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//===- DebugTranslation.h - MLIR to LLVM Debug conversion -------*- 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 implements the translation between an MLIR debug information and
// the corresponding LLVMIR representation.
//
//===----------------------------------------------------------------------===//
#ifndef MLIR_LIB_TARGET_LLVMIR_DEBUGTRANSLATION_H_
#define MLIR_LIB_TARGET_LLVMIR_DEBUGTRANSLATION_H_
#include "mlir/Dialect/LLVMIR/LLVMDialect.h"
#include "mlir/IR/Location.h"
#include "llvm/ADT/SmallString.h"
#include "llvm/ADT/StringMap.h"
#include "llvm/IR/DIBuilder.h"
namespace mlir {
class Operation;
namespace LLVM {
class LLVMFuncOp;
namespace detail {
class DebugTranslation {
public:
DebugTranslation(Operation *module, llvm::Module &llvmModule);
/// Finalize the translation of debug information.
void finalize();
/// Translate the given location to an llvm debug location.
llvm::DILocation *translateLoc(Location loc, llvm::DILocalScope *scope);
/// Translates the given DWARF expression metadata to to LLVM.
llvm::DIExpression *translateExpression(LLVM::DIExpressionAttr attr);
/// Translates the given DWARF global variable expression to LLVM.
llvm::DIGlobalVariableExpression *
translateGlobalVariableExpression(LLVM::DIGlobalVariableExpressionAttr attr);
/// Translate the debug information for the given function.
void translate(LLVMFuncOp func, llvm::Function &llvmFunc);
/// Translate the given LLVM debug metadata to LLVM.
llvm::DINode *translate(DINodeAttr attr);
/// Translate the given derived LLVM debug metadata to LLVM.
template <typename DIAttrT>
auto translate(DIAttrT attr) {
// Infer the LLVM type from the attribute type.
using LLVMTypeT = std::remove_pointer_t<decltype(translateImpl(attr))>;
return cast_or_null<LLVMTypeT>(translate(DINodeAttr(attr)));
}
private:
/// Translate the given location to an llvm debug location with the given
/// scope and inlinedAt parameters.
llvm::DILocation *translateLoc(Location loc, llvm::DILocalScope *scope,
llvm::DILocation *inlinedAt);
/// Create an llvm debug file for the given file path.
llvm::DIFile *translateFile(StringRef fileName);
/// Translate the given attribute to the corresponding llvm debug metadata.
llvm::DIType *translateImpl(DINullTypeAttr attr);
llvm::DIBasicType *translateImpl(DIBasicTypeAttr attr);
llvm::DICompileUnit *translateImpl(DICompileUnitAttr attr);
llvm::DICompositeType *translateImpl(DICompositeTypeAttr attr);
llvm::DIDerivedType *translateImpl(DIDerivedTypeAttr attr);
llvm::DIStringType *translateImpl(DIStringTypeAttr attr);
llvm::DIFile *translateImpl(DIFileAttr attr);
llvm::DILabel *translateImpl(DILabelAttr attr);
llvm::DILexicalBlock *translateImpl(DILexicalBlockAttr attr);
llvm::DILexicalBlockFile *translateImpl(DILexicalBlockFileAttr attr);
llvm::DILocalScope *translateImpl(DILocalScopeAttr attr);
llvm::DILocalVariable *translateImpl(DILocalVariableAttr attr);
llvm::DIGlobalVariable *translateImpl(DIGlobalVariableAttr attr);
llvm::DIVariable *translateImpl(DIVariableAttr attr);
llvm::DIModule *translateImpl(DIModuleAttr attr);
llvm::DINamespace *translateImpl(DINamespaceAttr attr);
llvm::DIScope *translateImpl(DIScopeAttr attr);
llvm::DISubprogram *translateImpl(DISubprogramAttr attr);
llvm::DISubrange *translateImpl(DISubrangeAttr attr);
llvm::DISubroutineType *translateImpl(DISubroutineTypeAttr attr);
llvm::DIType *translateImpl(DITypeAttr attr);
/// Attributes that support self recursion need to implement an additional
/// method to hook into `translateRecursive`.
/// - `<temp llvm type> translateTemporaryImpl(<mlir type>)`:
/// Create a temporary translation of the DI attr without recursively
/// translating any nested DI attrs.
llvm::DIType *translateRecursive(DIRecursiveTypeAttrInterface attr);
/// Translate the given attribute to a temporary llvm debug metadata of the
/// corresponding type.
llvm::TempDICompositeType translateTemporaryImpl(DICompositeTypeAttr attr);
/// Constructs a string metadata node from the string attribute. Returns
/// nullptr if `stringAttr` is null or contains and empty string.
llvm::MDString *getMDStringOrNull(StringAttr stringAttr);
/// Constructs a DIExpression metadata node from the DIExpressionAttr. Returns
/// nullptr if `DIExpressionAttr` is null.
llvm::DIExpression *getExpressionAttrOrNull(DIExpressionAttr attr);
/// A mapping between mlir location+scope and the corresponding llvm debug
/// metadata.
DenseMap<std::tuple<Location, llvm::DILocalScope *, const llvm::DILocation *>,
llvm::DILocation *>
locationToLoc;
/// A mapping between debug attribute and the corresponding llvm debug
/// metadata.
DenseMap<Attribute, llvm::DINode *> attrToNode;
/// A mapping between recursive ID and the translated DIType.
llvm::MapVector<DistinctAttr, llvm::DIType *> recursiveTypeMap;
/// A mapping between a distinct ID and the translated LLVM metadata node.
/// This helps identify attrs that should translate into the same LLVM debug
/// node.
DenseMap<DistinctAttr, llvm::DINode *> distinctAttrToNode;
/// A mapping between filename and llvm debug file.
/// TODO: Change this to DenseMap<Identifier, ...> when we can
/// access the Identifier filename in FileLineColLoc.
llvm::StringMap<llvm::DIFile *> fileMap;
/// A string containing the current working directory of the compiler.
SmallString<256> currentWorkingDir;
/// Flag indicating if debug information should be emitted.
bool debugEmissionIsEnabled;
/// Debug information fields.
llvm::Module &llvmModule;
llvm::LLVMContext &llvmCtx;
};
} // namespace detail
} // namespace LLVM
} // namespace mlir
#endif // MLIR_LIB_TARGET_LLVMIR_DEBUGTRANSLATION_H_
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