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There are two ways to map a variable to its lexical scope. Lexical scope information is embedded in MDNode describing the variable. It is also available as a part of DebugLoc attached with DBG_VALUE instruction. DebugLoc attached with an instruction is less reliable in optimized code so use information embedded in the MDNode.

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git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@135629 91177308-0d34-0410-b5e6-96231b3b80d8
This commit is contained in:
Devang Patel
2011-07-20 22:18:50 +00:00
parent 747032522f
commit 40c7e4142e
3 changed files with 18 additions and 2 deletions
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12
lib/CodeGen/AsmPrinter/DwarfDebug.cpp
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@ -1410,8 +1410,16 @@ DwarfDebug::collectVariableInfo(const MachineFunction *MF,
if (DV.getTag() == dwarf::DW_TAG_arg_variable &&
DISubprogram(DV.getContext()).describes(MF->getFunction()))
Scope = CurrentFnDbgScope;
else
Scope = findDbgScope(MInsn->getDebugLoc());
else {
if (DV.getVersion() <= LLVMDebugVersion9)
Scope = findDbgScope(MInsn->getDebugLoc());
else {
if (MDNode *IA = DV.getInlinedAt())
Scope = InlinedDbgScopeMap.lookup(DebugLoc::getFromDILocation(IA));
else
Scope = DbgScopeMap.lookup(cast<MDNode>(DV->getOperand(1)));
}
}
// If variable scope is not found then skip this variable.
if (!Scope)
continue;