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0995a92322
When investigating bugs in PDB generation, the first step is often to do the same link with link.exe and then compare PDBs. But comparing PDBs is hard because two completely different byte sequences can both be correct, so it hampers the investigation when you also have to spend time figuring out not just which bytes are different, but also if the difference is meaningful. This patch fixes a couple of cases related to string table emission, hash table emission, and the order in which we emit strings that makes more of our bytes the same as the bytes generated by MS PDBs. Differential Revision: https://reviews.llvm.org/D44810 git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@328348 91177308-0d34-0410-b5e6-96231b3b80d8
98 lines
2.9 KiB
C++
98 lines
2.9 KiB
C++
//===- DebugStringTableSubsection.h - CodeView String Table -----*- C++ -*-===//
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//
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// The LLVM Compiler Infrastructure
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//
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// This file is distributed under the University of Illinois Open Source
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// License. See LICENSE.TXT for details.
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//
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//===----------------------------------------------------------------------===//
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#ifndef LLVM_DEBUGINFO_CODEVIEW_DEBUGSTRINGTABLESUBSECTION_H
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#define LLVM_DEBUGINFO_CODEVIEW_DEBUGSTRINGTABLESUBSECTION_H
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#include "llvm/ADT/DenseMap.h"
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#include "llvm/ADT/StringMap.h"
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#include "llvm/ADT/StringRef.h"
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#include "llvm/DebugInfo/CodeView/CodeView.h"
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#include "llvm/DebugInfo/CodeView/DebugSubsection.h"
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#include "llvm/Support/BinaryStreamRef.h"
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#include "llvm/Support/Error.h"
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#include <cstdint>
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namespace llvm {
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class BinaryStreamReader;
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namespace codeview {
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/// Represents a read-only view of a CodeView string table. This is a very
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/// simple flat buffer consisting of null-terminated strings, where strings
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/// are retrieved by their offset in the buffer. DebugStringTableSubsectionRef
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/// does not own the underlying storage for the buffer.
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class DebugStringTableSubsectionRef : public DebugSubsectionRef {
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public:
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DebugStringTableSubsectionRef();
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static bool classof(const DebugSubsectionRef *S) {
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return S->kind() == DebugSubsectionKind::StringTable;
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}
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Error initialize(BinaryStreamRef Contents);
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Error initialize(BinaryStreamReader &Reader);
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Expected<StringRef> getString(uint32_t Offset) const;
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bool valid() const { return Stream.valid(); }
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BinaryStreamRef getBuffer() const { return Stream; }
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private:
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BinaryStreamRef Stream;
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};
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/// Represents a read-write view of a CodeView string table.
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/// DebugStringTableSubsection owns the underlying storage for the table, and is
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/// capable of serializing the string table into a format understood by
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/// DebugStringTableSubsectionRef.
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class DebugStringTableSubsection : public DebugSubsection {
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public:
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DebugStringTableSubsection();
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static bool classof(const DebugSubsection *S) {
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return S->kind() == DebugSubsectionKind::StringTable;
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}
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// If string S does not exist in the string table, insert it.
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// Returns the ID for S.
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uint32_t insert(StringRef S);
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// Return the ID for string S. Assumes S exists in the table.
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uint32_t getIdForString(StringRef S) const;
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StringRef getStringForId(uint32_t Id) const;
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uint32_t calculateSerializedSize() const override;
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Error commit(BinaryStreamWriter &Writer) const override;
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uint32_t size() const;
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StringMap<uint32_t>::const_iterator begin() const {
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return StringToId.begin();
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}
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StringMap<uint32_t>::const_iterator end() const { return StringToId.end(); }
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std::vector<uint32_t> sortedIds() const;
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private:
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DenseMap<uint32_t, StringRef> IdToString;
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StringMap<uint32_t> StringToId;
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uint32_t StringSize = 1;
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};
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} // end namespace codeview
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} // end namespace llvm
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#endif // LLVM_DEBUGINFO_CODEVIEW_DEBUGSTRINGTABLESUBSECTION_H
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