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//===--- BackendConsumer.h - LLVM BackendConsumer Header File -------------===//
//
// 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
//
//===----------------------------------------------------------------------===//
#ifndef LLVM_CLANG_LIB_CODEGEN_BACKENDCONSUMER_H
#define LLVM_CLANG_LIB_CODEGEN_BACKENDCONSUMER_H
#include "clang/CodeGen/BackendUtil.h"
#include "clang/CodeGen/CodeGenAction.h"
#include "llvm/IR/DiagnosticInfo.h"
#include "llvm/Support/Timer.h"
namespace llvm {
class DiagnosticInfoDontCall;
}
namespace clang {
class ASTContext;
class CodeGenAction;
class CoverageSourceInfo;
class BackendConsumer : public ASTConsumer {
using LinkModule = CodeGenAction::LinkModule;
virtual void anchor();
DiagnosticsEngine &Diags;
BackendAction Action;
const HeaderSearchOptions &HeaderSearchOpts;
const CodeGenOptions &CodeGenOpts;
const TargetOptions &TargetOpts;
const LangOptions &LangOpts;
std::unique_ptr<raw_pwrite_stream> AsmOutStream;
ASTContext *Context;
IntrusiveRefCntPtr<llvm::vfs::FileSystem> FS;
llvm::Timer LLVMIRGeneration;
unsigned LLVMIRGenerationRefCount;
/// True if we've finished generating IR. This prevents us from generating
/// additional LLVM IR after emitting output in HandleTranslationUnit. This
/// can happen when Clang plugins trigger additional AST deserialization.
bool IRGenFinished = false;
bool TimerIsEnabled = false;
std::unique_ptr<CodeGenerator> Gen;
SmallVector<LinkModule, 4> LinkModules;
// A map from mangled names to their function's source location, used for
// backend diagnostics as the Clang AST may be unavailable. We actually use
// the mangled name's hash as the key because mangled names can be very
// long and take up lots of space. Using a hash can cause name collision,
// but that is rare and the consequences are pointing to a wrong source
// location which is not severe. This is a vector instead of an actual map
// because we optimize for time building this map rather than time
// retrieving an entry, as backend diagnostics are uncommon.
std::vector<std::pair<llvm::hash_code, FullSourceLoc>>
ManglingFullSourceLocs;
// This is here so that the diagnostic printer knows the module a diagnostic
// refers to.
llvm::Module *CurLinkModule = nullptr;
public:
BackendConsumer(BackendAction Action, DiagnosticsEngine &Diags,
IntrusiveRefCntPtr<llvm::vfs::FileSystem> VFS,
const HeaderSearchOptions &HeaderSearchOpts,
const PreprocessorOptions &PPOpts,
const CodeGenOptions &CodeGenOpts,
const TargetOptions &TargetOpts, const LangOptions &LangOpts,
const std::string &InFile,
SmallVector<LinkModule, 4> LinkModules,
std::unique_ptr<raw_pwrite_stream> OS, llvm::LLVMContext &C,
CoverageSourceInfo *CoverageInfo = nullptr);
// This constructor is used in installing an empty BackendConsumer
// to use the clang diagnostic handler for IR input files. It avoids
// initializing the OS field.
BackendConsumer(BackendAction Action, DiagnosticsEngine &Diags,
IntrusiveRefCntPtr<llvm::vfs::FileSystem> VFS,
const HeaderSearchOptions &HeaderSearchOpts,
const PreprocessorOptions &PPOpts,
const CodeGenOptions &CodeGenOpts,
const TargetOptions &TargetOpts, const LangOptions &LangOpts,
llvm::Module *Module, SmallVector<LinkModule, 4> LinkModules,
llvm::LLVMContext &C,
CoverageSourceInfo *CoverageInfo = nullptr);
llvm::Module *getModule() const;
std::unique_ptr<llvm::Module> takeModule();
CodeGenerator *getCodeGenerator();
void HandleCXXStaticMemberVarInstantiation(VarDecl *VD) override;
void Initialize(ASTContext &Ctx) override;
bool HandleTopLevelDecl(DeclGroupRef D) override;
void HandleInlineFunctionDefinition(FunctionDecl *D) override;
void HandleInterestingDecl(DeclGroupRef D) override;
void HandleTranslationUnit(ASTContext &C) override;
void HandleTagDeclDefinition(TagDecl *D) override;
void HandleTagDeclRequiredDefinition(const TagDecl *D) override;
void CompleteTentativeDefinition(VarDecl *D) override;
void CompleteExternalDeclaration(DeclaratorDecl *D) override;
void AssignInheritanceModel(CXXRecordDecl *RD) override;
void HandleVTable(CXXRecordDecl *RD) override;
// Links each entry in LinkModules into our module. Returns true on error.
bool LinkInModules(llvm::Module *M);
/// Get the best possible source location to represent a diagnostic that
/// may have associated debug info.
const FullSourceLoc getBestLocationFromDebugLoc(
const llvm::DiagnosticInfoWithLocationBase &D,
bool &BadDebugInfo, StringRef &Filename,
unsigned &Line, unsigned &Column) const;
std::optional<FullSourceLoc> getFunctionSourceLocation(
const llvm::Function &F) const;
void DiagnosticHandlerImpl(const llvm::DiagnosticInfo &DI);
/// Specialized handler for InlineAsm diagnostic.
/// \return True if the diagnostic has been successfully reported, false
/// otherwise.
bool InlineAsmDiagHandler(const llvm::DiagnosticInfoInlineAsm &D);
/// Specialized handler for diagnostics reported using SMDiagnostic.
void SrcMgrDiagHandler(const llvm::DiagnosticInfoSrcMgr &D);
/// Specialized handler for StackSize diagnostic.
/// \return True if the diagnostic has been successfully reported, false
/// otherwise.
bool StackSizeDiagHandler(const llvm::DiagnosticInfoStackSize &D);
/// Specialized handler for ResourceLimit diagnostic.
/// \return True if the diagnostic has been successfully reported, false
/// otherwise.
bool ResourceLimitDiagHandler(const llvm::DiagnosticInfoResourceLimit &D);
/// Specialized handler for unsupported backend feature diagnostic.
void UnsupportedDiagHandler(const llvm::DiagnosticInfoUnsupported &D);
/// Specialized handlers for optimization remarks.
/// Note that these handlers only accept remarks and they always handle
/// them.
void EmitOptimizationMessage(const llvm::DiagnosticInfoOptimizationBase &D,
unsigned DiagID);
void
OptimizationRemarkHandler(const llvm::DiagnosticInfoOptimizationBase &D);
void OptimizationRemarkHandler(
const llvm::OptimizationRemarkAnalysisFPCommute &D);
void OptimizationRemarkHandler(
const llvm::OptimizationRemarkAnalysisAliasing &D);
void OptimizationFailureHandler(
const llvm::DiagnosticInfoOptimizationFailure &D);
void DontCallDiagHandler(const llvm::DiagnosticInfoDontCall &D);
/// Specialized handler for misexpect warnings.
/// Note that misexpect remarks are emitted through ORE
void MisExpectDiagHandler(const llvm::DiagnosticInfoMisExpect &D);
};
} // namespace clang
#endif
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