DWARF: Remove accessors that parse the whole line table section in one go, this can't possibly work.
The address size is specified by the compile unit associated with a line table, there is no global address size.
git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@139835 91177308-0d34-0410-b5e6-96231b3b80d8
diff --git a/lib/DebugInfo/DWARFContext.cpp b/lib/DebugInfo/DWARFContext.cpp
index 184a8b5..36c6d98 100644
--- a/lib/DebugInfo/DWARFContext.cpp
+++ b/lib/DebugInfo/DWARFContext.cpp
@@ -77,15 +77,25 @@
return Aranges.get();
}
-const DWARFDebugLine *DWARFContext::getDebugLine() {
- if (Line)
- return Line.get();
+const DWARFDebugLine::LineTable *
+DWARFContext::getLineTableForCompileUnit(DWARFCompileUnit *cu) {
+ if (!Line)
+ Line.reset(new DWARFDebugLine());
- DataExtractor lineData(getLineSection(), isLittleEndian(), 0);
+ unsigned stmtOffset =
+ cu->getCompileUnitDIE()->getAttributeValueAsUnsigned(cu, DW_AT_stmt_list,
+ -1U);
+ if (stmtOffset == -1U)
+ return 0; // No line table for this compile unit.
- Line.reset(new DWARFDebugLine());
- Line->parse(lineData);
- return Line.get();
+ // See if the line table is cached.
+ if (const DWARFDebugLine::LineTable *lt = Line->getLineTable(stmtOffset))
+ return lt;
+
+ // We have to parse it first.
+ DataExtractor lineData(getLineSection(), isLittleEndian(),
+ cu->getAddressByteSize());
+ return Line->getOrParseLineTable(lineData, stmtOffset);
}
void DWARFContext::parseCompileUnits() {