eab62971cd
This commit ensures that we model DI information for global constants correctly. These constructs can lack scopes, names, and linkage names, so these parameters were made optional for the DIGlobalVariable attribute.
331 lines
14 KiB
C++
331 lines
14 KiB
C++
//===- DebugImporter.cpp - LLVM to MLIR 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 "DebugImporter.h"
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#include "mlir/Dialect/LLVMIR/LLVMAttrs.h"
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#include "mlir/IR/Attributes.h"
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#include "mlir/IR/BuiltinAttributes.h"
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#include "mlir/IR/Location.h"
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#include "llvm/ADT/STLExtras.h"
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#include "llvm/ADT/ScopeExit.h"
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#include "llvm/BinaryFormat/Dwarf.h"
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#include "llvm/IR/Constants.h"
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#include "llvm/IR/DebugInfoMetadata.h"
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#include "llvm/IR/Metadata.h"
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#include "llvm/Support/Casting.h"
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#include "llvm/Support/ErrorHandling.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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Location DebugImporter::translateFuncLocation(llvm::Function *func) {
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llvm::DISubprogram *subprogram = func->getSubprogram();
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if (!subprogram)
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return UnknownLoc::get(context);
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// Add a fused location to link the subprogram information.
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StringAttr funcName = StringAttr::get(context, subprogram->getName());
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StringAttr fileName = StringAttr::get(context, subprogram->getFilename());
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return FusedLocWith<DISubprogramAttr>::get(
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{NameLoc::get(funcName),
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FileLineColLoc::get(fileName, subprogram->getLine(), /*column=*/0)},
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translate(subprogram), context);
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}
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//===----------------------------------------------------------------------===//
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// Attributes
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//===----------------------------------------------------------------------===//
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DIBasicTypeAttr DebugImporter::translateImpl(llvm::DIBasicType *node) {
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return DIBasicTypeAttr::get(context, node->getTag(), node->getName(),
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node->getSizeInBits(), node->getEncoding());
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}
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DICompileUnitAttr DebugImporter::translateImpl(llvm::DICompileUnit *node) {
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std::optional<DIEmissionKind> emissionKind =
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symbolizeDIEmissionKind(node->getEmissionKind());
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return DICompileUnitAttr::get(context, node->getSourceLanguage(),
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translate(node->getFile()),
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getStringAttrOrNull(node->getRawProducer()),
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node->isOptimized(), emissionKind.value());
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}
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DICompositeTypeAttr DebugImporter::translateImpl(llvm::DICompositeType *node) {
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std::optional<DIFlags> flags = symbolizeDIFlags(node->getFlags());
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SmallVector<DINodeAttr> elements;
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for (llvm::DINode *element : node->getElements()) {
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assert(element && "expected a non-null element type");
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elements.push_back(translate(element));
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}
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// Drop the elements parameter if a cyclic dependency is detected. We
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// currently cannot model these cycles and thus drop the parameter if
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// required. A cyclic dependency is detected if one of the element nodes
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// translates to a nullptr since the node is already on the translation stack.
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// TODO: Support debug metadata with cyclic dependencies.
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if (llvm::is_contained(elements, nullptr))
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elements.clear();
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DITypeAttr baseType = translate(node->getBaseType());
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// Arrays require a base type, otherwise the debug metadata is considered to
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// be malformed.
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if (node->getTag() == llvm::dwarf::DW_TAG_array_type && !baseType)
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return nullptr;
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return DICompositeTypeAttr::get(
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context, node->getTag(), getStringAttrOrNull(node->getRawName()),
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translate(node->getFile()), node->getLine(), translate(node->getScope()),
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baseType, flags.value_or(DIFlags::Zero), node->getSizeInBits(),
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node->getAlignInBits(), elements);
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}
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DIDerivedTypeAttr DebugImporter::translateImpl(llvm::DIDerivedType *node) {
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// Return nullptr if the base type is a cyclic dependency.
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DITypeAttr baseType = translate(node->getBaseType());
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if (node->getBaseType() && !baseType)
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return nullptr;
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return DIDerivedTypeAttr::get(
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context, node->getTag(), getStringAttrOrNull(node->getRawName()),
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baseType, node->getSizeInBits(), node->getAlignInBits(),
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node->getOffsetInBits());
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}
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DIFileAttr DebugImporter::translateImpl(llvm::DIFile *node) {
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return DIFileAttr::get(context, node->getFilename(), node->getDirectory());
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}
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DILabelAttr DebugImporter::translateImpl(llvm::DILabel *node) {
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return DILabelAttr::get(context, translate(node->getScope()),
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getStringAttrOrNull(node->getRawName()),
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translate(node->getFile()), node->getLine());
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}
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DILexicalBlockAttr DebugImporter::translateImpl(llvm::DILexicalBlock *node) {
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return DILexicalBlockAttr::get(context, translate(node->getScope()),
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translate(node->getFile()), node->getLine(),
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node->getColumn());
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}
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DILexicalBlockFileAttr
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DebugImporter::translateImpl(llvm::DILexicalBlockFile *node) {
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return DILexicalBlockFileAttr::get(context, translate(node->getScope()),
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translate(node->getFile()),
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node->getDiscriminator());
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}
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DIGlobalVariableAttr
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DebugImporter::translateImpl(llvm::DIGlobalVariable *node) {
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// Names of DIGlobalVariables can be empty. MLIR models them as null, instead
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// of empty strings, so this special handling is necessary.
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auto convertToStringAttr = [&](StringRef name) -> StringAttr {
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if (name.empty())
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return {};
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return StringAttr::get(context, node->getName());
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};
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return DIGlobalVariableAttr::get(
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context, translate(node->getScope()),
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convertToStringAttr(node->getName()),
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convertToStringAttr(node->getLinkageName()), translate(node->getFile()),
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node->getLine(), translate(node->getType()), node->isLocalToUnit(),
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node->isDefinition(), node->getAlignInBits());
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}
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DILocalVariableAttr DebugImporter::translateImpl(llvm::DILocalVariable *node) {
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return DILocalVariableAttr::get(context, translate(node->getScope()),
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getStringAttrOrNull(node->getRawName()),
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translate(node->getFile()), node->getLine(),
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node->getArg(), node->getAlignInBits(),
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translate(node->getType()));
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}
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DIScopeAttr DebugImporter::translateImpl(llvm::DIScope *node) {
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return cast<DIScopeAttr>(translate(static_cast<llvm::DINode *>(node)));
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}
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DIModuleAttr DebugImporter::translateImpl(llvm::DIModule *node) {
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return DIModuleAttr::get(
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context, translate(node->getFile()), translate(node->getScope()),
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getStringAttrOrNull(node->getRawName()),
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getStringAttrOrNull(node->getRawConfigurationMacros()),
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getStringAttrOrNull(node->getRawIncludePath()),
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getStringAttrOrNull(node->getRawAPINotesFile()), node->getLineNo(),
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node->getIsDecl());
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}
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DINamespaceAttr DebugImporter::translateImpl(llvm::DINamespace *node) {
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return DINamespaceAttr::get(context, getStringAttrOrNull(node->getRawName()),
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translate(node->getScope()),
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node->getExportSymbols());
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}
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DISubprogramAttr DebugImporter::translateImpl(llvm::DISubprogram *node) {
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std::optional<DISubprogramFlags> subprogramFlags =
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symbolizeDISubprogramFlags(node->getSubprogram()->getSPFlags());
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// Return nullptr if the scope or type is a cyclic dependency.
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DIScopeAttr scope = translate(node->getScope());
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if (node->getScope() && !scope)
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return nullptr;
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DISubroutineTypeAttr type = translate(node->getType());
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if (node->getType() && !type)
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return nullptr;
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return DISubprogramAttr::get(context, translate(node->getUnit()), scope,
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getStringAttrOrNull(node->getRawName()),
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getStringAttrOrNull(node->getRawLinkageName()),
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translate(node->getFile()), node->getLine(),
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node->getScopeLine(), subprogramFlags.value(),
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type);
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}
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DISubrangeAttr DebugImporter::translateImpl(llvm::DISubrange *node) {
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auto getIntegerAttrOrNull = [&](llvm::DISubrange::BoundType data) {
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if (auto *constInt = llvm::dyn_cast_or_null<llvm::ConstantInt *>(data))
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return IntegerAttr::get(IntegerType::get(context, 64),
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constInt->getSExtValue());
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return IntegerAttr();
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};
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IntegerAttr count = getIntegerAttrOrNull(node->getCount());
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IntegerAttr upperBound = getIntegerAttrOrNull(node->getUpperBound());
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// Either count or the upper bound needs to be present. Otherwise, the
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// metadata is invalid. The conversion might fail due to unsupported DI nodes.
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if (!count && !upperBound)
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return {};
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return DISubrangeAttr::get(
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context, count, getIntegerAttrOrNull(node->getLowerBound()), upperBound,
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getIntegerAttrOrNull(node->getStride()));
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}
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DISubroutineTypeAttr
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DebugImporter::translateImpl(llvm::DISubroutineType *node) {
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SmallVector<DITypeAttr> types;
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for (llvm::DIType *type : node->getTypeArray()) {
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if (!type) {
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// A nullptr entry may appear at the beginning or the end of the
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// subroutine types list modeling either a void result type or the type of
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// a variadic argument. Translate the nullptr to an explicit
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// DINullTypeAttr since the attribute list cannot contain a nullptr entry.
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types.push_back(DINullTypeAttr::get(context));
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continue;
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}
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types.push_back(translate(type));
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}
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// Return nullptr if any of the types is a cyclic dependency.
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if (llvm::is_contained(types, nullptr))
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return nullptr;
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return DISubroutineTypeAttr::get(context, node->getCC(), types);
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}
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DITypeAttr DebugImporter::translateImpl(llvm::DIType *node) {
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return cast<DITypeAttr>(translate(static_cast<llvm::DINode *>(node)));
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}
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DINodeAttr DebugImporter::translate(llvm::DINode *node) {
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if (!node)
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return nullptr;
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// Check for a cached instance.
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if (DINodeAttr attr = nodeToAttr.lookup(node))
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return attr;
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// Return nullptr if a cyclic dependency is detected since the same node is
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// being traversed twice. This check avoids infinite recursion if the debug
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// metadata contains cycles.
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if (!translationStack.insert(node))
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return nullptr;
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auto guard = llvm::make_scope_exit([&]() { translationStack.pop_back(); });
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// Convert the debug metadata if possible.
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auto translateNode = [this](llvm::DINode *node) -> DINodeAttr {
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if (auto *casted = dyn_cast<llvm::DIBasicType>(node))
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return translateImpl(casted);
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if (auto *casted = dyn_cast<llvm::DICompileUnit>(node))
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return translateImpl(casted);
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if (auto *casted = dyn_cast<llvm::DICompositeType>(node))
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return translateImpl(casted);
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if (auto *casted = dyn_cast<llvm::DIDerivedType>(node))
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return translateImpl(casted);
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if (auto *casted = dyn_cast<llvm::DIFile>(node))
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return translateImpl(casted);
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if (auto *casted = dyn_cast<llvm::DIGlobalVariable>(node))
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return translateImpl(casted);
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if (auto *casted = dyn_cast<llvm::DILabel>(node))
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return translateImpl(casted);
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if (auto *casted = dyn_cast<llvm::DILexicalBlock>(node))
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return translateImpl(casted);
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if (auto *casted = dyn_cast<llvm::DILexicalBlockFile>(node))
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return translateImpl(casted);
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if (auto *casted = dyn_cast<llvm::DILocalVariable>(node))
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return translateImpl(casted);
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if (auto *casted = dyn_cast<llvm::DIModule>(node))
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return translateImpl(casted);
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if (auto *casted = dyn_cast<llvm::DINamespace>(node))
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return translateImpl(casted);
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if (auto *casted = dyn_cast<llvm::DISubprogram>(node))
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return translateImpl(casted);
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if (auto *casted = dyn_cast<llvm::DISubrange>(node))
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return translateImpl(casted);
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if (auto *casted = dyn_cast<llvm::DISubroutineType>(node))
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return translateImpl(casted);
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return nullptr;
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};
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if (DINodeAttr attr = translateNode(node)) {
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nodeToAttr.insert({node, attr});
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return attr;
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}
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return nullptr;
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}
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//===----------------------------------------------------------------------===//
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// Locations
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//===----------------------------------------------------------------------===//
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Location DebugImporter::translateLoc(llvm::DILocation *loc) {
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if (!loc)
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return UnknownLoc::get(context);
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// Get the file location of the instruction.
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Location result = FileLineColLoc::get(context, loc->getFilename(),
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loc->getLine(), loc->getColumn());
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// Add scope information.
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assert(loc->getScope() && "expected non-null scope");
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result = FusedLocWith<DIScopeAttr>::get({result}, translate(loc->getScope()),
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context);
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// Add call site information, if available.
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if (llvm::DILocation *inlinedAt = loc->getInlinedAt())
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result = CallSiteLoc::get(result, translateLoc(inlinedAt));
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return result;
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}
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DIExpressionAttr DebugImporter::translateExpression(llvm::DIExpression *node) {
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SmallVector<DIExpressionElemAttr> ops;
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// Begin processing the operations.
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for (const llvm::DIExpression::ExprOperand &op : node->expr_ops()) {
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SmallVector<uint64_t> operands;
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operands.reserve(op.getNumArgs());
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for (const auto &i : llvm::seq(op.getNumArgs()))
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operands.push_back(op.getArg(i));
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const auto attr = DIExpressionElemAttr::get(context, op.getOp(), operands);
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ops.push_back(attr);
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}
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return DIExpressionAttr::get(context, ops);
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}
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DIGlobalVariableExpressionAttr DebugImporter::translateGlobalVariableExpression(
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llvm::DIGlobalVariableExpression *node) {
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return DIGlobalVariableExpressionAttr::get(
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context, translate(node->getVariable()),
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translateExpression(node->getExpression()));
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}
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StringAttr DebugImporter::getStringAttrOrNull(llvm::MDString *stringNode) {
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if (!stringNode)
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return StringAttr();
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return StringAttr::get(context, stringNode->getString());
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}
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