Bug Summary

File:build/source/llvm/tools/llc/llc.cpp
Warning:line 682, column 13
Potential leak of memory pointed to by 'MMIWP'

Annotated Source Code

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clang -cc1 -cc1 -triple x86_64-pc-linux-gnu -analyze -disable-free -clear-ast-before-backend -disable-llvm-verifier -discard-value-names -main-file-name llc.cpp -analyzer-checker=core -analyzer-checker=apiModeling -analyzer-checker=unix -analyzer-checker=deadcode -analyzer-checker=cplusplus -analyzer-checker=security.insecureAPI.UncheckedReturn -analyzer-checker=security.insecureAPI.getpw -analyzer-checker=security.insecureAPI.gets -analyzer-checker=security.insecureAPI.mktemp -analyzer-checker=security.insecureAPI.mkstemp -analyzer-checker=security.insecureAPI.vfork -analyzer-checker=nullability.NullPassedToNonnull -analyzer-checker=nullability.NullReturnedFromNonnull -analyzer-output plist -w -setup-static-analyzer -analyzer-config-compatibility-mode=true -mrelocation-model pic -pic-level 2 -mframe-pointer=none -fmath-errno -ffp-contract=on -fno-rounding-math -mconstructor-aliases -funwind-tables=2 -target-cpu x86-64 -tune-cpu generic -debugger-tuning=gdb -ffunction-sections -fdata-sections -fcoverage-compilation-dir=/build/source/build-llvm/tools/clang/stage2-bins -resource-dir /usr/lib/llvm-17/lib/clang/17 -D _DEBUG -D _GLIBCXX_ASSERTIONS -D _GNU_SOURCE -D _LIBCPP_ENABLE_ASSERTIONS -D __STDC_CONSTANT_MACROS -D __STDC_FORMAT_MACROS -D __STDC_LIMIT_MACROS -I tools/llc -I /build/source/llvm/tools/llc -I include -I /build/source/llvm/include -D _FORTIFY_SOURCE=2 -D NDEBUG -U NDEBUG -internal-isystem /usr/lib/gcc/x86_64-linux-gnu/10/../../../../include/c++/10 -internal-isystem /usr/lib/gcc/x86_64-linux-gnu/10/../../../../include/x86_64-linux-gnu/c++/10 -internal-isystem /usr/lib/gcc/x86_64-linux-gnu/10/../../../../include/c++/10/backward -internal-isystem /usr/lib/llvm-17/lib/clang/17/include -internal-isystem /usr/local/include -internal-isystem /usr/lib/gcc/x86_64-linux-gnu/10/../../../../x86_64-linux-gnu/include -internal-externc-isystem /usr/include/x86_64-linux-gnu -internal-externc-isystem /include -internal-externc-isystem /usr/include -fmacro-prefix-map=/build/source/build-llvm/tools/clang/stage2-bins=build-llvm/tools/clang/stage2-bins -fmacro-prefix-map=/build/source/= -fcoverage-prefix-map=/build/source/build-llvm/tools/clang/stage2-bins=build-llvm/tools/clang/stage2-bins -fcoverage-prefix-map=/build/source/= -source-date-epoch 1679443490 -O2 -Wno-unused-command-line-argument -Wno-unused-parameter -Wwrite-strings -Wno-missing-field-initializers -Wno-long-long -Wno-maybe-uninitialized -Wno-class-memaccess -Wno-redundant-move -Wno-pessimizing-move -Wno-noexcept-type -Wno-comment -Wno-misleading-indentation -std=c++17 -fdeprecated-macro -fdebug-compilation-dir=/build/source/build-llvm/tools/clang/stage2-bins -fdebug-prefix-map=/build/source/build-llvm/tools/clang/stage2-bins=build-llvm/tools/clang/stage2-bins -fdebug-prefix-map=/build/source/= -ferror-limit 19 -fvisibility-inlines-hidden -stack-protector 2 -fgnuc-version=4.2.1 -fcolor-diagnostics -vectorize-loops -vectorize-slp -analyzer-output=html -analyzer-config stable-report-filename=true -faddrsig -D__GCC_HAVE_DWARF2_CFI_ASM=1 -o /tmp/scan-build-2023-03-22-005342-16304-1 -x c++ /build/source/llvm/tools/llc/llc.cpp
1//===-- llc.cpp - Implement the LLVM Native Code Generator ----------------===//
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 is the llc code generator driver. It provides a convenient
10// command-line interface for generating native assembly-language code
11// or C code, given LLVM bitcode.
12//
13//===----------------------------------------------------------------------===//
14
15#include "llvm/ADT/STLExtras.h"
16#include "llvm/ADT/ScopeExit.h"
17#include "llvm/Analysis/TargetLibraryInfo.h"
18#include "llvm/CodeGen/CommandFlags.h"
19#include "llvm/CodeGen/LinkAllAsmWriterComponents.h"
20#include "llvm/CodeGen/LinkAllCodegenComponents.h"
21#include "llvm/CodeGen/MIRParser/MIRParser.h"
22#include "llvm/CodeGen/MachineFunctionPass.h"
23#include "llvm/CodeGen/MachineModuleInfo.h"
24#include "llvm/CodeGen/TargetPassConfig.h"
25#include "llvm/CodeGen/TargetSubtargetInfo.h"
26#include "llvm/IR/AutoUpgrade.h"
27#include "llvm/IR/DataLayout.h"
28#include "llvm/IR/DiagnosticInfo.h"
29#include "llvm/IR/DiagnosticPrinter.h"
30#include "llvm/IR/LLVMContext.h"
31#include "llvm/IR/LLVMRemarkStreamer.h"
32#include "llvm/IR/LegacyPassManager.h"
33#include "llvm/IR/Module.h"
34#include "llvm/IR/Verifier.h"
35#include "llvm/IRReader/IRReader.h"
36#include "llvm/InitializePasses.h"
37#include "llvm/MC/MCTargetOptionsCommandFlags.h"
38#include "llvm/MC/SubtargetFeature.h"
39#include "llvm/MC/TargetRegistry.h"
40#include "llvm/Pass.h"
41#include "llvm/Remarks/HotnessThresholdParser.h"
42#include "llvm/Support/CommandLine.h"
43#include "llvm/Support/Debug.h"
44#include "llvm/Support/FileSystem.h"
45#include "llvm/Support/FormattedStream.h"
46#include "llvm/Support/InitLLVM.h"
47#include "llvm/Support/PluginLoader.h"
48#include "llvm/Support/SourceMgr.h"
49#include "llvm/Support/TargetSelect.h"
50#include "llvm/Support/TimeProfiler.h"
51#include "llvm/Support/ToolOutputFile.h"
52#include "llvm/Support/WithColor.h"
53#include "llvm/Target/TargetLoweringObjectFile.h"
54#include "llvm/Target/TargetMachine.h"
55#include "llvm/TargetParser/Host.h"
56#include "llvm/TargetParser/Triple.h"
57#include "llvm/Transforms/Utils/Cloning.h"
58#include <memory>
59#include <optional>
60using namespace llvm;
61
62static codegen::RegisterCodeGenFlags CGF;
63
64// General options for llc. Other pass-specific options are specified
65// within the corresponding llc passes, and target-specific options
66// and back-end code generation options are specified with the target machine.
67//
68static cl::opt<std::string>
69InputFilename(cl::Positional, cl::desc("<input bitcode>"), cl::init("-"));
70
71static cl::opt<std::string>
72InputLanguage("x", cl::desc("Input language ('ir' or 'mir')"));
73
74static cl::opt<std::string>
75OutputFilename("o", cl::desc("Output filename"), cl::value_desc("filename"));
76
77static cl::opt<std::string>
78 SplitDwarfOutputFile("split-dwarf-output",
79 cl::desc(".dwo output filename"),
80 cl::value_desc("filename"));
81
82static cl::opt<unsigned>
83TimeCompilations("time-compilations", cl::Hidden, cl::init(1u),
84 cl::value_desc("N"),
85 cl::desc("Repeat compilation N times for timing"));
86
87static cl::opt<bool> TimeTrace("time-trace", cl::desc("Record time trace"));
88
89static cl::opt<unsigned> TimeTraceGranularity(
90 "time-trace-granularity",
91 cl::desc(
92 "Minimum time granularity (in microseconds) traced by time profiler"),
93 cl::init(500), cl::Hidden);
94
95static cl::opt<std::string>
96 TimeTraceFile("time-trace-file",
97 cl::desc("Specify time trace file destination"),
98 cl::value_desc("filename"));
99
100static cl::opt<std::string>
101 BinutilsVersion("binutils-version", cl::Hidden,
102 cl::desc("Produced object files can use all ELF features "
103 "supported by this binutils version and newer."
104 "If -no-integrated-as is specified, the generated "
105 "assembly will consider GNU as support."
106 "'none' means that all ELF features can be used, "
107 "regardless of binutils support"));
108
109static cl::opt<bool>
110NoIntegratedAssembler("no-integrated-as", cl::Hidden,
111 cl::desc("Disable integrated assembler"));
112
113static cl::opt<bool>
114 PreserveComments("preserve-as-comments", cl::Hidden,
115 cl::desc("Preserve Comments in outputted assembly"),
116 cl::init(true));
117
118// Determine optimization level.
119static cl::opt<char>
120 OptLevel("O",
121 cl::desc("Optimization level. [-O0, -O1, -O2, or -O3] "
122 "(default = '-O2')"),
123 cl::Prefix, cl::init('2'));
124
125static cl::opt<std::string>
126TargetTriple("mtriple", cl::desc("Override target triple for module"));
127
128static cl::opt<std::string> SplitDwarfFile(
129 "split-dwarf-file",
130 cl::desc(
131 "Specify the name of the .dwo file to encode in the DWARF output"));
132
133static cl::opt<bool> NoVerify("disable-verify", cl::Hidden,
134 cl::desc("Do not verify input module"));
135
136static cl::opt<bool> DisableSimplifyLibCalls("disable-simplify-libcalls",
137 cl::desc("Disable simplify-libcalls"));
138
139static cl::opt<bool> ShowMCEncoding("show-mc-encoding", cl::Hidden,
140 cl::desc("Show encoding in .s output"));
141
142static cl::opt<bool>
143 DwarfDirectory("dwarf-directory", cl::Hidden,
144 cl::desc("Use .file directives with an explicit directory"),
145 cl::init(true));
146
147static cl::opt<bool> AsmVerbose("asm-verbose",
148 cl::desc("Add comments to directives."),
149 cl::init(true));
150
151static cl::opt<bool>
152 CompileTwice("compile-twice", cl::Hidden,
153 cl::desc("Run everything twice, re-using the same pass "
154 "manager and verify the result is the same."),
155 cl::init(false));
156
157static cl::opt<bool> DiscardValueNames(
158 "discard-value-names",
159 cl::desc("Discard names from Value (other than GlobalValue)."),
160 cl::init(false), cl::Hidden);
161
162static cl::list<std::string> IncludeDirs("I", cl::desc("include search path"));
163
164static cl::opt<bool> RemarksWithHotness(
165 "pass-remarks-with-hotness",
166 cl::desc("With PGO, include profile count in optimization remarks"),
167 cl::Hidden);
168
169static cl::opt<std::optional<uint64_t>, false, remarks::HotnessThresholdParser>
170 RemarksHotnessThreshold(
171 "pass-remarks-hotness-threshold",
172 cl::desc("Minimum profile count required for "
173 "an optimization remark to be output. "
174 "Use 'auto' to apply the threshold from profile summary."),
175 cl::value_desc("N or 'auto'"), cl::init(0), cl::Hidden);
176
177static cl::opt<std::string>
178 RemarksFilename("pass-remarks-output",
179 cl::desc("Output filename for pass remarks"),
180 cl::value_desc("filename"));
181
182static cl::opt<std::string>
183 RemarksPasses("pass-remarks-filter",
184 cl::desc("Only record optimization remarks from passes whose "
185 "names match the given regular expression"),
186 cl::value_desc("regex"));
187
188static cl::opt<std::string> RemarksFormat(
189 "pass-remarks-format",
190 cl::desc("The format used for serializing remarks (default: YAML)"),
191 cl::value_desc("format"), cl::init("yaml"));
192
193namespace {
194
195std::vector<std::string> &getRunPassNames() {
196 static std::vector<std::string> RunPassNames;
197 return RunPassNames;
198}
199
200struct RunPassOption {
201 void operator=(const std::string &Val) const {
202 if (Val.empty())
203 return;
204 SmallVector<StringRef, 8> PassNames;
205 StringRef(Val).split(PassNames, ',', -1, false);
206 for (auto PassName : PassNames)
207 getRunPassNames().push_back(std::string(PassName));
208 }
209};
210}
211
212static RunPassOption RunPassOpt;
213
214static cl::opt<RunPassOption, true, cl::parser<std::string>> RunPass(
215 "run-pass",
216 cl::desc("Run compiler only for specified passes (comma separated list)"),
217 cl::value_desc("pass-name"), cl::location(RunPassOpt));
218
219static int compileModule(char **, LLVMContext &);
220
221[[noreturn]] static void reportError(Twine Msg, StringRef Filename = "") {
222 SmallString<256> Prefix;
223 if (!Filename.empty()) {
224 if (Filename == "-")
225 Filename = "<stdin>";
226 ("'" + Twine(Filename) + "': ").toStringRef(Prefix);
227 }
228 WithColor::error(errs(), "llc") << Prefix << Msg << "\n";
229 exit(1);
230}
231
232[[noreturn]] static void reportError(Error Err, StringRef Filename) {
233 assert(Err)(static_cast <bool> (Err) ? void (0) : __assert_fail ("Err"
, "llvm/tools/llc/llc.cpp", 233, __extension__ __PRETTY_FUNCTION__
));
234 handleAllErrors(createFileError(Filename, std::move(Err)),
235 [&](const ErrorInfoBase &EI) { reportError(EI.message()); });
236 llvm_unreachable("reportError() should not return")::llvm::llvm_unreachable_internal("reportError() should not return"
, "llvm/tools/llc/llc.cpp", 236);
237}
238
239static std::unique_ptr<ToolOutputFile> GetOutputStream(const char *TargetName,
240 Triple::OSType OS,
241 const char *ProgName) {
242 // If we don't yet have an output filename, make one.
243 if (OutputFilename.empty()) {
244 if (InputFilename == "-")
245 OutputFilename = "-";
246 else {
247 // If InputFilename ends in .bc or .ll, remove it.
248 StringRef IFN = InputFilename;
249 if (IFN.endswith(".bc") || IFN.endswith(".ll"))
250 OutputFilename = std::string(IFN.drop_back(3));
251 else if (IFN.endswith(".mir"))
252 OutputFilename = std::string(IFN.drop_back(4));
253 else
254 OutputFilename = std::string(IFN);
255
256 switch (codegen::getFileType()) {
257 case CGFT_AssemblyFile:
258 if (TargetName[0] == 'c') {
259 if (TargetName[1] == 0)
260 OutputFilename += ".cbe.c";
261 else if (TargetName[1] == 'p' && TargetName[2] == 'p')
262 OutputFilename += ".cpp";
263 else
264 OutputFilename += ".s";
265 } else
266 OutputFilename += ".s";
267 break;
268 case CGFT_ObjectFile:
269 if (OS == Triple::Win32)
270 OutputFilename += ".obj";
271 else
272 OutputFilename += ".o";
273 break;
274 case CGFT_Null:
275 OutputFilename = "-";
276 break;
277 }
278 }
279 }
280
281 // Decide if we need "binary" output.
282 bool Binary = false;
283 switch (codegen::getFileType()) {
284 case CGFT_AssemblyFile:
285 break;
286 case CGFT_ObjectFile:
287 case CGFT_Null:
288 Binary = true;
289 break;
290 }
291
292 // Open the file.
293 std::error_code EC;
294 sys::fs::OpenFlags OpenFlags = sys::fs::OF_None;
295 if (!Binary)
296 OpenFlags |= sys::fs::OF_TextWithCRLF;
297 auto FDOut = std::make_unique<ToolOutputFile>(OutputFilename, EC, OpenFlags);
298 if (EC) {
299 reportError(EC.message());
300 return nullptr;
301 }
302
303 return FDOut;
304}
305
306struct LLCDiagnosticHandler : public DiagnosticHandler {
307 bool *HasError;
308 LLCDiagnosticHandler(bool *HasErrorPtr) : HasError(HasErrorPtr) {}
309 bool handleDiagnostics(const DiagnosticInfo &DI) override {
310 if (DI.getKind() == llvm::DK_SrcMgr) {
311 const auto &DISM = cast<DiagnosticInfoSrcMgr>(DI);
312 const SMDiagnostic &SMD = DISM.getSMDiag();
313
314 if (SMD.getKind() == SourceMgr::DK_Error)
315 *HasError = true;
316
317 SMD.print(nullptr, errs());
318
319 // For testing purposes, we print the LocCookie here.
320 if (DISM.isInlineAsmDiag() && DISM.getLocCookie())
321 WithColor::note() << "!srcloc = " << DISM.getLocCookie() << "\n";
322
323 return true;
324 }
325
326 if (DI.getSeverity() == DS_Error)
327 *HasError = true;
328
329 if (auto *Remark = dyn_cast<DiagnosticInfoOptimizationBase>(&DI))
330 if (!Remark->isEnabled())
331 return true;
332
333 DiagnosticPrinterRawOStream DP(errs());
334 errs() << LLVMContext::getDiagnosticMessagePrefix(DI.getSeverity()) << ": ";
335 DI.print(DP);
336 errs() << "\n";
337 return true;
338 }
339};
340
341// main - Entry point for the llc compiler.
342//
343int main(int argc, char **argv) {
344 InitLLVM X(argc, argv);
345
346 // Enable debug stream buffering.
347 EnableDebugBuffering = true;
348
349 // Initialize targets first, so that --version shows registered targets.
350 InitializeAllTargets();
351 InitializeAllTargetMCs();
352 InitializeAllAsmPrinters();
353 InitializeAllAsmParsers();
354
355 // Initialize codegen and IR passes used by llc so that the -print-after,
356 // -print-before, and -stop-after options work.
357 PassRegistry *Registry = PassRegistry::getPassRegistry();
358 initializeCore(*Registry);
359 initializeCodeGen(*Registry);
360 initializeLoopStrengthReducePass(*Registry);
361 initializeLowerIntrinsicsPass(*Registry);
362 initializeUnreachableBlockElimLegacyPassPass(*Registry);
363 initializeConstantHoistingLegacyPassPass(*Registry);
364 initializeScalarOpts(*Registry);
365 initializeVectorization(*Registry);
366 initializeScalarizeMaskedMemIntrinLegacyPassPass(*Registry);
367 initializeExpandReductionsPass(*Registry);
368 initializeExpandVectorPredicationPass(*Registry);
369 initializeHardwareLoopsLegacyPass(*Registry);
370 initializeTransformUtils(*Registry);
371 initializeReplaceWithVeclibLegacyPass(*Registry);
372 initializeTLSVariableHoistLegacyPassPass(*Registry);
373
374 // Initialize debugging passes.
375 initializeScavengerTestPass(*Registry);
376
377 // Register the Target and CPU printer for --version.
378 cl::AddExtraVersionPrinter(sys::printDefaultTargetAndDetectedCPU);
379 // Register the target printer for --version.
380 cl::AddExtraVersionPrinter(TargetRegistry::printRegisteredTargetsForVersion);
381
382 cl::ParseCommandLineOptions(argc, argv, "llvm system compiler\n");
383
384 if (TimeTrace)
385 timeTraceProfilerInitialize(TimeTraceGranularity, argv[0]);
386 auto TimeTraceScopeExit = make_scope_exit([]() {
387 if (TimeTrace) {
388 if (auto E = timeTraceProfilerWrite(TimeTraceFile, OutputFilename)) {
389 handleAllErrors(std::move(E), [&](const StringError &SE) {
390 errs() << SE.getMessage() << "\n";
391 });
392 return;
393 }
394 timeTraceProfilerCleanup();
395 }
396 });
397
398 LLVMContext Context;
399 Context.setDiscardValueNames(DiscardValueNames);
400
401 // Set a diagnostic handler that doesn't exit on the first error
402 bool HasError = false;
403 Context.setDiagnosticHandler(
404 std::make_unique<LLCDiagnosticHandler>(&HasError));
405
406 Expected<std::unique_ptr<ToolOutputFile>> RemarksFileOrErr =
407 setupLLVMOptimizationRemarks(Context, RemarksFilename, RemarksPasses,
408 RemarksFormat, RemarksWithHotness,
409 RemarksHotnessThreshold);
410 if (Error E = RemarksFileOrErr.takeError())
411 reportError(std::move(E), RemarksFilename);
412 std::unique_ptr<ToolOutputFile> RemarksFile = std::move(*RemarksFileOrErr);
413
414 if (InputLanguage != "" && InputLanguage != "ir" && InputLanguage != "mir")
415 reportError("input language must be '', 'IR' or 'MIR'");
416
417 // Compile the module TimeCompilations times to give better compile time
418 // metrics.
419 for (unsigned I = TimeCompilations; I; --I)
420 if (int RetVal = compileModule(argv, Context))
421 return RetVal;
422
423 if (RemarksFile)
424 RemarksFile->keep();
425 return 0;
426}
427
428static bool addPass(PassManagerBase &PM, const char *argv0,
429 StringRef PassName, TargetPassConfig &TPC) {
430 if (PassName == "none")
431 return false;
432
433 const PassRegistry *PR = PassRegistry::getPassRegistry();
434 const PassInfo *PI = PR->getPassInfo(PassName);
435 if (!PI) {
436 WithColor::error(errs(), argv0)
437 << "run-pass " << PassName << " is not registered.\n";
438 return true;
439 }
440
441 Pass *P;
442 if (PI->getNormalCtor())
443 P = PI->getNormalCtor()();
444 else {
445 WithColor::error(errs(), argv0)
446 << "cannot create pass: " << PI->getPassName() << "\n";
447 return true;
448 }
449 std::string Banner = std::string("After ") + std::string(P->getPassName());
450 TPC.addMachinePrePasses();
451 PM.add(P);
452 TPC.addMachinePostPasses(Banner);
453
454 return false;
455}
456
457static int compileModule(char **argv, LLVMContext &Context) {
458 // Load the module to be compiled...
459 SMDiagnostic Err;
460 std::unique_ptr<Module> M;
461 std::unique_ptr<MIRParser> MIR;
462 Triple TheTriple;
463 std::string CPUStr = codegen::getCPUStr(),
464 FeaturesStr = codegen::getFeaturesStr();
465
466 // Set attributes on functions as loaded from MIR from command line arguments.
467 auto setMIRFunctionAttributes = [&CPUStr, &FeaturesStr](Function &F) {
468 codegen::setFunctionAttributes(CPUStr, FeaturesStr, F);
469 };
470
471 auto MAttrs = codegen::getMAttrs();
472 bool SkipModule =
473 CPUStr == "help" || (!MAttrs.empty() && MAttrs.front() == "help");
1
Assuming the condition is false
→
474
475 CodeGenOpt::Level OLvl;
476 if (auto Level = CodeGenOpt::parseLevel(OptLevel)) {
2
←
Taking true branch
→
477 OLvl = *Level;
478 } else {
479 WithColor::error(errs(), argv[0]) << "invalid optimization level.\n";
480 return 1;
481 }
482
483 // Parse 'none' or '$major.$minor'. Disallow -binutils-version=0 because we
484 // use that to indicate the MC default.
485 if (!BinutilsVersion.empty() && BinutilsVersion != "none") {
3
←
Assuming the condition is false
→
486 StringRef V = BinutilsVersion.getValue();
487 unsigned Num;
488 if (V.consumeInteger(10, Num) || Num == 0 ||
489 !(V.empty() ||
490 (V.consume_front(".") && !V.consumeInteger(10, Num) && V.empty()))) {
491 WithColor::error(errs(), argv[0])
492 << "invalid -binutils-version, accepting 'none' or major.minor\n";
493 return 1;
494 }
495 }
496 TargetOptions Options;
497 auto InitializeOptions = [&](const Triple &TheTriple) {
498 Options = codegen::InitTargetOptionsFromCodeGenFlags(TheTriple);
499 Options.BinutilsVersion =
500 TargetMachine::parseBinutilsVersion(BinutilsVersion);
501 Options.DisableIntegratedAS = NoIntegratedAssembler;
502 Options.MCOptions.ShowMCEncoding = ShowMCEncoding;
503 Options.MCOptions.AsmVerbose = AsmVerbose;
504 Options.MCOptions.PreserveAsmComments = PreserveComments;
505 Options.MCOptions.IASSearchPaths = IncludeDirs;
506 Options.MCOptions.SplitDwarfFile = SplitDwarfFile;
507 if (DwarfDirectory.getPosition()) {
508 Options.MCOptions.MCUseDwarfDirectory =
509 DwarfDirectory ? MCTargetOptions::EnableDwarfDirectory
510 : MCTargetOptions::DisableDwarfDirectory;
511 } else {
512 // -dwarf-directory is not set explicitly. Some assemblers
513 // (e.g. GNU as or ptxas) do not support `.file directory'
514 // syntax prior to DWARFv5. Let the target decide the default
515 // value.
516 Options.MCOptions.MCUseDwarfDirectory =
517 MCTargetOptions::DefaultDwarfDirectory;
518 }
519 };
520
521 std::optional<Reloc::Model> RM = codegen::getExplicitRelocModel();
522 std::optional<CodeModel::Model> CM = codegen::getExplicitCodeModel();
523
524 const Target *TheTarget = nullptr;
525 std::unique_ptr<TargetMachine> Target;
526
527 // If user just wants to list available options, skip module loading
528 if (!SkipModule
3.1
'SkipModule' is false
) {
4
←
Taking true branch
→
529 auto SetDataLayout = [&](StringRef DataLayoutTargetTriple,
530 StringRef OldDLStr) -> std::optional<std::string> {
531 // If we are supposed to override the target triple, do so now.
532 std::string IRTargetTriple = DataLayoutTargetTriple.str();
533 if (!TargetTriple.empty())
534 IRTargetTriple = Triple::normalize(TargetTriple);
535 TheTriple = Triple(IRTargetTriple);
536 if (TheTriple.getTriple().empty())
537 TheTriple.setTriple(sys::getDefaultTargetTriple());
538
539 std::string Error;
540 TheTarget =
541 TargetRegistry::lookupTarget(codegen::getMArch(), TheTriple, Error);
542 if (!TheTarget) {
543 WithColor::error(errs(), argv[0]) << Error;
544 exit(1);
545 }
546
547 // On AIX, setting the relocation model to anything other than PIC is
548 // considered a user error.
549 if (TheTriple.isOSAIX() && RM && *RM != Reloc::PIC_)
550 reportError("invalid relocation model, AIX only supports PIC",
551 InputFilename);
552
553 InitializeOptions(TheTriple);
554 Target = std::unique_ptr<TargetMachine>(TheTarget->createTargetMachine(
555 TheTriple.getTriple(), CPUStr, FeaturesStr, Options, RM, CM, OLvl));
556 assert(Target && "Could not allocate target machine!")(static_cast <bool> (Target && "Could not allocate target machine!"
) ? void (0) : __assert_fail ("Target && \"Could not allocate target machine!\""
, "llvm/tools/llc/llc.cpp", 556, __extension__ __PRETTY_FUNCTION__
));
557
558 return Target->createDataLayout().getStringRepresentation();
559 };
560 if (InputLanguage == "mir" ||
5
←
Taking false branch
→
561 (InputLanguage == "" && StringRef(InputFilename).endswith(".mir"))) {
562 MIR = createMIRParserFromFile(InputFilename, Err, Context,
563 setMIRFunctionAttributes);
564 if (MIR)
565 M = MIR->parseIRModule(SetDataLayout);
566 } else {
567 M = parseIRFile(InputFilename, Err, Context,
568 ParserCallbacks(SetDataLayout));
569 }
570 if (!M) {
6
←
Taking false branch
→
571 Err.print(argv[0], WithColor::error(errs(), argv[0]));
572 return 1;
573 }
574 if (!TargetTriple.empty())
7
←
Assuming the condition is false
→
8
←
Taking false branch
→
575 M->setTargetTriple(Triple::normalize(TargetTriple));
576
577 std::optional<CodeModel::Model> CM_IR = M->getCodeModel();
578 if (!CM && CM_IR)
9
←
Assuming the condition is false
→
579 Target->setCodeModel(*CM_IR);
580 } else {
581 TheTriple = Triple(Triple::normalize(TargetTriple));
582 if (TheTriple.getTriple().empty())
583 TheTriple.setTriple(sys::getDefaultTargetTriple());
584
585 // Get the target specific parser.
586 std::string Error;
587 TheTarget =
588 TargetRegistry::lookupTarget(codegen::getMArch(), TheTriple, Error);
589 if (!TheTarget) {
590 WithColor::error(errs(), argv[0]) << Error;
591 return 1;
592 }
593
594 // On AIX, setting the relocation model to anything other than PIC is
595 // considered a user error.
596 if (TheTriple.isOSAIX() && RM && *RM != Reloc::PIC_) {
597 WithColor::error(errs(), argv[0])
598 << "invalid relocation model, AIX only supports PIC.\n";
599 return 1;
600 }
601
602 InitializeOptions(TheTriple);
603 Target = std::unique_ptr<TargetMachine>(TheTarget->createTargetMachine(
604 TheTriple.getTriple(), CPUStr, FeaturesStr, Options, RM, CM, OLvl));
605 assert(Target && "Could not allocate target machine!")(static_cast <bool> (Target && "Could not allocate target machine!"
) ? void (0) : __assert_fail ("Target && \"Could not allocate target machine!\""
, "llvm/tools/llc/llc.cpp", 605, __extension__ __PRETTY_FUNCTION__
));
606
607 // If we don't have a module then just exit now. We do this down
608 // here since the CPU/Feature help is underneath the target machine
609 // creation.
610 return 0;
611 }
612
613 assert(M && "Should have exited if we didn't have a module!")(static_cast <bool> (M && "Should have exited if we didn't have a module!"
) ? void (0) : __assert_fail ("M && \"Should have exited if we didn't have a module!\""
, "llvm/tools/llc/llc.cpp", 613, __extension__ __PRETTY_FUNCTION__
));
10
←
'?' condition is true
→
614 if (codegen::getFloatABIForCalls() != FloatABI::Default)
11
←
Assuming the condition is false
→
12
←
Taking false branch
→
615 Options.FloatABIType = codegen::getFloatABIForCalls();
616
617 // Figure out where we are going to send the output.
618 std::unique_ptr<ToolOutputFile> Out =
619 GetOutputStream(TheTarget->getName(), TheTriple.getOS(), argv[0]);
620 if (!Out) return 1;
13
←
Taking false branch
→
621
622 // Ensure the filename is passed down to CodeViewDebug.
623 Target->Options.ObjectFilenameForDebug = Out->outputFilename();
624
625 std::unique_ptr<ToolOutputFile> DwoOut;
626 if (!SplitDwarfOutputFile.empty()) {
14
←
Assuming the condition is false
→
15
←
Taking false branch
→
627 std::error_code EC;
628 DwoOut = std::make_unique<ToolOutputFile>(SplitDwarfOutputFile, EC,
629 sys::fs::OF_None);
630 if (EC)
631 reportError(EC.message(), SplitDwarfOutputFile);
632 }
633
634 // Build up all of the passes that we want to do to the module.
635 legacy::PassManager PM;
636
637 // Add an appropriate TargetLibraryInfo pass for the module's triple.
638 TargetLibraryInfoImpl TLII(Triple(M->getTargetTriple()));
639
640 // The -disable-simplify-libcalls flag actually disables all builtin optzns.
641 if (DisableSimplifyLibCalls)
16
←
Assuming the condition is false
→
17
←
Taking false branch
→
642 TLII.disableAllFunctions();
643 PM.add(new TargetLibraryInfoWrapperPass(TLII));
644
645 // Verify module immediately to catch problems before doInitialization() is
646 // called on any passes.
647 if (!NoVerify && verifyModule(*M, &errs()))
18
←
Assuming the condition is false
→
648 reportError("input module cannot be verified", InputFilename);
649
650 // Override function attributes based on CPUStr, FeaturesStr, and command line
651 // flags.
652 codegen::setFunctionAttributes(CPUStr, FeaturesStr, *M);
653
654 if (mc::getExplicitRelaxAll() && codegen::getFileType() != CGFT_ObjectFile)
19
←
Assuming the condition is false
→
20
←
Taking false branch
→
655 WithColor::warning(errs(), argv[0])
656 << ": warning: ignoring -mc-relax-all because filetype != obj";
657
658 {
659 raw_pwrite_stream *OS = &Out->os();
660
661 // Manually do the buffering rather than using buffer_ostream,
662 // so we can memcmp the contents in CompileTwice mode
663 SmallVector<char, 0> Buffer;
664 std::unique_ptr<raw_svector_ostream> BOS;
665 if ((codegen::getFileType() != CGFT_AssemblyFile &&
21
←
Assuming the condition is false
→
23
←
Taking false branch
→
666 !Out->os().supportsSeeking()) ||
667 CompileTwice) {
22
←
Assuming the condition is false
→
668 BOS = std::make_unique<raw_svector_ostream>(Buffer);
669 OS = BOS.get();
670 }
671
672 const char *argv0 = argv[0];
673 LLVMTargetMachine &LLVMTM = static_cast<LLVMTargetMachine &>(*Target);
674 MachineModuleInfoWrapperPass *MMIWP =
675 new MachineModuleInfoWrapperPass(&LLVMTM);
24
←
Memory is allocated
→
676
677 // Construct a custom pass pipeline that starts after instruction
678 // selection.
679 if (!getRunPassNames().empty()) {
25
←
Assuming the condition is true
→
26
←
Taking true branch
→
680 if (!MIR) {
27
←
Taking true branch
→
681 WithColor::warning(errs(), argv[0])
682 << "run-pass is for .mir file only.\n";
28
←
Potential leak of memory pointed to by 'MMIWP'
683 return 1;
684 }
685 TargetPassConfig &TPC = *LLVMTM.createPassConfig(PM);
686 if (TPC.hasLimitedCodeGenPipeline()) {
687 WithColor::warning(errs(), argv[0])
688 << "run-pass cannot be used with "
689 << TPC.getLimitedCodeGenPipelineReason(" and ") << ".\n";
690 return 1;
691 }
692
693 TPC.setDisableVerify(NoVerify);
694 PM.add(&TPC);
695 PM.add(MMIWP);
696 TPC.printAndVerify("");
697 for (const std::string &RunPassName : getRunPassNames()) {
698 if (addPass(PM, argv0, RunPassName, TPC))
699 return 1;
700 }
701 TPC.setInitialized();
702 PM.add(createPrintMIRPass(*OS));
703 PM.add(createFreeMachineFunctionPass());
704 } else if (Target->addPassesToEmitFile(
705 PM, *OS, DwoOut ? &DwoOut->os() : nullptr,
706 codegen::getFileType(), NoVerify, MMIWP)) {
707 reportError("target does not support generation of this file type");
708 }
709
710 const_cast<TargetLoweringObjectFile *>(LLVMTM.getObjFileLowering())
711 ->Initialize(MMIWP->getMMI().getContext(), *Target);
712 if (MIR) {
713 assert(MMIWP && "Forgot to create MMIWP?")(static_cast <bool> (MMIWP && "Forgot to create MMIWP?"
) ? void (0) : __assert_fail ("MMIWP && \"Forgot to create MMIWP?\""
, "llvm/tools/llc/llc.cpp", 713, __extension__ __PRETTY_FUNCTION__
));
714 if (MIR->parseMachineFunctions(*M, MMIWP->getMMI()))
715 return 1;
716 }
717
718 // Before executing passes, print the final values of the LLVM options.
719 cl::PrintOptionValues();
720
721 // If requested, run the pass manager over the same module again,
722 // to catch any bugs due to persistent state in the passes. Note that
723 // opt has the same functionality, so it may be worth abstracting this out
724 // in the future.
725 SmallVector<char, 0> CompileTwiceBuffer;
726 if (CompileTwice) {
727 std::unique_ptr<Module> M2(llvm::CloneModule(*M));
728 PM.run(*M2);
729 CompileTwiceBuffer = Buffer;
730 Buffer.clear();
731 }
732
733 PM.run(*M);
734
735 auto HasError =
736 ((const LLCDiagnosticHandler *)(Context.getDiagHandlerPtr()))->HasError;
737 if (*HasError)
738 return 1;
739
740 // Compare the two outputs and make sure they're the same
741 if (CompileTwice) {
742 if (Buffer.size() != CompileTwiceBuffer.size() ||
743 (memcmp(Buffer.data(), CompileTwiceBuffer.data(), Buffer.size()) !=
744 0)) {
745 errs()
746 << "Running the pass manager twice changed the output.\n"
747 "Writing the result of the second run to the specified output\n"
748 "To generate the one-run comparison binary, just run without\n"
749 "the compile-twice option\n";
750 Out->os() << Buffer;
751 Out->keep();
752 return 1;
753 }
754 }
755
756 if (BOS) {
757 Out->os() << Buffer;
758 }
759 }
760
761 // Declare success.
762 Out->keep();
763 if (DwoOut)
764 DwoOut->keep();
765
766 return 0;
767}