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DWARF: Don't crash when looking up an invalid address.

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git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@139846 91177308-0d34-0410-b5e6-96231b3b80d8
This commit is contained in:
Benjamin Kramer 2011-09-15 21:08:54 +00:00
parent b9edad0163
commit f5b0accf43
1 changed files with 6 additions and 0 deletions
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6
lib/DebugInfo/DWARFContext.cpp
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@ -147,13 +147,19 @@ DILineInfo DWARFContext::getLineInfoForAddress(uint64_t address) {
uint32_t cuOffset = getDebugAranges()->offsetAtIndex(arangeIndex);
// Retrieve the compile unit.
DWARFCompileUnit *cu = getCompileUnitForOffset(cuOffset);
if (!cu)
return DILineInfo("<invalid>", 0, 0);
// Get the line table for this compile unit.
const DWARFDebugLine::LineTable *lineTable = getLineTableForCompileUnit(cu);
if (!lineTable)
return DILineInfo("<invalid>", 0, 0);
// Get the index of the row we're looking for in the line table.
uint64_t hiPC =
cu->getCompileUnitDIE()->getAttributeValueAsUnsigned(cu, DW_AT_high_pc,
-1ULL);
uint32_t rowIndex = lineTable->lookupAddress(address, hiPC);
if (rowIndex == -1U)
return DILineInfo("<invalid>", 0, 0);
// From here, contruct the DILineInfo.
const DWARFDebugLine::Row &row = lineTable->Rows[rowIndex];