1e8dad3bef
Following the discussion from [this thread](https://discourse.llvm.org/t/handling-cyclic-dependencies-in-debug-info/67526/11), this PR adds support for recursive DITypes. This PR adds: 1. DIRecursiveTypeAttrInterface: An interface that DITypeAttrs can implement to indicate that it supports recursion. See full description in code. 2. Importer & exporter support (The only DITypeAttr that implements the interface is DICompositeTypeAttr, so the exporter is only implemented for composites too. There will be two methods that each llvm DI type that supports mutation needs to implement since there's nothing general). --------- Co-authored-by: Tobias Gysi <tobias.gysi@nextsilicon.com>
479 lines
19 KiB
C++
479 lines
19 KiB
C++
//===- DebugTranslation.cpp - MLIR to LLVM Debug conversion ---------------===//
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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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#include "DebugTranslation.h"
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#include "mlir/Dialect/LLVMIR/LLVMDialect.h"
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#include "llvm/ADT/TypeSwitch.h"
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#include "llvm/IR/Metadata.h"
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#include "llvm/IR/Module.h"
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#include "llvm/Support/FileSystem.h"
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#include "llvm/Support/Path.h"
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using namespace mlir;
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using namespace mlir::LLVM;
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using namespace mlir::LLVM::detail;
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/// A utility walker that interrupts if the operation has valid debug
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/// information.
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static WalkResult interruptIfValidLocation(Operation *op) {
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return isa<UnknownLoc>(op->getLoc()) ? WalkResult::advance()
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: WalkResult::interrupt();
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}
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DebugTranslation::DebugTranslation(Operation *module, llvm::Module &llvmModule)
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: debugEmissionIsEnabled(false), llvmModule(llvmModule),
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llvmCtx(llvmModule.getContext()) {
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// If the module has no location information, there is nothing to do.
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if (!module->walk(interruptIfValidLocation).wasInterrupted())
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return;
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debugEmissionIsEnabled = true;
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// TODO: The version information should be encoded on the LLVM module itself,
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// not implicitly set here.
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// Mark this module as having debug information.
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StringRef debugVersionKey = "Debug Info Version";
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if (!llvmModule.getModuleFlag(debugVersionKey))
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llvmModule.addModuleFlag(llvm::Module::Warning, debugVersionKey,
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llvm::DEBUG_METADATA_VERSION);
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if (auto targetTripleAttr = module->getDiscardableAttr(
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LLVM::LLVMDialect::getTargetTripleAttrName())) {
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auto targetTriple =
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llvm::Triple(cast<StringAttr>(targetTripleAttr).getValue());
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if (targetTriple.isKnownWindowsMSVCEnvironment()) {
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// Dwarf debugging files will be generated by default, unless "CodeView"
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// is set explicitly. Windows/MSVC should use CodeView instead.
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llvmModule.addModuleFlag(llvm::Module::Warning, "CodeView", 1);
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}
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}
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}
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/// Finalize the translation of debug information.
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void DebugTranslation::finalize() {}
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/// Translate the debug information for the given function.
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void DebugTranslation::translate(LLVMFuncOp func, llvm::Function &llvmFunc) {
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if (!debugEmissionIsEnabled)
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return;
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// Look for a sub program attached to the function.
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auto spLoc =
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func.getLoc()->findInstanceOf<FusedLocWith<LLVM::DISubprogramAttr>>();
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if (!spLoc)
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return;
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llvmFunc.setSubprogram(translate(spLoc.getMetadata()));
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}
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//===----------------------------------------------------------------------===//
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// Attributes
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//===----------------------------------------------------------------------===//
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llvm::DIType *DebugTranslation::translateImpl(DINullTypeAttr attr) {
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// A DINullTypeAttr at the beginning of the subroutine types list models
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// a void result type. If it is at the end, it models a variadic function.
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// Translate the explicit DINullTypeAttr to a nullptr since LLVM IR metadata
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// does not have an explicit void result type nor a variadic type
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// representation.
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return nullptr;
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}
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llvm::MDString *DebugTranslation::getMDStringOrNull(StringAttr stringAttr) {
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if (!stringAttr || stringAttr.empty())
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return nullptr;
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return llvm::MDString::get(llvmCtx, stringAttr);
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}
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llvm::DIBasicType *DebugTranslation::translateImpl(DIBasicTypeAttr attr) {
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return llvm::DIBasicType::get(
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llvmCtx, attr.getTag(), getMDStringOrNull(attr.getName()),
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attr.getSizeInBits(),
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/*AlignInBits=*/0, attr.getEncoding(), llvm::DINode::FlagZero);
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}
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llvm::DICompileUnit *DebugTranslation::translateImpl(DICompileUnitAttr attr) {
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llvm::DIBuilder builder(llvmModule);
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return builder.createCompileUnit(
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attr.getSourceLanguage(), translate(attr.getFile()),
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attr.getProducer() ? attr.getProducer().getValue() : "",
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attr.getIsOptimized(),
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/*Flags=*/"", /*RV=*/0, /*SplitName=*/{},
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static_cast<llvm::DICompileUnit::DebugEmissionKind>(
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attr.getEmissionKind()));
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}
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/// Returns a new `DINodeT` that is either distinct or not, depending on
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/// `isDistinct`.
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template <class DINodeT, class... Ts>
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static DINodeT *getDistinctOrUnique(bool isDistinct, Ts &&...args) {
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if (isDistinct)
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return DINodeT::getDistinct(std::forward<Ts>(args)...);
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return DINodeT::get(std::forward<Ts>(args)...);
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}
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llvm::DICompositeType *
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DebugTranslation::translateImplGetPlaceholder(DICompositeTypeAttr attr) {
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// TODO: Use distinct attributes to model this, once they have landed.
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// Depending on the tag, composite types must be distinct.
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bool isDistinct = false;
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switch (attr.getTag()) {
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case llvm::dwarf::DW_TAG_class_type:
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case llvm::dwarf::DW_TAG_enumeration_type:
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case llvm::dwarf::DW_TAG_structure_type:
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case llvm::dwarf::DW_TAG_union_type:
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isDistinct = true;
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}
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llvm::TempMDTuple placeholderElements =
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llvm::MDNode::getTemporary(llvmCtx, std::nullopt);
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return getDistinctOrUnique<llvm::DICompositeType>(
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isDistinct, llvmCtx, attr.getTag(), getMDStringOrNull(attr.getName()),
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translate(attr.getFile()), attr.getLine(), translate(attr.getScope()),
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translate(attr.getBaseType()), attr.getSizeInBits(),
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attr.getAlignInBits(),
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/*OffsetInBits=*/0,
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/*Flags=*/static_cast<llvm::DINode::DIFlags>(attr.getFlags()),
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/*Elements=*/placeholderElements.get(), /*RuntimeLang=*/0,
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/*VTableHolder=*/nullptr);
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}
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void DebugTranslation::translateImplFillPlaceholder(
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DICompositeTypeAttr attr, llvm::DICompositeType *placeholder) {
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SmallVector<llvm::Metadata *> elements;
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for (DINodeAttr member : attr.getElements())
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elements.push_back(translate(member));
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placeholder->replaceElements(llvm::MDNode::get(llvmCtx, elements));
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}
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llvm::DICompositeType *
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DebugTranslation::translateImpl(DICompositeTypeAttr attr) {
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llvm::DICompositeType *placeholder = translateImplGetPlaceholder(attr);
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translateImplFillPlaceholder(attr, placeholder);
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return placeholder;
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}
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llvm::DIDerivedType *DebugTranslation::translateImpl(DIDerivedTypeAttr attr) {
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return llvm::DIDerivedType::get(
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llvmCtx, attr.getTag(), getMDStringOrNull(attr.getName()),
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/*File=*/nullptr, /*Line=*/0,
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/*Scope=*/nullptr, translate(attr.getBaseType()), attr.getSizeInBits(),
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attr.getAlignInBits(), attr.getOffsetInBits(),
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/*DWARFAddressSpace=*/std::nullopt, /*Flags=*/llvm::DINode::FlagZero);
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}
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llvm::DIFile *DebugTranslation::translateImpl(DIFileAttr attr) {
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return llvm::DIFile::get(llvmCtx, getMDStringOrNull(attr.getName()),
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getMDStringOrNull(attr.getDirectory()));
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}
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llvm::DILabel *DebugTranslation::translateImpl(DILabelAttr attr) {
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return llvm::DILabel::get(llvmCtx, translate(attr.getScope()),
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getMDStringOrNull(attr.getName()),
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translate(attr.getFile()), attr.getLine());
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}
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llvm::DILexicalBlock *DebugTranslation::translateImpl(DILexicalBlockAttr attr) {
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return llvm::DILexicalBlock::getDistinct(llvmCtx, translate(attr.getScope()),
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translate(attr.getFile()),
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attr.getLine(), attr.getColumn());
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}
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llvm::DILexicalBlockFile *
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DebugTranslation::translateImpl(DILexicalBlockFileAttr attr) {
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return llvm::DILexicalBlockFile::getDistinct(
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llvmCtx, translate(attr.getScope()), translate(attr.getFile()),
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attr.getDiscriminator());
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}
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llvm::DILocalScope *DebugTranslation::translateImpl(DILocalScopeAttr attr) {
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return cast<llvm::DILocalScope>(translate(DINodeAttr(attr)));
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}
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llvm::DILocalVariable *
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DebugTranslation::translateImpl(DILocalVariableAttr attr) {
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return llvm::DILocalVariable::get(
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llvmCtx, translate(attr.getScope()), getMDStringOrNull(attr.getName()),
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translate(attr.getFile()), attr.getLine(), translate(attr.getType()),
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attr.getArg(),
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/*Flags=*/llvm::DINode::FlagZero, attr.getAlignInBits(),
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/*Annotations=*/nullptr);
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}
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llvm::DIGlobalVariable *
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DebugTranslation::translateImpl(DIGlobalVariableAttr attr) {
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return llvm::DIGlobalVariable::getDistinct(
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llvmCtx, translate(attr.getScope()), getMDStringOrNull(attr.getName()),
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getMDStringOrNull(attr.getLinkageName()), translate(attr.getFile()),
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attr.getLine(), translate(attr.getType()), attr.getIsLocalToUnit(),
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attr.getIsDefined(), nullptr, nullptr, attr.getAlignInBits(), nullptr);
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}
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llvm::DIType *
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DebugTranslation::translateRecursive(DIRecursiveTypeAttrInterface attr) {
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DistinctAttr recursiveId = attr.getRecId();
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if (attr.isRecSelf()) {
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auto *iter = recursiveTypeMap.find(recursiveId);
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assert(iter != recursiveTypeMap.end() && "unbound DI recursive self type");
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return iter->second;
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}
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auto setRecursivePlaceholder = [&](llvm::DIType *placeholder) {
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auto [iter, inserted] =
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recursiveTypeMap.try_emplace(recursiveId, placeholder);
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assert(inserted && "illegal reuse of recursive id");
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};
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llvm::DIType *result =
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TypeSwitch<DIRecursiveTypeAttrInterface, llvm::DIType *>(attr)
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.Case<DICompositeTypeAttr>([&](auto attr) {
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auto *placeholder = translateImplGetPlaceholder(attr);
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setRecursivePlaceholder(placeholder);
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translateImplFillPlaceholder(attr, placeholder);
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return placeholder;
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});
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assert(recursiveTypeMap.back().first == recursiveId &&
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"internal inconsistency: unexpected recursive translation stack");
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recursiveTypeMap.pop_back();
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return result;
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}
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llvm::DIScope *DebugTranslation::translateImpl(DIScopeAttr attr) {
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return cast<llvm::DIScope>(translate(DINodeAttr(attr)));
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}
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llvm::DISubprogram *DebugTranslation::translateImpl(DISubprogramAttr attr) {
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if (auto iter = distinctAttrToNode.find(attr.getId());
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iter != distinctAttrToNode.end())
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return cast<llvm::DISubprogram>(iter->second);
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llvm::DIScope *scope = translate(attr.getScope());
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llvm::DIFile *file = translate(attr.getFile());
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llvm::DIType *type = translate(attr.getType());
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llvm::DICompileUnit *compileUnit = translate(attr.getCompileUnit());
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// Check again after recursive calls in case this distinct node recurses back
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// to itself.
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if (auto iter = distinctAttrToNode.find(attr.getId());
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iter != distinctAttrToNode.end())
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return cast<llvm::DISubprogram>(iter->second);
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bool isDefinition = static_cast<bool>(attr.getSubprogramFlags() &
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LLVM::DISubprogramFlags::Definition);
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llvm::DISubprogram *node = getDistinctOrUnique<llvm::DISubprogram>(
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isDefinition, llvmCtx, scope, getMDStringOrNull(attr.getName()),
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getMDStringOrNull(attr.getLinkageName()), file, attr.getLine(), type,
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attr.getScopeLine(),
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/*ContainingType=*/nullptr, /*VirtualIndex=*/0,
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/*ThisAdjustment=*/0, llvm::DINode::FlagZero,
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static_cast<llvm::DISubprogram::DISPFlags>(attr.getSubprogramFlags()),
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compileUnit);
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if (attr.getId())
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distinctAttrToNode.try_emplace(attr.getId(), node);
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return node;
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}
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llvm::DIModule *DebugTranslation::translateImpl(DIModuleAttr attr) {
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return llvm::DIModule::get(
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llvmCtx, translate(attr.getFile()), translate(attr.getScope()),
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getMDStringOrNull(attr.getName()),
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getMDStringOrNull(attr.getConfigMacros()),
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getMDStringOrNull(attr.getIncludePath()),
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getMDStringOrNull(attr.getApinotes()), attr.getLine(), attr.getIsDecl());
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}
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llvm::DINamespace *DebugTranslation::translateImpl(DINamespaceAttr attr) {
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return llvm::DINamespace::get(llvmCtx, translate(attr.getScope()),
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getMDStringOrNull(attr.getName()),
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attr.getExportSymbols());
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}
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llvm::DISubrange *DebugTranslation::translateImpl(DISubrangeAttr attr) {
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auto getMetadataOrNull = [&](IntegerAttr attr) -> llvm::Metadata * {
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if (!attr)
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return nullptr;
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return llvm::ConstantAsMetadata::get(llvm::ConstantInt::getSigned(
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llvm::Type::getInt64Ty(llvmCtx), attr.getInt()));
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};
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return llvm::DISubrange::get(llvmCtx, getMetadataOrNull(attr.getCount()),
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getMetadataOrNull(attr.getLowerBound()),
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getMetadataOrNull(attr.getUpperBound()),
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getMetadataOrNull(attr.getStride()));
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}
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llvm::DISubroutineType *
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DebugTranslation::translateImpl(DISubroutineTypeAttr attr) {
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// Concatenate the result and argument types into a single array.
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SmallVector<llvm::Metadata *> types;
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for (DITypeAttr type : attr.getTypes())
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types.push_back(translate(type));
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return llvm::DISubroutineType::get(
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llvmCtx, llvm::DINode::FlagZero, attr.getCallingConvention(),
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llvm::DITypeRefArray(llvm::MDNode::get(llvmCtx, types)));
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}
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llvm::DIType *DebugTranslation::translateImpl(DITypeAttr attr) {
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return cast<llvm::DIType>(translate(DINodeAttr(attr)));
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}
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llvm::DINode *DebugTranslation::translate(DINodeAttr attr) {
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if (!attr)
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return nullptr;
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// Check for a cached instance.
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if (llvm::DINode *node = attrToNode.lookup(attr))
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return node;
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llvm::DINode *node = nullptr;
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// Recursive types go through a dedicated handler. All other types are
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// dispatched directly to their specific handlers.
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if (auto recTypeAttr = dyn_cast<DIRecursiveTypeAttrInterface>(attr))
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if (recTypeAttr.getRecId())
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node = translateRecursive(recTypeAttr);
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if (!node)
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node = TypeSwitch<DINodeAttr, llvm::DINode *>(attr)
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.Case<DIBasicTypeAttr, DICompileUnitAttr, DICompositeTypeAttr,
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DIDerivedTypeAttr, DIFileAttr, DIGlobalVariableAttr,
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DILabelAttr, DILexicalBlockAttr, DILexicalBlockFileAttr,
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DILocalVariableAttr, DIModuleAttr, DINamespaceAttr,
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DINullTypeAttr, DISubprogramAttr, DISubrangeAttr,
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DISubroutineTypeAttr>(
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[&](auto attr) { return translateImpl(attr); });
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attrToNode.insert({attr, node});
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return node;
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}
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//===----------------------------------------------------------------------===//
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// Locations
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//===----------------------------------------------------------------------===//
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/// Translate the given location to an llvm debug location.
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llvm::DILocation *DebugTranslation::translateLoc(Location loc,
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llvm::DILocalScope *scope) {
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if (!debugEmissionIsEnabled)
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return nullptr;
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return translateLoc(loc, scope, /*inlinedAt=*/nullptr);
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}
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llvm::DIExpression *
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DebugTranslation::translateExpression(LLVM::DIExpressionAttr attr) {
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SmallVector<uint64_t, 1> ops;
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if (attr) {
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// Append operations their operands to the list.
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for (const DIExpressionElemAttr &op : attr.getOperations()) {
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ops.push_back(op.getOpcode());
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append_range(ops, op.getArguments());
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}
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}
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return llvm::DIExpression::get(llvmCtx, ops);
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}
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llvm::DIGlobalVariableExpression *
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DebugTranslation::translateGlobalVariableExpression(
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LLVM::DIGlobalVariableExpressionAttr attr) {
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return llvm::DIGlobalVariableExpression::get(
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llvmCtx, translate(attr.getVar()), translateExpression(attr.getExpr()));
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}
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/// Translate the given location to an llvm DebugLoc.
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llvm::DILocation *DebugTranslation::translateLoc(Location loc,
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llvm::DILocalScope *scope,
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llvm::DILocation *inlinedAt) {
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// LLVM doesn't have a representation for unknown.
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if (isa<UnknownLoc>(loc))
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return nullptr;
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// Check for a cached instance.
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auto existingIt = locationToLoc.find(std::make_tuple(loc, scope, inlinedAt));
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if (existingIt != locationToLoc.end())
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return existingIt->second;
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llvm::DILocation *llvmLoc = nullptr;
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if (auto callLoc = dyn_cast<CallSiteLoc>(loc)) {
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// For callsites, the caller is fed as the inlinedAt for the callee.
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auto *callerLoc = translateLoc(callLoc.getCaller(), scope, inlinedAt);
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llvmLoc = translateLoc(callLoc.getCallee(), nullptr, callerLoc);
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// Fallback: Ignore callee if it has no debug scope.
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if (!llvmLoc)
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llvmLoc = callerLoc;
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} else if (auto fileLoc = dyn_cast<FileLineColLoc>(loc)) {
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// A scope of a DILocation cannot be null.
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if (!scope)
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return nullptr;
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llvmLoc =
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llvm::DILocation::get(llvmCtx, fileLoc.getLine(), fileLoc.getColumn(),
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scope, const_cast<llvm::DILocation *>(inlinedAt));
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} else if (auto fusedLoc = dyn_cast<FusedLoc>(loc)) {
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ArrayRef<Location> locations = fusedLoc.getLocations();
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// Check for a scope encoded with the location.
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if (auto scopedAttr =
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dyn_cast_or_null<LLVM::DILocalScopeAttr>(fusedLoc.getMetadata()))
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scope = translate(scopedAttr);
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// For fused locations, merge each of the nodes.
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llvmLoc = translateLoc(locations.front(), scope, inlinedAt);
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for (Location locIt : locations.drop_front()) {
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llvmLoc = llvm::DILocation::getMergedLocation(
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llvmLoc, translateLoc(locIt, scope, inlinedAt));
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}
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} else if (auto nameLoc = dyn_cast<NameLoc>(loc)) {
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llvmLoc = translateLoc(nameLoc.getChildLoc(), scope, inlinedAt);
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} else if (auto opaqueLoc = dyn_cast<OpaqueLoc>(loc)) {
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llvmLoc = translateLoc(opaqueLoc.getFallbackLocation(), scope, inlinedAt);
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} else {
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llvm_unreachable("unknown location kind");
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}
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locationToLoc.try_emplace(std::make_tuple(loc, scope, inlinedAt), llvmLoc);
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return llvmLoc;
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}
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/// Create an llvm debug file for the given file path.
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llvm::DIFile *DebugTranslation::translateFile(StringRef fileName) {
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auto *&file = fileMap[fileName];
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if (file)
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|
return file;
|
|
|
|
// Make sure the current working directory is up-to-date.
|
|
if (currentWorkingDir.empty())
|
|
llvm::sys::fs::current_path(currentWorkingDir);
|
|
|
|
StringRef directory = currentWorkingDir;
|
|
SmallString<128> dirBuf;
|
|
SmallString<128> fileBuf;
|
|
if (llvm::sys::path::is_absolute(fileName)) {
|
|
// Strip the common prefix (if it is more than just "/") from current
|
|
// directory and FileName for a more space-efficient encoding.
|
|
auto fileIt = llvm::sys::path::begin(fileName);
|
|
auto fileE = llvm::sys::path::end(fileName);
|
|
auto curDirIt = llvm::sys::path::begin(directory);
|
|
auto curDirE = llvm::sys::path::end(directory);
|
|
for (; curDirIt != curDirE && *curDirIt == *fileIt; ++curDirIt, ++fileIt)
|
|
llvm::sys::path::append(dirBuf, *curDirIt);
|
|
if (std::distance(llvm::sys::path::begin(directory), curDirIt) == 1) {
|
|
// Don't strip the common prefix if it is only the root "/" since that
|
|
// would make LLVM diagnostic locations confusing.
|
|
directory = StringRef();
|
|
} else {
|
|
for (; fileIt != fileE; ++fileIt)
|
|
llvm::sys::path::append(fileBuf, *fileIt);
|
|
directory = dirBuf;
|
|
fileName = fileBuf;
|
|
}
|
|
}
|
|
return (file = llvm::DIFile::get(llvmCtx, fileName, directory));
|
|
}
|