field up to the ABI size (if the struct is not packed) as well
2685 // as padding to ensure that the next field starts at the right offset.
2686 AP.OutStreamer->emitZeros(PadSize);
2687 }
2688 assert(SizeSoFar == Layout->getSizeInBytes() &&((SizeSoFar == Layout->getSizeInBytes() && "Layout of constant struct may be incorrect!"
) ? static_cast<void> (0) : __assert_fail ("SizeSoFar == Layout->getSizeInBytes() && \"Layout of constant struct may be incorrect!\""
, "/build/llvm-toolchain-snapshot-12~++20210115100614+a14c36fe27f5/llvm/lib/CodeGen/AsmPrinter/AsmPrinter.cpp"
, 2689, __PRETTY_FUNCTION__))
2689 "Layout of constant struct may be incorrect!")((SizeSoFar == Layout->getSizeInBytes() && "Layout of constant struct may be incorrect!"
) ? static_cast<void> (0) : __assert_fail ("SizeSoFar == Layout->getSizeInBytes() && \"Layout of constant struct may be incorrect!\""
, "/build/llvm-toolchain-snapshot-12~++20210115100614+a14c36fe27f5/llvm/lib/CodeGen/AsmPrinter/AsmPrinter.cpp"
, 2689, __PRETTY_FUNCTION__))
;
2690}
2691
2692static void emitGlobalConstantFP(APFloat APF, Type *ET, AsmPrinter &AP) {
2693 assert(ET && "Unknown float type")((ET && "Unknown float type") ? static_cast<void>
(0) : __assert_fail ("ET && \"Unknown float type\"",
"/build/llvm-toolchain-snapshot-12~++20210115100614+a14c36fe27f5/llvm/lib/CodeGen/AsmPrinter/AsmPrinter.cpp"
, 2693, __PRETTY_FUNCTION__))
;
2694 APInt API = APF.bitcastToAPInt();
2695
2696 // First print a comment with what we think the original floating-point value
2697 // should have been.
2698 if (AP.isVerbose()) {
2699 SmallString<8> StrVal;
2700 APF.toString(StrVal);
2701 ET->print(AP.OutStreamer->GetCommentOS());
2702 AP.OutStreamer->GetCommentOS() << ' ' << StrVal << '\n';
2703 }
2704
2705 // Now iterate through the APInt chunks, emitting them in endian-correct
2706 // order, possibly with a smaller chunk at beginning/end (e.g. for x87 80-bit
2707 // floats).
2708 unsigned NumBytes = API.getBitWidth() / 8;
2709 unsigned TrailingBytes = NumBytes % sizeof(uint64_t);
2710 const uint64_t *p = API.getRawData();
2711
2712 // PPC's long double has odd notions of endianness compared to how LLVM
2713 // handles it: p[0] goes first for *big* endian on PPC.
2714 if (AP.getDataLayout().isBigEndian() && !ET->isPPC_FP128Ty()) {
2715 int Chunk = API.getNumWords() - 1;
2716
2717 if (TrailingBytes)
2718 AP.OutStreamer->emitIntValueInHexWithPadding(p[Chunk--], TrailingBytes);
2719
2720 for (; Chunk >= 0; --Chunk)
2721 AP.OutStreamer->emitIntValueInHexWithPadding(p[Chunk], sizeof(uint64_t));
2722 } else {
2723 unsigned Chunk;
2724 for (Chunk = 0; Chunk < NumBytes / sizeof(uint64_t); ++Chunk)
2725 AP.OutStreamer->emitIntValueInHexWithPadding(p[Chunk], sizeof(uint64_t));
2726
2727 if (TrailingBytes)
2728 AP.OutStreamer->emitIntValueInHexWithPadding(p[Chunk], TrailingBytes);
2729 }
2730
2731 // Emit the tail padding for the long double.
2732 const DataLayout &DL = AP.getDataLayout();
2733 AP.OutStreamer->emitZeros(DL.getTypeAllocSize(ET) - DL.getTypeStoreSize(ET));
2734}
2735
2736static void emitGlobalConstantFP(const ConstantFP *CFP, AsmPrinter &AP) {
2737 emitGlobalConstantFP(CFP->getValueAPF(), CFP->getType(), AP);
2738}
2739
2740static void emitGlobalConstantLargeInt(const ConstantInt *CI, AsmPrinter &AP) {
2741 const DataLayout &DL = AP.getDataLayout();
2742 unsigned BitWidth = CI->getBitWidth();
2743
2744 // Copy the value as we may massage the layout for constants whose bit width
2745 // is not a multiple of 64-bits.
2746 APInt Realigned(CI->getValue());
2747 uint64_t ExtraBits = 0;
2748 unsigned ExtraBitsSize = BitWidth & 63;
2749
2750 if (ExtraBitsSize) {
2751 // The bit width of the data is not a multiple of 64-bits.
2752 // The extra bits are expected to be at the end of the chunk of the memory.
2753 // Little endian:
2754 // * Nothing to be done, just record the extra bits to emit.
2755 // Big endian:
2756 // * Record the extra bits to emit.
2757 // * Realign the raw data to emit the chunks of 64-bits.
2758 if (DL.isBigEndian()) {
2759 // Basically the structure of the raw data is a chunk of 64-bits cells:
2760 // 0 1 BitWidth / 64
2761 // [chunk1][chunk2] ... [chunkN].
2762 // The most significant chunk is chunkN and it should be emitted first.
2763 // However, due to the alignment issue chunkN contains useless bits.
2764 // Realign the chunks so that they contain only useful information:
2765 // ExtraBits 0 1 (BitWidth / 64) - 1
2766 // chu[nk1 chu][nk2 chu] ... [nkN-1 chunkN]
2767 ExtraBitsSize = alignTo(ExtraBitsSize, 8);
2768 ExtraBits = Realigned.getRawData()[0] &
2769 (((uint64_t)-1) >> (64 - ExtraBitsSize));
2770 Realigned.lshrInPlace(ExtraBitsSize);
2771 } else
2772 ExtraBits = Realigned.getRawData()[BitWidth / 64];
2773 }
2774
2775 // We don't expect assemblers to support integer data directives
2776 // for more than 64 bits, so we emit the data in at most 64-bit
2777 // quantities at a time.
2778 const uint64_t *RawData = Realigned.getRawData();
2779 for (unsigned i = 0, e = BitWidth / 64; i != e; ++i) {
2780 uint64_t Val = DL.isBigEndian() ? RawData[e - i - 1] : RawData[i];
2781 AP.OutStreamer->emitIntValue(Val, 8);
2782 }
2783
2784 if (ExtraBitsSize) {
2785 // Emit the extra bits after the 64-bits chunks.
2786
2787 // Emit a directive that fills the expected size.
2788 uint64_t Size = AP.getDataLayout().getTypeStoreSize(CI->getType());
2789 Size -= (BitWidth / 64) * 8;
2790 assert(Size && Size * 8 >= ExtraBitsSize &&((Size && Size * 8 >= ExtraBitsSize && (ExtraBits
& (((uint64_t)-1) >> (64 - ExtraBitsSize))) == ExtraBits
&& "Directive too small for extra bits.") ? static_cast
<void> (0) : __assert_fail ("Size && Size * 8 >= ExtraBitsSize && (ExtraBits & (((uint64_t)-1) >> (64 - ExtraBitsSize))) == ExtraBits && \"Directive too small for extra bits.\""
, "/build/llvm-toolchain-snapshot-12~++20210115100614+a14c36fe27f5/llvm/lib/CodeGen/AsmPrinter/AsmPrinter.cpp"
, 2792, __PRETTY_FUNCTION__))
2791 (ExtraBits & (((uint64_t)-1) >> (64 - ExtraBitsSize)))((Size && Size * 8 >= ExtraBitsSize && (ExtraBits
& (((uint64_t)-1) >> (64 - ExtraBitsSize))) == ExtraBits
&& "Directive too small for extra bits.") ? static_cast
<void> (0) : __assert_fail ("Size && Size * 8 >= ExtraBitsSize && (ExtraBits & (((uint64_t)-1) >> (64 - ExtraBitsSize))) == ExtraBits && \"Directive too small for extra bits.\""
, "/build/llvm-toolchain-snapshot-12~++20210115100614+a14c36fe27f5/llvm/lib/CodeGen/AsmPrinter/AsmPrinter.cpp"
, 2792, __PRETTY_FUNCTION__))
2792 == ExtraBits && "Directive too small for extra bits.")((Size && Size * 8 >= ExtraBitsSize && (ExtraBits
& (((uint64_t)-1) >> (64 - ExtraBitsSize))) == ExtraBits
&& "Directive too small for extra bits.") ? static_cast
<void> (0) : __assert_fail ("Size && Size * 8 >= ExtraBitsSize && (ExtraBits & (((uint64_t)-1) >> (64 - ExtraBitsSize))) == ExtraBits && \"Directive too small for extra bits.\""
, "/build/llvm-toolchain-snapshot-12~++20210115100614+a14c36fe27f5/llvm/lib/CodeGen/AsmPrinter/AsmPrinter.cpp"
, 2792, __PRETTY_FUNCTION__))
;
2793 AP.OutStreamer->emitIntValue(ExtraBits, Size);
2794 }
2795}
2796
2797/// Transform a not absolute MCExpr containing a reference to a GOT
2798/// equivalent global, by a target specific GOT pc relative access to the
2799/// final symbol.
2800static void handleIndirectSymViaGOTPCRel(AsmPrinter &AP, const MCExpr **ME,
2801 const Constant *BaseCst,
2802 uint64_t Offset) {
2803 // The global @foo below illustrates a global that uses a got equivalent.
2804 //
2805 // @bar = global i32 42
2806 // @gotequiv = private unnamed_addr constant i32* @bar
2807 // @foo = i32 trunc (i64 sub (i64 ptrtoint (i32** @gotequiv to i64),
2808 // i64 ptrtoint (i32* @foo to i64))
2809 // to i32)
2810 //
2811 // The cstexpr in @foo is converted into the MCExpr `ME`, where we actually
2812 // check whether @foo is suitable to use a GOTPCREL. `ME` is usually in the
2813 // form:
2814 //
2815 // foo = cstexpr, where
2816 // cstexpr := <gotequiv> - "." + <cst>
2817 // cstexpr := <gotequiv> - (<foo> - <offset from @foo base>) + <cst>
2818 //
2819 // After canonicalization by evaluateAsRelocatable `ME` turns into:
2820 //
2821 // cstexpr := <gotequiv> - <foo> + gotpcrelcst, where
2822 // gotpcrelcst := <offset from @foo base> + <cst>
2823 MCValue MV;
2824 if (!(*ME)->evaluateAsRelocatable(MV, nullptr, nullptr) || MV.isAbsolute())
2825 return;
2826 const MCSymbolRefExpr *SymA = MV.getSymA();
2827 if (!SymA)
2828 return;
2829
2830 // Check that GOT equivalent symbol is cached.
2831 const MCSymbol *GOTEquivSym = &SymA->getSymbol();
2832 if (!AP.GlobalGOTEquivs.count(GOTEquivSym))
2833 return;
2834
2835 const GlobalValue *BaseGV = dyn_cast_or_null<GlobalValue>(BaseCst);
2836 if (!BaseGV)
2837 return;
2838
2839 // Check for a valid base symbol
2840 const MCSymbol *BaseSym = AP.getSymbol(BaseGV);
2841 const MCSymbolRefExpr *SymB = MV.getSymB();
2842
2843 if (!SymB || BaseSym != &SymB->getSymbol())
2844 return;
2845
2846 // Make sure to match:
2847 //
2848 // gotpcrelcst := <offset from @foo base> + <cst>
2849 //
2850 // If gotpcrelcst is positive it means that we can safely fold the pc rel
2851 // displacement into the GOTPCREL. We can also can have an extra offset <cst>
2852 // if the target knows how to encode it.
2853 int64_t GOTPCRelCst = Offset + MV.getConstant();
2854 if (GOTPCRelCst < 0)
2855 return;
2856 if (!AP.getObjFileLowering().supportGOTPCRelWithOffset() && GOTPCRelCst != 0)
2857 return;
2858
2859 // Emit the GOT PC relative to replace the got equivalent global, i.e.:
2860 //
2861 // bar:
2862 // .long 42
2863 // gotequiv:
2864 // .quad bar
2865 // foo:
2866 // .long gotequiv - "." + <cst>
2867 //
2868 // is replaced by the target specific equivalent to:
2869 //
2870 // bar:
2871 // .long 42
2872 // foo:
2873 // .long bar@GOTPCREL+<gotpcrelcst>
2874 AsmPrinter::GOTEquivUsePair Result = AP.GlobalGOTEquivs[GOTEquivSym];
2875 const GlobalVariable *GV = Result.first;
2876 int NumUses = (int)Result.second;
2877 const GlobalValue *FinalGV = dyn_cast<GlobalValue>(GV->getOperand(0));
2878 const MCSymbol *FinalSym = AP.getSymbol(FinalGV);
2879 *ME = AP.getObjFileLowering().getIndirectSymViaGOTPCRel(
2880 FinalGV, FinalSym, MV, Offset, AP.MMI, *AP.OutStreamer);
2881
2882 // Update GOT equivalent usage information
2883 --NumUses;
2884 if (NumUses >= 0)
2885 AP.GlobalGOTEquivs[GOTEquivSym] = std::make_pair(GV, NumUses);
2886}
2887
2888static void emitGlobalConstantImpl(const DataLayout &DL, const Constant *CV,
2889 AsmPrinter &AP, const Constant *BaseCV,
2890 uint64_t Offset) {
2891 uint64_t Size = DL.getTypeAllocSize(CV->getType());
2892
2893 // Globals with sub-elements such as combinations of arrays and structs
2894 // are handled recursively by emitGlobalConstantImpl. Keep track of the
2895 // constant symbol base and the current position with BaseCV and Offset.
2896 if (!BaseCV && CV->hasOneUse())
2897 BaseCV = dyn_cast<Constant>(CV->user_back());
2898
2899 if (isa<ConstantAggregateZero>(CV) || isa<UndefValue>(CV))
2900 return AP.OutStreamer->emitZeros(Size);
2901
2902 if (const ConstantInt *CI = dyn_cast<ConstantInt>(CV)) {
2903 const uint64_t StoreSize = DL.getTypeStoreSize(CV->getType());
2904
2905 if (StoreSize <= 8) {
2906 if (AP.isVerbose())
2907 AP.OutStreamer->GetCommentOS() << format("0x%" PRIx64"l" "x" "\n",
2908 CI->getZExtValue());
2909 AP.OutStreamer->emitIntValue(CI->getZExtValue(), StoreSize);
2910 } else {
2911 emitGlobalConstantLargeInt(CI, AP);
2912 }
2913
2914 // Emit tail padding if needed
2915 if (Size != StoreSize)
2916 AP.OutStreamer->emitZeros(Size - StoreSize);
2917
2918 return;
2919 }
2920
2921 if (const ConstantFP *CFP = dyn_cast<ConstantFP>(CV))
2922 return emitGlobalConstantFP(CFP, AP);
2923
2924 if (isa<ConstantPointerNull>(CV)) {
2925 AP.OutStreamer->emitIntValue(0, Size);
2926 return;
2927 }
2928
2929 if (const ConstantDataSequential *CDS = dyn_cast<ConstantDataSequential>(CV))
2930 return emitGlobalConstantDataSequential(DL, CDS, AP);
2931
2932 if (const ConstantArray *CVA = dyn_cast<ConstantArray>(CV))
2933 return emitGlobalConstantArray(DL, CVA, AP, BaseCV, Offset);
2934
2935 if (const ConstantStruct *CVS = dyn_cast<ConstantStruct>(CV))
2936 return emitGlobalConstantStruct(DL, CVS, AP, BaseCV, Offset);
2937
2938 if (const ConstantExpr *CE = dyn_cast<ConstantExpr>(CV)) {
2939 // Look through bitcasts, which might not be able to be MCExpr'ized (e.g. of
2940 // vectors).
2941 if (CE->getOpcode() == Instruction::BitCast)
2942 return emitGlobalConstantImpl(DL, CE->getOperand(0), AP);
2943
2944 if (Size > 8) {
2945 // If the constant expression's size is greater than 64-bits, then we have
2946 // to emit the value in chunks. Try to constant fold the value and emit it
2947 // that way.
2948 Constant *New = ConstantFoldConstant(CE, DL);
2949 if (New != CE)
2950 return emitGlobalConstantImpl(DL, New, AP);
2951 }
2952 }
2953
2954 if (const ConstantVector *V = dyn_cast<ConstantVector>(CV))
2955 return emitGlobalConstantVector(DL, V, AP);
2956
2957 // Otherwise, it must be a ConstantExpr. Lower it to an MCExpr, then emit it
2958 // thread the streamer with EmitValue.
2959 const MCExpr *ME = AP.lowerConstant(CV);
2960
2961 // Since lowerConstant already folded and got rid of all IR pointer and
2962 // integer casts, detect GOT equivalent accesses by looking into the MCExpr
2963 // directly.
2964 if (AP.getObjFileLowering().supportIndirectSymViaGOTPCRel())
2965 handleIndirectSymViaGOTPCRel(AP, &ME, BaseCV, Offset);
2966
2967 AP.OutStreamer->emitValue(ME, Size);
2968}
2969
2970/// EmitGlobalConstant - Print a general LLVM constant to the .s file.
2971void AsmPrinter::emitGlobalConstant(const DataLayout &DL, const Constant *CV) {
2972 uint64_t Size = DL.getTypeAllocSize(CV->getType());
2973 if (Size)
2974 emitGlobalConstantImpl(DL, CV, *this);
2975 else if (MAI->hasSubsectionsViaSymbols()) {
2976 // If the global has zero size, emit a single byte so that two labels don't
2977 // look like they are at the same location.
2978 OutStreamer->emitIntValue(0, 1);
2979 }
2980}
2981
2982void AsmPrinter::emitMachineConstantPoolValue(MachineConstantPoolValue *MCPV) {
2983 // Target doesn't support this yet!
2984 llvm_unreachable("Target does not support EmitMachineConstantPoolValue")::llvm::llvm_unreachable_internal("Target does not support EmitMachineConstantPoolValue"
, "/build/llvm-toolchain-snapshot-12~++20210115100614+a14c36fe27f5/llvm/lib/CodeGen/AsmPrinter/AsmPrinter.cpp"
, 2984)
;
2985}
2986
2987void AsmPrinter::printOffset(int64_t Offset, raw_ostream &OS) const {
2988 if (Offset > 0)
2989 OS << '+' << Offset;
2990 else if (Offset < 0)
2991 OS << Offset;
2992}
2993
2994void AsmPrinter::emitNops(unsigned N) {
2995 MCInst Nop;
2996 MF->getSubtarget().getInstrInfo()->getNoop(Nop);
2997 for (; N; --N)
2998 EmitToStreamer(*OutStreamer, Nop);
2999}
3000
3001//===----------------------------------------------------------------------===//
3002// Symbol Lowering Routines.
3003//===----------------------------------------------------------------------===//
3004
3005MCSymbol *AsmPrinter::createTempSymbol(const Twine &Name) const {
3006 return OutContext.createTempSymbol(Name, true);
3007}
3008
3009MCSymbol *AsmPrinter::GetBlockAddressSymbol(const BlockAddress *BA) const {
3010 return MMI->getAddrLabelSymbol(BA->getBasicBlock());
3011}
3012
3013MCSymbol *AsmPrinter::GetBlockAddressSymbol(const BasicBlock *BB) const {
3014 return MMI->getAddrLabelSymbol(BB);
3015}
3016
3017/// GetCPISymbol - Return the symbol for the specified constant pool entry.
3018MCSymbol *AsmPrinter::GetCPISymbol(unsigned CPID) const {
3019 if (getSubtargetInfo().getTargetTriple().isWindowsMSVCEnvironment()) {
3020 const MachineConstantPoolEntry &CPE =
3021 MF->getConstantPool()->getConstants()[CPID];
3022 if (!CPE.isMachineConstantPoolEntry()) {
3023 const DataLayout &DL = MF->getDataLayout();
3024 SectionKind Kind = CPE.getSectionKind(&DL);
3025 const Constant *C = CPE.Val.ConstVal;
3026 Align Alignment = CPE.Alignment;
3027 if (const MCSectionCOFF *S = dyn_cast<MCSectionCOFF>(
3028 getObjFileLowering().getSectionForConstant(DL, Kind, C,
3029 Alignment))) {
3030 if (MCSymbol *Sym = S->getCOMDATSymbol()) {
3031 if (Sym->isUndefined())
3032 OutStreamer->emitSymbolAttribute(Sym, MCSA_Global);
3033 return Sym;
3034 }
3035 }
3036 }
3037 }
3038
3039 const DataLayout &DL = getDataLayout();
3040 return OutContext.getOrCreateSymbol(Twine(DL.getPrivateGlobalPrefix()) +
3041 "CPI" + Twine(getFunctionNumber()) + "_" +
3042 Twine(CPID));
3043}
3044
3045/// GetJTISymbol - Return the symbol for the specified jump table entry.
3046MCSymbol *AsmPrinter::GetJTISymbol(unsigned JTID, bool isLinkerPrivate) const {
3047 return MF->getJTISymbol(JTID, OutContext, isLinkerPrivate);
3048}
3049
3050/// GetJTSetSymbol - Return the symbol for the specified jump table .set
3051/// FIXME: privatize to AsmPrinter.
3052MCSymbol *AsmPrinter::GetJTSetSymbol(unsigned UID, unsigned MBBID) const {
3053 const DataLayout &DL = getDataLayout();
3054 return OutContext.getOrCreateSymbol(Twine(DL.getPrivateGlobalPrefix()) +
3055 Twine(getFunctionNumber()) + "_" +
3056 Twine(UID) + "_set_" + Twine(MBBID));
3057}
3058
3059MCSymbol *AsmPrinter::getSymbolWithGlobalValueBase(const GlobalValue *GV,
3060 StringRef Suffix) const {
3061 return getObjFileLowering().getSymbolWithGlobalValueBase(GV, Suffix, TM);
3062}
3063
3064/// Return the MCSymbol for the specified ExternalSymbol.
3065MCSymbol *AsmPrinter::GetExternalSymbolSymbol(StringRef Sym) const {
3066 SmallString<60> NameStr;
3067 Mangler::getNameWithPrefix(NameStr, Sym, getDataLayout());
3068 return OutContext.getOrCreateSymbol(NameStr);
3069}
3070
3071/// PrintParentLoopComment - Print comments about parent loops of this one.
3072static void PrintParentLoopComment(raw_ostream &OS, const MachineLoop *Loop,
3073 unsigned FunctionNumber) {
3074 if (!Loop) return;
3075 PrintParentLoopComment(OS, Loop->getParentLoop(), FunctionNumber);
3076 OS.indent(Loop->getLoopDepth()*2)
3077 << "Parent Loop BB" << FunctionNumber << "_"
3078 << Loop->getHeader()->getNumber()
3079 << " Depth=" << Loop->getLoopDepth() << '\n';
3080}
3081
3082/// PrintChildLoopComment - Print comments about child loops within
3083/// the loop for this basic block, with nesting.
3084static void PrintChildLoopComment(raw_ostream &OS, const MachineLoop *Loop,
3085 unsigned FunctionNumber) {
3086 // Add child loop information
3087 for (const MachineLoop *CL : *Loop) {
3088 OS.indent(CL->getLoopDepth()*2)
3089 << "Child Loop BB" << FunctionNumber << "_"
3090 << CL->getHeader()->getNumber() << " Depth " << CL->getLoopDepth()
3091 << '\n';
3092 PrintChildLoopComment(OS, CL, FunctionNumber);
3093 }
3094}
3095
3096/// emitBasicBlockLoopComments - Pretty-print comments for basic blocks.
3097static void emitBasicBlockLoopComments(const MachineBasicBlock &MBB,
3098 const MachineLoopInfo *LI,
3099 const AsmPrinter &AP) {
3100 // Add loop depth information
3101 const MachineLoop *Loop = LI->getLoopFor(&MBB);
3102 if (!Loop) return;
3103
3104 MachineBasicBlock *Header = Loop->getHeader();
3105 assert(Header && "No header for loop")((Header && "No header for loop") ? static_cast<void
> (0) : __assert_fail ("Header && \"No header for loop\""
, "/build/llvm-toolchain-snapshot-12~++20210115100614+a14c36fe27f5/llvm/lib/CodeGen/AsmPrinter/AsmPrinter.cpp"
, 3105, __PRETTY_FUNCTION__))
;
3106
3107 // If this block is not a loop header, just print out what is the loop header
3108 // and return.
3109 if (Header != &MBB) {
3110 AP.OutStreamer->AddComment(" in Loop: Header=BB" +
3111 Twine(AP.getFunctionNumber())+"_" +
3112 Twine(Loop->getHeader()->getNumber())+
3113 " Depth="+Twine(Loop->getLoopDepth()));
3114 return;
3115 }
3116
3117 // Otherwise, it is a loop header. Print out information about child and
3118 // parent loops.
3119 raw_ostream &OS = AP.OutStreamer->GetCommentOS();
3120
3121 PrintParentLoopComment(OS, Loop->getParentLoop(), AP.getFunctionNumber());
3122
3123 OS << "=>";
3124 OS.indent(Loop->getLoopDepth()*2-2);
3125
3126 OS << "This ";
3127 if (Loop->isInnermost())
3128 OS << "Inner ";
3129 OS << "Loop Header: Depth=" + Twine(Loop->getLoopDepth()) << '\n';
3130
3131 PrintChildLoopComment(OS, Loop, AP.getFunctionNumber());
3132}
3133
3134/// emitBasicBlockStart - This method prints the label for the specified
3135/// MachineBasicBlock, an alignment (if present) and a comment describing
3136/// it if appropriate.
3137void AsmPrinter::emitBasicBlockStart(const MachineBasicBlock &MBB) {
3138 // End the previous funclet and start a new one.
3139 if (MBB.isEHFuncletEntry()) {
3140 for (const HandlerInfo &HI : Handlers) {
3141 HI.Handler->endFunclet();
3142 HI.Handler->beginFunclet(MBB);
3143 }
3144 }
3145
3146 // Emit an alignment directive for this block, if needed.
3147 const Align Alignment = MBB.getAlignment();
3148 if (Alignment != Align(1))
3149 emitAlignment(Alignment);
3150
3151 // Switch to a new section if this basic block must begin a section. The
3152 // entry block is always placed in the function section and is handled
3153 // separately.
3154 if (MBB.isBeginSection() && !MBB.isEntryBlock()) {
3155 OutStreamer->SwitchSection(
3156 getObjFileLowering().getSectionForMachineBasicBlock(MF->getFunction(),
3157 MBB, TM));
3158 CurrentSectionBeginSym = MBB.getSymbol();
3159 }
3160
3161 // If the block has its address taken, emit any labels that were used to
3162 // reference the block. It is possible that there is more than one label
3163 // here, because multiple LLVM BB's may have been RAUW'd to this block after
3164 // the references were generated.
3165 if (MBB.hasAddressTaken()) {
3166 const BasicBlock *BB = MBB.getBasicBlock();
3167 if (isVerbose())
3168 OutStreamer->AddComment("Block address taken");
3169
3170 // MBBs can have their address taken as part of CodeGen without having
3171 // their corresponding BB's address taken in IR
3172 if (BB->hasAddressTaken())
3173 for (MCSymbol *Sym : MMI->getAddrLabelSymbolToEmit(BB))
3174 OutStreamer->emitLabel(Sym);
3175 }
3176
3177 // Print some verbose block comments.
3178 if (isVerbose()) {
3179 if (const BasicBlock *BB = MBB.getBasicBlock()) {
3180 if (BB->hasName()) {
3181 BB->printAsOperand(OutStreamer->GetCommentOS(),
3182 /*PrintType=*/false, BB->getModule());
3183 OutStreamer->GetCommentOS() << '\n';
3184 }
3185 }
3186
3187 assert(MLI != nullptr && "MachineLoopInfo should has been computed")((MLI != nullptr && "MachineLoopInfo should has been computed"
) ? static_cast<void> (0) : __assert_fail ("MLI != nullptr && \"MachineLoopInfo should has been computed\""
, "/build/llvm-toolchain-snapshot-12~++20210115100614+a14c36fe27f5/llvm/lib/CodeGen/AsmPrinter/AsmPrinter.cpp"
, 3187, __PRETTY_FUNCTION__))
;
3188 emitBasicBlockLoopComments(MBB, MLI, *this);
3189 }
3190
3191 // Print the main label for the block.
3192 if (shouldEmitLabelForBasicBlock(MBB)) {
3193 if (isVerbose() && MBB.hasLabelMustBeEmitted())
3194 OutStreamer->AddComment("Label of block must be emitted");
3195 OutStreamer->emitLabel(MBB.getSymbol());
3196 } else {
3197 if (isVerbose()) {
3198 // NOTE: Want this comment at start of line, don't emit with AddComment.
3199 OutStreamer->emitRawComment(" %bb." + Twine(MBB.getNumber()) + ":",
3200 false);
3201 }
3202 }
3203
3204 // With BB sections, each basic block must handle CFI information on its own
3205 // if it begins a section (Entry block is handled separately by
3206 // AsmPrinterHandler::beginFunction).
3207 if (MBB.isBeginSection() && !MBB.isEntryBlock())
3208 for (const HandlerInfo &HI : Handlers)
3209 HI.Handler->beginBasicBlock(MBB);
3210}
3211
3212void AsmPrinter::emitBasicBlockEnd(const MachineBasicBlock &MBB) {
3213 // Check if CFI information needs to be updated for this MBB with basic block
3214 // sections.
3215 if (MBB.isEndSection())
3216 for (const HandlerInfo &HI : Handlers)
3217 HI.Handler->endBasicBlock(MBB);
3218}
3219
3220void AsmPrinter::emitVisibility(MCSymbol *Sym, unsigned Visibility,
3221 bool IsDefinition) const {
3222 MCSymbolAttr Attr = MCSA_Invalid;
3223
3224 switch (Visibility) {
3225 default: break;
3226 case GlobalValue::HiddenVisibility:
3227 if (IsDefinition)
3228 Attr = MAI->getHiddenVisibilityAttr();
3229 else
3230 Attr = MAI->getHiddenDeclarationVisibilityAttr();
3231 break;
3232 case GlobalValue::ProtectedVisibility:
3233 Attr = MAI->getProtectedVisibilityAttr();
3234 break;
3235 }
3236
3237 if (Attr != MCSA_Invalid)
3238 OutStreamer->emitSymbolAttribute(Sym, Attr);
3239}
3240
3241bool AsmPrinter::shouldEmitLabelForBasicBlock(
3242 const MachineBasicBlock &MBB) const {
3243 // With `-fbasic-block-sections=`, a label is needed for every non-entry block
3244 // in the labels mode (option `=labels`) and every section beginning in the
3245 // sections mode (`=all` and `=list=`).
3246 if ((MF->hasBBLabels() || MBB.isBeginSection()) && !MBB.isEntryBlock())
3247 return true;
3248 // A label is needed for any block with at least one predecessor (when that
3249 // predecessor is not the fallthrough predecessor, or if it is an EH funclet
3250 // entry, or if a label is forced).
3251 return !MBB.pred_empty() &&
3252 (!isBlockOnlyReachableByFallthrough(&MBB) || MBB.isEHFuncletEntry() ||
3253 MBB.hasLabelMustBeEmitted());
3254}
3255
3256/// isBlockOnlyReachableByFallthough - Return true if the basic block has
3257/// exactly one predecessor and the control transfer mechanism between
3258/// the predecessor and this block is a fall-through.
3259bool AsmPrinter::
3260isBlockOnlyReachableByFallthrough(const MachineBasicBlock *MBB) const {
3261 // If this is a landing pad, it isn't a fall through. If it has no preds,
3262 // then nothing falls through to it.
3263 if (MBB->isEHPad() || MBB->pred_empty())
3264 return false;
3265
3266 // If there isn't exactly one predecessor, it can't be a fall through.
3267 if (MBB->pred_size() > 1)
3268 return false;
3269
3270 // The predecessor has to be immediately before this block.
3271 MachineBasicBlock *Pred = *MBB->pred_begin();
3272 if (!Pred->isLayoutSuccessor(MBB))
3273 return false;
3274
3275 // If the block is completely empty, then it definitely does fall through.
3276 if (Pred->empty())
3277 return true;
3278
3279 // Check the terminators in the previous blocks
3280 for (const auto &MI : Pred->terminators()) {
3281 // If it is not a simple branch, we are in a table somewhere.
3282 if (!MI.isBranch() || MI.isIndirectBranch())
3283 return false;
3284
3285 // If we are the operands of one of the branches, this is not a fall
3286 // through. Note that targets with delay slots will usually bundle
3287 // terminators with the delay slot instruction.
3288 for (ConstMIBundleOperands OP(MI); OP.isValid(); ++OP) {
3289 if (OP->isJTI())
3290 return false;
3291 if (OP->isMBB() && OP->getMBB() == MBB)
3292 return false;
3293 }
3294 }
3295
3296 return true;
3297}
3298
3299GCMetadataPrinter *AsmPrinter::GetOrCreateGCPrinter(GCStrategy &S) {
3300 if (!S.usesMetadata())
3301 return nullptr;
3302
3303 gcp_map_type &GCMap = getGCMap(GCMetadataPrinters);
3304 gcp_map_type::iterator GCPI = GCMap.find(&S);
3305 if (GCPI != GCMap.end())
3306 return GCPI->second.get();
3307
3308 auto Name = S.getName();
3309
3310 for (const GCMetadataPrinterRegistry::entry &GCMetaPrinter :
3311 GCMetadataPrinterRegistry::entries())
3312 if (Name == GCMetaPrinter.getName()) {
3313 std::unique_ptr<GCMetadataPrinter> GMP = GCMetaPrinter.instantiate();
3314 GMP->S = &S;
3315 auto IterBool = GCMap.insert(std::make_pair(&S, std::move(GMP)));
3316 return IterBool.first->second.get();
3317 }
3318
3319 report_fatal_error("no GCMetadataPrinter registered for GC: " + Twine(Name));
3320}
3321
3322void AsmPrinter::emitStackMaps(StackMaps &SM) {
3323 GCModuleInfo *MI = getAnalysisIfAvailable<GCModuleInfo>();
3324 assert(MI && "AsmPrinter didn't require GCModuleInfo?")((MI && "AsmPrinter didn't require GCModuleInfo?") ? static_cast
<void> (0) : __assert_fail ("MI && \"AsmPrinter didn't require GCModuleInfo?\""
, "/build/llvm-toolchain-snapshot-12~++20210115100614+a14c36fe27f5/llvm/lib/CodeGen/AsmPrinter/AsmPrinter.cpp"
, 3324, __PRETTY_FUNCTION__))
;
3325 bool NeedsDefault = false;
3326 if (MI->begin() == MI->end())
3327 // No GC strategy, use the default format.
3328 NeedsDefault = true;
3329 else
3330 for (auto &I : *MI) {
3331 if (GCMetadataPrinter *MP = GetOrCreateGCPrinter(*I))
3332 if (MP->emitStackMaps(SM, *this))
3333 continue;
3334 // The strategy doesn't have printer or doesn't emit custom stack maps.
3335 // Use the default format.
3336 NeedsDefault = true;
3337 }
3338
3339 if (NeedsDefault)
3340 SM.serializeToStackMapSection();
3341}
3342
3343/// Pin vtable to this file.
3344AsmPrinterHandler::~AsmPrinterHandler() = default;
3345
3346void AsmPrinterHandler::markFunctionEnd() {}
3347
3348// In the binary's "xray_instr_map" section, an array of these function entries
3349// describes each instrumentation point. When XRay patches your code, the index
3350// into this table will be given to your handler as a patch point identifier.
3351void AsmPrinter::XRayFunctionEntry::emit(int Bytes, MCStreamer *Out) const {
3352 auto Kind8 = static_cast<uint8_t>(Kind);
3353 Out->emitBinaryData(StringRef(reinterpret_cast<const char *>(&Kind8), 1));
3354 Out->emitBinaryData(
3355 StringRef(reinterpret_cast<const char *>(&AlwaysInstrument), 1));
3356 Out->emitBinaryData(StringRef(reinterpret_cast<const char *>(&Version), 1));
3357 auto Padding = (4 * Bytes) - ((2 * Bytes) + 3);
3358 assert(Padding >= 0 && "Instrumentation map entry > 4 * Word Size")((Padding >= 0 && "Instrumentation map entry > 4 * Word Size"
) ? static_cast<void> (0) : __assert_fail ("Padding >= 0 && \"Instrumentation map entry > 4 * Word Size\""
, "/build/llvm-toolchain-snapshot-12~++20210115100614+a14c36fe27f5/llvm/lib/CodeGen/AsmPrinter/AsmPrinter.cpp"
, 3358, __PRETTY_FUNCTION__))
;
3359 Out->emitZeros(Padding);
3360}
3361
3362void AsmPrinter::emitXRayTable() {
3363 if (Sleds.empty())
3364 return;
3365
3366 auto PrevSection = OutStreamer->getCurrentSectionOnly();
3367 const Function &F = MF->getFunction();
3368 MCSection *InstMap = nullptr;
3369 MCSection *FnSledIndex = nullptr;
3370 const Triple &TT = TM.getTargetTriple();
3371 // Use PC-relative addresses on all targets.
3372 if (TT.isOSBinFormatELF()) {
3373 auto LinkedToSym = cast<MCSymbolELF>(CurrentFnSym);
3374 auto Flags = ELF::SHF_ALLOC | ELF::SHF_LINK_ORDER;
3375 StringRef GroupName;
3376 if (F.hasComdat()) {
3377 Flags |= ELF::SHF_GROUP;
3378 GroupName = F.getComdat()->getName();
3379 }
3380 InstMap = OutContext.getELFSection("xray_instr_map", ELF::SHT_PROGBITS,
3381 Flags, 0, GroupName,
3382 MCSection::NonUniqueID, LinkedToSym);
3383
3384 if (!TM.Options.XRayOmitFunctionIndex)
3385 FnSledIndex = OutContext.getELFSection(
3386 "xray_fn_idx", ELF::SHT_PROGBITS, Flags | ELF::SHF_WRITE, 0,
3387 GroupName, MCSection::NonUniqueID, LinkedToSym);
3388 } else if (MF->getSubtarget().getTargetTriple().isOSBinFormatMachO()) {
3389 InstMap = OutContext.getMachOSection("__DATA", "xray_instr_map", 0,
3390 SectionKind::getReadOnlyWithRel());
3391 if (!TM.Options.XRayOmitFunctionIndex)
3392 FnSledIndex = OutContext.getMachOSection(
3393 "__DATA", "xray_fn_idx", 0, SectionKind::getReadOnlyWithRel());
3394 } else {
3395 llvm_unreachable("Unsupported target")::llvm::llvm_unreachable_internal("Unsupported target", "/build/llvm-toolchain-snapshot-12~++20210115100614+a14c36fe27f5/llvm/lib/CodeGen/AsmPrinter/AsmPrinter.cpp"
, 3395)
;
3396 }
3397
3398 auto WordSizeBytes = MAI->getCodePointerSize();
3399
3400 // Now we switch to the instrumentation map section. Because this is done
3401 // per-function, we are able to create an index entry that will represent the
3402 // range of sleds associated with a function.
3403 auto &Ctx = OutContext;
3404 MCSymbol *SledsStart = OutContext.createTempSymbol("xray_sleds_start", true);
3405 OutStreamer->SwitchSection(InstMap);
3406 OutStreamer->emitLabel(SledsStart);
3407 for (const auto &Sled : Sleds) {
3408 MCSymbol *Dot = Ctx.createTempSymbol();
3409 OutStreamer->emitLabel(Dot);
3410 OutStreamer->emitValueImpl(
3411 MCBinaryExpr::createSub(MCSymbolRefExpr::create(Sled.Sled, Ctx),
3412 MCSymbolRefExpr::create(Dot, Ctx), Ctx),
3413 WordSizeBytes);
3414 OutStreamer->emitValueImpl(
3415 MCBinaryExpr::createSub(
3416 MCSymbolRefExpr::create(CurrentFnBegin, Ctx),
3417 MCBinaryExpr::createAdd(MCSymbolRefExpr::create(Dot, Ctx),
3418 MCConstantExpr::create(WordSizeBytes, Ctx),
3419 Ctx),
3420 Ctx),
3421 WordSizeBytes);
3422 Sled.emit(WordSizeBytes, OutStreamer.get());
3423 }
3424 MCSymbol *SledsEnd = OutContext.createTempSymbol("xray_sleds_end", true);
3425 OutStreamer->emitLabel(SledsEnd);
3426
3427 // We then emit a single entry in the index per function. We use the symbols
3428 // that bound the instrumentation map as the range for a specific function.
3429 // Each entry here will be 2 * word size aligned, as we're writing down two
3430 // pointers. This should work for both 32-bit and 64-bit platforms.
3431 if (FnSledIndex) {
3432 OutStreamer->SwitchSection(FnSledIndex);
3433 OutStreamer->emitCodeAlignment(2 * WordSizeBytes);
3434 OutStreamer->emitSymbolValue(SledsStart, WordSizeBytes, false);
3435 OutStreamer->emitSymbolValue(SledsEnd, WordSizeBytes, false);
3436 OutStreamer->SwitchSection(PrevSection);
3437 }
3438 Sleds.clear();
3439}
3440
3441void AsmPrinter::recordSled(MCSymbol *Sled, const MachineInstr &MI,
3442 SledKind Kind, uint8_t Version) {
3443 const Function &F = MI.getMF()->getFunction();
3444 auto Attr = F.getFnAttribute("function-instrument");
3445 bool LogArgs = F.hasFnAttribute("xray-log-args");
3446 bool AlwaysInstrument =
3447 Attr.isStringAttribute() && Attr.getValueAsString() == "xray-always";
3448 if (Kind == SledKind::FUNCTION_ENTER && LogArgs)
3449 Kind = SledKind::LOG_ARGS_ENTER;
3450 Sleds.emplace_back(XRayFunctionEntry{Sled, CurrentFnSym, Kind,
3451 AlwaysInstrument, &F, Version});
3452}
3453
3454void AsmPrinter::emitPatchableFunctionEntries() {
3455 const Function &F = MF->getFunction();
3456 unsigned PatchableFunctionPrefix = 0, PatchableFunctionEntry = 0;
3457 (void)F.getFnAttribute("patchable-function-prefix")
3458 .getValueAsString()
3459 .getAsInteger(10, PatchableFunctionPrefix);
3460 (void)F.getFnAttribute("patchable-function-entry")
3461 .getValueAsString()
3462 .getAsInteger(10, PatchableFunctionEntry);
3463 if (!PatchableFunctionPrefix && !PatchableFunctionEntry)
3464 return;
3465 const unsigned PointerSize = getPointerSize();
3466 if (TM.getTargetTriple().isOSBinFormatELF()) {
3467 auto Flags = ELF::SHF_WRITE | ELF::SHF_ALLOC;
3468 const MCSymbolELF *LinkedToSym = nullptr;
3469 StringRef GroupName;
3470
3471 // GNU as < 2.35 did not support section flag 'o'. Use SHF_LINK_ORDER only
3472 // if we are using the integrated assembler.
3473 if (MAI->useIntegratedAssembler()) {
3474 Flags |= ELF::SHF_LINK_ORDER;
3475 if (F.hasComdat()) {
3476 Flags |= ELF::SHF_GROUP;
3477 GroupName = F.getComdat()->getName();
3478 }
3479 LinkedToSym = cast<MCSymbolELF>(CurrentFnSym);
3480 }
3481 OutStreamer->SwitchSection(OutContext.getELFSection(
3482 "__patchable_function_entries", ELF::SHT_PROGBITS, Flags, 0, GroupName,
3483 MCSection::NonUniqueID, LinkedToSym));
3484 emitAlignment(Align(PointerSize));
3485 OutStreamer->emitSymbolValue(CurrentPatchableFunctionEntrySym, PointerSize);
3486 }
3487}
3488
3489uint16_t AsmPrinter::getDwarfVersion() const {
3490 return OutStreamer->getContext().getDwarfVersion();
3491}
3492
3493void AsmPrinter::setDwarfVersion(uint16_t Version) {
3494 OutStreamer->getContext().setDwarfVersion(Version);
3495}
3496
3497bool AsmPrinter::isDwarf64() const {
3498 return OutStreamer->getContext().getDwarfFormat() == dwarf::DWARF64;
3499}
3500
3501unsigned int AsmPrinter::getDwarfOffsetByteSize() const {
3502 return dwarf::getDwarfOffsetByteSize(
3503 OutStreamer->getContext().getDwarfFormat());
3504}
3505
3506unsigned int AsmPrinter::getUnitLengthFieldByteSize() const {
3507 return dwarf::getUnitLengthFieldByteSize(
3508 OutStreamer->getContext().getDwarfFormat());
3509}