1# RUN: llc -mtriple=x86_64-unknown-unknown %s -o - -run-pass=livedebugvalues | FileCheck %s 2# 3# Fix some of PR42772. Consider the code below: the arguments are forced onto 4# the stack by the FORCE_SPILL macro, and go out of liveness if the 5# "bees == 2" conditional is not taken. A spill slot is then re-used to 6# preserve quux over the second FORCE_SPILL, over-writing the value of either 7# "a" or "b". LiveDebugValues should detect when this happens, and terminate 8# stack-spill locations when they get overwritten by a new value. 9# 10# --------8<-------- 11# #define FORCE_SPILL() \ 12# __asm volatile("" : : : \ 13# "rax", "rbx", "rcx", "rdx", "rsi", "rdi", "rbp", "r8", \ 14# "r9", "r10", "r11", "r12", "r13", "r14", "r15") 15# 16# volatile int bees = 0; 17# 18# long int f(long int a, long int b) { 19# if (bees == 12) 20# return 3; 21# 22# FORCE_SPILL(); 23# if (bees == 2) 24# return a - b; 25# 26# int quux = sum(1, 2); 27# FORCE_SPILL(); 28# bees++; 29# return quux; 30# } 31# -------->8-------- 32# 33# CHECK: ![[ANUM:[0-9]+]] = !DILocalVariable(name: "a" 34# CHECK: ![[BNUM:[0-9]+]] = !DILocalVariable(name: "b" 35# 36# These variables should be spilt, 37# CHECK-LABEL: bb.1.if.end: 38# CHECK: MOV64mr $rsp, 1, $noreg, 16, $noreg, killed renamable $rsi 39# CHECK-NEXT: DBG_VALUE $rsp, 0, ![[BNUM]], !DIExpression( 40# CHECK-NEXT: MOV64mr $rsp, 1, $noreg, 8, $noreg, killed renamable $rdi 41# CHECK-NEXT: DBG_VALUE $rsp, 0, ![[ANUM]], !DIExpression( 42# CHECK-NEXT: INLINEASM 43# 44# Then the location of "a" should be terminated when overwritten 45# CHECK-LABEL: bb.3.if.end3: 46# CHECK: CALL64pcrel32 @sum 47# CHECK-NEXT: MOV64mr $rsp, 1, $noreg, 8, $noreg, $rax 48# CHECK-NEXT: DBG_VALUE $noreg, $noreg, ![[ANUM]], !DIExpression() 49# CHECK-NEXT: INLINEASM 50 51--- | 52 target datalayout = "e-m:e-i64:64-f80:128-n8:16:32:64-S128" 53 target triple = "x86_64-unknown-linux-gnu" 54 55 @bees = external global i32, !dbg !0 56 57 ; Function Attrs: noinline norecurse nounwind readnone uwtable 58 declare i64 @sum(i64, i64) 59 60 ; Function Attrs: noinline nounwind uwtable 61 define i64 @f(i64 %a, i64 %b) !dbg !12 { 62 entry: 63 br label %if.end 64 if.end: 65 br label %if.then2 66 if.then2: 67 br label %if.end3 68 if.end3: 69 br label %return 70 return: 71 ret i64 0 72 } 73 74 !llvm.dbg.cu = !{!2} 75 !llvm.module.flags = !{!8, !9, !10} 76 77 !0 = !DIGlobalVariableExpression(var: !1, expr: !DIExpression()) 78 !1 = distinct !DIGlobalVariable(name: "bees", scope: !2, file: !3, line: 6, type: !6, isLocal: false, isDefinition: true) 79 !2 = distinct !DICompileUnit(language: DW_LANG_C99, file: !3, producer: "clang", isOptimized: true, runtimeVersion: 0, emissionKind: FullDebug, enums: !4, globals: !5, nameTableKind: None) 80 !3 = !DIFile(filename: "pr42772.c", directory: ".") 81 !4 = !{} 82 !5 = !{!0} 83 !6 = !DIDerivedType(tag: DW_TAG_volatile_type, baseType: !7) 84 !7 = !DIBasicType(name: "int", size: 32, encoding: DW_ATE_signed) 85 !8 = !{i32 2, !"Dwarf Version", i32 4} 86 !9 = !{i32 2, !"Debug Info Version", i32 3} 87 !10 = !{i32 1, !"wchar_size", i32 4} 88 !12 = distinct !DISubprogram(name: "f", scope: !3, file: !3, line: 15, type: !13, scopeLine: 15, flags: DIFlagPrototyped, spFlags: DISPFlagDefinition | DISPFlagOptimized, unit: !2, retainedNodes: !16) 89 !13 = !DISubroutineType(types: !14) 90 !14 = !{!15, !15, !15} 91 !15 = !DIBasicType(name: "long int", size: 64, encoding: DW_ATE_signed) 92 !16 = !{!17, !18, !19} 93 !17 = !DILocalVariable(name: "a", arg: 1, scope: !12, file: !3, line: 15, type: !15) 94 !18 = !DILocalVariable(name: "b", arg: 2, scope: !12, file: !3, line: 15, type: !15) 95 !19 = !DILocalVariable(name: "quux", scope: !12, file: !3, line: 23, type: !7) 96 !28 = !DILocation(line: 1, column: 1, scope: !12) 97 98... 99--- 100name: f 101tracksRegLiveness: true 102liveins: 103 - { reg: '$rdi', virtual-reg: '' } 104 - { reg: '$rsi', virtual-reg: '' } 105frameInfo: 106 stackSize: 72 107 offsetAdjustment: -72 108 maxAlignment: 8 109 adjustsStack: true 110 hasCalls: true 111 cvBytesOfCalleeSavedRegisters: 48 112fixedStack: 113 - { id: 0, type: spill-slot, offset: -56, size: 8, alignment: 8, stack-id: default, 114 callee-saved-register: '$rbx', callee-saved-restored: true, debug-info-variable: '', 115 debug-info-expression: '', debug-info-location: '' } 116 - { id: 1, type: spill-slot, offset: -48, size: 8, alignment: 16, stack-id: default, 117 callee-saved-register: '$r12', callee-saved-restored: true, debug-info-variable: '', 118 debug-info-expression: '', debug-info-location: '' } 119 - { id: 2, type: spill-slot, offset: -40, size: 8, alignment: 8, stack-id: default, 120 callee-saved-register: '$r13', callee-saved-restored: true, debug-info-variable: '', 121 debug-info-expression: '', debug-info-location: '' } 122 - { id: 3, type: spill-slot, offset: -32, size: 8, alignment: 16, stack-id: default, 123 callee-saved-register: '$r14', callee-saved-restored: true, debug-info-variable: '', 124 debug-info-expression: '', debug-info-location: '' } 125 - { id: 4, type: spill-slot, offset: -24, size: 8, alignment: 8, stack-id: default, 126 callee-saved-register: '$r15', callee-saved-restored: true, debug-info-variable: '', 127 debug-info-expression: '', debug-info-location: '' } 128 - { id: 5, type: spill-slot, offset: -16, size: 8, alignment: 16, stack-id: default, 129 callee-saved-register: '$rbp', callee-saved-restored: true, debug-info-variable: '', 130 debug-info-expression: '', debug-info-location: '' } 131stack: 132 - { id: 0, name: '', type: spill-slot, offset: -72, size: 8, alignment: 8, 133 stack-id: default, callee-saved-register: '', callee-saved-restored: true, 134 debug-info-variable: '', debug-info-expression: '', debug-info-location: '' } 135 - { id: 1, name: '', type: spill-slot, offset: -64, size: 8, alignment: 8, 136 stack-id: default, callee-saved-register: '', callee-saved-restored: true, 137 debug-info-variable: '', debug-info-expression: '', debug-info-location: '' } 138body: | 139 bb.0.entry: 140 successors: %bb.4, %bb.1 141 liveins: $rdi, $rsi, $rbp, $r15, $r14, $r13, $r12, $rbx 142 143 DBG_VALUE $rdi, $noreg, !17, !DIExpression(), debug-location !28 144 DBG_VALUE $rdi, $noreg, !17, !DIExpression(), debug-location !28 145 DBG_VALUE $rsi, $noreg, !18, !DIExpression(), debug-location !28 146 DBG_VALUE $rsi, $noreg, !18, !DIExpression(), debug-location !28 147 frame-setup PUSH64r killed $rbp, implicit-def $rsp, implicit $rsp, debug-location !28 148 frame-setup PUSH64r killed $r15, implicit-def $rsp, implicit $rsp, debug-location !28 149 frame-setup PUSH64r killed $r14, implicit-def $rsp, implicit $rsp, debug-location !28 150 frame-setup PUSH64r killed $r13, implicit-def $rsp, implicit $rsp, debug-location !28 151 frame-setup PUSH64r killed $r12, implicit-def $rsp, implicit $rsp, debug-location !28 152 frame-setup PUSH64r killed $rbx, implicit-def $rsp, implicit $rsp, debug-location !28 153 $rsp = frame-setup SUB64ri8 $rsp, 24, implicit-def dead $eflags 154 renamable $ecx = MOV32rm $rip, 1, $noreg, @bees, $noreg, debug-location !28 :: (volatile dereferenceable load (s32) from @bees) 155 $eax = MOV32ri 3, implicit-def $rax 156 CMP32ri8 killed renamable $ecx, 12, implicit-def $eflags, debug-location !28 157 JCC_1 %bb.4, 4, implicit $eflags, debug-location !28 158 159 bb.1.if.end: 160 successors: %bb.2, %bb.3 161 liveins: $rdi, $rsi 162 163 MOV64mr $rsp, 1, $noreg, 16, $noreg, killed renamable $rsi :: (store (s64) into %stack.1) 164 MOV64mr $rsp, 1, $noreg, 8, $noreg, killed renamable $rdi :: (store (s64) into %stack.0) 165 INLINEASM &"", 1, 12, implicit-def dead early-clobber $rax, 12, implicit-def dead early-clobber $rbx, 12, implicit-def dead early-clobber $rcx, 12, implicit-def dead early-clobber $rdx, 12, implicit-def dead early-clobber $rsi, 12, implicit-def dead early-clobber $rdi, 12, implicit-def dead early-clobber $rbp, 12, implicit-def dead early-clobber $r8, 12, implicit-def dead early-clobber $r9, 12, implicit-def dead early-clobber $r10, 12, implicit-def dead early-clobber $r11, 12, implicit-def dead early-clobber $r12, 12, implicit-def dead early-clobber $r13, 12, implicit-def dead early-clobber $r14, 12, implicit-def dead early-clobber $r15, 12, implicit-def dead early-clobber $df, 12, implicit-def dead early-clobber $fpsw, 12, implicit-def dead early-clobber $eflags, debug-location !28 166 renamable $eax = MOV32rm $rip, 1, $noreg, @bees, $noreg, debug-location !28 :: (volatile dereferenceable load (s32) from @bees) 167 CMP32ri8 killed renamable $eax, 2, implicit-def $eflags, debug-location !28 168 JCC_1 %bb.3, 5, implicit killed $eflags, debug-location !28 169 170 bb.2.if.then2: 171 successors: %bb.4 172 173 renamable $rax = MOV64rm $rsp, 1, $noreg, 8, $noreg :: (load (s64) from %stack.0) 174 renamable $rax = SUB64rm killed renamable $rax, $rsp, 1, $noreg, 16, $noreg, implicit-def dead $eflags, debug-location !28 :: (load (s64) from %stack.1) 175 JMP_1 %bb.4 176 177 bb.3.if.end3: 178 successors: %bb.4 179 180 $edi = MOV32ri 1, implicit-def $rdi, debug-location !28 181 $esi = MOV32ri 2, implicit-def $rsi, debug-location !28 182 CALL64pcrel32 @sum, csr_64, implicit $rsp, implicit $ssp, implicit $rdi, implicit $rsi, implicit-def $rsp, implicit-def $ssp, implicit-def $rax, debug-location !28 183 MOV64mr $rsp, 1, $noreg, 8, $noreg, $rax :: (store (s64) into %stack.0) 184 INLINEASM &"", 1, 12, implicit-def dead early-clobber $rax, 12, implicit-def dead early-clobber $rbx, 12, implicit-def dead early-clobber $rcx, 12, implicit-def dead early-clobber $rdx, 12, implicit-def dead early-clobber $rsi, 12, implicit-def dead early-clobber $rdi, 12, implicit-def dead early-clobber $rbp, 12, implicit-def dead early-clobber $r8, 12, implicit-def dead early-clobber $r9, 12, implicit-def dead early-clobber $r10, 12, implicit-def dead early-clobber $r11, 12, implicit-def dead early-clobber $r12, 12, implicit-def dead early-clobber $r13, 12, implicit-def dead early-clobber $r14, 12, implicit-def dead early-clobber $r15, 12, implicit-def dead early-clobber $df, 12, implicit-def dead early-clobber $fpsw, 12, implicit-def dead early-clobber $eflags, debug-location !28 185 ADD32mi8 $rip, 1, $noreg, @bees, $noreg, 1, implicit-def dead $eflags, debug-location !28 :: (volatile store (s32) into @bees), (volatile dereferenceable load (s32) from @bees) 186 renamable $rax = MOVSX64rm32 $rsp, 1, $noreg, 8, $noreg, debug-location !28 :: (load (s32) from %stack.0, align 8) 187 188 bb.4.return: 189 liveins: $rax 190 191 $rsp = frame-destroy ADD64ri8 $rsp, 24, implicit-def dead $eflags, debug-location !28 192 $rbx = frame-destroy POP64r implicit-def $rsp, implicit $rsp, debug-location !28 193 $r12 = frame-destroy POP64r implicit-def $rsp, implicit $rsp, debug-location !28 194 $r13 = frame-destroy POP64r implicit-def $rsp, implicit $rsp, debug-location !28 195 $r14 = frame-destroy POP64r implicit-def $rsp, implicit $rsp, debug-location !28 196 $r15 = frame-destroy POP64r implicit-def $rsp, implicit $rsp, debug-location !28 197 $rbp = frame-destroy POP64r implicit-def $rsp, implicit $rsp, debug-location !28 198 RETQ $rax, debug-location !28 199 200... 201