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//===--- CIRGenAction.cpp - LLVM Code generation Frontend Action ---------===//
//
// 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 "clang/CIR/FrontendAction/CIRGenAction.h"
#include "mlir/IR/MLIRContext.h"
#include "mlir/IR/OwningOpRef.h"
#include "clang/Basic/DiagnosticFrontend.h"
#include "clang/CIR/CIRGenerator.h"
#include "clang/CIR/CIRToCIRPasses.h"
#include "clang/CIR/LowerToLLVM.h"
#include "clang/CodeGen/BackendUtil.h"
#include "clang/Frontend/CompilerInstance.h"
#include "llvm/IR/Module.h"
using namespace cir;
using namespace clang;
namespace cir {
static BackendAction
getBackendActionFromOutputType(CIRGenAction::OutputType Action) {
switch (Action) {
case CIRGenAction::OutputType::EmitCIR:
assert(false &&
"Unsupported output type for getBackendActionFromOutputType!");
break; // Unreachable, but fall through to report that
case CIRGenAction::OutputType::EmitAssembly:
return BackendAction::Backend_EmitAssembly;
case CIRGenAction::OutputType::EmitBC:
return BackendAction::Backend_EmitBC;
case CIRGenAction::OutputType::EmitLLVM:
return BackendAction::Backend_EmitLL;
case CIRGenAction::OutputType::EmitObj:
return BackendAction::Backend_EmitObj;
}
// We should only get here if a non-enum value is passed in or we went through
// the assert(false) case above
llvm_unreachable("Unsupported output type!");
}
static std::unique_ptr<llvm::Module>
lowerFromCIRToLLVMIR(mlir::ModuleOp MLIRModule, llvm::LLVMContext &LLVMCtx) {
return direct::lowerDirectlyFromCIRToLLVMIR(MLIRModule, LLVMCtx);
}
class CIRGenConsumer : public clang::ASTConsumer {
virtual void anchor();
CIRGenAction::OutputType Action;
CompilerInstance &CI;
std::unique_ptr<raw_pwrite_stream> OutputStream;
ASTContext *Context{nullptr};
IntrusiveRefCntPtr<llvm::vfs::FileSystem> FS;
std::unique_ptr<CIRGenerator> Gen;
const FrontendOptions &FEOptions;
CodeGenOptions &CGO;
public:
CIRGenConsumer(CIRGenAction::OutputType Action, CompilerInstance &CI,
CodeGenOptions &CGO, std::unique_ptr<raw_pwrite_stream> OS)
: Action(Action), CI(CI), OutputStream(std::move(OS)),
FS(&CI.getVirtualFileSystem()),
Gen(std::make_unique<CIRGenerator>(CI.getDiagnostics(), std::move(FS),
CI.getCodeGenOpts())),
FEOptions(CI.getFrontendOpts()), CGO(CGO) {}
void Initialize(ASTContext &Ctx) override {
assert(!Context && "initialized multiple times");
Context = &Ctx;
Gen->Initialize(Ctx);
}
bool HandleTopLevelDecl(DeclGroupRef D) override {
Gen->HandleTopLevelDecl(D);
return true;
}
void HandleInlineFunctionDefinition(FunctionDecl *D) override {
Gen->HandleInlineFunctionDefinition(D);
}
void HandleTranslationUnit(ASTContext &C) override {
Gen->HandleTranslationUnit(C);
if (!FEOptions.ClangIRDisableCIRVerifier) {
if (!Gen->verifyModule()) {
CI.getDiagnostics().Report(
diag::err_cir_verification_failed_pre_passes);
llvm::report_fatal_error(
"CIR codegen: module verification error before running CIR passes");
return;
}
}
mlir::ModuleOp MlirModule = Gen->getModule();
mlir::MLIRContext &MlirCtx = Gen->getMLIRContext();
if (!FEOptions.ClangIRDisablePasses) {
// Setup and run CIR pipeline.
if (runCIRToCIRPasses(MlirModule, MlirCtx, C,
!FEOptions.ClangIRDisableCIRVerifier,
CGO.OptimizationLevel > 0)
.failed()) {
CI.getDiagnostics().Report(diag::err_cir_to_cir_transform_failed);
return;
}
}
switch (Action) {
case CIRGenAction::OutputType::EmitCIR:
if (OutputStream && MlirModule) {
mlir::OpPrintingFlags Flags;
Flags.enableDebugInfo(/*enable=*/true, /*prettyForm=*/false);
MlirModule->print(*OutputStream, Flags);
}
break;
case CIRGenAction::OutputType::EmitLLVM:
case CIRGenAction::OutputType::EmitBC:
case CIRGenAction::OutputType::EmitObj:
case CIRGenAction::OutputType::EmitAssembly: {
llvm::LLVMContext LLVMCtx;
std::unique_ptr<llvm::Module> LLVMModule =
lowerFromCIRToLLVMIR(MlirModule, LLVMCtx);
BackendAction BEAction = getBackendActionFromOutputType(Action);
emitBackendOutput(
CI, CI.getCodeGenOpts(), C.getTargetInfo().getDataLayoutString(),
LLVMModule.get(), BEAction, FS, std::move(OutputStream));
break;
}
}
}
void HandleTagDeclDefinition(TagDecl *D) override {
PrettyStackTraceDecl CrashInfo(D, SourceLocation(),
Context->getSourceManager(),
"CIR generation of declaration");
Gen->HandleTagDeclDefinition(D);
}
void CompleteTentativeDefinition(VarDecl *D) override {
Gen->CompleteTentativeDefinition(D);
}
};
} // namespace cir
void CIRGenConsumer::anchor() {}
CIRGenAction::CIRGenAction(OutputType Act, mlir::MLIRContext *MLIRCtx)
: MLIRCtx(MLIRCtx ? MLIRCtx : new mlir::MLIRContext), Action(Act) {}
CIRGenAction::~CIRGenAction() { MLIRMod.release(); }
static std::unique_ptr<raw_pwrite_stream>
getOutputStream(CompilerInstance &CI, StringRef InFile,
CIRGenAction::OutputType Action) {
switch (Action) {
case CIRGenAction::OutputType::EmitAssembly:
return CI.createDefaultOutputFile(false, InFile, "s");
case CIRGenAction::OutputType::EmitCIR:
return CI.createDefaultOutputFile(false, InFile, "cir");
case CIRGenAction::OutputType::EmitLLVM:
return CI.createDefaultOutputFile(false, InFile, "ll");
case CIRGenAction::OutputType::EmitBC:
return CI.createDefaultOutputFile(true, InFile, "bc");
case CIRGenAction::OutputType::EmitObj:
return CI.createDefaultOutputFile(true, InFile, "o");
}
llvm_unreachable("Invalid CIRGenAction::OutputType");
}
std::unique_ptr<ASTConsumer>
CIRGenAction::CreateASTConsumer(CompilerInstance &CI, StringRef InFile) {
std::unique_ptr<llvm::raw_pwrite_stream> Out = CI.takeOutputStream();
if (!Out)
Out = getOutputStream(CI, InFile, Action);
auto Result = std::make_unique<cir::CIRGenConsumer>(
Action, CI, CI.getCodeGenOpts(), std::move(Out));
return Result;
}
void EmitAssemblyAction::anchor() {}
EmitAssemblyAction::EmitAssemblyAction(mlir::MLIRContext *MLIRCtx)
: CIRGenAction(OutputType::EmitAssembly, MLIRCtx) {}
void EmitCIRAction::anchor() {}
EmitCIRAction::EmitCIRAction(mlir::MLIRContext *MLIRCtx)
: CIRGenAction(OutputType::EmitCIR, MLIRCtx) {}
void EmitLLVMAction::anchor() {}
EmitLLVMAction::EmitLLVMAction(mlir::MLIRContext *MLIRCtx)
: CIRGenAction(OutputType::EmitLLVM, MLIRCtx) {}
void EmitBCAction::anchor() {}
EmitBCAction::EmitBCAction(mlir::MLIRContext *MLIRCtx)
: CIRGenAction(OutputType::EmitBC, MLIRCtx) {}
void EmitObjAction::anchor() {}
EmitObjAction::EmitObjAction(mlir::MLIRContext *MLIRCtx)
: CIRGenAction(OutputType::EmitObj, MLIRCtx) {}
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