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27b6b3117f
In 2010 a commit with no testcase and no further explanation explicitly disabled the handling of inlined variables in EmitFuncArgumentDbgValue(). I don't think there is a good reason for this any more and re-enabling this adds debug locations for variables associated with an LLVM function argument in functions that are inlined into the first basic block. The only downside of doing this is that we may insert a DBG_VALUE before the inlined scope, but (1) this could be filtered out later, and (2) LiveDebugValues will not propagate it into subsequent basic blocks if they don't dominate the variable's lexical scope, so this seems like a small price to pay. rdar://problem/26228128 git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@317702 91177308-0d34-0410-b5e6-96231b3b80d8
82 lines
3.8 KiB
LLVM
82 lines
3.8 KiB
LLVM
; RUN: llc -mtriple=x86_64-linux-gnu -filetype=obj -o - %s | llvm-dwarfdump -debug-loc - | FileCheck %s
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; The test inlines the function F four times, with each inlined variable for
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; "i4" sharing the same virtual register. This means the live interval of the
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; register spans all of the inlined callsites, extending beyond the lexical
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; scope of each. Later during register allocation the live interval is split
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; into multiple intervals. Check that this does not generate multiple entries
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; within the debug location (see PR33730).
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;
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; Generated from:
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;
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; extern int foobar(int, int, int, int, int);
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;
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; int F(int i1, int i2, int i3, int i4, int i5) {
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; return foobar(i1, i2, i3, i4, i5);
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; }
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;
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; int foo(int a, int b, int c, int d, int e) {
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; return F(a,b,c,d,e) +
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; F(a,b,c,d,e) +
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; F(a,b,c,d,e) +
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; F(a,b,c,d,e);
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; }
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; CHECK: .debug_loc contents:
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; CHECK-NEXT: 0x00000000:
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; We currently emit an entry for the function prologue, too, which could be optimized away.
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; CHECK: 0x000000000000001f - 0x000000000000003c: DW_OP_reg3 RBX
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; We should only have one entry inside the function.
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; CHECK-NOT: :
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declare i32 @foobar(i32, i32, i32, i32, i32)
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define i32 @foo(i32 %a, i32 %b, i32 %c, i32 %d, i32 %e) !dbg !25 {
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entry:
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tail call void @llvm.dbg.value(metadata i32 %d, i64 0, metadata !15, metadata !17) #3, !dbg !41
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%call.i = tail call i32 @foobar(i32 %a, i32 %b, i32 %c, i32 %d, i32 %e) #3, !dbg !43
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%call.i21 = tail call i32 @foobar(i32 %a, i32 %b, i32 %c, i32 %d, i32 %e) #3, !dbg !50
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%add = add nsw i32 %call.i21, %call.i, !dbg !51
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%call.i22 = tail call i32 @foobar(i32 %a, i32 %b, i32 %c, i32 %d, i32 %e) #3, !dbg !58
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%add3 = add nsw i32 %add, %call.i22, !dbg !59
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%call.i23 = tail call i32 @foobar(i32 %a, i32 %b, i32 %c, i32 %d, i32 %e) #3, !dbg !66
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%add5 = add nsw i32 %add3, %call.i23, !dbg !67
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ret i32 %add5, !dbg !68
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}
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declare void @llvm.dbg.value(metadata, i64, metadata, metadata)
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!llvm.dbg.cu = !{!0}
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!llvm.module.flags = !{!3, !4, !5}
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!llvm.ident = !{!6}
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!0 = distinct !DICompileUnit(language: DW_LANG_C99, file: !1, producer: "clang version 6.0.0 (trunk 308976)", isOptimized: true, runtimeVersion: 0, emissionKind: FullDebug, enums: !2)
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!1 = !DIFile(filename: "foo.c", directory: "")
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!2 = !{}
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!3 = !{i32 2, !"Dwarf Version", i32 4}
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!4 = !{i32 2, !"Debug Info Version", i32 3}
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!5 = !{i32 1, !"wchar_size", i32 4}
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!6 = !{!"clang version 6.0.0 (trunk 308976)"}
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!7 = distinct !DISubprogram(name: "F", scope: !1, file: !1, line: 3, type: !8, isLocal: false, isDefinition: true, scopeLine: 3, flags: DIFlagPrototyped, isOptimized: true, unit: !0, variables: !11)
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!8 = !DISubroutineType(types: !9)
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!9 = !{!10, !10, !10, !10, !10, !10}
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!10 = !DIBasicType(name: "int", size: 32, encoding: DW_ATE_signed)
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!11 = !{!15}
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!15 = !DILocalVariable(name: "i4", arg: 4, scope: !7, file: !1, line: 3, type: !10)
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!17 = !DIExpression()
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!25 = distinct !DISubprogram(name: "foo", scope: !1, file: !1, line: 7, type: !8, isLocal: false, isDefinition: true, scopeLine: 7, flags: DIFlagPrototyped, isOptimized: true, unit: !0, variables: !26)
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!26 = !{}
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!38 = distinct !DILocation(line: 8, column: 10, scope: !25)
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!41 = !DILocation(line: 3, column: 35, scope: !7, inlinedAt: !38)
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!43 = !DILocation(line: 4, column: 10, scope: !7, inlinedAt: !38)
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!45 = distinct !DILocation(line: 9, column: 10, scope: !25)
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!50 = !DILocation(line: 4, column: 10, scope: !7, inlinedAt: !45)
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!51 = !DILocation(line: 8, column: 23, scope: !25)
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!53 = distinct !DILocation(line: 10, column: 10, scope: !25)
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!58 = !DILocation(line: 4, column: 10, scope: !7, inlinedAt: !53)
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!59 = !DILocation(line: 9, column: 23, scope: !25)
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!61 = distinct !DILocation(line: 11, column: 10, scope: !25)
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!66 = !DILocation(line: 4, column: 10, scope: !7, inlinedAt: !61)
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!67 = !DILocation(line: 10, column: 23, scope: !25)
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!68 = !DILocation(line: 8, column: 3, scope: !25)
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