195 lines
8.5 KiB
Plaintext
195 lines
8.5 KiB
Plaintext
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# RUN: llc -run-pass=livedebugvalues -o - %s | FileCheck %s
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# Based on the following C reproducer:
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#
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# extern void ext(int *);
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# extern int interesting(int *);
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# extern int *value(void);
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#
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# static void callee(int *p1, int *p2) {
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# if (interesting(p2))
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# for (;;)
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# ext(p1);
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# ext(p2);
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# }
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#
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# void caller() {
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# int *local = value();
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# callee(local, (int *)0xabcd);
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# }
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#
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# Generated using:
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#
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# clang -Os -fno-inline -Xclang -femit-debug-entry-values -g --target=armeb.
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--- |
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target datalayout = "E-m:e-p:32:32-Fi8-i64:64-v128:64:128-a:0:32-n32-S64"
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target triple = "armebv4t-unknown-unknown"
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; Function Attrs: noinline nounwind optsize
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define arm_aapcs_vfpcc void @caller() #0 !dbg !20 {
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entry:
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unreachable
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}
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; Function Attrs: noinline nounwind optsize
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define internal arm_aapcs_vfpcc void @callee(i32* %p1) unnamed_addr #0 !dbg !29 {
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entry:
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unreachable
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}
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declare !dbg !4 arm_aapcs_vfpcc i32* @value()
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declare !dbg !9 arm_aapcs_vfpcc i32 @interesting(i32*)
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declare !dbg !12 arm_aapcs_vfpcc void @ext(i32*)
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; Function Attrs: nounwind readnone speculatable willreturn
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declare void @llvm.dbg.value(metadata, metadata, metadata) #1
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attributes #0 = { noinline nounwind optsize "frame-pointer"="all" }
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attributes #1 = { nounwind readnone speculatable willreturn }
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!llvm.dbg.cu = !{!0}
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!llvm.module.flags = !{!15, !16, !17, !18}
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!llvm.ident = !{!19}
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!0 = distinct !DICompileUnit(language: DW_LANG_C99, file: !1, producer: "clang version 10.0.0", isOptimized: true, runtimeVersion: 0, emissionKind: FullDebug, enums: !2, retainedTypes: !3, nameTableKind: None)
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!1 = !DIFile(filename: "armeb.c", directory: "/")
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!2 = !{}
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!3 = !{!4, !7, !9, !12}
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!4 = !DISubprogram(name: "value", scope: !1, file: !1, line: 3, type: !5, flags: DIFlagPrototyped, spFlags: DISPFlagOptimized, retainedNodes: !2)
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!5 = !DISubroutineType(types: !6)
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!6 = !{!7}
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!7 = !DIDerivedType(tag: DW_TAG_pointer_type, baseType: !8, size: 32)
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!8 = !DIBasicType(name: "int", size: 32, encoding: DW_ATE_signed)
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!9 = !DISubprogram(name: "interesting", scope: !1, file: !1, line: 2, type: !10, flags: DIFlagPrototyped, spFlags: DISPFlagOptimized, retainedNodes: !2)
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!10 = !DISubroutineType(types: !11)
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!11 = !{!8, !7}
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!12 = !DISubprogram(name: "ext", scope: !1, file: !1, line: 1, type: !13, flags: DIFlagPrototyped, spFlags: DISPFlagOptimized, retainedNodes: !2)
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!13 = !DISubroutineType(types: !14)
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!14 = !{null, !7}
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!15 = !{i32 2, !"Dwarf Version", i32 4}
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!16 = !{i32 2, !"Debug Info Version", i32 3}
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!17 = !{i32 1, !"wchar_size", i32 4}
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!18 = !{i32 1, !"min_enum_size", i32 4}
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!19 = !{!"clang version 10.0.0"}
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!20 = distinct !DISubprogram(name: "caller", scope: !1, file: !1, line: 12, type: !21, scopeLine: 12, flags: DIFlagAllCallsDescribed, spFlags: DISPFlagDefinition | DISPFlagOptimized, unit: !0, retainedNodes: !23)
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!21 = !DISubroutineType(types: !22)
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!22 = !{null}
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!23 = !{!24}
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!24 = !DILocalVariable(name: "local", scope: !20, file: !1, line: 13, type: !7)
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!25 = !DILocation(line: 13, scope: !20)
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!26 = !DILocation(line: 0, scope: !20)
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!27 = !DILocation(line: 14, scope: !20)
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!28 = !DILocation(line: 15, scope: !20)
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!29 = distinct !DISubprogram(name: "callee", scope: !1, file: !1, line: 5, type: !30, scopeLine: 5, flags: DIFlagPrototyped | DIFlagAllCallsDescribed, spFlags: DISPFlagLocalToUnit | DISPFlagDefinition | DISPFlagOptimized, unit: !0, retainedNodes: !32)
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!30 = !DISubroutineType(types: !31)
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!31 = !{null, !7, !7}
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!32 = !{!33, !34}
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!33 = !DILocalVariable(name: "p1", arg: 1, scope: !29, file: !1, line: 5, type: !7)
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!34 = !DILocalVariable(name: "p2", arg: 2, scope: !29, file: !1, line: 5, type: !7)
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!35 = !DILocation(line: 0, scope: !29)
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!36 = !DILocation(line: 6, scope: !37)
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!37 = distinct !DILexicalBlock(scope: !29, file: !1, line: 6)
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!38 = !DILocation(line: 6, scope: !29)
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!39 = !DILocation(line: 7, scope: !40)
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!40 = distinct !DILexicalBlock(scope: !37, file: !1, line: 7)
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!41 = !DILocation(line: 8, scope: !42)
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!42 = distinct !DILexicalBlock(scope: !40, file: !1, line: 7)
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!43 = !DILocation(line: 7, scope: !42)
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!44 = distinct !{!44, !39, !45}
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!45 = !DILocation(line: 8, scope: !40)
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!46 = !DILocation(line: 9, scope: !29)
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!47 = !DILocation(line: 10, scope: !29)
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...
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---
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name: caller
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alignment: 4
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tracksRegLiveness: true
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body: |
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bb.0:
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liveins: $lr
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$sp = frame-setup STMDB_UPD $sp, 14, $noreg, $r11, killed $lr
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frame-setup CFI_INSTRUCTION def_cfa_offset 8
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frame-setup CFI_INSTRUCTION offset $lr, -4
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frame-setup CFI_INSTRUCTION offset $r11, -8
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$r11 = frame-setup MOVr $sp, 14, $noreg, $noreg
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frame-setup CFI_INSTRUCTION def_cfa_register $r11
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BL @value, csr_aapcs, implicit-def dead $lr, implicit $sp, implicit-def $sp, implicit-def $r0, debug-location !25
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DBG_VALUE $r0, $noreg, !24, !DIExpression(), debug-location !26
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$sp = LDMIA_UPD $sp, 14, $noreg, def $r11, def $lr, debug-location !27
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TAILJMPd @callee, implicit $sp, implicit $sp, implicit killed $r0, debug-location !27
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...
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---
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name: callee
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tracksRegLiveness: true
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stack:
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- { id: 0, name: '', type: spill-slot, offset: -4, size: 4, alignment: 4,
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stack-id: default, callee-saved-register: '$lr', callee-saved-restored: true,
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debug-info-variable: '', debug-info-expression: '', debug-info-location: '' }
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- { id: 1, name: '', type: spill-slot, offset: -8, size: 4, alignment: 4,
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stack-id: default, callee-saved-register: '$r11', callee-saved-restored: true,
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debug-info-variable: '', debug-info-expression: '', debug-info-location: '' }
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- { id: 2, name: '', type: spill-slot, offset: -12, size: 4, alignment: 4,
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stack-id: default, callee-saved-register: '$r10', callee-saved-restored: true,
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debug-info-variable: '', debug-info-expression: '', debug-info-location: '' }
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- { id: 3, name: '', type: spill-slot, offset: -16, size: 4, alignment: 4,
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stack-id: default, callee-saved-register: '$r4', callee-saved-restored: true,
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debug-info-variable: '', debug-info-expression: '', debug-info-location: '' }
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body: |
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bb.0:
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successors: %bb.2(0x30000000), %bb.1(0x50000000)
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liveins: $r0, $r4, $r10, $lr
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DBG_VALUE $r0, $noreg, !33, !DIExpression(), debug-location !35
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$sp = frame-setup STMDB_UPD $sp, 14, $noreg, killed $r4, killed $r10, $r11, killed $lr
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frame-setup CFI_INSTRUCTION def_cfa_offset 16
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frame-setup CFI_INSTRUCTION offset $lr, -4
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frame-setup CFI_INSTRUCTION offset $r11, -8
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frame-setup CFI_INSTRUCTION offset $r10, -12
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frame-setup CFI_INSTRUCTION offset $r4, -16
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$r11 = frame-setup ADDri $sp, 8, 14, $noreg, $noreg
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frame-setup CFI_INSTRUCTION def_cfa $r11, 8
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$r4 = MOVr killed $r0, 14, $noreg, $noreg
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DBG_VALUE $r4, $noreg, !33, !DIExpression(), debug-location !35
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$r0 = MOVi 205, 14, $noreg, $noreg
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$r0 = ORRri killed $r0, 43776, 14, $noreg, $noreg
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; The MOVI and ORRri produce the second parameter's (!34) value which has
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; been propagated from caller().
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DBG_VALUE $r0, $noreg, !34, !DIExpression(), debug-location !35
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BL @interesting, csr_aapcs, implicit-def dead $lr, implicit $sp, implicit killed $r0, implicit-def $sp, implicit-def $r0, debug-location !36
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CMPri killed renamable $r0, 0, 14, $noreg, implicit-def $cpsr, debug-location !38
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Bcc %bb.2, 0, killed $cpsr, debug-location !38
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bb.1:
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liveins: $r4
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$r0 = MOVr $r4, 14, $noreg, $noreg, debug-location !41
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BL @ext, csr_aapcs, implicit-def dead $lr, implicit $sp, implicit killed $r0, implicit-def $sp, debug-location !41
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B %bb.1, debug-location !43
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bb.2:
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$r0 = MOVi 205, 14, $noreg, $noreg
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$r0 = ORRri killed $r0, 43776, 14, $noreg, $noreg
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$sp = LDMIA_UPD $sp, 14, $noreg, def $r4, def $r10, def $r11, def $lr, debug-location !46
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TAILJMPd @ext, implicit $sp, implicit $sp, implicit killed $r0, debug-location !46
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...
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# In this test case the second parameter's value has been propagated from the
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# caller to the callee, so we should not emit any entry value DBG_VALUEs for
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# that parameter. The second parameter reuses the first parameter's register
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# ($r0), and previously we would incorrectly emit an entry value for the
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# parameter using that register.
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# CHECK-DAG: ![[P1:[0-9]+]] = !DILocalVariable(name: "p1", arg: 1
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# CHECK-DAG: ![[P2:[0-9]+]] = !DILocalVariable(name: "p2", arg: 2
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# CHECK-NOT: DBG_VALUE $r0, $noreg, ![[P2]], !DIExpression(DW_OP_LLVM_entry_value
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# CHECK: DBG_VALUE $r0, $noreg, ![[P1]], !DIExpression(DW_OP_LLVM_entry_value
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# CHECK-NOT: DBG_VALUE $r0, $noreg, ![[P2]], !DIExpression(DW_OP_LLVM_entry_value
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