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5d7796e674
Changes: - Don't lookup the emitting module from HeaderSearch. We will use the module from the ASTContext directly. - Remove some useless arguments. Let's addback in the future if required.
126 lines
4.4 KiB
C++
126 lines
4.4 KiB
C++
//===--- GeneratePCH.cpp - Sema Consumer for PCH Generation -----*- C++ -*-===//
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//
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// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
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// See https://llvm.org/LICENSE.txt for license information.
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// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
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//
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//===----------------------------------------------------------------------===//
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//
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// This file defines the PCHGenerator, which as a SemaConsumer that generates
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// a PCH file.
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//
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//===----------------------------------------------------------------------===//
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#include "clang/AST/ASTContext.h"
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#include "clang/Frontend/FrontendDiagnostic.h"
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#include "clang/Lex/HeaderSearch.h"
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#include "clang/Lex/Preprocessor.h"
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#include "clang/Sema/SemaConsumer.h"
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#include "clang/Serialization/ASTReader.h"
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#include "clang/Serialization/ASTWriter.h"
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#include "llvm/Bitstream/BitstreamWriter.h"
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using namespace clang;
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PCHGenerator::PCHGenerator(
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const Preprocessor &PP, InMemoryModuleCache &ModuleCache,
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StringRef OutputFile, StringRef isysroot, std::shared_ptr<PCHBuffer> Buffer,
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ArrayRef<std::shared_ptr<ModuleFileExtension>> Extensions,
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bool AllowASTWithErrors, bool IncludeTimestamps,
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bool BuildingImplicitModule, bool ShouldCacheASTInMemory,
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bool GeneratingReducedBMI)
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: PP(PP), OutputFile(OutputFile), isysroot(isysroot.str()),
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SemaPtr(nullptr), Buffer(std::move(Buffer)), Stream(this->Buffer->Data),
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Writer(Stream, this->Buffer->Data, ModuleCache, Extensions,
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IncludeTimestamps, BuildingImplicitModule, GeneratingReducedBMI),
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AllowASTWithErrors(AllowASTWithErrors),
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ShouldCacheASTInMemory(ShouldCacheASTInMemory) {
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this->Buffer->IsComplete = false;
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}
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PCHGenerator::~PCHGenerator() {
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}
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Module *PCHGenerator::getEmittingModule(ASTContext &) {
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Module *M = nullptr;
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if (PP.getLangOpts().isCompilingModule()) {
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M = PP.getHeaderSearchInfo().lookupModule(PP.getLangOpts().CurrentModule,
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SourceLocation(),
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/*AllowSearch*/ false);
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if (!M)
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assert(PP.getDiagnostics().hasErrorOccurred() &&
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"emitting module but current module doesn't exist");
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}
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return M;
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}
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void PCHGenerator::HandleTranslationUnit(ASTContext &Ctx) {
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// Don't create a PCH if there were fatal failures during module loading.
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if (PP.getModuleLoader().HadFatalFailure)
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return;
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bool hasErrors = PP.getDiagnostics().hasErrorOccurred();
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if (hasErrors && !AllowASTWithErrors)
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return;
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Module *Module = getEmittingModule(Ctx);
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// Errors that do not prevent the PCH from being written should not cause the
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// overall compilation to fail either.
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if (AllowASTWithErrors)
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PP.getDiagnostics().getClient()->clear();
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// Emit the PCH file to the Buffer.
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assert(SemaPtr && "No Sema?");
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Buffer->Signature = Writer.WriteAST(*SemaPtr, OutputFile, Module, isysroot,
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ShouldCacheASTInMemory);
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Buffer->IsComplete = true;
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}
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ASTMutationListener *PCHGenerator::GetASTMutationListener() {
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return &Writer;
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}
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ASTDeserializationListener *PCHGenerator::GetASTDeserializationListener() {
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return &Writer;
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}
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ReducedBMIGenerator::ReducedBMIGenerator(const Preprocessor &PP,
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InMemoryModuleCache &ModuleCache,
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StringRef OutputFile)
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: PCHGenerator(
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PP, ModuleCache, OutputFile, llvm::StringRef(),
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std::make_shared<PCHBuffer>(),
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/*Extensions=*/ArrayRef<std::shared_ptr<ModuleFileExtension>>(),
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/*AllowASTWithErrors*/ false, /*IncludeTimestamps=*/false,
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/*BuildingImplicitModule=*/false, /*ShouldCacheASTInMemory=*/false,
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/*GeneratingReducedBMI=*/true) {}
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Module *ReducedBMIGenerator::getEmittingModule(ASTContext &Ctx) {
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Module *M = Ctx.getCurrentNamedModule();
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assert(M->isNamedModuleUnit() &&
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"ReducedBMIGenerator should only be used with C++20 Named modules.");
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return M;
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}
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void ReducedBMIGenerator::HandleTranslationUnit(ASTContext &Ctx) {
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PCHGenerator::HandleTranslationUnit(Ctx);
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if (!isComplete())
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return;
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std::error_code EC;
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auto OS = std::make_unique<llvm::raw_fd_ostream>(getOutputFile(), EC);
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if (EC) {
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getDiagnostics().Report(diag::err_fe_unable_to_open_output)
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<< getOutputFile() << EC.message() << "\n";
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return;
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}
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*OS << getBufferPtr()->Data;
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OS->flush();
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}
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