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DWARF: avoid unnecessary map lookups.

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git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@140260 91177308-0d34-0410-b5e6-96231b3b80d8
This commit is contained in:
Benjamin Kramer 2011-09-21 17:31:42 +00:00
parent 64ac73bb15
commit 1d13d9ed96
1 changed files with 5 additions and 6 deletions
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11
lib/DebugInfo/DWARFDebugLine.cpp
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@ -116,17 +116,16 @@ DWARFDebugLine::getLineTable(uint32_t offset) const {
const DWARFDebugLine::LineTable *
DWARFDebugLine::getOrParseLineTable(DataExtractor debug_line_data,
uint32_t offset) {
LineTableIter pos = LineTableMap.find(offset);
if (pos == LineTableMap.end()) {
std::pair<LineTableIter, bool> pos =
LineTableMap.insert(LineTableMapTy::value_type(offset, LineTable()));
if (pos.second) {
// Parse and cache the line table for at this offset.
State state;
if (!parseStatementTable(debug_line_data, &offset, state))
return 0;
// FIXME: double lookup.
LineTableMap[offset] = state;
return &LineTableMap[offset];
pos.first->second = state;
}
return &pos->second;
return &pos.first->second;
}
bool