e7547b25f5
Interpret Key Instructions metadata to determine is_stmt placement.
The lowest rank (highest precedent) instructions in each {InlinedAt, atomGroup}
set are candidates for is_stmt. Only the last instruction in each set in a given
block gets is_stmt. Calls always get is_stmt.
RFC: https://discourse.llvm.org/t/rfc-improving-is-stmt-placement-for-better-interactive-debugging/82668
63 lines
2.9 KiB
LLVM
63 lines
2.9 KiB
LLVM
; RUN: llc %s --filetype=obj -o - --dwarf-use-key-instructions \
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; RUN: | llvm-objdump -d - --no-show-raw-insn \
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; RUN: | FileCheck %s --check-prefix=OBJ
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; RUN: llc %s --filetype=obj -o - --dwarf-use-key-instructions \
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; RUN: | llvm-dwarfdump - --debug-line \
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; RUN: | FileCheck %s --check-prefix=DBG
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;; 1. int f(int a) {
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;; 2. int x = a + 1;
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;; 3. return x;
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;; 4. }
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;; 5. int g(int b) {
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;; 6. return f(b);
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;; 7. }
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;;
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;; Both functions contain 2 instructions in unique atom groups. In f we see
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;; groups 1 and 3, and in g we see {!18, 1} and 1. All of these instructions
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;; should get is_stmt.
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; OBJ: 0000000000000000 <_Z1fi>:
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; OBJ-NEXT: 0: leal 0x1(%rdi), %eax
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; OBJ-NEXT: 3: retq
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; OBJ: 0000000000000010 <_Z1gi>:
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; OBJ-NEXT: 10: leal 0x1(%rdi), %eax
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; OBJ-NEXT: 13: retq
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; DBG: Address Line Column File ISA Discriminator OpIndex Flags
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; DBG-NEXT: ------------------ ------ ------ ------ --- ------------- ------- -------------
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; DBG-NEXT: 0x0000000000000000 2 0 0 0 0 0 is_stmt prologue_end
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; DBG-NEXT: 0x0000000000000003 3 0 0 0 0 0 is_stmt
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; DBG-NEXT: 0x0000000000000010 2 0 0 0 0 0 is_stmt prologue_end
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; DBG-NEXT: 0x0000000000000013 6 0 0 0 0 0 is_stmt
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target triple = "x86_64-unknown-linux-gnu"
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define hidden noundef i32 @_Z1fi(i32 noundef %a) local_unnamed_addr !dbg !11 {
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entry:
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%add = add nsw i32 %a, 1, !dbg !DILocation(line: 2, scope: !11, atomGroup: 1, atomRank: 2)
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ret i32 %add, !dbg !DILocation(line: 3, scope: !11, atomGroup: 3, atomRank: 1)
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}
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define hidden noundef i32 @_Z1gi(i32 noundef %b) local_unnamed_addr !dbg !16 {
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entry:
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%add.i = add nsw i32 %b, 1, !dbg !DILocation(line: 2, scope: !11, inlinedAt: !18, atomGroup: 1, atomRank: 2)
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ret i32 %add.i, !dbg !DILocation(line: 6, scope: !16, atomGroup: 1, atomRank: 1)
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}
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!llvm.dbg.cu = !{!0}
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!llvm.module.flags = !{!2, !3}
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!llvm.ident = !{!10}
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!0 = distinct !DICompileUnit(language: DW_LANG_C_plus_plus_17, file: !1, producer: "clang version 19.0.0", isOptimized: true, runtimeVersion: 0, emissionKind: LineTablesOnly, splitDebugInlining: false, nameTableKind: None)
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!1 = !DIFile(filename: "test.cpp", directory: "/")
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!2 = !{i32 7, !"Dwarf Version", i32 5}
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!3 = !{i32 2, !"Debug Info Version", i32 3}
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!10 = !{!"clang version 19.0.0"}
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!11 = distinct !DISubprogram(name: "f", scope: !1, file: !1, line: 1, type: !12, scopeLine: 1, flags: DIFlagPrototyped | DIFlagAllCallsDescribed, spFlags: DISPFlagDefinition | DISPFlagOptimized, unit: !0)
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!12 = !DISubroutineType(types: !13)
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!13 = !{}
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!16 = distinct !DISubprogram(name: "g", scope: !1, file: !1, line: 5, type: !12, scopeLine: 5, flags: DIFlagPrototyped | DIFlagAllCallsDescribed, spFlags: DISPFlagDefinition | DISPFlagOptimized, unit: !0)
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!18 = distinct !DILocation(line: 6, scope: !16)
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