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If a instruction belongs to another function (and not current function) as per debug info attached with the instruction then ignore the dangling lexical scope of this instruction. Such scopes are unreachable.

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git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@93967 91177308-0d34-0410-b5e6-96231b3b80d8
This commit is contained in:
Devang Patel 2010-01-20 02:05:23 +00:00
parent 221925ecca
commit 42aafd7e57
2 changed files with 40 additions and 4 deletions
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16
lib/CodeGen/AsmPrinter/DwarfDebug.cpp
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@ -2042,10 +2042,18 @@ bool DwarfDebug::extractScopeInformation(MachineFunction *MF) {
// Each scope has first instruction and last instruction to mark beginning
// and end of a scope respectively. Create an inverse map that list scopes
// starts (and ends) with an instruction. One instruction may start (or end)
// multiple scopes.
for (DenseMap<MDNode *, DbgScope *>::iterator DI = DbgScopeMap.begin(),
DE = DbgScopeMap.end(); DI != DE; ++DI) {
DbgScope *S = DI->second;
// multiple scopes. Ignore scopes that are not reachable.
SmallVector<DbgScope *, 4> WorkList;
WorkList.push_back(CurrentFnDbgScope);
while (!WorkList.empty()) {
DbgScope *S = WorkList.back(); WorkList.pop_back();
SmallVector<DbgScope *, 4> &Children = S->getScopes();
if (!Children.empty())
for (SmallVector<DbgScope *, 4>::iterator SI = Children.begin(),
SE = Children.end(); SI != SE; ++SI)
WorkList.push_back(*SI);
if (S->isAbstractScope())
continue;
const MachineInstr *MI = S->getFirstInsn();

28
test/DebugInfo/2010-01-19-DbgScope.ll Normal file
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@ -0,0 +1,28 @@
; RUN: llc -O0 < %s -o /dev/null
; Ignore unreachable scopes.
declare void @foo(i32) noreturn
define i32 @bar() nounwind ssp {
entry:
br i1 undef, label %bb, label %bb11, !dbg !0
bb: ; preds = %entry
call void @foo(i32 0) noreturn nounwind, !dbg !7
unreachable, !dbg !7
bb11: ; preds = %entry
ret i32 1, !dbg !11
}
!0 = metadata !{i32 8647, i32 0, metadata !1, null}
!1 = metadata !{i32 458763, metadata !2} ; [ DW_TAG_lexical_block ]
!2 = metadata !{i32 458798, i32 0, metadata !3, metadata !"bar", metadata !"bar", metadata !"bar", metadata !3, i32 8639, metadata !4, i1 true, i1 true, i32 0, i32 0, null} ; [ DW_TAG_subprogram ]
!3 = metadata !{i32 458769, i32 0, i32 1, metadata !"c-parser.c", metadata !"llvmgcc", metadata !"LLVM build 00", i1 true, i1 false, metadata !"", i32 0} ; [ DW_TAG_compile_unit ]
!4 = metadata !{i32 458773, metadata !3, metadata !"", metadata !3, i32 0, i64 0, i64 0, i64 0, i32 0, null, metadata !5, i32 0} ; [ DW_TAG_subroutine_type ]
!5 = metadata !{metadata !6}
!6 = metadata !{i32 458788, metadata !3, metadata !"char", metadata !3, i32 0, i64 8, i64 8, i64 0, i32 0, i32 6} ; [ DW_TAG_base_type ]
!7 = metadata !{i32 8648, i32 0, metadata !8, null}
!8 = metadata !{i32 458763, metadata !9} ; [ DW_TAG_lexical_block ]
!9 = metadata !{i32 458763, metadata !10} ; [ DW_TAG_lexical_block ]
!10 = metadata !{i32 458798, i32 0, metadata !3, metadata !"bar2", metadata !"bar2", metadata !"bar2", metadata !3, i32 8639, metadata !4, i1 true, i1 true, i32 0, i32 0, null} ; [ DW_TAG_subprogram ]
!11 = metadata !{i32 8652, i32 0, metadata !1, null}