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//===--- FrontendAction.cpp -----------------------------------------------===//
//
// The LLVM Compiler Infrastructure
//
// This file is distributed under the University of Illinois Open Source
// License. See LICENSE.TXT for details.
//
//===----------------------------------------------------------------------===//
#include "clang/Frontend/FrontendAction.h"
#include "clang/AST/ASTContext.h"
#include "clang/Lex/HeaderSearch.h"
#include "clang/Lex/Preprocessor.h"
#include "clang/Frontend/ASTUnit.h"
#include "clang/Frontend/CompilerInstance.h"
#include "clang/Frontend/FrontendDiagnostic.h"
#include "clang/Sema/ParseAST.h"
#include "llvm/Support/MemoryBuffer.h"
#include "llvm/Support/Timer.h"
#include "llvm/Support/ErrorHandling.h"
#include "llvm/Support/raw_ostream.h"
using namespace clang;
FrontendAction::FrontendAction() : Instance(0) {}
FrontendAction::~FrontendAction() {}
void FrontendAction::setCurrentFile(llvm::StringRef Value, ASTUnit *AST) {
CurrentFile = Value;
CurrentASTUnit.reset(AST);
}
bool FrontendAction::BeginSourceFile(CompilerInstance &CI,
llvm::StringRef Filename,
bool IsAST) {
assert(!Instance && "Already processing a source file!");
assert(!Filename.empty() && "Unexpected empty filename!");
setCurrentFile(Filename);
setCompilerInstance(&CI);
// AST files follow a very different path, since they share objects via the
// AST unit.
if (IsAST) {
assert(!usesPreprocessorOnly() &&
"Attempt to pass AST file to preprocessor only action!");
assert(hasASTSupport() && "This action does not have AST support!");
std::string Error;
ASTUnit *AST = ASTUnit::LoadFromPCHFile(Filename, CI.getDiagnostics());
if (!AST)
goto failure;
setCurrentFile(Filename, AST);
// Set the shared objects, these are reset when we finish processing the
// file, otherwise the CompilerInstance will happily destroy them.
CI.setFileManager(&AST->getFileManager());
CI.setSourceManager(&AST->getSourceManager());
CI.setPreprocessor(&AST->getPreprocessor());
CI.setASTContext(&AST->getASTContext());
// Initialize the action.
if (!BeginSourceFileAction(CI, Filename))
goto failure;
/// Create the AST consumer.
CI.setASTConsumer(CreateASTConsumer(CI, Filename));
if (!CI.hasASTConsumer())
goto failure;
return true;
}
// Inform the diagnostic client we are processing a source file.
CI.getDiagnosticClient().BeginSourceFile(CI.getLangOpts(),
&CI.getPreprocessor());
// Initialize the action.
if (!BeginSourceFileAction(CI, Filename))
goto failure;
/// Create the AST context and consumer unless this is a preprocessor only
/// action.
if (!usesPreprocessorOnly()) {
CI.createASTContext();
CI.setASTConsumer(CreateASTConsumer(CI, Filename));
if (!CI.hasASTConsumer())
goto failure;
/// Use PCH?
if (!CI.getPreprocessorOpts().ImplicitPCHInclude.empty()) {
assert(hasPCHSupport() && "This action does not have PCH support!");
CI.createPCHExternalASTSource(
CI.getPreprocessorOpts().ImplicitPCHInclude);
if (!CI.getASTContext().getExternalSource())
goto failure;
}
}
// Initialize builtin info as long as we aren't using an external AST
// source.
if (!CI.hasASTContext() || !CI.getASTContext().getExternalSource()) {
Preprocessor &PP = CI.getPreprocessor();
PP.getBuiltinInfo().InitializeBuiltins(PP.getIdentifierTable(),
PP.getLangOptions().NoBuiltin);
}
return true;
// If we failed, reset state since the client will not end up calling the
// matching EndSourceFile().
failure:
if (isCurrentFileAST()) {
CI.takeASTContext();
CI.takePreprocessor();
CI.takeSourceManager();
CI.takeFileManager();
}
CI.getDiagnosticClient().EndSourceFile();
setCurrentFile("");
setCompilerInstance(0);
return false;
}
void FrontendAction::Execute() {
CompilerInstance &CI = getCompilerInstance();
// Initialize the main file entry. This needs to be delayed until after PCH
// has loaded.
if (isCurrentFileAST()) {
// Set the main file ID to an empty file.
//
// FIXME: We probably shouldn't need this, but for now this is the
// simplest way to reuse the logic in ParseAST.
const char *EmptyStr = "";
llvm::MemoryBuffer *SB =
llvm::MemoryBuffer::getMemBuffer(EmptyStr, EmptyStr, "<dummy input>");
CI.getSourceManager().createMainFileIDForMemBuffer(SB);
} else {
if (!CI.InitializeSourceManager(getCurrentFile()))
return;
}
if (CI.hasFrontendTimer()) {
llvm::TimeRegion Timer(CI.getFrontendTimer());
ExecuteAction();
}
else ExecuteAction();
}
void FrontendAction::EndSourceFile() {
CompilerInstance &CI = getCompilerInstance();
// Finalize the action.
EndSourceFileAction();
// Release the consumer and the AST, in that order since the consumer may
// perform actions in its destructor which require the context.
//
// FIXME: There is more per-file stuff we could just drop here?
if (CI.getFrontendOpts().DisableFree) {
CI.takeASTConsumer();
if (!isCurrentFileAST())
CI.takeASTContext();
} else {
CI.setASTConsumer(0);
if (!isCurrentFileAST())
CI.setASTContext(0);
}
if (CI.getFrontendOpts().ShowStats) {
llvm::errs() << "\nSTATISTICS FOR '" << getCurrentFile() << "':\n";
CI.getPreprocessor().PrintStats();
CI.getPreprocessor().getIdentifierTable().PrintStats();
CI.getPreprocessor().getHeaderSearchInfo().PrintStats();
CI.getSourceManager().PrintStats();
llvm::errs() << "\n";
}
// Cleanup the output streams, and erase the output files if we encountered
// an error.
CI.clearOutputFiles(/*EraseFiles=*/CI.getDiagnostics().getNumErrors());
// Inform the diagnostic client we are done with this source file.
CI.getDiagnosticClient().EndSourceFile();
if (isCurrentFileAST()) {
CI.takeASTContext();
CI.takePreprocessor();
CI.takeSourceManager();
CI.takeFileManager();
}
setCompilerInstance(0);
setCurrentFile("");
}
//===----------------------------------------------------------------------===//
// Utility Actions
//===----------------------------------------------------------------------===//
void ASTFrontendAction::ExecuteAction() {
CompilerInstance &CI = getCompilerInstance();
// FIXME: Move the truncation aspect of this into Sema, we delayed this till
// here so the source manager would be initialized.
if (hasCodeCompletionSupport() &&
!CI.getFrontendOpts().CodeCompletionAt.FileName.empty())
CI.createCodeCompletionConsumer();
// Use a code completion consumer?
CodeCompleteConsumer *CompletionConsumer = 0;
if (CI.hasCodeCompletionConsumer())
CompletionConsumer = &CI.getCodeCompletionConsumer();
ParseAST(CI.getPreprocessor(), &CI.getASTConsumer(), CI.getASTContext(),
CI.getFrontendOpts().ShowStats,
usesCompleteTranslationUnit(), CompletionConsumer);
}
ASTConsumer *
PreprocessorFrontendAction::CreateASTConsumer(CompilerInstance &CI,
llvm::StringRef InFile) {
llvm_unreachable("Invalid CreateASTConsumer on preprocessor action!");
}
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