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505c76a926
I tried to run llvm-pdbdump on a very large (~1.5GB) PDB to try and identify show-stopping performance problems. This patch addresses the first such problem. When loading the DBI stream, before anyone has even tried to access a single record, we build an in memory map of every source file for every module. In the particular PDB I was using, this was over 85 million files. Specifically, the complexity is O(m*n) where m is the number of modules and n is the average number of source files (including headers) per module. The whole reason for doing this was so that we could have constant time access to any module and any of its source file lists. However, we can still get O(1) access to the source file list for a given module with a simple O(m) precomputation, and access to the list of modules is already O(1) anyway. So this patches reduces the O(m*n) up-front precomputation to an O(m) one, where n is ~6,500 and n*m is about 85 million in my pathological test case. Differential Revision: https://reviews.llvm.org/D32870 git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@302205 91177308-0d34-0410-b5e6-96231b3b80d8
72 lines
2.0 KiB
C++
72 lines
2.0 KiB
C++
//===- DbiModuleDescriptor.h - PDB module information -----------*- 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_PDB_RAW_DBIMODULEDESCRIPTOR_H
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#define LLVM_DEBUGINFO_PDB_RAW_DBIMODULEDESCRIPTOR_H
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#include "llvm/ADT/StringRef.h"
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#include "llvm/DebugInfo/PDB/Native/RawTypes.h"
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#include "llvm/Support/BinaryStreamArray.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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#include <vector>
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namespace llvm {
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namespace pdb {
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class DbiModuleDescriptor {
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friend class DbiStreamBuilder;
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public:
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DbiModuleDescriptor();
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DbiModuleDescriptor(const DbiModuleDescriptor &Info);
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~DbiModuleDescriptor();
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static Error initialize(BinaryStreamRef Stream, DbiModuleDescriptor &Info);
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bool hasECInfo() const;
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uint16_t getTypeServerIndex() const;
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uint16_t getModuleStreamIndex() const;
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uint32_t getSymbolDebugInfoByteSize() const;
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uint32_t getC11LineInfoByteSize() const;
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uint32_t getC13LineInfoByteSize() const;
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uint32_t getNumberOfFiles() const;
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uint32_t getSourceFileNameIndex() const;
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uint32_t getPdbFilePathNameIndex() const;
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StringRef getModuleName() const;
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StringRef getObjFileName() const;
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uint32_t getRecordLength() const;
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private:
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StringRef ModuleName;
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StringRef ObjFileName;
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const ModuleInfoHeader *Layout = nullptr;
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};
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} // end namespace pdb
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template <> struct VarStreamArrayExtractor<pdb::DbiModuleDescriptor> {
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typedef void ContextType;
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static Error extract(BinaryStreamRef Stream, uint32_t &Length,
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pdb::DbiModuleDescriptor &Info) {
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if (auto EC = pdb::DbiModuleDescriptor::initialize(Stream, Info))
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return EC;
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Length = Info.getRecordLength();
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return Error::success();
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}
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};
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} // end namespace llvm
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#endif // LLVM_DEBUGINFO_PDB_RAW_DBIMODULEDESCRIPTOR_H
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