/
live-debug-values-restore.mir
300 lines (269 loc) · 14.9 KB
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live-debug-values-restore.mir
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# RUN: llc -run-pass livedebugvalues -march=x86-64 -o - %s | FileCheck %s
# Generated from the following source with:
# clang -g -mllvm -stop-before=livedebugvalues -S -O2 test.c -o test.mir
# #define FORCE_SPILL() \
# __asm volatile("" : : : \
# "rax", "rbx", "rcx", "rdx", "rsi", "rdi", "rbp", "r8", \
# "r9", "r10", "r11", "r12", "r13", "r14", "r15")
# int f(int *p) {
# if (p) {
# FORCE_SPILL();
# }
# return *(p + 1);
# }
# Pick out DILocalVariable numbers for "p" and "q"
# CHECK: ![[PVAR:[0-9]+]] = !DILocalVariable(name: "p",
# CHECK: ![[QVAR:[0-9]+]] = !DILocalVariable(name: "q",
# Ascertain that the spill has been recognized and manifested in a DBG_VALUE.
# CHECK: MOV64mr $rsp,{{.*-8.*}}killed{{.*}}$rdi :: (store 8 into %stack.0)
# CHECK-NEXT: DBG_VALUE $rsp,{{.*}}![[PVAR]],{{.*}}!DIExpression(DW_OP_constu, 8, DW_OP_minus)
# Check for the restore.
# CHECK: $rdi = MOV64rm $rsp,{{.*-8.*}}:: (load 8 from %stack.0)
# CHECK-NEXT: DBG_VALUE $rdi,{{.*}}![[PVAR]], !DIExpression()
--- |
define dso_local i32 @f(i32* readonly %p) local_unnamed_addr !dbg !7 {
entry:
call void @llvm.dbg.value(metadata i32* %p, metadata !13, metadata !DIExpression()), !dbg !14
%tobool = icmp eq i32* %p, null, !dbg !15
br i1 %tobool, label %if.end, label %if.then, !dbg !17
if.then: ; preds = %entry
tail call void asm sideeffect "", "~{rax},~{rbx},~{rcx},~{rdx},~{rsi},~{rdi},~{rbp},~{r8},~{r9},~{r10},~{r11},~{r12},~{r13},~{r14},~{r15},~{dirflag},~{fpsr},~{flags}"(), !dbg !18, !srcloc !20
br label %if.end, !dbg !21
if.end: ; preds = %entry, %if.then
%add.ptr = getelementptr inbounds i32, i32* %p, i64 1, !dbg !22
%0 = load i32, i32* %add.ptr, align 4, !dbg !23, !tbaa !24
ret i32 %0, !dbg !28
}
define dso_local i32 @g(i32* readonly %p) local_unnamed_addr !dbg !107 {
entry:
call void @llvm.dbg.value(metadata i32* %p, metadata !113, metadata !DIExpression()), !dbg !114
%tobool = icmp eq i32* %p, null, !dbg !115
br i1 %tobool, label %if.end, label %if.then, !dbg !117
if.then: ; preds = %entry
tail call void asm sideeffect "", "~{rax},~{rbx},~{rcx},~{rdx},~{rsi},~{rdi},~{rbp},~{r8},~{r9},~{r10},~{r11},~{r12},~{r13},~{r14},~{r15},~{dirflag},~{fpsr},~{flags}"(), !dbg !118, !srcloc !120
br label %if.end, !dbg !121
if.end: ; preds = %entry, %if.then
%add.ptr = getelementptr inbounds i32, i32* %p, i64 1, !dbg !122
%0 = load i32, i32* %add.ptr, align 4, !dbg !123, !tbaa !24
ret i32 %0, !dbg !128
}
declare void @llvm.dbg.value(metadata, metadata, metadata)
!llvm.dbg.cu = !{!0}
!llvm.module.flags = !{!3, !4, !5}
!llvm.ident = !{!6}
!0 = distinct !DICompileUnit(language: DW_LANG_C99, file: !1, producer: "clang version 9.0.0 (https://git.llvm.org/git/clang.git/ 57a6ce7ac318de98e3e777e09cb9ed8282b5cc03) (https://git.llvm.org/git/llvm.git/ ff54a19e4912d7f15cb02798a7f2048441bff751)", isOptimized: true, runtimeVersion: 0, emissionKind: FullDebug, enums: !2, nameTableKind: None)
!1 = !DIFile(filename: "test2.c", directory: "/home/test")
!2 = !{}
!3 = !{i32 2, !"Dwarf Version", i32 4}
!4 = !{i32 2, !"Debug Info Version", i32 3}
!5 = !{i32 1, !"wchar_size", i32 4}
!6 = !{!"clang version 9.0.0 (https://git.llvm.org/git/clang.git/ 57a6ce7ac318de98e3e777e09cb9ed8282b5cc03) (https://git.llvm.org/git/llvm.git/ ff54a19e4912d7f15cb02798a7f2048441bff751)"}
!7 = distinct !DISubprogram(name: "f", scope: !1, file: !1, line: 5, type: !8, scopeLine: 5, flags: DIFlagPrototyped, spFlags: DISPFlagDefinition | DISPFlagOptimized, unit: !0, retainedNodes: !12)
!8 = !DISubroutineType(types: !9)
!9 = !{!10, !11}
!10 = !DIBasicType(name: "int", size: 32, encoding: DW_ATE_signed)
!11 = !DIDerivedType(tag: DW_TAG_pointer_type, baseType: !10, size: 64)
!12 = !{!13}
!13 = !DILocalVariable(name: "p", arg: 1, scope: !7, file: !1, line: 5, type: !11)
!14 = !DILocation(line: 5, column: 12, scope: !7)
!15 = !DILocation(line: 6, column: 7, scope: !16)
!16 = distinct !DILexicalBlock(scope: !7, file: !1, line: 6, column: 7)
!17 = !DILocation(line: 6, column: 7, scope: !7)
!18 = !DILocation(line: 7, column: 5, scope: !19)
!19 = distinct !DILexicalBlock(scope: !16, file: !1, line: 6, column: 10)
!20 = !{i32 -2147471544}
!21 = !DILocation(line: 8, column: 3, scope: !19)
!22 = !DILocation(line: 9, column: 14, scope: !7)
!23 = !DILocation(line: 9, column: 10, scope: !7)
!24 = !{!25, !25, i64 0}
!25 = !{!"int", !26, i64 0}
!26 = !{!"omnipotent char", !27, i64 0}
!27 = !{!"Simple C/C++ TBAA"}
!28 = !DILocation(line: 9, column: 3, scope: !7)
!101 = !DIBasicType(name: "looong int", size: 64, encoding: DW_ATE_signed)
!107 = distinct !DISubprogram(name: "g", scope: !1, file: !1, line: 105, type: !8, scopeLine: 105, flags: DIFlagPrototyped, spFlags: DISPFlagDefinition | DISPFlagOptimized, unit: !0, retainedNodes: !112)
!112 = !{!113}
!113 = !DILocalVariable(name: "q", arg: 1, scope: !107, file: !1, line: 105, type: !101)
!114 = !DILocation(line: 105, column: 12, scope: !107)
!115 = !DILocation(line: 106, column: 7, scope: !116)
!116 = distinct !DILexicalBlock(scope: !107, file: !1, line: 106, column: 7)
!117 = !DILocation(line: 106, column: 7, scope: !107)
!118 = !DILocation(line: 107, column: 5, scope: !119)
!119 = distinct !DILexicalBlock(scope: !116, file: !1, line: 106, column: 10)
!120 = !{i32 -2147471544}
!121 = !DILocation(line: 108, column: 3, scope: !119)
!122 = !DILocation(line: 109, column: 14, scope: !107)
!123 = !DILocation(line: 109, column: 10, scope: !107)
!128 = !DILocation(line: 109, column: 3, scope: !107)
...
---
name: f
alignment: 4
exposesReturnsTwice: false
legalized: false
regBankSelected: false
selected: false
failedISel: false
tracksRegLiveness: true
hasWinCFI: false
registers: []
liveins:
- { reg: '$rdi', virtual-reg: '' }
frameInfo:
isFrameAddressTaken: false
isReturnAddressTaken: false
hasStackMap: false
hasPatchPoint: false
stackSize: 48
offsetAdjustment: -48
maxAlignment: 8
adjustsStack: false
hasCalls: false
stackProtector: ''
maxCallFrameSize: 0
cvBytesOfCalleeSavedRegisters: 48
hasOpaqueSPAdjustment: false
hasVAStart: false
hasMustTailInVarArgFunc: false
localFrameSize: 0
savePoint: ''
restorePoint: ''
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: -64, size: 8, alignment: 8,
stack-id: default, callee-saved-register: '', callee-saved-restored: true,
debug-info-variable: '', debug-info-expression: '', debug-info-location: '' }
constants: []
body: |
bb.0.entry:
successors: %bb.2(0x30000000), %bb.1(0x50000000)
liveins: $rdi, $rbx, $r12, $r13, $r14, $r15, $rbp
DBG_VALUE $rdi, $noreg, !13, !DIExpression(), debug-location !14
DBG_VALUE $rdi, $noreg, !13, !DIExpression(), debug-location !14
TEST64rr renamable $rdi, renamable $rdi, implicit-def $eflags, debug-location !15
JCC_1 %bb.2, 4, implicit $eflags, debug-location !17
bb.1.if.then:
successors: %bb.2(0x80000000)
liveins: $rdi, $rbp, $r15, $r14, $r13, $r12, $rbx
frame-setup PUSH64r killed $rbp, implicit-def $rsp, implicit $rsp
CFI_INSTRUCTION def_cfa_offset 16
frame-setup PUSH64r killed $r15, implicit-def $rsp, implicit $rsp
CFI_INSTRUCTION def_cfa_offset 24
frame-setup PUSH64r killed $r14, implicit-def $rsp, implicit $rsp
CFI_INSTRUCTION def_cfa_offset 32
frame-setup PUSH64r killed $r13, implicit-def $rsp, implicit $rsp
CFI_INSTRUCTION def_cfa_offset 40
frame-setup PUSH64r killed $r12, implicit-def $rsp, implicit $rsp
CFI_INSTRUCTION def_cfa_offset 48
frame-setup PUSH64r killed $rbx, implicit-def $rsp, implicit $rsp
CFI_INSTRUCTION def_cfa_offset 56
CFI_INSTRUCTION offset $rbx, -56
CFI_INSTRUCTION offset $r12, -48
CFI_INSTRUCTION offset $r13, -40
CFI_INSTRUCTION offset $r14, -32
CFI_INSTRUCTION offset $r15, -24
CFI_INSTRUCTION offset $rbp, -16
MOV64mr $rsp, 1, $noreg, -8, $noreg, killed renamable $rdi :: (store 8 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 $eflags, !20, debug-location !18
renamable $rdi = MOV64rm $rsp, 1, $noreg, -8, $noreg :: (load 8 from %stack.0)
$rbx = frame-destroy POP64r implicit-def $rsp, implicit $rsp
CFI_INSTRUCTION def_cfa_offset 48
$r12 = frame-destroy POP64r implicit-def $rsp, implicit $rsp
CFI_INSTRUCTION def_cfa_offset 40
$r13 = frame-destroy POP64r implicit-def $rsp, implicit $rsp
CFI_INSTRUCTION def_cfa_offset 32
$r14 = frame-destroy POP64r implicit-def $rsp, implicit $rsp
CFI_INSTRUCTION def_cfa_offset 24
$r15 = frame-destroy POP64r implicit-def $rsp, implicit $rsp
CFI_INSTRUCTION def_cfa_offset 16
$rbp = frame-destroy POP64r implicit-def $rsp, implicit $rsp
CFI_INSTRUCTION def_cfa_offset 8
bb.2.if.end:
liveins: $rdi, $rbx, $r12, $r13, $r14, $r15, $rbp
renamable $eax = MOV32rm killed renamable $rdi, 1, $noreg, 4, $noreg, debug-location !23 :: (load 4 from %ir.add.ptr, !tbaa !24)
RETQ $eax, debug-location !28
...
---
# This second function has been appended as a regression test against a
# crash, caused by expressions being created from spill restores that did
# not preserve fragment information. Test that no empty expressions are
# created at all, and the last block describes both variable fragments.
# CHECK-LABEL: name: g
# CHECK-NOT: !DIExpression()
# CHECK-LABEL: bb.2.if.end:
# CHECK: DBG_VALUE $rdi, $noreg, ![[QVAR]], !DIExpression(DW_OP_LLVM_fragment, 0, 32)
# CHECK-NEXT: DBG_VALUE $rbx, $noreg, ![[QVAR]], !DIExpression(DW_OP_LLVM_fragment, 32, 32)
name: g
alignment: 4
tracksRegLiveness: true
liveins:
- { reg: '$rdi', virtual-reg: '' }
frameInfo:
stackSize: 48
offsetAdjustment: -48
maxAlignment: 8
cvBytesOfCalleeSavedRegisters: 48
localFrameSize: 0
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: -64, size: 8, alignment: 8,
stack-id: default, callee-saved-register: '', callee-saved-restored: true,
debug-info-variable: '', debug-info-expression: '', debug-info-location: '' }
constants: []
body: |
bb.0.entry:
successors: %bb.1(0x50000000)
liveins: $rdi, $rbx, $r12, $r13, $r14, $r15, $rbp
DBG_VALUE $rdi, $noreg, !113, !DIExpression(DW_OP_LLVM_fragment, 0, 32), debug-location !114
TEST64rr renamable $rdi, renamable $rdi, implicit-def $eflags, debug-location !115
JMP_1 %bb.1, implicit $eflags, debug-location !117
bb.1.if.then:
successors: %bb.2(0x80000000)
liveins: $rdi, $rbp, $r15, $r14, $r13, $r12, $rbx
MOV64mr $rsp, 1, $noreg, -8, $noreg, killed renamable $rdi :: (store 8 into %stack.0)
renamable $rdi = MOV64rm $rsp, 1, $noreg, -8, $noreg :: (load 8 from %stack.0)
bb.2.if.end:
liveins: $rdi, $rbx, $r12, $r13, $r14, $r15, $rbp
DBG_VALUE $rbx, $noreg, !113, !DIExpression(DW_OP_LLVM_fragment, 32, 32), debug-location !114
MOV64mr $rsp, 1, $noreg, -8, $noreg, killed renamable $rbx :: (store 8 into %stack.0)
renamable $rsi = MOV64rm $rsp, 1, $noreg, -8, $noreg :: (load 8 from %stack.0)
renamable $eax = MOV32rm killed renamable $rsi, 1, $noreg, 4, $noreg, debug-location !123 :: (load 4 from %ir.add.ptr, !tbaa !24)
$rdi = MOV64ri 0
RETQ $eax, debug-location !128
...