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the debug information individual Decls came from. We've had a metadata infrastructure for a while, which was intended to solve a problem we've since dealt with in a different way. (It was meant to keep track of which definition of an Objective-C class was the "true" definition, but we now find it by searching the symbols for the class symbol.) The metadata is attached to the ExternalASTSource, which means it has a one-to-one correspondence with AST contexts. I've repurposed the metadata infrastructure to hold the object file and DIE offset for the DWARF information corresponding to a Decl. There are methods in ClangASTContext that get and set this metadata, and the ClangASTImporter is capable of tracking down the metadata for Decls that have been copied out of the debug information into the parser's AST context without using any additional memory. To see the metadata, you just have to enable the expression log: - (lldb) log enable lldb expr - and watch the import messages. The high 32 bits of the metadata indicate the index of the object file in its containing DWARFDebugMap; I have also added a log which you can use to track that mapping: - (lldb) log enable dwarf map - This adds 64 bits per Decl, which in my testing hasn't turned out to be very much (debugging Clang produces around 6500 Decls in my tests). To track how much data is being consumed, I've also added a global variable g_TotalSizeOfMetadata which tracks the total number of Decls that have metadata in all active AST contexts. Right now this metadata is enormously useful for tracking down bugs in the debug info parser. In the future I also want to use this information to provide more intelligent error messages instead of printing empty source lines wherever Clang refers to the location where something is defined. llvm-svn: 154634
53 lines
1.5 KiB
C++
53 lines
1.5 KiB
C++
//===-- ClangExternalASTSourceCommon.cpp ------------------------*- 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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#include "lldb/Symbol/ClangExternalASTSourceCommon.h"
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using namespace lldb_private;
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#define ClangExternalASTSourceCommon_MAGIC (0x00112233aabbccddull)
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uint64_t g_TotalSizeOfMetadata = 0;
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ClangExternalASTSourceCommon::ClangExternalASTSourceCommon() : clang::ExternalASTSource()
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{
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m_magic = ClangExternalASTSourceCommon_MAGIC;
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g_TotalSizeOfMetadata += m_metadata.size();
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}
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ClangExternalASTSourceCommon::~ClangExternalASTSourceCommon()
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{
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g_TotalSizeOfMetadata -= m_metadata.size();
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}
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uint64_t ClangExternalASTSourceCommon::GetMetadata (uintptr_t object)
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{
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assert (m_magic == ClangExternalASTSourceCommon_MAGIC);
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return m_metadata[object];
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}
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void ClangExternalASTSourceCommon::SetMetadata (uintptr_t object, uint64_t metadata)
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{
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assert (m_magic == ClangExternalASTSourceCommon_MAGIC);
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uint64_t orig_size = m_metadata.size();
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m_metadata[object] = metadata;
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uint64_t new_size = m_metadata.size();
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g_TotalSizeOfMetadata += (new_size - orig_size);
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}
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bool ClangExternalASTSourceCommon::HasMetadata (uintptr_t object)
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{
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assert (m_magic == ClangExternalASTSourceCommon_MAGIC);
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return m_metadata.find(object) != m_metadata.end();
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}
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