1# RUN: llc %s -o - -mtriple=x86_64-unknown-unknown \ 2# RUN: -experimental-debug-variable-locations -run-pass=livedebugvalues\ 3# RUN: | FileCheck %s 4# 5# Test that a DBG_INSTR_REF that refers to a DBG_PHI, will be translated into a 6# DBG_VALUE of the value read at that DBG_PHI -- in this test, when the value 7# is on the stack. 8# 9--- | 10 target datalayout = "e-m:e-p270:32:32-p271:32:32-p272:64:64-i64:64-f80:128-n8:16:32:64-S128" 11 target triple = "x86_64-unknown-linux-gnu" 12 13 define dso_local i32 @foo(i64 %bar, i64 %baz) !dbg !7 { 14 ret i32 0 15 } 16 17 declare dso_local void @ext(i64) 18 19 declare dso_local i64 @getlong() 20 21 !llvm.dbg.cu = !{!0} 22 !llvm.module.flags = !{!3, !4, !5} 23 !llvm.ident = !{!6} 24 25 !0 = distinct !DICompileUnit(language: DW_LANG_C99, file: !1, isOptimized: false, runtimeVersion: 0, emissionKind: FullDebug, enums: !2, splitDebugInlining: false, nameTableKind: None) 26 !1 = !DIFile(filename: "test.c", directory: "/tmp/out.c") 27 !2 = !{} 28 !3 = !{i32 7, !"Dwarf Version", i32 4} 29 !4 = !{i32 2, !"Debug Info Version", i32 3} 30 !5 = !{i32 1, !"wchar_size", i32 4} 31 !6 = !{!""} 32 !7 = distinct !DISubprogram(name: "foo", scope: !1, file: !1, line: 3, type: !8, scopeLine: 3, flags: DIFlagPrototyped, spFlags: DISPFlagDefinition, unit: !0, retainedNodes: !2) 33 !8 = !DISubroutineType(types: !9) 34 !9 = !{!10, !11, !11} 35 !10 = !DIBasicType(name: "int", size: 32, encoding: DW_ATE_signed) 36 !11 = !DIBasicType(name: "long int", size: 64, encoding: DW_ATE_signed) 37 !12 = !DILocalVariable(name: "bar", arg: 1, scope: !7, file: !1, line: 3, type: !11) 38 !13 = !DILocation(line: 0, scope: !7) 39 !14 = !DILocalVariable(name: "baz", arg: 2, scope: !7, file: !1, line: 3, type: !11) 40 !19 = distinct !DILexicalBlock(scope: !7, file: !1, line: 8, column: 7) 41 !26 = !DILocation(line: 13, column: 3, scope: !7) 42 43... 44--- 45name: foo 46alignment: 16 47tracksRegLiveness: true 48debugInstrRef: true 49liveins: 50 - { reg: '$rdi' } 51 - { reg: '$rsi' } 52frameInfo: 53 stackSize: 24 54 offsetAdjustment: -24 55 maxAlignment: 1 56 adjustsStack: true 57 hasCalls: true 58 maxCallFrameSize: 0 59 cvBytesOfCalleeSavedRegisters: 16 60fixedStack: 61 - { id: 0, type: spill-slot, offset: -24, size: 8, alignment: 8, callee-saved-register: '$rbx' } 62 - { id: 1, type: spill-slot, offset: -16, size: 8, alignment: 16, callee-saved-register: '$r14' } 63machineFunctionInfo: {} 64stack: 65 - { id: 0, name: '', type: spill-slot, offset: 0, size: 8, alignment: 8, 66 stack-id: default, callee-saved-register: '', callee-saved-restored: true, 67 debug-info-variable: '', debug-info-expression: '', debug-info-location: '' } 68 69body: | 70 bb.0: 71 liveins: $rdi, $rsi, $r14, $rbx 72 ; CHECK-LABEL: bb.0: 73 74 $r14 = MOV64rr $rsi 75 $rbx = MOV64rr $rdi 76 $rax = MOV64ri 0 77 MOV64mr $rsp, 1, $noreg, 16, $noreg, $rax :: (store 8 into %stack.0) 78 $rax = MOV64ri 0 79 80 ;; A DBG_PHI of the stack should resolve to the stack location. 81 DBG_PHI %stack.0, 1, 64 82 83 ;; Reload value, clobber stack location. 84 $rcx = MOV64rm $rsp, 1, $noreg, 8, $noreg :: (load 8 from %stack.0) 85 MOV64mr $rsp, 1, $noreg, 16, $noreg, $rax :: (store 8 into %stack.0) 86 87 ;; This should resolve to the loaded register. 88 DBG_INSTR_REF !12, !DIExpression(DW_OP_LLVM_arg, 0), dbg-instr-ref(1, 0), debug-location !13 89 ; CHECK: DBG_INSTR_REF {{.+}}, dbg-instr-ref(1, 0) 90 ; CHECK-NEXT: DBG_VALUE_LIST {{.+}} $rcx 91 92 ;; And if we say it's a smaller size, we should be able to pick out smaller 93 ;; subregisters within the stack slot. 94 DBG_PHI %stack.0, 2, 32 95 $rax = MOV64ri 0 96 $rcx = MOV64rm $rsp, 1, $noreg, 8, $noreg :: (load 8 from %stack.0) 97 MOV64mr $rsp, 1, $noreg, 16, $noreg, $rax :: (store 8 into %stack.0) 98 99 ;; This should pick out the 32 bit value. 100 DBG_INSTR_REF !12, !DIExpression(DW_OP_LLVM_arg, 0), dbg-instr-ref(2, 0), debug-location !13 101 ; CHECK: DBG_INSTR_REF {{.+}}, dbg-instr-ref(2, 0) 102 ; CHECK-NEXT: DBG_VALUE_LIST {{.+}} $ecx 103 104 ;; Try all the other subregs. 105 DBG_PHI %stack.0, 3, 16 106 $rax = MOV64ri 0 107 $rcx = MOV64rm $rsp, 1, $noreg, 8, $noreg :: (load 8 from %stack.0) 108 MOV64mr $rsp, 1, $noreg, 16, $noreg, $rax :: (store 8 into %stack.0) 109 110 DBG_INSTR_REF !12, !DIExpression(DW_OP_LLVM_arg, 0), dbg-instr-ref(3, 0), debug-location !13 111 ; CHECK: DBG_INSTR_REF {{.+}}, dbg-instr-ref(3, 0) 112 ; CHECK-NEXT: DBG_VALUE_LIST {{.+}} $cx 113 114 DBG_PHI %stack.0, 4, 8 115 $rax = MOV64ri 0 116 $rcx = MOV64rm $rsp, 1, $noreg, 8, $noreg :: (load 8 from %stack.0) 117 MOV64mr $rsp, 1, $noreg, 16, $noreg, $rax :: (store 8 into %stack.0) 118 119 DBG_INSTR_REF !12, !DIExpression(DW_OP_LLVM_arg, 0), dbg-instr-ref(4, 0), debug-location !13 120 ; CHECK: DBG_INSTR_REF {{.+}}, dbg-instr-ref(4, 0) 121 ; CHECK-NEXT: DBG_VALUE_LIST {{.+}} $cl 122 123 ;; We can't, at this time, describe subregister fields with nonzero offset. 124 ;; It's easily achieved by attaching more data to stack DBG_PHIs, but it's 125 ;; not clear that LLVM will ever merge registers to generate such locations. 126 127 RET64 implicit $eax, debug-location !26 128 129... 130