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//===--- IncrementalAction.h - Incremental Frontend Action -*- 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
//
//===----------------------------------------------------------------------===//
#include "IncrementalAction.h"
#include "clang/AST/ASTConsumer.h"
#include "clang/CodeGen/CodeGenAction.h"
#include "clang/CodeGen/ModuleBuilder.h"
#include "clang/Frontend/CompilerInstance.h"
#include "clang/Frontend/FrontendOptions.h"
#include "clang/FrontendTool/Utils.h"
#include "clang/Interpreter/Interpreter.h"
#include "clang/Lex/PreprocessorOptions.h"
#include "clang/Sema/Sema.h"
#include "llvm/IR/Module.h"
#include "llvm/Support/Error.h"
#include "llvm/Support/ErrorHandling.h"
namespace clang {
IncrementalAction::IncrementalAction(CompilerInstance &Instance,
llvm::LLVMContext &LLVMCtx,
llvm::Error &Err, Interpreter &I,
std::unique_ptr<ASTConsumer> Consumer)
: WrapperFrontendAction([&]() {
llvm::ErrorAsOutParameter EAO(&Err);
std::unique_ptr<FrontendAction> Act;
switch (Instance.getFrontendOpts().ProgramAction) {
default:
Err = llvm::createStringError(
std::errc::state_not_recoverable,
"Driver initialization failed. "
"Incremental mode for action %d is not supported",
Instance.getFrontendOpts().ProgramAction);
return Act;
case frontend::ASTDump:
case frontend::ASTPrint:
case frontend::ParseSyntaxOnly:
Act = CreateFrontendAction(Instance);
break;
case frontend::PluginAction:
case frontend::EmitAssembly:
case frontend::EmitBC:
case frontend::EmitObj:
case frontend::PrintPreprocessedInput:
case frontend::EmitLLVMOnly:
Act.reset(new EmitLLVMOnlyAction(&LLVMCtx));
break;
}
return Act;
}()),
Interp(I), CI(Instance), Consumer(std::move(Consumer)) {}
std::unique_ptr<ASTConsumer>
IncrementalAction::CreateASTConsumer(CompilerInstance & /*CI*/,
StringRef InFile) {
std::unique_ptr<ASTConsumer> C =
WrapperFrontendAction::CreateASTConsumer(this->CI, InFile);
if (Consumer) {
std::vector<std::unique_ptr<ASTConsumer>> Cs;
Cs.push_back(std::move(Consumer));
Cs.push_back(std::move(C));
return std::make_unique<MultiplexConsumer>(std::move(Cs));
}
return std::make_unique<InProcessPrintingASTConsumer>(std::move(C), Interp);
}
void IncrementalAction::ExecuteAction() {
WrapperFrontendAction::ExecuteAction();
getCompilerInstance().getSema().CurContext = nullptr;
}
void IncrementalAction::EndSourceFile() {
if (IsTerminating && getWrapped())
WrapperFrontendAction::EndSourceFile();
}
void IncrementalAction::FinalizeAction() {
assert(!IsTerminating && "Already finalized!");
IsTerminating = true;
EndSourceFile();
}
void IncrementalAction::CacheCodeGenModule() {
CachedInCodeGenModule = GenModule();
}
llvm::Module *IncrementalAction::getCachedCodeGenModule() const {
return CachedInCodeGenModule.get();
}
std::unique_ptr<llvm::Module> IncrementalAction::GenModule() {
static unsigned ID = 0;
if (CodeGenerator *CG = getCodeGen()) {
// Clang's CodeGen is designed to work with a single llvm::Module. In many
// cases for convenience various CodeGen parts have a reference to the
// llvm::Module (TheModule or Module) which does not change when a new
// module is pushed. However, the execution engine wants to take ownership
// of the module which does not map well to CodeGen's design. To work this
// around we created an empty module to make CodeGen happy. We should make
// sure it always stays empty.
assert(((!CachedInCodeGenModule ||
!CI.getPreprocessorOpts().Includes.empty()) ||
(CachedInCodeGenModule->empty() &&
CachedInCodeGenModule->global_empty() &&
CachedInCodeGenModule->alias_empty() &&
CachedInCodeGenModule->ifunc_empty())) &&
"CodeGen wrote to a readonly module");
std::unique_ptr<llvm::Module> M(CG->ReleaseModule());
CG->StartModule("incr_module_" + std::to_string(ID++), M->getContext());
return M;
}
return nullptr;
}
CodeGenerator *IncrementalAction::getCodeGen() const {
FrontendAction *WrappedAct = getWrapped();
if (!WrappedAct || !WrappedAct->hasIRSupport())
return nullptr;
return static_cast<CodeGenAction *>(WrappedAct)->getCodeGenerator();
}
InProcessPrintingASTConsumer::InProcessPrintingASTConsumer(
std::unique_ptr<ASTConsumer> C, Interpreter &I)
: MultiplexConsumer(std::move(C)), Interp(I) {}
bool InProcessPrintingASTConsumer::HandleTopLevelDecl(DeclGroupRef DGR) {
if (DGR.isNull())
return true;
for (Decl *D : DGR)
if (auto *TLSD = llvm::dyn_cast<TopLevelStmtDecl>(D))
if (TLSD && TLSD->isSemiMissing()) {
auto ExprOrErr = Interp.convertExprToValue(cast<Expr>(TLSD->getStmt()));
if (llvm::Error E = ExprOrErr.takeError()) {
llvm::logAllUnhandledErrors(std::move(E), llvm::errs(),
"Value printing failed: ");
return false; // abort parsing
}
TLSD->setStmt(*ExprOrErr);
}
return MultiplexConsumer::HandleTopLevelDecl(DGR);
}
} // namespace clang
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