e10e936315
This patch makes two notable changes to the MIR debug info representation,
which result in different MIR output but identical final DWARF output (NFC
w.r.t. the full compilation). The two changes are:
* The introduction of a new MachineOperand type, MO_DbgInstrRef, which
consists of two unsigned numbers that are used to index an instruction
and an output operand within that instruction, having a meaning
identical to first two operands of the current DBG_INSTR_REF
instruction. This operand is only used in DBG_INSTR_REF (see below).
* A change in syntax for the DBG_INSTR_REF instruction, shuffling the
operands to make it resemble DBG_VALUE_LIST instead of DBG_VALUE,
and replacing the first two operands with a single MO_DbgInstrRef-type
operand.
This patch is the first of a set that will allow DBG_INSTR_REF
instructions to refer to multiple machine locations in the same manner
as DBG_VALUE_LIST.
Reviewed By: jmorse
Differential Revision: https://reviews.llvm.org/D129372
39 lines
1.7 KiB
LLVM
39 lines
1.7 KiB
LLVM
; RUN: llc %s -stop-before=finalize-isel -march=aarch64 -o - \
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; RUN: -experimental-debug-variable-locations | FileCheck %s
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; Test that when an SSA Value becomes a constant-physreg copy, under the
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; instruction referencing model, the COPY is labelled. In the general case
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; labelling a copy is undesirable -- this test really checks that we don't
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; crash, and we don't just drop the information.
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; CHECK: DBG_PHI $xzr, 1
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; CHECK: DBG_INSTR_REF {{.+}}, dbg-instr-ref(1, 0)
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define i64 @test() !dbg !7 {
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%foo = add i64 0, 0
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call void @llvm.dbg.value(metadata i64 %foo, metadata !12, metadata !DIExpression()), !dbg !13
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ret i64 %foo, !dbg !13
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}
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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, isOptimized: false, runtimeVersion: 0, emissionKind: FullDebug, enums: !2, splitDebugInlining: false, nameTableKind: None)
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!1 = !DIFile(filename: "test.c", directory: "/tmp/out.c")
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!2 = !{}
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!3 = !{i32 7, !"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 = !{!""}
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!7 = distinct !DISubprogram(name: "foo", scope: !1, file: !1, line: 3, type: !8, scopeLine: 3, flags: DIFlagPrototyped, spFlags: DISPFlagDefinition, unit: !0, retainedNodes: !2)
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!8 = !DISubroutineType(types: !9)
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!9 = !{!10, !11, !11}
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!10 = !DIBasicType(name: "int", size: 32, encoding: DW_ATE_signed)
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!11 = !DIBasicType(name: "long int", size: 64, encoding: DW_ATE_signed)
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!12 = !DILocalVariable(name: "bar", arg: 1, scope: !7, file: !1, line: 3, type: !11)
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!13 = !DILocation(line: 0, scope: !7)
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!14 = !DILocalVariable(name: "baz", arg: 2, scope: !7, file: !1, line: 3, type: !11)
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