Bug Summary

File:tools/clang/lib/CodeGen/CodeGenAction.cpp
Location:line 477, column 5
Description:Function call argument is an uninitialized value

Annotated Source Code

1//===--- CodeGenAction.cpp - LLVM Code Generation Frontend Action ---------===//
2//
3// The LLVM Compiler Infrastructure
4//
5// This file is distributed under the University of Illinois Open Source
6// License. See LICENSE.TXT for details.
7//
8//===----------------------------------------------------------------------===//
9
10#include "CoverageMappingGen.h"
11#include "clang/AST/ASTConsumer.h"
12#include "clang/AST/ASTContext.h"
13#include "clang/AST/DeclCXX.h"
14#include "clang/AST/DeclGroup.h"
15#include "clang/Basic/FileManager.h"
16#include "clang/Basic/SourceManager.h"
17#include "clang/Basic/TargetInfo.h"
18#include "clang/CodeGen/BackendUtil.h"
19#include "clang/CodeGen/CodeGenAction.h"
20#include "clang/CodeGen/ModuleBuilder.h"
21#include "clang/Frontend/CompilerInstance.h"
22#include "clang/Frontend/FrontendDiagnostic.h"
23#include "clang/Lex/Preprocessor.h"
24#include "llvm/ADT/SmallString.h"
25#include "llvm/Bitcode/ReaderWriter.h"
26#include "llvm/IR/DebugInfo.h"
27#include "llvm/IR/DiagnosticInfo.h"
28#include "llvm/IR/DiagnosticPrinter.h"
29#include "llvm/IR/LLVMContext.h"
30#include "llvm/IR/Module.h"
31#include "llvm/IRReader/IRReader.h"
32#include "llvm/Linker/Linker.h"
33#include "llvm/Pass.h"
34#include "llvm/Support/MemoryBuffer.h"
35#include "llvm/Support/SourceMgr.h"
36#include "llvm/Support/Timer.h"
37#include <memory>
38using namespace clang;
39using namespace llvm;
40
41namespace clang {
42 class BackendConsumer : public ASTConsumer {
43 virtual void anchor();
44 DiagnosticsEngine &Diags;
45 BackendAction Action;
46 const CodeGenOptions &CodeGenOpts;
47 const TargetOptions &TargetOpts;
48 const LangOptions &LangOpts;
49 raw_pwrite_stream *AsmOutStream;
50 ASTContext *Context;
51
52 Timer LLVMIRGeneration;
53
54 std::unique_ptr<CodeGenerator> Gen;
55
56 std::unique_ptr<llvm::Module> TheModule;
57 SmallVector<std::pair<unsigned, std::unique_ptr<llvm::Module>>, 4>
58 LinkModules;
59
60 // This is here so that the diagnostic printer knows the module a diagnostic
61 // refers to.
62 llvm::Module *CurLinkModule = nullptr;
63
64 public:
65 BackendConsumer(
66 BackendAction Action, DiagnosticsEngine &Diags,
67 const HeaderSearchOptions &HeaderSearchOpts,
68 const PreprocessorOptions &PPOpts, const CodeGenOptions &CodeGenOpts,
69 const TargetOptions &TargetOpts, const LangOptions &LangOpts,
70 bool TimePasses, const std::string &InFile,
71 const SmallVectorImpl<std::pair<unsigned, llvm::Module *>> &LinkModules,
72 raw_pwrite_stream *OS, LLVMContext &C,
73 CoverageSourceInfo *CoverageInfo = nullptr)
74 : Diags(Diags), Action(Action), CodeGenOpts(CodeGenOpts),
75 TargetOpts(TargetOpts), LangOpts(LangOpts), AsmOutStream(OS),
76 Context(nullptr), LLVMIRGeneration("LLVM IR Generation Time"),
77 Gen(CreateLLVMCodeGen(Diags, InFile, HeaderSearchOpts, PPOpts,
78 CodeGenOpts, C, CoverageInfo)) {
79 llvm::TimePassesIsEnabled = TimePasses;
80 for (auto &I : LinkModules)
81 this->LinkModules.push_back(
82 std::make_pair(I.first, std::unique_ptr<llvm::Module>(I.second)));
83 }
84 std::unique_ptr<llvm::Module> takeModule() { return std::move(TheModule); }
85 void releaseLinkModules() {
86 for (auto &I : LinkModules)
87 I.second.release();
88 }
89
90 void HandleCXXStaticMemberVarInstantiation(VarDecl *VD) override {
91 Gen->HandleCXXStaticMemberVarInstantiation(VD);
92 }
93
94 void Initialize(ASTContext &Ctx) override {
95 assert(!Context && "initialized multiple times")((!Context && "initialized multiple times") ? static_cast
<void> (0) : __assert_fail ("!Context && \"initialized multiple times\""
, "/tmp/buildd/llvm-toolchain-snapshot-3.8~svn257205/tools/clang/lib/CodeGen/CodeGenAction.cpp"
, 95, __PRETTY_FUNCTION__));
96
97 Context = &Ctx;
98
99 if (llvm::TimePassesIsEnabled)
100 LLVMIRGeneration.startTimer();
101
102 Gen->Initialize(Ctx);
103
104 TheModule.reset(Gen->GetModule());
105
106 if (llvm::TimePassesIsEnabled)
107 LLVMIRGeneration.stopTimer();
108 }
109
110 bool HandleTopLevelDecl(DeclGroupRef D) override {
111 PrettyStackTraceDecl CrashInfo(*D.begin(), SourceLocation(),
112 Context->getSourceManager(),
113 "LLVM IR generation of declaration");
114
115 if (llvm::TimePassesIsEnabled)
116 LLVMIRGeneration.startTimer();
117
118 Gen->HandleTopLevelDecl(D);
119
120 if (llvm::TimePassesIsEnabled)
121 LLVMIRGeneration.stopTimer();
122
123 return true;
124 }
125
126 void HandleInlineMethodDefinition(CXXMethodDecl *D) override {
127 PrettyStackTraceDecl CrashInfo(D, SourceLocation(),
128 Context->getSourceManager(),
129 "LLVM IR generation of inline method");
130 if (llvm::TimePassesIsEnabled)
131 LLVMIRGeneration.startTimer();
132
133 Gen->HandleInlineMethodDefinition(D);
134
135 if (llvm::TimePassesIsEnabled)
136 LLVMIRGeneration.stopTimer();
137 }
138
139 void HandleTranslationUnit(ASTContext &C) override {
140 {
141 PrettyStackTraceString CrashInfo("Per-file LLVM IR generation");
142 if (llvm::TimePassesIsEnabled)
143 LLVMIRGeneration.startTimer();
144
145 Gen->HandleTranslationUnit(C);
146
147 if (llvm::TimePassesIsEnabled)
148 LLVMIRGeneration.stopTimer();
149 }
150
151 // Silently ignore if we weren't initialized for some reason.
152 if (!TheModule)
153 return;
154
155 // Make sure IR generation is happy with the module. This is released by
156 // the module provider.
157 llvm::Module *M = Gen->ReleaseModule();
158 if (!M) {
159 // The module has been released by IR gen on failures, do not double
160 // free.
161 TheModule.release();
162 return;
163 }
164
165 assert(TheModule.get() == M &&((TheModule.get() == M && "Unexpected module change during IR generation"
) ? static_cast<void> (0) : __assert_fail ("TheModule.get() == M && \"Unexpected module change during IR generation\""
, "/tmp/buildd/llvm-toolchain-snapshot-3.8~svn257205/tools/clang/lib/CodeGen/CodeGenAction.cpp"
, 166, __PRETTY_FUNCTION__))
166 "Unexpected module change during IR generation")((TheModule.get() == M && "Unexpected module change during IR generation"
) ? static_cast<void> (0) : __assert_fail ("TheModule.get() == M && \"Unexpected module change during IR generation\""
, "/tmp/buildd/llvm-toolchain-snapshot-3.8~svn257205/tools/clang/lib/CodeGen/CodeGenAction.cpp"
, 166, __PRETTY_FUNCTION__));
167
168 // Install an inline asm handler so that diagnostics get printed through
169 // our diagnostics hooks.
170 LLVMContext &Ctx = TheModule->getContext();
171 LLVMContext::InlineAsmDiagHandlerTy OldHandler =
172 Ctx.getInlineAsmDiagnosticHandler();
173 void *OldContext = Ctx.getInlineAsmDiagnosticContext();
174 Ctx.setInlineAsmDiagnosticHandler(InlineAsmDiagHandler, this);
175
176 LLVMContext::DiagnosticHandlerTy OldDiagnosticHandler =
177 Ctx.getDiagnosticHandler();
178 void *OldDiagnosticContext = Ctx.getDiagnosticContext();
179 Ctx.setDiagnosticHandler(DiagnosticHandler, this);
180
181 // Link LinkModule into this module if present, preserving its validity.
182 for (auto &I : LinkModules) {
183 unsigned LinkFlags = I.first;
184 CurLinkModule = I.second.get();
185 if (Linker::linkModules(*M, std::move(I.second), LinkFlags))
186 return;
187 }
188
189 EmitBackendOutput(Diags, CodeGenOpts, TargetOpts, LangOpts,
190 C.getTargetInfo().getDataLayoutString(),
191 TheModule.get(), Action, AsmOutStream);
192
193 Ctx.setInlineAsmDiagnosticHandler(OldHandler, OldContext);
194
195 Ctx.setDiagnosticHandler(OldDiagnosticHandler, OldDiagnosticContext);
196 }
197
198 void HandleTagDeclDefinition(TagDecl *D) override {
199 PrettyStackTraceDecl CrashInfo(D, SourceLocation(),
200 Context->getSourceManager(),
201 "LLVM IR generation of declaration");
202 Gen->HandleTagDeclDefinition(D);
203 }
204
205 void HandleTagDeclRequiredDefinition(const TagDecl *D) override {
206 Gen->HandleTagDeclRequiredDefinition(D);
207 }
208
209 void CompleteTentativeDefinition(VarDecl *D) override {
210 Gen->CompleteTentativeDefinition(D);
211 }
212
213 void HandleVTable(CXXRecordDecl *RD) override {
214 Gen->HandleVTable(RD);
215 }
216
217 void HandleLinkerOptionPragma(llvm::StringRef Opts) override {
218 Gen->HandleLinkerOptionPragma(Opts);
219 }
220
221 void HandleDetectMismatch(llvm::StringRef Name,
222 llvm::StringRef Value) override {
223 Gen->HandleDetectMismatch(Name, Value);
224 }
225
226 void HandleDependentLibrary(llvm::StringRef Opts) override {
227 Gen->HandleDependentLibrary(Opts);
228 }
229
230 static void InlineAsmDiagHandler(const llvm::SMDiagnostic &SM,void *Context,
231 unsigned LocCookie) {
232 SourceLocation Loc = SourceLocation::getFromRawEncoding(LocCookie);
233 ((BackendConsumer*)Context)->InlineAsmDiagHandler2(SM, Loc);
234 }
235
236 static void DiagnosticHandler(const llvm::DiagnosticInfo &DI,
237 void *Context) {
238 ((BackendConsumer *)Context)->DiagnosticHandlerImpl(DI);
239 }
240
241 void InlineAsmDiagHandler2(const llvm::SMDiagnostic &,
242 SourceLocation LocCookie);
243
244 void DiagnosticHandlerImpl(const llvm::DiagnosticInfo &DI);
245 /// \brief Specialized handler for InlineAsm diagnostic.
246 /// \return True if the diagnostic has been successfully reported, false
247 /// otherwise.
248 bool InlineAsmDiagHandler(const llvm::DiagnosticInfoInlineAsm &D);
249 /// \brief Specialized handler for StackSize diagnostic.
250 /// \return True if the diagnostic has been successfully reported, false
251 /// otherwise.
252 bool StackSizeDiagHandler(const llvm::DiagnosticInfoStackSize &D);
253 /// \brief Specialized handlers for optimization remarks.
254 /// Note that these handlers only accept remarks and they always handle
255 /// them.
256 void EmitOptimizationMessage(const llvm::DiagnosticInfoOptimizationBase &D,
257 unsigned DiagID);
258 void
259 OptimizationRemarkHandler(const llvm::DiagnosticInfoOptimizationRemark &D);
260 void OptimizationRemarkHandler(
261 const llvm::DiagnosticInfoOptimizationRemarkMissed &D);
262 void OptimizationRemarkHandler(
263 const llvm::DiagnosticInfoOptimizationRemarkAnalysis &D);
264 void OptimizationRemarkHandler(
265 const llvm::DiagnosticInfoOptimizationRemarkAnalysisFPCommute &D);
266 void OptimizationRemarkHandler(
267 const llvm::DiagnosticInfoOptimizationRemarkAnalysisAliasing &D);
268 void OptimizationFailureHandler(
269 const llvm::DiagnosticInfoOptimizationFailure &D);
270 };
271
272 void BackendConsumer::anchor() {}
273}
274
275/// ConvertBackendLocation - Convert a location in a temporary llvm::SourceMgr
276/// buffer to be a valid FullSourceLoc.
277static FullSourceLoc ConvertBackendLocation(const llvm::SMDiagnostic &D,
278 SourceManager &CSM) {
279 // Get both the clang and llvm source managers. The location is relative to
280 // a memory buffer that the LLVM Source Manager is handling, we need to add
281 // a copy to the Clang source manager.
282 const llvm::SourceMgr &LSM = *D.getSourceMgr();
283
284 // We need to copy the underlying LLVM memory buffer because llvm::SourceMgr
285 // already owns its one and clang::SourceManager wants to own its one.
286 const MemoryBuffer *LBuf =
287 LSM.getMemoryBuffer(LSM.FindBufferContainingLoc(D.getLoc()));
288
289 // Create the copy and transfer ownership to clang::SourceManager.
290 // TODO: Avoid copying files into memory.
291 std::unique_ptr<llvm::MemoryBuffer> CBuf =
292 llvm::MemoryBuffer::getMemBufferCopy(LBuf->getBuffer(),
293 LBuf->getBufferIdentifier());
294 // FIXME: Keep a file ID map instead of creating new IDs for each location.
295 FileID FID = CSM.createFileID(std::move(CBuf));
296
297 // Translate the offset into the file.
298 unsigned Offset = D.getLoc().getPointer() - LBuf->getBufferStart();
299 SourceLocation NewLoc =
300 CSM.getLocForStartOfFile(FID).getLocWithOffset(Offset);
301 return FullSourceLoc(NewLoc, CSM);
302}
303
304
305/// InlineAsmDiagHandler2 - This function is invoked when the backend hits an
306/// error parsing inline asm. The SMDiagnostic indicates the error relative to
307/// the temporary memory buffer that the inline asm parser has set up.
308void BackendConsumer::InlineAsmDiagHandler2(const llvm::SMDiagnostic &D,
309 SourceLocation LocCookie) {
310 // There are a couple of different kinds of errors we could get here. First,
311 // we re-format the SMDiagnostic in terms of a clang diagnostic.
312
313 // Strip "error: " off the start of the message string.
314 StringRef Message = D.getMessage();
315 if (Message.startswith("error: "))
316 Message = Message.substr(7);
317
318 // If the SMDiagnostic has an inline asm source location, translate it.
319 FullSourceLoc Loc;
320 if (D.getLoc() != SMLoc())
321 Loc = ConvertBackendLocation(D, Context->getSourceManager());
322
323 unsigned DiagID;
324 switch (D.getKind()) {
325 case llvm::SourceMgr::DK_Error:
326 DiagID = diag::err_fe_inline_asm;
327 break;
328 case llvm::SourceMgr::DK_Warning:
329 DiagID = diag::warn_fe_inline_asm;
330 break;
331 case llvm::SourceMgr::DK_Note:
332 DiagID = diag::note_fe_inline_asm;
333 break;
334 }
335 // If this problem has clang-level source location information, report the
336 // issue in the source with a note showing the instantiated
337 // code.
338 if (LocCookie.isValid()) {
339 Diags.Report(LocCookie, DiagID).AddString(Message);
340
341 if (D.getLoc().isValid()) {
342 DiagnosticBuilder B = Diags.Report(Loc, diag::note_fe_inline_asm_here);
343 // Convert the SMDiagnostic ranges into SourceRange and attach them
344 // to the diagnostic.
345 for (const std::pair<unsigned, unsigned> &Range : D.getRanges()) {
346 unsigned Column = D.getColumnNo();
347 B << SourceRange(Loc.getLocWithOffset(Range.first - Column),
348 Loc.getLocWithOffset(Range.second - Column));
349 }
350 }
351 return;
352 }
353
354 // Otherwise, report the backend issue as occurring in the generated .s file.
355 // If Loc is invalid, we still need to report the issue, it just gets no
356 // location info.
357 Diags.Report(Loc, DiagID).AddString(Message);
358}
359
360#define ComputeDiagID(Severity, GroupName, DiagID) \
361 do { \
362 switch (Severity) { \
363 case llvm::DS_Error: \
364 DiagID = diag::err_fe_##GroupName; \
365 break; \
366 case llvm::DS_Warning: \
367 DiagID = diag::warn_fe_##GroupName; \
368 break; \
369 case llvm::DS_Remark: \
370 llvm_unreachable("'remark' severity not expected")::llvm::llvm_unreachable_internal("'remark' severity not expected"
, "/tmp/buildd/llvm-toolchain-snapshot-3.8~svn257205/tools/clang/lib/CodeGen/CodeGenAction.cpp"
, 370); \
371 break; \
372 case llvm::DS_Note: \
373 DiagID = diag::note_fe_##GroupName; \
374 break; \
375 } \
376 } while (false)
377
378#define ComputeDiagRemarkID(Severity, GroupName, DiagID)do { switch (Severity) { case llvm::DS_Error: DiagID = diag::
err_fe_GroupName; break; case llvm::DS_Warning: DiagID = diag
::warn_fe_GroupName; break; case llvm::DS_Remark: DiagID = diag
::remark_fe_GroupName; break; case llvm::DS_Note: DiagID = diag
::note_fe_GroupName; break; } } while (false) \
379 do { \
380 switch (Severity) { \
381 case llvm::DS_Error: \
382 DiagID = diag::err_fe_##GroupName; \
383 break; \
384 case llvm::DS_Warning: \
385 DiagID = diag::warn_fe_##GroupName; \
386 break; \
387 case llvm::DS_Remark: \
388 DiagID = diag::remark_fe_##GroupName; \
389 break; \
390 case llvm::DS_Note: \
391 DiagID = diag::note_fe_##GroupName; \
392 break; \
393 } \
394 } while (false)
395
396bool
397BackendConsumer::InlineAsmDiagHandler(const llvm::DiagnosticInfoInlineAsm &D) {
398 unsigned DiagID;
399 ComputeDiagID(D.getSeverity(), inline_asm, DiagID);
400 std::string Message = D.getMsgStr().str();
401
402 // If this problem has clang-level source location information, report the
403 // issue as being a problem in the source with a note showing the instantiated
404 // code.
405 SourceLocation LocCookie =
406 SourceLocation::getFromRawEncoding(D.getLocCookie());
407 if (LocCookie.isValid())
408 Diags.Report(LocCookie, DiagID).AddString(Message);
409 else {
410 // Otherwise, report the backend diagnostic as occurring in the generated
411 // .s file.
412 // If Loc is invalid, we still need to report the diagnostic, it just gets
413 // no location info.
414 FullSourceLoc Loc;
415 Diags.Report(Loc, DiagID).AddString(Message);
416 }
417 // We handled all the possible severities.
418 return true;
419}
420
421bool
422BackendConsumer::StackSizeDiagHandler(const llvm::DiagnosticInfoStackSize &D) {
423 if (D.getSeverity() != llvm::DS_Warning)
424 // For now, the only support we have for StackSize diagnostic is warning.
425 // We do not know how to format other severities.
426 return false;
427
428 if (const Decl *ND = Gen->GetDeclForMangledName(D.getFunction().getName())) {
429 Diags.Report(ND->getASTContext().getFullLoc(ND->getLocation()),
430 diag::warn_fe_frame_larger_than)
431 << D.getStackSize() << Decl::castToDeclContext(ND);
432 return true;
433 }
434
435 return false;
436}
437
438void BackendConsumer::EmitOptimizationMessage(
439 const llvm::DiagnosticInfoOptimizationBase &D, unsigned DiagID) {
440 // We only support warnings and remarks.
441 assert(D.getSeverity() == llvm::DS_Remark ||((D.getSeverity() == llvm::DS_Remark || D.getSeverity() == llvm
::DS_Warning) ? static_cast<void> (0) : __assert_fail (
"D.getSeverity() == llvm::DS_Remark || D.getSeverity() == llvm::DS_Warning"
, "/tmp/buildd/llvm-toolchain-snapshot-3.8~svn257205/tools/clang/lib/CodeGen/CodeGenAction.cpp"
, 442, __PRETTY_FUNCTION__))
442 D.getSeverity() == llvm::DS_Warning)((D.getSeverity() == llvm::DS_Remark || D.getSeverity() == llvm
::DS_Warning) ? static_cast<void> (0) : __assert_fail (
"D.getSeverity() == llvm::DS_Remark || D.getSeverity() == llvm::DS_Warning"
, "/tmp/buildd/llvm-toolchain-snapshot-3.8~svn257205/tools/clang/lib/CodeGen/CodeGenAction.cpp"
, 442, __PRETTY_FUNCTION__));
443
444 SourceManager &SourceMgr = Context->getSourceManager();
445 FileManager &FileMgr = SourceMgr.getFileManager();
446 StringRef Filename;
447 unsigned Line, Column;
2
←
'Line' declared without an initial value
→
448 SourceLocation DILoc;
449
450 if (D.isLocationAvailable()) {
3
←
Taking false branch
→
451 D.getLocation(&Filename, &Line, &Column);
452 const FileEntry *FE = FileMgr.getFile(Filename);
453 if (FE && Line > 0) {
454 // If -gcolumn-info was not used, Column will be 0. This upsets the
455 // source manager, so pass 1 if Column is not set.
456 DILoc = SourceMgr.translateFileLineCol(FE, Line, Column ? Column : 1);
457 }
458 }
459
460 // If a location isn't available, try to approximate it using the associated
461 // function definition. We use the definition's right brace to differentiate
462 // from diagnostics that genuinely relate to the function itself.
463 FullSourceLoc Loc(DILoc, SourceMgr);
464 if (Loc.isInvalid())
4
←
Taking true branch
→
465 if (const Decl *FD = Gen->GetDeclForMangledName(D.getFunction().getName()))
5
←
Assuming 'FD' is null
→
6
←
Taking false branch
→
466 Loc = FD->getASTContext().getFullLoc(FD->getBodyRBrace());
467
468 Diags.Report(Loc, DiagID)
469 << AddFlagValue(D.getPassName() ? D.getPassName() : "")
7
←
'?' condition is false
→
470 << D.getMsg().str();
471
472 if (DILoc.isInvalid() && D.isLocationAvailable())
8
←
Taking true branch
→
473 // If we were not able to translate the file:line:col information
474 // back to a SourceLocation, at least emit a note stating that
475 // we could not translate this location. This can happen in the
476 // case of #line directives.
477 Diags.Report(Loc, diag::note_fe_backend_optimization_remark_invalid_loc)
9
←
Function call argument is an uninitialized value
478 << Filename << Line << Column;
479}
480
481void BackendConsumer::OptimizationRemarkHandler(
482 const llvm::DiagnosticInfoOptimizationRemark &D) {
483 // Optimization remarks are active only if the -Rpass flag has a regular
484 // expression that matches the name of the pass name in \p D.
485 if (CodeGenOpts.OptimizationRemarkPattern &&
486 CodeGenOpts.OptimizationRemarkPattern->match(D.getPassName()))
487 EmitOptimizationMessage(D, diag::remark_fe_backend_optimization_remark);
488}
489
490void BackendConsumer::OptimizationRemarkHandler(
491 const llvm::DiagnosticInfoOptimizationRemarkMissed &D) {
492 // Missed optimization remarks are active only if the -Rpass-missed
493 // flag has a regular expression that matches the name of the pass
494 // name in \p D.
495 if (CodeGenOpts.OptimizationRemarkMissedPattern &&
496 CodeGenOpts.OptimizationRemarkMissedPattern->match(D.getPassName()))
497 EmitOptimizationMessage(D,
498 diag::remark_fe_backend_optimization_remark_missed);
499}
500
501void BackendConsumer::OptimizationRemarkHandler(
502 const llvm::DiagnosticInfoOptimizationRemarkAnalysis &D) {
503 // Optimization analysis remarks are active if the pass name is set to
504 // llvm::DiagnosticInfo::AlwasyPrint or if the -Rpass-analysis flag has a
505 // regular expression that matches the name of the pass name in \p D.
506
507 if (D.getPassName() == llvm::DiagnosticInfo::AlwaysPrint ||
508 (CodeGenOpts.OptimizationRemarkAnalysisPattern &&
509 CodeGenOpts.OptimizationRemarkAnalysisPattern->match(D.getPassName())))
510 EmitOptimizationMessage(
511 D, diag::remark_fe_backend_optimization_remark_analysis);
512}
513
514void BackendConsumer::OptimizationRemarkHandler(
515 const llvm::DiagnosticInfoOptimizationRemarkAnalysisFPCommute &D) {
516 // Optimization analysis remarks are active if the pass name is set to
517 // llvm::DiagnosticInfo::AlwasyPrint or if the -Rpass-analysis flag has a
518 // regular expression that matches the name of the pass name in \p D.
519
520 if (D.getPassName() == llvm::DiagnosticInfo::AlwaysPrint ||
521 (CodeGenOpts.OptimizationRemarkAnalysisPattern &&
522 CodeGenOpts.OptimizationRemarkAnalysisPattern->match(D.getPassName())))
523 EmitOptimizationMessage(
524 D, diag::remark_fe_backend_optimization_remark_analysis_fpcommute);
525}
526
527void BackendConsumer::OptimizationRemarkHandler(
528 const llvm::DiagnosticInfoOptimizationRemarkAnalysisAliasing &D) {
529 // Optimization analysis remarks are active if the pass name is set to
530 // llvm::DiagnosticInfo::AlwasyPrint or if the -Rpass-analysis flag has a
531 // regular expression that matches the name of the pass name in \p D.
532
533 if (D.getPassName() == llvm::DiagnosticInfo::AlwaysPrint ||
534 (CodeGenOpts.OptimizationRemarkAnalysisPattern &&
535 CodeGenOpts.OptimizationRemarkAnalysisPattern->match(D.getPassName())))
536 EmitOptimizationMessage(
537 D, diag::remark_fe_backend_optimization_remark_analysis_aliasing);
538}
539
540void BackendConsumer::OptimizationFailureHandler(
541 const llvm::DiagnosticInfoOptimizationFailure &D) {
542 EmitOptimizationMessage(D, diag::warn_fe_backend_optimization_failure);
1
Calling 'BackendConsumer::EmitOptimizationMessage'
→
543}
544
545/// \brief This function is invoked when the backend needs
546/// to report something to the user.
547void BackendConsumer::DiagnosticHandlerImpl(const DiagnosticInfo &DI) {
548 unsigned DiagID = diag::err_fe_inline_asm;
549 llvm::DiagnosticSeverity Severity = DI.getSeverity();
550 // Get the diagnostic ID based.
551 switch (DI.getKind()) {
552 case llvm::DK_InlineAsm:
553 if (InlineAsmDiagHandler(cast<DiagnosticInfoInlineAsm>(DI)))
554 return;
555 ComputeDiagID(Severity, inline_asm, DiagID);
556 break;
557 case llvm::DK_StackSize:
558 if (StackSizeDiagHandler(cast<DiagnosticInfoStackSize>(DI)))
559 return;
560 ComputeDiagID(Severity, backend_frame_larger_than, DiagID);
561 break;
562 case DK_Linker:
563 assert(CurLinkModule)((CurLinkModule) ? static_cast<void> (0) : __assert_fail
("CurLinkModule", "/tmp/buildd/llvm-toolchain-snapshot-3.8~svn257205/tools/clang/lib/CodeGen/CodeGenAction.cpp"
, 563, __PRETTY_FUNCTION__));
564 // FIXME: stop eating the warnings and notes.
565 if (Severity != DS_Error)
566 return;
567 DiagID = diag::err_fe_cannot_link_module;
568 break;
569 case llvm::DK_OptimizationRemark:
570 // Optimization remarks are always handled completely by this
571 // handler. There is no generic way of emitting them.
572 OptimizationRemarkHandler(cast<DiagnosticInfoOptimizationRemark>(DI));
573 return;
574 case llvm::DK_OptimizationRemarkMissed:
575 // Optimization remarks are always handled completely by this
576 // handler. There is no generic way of emitting them.
577 OptimizationRemarkHandler(cast<DiagnosticInfoOptimizationRemarkMissed>(DI));
578 return;
579 case llvm::DK_OptimizationRemarkAnalysis:
580 // Optimization remarks are always handled completely by this
581 // handler. There is no generic way of emitting them.
582 OptimizationRemarkHandler(
583 cast<DiagnosticInfoOptimizationRemarkAnalysis>(DI));
584 return;
585 case llvm::DK_OptimizationRemarkAnalysisFPCommute:
586 // Optimization remarks are always handled completely by this
587 // handler. There is no generic way of emitting them.
588 OptimizationRemarkHandler(
589 cast<DiagnosticInfoOptimizationRemarkAnalysisFPCommute>(DI));
590 return;
591 case llvm::DK_OptimizationRemarkAnalysisAliasing:
592 // Optimization remarks are always handled completely by this
593 // handler. There is no generic way of emitting them.
594 OptimizationRemarkHandler(
595 cast<DiagnosticInfoOptimizationRemarkAnalysisAliasing>(DI));
596 return;
597 case llvm::DK_OptimizationFailure:
598 // Optimization failures are always handled completely by this
599 // handler.
600 OptimizationFailureHandler(cast<DiagnosticInfoOptimizationFailure>(DI));
601 return;
602 default:
603 // Plugin IDs are not bound to any value as they are set dynamically.
604 ComputeDiagRemarkID(Severity, backend_plugin, DiagID)do { switch (Severity) { case llvm::DS_Error: DiagID = diag::
err_fe_backend_plugin; break; case llvm::DS_Warning: DiagID =
diag::warn_fe_backend_plugin; break; case llvm::DS_Remark: DiagID
= diag::remark_fe_backend_plugin; break; case llvm::DS_Note:
DiagID = diag::note_fe_backend_plugin; break; } } while (false
);
605 break;
606 }
607 std::string MsgStorage;
608 {
609 raw_string_ostream Stream(MsgStorage);
610 DiagnosticPrinterRawOStream DP(Stream);
611 DI.print(DP);
612 }
613
614 if (DiagID == diag::err_fe_cannot_link_module) {
615 Diags.Report(diag::err_fe_cannot_link_module)
616 << CurLinkModule->getModuleIdentifier() << MsgStorage;
617 return;
618 }
619
620 // Report the backend message using the usual diagnostic mechanism.
621 FullSourceLoc Loc;
622 Diags.Report(Loc, DiagID).AddString(MsgStorage);
623}
624#undef ComputeDiagID
625
626CodeGenAction::CodeGenAction(unsigned _Act, LLVMContext *_VMContext)
627 : Act(_Act), VMContext(_VMContext ? _VMContext : new LLVMContext),
628 OwnsVMContext(!_VMContext) {}
629
630CodeGenAction::~CodeGenAction() {
631 TheModule.reset();
632 if (OwnsVMContext)
633 delete VMContext;
634}
635
636bool CodeGenAction::hasIRSupport() const { return true; }
637
638void CodeGenAction::EndSourceFileAction() {
639 // If the consumer creation failed, do nothing.
640 if (!getCompilerInstance().hasASTConsumer())
641 return;
642
643 // Take back ownership of link modules we passed to consumer.
644 if (!LinkModules.empty())
645 BEConsumer->releaseLinkModules();
646
647 // Steal the module from the consumer.
648 TheModule = BEConsumer->takeModule();
649}
650
651std::unique_ptr<llvm::Module> CodeGenAction::takeModule() {
652 return std::move(TheModule);
653}
654
655llvm::LLVMContext *CodeGenAction::takeLLVMContext() {
656 OwnsVMContext = false;
657 return VMContext;
658}
659
660static raw_pwrite_stream *
661GetOutputStream(CompilerInstance &CI, StringRef InFile, BackendAction Action) {
662 switch (Action) {
663 case Backend_EmitAssembly:
664 return CI.createDefaultOutputFile(false, InFile, "s");
665 case Backend_EmitLL:
666 return CI.createDefaultOutputFile(false, InFile, "ll");
667 case Backend_EmitBC:
668 return CI.createDefaultOutputFile(true, InFile, "bc");
669 case Backend_EmitNothing:
670 return nullptr;
671 case Backend_EmitMCNull:
672 return CI.createNullOutputFile();
673 case Backend_EmitObj:
674 return CI.createDefaultOutputFile(true, InFile, "o");
675 }
676
677 llvm_unreachable("Invalid action!")::llvm::llvm_unreachable_internal("Invalid action!", "/tmp/buildd/llvm-toolchain-snapshot-3.8~svn257205/tools/clang/lib/CodeGen/CodeGenAction.cpp"
, 677);
678}
679
680std::unique_ptr<ASTConsumer>
681CodeGenAction::CreateASTConsumer(CompilerInstance &CI, StringRef InFile) {
682 BackendAction BA = static_cast<BackendAction>(Act);
683 raw_pwrite_stream *OS = GetOutputStream(CI, InFile, BA);
684 if (BA != Backend_EmitNothing && !OS)
685 return nullptr;
686
687 // Load bitcode modules to link with, if we need to.
688 if (LinkModules.empty())
689 for (auto &I : CI.getCodeGenOpts().LinkBitcodeFiles) {
690 const std::string &LinkBCFile = I.second;
691
692 auto BCBuf = CI.getFileManager().getBufferForFile(LinkBCFile);
693 if (!BCBuf) {
694 CI.getDiagnostics().Report(diag::err_cannot_open_file)
695 << LinkBCFile << BCBuf.getError().message();
696 LinkModules.clear();
697 return nullptr;
698 }
699
700 ErrorOr<std::unique_ptr<llvm::Module>> ModuleOrErr =
701 getLazyBitcodeModule(std::move(*BCBuf), *VMContext);
702 if (std::error_code EC = ModuleOrErr.getError()) {
703 CI.getDiagnostics().Report(diag::err_cannot_open_file) << LinkBCFile
704 << EC.message();
705 LinkModules.clear();
706 return nullptr;
707 }
708 addLinkModule(ModuleOrErr.get().release(), I.first);
709 }
710
711 CoverageSourceInfo *CoverageInfo = nullptr;
712 // Add the preprocessor callback only when the coverage mapping is generated.
713 if (CI.getCodeGenOpts().CoverageMapping) {
714 CoverageInfo = new CoverageSourceInfo;
715 CI.getPreprocessor().addPPCallbacks(
716 std::unique_ptr<PPCallbacks>(CoverageInfo));
717 }
718
719 std::unique_ptr<BackendConsumer> Result(new BackendConsumer(
720 BA, CI.getDiagnostics(), CI.getHeaderSearchOpts(),
721 CI.getPreprocessorOpts(), CI.getCodeGenOpts(), CI.getTargetOpts(),
722 CI.getLangOpts(), CI.getFrontendOpts().ShowTimers, InFile, LinkModules,
723 OS, *VMContext, CoverageInfo));
724 BEConsumer = Result.get();
725 return std::move(Result);
726}
727
728static void BitcodeInlineAsmDiagHandler(const llvm::SMDiagnostic &SM,
729 void *Context,
730 unsigned LocCookie) {
731 SM.print(nullptr, llvm::errs());
732}
733
734void CodeGenAction::ExecuteAction() {
735 // If this is an IR file, we have to treat it specially.
736 if (getCurrentFileKind() == IK_LLVM_IR) {
737 BackendAction BA = static_cast<BackendAction>(Act);
738 CompilerInstance &CI = getCompilerInstance();
739 raw_pwrite_stream *OS = GetOutputStream(CI, getCurrentFile(), BA);
740 if (BA != Backend_EmitNothing && !OS)
741 return;
742
743 bool Invalid;
744 SourceManager &SM = CI.getSourceManager();
745 FileID FID = SM.getMainFileID();
746 llvm::MemoryBuffer *MainFile = SM.getBuffer(FID, &Invalid);
747 if (Invalid)
748 return;
749
750 llvm::SMDiagnostic Err;
751 TheModule = parseIR(MainFile->getMemBufferRef(), Err, *VMContext);
752 if (!TheModule) {
753 // Translate from the diagnostic info to the SourceManager location if
754 // available.
755 // TODO: Unify this with ConvertBackendLocation()
756 SourceLocation Loc;
757 if (Err.getLineNo() > 0) {
758 assert(Err.getColumnNo() >= 0)((Err.getColumnNo() >= 0) ? static_cast<void> (0) : __assert_fail
("Err.getColumnNo() >= 0", "/tmp/buildd/llvm-toolchain-snapshot-3.8~svn257205/tools/clang/lib/CodeGen/CodeGenAction.cpp"
, 758, __PRETTY_FUNCTION__));
759 Loc = SM.translateFileLineCol(SM.getFileEntryForID(FID),
760 Err.getLineNo(), Err.getColumnNo() + 1);
761 }
762
763 // Strip off a leading diagnostic code if there is one.
764 StringRef Msg = Err.getMessage();
765 if (Msg.startswith("error: "))
766 Msg = Msg.substr(7);
767
768 unsigned DiagID =
769 CI.getDiagnostics().getCustomDiagID(DiagnosticsEngine::Error, "%0");
770
771 CI.getDiagnostics().Report(Loc, DiagID) << Msg;
772 return;
773 }
774 const TargetOptions &TargetOpts = CI.getTargetOpts();
775 if (TheModule->getTargetTriple() != TargetOpts.Triple) {
776 CI.getDiagnostics().Report(SourceLocation(),
777 diag::warn_fe_override_module)
778 << TargetOpts.Triple;
779 TheModule->setTargetTriple(TargetOpts.Triple);
780 }
781
782 LLVMContext &Ctx = TheModule->getContext();
783 Ctx.setInlineAsmDiagnosticHandler(BitcodeInlineAsmDiagHandler);
784 EmitBackendOutput(CI.getDiagnostics(), CI.getCodeGenOpts(), TargetOpts,
785 CI.getLangOpts(), CI.getTarget().getDataLayoutString(),
786 TheModule.get(), BA, OS);
787 return;
788 }
789
790 // Otherwise follow the normal AST path.
791 this->ASTFrontendAction::ExecuteAction();
792}
793
794//
795
796void EmitAssemblyAction::anchor() { }
797EmitAssemblyAction::EmitAssemblyAction(llvm::LLVMContext *_VMContext)
798 : CodeGenAction(Backend_EmitAssembly, _VMContext) {}
799
800void EmitBCAction::anchor() { }
801EmitBCAction::EmitBCAction(llvm::LLVMContext *_VMContext)
802 : CodeGenAction(Backend_EmitBC, _VMContext) {}
803
804void EmitLLVMAction::anchor() { }
805EmitLLVMAction::EmitLLVMAction(llvm::LLVMContext *_VMContext)
806 : CodeGenAction(Backend_EmitLL, _VMContext) {}
807
808void EmitLLVMOnlyAction::anchor() { }
809EmitLLVMOnlyAction::EmitLLVMOnlyAction(llvm::LLVMContext *_VMContext)
810 : CodeGenAction(Backend_EmitNothing, _VMContext) {}
811
812void EmitCodeGenOnlyAction::anchor() { }
813EmitCodeGenOnlyAction::EmitCodeGenOnlyAction(llvm::LLVMContext *_VMContext)
814 : CodeGenAction(Backend_EmitMCNull, _VMContext) {}
815
816void EmitObjAction::anchor() { }
817EmitObjAction::EmitObjAction(llvm::LLVMContext *_VMContext)
818 : CodeGenAction(Backend_EmitObj, _VMContext) {}