468 lines
16 KiB
C++
468 lines
16 KiB
C++
//===--- CodeGenAction.cpp - LLVM Code Generation Frontend Action ---------===//
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//
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// The LLVM Compiler Infrastructure
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//
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// This file is distributed under the University of Illinois Open Source
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// License. See LICENSE.TXT for details.
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//
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//===----------------------------------------------------------------------===//
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#include "clang/CodeGen/CodeGenAction.h"
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#include "clang/AST/ASTConsumer.h"
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#include "clang/AST/ASTContext.h"
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#include "clang/AST/DeclGroup.h"
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#include "clang/Basic/FileManager.h"
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#include "clang/Basic/SourceManager.h"
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#include "clang/Basic/TargetInfo.h"
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#include "clang/CodeGen/BackendUtil.h"
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#include "clang/CodeGen/ModuleBuilder.h"
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#include "clang/Frontend/CompilerInstance.h"
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#include "clang/Frontend/FrontendDiagnostic.h"
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#include "llvm/ADT/OwningPtr.h"
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#include "llvm/ADT/SmallString.h"
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#include "llvm/Bitcode/ReaderWriter.h"
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#include "llvm/IR/LLVMContext.h"
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#include "llvm/IR/Module.h"
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#include "llvm/IRReader/IRReader.h"
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#include "llvm/Linker.h"
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#include "llvm/Pass.h"
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#include "llvm/Support/MemoryBuffer.h"
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#include "llvm/Support/SourceMgr.h"
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#include "llvm/Support/Timer.h"
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using namespace clang;
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using namespace llvm;
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namespace clang {
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class BackendConsumer : public ASTConsumer {
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virtual void anchor();
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DiagnosticsEngine &Diags;
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BackendAction Action;
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const CodeGenOptions &CodeGenOpts;
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const TargetOptions &TargetOpts;
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const LangOptions &LangOpts;
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raw_ostream *AsmOutStream;
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ASTContext *Context;
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Timer LLVMIRGeneration;
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OwningPtr<CodeGenerator> Gen;
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OwningPtr<llvm::Module> TheModule, LinkModule;
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public:
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BackendConsumer(BackendAction action, DiagnosticsEngine &_Diags,
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const CodeGenOptions &compopts,
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const TargetOptions &targetopts,
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const LangOptions &langopts,
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bool TimePasses,
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const std::string &infile,
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llvm::Module *LinkModule,
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raw_ostream *OS,
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LLVMContext &C) :
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Diags(_Diags),
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Action(action),
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CodeGenOpts(compopts),
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TargetOpts(targetopts),
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LangOpts(langopts),
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AsmOutStream(OS),
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Context(),
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LLVMIRGeneration("LLVM IR Generation Time"),
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Gen(CreateLLVMCodeGen(Diags, infile, compopts, targetopts, C)),
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LinkModule(LinkModule)
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{
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llvm::TimePassesIsEnabled = TimePasses;
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}
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llvm::Module *takeModule() { return TheModule.take(); }
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llvm::Module *takeLinkModule() { return LinkModule.take(); }
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virtual void HandleCXXStaticMemberVarInstantiation(VarDecl *VD) {
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Gen->HandleCXXStaticMemberVarInstantiation(VD);
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}
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virtual void Initialize(ASTContext &Ctx) {
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Context = &Ctx;
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if (llvm::TimePassesIsEnabled)
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LLVMIRGeneration.startTimer();
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Gen->Initialize(Ctx);
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TheModule.reset(Gen->GetModule());
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if (llvm::TimePassesIsEnabled)
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LLVMIRGeneration.stopTimer();
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}
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virtual bool HandleTopLevelDecl(DeclGroupRef D) {
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PrettyStackTraceDecl CrashInfo(*D.begin(), SourceLocation(),
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Context->getSourceManager(),
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"LLVM IR generation of declaration");
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if (llvm::TimePassesIsEnabled)
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LLVMIRGeneration.startTimer();
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Gen->HandleTopLevelDecl(D);
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if (llvm::TimePassesIsEnabled)
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LLVMIRGeneration.stopTimer();
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return true;
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}
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virtual void HandleTranslationUnit(ASTContext &C) {
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{
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PrettyStackTraceString CrashInfo("Per-file LLVM IR generation");
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if (llvm::TimePassesIsEnabled)
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LLVMIRGeneration.startTimer();
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Gen->HandleTranslationUnit(C);
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if (llvm::TimePassesIsEnabled)
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LLVMIRGeneration.stopTimer();
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}
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// Silently ignore if we weren't initialized for some reason.
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if (!TheModule)
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return;
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// Make sure IR generation is happy with the module. This is released by
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// the module provider.
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llvm::Module *M = Gen->ReleaseModule();
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if (!M) {
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// The module has been released by IR gen on failures, do not double
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// free.
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TheModule.take();
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return;
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}
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assert(TheModule.get() == M &&
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"Unexpected module change during IR generation");
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// Link LinkModule into this module if present, preserving its validity.
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if (LinkModule) {
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std::string ErrorMsg;
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if (Linker::LinkModules(M, LinkModule.get(), Linker::PreserveSource,
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&ErrorMsg)) {
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Diags.Report(diag::err_fe_cannot_link_module)
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<< LinkModule->getModuleIdentifier() << ErrorMsg;
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return;
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}
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}
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// Install an inline asm handler so that diagnostics get printed through
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// our diagnostics hooks.
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LLVMContext &Ctx = TheModule->getContext();
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LLVMContext::InlineAsmDiagHandlerTy OldHandler =
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Ctx.getInlineAsmDiagnosticHandler();
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void *OldContext = Ctx.getInlineAsmDiagnosticContext();
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Ctx.setInlineAsmDiagnosticHandler(InlineAsmDiagHandler, this);
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EmitBackendOutput(Diags, CodeGenOpts, TargetOpts, LangOpts,
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TheModule.get(), Action, AsmOutStream);
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Ctx.setInlineAsmDiagnosticHandler(OldHandler, OldContext);
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}
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virtual void HandleTagDeclDefinition(TagDecl *D) {
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PrettyStackTraceDecl CrashInfo(D, SourceLocation(),
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Context->getSourceManager(),
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"LLVM IR generation of declaration");
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Gen->HandleTagDeclDefinition(D);
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}
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virtual void HandleTagDeclRequiredDefinition(const TagDecl *D) {
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Gen->HandleTagDeclRequiredDefinition(D);
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}
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virtual void CompleteTentativeDefinition(VarDecl *D) {
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Gen->CompleteTentativeDefinition(D);
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}
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virtual void HandleVTable(CXXRecordDecl *RD, bool DefinitionRequired) {
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Gen->HandleVTable(RD, DefinitionRequired);
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}
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virtual void HandleLinkerOptionPragma(llvm::StringRef Opts) {
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Gen->HandleLinkerOptionPragma(Opts);
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}
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virtual void HandleDetectMismatch(llvm::StringRef Name,
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llvm::StringRef Value) {
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Gen->HandleDetectMismatch(Name, Value);
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}
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virtual void HandleDependentLibrary(llvm::StringRef Opts) {
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Gen->HandleDependentLibrary(Opts);
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}
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static void InlineAsmDiagHandler(const llvm::SMDiagnostic &SM,void *Context,
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unsigned LocCookie) {
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SourceLocation Loc = SourceLocation::getFromRawEncoding(LocCookie);
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((BackendConsumer*)Context)->InlineAsmDiagHandler2(SM, Loc);
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}
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void InlineAsmDiagHandler2(const llvm::SMDiagnostic &,
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SourceLocation LocCookie);
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};
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void BackendConsumer::anchor() {}
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}
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/// ConvertBackendLocation - Convert a location in a temporary llvm::SourceMgr
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/// buffer to be a valid FullSourceLoc.
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static FullSourceLoc ConvertBackendLocation(const llvm::SMDiagnostic &D,
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SourceManager &CSM) {
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// Get both the clang and llvm source managers. The location is relative to
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// a memory buffer that the LLVM Source Manager is handling, we need to add
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// a copy to the Clang source manager.
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const llvm::SourceMgr &LSM = *D.getSourceMgr();
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// We need to copy the underlying LLVM memory buffer because llvm::SourceMgr
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// already owns its one and clang::SourceManager wants to own its one.
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const MemoryBuffer *LBuf =
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LSM.getMemoryBuffer(LSM.FindBufferContainingLoc(D.getLoc()));
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// Create the copy and transfer ownership to clang::SourceManager.
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llvm::MemoryBuffer *CBuf =
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llvm::MemoryBuffer::getMemBufferCopy(LBuf->getBuffer(),
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LBuf->getBufferIdentifier());
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FileID FID = CSM.createFileIDForMemBuffer(CBuf);
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// Translate the offset into the file.
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unsigned Offset = D.getLoc().getPointer() - LBuf->getBufferStart();
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SourceLocation NewLoc =
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CSM.getLocForStartOfFile(FID).getLocWithOffset(Offset);
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return FullSourceLoc(NewLoc, CSM);
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}
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/// InlineAsmDiagHandler2 - This function is invoked when the backend hits an
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/// error parsing inline asm. The SMDiagnostic indicates the error relative to
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/// the temporary memory buffer that the inline asm parser has set up.
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void BackendConsumer::InlineAsmDiagHandler2(const llvm::SMDiagnostic &D,
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SourceLocation LocCookie) {
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// There are a couple of different kinds of errors we could get here. First,
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// we re-format the SMDiagnostic in terms of a clang diagnostic.
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// Strip "error: " off the start of the message string.
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StringRef Message = D.getMessage();
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if (Message.startswith("error: "))
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Message = Message.substr(7);
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// If the SMDiagnostic has an inline asm source location, translate it.
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FullSourceLoc Loc;
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if (D.getLoc() != SMLoc())
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Loc = ConvertBackendLocation(D, Context->getSourceManager());
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// If this problem has clang-level source location information, report the
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// issue as being an error in the source with a note showing the instantiated
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// code.
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if (LocCookie.isValid()) {
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Diags.Report(LocCookie, diag::err_fe_inline_asm).AddString(Message);
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if (D.getLoc().isValid()) {
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DiagnosticBuilder B = Diags.Report(Loc, diag::note_fe_inline_asm_here);
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// Convert the SMDiagnostic ranges into SourceRange and attach them
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// to the diagnostic.
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for (unsigned i = 0, e = D.getRanges().size(); i != e; ++i) {
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std::pair<unsigned, unsigned> Range = D.getRanges()[i];
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unsigned Column = D.getColumnNo();
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B << SourceRange(Loc.getLocWithOffset(Range.first - Column),
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Loc.getLocWithOffset(Range.second - Column));
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}
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}
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return;
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}
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// Otherwise, report the backend error as occurring in the generated .s file.
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// If Loc is invalid, we still need to report the error, it just gets no
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// location info.
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Diags.Report(Loc, diag::err_fe_inline_asm).AddString(Message);
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}
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//
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CodeGenAction::CodeGenAction(unsigned _Act, LLVMContext *_VMContext)
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: Act(_Act), LinkModule(0),
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VMContext(_VMContext ? _VMContext : new LLVMContext),
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OwnsVMContext(!_VMContext) {}
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CodeGenAction::~CodeGenAction() {
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TheModule.reset();
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if (OwnsVMContext)
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delete VMContext;
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}
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bool CodeGenAction::hasIRSupport() const { return true; }
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void CodeGenAction::EndSourceFileAction() {
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// If the consumer creation failed, do nothing.
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if (!getCompilerInstance().hasASTConsumer())
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return;
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// If we were given a link module, release consumer's ownership of it.
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if (LinkModule)
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BEConsumer->takeLinkModule();
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// Steal the module from the consumer.
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TheModule.reset(BEConsumer->takeModule());
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}
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llvm::Module *CodeGenAction::takeModule() {
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return TheModule.take();
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}
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llvm::LLVMContext *CodeGenAction::takeLLVMContext() {
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OwnsVMContext = false;
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return VMContext;
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}
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static raw_ostream *GetOutputStream(CompilerInstance &CI,
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StringRef InFile,
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BackendAction Action) {
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switch (Action) {
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case Backend_EmitAssembly:
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return CI.createDefaultOutputFile(false, InFile, "s");
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case Backend_EmitLL:
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return CI.createDefaultOutputFile(false, InFile, "ll");
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case Backend_EmitBC:
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return CI.createDefaultOutputFile(true, InFile, "bc");
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case Backend_EmitNothing:
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return 0;
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case Backend_EmitMCNull:
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case Backend_EmitObj:
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return CI.createDefaultOutputFile(true, InFile, "o");
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}
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llvm_unreachable("Invalid action!");
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}
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ASTConsumer *CodeGenAction::CreateASTConsumer(CompilerInstance &CI,
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StringRef InFile) {
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BackendAction BA = static_cast<BackendAction>(Act);
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OwningPtr<raw_ostream> OS(GetOutputStream(CI, InFile, BA));
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if (BA != Backend_EmitNothing && !OS)
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return 0;
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llvm::Module *LinkModuleToUse = LinkModule;
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// If we were not given a link module, and the user requested that one be
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// loaded from bitcode, do so now.
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const std::string &LinkBCFile = CI.getCodeGenOpts().LinkBitcodeFile;
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if (!LinkModuleToUse && !LinkBCFile.empty()) {
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std::string ErrorStr;
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llvm::MemoryBuffer *BCBuf =
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CI.getFileManager().getBufferForFile(LinkBCFile, &ErrorStr);
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if (!BCBuf) {
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CI.getDiagnostics().Report(diag::err_cannot_open_file)
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<< LinkBCFile << ErrorStr;
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return 0;
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}
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LinkModuleToUse = getLazyBitcodeModule(BCBuf, *VMContext, &ErrorStr);
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if (!LinkModuleToUse) {
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CI.getDiagnostics().Report(diag::err_cannot_open_file)
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<< LinkBCFile << ErrorStr;
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return 0;
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}
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}
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BEConsumer =
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new BackendConsumer(BA, CI.getDiagnostics(),
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CI.getCodeGenOpts(), CI.getTargetOpts(),
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CI.getLangOpts(),
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CI.getFrontendOpts().ShowTimers, InFile,
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LinkModuleToUse, OS.take(), *VMContext);
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return BEConsumer;
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}
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void CodeGenAction::ExecuteAction() {
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// If this is an IR file, we have to treat it specially.
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if (getCurrentFileKind() == IK_LLVM_IR) {
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BackendAction BA = static_cast<BackendAction>(Act);
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CompilerInstance &CI = getCompilerInstance();
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raw_ostream *OS = GetOutputStream(CI, getCurrentFile(), BA);
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if (BA != Backend_EmitNothing && !OS)
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return;
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bool Invalid;
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SourceManager &SM = CI.getSourceManager();
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const llvm::MemoryBuffer *MainFile = SM.getBuffer(SM.getMainFileID(),
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&Invalid);
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if (Invalid)
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return;
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// FIXME: This is stupid, IRReader shouldn't take ownership.
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llvm::MemoryBuffer *MainFileCopy =
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llvm::MemoryBuffer::getMemBufferCopy(MainFile->getBuffer(),
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getCurrentFile());
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llvm::SMDiagnostic Err;
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TheModule.reset(ParseIR(MainFileCopy, Err, *VMContext));
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if (!TheModule) {
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// Translate from the diagnostic info to the SourceManager location.
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SourceLocation Loc = SM.translateFileLineCol(
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SM.getFileEntryForID(SM.getMainFileID()), Err.getLineNo(),
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Err.getColumnNo() + 1);
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// Get a custom diagnostic for the error. We strip off a leading
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// diagnostic code if there is one.
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StringRef Msg = Err.getMessage();
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if (Msg.startswith("error: "))
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Msg = Msg.substr(7);
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// Escape '%', which is interpreted as a format character.
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SmallString<128> EscapedMessage;
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for (unsigned i = 0, e = Msg.size(); i != e; ++i) {
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if (Msg[i] == '%')
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EscapedMessage += '%';
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EscapedMessage += Msg[i];
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}
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unsigned DiagID = CI.getDiagnostics().getCustomDiagID(
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DiagnosticsEngine::Error, EscapedMessage);
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CI.getDiagnostics().Report(Loc, DiagID);
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return;
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}
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EmitBackendOutput(CI.getDiagnostics(), CI.getCodeGenOpts(),
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CI.getTargetOpts(), CI.getLangOpts(),
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TheModule.get(),
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BA, OS);
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return;
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}
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// Otherwise follow the normal AST path.
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this->ASTFrontendAction::ExecuteAction();
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}
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//
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void EmitAssemblyAction::anchor() { }
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EmitAssemblyAction::EmitAssemblyAction(llvm::LLVMContext *_VMContext)
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: CodeGenAction(Backend_EmitAssembly, _VMContext) {}
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void EmitBCAction::anchor() { }
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EmitBCAction::EmitBCAction(llvm::LLVMContext *_VMContext)
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: CodeGenAction(Backend_EmitBC, _VMContext) {}
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void EmitLLVMAction::anchor() { }
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EmitLLVMAction::EmitLLVMAction(llvm::LLVMContext *_VMContext)
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: CodeGenAction(Backend_EmitLL, _VMContext) {}
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void EmitLLVMOnlyAction::anchor() { }
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EmitLLVMOnlyAction::EmitLLVMOnlyAction(llvm::LLVMContext *_VMContext)
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: CodeGenAction(Backend_EmitNothing, _VMContext) {}
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void EmitCodeGenOnlyAction::anchor() { }
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EmitCodeGenOnlyAction::EmitCodeGenOnlyAction(llvm::LLVMContext *_VMContext)
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: CodeGenAction(Backend_EmitMCNull, _VMContext) {}
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void EmitObjAction::anchor() { }
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EmitObjAction::EmitObjAction(llvm::LLVMContext *_VMContext)
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: CodeGenAction(Backend_EmitObj, _VMContext) {}
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