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75a07ccbc2
When given the -experimental-debug-variable-locations option (via -Xclang or to llc), have SelectionDAG generate DBG_INSTR_REF instructions instead of DBG_VALUE. For now, this only happens in a limited circumstance: when the value referred to is not a PHI and is defined in the current block. Other situations introduce interesting problems, addresed in later patches. Practically, this patch hooks into InstrEmitter and if it can find a defining instruction for a value, gives it an instruction number, and points the DBG_INSTR_REF at that <instr, operand> pair. Differential Revision: https://reviews.llvm.org/D85747
55 lines
2.3 KiB
LLVM
55 lines
2.3 KiB
LLVM
; RUN: llc %s -mtriple=x86_64-unknown-unknown -o - -stop-before=finalize-isel \
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; RUN: | FileCheck %s --check-prefix=NORMAL \
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; RUN: --implicit-check-not=debug-instr-number \
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; RUN: --implicit-check-not=DBG_INSTR_REF
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; RUN: llc %s -mtriple=x86_64-unknown-unknown -o - -stop-before=finalize-isel \
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; RUN: -experimental-debug-variable-locations -verify-machineinstrs \
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; RUN: | FileCheck %s --check-prefix=INSTRREF \
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; RUN: --implicit-check-not=DBG_VALUE
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; Test that SelectionDAG produces DBG_VALUEs normally, but DBG_INSTR_REFs when
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; asked.
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; NORMAL: %[[REG0:[0-9]+]]:gr32 = ADD32rr
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; NORMAL-NEXT: DBG_VALUE %[[REG0]]
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; NORMAL-NEXT: %[[REG1:[0-9]+]]:gr32 = ADD32rr
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; NORMAL-NEXT: DBG_VALUE %[[REG1]]
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; Note that I'm baking in an assumption of one-based ordering here. We could
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; capture and check for the instruction numbers, we'd rely on machine verifier
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; ensuring there were no duplicates.
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; INSTRREF: ADD32rr
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; INSTRREF-SAME: debug-instr-number 1
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; INSTRREF-NEXT: DBG_INSTR_REF 1, 0
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; INSTRREF-NEXT: ADD32rr
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; INSTRREF-SAME: debug-instr-number 2
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; INSTRREF-NEXT: DBG_INSTR_REF 2, 0
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declare void @llvm.dbg.value(metadata, metadata, metadata)
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define i32 @foo(i32 %bar, i32 %baz, i32 %qux) !dbg !7 {
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entry:
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%0 = add i32 %bar, %baz, !dbg !14
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call void @llvm.dbg.value(metadata i32 %0, metadata !13, metadata !DIExpression()), !dbg !14
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%1 = add i32 %0, %qux
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call void @llvm.dbg.value(metadata i32 %1, metadata !13, metadata !DIExpression()), !dbg !14
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ret i32 %1, !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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