c383f4d655
Prior to this patch, variadic DIExpressions (i.e. ones that contain DW_OP_LLVM_arg) could only be created by salvaging debug values to create stack value expressions, resulting in a DBG_VALUE_LIST being created. As of the previous patch in this patch stack, DBG_INSTR_REF's syntax has been changed to match DBG_VALUE_LIST in preparation for supporting variadic expressions. This patch adds some minor changes needed to allow variadic expressions that aren't stack values to exist, and allows variadic expressions that are trivially reduceable to non-variadic expressions to be handled similarly to non-variadic expressions. Reviewed by: jmorse Differential Revision: https://reviews.llvm.org/D133926
78 lines
2.8 KiB
LLVM
78 lines
2.8 KiB
LLVM
; 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$%_]*}}, $noreg, ![[BAZVAR]],
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; CHECK-SAME: !DIExpression()
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; CHECK-LABEL: bb.1.if.then:
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; CHECK-LABEL: bb.2.if.else:
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; CHECK: DBG_VALUE {{[0-9a-zA-Z$%_]*}}, $noreg, ![[BAZVAR]],
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; CHECK-SAME: !DIExpression()
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; CHECK: DBG_VALUE_LIST ![[BAZVAR]],
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; CHECK-SAME: !DIExpression(DW_OP_LLVM_arg, 0, DW_OP_plus_uconst, 1, DW_OP_stack_value)
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; CHECK-SAME: {{[0-9a-zA-Z$%_]*}}
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; CHECK-LABEL: bb.3.if.end:
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; CHECK-NOT: DBG_VALUE
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; CHECK-NOT: DBG_VALUE_LIST
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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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