| # RUN: llc -mtriple=x86_64-unknown-unknown %s -o - -run-pass=livedebugvalues | FileCheck %s |
| # |
| # Fix some of PR42772. Consider the code below: the arguments are forced onto |
| # the stack by the FORCE_SPILL macro, and go out of liveness if the |
| # "bees == 2" conditional is not taken. A spill slot is then re-used to |
| # preserve quux over the second FORCE_SPILL, over-writing the value of either |
| # "a" or "b". LiveDebugValues should detect when this happens, and terminate |
| # stack-spill locations when they get overwritten by a new value. |
| # |
| # --------8<-------- |
| # #define FORCE_SPILL() \ |
| # __asm volatile("" : : : \ |
| # "rax", "rbx", "rcx", "rdx", "rsi", "rdi", "rbp", "r8", \ |
| # "r9", "r10", "r11", "r12", "r13", "r14", "r15") |
| # |
| # volatile int bees = 0; |
| # |
| # long int f(long int a, long int b) { |
| # if (bees == 12) |
| # return 3; |
| # |
| # FORCE_SPILL(); |
| # if (bees == 2) |
| # return a - b; |
| # |
| # int quux = sum(1, 2); |
| # FORCE_SPILL(); |
| # bees++; |
| # return quux; |
| # } |
| # -------->8-------- |
| # |
| # CHECK: ![[ANUM:[0-9]+]] = !DILocalVariable(name: "a" |
| # CHECK: ![[BNUM:[0-9]+]] = !DILocalVariable(name: "b" |
| # |
| # These variables should be spilt, |
| # CHECK-LABEL: bb.1.if.end: |
| # CHECK: MOV64mr $rsp, 1, $noreg, 16, $noreg, killed renamable $rsi |
| # CHECK-NEXT: DBG_VALUE $rsp, 0, ![[BNUM]], !DIExpression( |
| # CHECK-NEXT: MOV64mr $rsp, 1, $noreg, 8, $noreg, killed renamable $rdi |
| # CHECK-NEXT: DBG_VALUE $rsp, 0, ![[ANUM]], !DIExpression( |
| # CHECK-NEXT: INLINEASM |
| # |
| # Then the location of "a" should be terminated when overwritten |
| # CHECK-LABEL: bb.3.if.end3: |
| # CHECK: CALL64pcrel32 @sum |
| # CHECK-NEXT: MOV64mr $rsp, 1, $noreg, 8, $noreg, $rax |
| # CHECK-NEXT: DBG_VALUE $noreg, $noreg, ![[ANUM]], !DIExpression() |
| # CHECK-NEXT: INLINEASM |
| |
| --- | |
| target datalayout = "e-m:e-i64:64-f80:128-n8:16:32:64-S128" |
| target triple = "x86_64-unknown-linux-gnu" |
| |
| @bees = external global i32, !dbg !0 |
| |
| ; Function Attrs: noinline norecurse nounwind readnone uwtable |
| declare i64 @sum(i64, i64) |
| |
| ; Function Attrs: noinline nounwind uwtable |
| define i64 @f(i64 %a, i64 %b) !dbg !12 { |
| entry: |
| br label %if.end |
| if.end: |
| br label %if.then2 |
| if.then2: |
| br label %if.end3 |
| if.end3: |
| br label %return |
| return: |
| ret i64 0 |
| } |
| |
| !llvm.dbg.cu = !{!2} |
| !llvm.module.flags = !{!8, !9, !10} |
| |
| !0 = !DIGlobalVariableExpression(var: !1, expr: !DIExpression()) |
| !1 = distinct !DIGlobalVariable(name: "bees", scope: !2, file: !3, line: 6, type: !6, isLocal: false, isDefinition: true) |
| !2 = distinct !DICompileUnit(language: DW_LANG_C99, file: !3, producer: "clang", isOptimized: true, runtimeVersion: 0, emissionKind: FullDebug, enums: !4, globals: !5, nameTableKind: None) |
| !3 = !DIFile(filename: "pr42772.c", directory: ".") |
| !4 = !{} |
| !5 = !{!0} |
| !6 = !DIDerivedType(tag: DW_TAG_volatile_type, baseType: !7) |
| !7 = !DIBasicType(name: "int", size: 32, encoding: DW_ATE_signed) |
| !8 = !{i32 2, !"Dwarf Version", i32 4} |
| !9 = !{i32 2, !"Debug Info Version", i32 3} |
| !10 = !{i32 1, !"wchar_size", i32 4} |
| !12 = distinct !DISubprogram(name: "f", scope: !3, file: !3, line: 15, type: !13, scopeLine: 15, flags: DIFlagPrototyped, spFlags: DISPFlagDefinition | DISPFlagOptimized, unit: !2, retainedNodes: !16) |
| !13 = !DISubroutineType(types: !14) |
| !14 = !{!15, !15, !15} |
| !15 = !DIBasicType(name: "long int", size: 64, encoding: DW_ATE_signed) |
| !16 = !{!17, !18, !19} |
| !17 = !DILocalVariable(name: "a", arg: 1, scope: !12, file: !3, line: 15, type: !15) |
| !18 = !DILocalVariable(name: "b", arg: 2, scope: !12, file: !3, line: 15, type: !15) |
| !19 = !DILocalVariable(name: "quux", scope: !12, file: !3, line: 23, type: !7) |
| !28 = !DILocation(line: 1, column: 1, scope: !12) |
| |
| ... |
| --- |
| name: f |
| tracksRegLiveness: true |
| liveins: |
| - { reg: '$rdi', virtual-reg: '' } |
| - { reg: '$rsi', virtual-reg: '' } |
| frameInfo: |
| stackSize: 72 |
| offsetAdjustment: -72 |
| maxAlignment: 8 |
| adjustsStack: true |
| hasCalls: true |
| cvBytesOfCalleeSavedRegisters: 48 |
| fixedStack: |
| - { id: 0, type: spill-slot, offset: -56, size: 8, alignment: 8, stack-id: default, |
| callee-saved-register: '$rbx', callee-saved-restored: true, debug-info-variable: '', |
| debug-info-expression: '', debug-info-location: '' } |
| - { id: 1, type: spill-slot, offset: -48, size: 8, alignment: 16, stack-id: default, |
| callee-saved-register: '$r12', callee-saved-restored: true, debug-info-variable: '', |
| debug-info-expression: '', debug-info-location: '' } |
| - { id: 2, type: spill-slot, offset: -40, size: 8, alignment: 8, stack-id: default, |
| callee-saved-register: '$r13', callee-saved-restored: true, debug-info-variable: '', |
| debug-info-expression: '', debug-info-location: '' } |
| - { id: 3, type: spill-slot, offset: -32, size: 8, alignment: 16, stack-id: default, |
| callee-saved-register: '$r14', callee-saved-restored: true, debug-info-variable: '', |
| debug-info-expression: '', debug-info-location: '' } |
| - { id: 4, type: spill-slot, offset: -24, size: 8, alignment: 8, stack-id: default, |
| callee-saved-register: '$r15', callee-saved-restored: true, debug-info-variable: '', |
| debug-info-expression: '', debug-info-location: '' } |
| - { id: 5, type: spill-slot, offset: -16, size: 8, alignment: 16, stack-id: default, |
| callee-saved-register: '$rbp', callee-saved-restored: true, debug-info-variable: '', |
| debug-info-expression: '', debug-info-location: '' } |
| stack: |
| - { id: 0, name: '', type: spill-slot, offset: -72, 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: -64, 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: |
| successors: %bb.4, %bb.1 |
| liveins: $rdi, $rsi, $rbp, $r15, $r14, $r13, $r12, $rbx |
| |
| DBG_VALUE $rdi, $noreg, !17, !DIExpression(), debug-location !28 |
| DBG_VALUE $rdi, $noreg, !17, !DIExpression(), debug-location !28 |
| DBG_VALUE $rsi, $noreg, !18, !DIExpression(), debug-location !28 |
| DBG_VALUE $rsi, $noreg, !18, !DIExpression(), debug-location !28 |
| frame-setup PUSH64r killed $rbp, implicit-def $rsp, implicit $rsp, debug-location !28 |
| frame-setup PUSH64r killed $r15, implicit-def $rsp, implicit $rsp, debug-location !28 |
| frame-setup PUSH64r killed $r14, implicit-def $rsp, implicit $rsp, debug-location !28 |
| frame-setup PUSH64r killed $r13, implicit-def $rsp, implicit $rsp, debug-location !28 |
| frame-setup PUSH64r killed $r12, implicit-def $rsp, implicit $rsp, debug-location !28 |
| frame-setup PUSH64r killed $rbx, implicit-def $rsp, implicit $rsp, debug-location !28 |
| $rsp = frame-setup SUB64ri8 $rsp, 24, implicit-def dead $eflags |
| renamable $ecx = MOV32rm $rip, 1, $noreg, @bees, $noreg, debug-location !28 :: (volatile dereferenceable load (s32) from @bees) |
| $eax = MOV32ri 3, implicit-def $rax |
| CMP32ri8 killed renamable $ecx, 12, implicit-def $eflags, debug-location !28 |
| JCC_1 %bb.4, 4, implicit $eflags, debug-location !28 |
| |
| bb.1.if.end: |
| successors: %bb.2, %bb.3 |
| liveins: $rdi, $rsi |
| |
| MOV64mr $rsp, 1, $noreg, 16, $noreg, killed renamable $rsi :: (store (s64) into %stack.1) |
| MOV64mr $rsp, 1, $noreg, 8, $noreg, killed renamable $rdi :: (store (s64) into %stack.0) |
| 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 |
| renamable $eax = MOV32rm $rip, 1, $noreg, @bees, $noreg, debug-location !28 :: (volatile dereferenceable load (s32) from @bees) |
| CMP32ri8 killed renamable $eax, 2, implicit-def $eflags, debug-location !28 |
| JCC_1 %bb.3, 5, implicit killed $eflags, debug-location !28 |
| |
| bb.2.if.then2: |
| successors: %bb.4 |
| |
| renamable $rax = MOV64rm $rsp, 1, $noreg, 8, $noreg :: (load (s64) from %stack.0) |
| renamable $rax = SUB64rm killed renamable $rax, $rsp, 1, $noreg, 16, $noreg, implicit-def dead $eflags, debug-location !28 :: (load (s64) from %stack.1) |
| JMP_1 %bb.4 |
| |
| bb.3.if.end3: |
| successors: %bb.4 |
| |
| $edi = MOV32ri 1, implicit-def $rdi, debug-location !28 |
| $esi = MOV32ri 2, implicit-def $rsi, debug-location !28 |
| CALL64pcrel32 @sum, csr_64, implicit $rsp, implicit $ssp, implicit $rdi, implicit $rsi, implicit-def $rsp, implicit-def $ssp, implicit-def $rax, debug-location !28 |
| MOV64mr $rsp, 1, $noreg, 8, $noreg, $rax :: (store (s64) into %stack.0) |
| 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 |
| 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) |
| renamable $rax = MOVSX64rm32 $rsp, 1, $noreg, 8, $noreg, debug-location !28 :: (load (s32) from %stack.0, align 8) |
| |
| bb.4.return: |
| liveins: $rax |
| |
| $rsp = frame-destroy ADD64ri8 $rsp, 24, implicit-def dead $eflags, debug-location !28 |
| $rbx = frame-destroy POP64r implicit-def $rsp, implicit $rsp, debug-location !28 |
| $r12 = frame-destroy POP64r implicit-def $rsp, implicit $rsp, debug-location !28 |
| $r13 = frame-destroy POP64r implicit-def $rsp, implicit $rsp, debug-location !28 |
| $r14 = frame-destroy POP64r implicit-def $rsp, implicit $rsp, debug-location !28 |
| $r15 = frame-destroy POP64r implicit-def $rsp, implicit $rsp, debug-location !28 |
| $rbp = frame-destroy POP64r implicit-def $rsp, implicit $rsp, debug-location !28 |
| RETQ $rax, debug-location !28 |
| |
| ... |
