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//===--- GeneratePCH.cpp - Sema Consumer for PCH Generation -----*- C++ -*-===//
//
// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
// See https://llvm.org/LICENSE.txt for license information.
// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
//
//===----------------------------------------------------------------------===//
//
// This file defines the PCHGenerator, which as a SemaConsumer that generates
// a PCH file.
//
//===----------------------------------------------------------------------===//
#include "clang/AST/ASTContext.h"
#include "clang/Frontend/FrontendDiagnostic.h"
#include "clang/Lex/HeaderSearch.h"
#include "clang/Lex/Preprocessor.h"
#include "clang/Sema/SemaConsumer.h"
#include "clang/Serialization/ASTReader.h"
#include "clang/Serialization/ASTWriter.h"
#include "llvm/Bitstream/BitstreamWriter.h"
using namespace clang;
PCHGenerator::PCHGenerator(
const Preprocessor &PP, InMemoryModuleCache &ModuleCache,
StringRef OutputFile, StringRef isysroot, std::shared_ptr<PCHBuffer> Buffer,
ArrayRef<std::shared_ptr<ModuleFileExtension>> Extensions,
bool AllowASTWithErrors, bool IncludeTimestamps,
bool BuildingImplicitModule, bool ShouldCacheASTInMemory,
bool GeneratingReducedBMI)
: PP(PP), OutputFile(OutputFile), isysroot(isysroot.str()),
SemaPtr(nullptr), Buffer(std::move(Buffer)), Stream(this->Buffer->Data),
Writer(Stream, this->Buffer->Data, ModuleCache, Extensions,
IncludeTimestamps, BuildingImplicitModule, GeneratingReducedBMI),
AllowASTWithErrors(AllowASTWithErrors),
ShouldCacheASTInMemory(ShouldCacheASTInMemory) {
this->Buffer->IsComplete = false;
}
PCHGenerator::~PCHGenerator() {
}
Module *PCHGenerator::getEmittingModule(ASTContext &) {
Module *M = nullptr;
if (PP.getLangOpts().isCompilingModule()) {
M = PP.getHeaderSearchInfo().lookupModule(PP.getLangOpts().CurrentModule,
SourceLocation(),
/*AllowSearch*/ false);
if (!M)
assert(PP.getDiagnostics().hasErrorOccurred() &&
"emitting module but current module doesn't exist");
}
return M;
}
void PCHGenerator::HandleTranslationUnit(ASTContext &Ctx) {
// Don't create a PCH if there were fatal failures during module loading.
if (PP.getModuleLoader().HadFatalFailure)
return;
bool hasErrors = PP.getDiagnostics().hasErrorOccurred();
if (hasErrors && !AllowASTWithErrors)
return;
Module *Module = getEmittingModule(Ctx);
// Errors that do not prevent the PCH from being written should not cause the
// overall compilation to fail either.
if (AllowASTWithErrors)
PP.getDiagnostics().getClient()->clear();
// Emit the PCH file to the Buffer.
assert(SemaPtr && "No Sema?");
Buffer->Signature = Writer.WriteAST(*SemaPtr, OutputFile, Module, isysroot,
ShouldCacheASTInMemory);
Buffer->IsComplete = true;
}
ASTMutationListener *PCHGenerator::GetASTMutationListener() {
return &Writer;
}
ASTDeserializationListener *PCHGenerator::GetASTDeserializationListener() {
return &Writer;
}
ReducedBMIGenerator::ReducedBMIGenerator(const Preprocessor &PP,
InMemoryModuleCache &ModuleCache,
StringRef OutputFile)
: PCHGenerator(
PP, ModuleCache, OutputFile, llvm::StringRef(),
std::make_shared<PCHBuffer>(),
/*Extensions=*/ArrayRef<std::shared_ptr<ModuleFileExtension>>(),
/*AllowASTWithErrors*/ false, /*IncludeTimestamps=*/false,
/*BuildingImplicitModule=*/false, /*ShouldCacheASTInMemory=*/false,
/*GeneratingReducedBMI=*/true) {}
Module *ReducedBMIGenerator::getEmittingModule(ASTContext &Ctx) {
Module *M = Ctx.getCurrentNamedModule();
assert(M->isNamedModuleUnit() &&
"ReducedBMIGenerator should only be used with C++20 Named modules.");
return M;
}
void ReducedBMIGenerator::HandleTranslationUnit(ASTContext &Ctx) {
PCHGenerator::HandleTranslationUnit(Ctx);
if (!isComplete())
return;
std::error_code EC;
auto OS = std::make_unique<llvm::raw_fd_ostream>(getOutputFile(), EC);
if (EC) {
getDiagnostics().Report(diag::err_fe_unable_to_open_output)
<< getOutputFile() << EC.message() << "\n";
return;
}
*OS << getBufferPtr()->Data;
OS->flush();
}
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