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Diffstat (limited to 'llvm/tools/dsymutil/DeclContext.cpp')
| -rw-r--r-- | llvm/tools/dsymutil/DeclContext.cpp | 210 |
1 files changed, 0 insertions, 210 deletions
diff --git a/llvm/tools/dsymutil/DeclContext.cpp b/llvm/tools/dsymutil/DeclContext.cpp deleted file mode 100644 index 1c33b672c26..00000000000 --- a/llvm/tools/dsymutil/DeclContext.cpp +++ /dev/null @@ -1,210 +0,0 @@ -//===- tools/dsymutil/DeclContext.cpp - Declaration context ---------------===// -// -// 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 "DeclContext.h" -#include "llvm/DebugInfo/DWARF/DWARFContext.h" -#include "llvm/DebugInfo/DWARF/DWARFDie.h" -#include "llvm/DebugInfo/DWARF/DWARFUnit.h" - -namespace llvm { -namespace dsymutil { - -/// Set the last DIE/CU a context was seen in and, possibly invalidate the -/// context if it is ambiguous. -/// -/// In the current implementation, we don't handle overloaded functions well, -/// because the argument types are not taken into account when computing the -/// DeclContext tree. -/// -/// Some of this is mitigated byt using mangled names that do contain the -/// arguments types, but sometimes (e.g. with function templates) we don't have -/// that. In that case, just do not unique anything that refers to the contexts -/// we are not able to distinguish. -/// -/// If a context that is not a namespace appears twice in the same CU, we know -/// it is ambiguous. Make it invalid. -bool DeclContext::setLastSeenDIE(CompileUnit &U, const DWARFDie &Die) { - if (LastSeenCompileUnitID == U.getUniqueID()) { - DWARFUnit &OrigUnit = U.getOrigUnit(); - uint32_t FirstIdx = OrigUnit.getDIEIndex(LastSeenDIE); - U.getInfo(FirstIdx).Ctxt = nullptr; - return false; - } - - LastSeenCompileUnitID = U.getUniqueID(); - LastSeenDIE = Die; - return true; -} - -PointerIntPair<DeclContext *, 1> DeclContextTree::getChildDeclContext( - DeclContext &Context, const DWARFDie &DIE, CompileUnit &U, - UniquingStringPool &StringPool, bool InClangModule) { - unsigned Tag = DIE.getTag(); - - // FIXME: dsymutil-classic compat: We should bail out here if we - // have a specification or an abstract_origin. We will get the - // parent context wrong here. - - switch (Tag) { - default: - // By default stop gathering child contexts. - return PointerIntPair<DeclContext *, 1>(nullptr); - case dwarf::DW_TAG_module: - break; - case dwarf::DW_TAG_compile_unit: - return PointerIntPair<DeclContext *, 1>(&Context); - case dwarf::DW_TAG_subprogram: - // Do not unique anything inside CU local functions. - if ((Context.getTag() == dwarf::DW_TAG_namespace || - Context.getTag() == dwarf::DW_TAG_compile_unit) && - !dwarf::toUnsigned(DIE.find(dwarf::DW_AT_external), 0)) - return PointerIntPair<DeclContext *, 1>(nullptr); - LLVM_FALLTHROUGH; - case dwarf::DW_TAG_member: - case dwarf::DW_TAG_namespace: - case dwarf::DW_TAG_structure_type: - case dwarf::DW_TAG_class_type: - case dwarf::DW_TAG_union_type: - case dwarf::DW_TAG_enumeration_type: - case dwarf::DW_TAG_typedef: - // Artificial things might be ambiguous, because they might be created on - // demand. For example implicitly defined constructors are ambiguous - // because of the way we identify contexts, and they won't be generated - // every time everywhere. - if (dwarf::toUnsigned(DIE.find(dwarf::DW_AT_artificial), 0)) - return PointerIntPair<DeclContext *, 1>(nullptr); - break; - } - - const char *Name = DIE.getName(DINameKind::LinkageName); - const char *ShortName = DIE.getName(DINameKind::ShortName); - StringRef NameRef; - StringRef ShortNameRef; - StringRef FileRef; - - if (Name) - NameRef = StringPool.internString(Name); - else if (Tag == dwarf::DW_TAG_namespace) - // FIXME: For dsymutil-classic compatibility. I think uniquing within - // anonymous namespaces is wrong. There is no ODR guarantee there. - NameRef = StringPool.internString("(anonymous namespace)"); - - if (ShortName && ShortName != Name) - ShortNameRef = StringPool.internString(ShortName); - else - ShortNameRef = NameRef; - - if (Tag != dwarf::DW_TAG_class_type && Tag != dwarf::DW_TAG_structure_type && - Tag != dwarf::DW_TAG_union_type && - Tag != dwarf::DW_TAG_enumeration_type && NameRef.empty()) - return PointerIntPair<DeclContext *, 1>(nullptr); - - unsigned Line = 0; - unsigned ByteSize = std::numeric_limits<uint32_t>::max(); - - if (!InClangModule) { - // Gather some discriminating data about the DeclContext we will be - // creating: File, line number and byte size. This shouldn't be necessary, - // because the ODR is just about names, but given that we do some - // approximations with overloaded functions and anonymous namespaces, use - // these additional data points to make the process safer. - // - // This is disabled for clang modules, because forward declarations of - // module-defined types do not have a file and line. - ByteSize = dwarf::toUnsigned(DIE.find(dwarf::DW_AT_byte_size), - std::numeric_limits<uint64_t>::max()); - if (Tag != dwarf::DW_TAG_namespace || !Name) { - if (unsigned FileNum = - dwarf::toUnsigned(DIE.find(dwarf::DW_AT_decl_file), 0)) { - if (const auto *LT = U.getOrigUnit().getContext().getLineTableForUnit( - &U.getOrigUnit())) { - // FIXME: dsymutil-classic compatibility. I'd rather not - // unique anything in anonymous namespaces, but if we do, then - // verify that the file and line correspond. - if (!Name && Tag == dwarf::DW_TAG_namespace) - FileNum = 1; - - if (LT->hasFileAtIndex(FileNum)) { - Line = dwarf::toUnsigned(DIE.find(dwarf::DW_AT_decl_line), 0); - // Cache the resolved paths based on the index in the line table, - // because calling realpath is expansive. - StringRef ResolvedPath = U.getResolvedPath(FileNum); - if (!ResolvedPath.empty()) { - FileRef = ResolvedPath; - } else { - std::string File; - bool FoundFileName = LT->getFileNameByIndex( - FileNum, U.getOrigUnit().getCompilationDir(), - DILineInfoSpecifier::FileLineInfoKind::AbsoluteFilePath, - File); - (void)FoundFileName; - assert(FoundFileName && "Must get file name from line table"); - // Second level of caching, this time based on the file's parent - // path. - FileRef = PathResolver.resolve(File, StringPool); - U.setResolvedPath(FileNum, FileRef); - } - } - } - } - } - } - - if (!Line && NameRef.empty()) - return PointerIntPair<DeclContext *, 1>(nullptr); - - // We hash NameRef, which is the mangled name, in order to get most - // overloaded functions resolve correctly. - // - // Strictly speaking, hashing the Tag is only necessary for a - // DW_TAG_module, to prevent uniquing of a module and a namespace - // with the same name. - // - // FIXME: dsymutil-classic won't unique the same type presented - // once as a struct and once as a class. Using the Tag in the fully - // qualified name hash to get the same effect. - unsigned Hash = hash_combine(Context.getQualifiedNameHash(), Tag, NameRef); - - // FIXME: dsymutil-classic compatibility: when we don't have a name, - // use the filename. - if (Tag == dwarf::DW_TAG_namespace && NameRef == "(anonymous namespace)") - Hash = hash_combine(Hash, FileRef); - - // Now look if this context already exists. - DeclContext Key(Hash, Line, ByteSize, Tag, NameRef, FileRef, Context); - auto ContextIter = Contexts.find(&Key); - - if (ContextIter == Contexts.end()) { - // The context wasn't found. - bool Inserted; - DeclContext *NewContext = - new (Allocator) DeclContext(Hash, Line, ByteSize, Tag, NameRef, FileRef, - Context, DIE, U.getUniqueID()); - std::tie(ContextIter, Inserted) = Contexts.insert(NewContext); - assert(Inserted && "Failed to insert DeclContext"); - (void)Inserted; - } else if (Tag != dwarf::DW_TAG_namespace && - !(*ContextIter)->setLastSeenDIE(U, DIE)) { - // The context was found, but it is ambiguous with another context - // in the same file. Mark it invalid. - return PointerIntPair<DeclContext *, 1>(*ContextIter, /* Invalid= */ 1); - } - - assert(ContextIter != Contexts.end()); - // FIXME: dsymutil-classic compatibility. Union types aren't - // uniques, but their children might be. - if ((Tag == dwarf::DW_TAG_subprogram && - Context.getTag() != dwarf::DW_TAG_structure_type && - Context.getTag() != dwarf::DW_TAG_class_type) || - (Tag == dwarf::DW_TAG_union_type)) - return PointerIntPair<DeclContext *, 1>(*ContextIter, /* Invalid= */ 1); - - return PointerIntPair<DeclContext *, 1>(*ContextIter); -} -} // namespace dsymutil -} // namespace llvm |
