86 lines
3.3 KiB
YAML
86 lines
3.3 KiB
YAML
# RUN: llc %s -o - -run-pass=livedebugvalues -mtriple=x86_64-unknown-unknown | FileCheck %s
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#
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# This is a regression test for register/stack variable locations being
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# interpreted as each other. We place a variable location on the stack, based
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# on $rsp. We later make a memory load from $rsp. On faulty versions of LLVM
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# this gets interpreted as a stack restore of the spilt value (it's not).
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#
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# Test that LiveDebugValues does not create any new variable locations.
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#
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# CHECK-LABEL: name: baaar
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# CHECK-LABEL: bb.0.entry:
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# CHECK: DBG_VALUE $r9d, $noreg, !{{[0-9]*}}, !DIExpression()
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# CHECK: DBG_VALUE $rsp, 0, !{{[0-9]*}}, !DIExpression(DW_OP_plus_uconst, 16)
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# CHECK-NOT: DBG_VALUE
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--- |
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target datalayout = "e-m:e-i64:64-f80:128-n8:16:32:64-S128"
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target triple = "x86_64-unknown-linux-gnu"
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define void @baaar() !dbg !4 {
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entry:
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ret void
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}
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!llvm.module.flags = !{!0, !1}
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!llvm.dbg.cu = !{!2}
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!0 = !{i32 2, !"Debug Info Version", i32 3}
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!1 = !{i32 2, !"Dwarf Version", i32 4}
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!2 = distinct !DICompileUnit(language: DW_LANG_C_plus_plus, file: !3, producer: "", isOptimized: true, runtimeVersion: 0, emissionKind: FullDebug)
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!3 = !DIFile(filename: "sheep.cpp", directory: ".")
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!4 = distinct !DISubprogram(name: "baaar", scope: !3, file: !3, line: 1, type: !5, spFlags: DISPFlagDefinition, unit: !2, retainedNodes: !8)
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!5 = !DISubroutineType(types: !6)
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!6 = !{!7}
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!7 = !DIBasicType(name: "int", size: 32, align: 32, encoding: DW_ATE_signed)
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!8 = !{!9}
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!9 = !DILocalVariable(name: "moo", scope: !4, file: !3, line: 1, type: !7)
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!10 = !DILocation(line: 1, scope: !4)
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...
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---
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name: baaar
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alignment: 16
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tracksRegLiveness: true
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liveins:
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- { reg: '$rdi', virtual-reg: '' }
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- { reg: '$rsi', virtual-reg: '' }
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- { reg: '$rdx', virtual-reg: '' }
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- { reg: '$rcx', virtual-reg: '' }
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- { reg: '$r8', virtual-reg: '' }
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- { reg: '$r9d', virtual-reg: '' }
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frameInfo:
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stackSize: 24
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offsetAdjustment: -24
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maxAlignment: 8
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adjustsStack: true
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hasCalls: true
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fixedStack:
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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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- { id: 1, name: '', type: spill-slot, offset: -32, 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.entry:
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liveins: $rcx, $rdi, $rdx, $rsi, $r8, $r9d, $rbp, $r15, $r14, $r13, $r12, $rbx
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; Setup
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DBG_VALUE $r9d, $noreg, !9, !DIExpression(), debug-location !10
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$rsp = frame-setup SUB64ri8 $rsp, 24, implicit-def dead $eflags
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; Spill
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MOV32mr $rsp, 1, $noreg, 16, $noreg, $r9d :: (store 4 into %stack.0)
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DBG_VALUE $rsp, 0, !9, !DIExpression(DW_OP_plus_uconst, 16), debug-location !10
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; This load from the stack can be misinterpreted as a stack restore of
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; any DBG_VALUe pointing at $rsp.
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$rsi = MOV64rm $rsp, 1, $noreg, 0, $noreg :: (load 8 from %stack.1)
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; Return faff
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$eax = MOV32ri 0
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$rsp = frame-destroy ADD64ri8 $rsp, 24, implicit-def dead $eflags
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RETQ debug-location !10
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...
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