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