110 lines
5.4 KiB
YAML
110 lines
5.4 KiB
YAML
# RUN: llc %s -march=x86-64 -run-pass=livedebugvalues -experimental-debug-variable-locations -o - 2>&1 | FileCheck %s
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#
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# Test that when we have a subregister qualifiers in substitutions, that
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# InstrRefBasedLDV correctly applies them to the variable location. Below, a
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# call defines all of $rax, but the variable locations should only apply to
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# the low order 8 bits.
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--- |
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define i8 @test(i32 %bar) local_unnamed_addr !dbg !7 {
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entry:
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ret i8 0, !dbg !12
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}
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declare dso_local void @ext(i64)
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!llvm.dbg.cu = !{!0}
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!llvm.module.flags = !{!3, !4, !5, !6}
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!0 = distinct !DICompileUnit(language: DW_LANG_C_plus_plus, file: !1, producer: "", isOptimized: true, runtimeVersion: 0, emissionKind: FullDebug)
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!1 = !DIFile(filename: "foo.cpp", directory: ".")
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!2 = !DIBasicType(name: "int", size: 8, encoding: DW_ATE_signed)
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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 2}
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!6 = !{i32 7, !"PIC Level", i32 2}
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!7 = distinct !DISubprogram(name: "foo", linkageName: "foo", scope: !1, file: !1, line: 6, type: !8, scopeLine: 6, flags: DIFlagPrototyped, spFlags: DISPFlagDefinition | DISPFlagOptimized, unit: !0, retainedNodes: !10)
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!8 = !DISubroutineType(types: !9)
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!9 = !{!2, !2}
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!10 = !{!11}
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!11 = !DILocalVariable(name: "baz", scope: !7, file: !1, line: 7, type: !2)
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!12 = !DILocation(line: 10, scope: !7)
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...
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---
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name: test
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tracksRegLiveness: true
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liveins:
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- { reg: '$rdi', virtual-reg: '' }
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debugValueSubstitutions:
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- { srcinst: 1, srcop: 0, dstinst: 2, dstop: 0, subreg: 1 } # sub_8bit
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- { srcinst: 2, srcop: 0, dstinst: 3, dstop: 0, subreg: 4 } # sub_16bit
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- { srcinst: 3, srcop: 0, dstinst: 4, dstop: 5, subreg: 6 } # sub_32bit
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# Substitution involving sub_8bit_hi, should land in $ah
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- { srcinst: 5, srcop: 0, dstinst: 6, dstop: 0, subreg: 2 } # sub_8bit_hi
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- { srcinst: 6, srcop: 0, dstinst: 7, dstop: 0, subreg: 4 } # sub_16bit
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- { srcinst: 7, srcop: 0, dstinst: 4, dstop: 5, subreg: 6 } # sub_32bit
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# Several redundant substitutions, representing extractions from a small
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# register, followed by larger spurious ones, for example:
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# %0:gr64 = COPY $rax
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# %1:gr32 = COPY %0.sub_32bit
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# %2:gr16 = COPY %1.sub_16bit
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# %3:gr64 = SUBREG_TO_REG %2, sub_8bit_hi
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# %4:gr32 = COPY %3.sub_32bit
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# %5:gr16 = COPY %2.sub_16bit
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# Should still come out as ah.
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- { srcinst: 8, srcop: 0, dstinst: 9, dstop: 0, subreg: 4 } # sub_16bit
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- { srcinst: 9, srcop: 0, dstinst: 10,dstop: 0, subreg: 6 } # sub_32bit
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- { srcinst: 10,srcop: 0, dstinst: 11,dstop: 0, subreg: 2 } # sub_8bit_hi
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- { srcinst: 11,srcop: 0, dstinst: 12,dstop: 0, subreg: 4 } # sub_16bit
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- { srcinst: 12,srcop: 0, dstinst: 4, dstop: 5, subreg: 6 } # sub_32bit
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# If some kind of really mal-formed code appears that extracts the high bits
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# out of a too-small location, we should drop it. It's not clear whether this
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# scenario could ever happen; but if it did, best to not emit a known bad
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# variable location. Should generate a DBG_VALUE $noreg.
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- { srcinst: 13, srcop: 0, dstinst: 14,dstop: 0, subreg: 5 } # sub_16bit_hi
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- { srcinst: 14, srcop: 0, dstinst: 15,dstop: 0, subreg: 6 } # sub_32bit
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- { srcinst: 15, srcop: 0, dstinst: 4, dstop: 5, subreg: 1 } # sub_8bit
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stack:
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- { id: 0, name: '', type: spill-slot, offset: -16, size: 8, alignment: 8,
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stack-id: default, callee-saved-register: '', callee-saved-restored: true,
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debug-info-variable: '', debug-info-expression: '', debug-info-location: '' }
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body: |
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bb.0:
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liveins: $rdi, $rax
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CALL64pcrel32 @ext, csr_64, implicit $rsp, implicit $ssp, implicit $edi, implicit-def $rax, debug-instr-number 4, debug-location !12
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; CHECK: CALL64pcrel32
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DBG_INSTR_REF 1, 0, !11, !DIExpression(), debug-location !12
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; CHECK-NEXT: DBG_INSTR_REF 1, 0
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; CHECK-NEXT: DBG_VALUE $al
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DBG_INSTR_REF 5, 0, !11, !DIExpression(), debug-location !12
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; CHECK-NEXT: DBG_INSTR_REF 5, 0
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; CHECK-NEXT: DBG_VALUE $ah
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DBG_INSTR_REF 8, 0, !11, !DIExpression(), debug-location !12
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; CHECK-NEXT: DBG_INSTR_REF 8, 0
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; CHECK-NEXT: DBG_VALUE $ah
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DBG_INSTR_REF 13, 0, !11, !DIExpression(), debug-location !12
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; CHECK-NEXT: DBG_INSTR_REF 13, 0
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; CHECK-NEXT: DBG_VALUE $noreg
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MOV64mr $rsp, 1, $noreg, 16, $noreg, $rax :: (store 8 into %stack.0)
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$rax = MOV64ri 0, debug-location !12
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; CHECK: $rax = MOV64ri 0
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; The value is now located in a spill slot, as a subregister within the
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; slot, which InstrRefBasedLDV should be able to find.
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DBG_INSTR_REF 1, 0, !11, !DIExpression(), debug-location !12
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; CHECK-NEXT: DBG_INSTR_REF 1, 0
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; CHECK-NEXT: DBG_VALUE $rsp, 0, !{{[0-9]*}}, !DIExpression(DW_OP_constu, 8, DW_OP_minus)
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DBG_INSTR_REF 5, 0, !11, !DIExpression(), debug-location !12
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; This and the next DBG_INSTR_REF refer to a value that is on the stack, but
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; is located at a non-zero offset from the start of the slot -- $ah within
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; $rax is 8 bits in. Today, InstrRefBasedLDV can't express this. It also
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; doesn't seem likely to be profitable.
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; CHECK-NEXT: DBG_INSTR_REF 5, 0
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; CHECK-NEXT: DBG_VALUE $noreg
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DBG_INSTR_REF 8, 0, !11, !DIExpression(), debug-location !12
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; CHECK-NEXT: DBG_INSTR_REF 8, 0
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; CHECK-NEXT: DBG_VALUE $noreg
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DBG_INSTR_REF 13, 0, !11, !DIExpression(), debug-location !12
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; CHECK-NEXT: DBG_INSTR_REF 13, 0
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; CHECK-NEXT: DBG_VALUE $noreg
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$rax = MOV64rm $rsp, 1, $noreg, 8, $noreg :: (load 8 from %stack.0)
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RET64 $rax, debug-location !12
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...
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