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678c15be2e
SelectionDAG::transferDbgValues() can 'reattach' SDDbgValue from one to another node, but doesn't change its source order. If the destination node has the order greater than the SDDbgValue, there are two possible issues revealed later: * If debug info is attached to an instruction that is the first definition of a register, this ends up with a def-after-use and the debug info gets 'undef' later. * If MIR has another definition of a register above the debug info, the debug info may represent a source variable incorrectly because it appears (significantly) before an instruction corresponded to this debug info. So, the patch changes the order of an SDDbgValue when it is moved to a node with greater order. Reviewers: dblaikie, jmorse, aprantl Reviewed By: aprantl Subscribers: aprantl, hiraditya, llvm-commits Tags: #llvm Differential Revision: https://reviews.llvm.org/D71175
65 lines
2.7 KiB
LLVM
65 lines
2.7 KiB
LLVM
; RUN: llc -start-after=codegenprepare -stop-before finalize-isel -o - %s | FileCheck %s
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; This tests that transferDbgValues() changes order of SDDbgValue transferred
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; to another node and debug info for 'ADD32ri' appears *after* the instruction.
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;
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; This test case was generated from the following program
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; using: clang -g -O3 -S -emit-llvm test.c
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;
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; int foo(int a, int *b) {
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; int c = a + 512;
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; if (c != 0)
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; *b = a;
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; return c;
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; }
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target datalayout = "e-m:e-p270:32:32-p271:32:32-p272:64:64-i64:64-f80:128-n8:16:32:64-S128"
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target triple = "x86_64-unknown-linux-gnu"
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; CHECK-LABEL: bb.0.entry:
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; CHECK: %[[REG:[0-9]+]]:gr32 = ADD32ri %1, 512
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; CHECK-NEXT: DBG_VALUE %[[REG]]
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; Function Attrs: nofree norecurse nounwind uwtable writeonly
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define dso_local i32 @foo(i32 %a, i32* nocapture %b) local_unnamed_addr !dbg !7 {
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entry:
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%add = add nsw i32 %a, 512, !dbg !18
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call void @llvm.dbg.value(metadata i32 %add, metadata !16, metadata !DIExpression()), !dbg !17
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%cmp = icmp eq i32 %add, 0, !dbg !18
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br i1 %cmp, label %if.end, label %if.then, !dbg !18
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if.then: ; preds = %entry
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store i32 %a, i32* %b, align 4, !dbg !18
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br label %if.end, !dbg !18
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if.end: ; preds = %entry, %if.then
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ret i32 %add, !dbg !18
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}
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; Function Attrs: nounwind readnone speculatable willreturn
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declare void @llvm.dbg.value(metadata, 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 10.0.0", isOptimized: true, runtimeVersion: 0, emissionKind: FullDebug, enums: !2, nameTableKind: None)
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!1 = !DIFile(filename: "test.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 10.0.0"}
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!7 = distinct !DISubprogram(name: "foo", scope: !8, file: !8, line: 1, type: !9, scopeLine: 1, flags: DIFlagPrototyped | DIFlagAllCallsDescribed, spFlags: DISPFlagDefinition | DISPFlagOptimized, unit: !0, retainedNodes: !13)
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!8 = !DIFile(filename: "test.c", directory: "/")
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!9 = !DISubroutineType(types: !10)
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!10 = !{!11, !11, !12}
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!11 = !DIBasicType(name: "int", size: 32, encoding: DW_ATE_signed)
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!12 = !DIDerivedType(tag: DW_TAG_pointer_type, baseType: !11, size: 64)
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!13 = !{!14, !15, !16}
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!14 = !DILocalVariable(name: "a", arg: 1, scope: !7, file: !8, line: 1, type: !11)
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!15 = !DILocalVariable(name: "b", arg: 2, scope: !7, file: !8, line: 1, type: !12)
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!16 = !DILocalVariable(name: "c", scope: !7, file: !8, line: 2, type: !11)
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!17 = !DILocation(line: 0, scope: !7)
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!18 = !DILocation(line: 2, column: 13, scope: !7)
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