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76 lines
2.7 KiB
76 lines
2.7 KiB
4 months ago
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; RUN: llc %s -mtriple=x86_64-unknown-unknown -o - -stop-after=livedebugvalues | FileCheck %s
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;
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; In the C below, 'baz' is re-assigned with a value that gets salvaged, making
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; it's dbg.value base itself on 'bar', but with a complex expression.
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; LiveDebugValues should recognize that these are different locations, and not
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; propagate a location for 'baz' into the return block.
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;
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; void escape1(int bees);
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; void escape2(int bees);
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;
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; int foo(int bar) {
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; int baz = bar;
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; if (baz == 12) {
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; escape1(bar);
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; } else {
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; baz += 1;
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; escape2(bar);
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; }
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;
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; return bar;
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; }
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;
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; We should get a plain DBG_VALUE in the entry block, a plain one then complex
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; one in the block two, and none in block three.
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; CHECK: ![[BAZVAR:[0-9]+]] = !DILocalVariable(name: "baz",
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; CHECK-LABEL: bb.0.entry:
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; CHECK: DBG_VALUE {{[0-9a-zA-Z$%_]*}}, $noreg, ![[BAZVAR]],
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; CHECK-SAME: !DIExpression()
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; CHECK-LABEL: bb.1.if.then:
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; CHECK-LABEL: bb.2.if.else:
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; CHECK: DBG_VALUE {{[0-9a-zA-Z$%_]*}}, $noreg, ![[BAZVAR]],
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; CHECK-SAME: !DIExpression()
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; CHECK: DBG_VALUE {{[0-9a-zA-Z$%_]*}}, $noreg, ![[BAZVAR]],
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; CHECK-SAME: !DIExpression(DW_OP_plus_uconst, 1, DW_OP_stack_value)
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; CHECK-LABEL: bb.3.if.end:
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; CHECK-NOT: DBG_VALUE
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declare void @escape1(i32)
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declare void @escape2(i32)
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declare void @llvm.dbg.value(metadata, metadata, metadata)
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define i32 @foo(i32 returned %bar) !dbg !7 {
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entry:
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call void @llvm.dbg.value(metadata i32 %bar, metadata !13, metadata !DIExpression()), !dbg !14
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%cmp = icmp eq i32 %bar, 12, !dbg !14
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br i1 %cmp, label %if.then, label %if.else, !dbg !14
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if.then:
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tail call void @escape1(i32 12) #3, !dbg !14
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br label %if.end, !dbg !14
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if.else:
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call void @llvm.dbg.value(metadata i32 %bar, metadata !13, metadata !DIExpression(DW_OP_plus_uconst, 1, DW_OP_stack_value)), !dbg !14
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tail call void @escape2(i32 %bar) #3, !dbg !14
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br label %if.end
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if.end:
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ret i32 %bar, !dbg !14
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}
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!llvm.dbg.cu = !{!0}
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!llvm.module.flags = !{!3, !4}
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!0 = distinct !DICompileUnit(language: DW_LANG_C99, file: !1, producer: "clang", isOptimized: true, runtimeVersion: 0, emissionKind: FullDebug, enums: !2, nameTableKind: None)
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!1 = !DIFile(filename: "exprconflict.c", directory: "/home/jmorse")
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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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!7 = distinct !DISubprogram(name: "foo", scope: !1, file: !1, line: 5, type: !8, scopeLine: 5, flags: DIFlagPrototyped, spFlags: DISPFlagDefinition | DISPFlagOptimized, unit: !0, retainedNodes: !11)
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!8 = !DISubroutineType(types: !9)
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!9 = !{!10, !10}
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!10 = !DIBasicType(name: "int", size: 32, encoding: DW_ATE_signed)
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!11 = !{!13}
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!13 = !DILocalVariable(name: "baz", scope: !7, file: !1, line: 6, type: !10)
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!14 = !DILocation(line: 1, scope: !7)
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