3790029d97
Previously we would create these for local variables but not for global variables. Also updated existing tests which created global variables to check for them in the resulting AST. llvm-svn: 349854
209 lines
7.3 KiB
C++
209 lines
7.3 KiB
C++
//===-- PdbIndex.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 "PdbIndex.h"
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#include "PdbUtil.h"
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#include "llvm/DebugInfo/CodeView/SymbolDeserializer.h"
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#include "llvm/DebugInfo/PDB/Native/DbiStream.h"
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#include "llvm/DebugInfo/PDB/Native/GlobalsStream.h"
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#include "llvm/DebugInfo/PDB/Native/ISectionContribVisitor.h"
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#include "llvm/DebugInfo/PDB/Native/PDBFile.h"
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#include "llvm/DebugInfo/PDB/Native/PublicsStream.h"
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#include "llvm/DebugInfo/PDB/Native/SymbolStream.h"
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#include "llvm/DebugInfo/PDB/Native/TpiStream.h"
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#include "llvm/Object/COFF.h"
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#include "llvm/Support/Error.h"
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#include "lldb/Utility/LLDBAssert.h"
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#include "lldb/lldb-defines.h"
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using namespace lldb_private;
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using namespace lldb_private::npdb;
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using namespace llvm::codeview;
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using namespace llvm::pdb;
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PdbIndex::PdbIndex() : m_cus(*this), m_va_to_modi(m_allocator) {}
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#define ASSIGN_PTR_OR_RETURN(result_ptr, expr) \
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{ \
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auto expected_result = expr; \
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if (!expected_result) \
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return expected_result.takeError(); \
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result_ptr = &expected_result.get(); \
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}
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llvm::Expected<std::unique_ptr<PdbIndex>>
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PdbIndex::create(std::unique_ptr<llvm::pdb::PDBFile> file) {
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lldbassert(file);
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std::unique_ptr<PdbIndex> result(new PdbIndex());
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ASSIGN_PTR_OR_RETURN(result->m_dbi, file->getPDBDbiStream());
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ASSIGN_PTR_OR_RETURN(result->m_tpi, file->getPDBTpiStream());
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ASSIGN_PTR_OR_RETURN(result->m_ipi, file->getPDBIpiStream());
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ASSIGN_PTR_OR_RETURN(result->m_info, file->getPDBInfoStream());
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ASSIGN_PTR_OR_RETURN(result->m_publics, file->getPDBPublicsStream());
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ASSIGN_PTR_OR_RETURN(result->m_globals, file->getPDBGlobalsStream());
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ASSIGN_PTR_OR_RETURN(result->m_symrecords, file->getPDBSymbolStream());
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result->m_tpi->buildHashMap();
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result->m_file = std::move(file);
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return std::move(result);
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}
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lldb::addr_t PdbIndex::MakeVirtualAddress(uint16_t segment,
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uint32_t offset) const {
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// Segment indices are 1-based.
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lldbassert(segment > 0);
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uint32_t max_section = dbi().getSectionHeaders().size();
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lldbassert(segment <= max_section + 1);
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// If this is an absolute symbol, it's indicated by the magic section index
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// |max_section+1|. In this case, the offset is meaningless, so just return.
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if (segment == max_section + 1)
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return LLDB_INVALID_ADDRESS;
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const llvm::object::coff_section &cs = dbi().getSectionHeaders()[segment - 1];
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return m_load_address + static_cast<lldb::addr_t>(cs.VirtualAddress) +
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static_cast<lldb::addr_t>(offset);
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}
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lldb::addr_t PdbIndex::MakeVirtualAddress(const SegmentOffset &so) const {
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return MakeVirtualAddress(so.segment, so.offset);
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}
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llvm::Optional<uint16_t>
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PdbIndex::GetModuleIndexForAddr(uint16_t segment, uint32_t offset) const {
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return GetModuleIndexForVa(MakeVirtualAddress(segment, offset));
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}
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llvm::Optional<uint16_t> PdbIndex::GetModuleIndexForVa(lldb::addr_t va) const {
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auto iter = m_va_to_modi.find(va);
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if (iter == m_va_to_modi.end())
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return llvm::None;
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return iter.value();
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}
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void PdbIndex::ParseSectionContribs() {
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class Visitor : public ISectionContribVisitor {
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PdbIndex &m_ctx;
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llvm::IntervalMap<uint64_t, uint16_t> &m_imap;
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public:
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Visitor(PdbIndex &ctx, llvm::IntervalMap<uint64_t, uint16_t> &imap)
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: m_ctx(ctx), m_imap(imap) {}
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void visit(const SectionContrib &C) override {
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if (C.Size == 0)
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return;
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uint64_t va = m_ctx.MakeVirtualAddress(C.ISect, C.Off);
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uint64_t end = va + C.Size;
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// IntervalMap's start and end represent a closed range, not a half-open
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// range, so we have to subtract 1.
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m_imap.insert(va, end - 1, C.Imod);
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}
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void visit(const SectionContrib2 &C) override { visit(C.Base); }
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};
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Visitor v(*this, m_va_to_modi);
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dbi().visitSectionContributions(v);
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}
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void PdbIndex::BuildAddrToSymbolMap(CompilandIndexItem &cci) {
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lldbassert(cci.m_symbols_by_va.empty() &&
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"Addr to symbol map is already built!");
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uint16_t modi = cci.m_id.modi;
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const CVSymbolArray &syms = cci.m_debug_stream.getSymbolArray();
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for (auto iter = syms.begin(); iter != syms.end(); ++iter) {
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if (!SymbolHasAddress(*iter))
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continue;
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SegmentOffset so = GetSegmentAndOffset(*iter);
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lldb::addr_t va = MakeVirtualAddress(so);
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PdbCompilandSymId cu_sym_id(modi, iter.offset());
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// If the debug info is incorrect, we could have multiple symbols with the
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// same address. So use try_emplace instead of insert, and the first one
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// will win.
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auto insert_result =
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cci.m_symbols_by_va.insert(std::make_pair(va, PdbSymUid(cu_sym_id)));
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(void)insert_result;
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// The odds of an error in some function such as GetSegmentAndOffset or
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// MakeVirtualAddress are much higher than the odds of encountering bad
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// debug info, so assert that this item was inserted in the map as opposed
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// to having already been there.
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lldbassert(insert_result.second);
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}
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}
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std::vector<SymbolAndUid> PdbIndex::FindSymbolsByVa(lldb::addr_t va) {
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std::vector<SymbolAndUid> result;
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llvm::Optional<uint16_t> modi = GetModuleIndexForVa(va);
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if (!modi)
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return result;
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CompilandIndexItem &cci = compilands().GetOrCreateCompiland(*modi);
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if (cci.m_symbols_by_va.empty())
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BuildAddrToSymbolMap(cci);
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// The map is sorted by starting address of the symbol. So for example
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// we could (in theory) have this situation
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//
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// [------------------]
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// [----------]
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// [-----------]
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// [-------------]
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// [----]
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// [-----]
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// ^ Address we're searching for
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// In order to find this, we use the upper_bound of the key value which would
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// be the first symbol whose starting address is higher than the element we're
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// searching for.
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auto ub = cci.m_symbols_by_va.upper_bound(va);
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for (auto iter = cci.m_symbols_by_va.begin(); iter != ub; ++iter) {
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PdbCompilandSymId cu_sym_id = iter->second.asCompilandSym();
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CVSymbol sym = ReadSymbolRecord(cu_sym_id);
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SegmentOffsetLength sol;
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if (SymbolIsCode(sym))
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sol = GetSegmentOffsetAndLength(sym);
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else
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sol.so = GetSegmentAndOffset(sym);
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lldb::addr_t start = MakeVirtualAddress(sol.so);
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lldb::addr_t end = start + sol.length;
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if (va >= start && va < end)
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result.push_back({std::move(sym), iter->second});
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}
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return result;
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}
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CVSymbol PdbIndex::ReadSymbolRecord(PdbCompilandSymId cu_sym) const {
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// We need to subtract 4 here to adjust for the codeview debug magic
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// at the beginning of the debug info stream.
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const CompilandIndexItem *cci = compilands().GetCompiland(cu_sym.modi);
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auto iter = cci->m_debug_stream.getSymbolArray().at(cu_sym.offset);
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lldbassert(iter != cci->m_debug_stream.getSymbolArray().end());
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return *iter;
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}
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CVSymbol PdbIndex::ReadSymbolRecord(PdbGlobalSymId global) const {
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return symrecords().readRecord(global.offset);
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}
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