test/DebugInfo/MIR/ARM/dbgcall-site-propagated-value.mir - llvm-project/llvm - Git at Google

 # RUN: llc -run-pass=livedebugvalues -o - %s | FileCheck %s

 # Based on the following C reproducer:
 #
 # extern void ext(int *);
 # extern int interesting(int *);
 # extern int *value(void);
 #
 # static void callee(int *p1, int *p2) {
 #   if (interesting(p2))
 #     for (;;)
 #       ext(p1);
 #   ext(p2);
 # }
 #
 # void caller() {
 #   int *local = value();
 #   callee(local, (int *)0xabcd);
 # }
 #
 # Generated using:
 #
 # clang -Os -fno-inline -Xclang -femit-debug-entry-values -g --target=armeb.

 --- |
   target datalayout = "E-m:e-p:32:32-Fi8-i64:64-v128:64:128-a:0:32-n32-S64"
   target triple = "armebv4t-unknown-unknown"

   ; Function Attrs: noinline nounwind optsize
   define arm_aapcs_vfpcc void @caller() #0 !dbg !20 {
   entry:
     unreachable
   }

   ; Function Attrs: noinline nounwind optsize
   define internal arm_aapcs_vfpcc void @callee(i32* %p1) unnamed_addr #0 !dbg !29 {
   entry:
     unreachable
   }

   declare !dbg !4 arm_aapcs_vfpcc i32* @value()
   declare !dbg !9 arm_aapcs_vfpcc i32 @interesting(i32*)
   declare !dbg !12 arm_aapcs_vfpcc void @ext(i32*)

   ; Function Attrs: nounwind readnone speculatable willreturn
   declare void @llvm.dbg.value(metadata, metadata, metadata) #1

   attributes #0 = { noinline nounwind optsize "frame-pointer"="all" }
   attributes #1 = { nounwind readnone speculatable willreturn }

   !llvm.dbg.cu = !{!0}
   !llvm.module.flags = !{!15, !16, !17, !18}
   !llvm.ident = !{!19}

   !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)
   !1 = !DIFile(filename: "armeb.c", directory: "/")
   !2 = !{}
   !3 = !{!4, !7, !9, !12}
   !4 = !DISubprogram(name: "value", scope: !1, file: !1, line: 3, type: !5, flags: DIFlagPrototyped, spFlags: DISPFlagOptimized, retainedNodes: !2)
   !5 = !DISubroutineType(types: !6)
   !6 = !{!7}
   !7 = !DIDerivedType(tag: DW_TAG_pointer_type, baseType: !8, size: 32)
   !8 = !DIBasicType(name: "int", size: 32, encoding: DW_ATE_signed)
   !9 = !DISubprogram(name: "interesting", scope: !1, file: !1, line: 2, type: !10, flags: DIFlagPrototyped, spFlags: DISPFlagOptimized, retainedNodes: !2)
   !10 = !DISubroutineType(types: !11)
   !11 = !{!8, !7}
   !12 = !DISubprogram(name: "ext", scope: !1, file: !1, line: 1, type: !13, flags: DIFlagPrototyped, spFlags: DISPFlagOptimized, retainedNodes: !2)
   !13 = !DISubroutineType(types: !14)
   !14 = !{null, !7}
   !15 = !{i32 2, !"Dwarf Version", i32 4}
   !16 = !{i32 2, !"Debug Info Version", i32 3}
   !17 = !{i32 1, !"wchar_size", i32 4}
   !18 = !{i32 1, !"min_enum_size", i32 4}
   !19 = !{!"clang version 10.0.0"}
   !20 = distinct !DISubprogram(name: "caller", scope: !1, file: !1, line: 12, type: !21, scopeLine: 12, flags: DIFlagAllCallsDescribed, spFlags: DISPFlagDefinition | DISPFlagOptimized, unit: !0, retainedNodes: !23)
   !21 = !DISubroutineType(types: !22)
   !22 = !{null}
   !23 = !{!24}
   !24 = !DILocalVariable(name: "local", scope: !20, file: !1, line: 13, type: !7)
   !25 = !DILocation(line: 13, scope: !20)
   !26 = !DILocation(line: 0, scope: !20)
   !27 = !DILocation(line: 14, scope: !20)
   !28 = !DILocation(line: 15, scope: !20)
   !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)
   !30 = !DISubroutineType(types: !31)
   !31 = !{null, !7, !7}
   !32 = !{!33, !34}
   !33 = !DILocalVariable(name: "p1", arg: 1, scope: !29, file: !1, line: 5, type: !7)
   !34 = !DILocalVariable(name: "p2", arg: 2, scope: !29, file: !1, line: 5, type: !7)
   !35 = !DILocation(line: 0, scope: !29)
   !36 = !DILocation(line: 6, scope: !37)
   !37 = distinct !DILexicalBlock(scope: !29, file: !1, line: 6)
   !38 = !DILocation(line: 6, scope: !29)
   !39 = !DILocation(line: 7, scope: !40)
   !40 = distinct !DILexicalBlock(scope: !37, file: !1, line: 7)
   !41 = !DILocation(line: 8, scope: !42)
   !42 = distinct !DILexicalBlock(scope: !40, file: !1, line: 7)
   !43 = !DILocation(line: 7, scope: !42)
   !44 = distinct !{!44, !39, !45}
   !45 = !DILocation(line: 8, scope: !40)
   !46 = !DILocation(line: 9, scope: !29)
   !47 = !DILocation(line: 10, scope: !29)

 ...
 ---
 name:            caller
 alignment:       4
 tracksRegLiveness: true
 body:             |
   bb.0:
     liveins: $lr

     $sp = frame-setup STMDB_UPD $sp, 14, $noreg, $r11, killed $lr
     frame-setup CFI_INSTRUCTION def_cfa_offset 8
     frame-setup CFI_INSTRUCTION offset $lr, -4
     frame-setup CFI_INSTRUCTION offset $r11, -8
     $r11 = frame-setup MOVr $sp, 14, $noreg, $noreg
     frame-setup CFI_INSTRUCTION def_cfa_register $r11
     BL @value, csr_aapcs, implicit-def dead $lr, implicit $sp, implicit-def $sp, implicit-def $r0, debug-location !25
     DBG_VALUE $r0, $noreg, !24, !DIExpression(), debug-location !26
     $sp = LDMIA_UPD $sp, 14, $noreg, def $r11, def $lr, debug-location !27
     TAILJMPd @callee, implicit $sp, implicit $sp, implicit killed $r0, debug-location !27

 ...
 ---
 name:            callee
 tracksRegLiveness: true
 stack:
   - { id: 0, name: '', type: spill-slot, offset: -4, size: 4, alignment: 4,
       stack-id: default, callee-saved-register: '$lr', callee-saved-restored: true,
       debug-info-variable: '', debug-info-expression: '', debug-info-location: '' }
   - { id: 1, name: '', type: spill-slot, offset: -8, size: 4, alignment: 4,
       stack-id: default, callee-saved-register: '$r11', callee-saved-restored: true,
       debug-info-variable: '', debug-info-expression: '', debug-info-location: '' }
   - { id: 2, name: '', type: spill-slot, offset: -12, size: 4, alignment: 4,
       stack-id: default, callee-saved-register: '$r10', callee-saved-restored: true,
       debug-info-variable: '', debug-info-expression: '', debug-info-location: '' }
   - { id: 3, name: '', type: spill-slot, offset: -16, size: 4, alignment: 4,
       stack-id: default, callee-saved-register: '$r4', callee-saved-restored: true,
       debug-info-variable: '', debug-info-expression: '', debug-info-location: '' }
 body:             |
   bb.0:
     successors: %bb.2(0x30000000), %bb.1(0x50000000)
     liveins: $r0, $r4, $r10, $lr

     DBG_VALUE $r0, $noreg, !33, !DIExpression(), debug-location !35
     $sp = frame-setup STMDB_UPD $sp, 14, $noreg, killed $r4, killed $r10, $r11, killed $lr
     frame-setup CFI_INSTRUCTION def_cfa_offset 16
     frame-setup CFI_INSTRUCTION offset $lr, -4
     frame-setup CFI_INSTRUCTION offset $r11, -8
     frame-setup CFI_INSTRUCTION offset $r10, -12
     frame-setup CFI_INSTRUCTION offset $r4, -16
     $r11 = frame-setup ADDri $sp, 8, 14, $noreg, $noreg
     frame-setup CFI_INSTRUCTION def_cfa $r11, 8
     $r4 = MOVr killed $r0, 14, $noreg, $noreg
     DBG_VALUE $r4, $noreg, !33, !DIExpression(), debug-location !35
     $r0 = MOVi 205, 14, $noreg, $noreg
     $r0 = ORRri killed $r0, 43776, 14, $noreg, $noreg
     ; The MOVI and ORRri produce the second parameter's (!34) value which has
     ; been propagated from caller().
     DBG_VALUE $r0, $noreg, !34, !DIExpression(), debug-location !35
     BL @interesting, csr_aapcs, implicit-def dead $lr, implicit $sp, implicit killed $r0, implicit-def $sp, implicit-def $r0, debug-location !36
     CMPri killed renamable $r0, 0, 14, $noreg, implicit-def $cpsr, debug-location !38
     Bcc %bb.2, 0, killed $cpsr, debug-location !38

   bb.1:
     liveins: $r4

     $r0 = MOVr $r4, 14, $noreg, $noreg, debug-location !41
     BL @ext, csr_aapcs, implicit-def dead $lr, implicit $sp, implicit killed $r0, implicit-def $sp, debug-location !41
     B %bb.1, debug-location !43

   bb.2:
     $r0 = MOVi 205, 14, $noreg, $noreg
     $r0 = ORRri killed $r0, 43776, 14, $noreg, $noreg
     $sp = LDMIA_UPD $sp, 14, $noreg, def $r4, def $r10, def $r11, def $lr, debug-location !46
     TAILJMPd @ext, implicit $sp, implicit $sp, implicit killed $r0, debug-location !46

 ...

 # In this test case the second parameter's value has been propagated from the
 # caller to the callee, so we should not emit any entry value DBG_VALUEs for
 # that parameter. The second parameter reuses the first parameter's register
 # ($r0), and previously we would incorrectly emit an entry value for the
 # parameter using that register.

 # CHECK-DAG: ![[P1:[0-9]+]] = !DILocalVariable(name: "p1", arg: 1
 # CHECK-DAG: ![[P2:[0-9]+]] = !DILocalVariable(name: "p2", arg: 2

 # CHECK-NOT: DBG_VALUE $r0, $noreg, ![[P2]], !DIExpression(DW_OP_LLVM_entry_value

 # CHECK: DBG_VALUE $r0, $noreg, ![[P1]], !DIExpression(DW_OP_LLVM_entry_value

 # CHECK-NOT: DBG_VALUE $r0, $noreg, ![[P2]], !DIExpression(DW_OP_LLVM_entry_value
	# RUN: llc -run-pass=livedebugvalues -o - %s \| FileCheck %s

	# Based on the following C reproducer:
	#
	# extern void ext(int *);
	# extern int interesting(int *);
	# extern int *value(void);
	#
	# static void callee(int p1, int p2) {
	# if (interesting(p2))
	# for (;;)
	# ext(p1);
	# ext(p2);
	# }
	#
	# void caller() {
	# int *local = value();
	# callee(local, (int *)0xabcd);
	# }
	#
	# Generated using:
	#
	# clang -Os -fno-inline -Xclang -femit-debug-entry-values -g --target=armeb.

	--- \|
	target datalayout = "E-m:e-p:32:32-Fi8-i64:64-v128:64:128-a:0:32-n32-S64"
	target triple = "armebv4t-unknown-unknown"

	; Function Attrs: noinline nounwind optsize
	define arm_aapcs_vfpcc void @caller() #0 !dbg !20 {
	entry:
	unreachable
	}

	; Function Attrs: noinline nounwind optsize
	define internal arm_aapcs_vfpcc void @callee(i32* %p1) unnamed_addr #0 !dbg !29 {
	entry:
	unreachable
	}

	declare !dbg !4 arm_aapcs_vfpcc i32* @value()
	declare !dbg !9 arm_aapcs_vfpcc i32 @interesting(i32*)
	declare !dbg !12 arm_aapcs_vfpcc void @ext(i32*)

	; Function Attrs: nounwind readnone speculatable willreturn
	declare void @llvm.dbg.value(metadata, metadata, metadata) #1

	attributes #0 = { noinline nounwind optsize "frame-pointer"="all" }
	attributes #1 = { nounwind readnone speculatable willreturn }

	!llvm.dbg.cu = !{!0}
	!llvm.module.flags = !{!15, !16, !17, !18}
	!llvm.ident = !{!19}

	!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)
	!1 = !DIFile(filename: "armeb.c", directory: "/")
	!2 = !{}
	!3 = !{!4, !7, !9, !12}
	!4 = !DISubprogram(name: "value", scope: !1, file: !1, line: 3, type: !5, flags: DIFlagPrototyped, spFlags: DISPFlagOptimized, retainedNodes: !2)
	!5 = !DISubroutineType(types: !6)
	!6 = !{!7}
	!7 = !DIDerivedType(tag: DW_TAG_pointer_type, baseType: !8, size: 32)
	!8 = !DIBasicType(name: "int", size: 32, encoding: DW_ATE_signed)
	!9 = !DISubprogram(name: "interesting", scope: !1, file: !1, line: 2, type: !10, flags: DIFlagPrototyped, spFlags: DISPFlagOptimized, retainedNodes: !2)
	!10 = !DISubroutineType(types: !11)
	!11 = !{!8, !7}
	!12 = !DISubprogram(name: "ext", scope: !1, file: !1, line: 1, type: !13, flags: DIFlagPrototyped, spFlags: DISPFlagOptimized, retainedNodes: !2)
	!13 = !DISubroutineType(types: !14)
	!14 = !{null, !7}
	!15 = !{i32 2, !"Dwarf Version", i32 4}
	!16 = !{i32 2, !"Debug Info Version", i32 3}
	!17 = !{i32 1, !"wchar_size", i32 4}
	!18 = !{i32 1, !"min_enum_size", i32 4}
	!19 = !{!"clang version 10.0.0"}
	!20 = distinct !DISubprogram(name: "caller", scope: !1, file: !1, line: 12, type: !21, scopeLine: 12, flags: DIFlagAllCallsDescribed, spFlags: DISPFlagDefinition \| DISPFlagOptimized, unit: !0, retainedNodes: !23)
	!21 = !DISubroutineType(types: !22)
	!22 = !{null}
	!23 = !{!24}
	!24 = !DILocalVariable(name: "local", scope: !20, file: !1, line: 13, type: !7)
	!25 = !DILocation(line: 13, scope: !20)
	!26 = !DILocation(line: 0, scope: !20)
	!27 = !DILocation(line: 14, scope: !20)
	!28 = !DILocation(line: 15, scope: !20)
	!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)
	!30 = !DISubroutineType(types: !31)
	!31 = !{null, !7, !7}
	!32 = !{!33, !34}
	!33 = !DILocalVariable(name: "p1", arg: 1, scope: !29, file: !1, line: 5, type: !7)
	!34 = !DILocalVariable(name: "p2", arg: 2, scope: !29, file: !1, line: 5, type: !7)
	!35 = !DILocation(line: 0, scope: !29)
	!36 = !DILocation(line: 6, scope: !37)
	!37 = distinct !DILexicalBlock(scope: !29, file: !1, line: 6)
	!38 = !DILocation(line: 6, scope: !29)
	!39 = !DILocation(line: 7, scope: !40)
	!40 = distinct !DILexicalBlock(scope: !37, file: !1, line: 7)
	!41 = !DILocation(line: 8, scope: !42)
	!42 = distinct !DILexicalBlock(scope: !40, file: !1, line: 7)
	!43 = !DILocation(line: 7, scope: !42)
	!44 = distinct !{!44, !39, !45}
	!45 = !DILocation(line: 8, scope: !40)
	!46 = !DILocation(line: 9, scope: !29)
	!47 = !DILocation(line: 10, scope: !29)

	...
	---
	name: caller
	alignment: 4
	tracksRegLiveness: true
	body: \|
	bb.0:
	liveins: $lr

	$sp = frame-setup STMDB_UPD $sp, 14, $noreg, $r11, killed $lr
	frame-setup CFI_INSTRUCTION def_cfa_offset 8
	frame-setup CFI_INSTRUCTION offset $lr, -4
	frame-setup CFI_INSTRUCTION offset $r11, -8
	$r11 = frame-setup MOVr $sp, 14, $noreg, $noreg
	frame-setup CFI_INSTRUCTION def_cfa_register $r11
	BL @value, csr_aapcs, implicit-def dead $lr, implicit $sp, implicit-def $sp, implicit-def $r0, debug-location !25
	DBG_VALUE $r0, $noreg, !24, !DIExpression(), debug-location !26
	$sp = LDMIA_UPD $sp, 14, $noreg, def $r11, def $lr, debug-location !27
	TAILJMPd @callee, implicit $sp, implicit $sp, implicit killed $r0, debug-location !27

	...
	---
	name: callee
	tracksRegLiveness: true
	stack:
	- { id: 0, name: '', type: spill-slot, offset: -4, size: 4, alignment: 4,
	stack-id: default, callee-saved-register: '$lr', callee-saved-restored: true,
	debug-info-variable: '', debug-info-expression: '', debug-info-location: '' }
	- { id: 1, name: '', type: spill-slot, offset: -8, size: 4, alignment: 4,
	stack-id: default, callee-saved-register: '$r11', callee-saved-restored: true,
	debug-info-variable: '', debug-info-expression: '', debug-info-location: '' }
	- { id: 2, name: '', type: spill-slot, offset: -12, size: 4, alignment: 4,
	stack-id: default, callee-saved-register: '$r10', callee-saved-restored: true,
	debug-info-variable: '', debug-info-expression: '', debug-info-location: '' }
	- { id: 3, name: '', type: spill-slot, offset: -16, size: 4, alignment: 4,
	stack-id: default, callee-saved-register: '$r4', callee-saved-restored: true,
	debug-info-variable: '', debug-info-expression: '', debug-info-location: '' }
	body: \|
	bb.0:
	successors: %bb.2(0x30000000), %bb.1(0x50000000)
	liveins: $r0, $r4, $r10, $lr

	DBG_VALUE $r0, $noreg, !33, !DIExpression(), debug-location !35
	$sp = frame-setup STMDB_UPD $sp, 14, $noreg, killed $r4, killed $r10, $r11, killed $lr
	frame-setup CFI_INSTRUCTION def_cfa_offset 16
	frame-setup CFI_INSTRUCTION offset $lr, -4
	frame-setup CFI_INSTRUCTION offset $r11, -8
	frame-setup CFI_INSTRUCTION offset $r10, -12
	frame-setup CFI_INSTRUCTION offset $r4, -16
	$r11 = frame-setup ADDri $sp, 8, 14, $noreg, $noreg
	frame-setup CFI_INSTRUCTION def_cfa $r11, 8
	$r4 = MOVr killed $r0, 14, $noreg, $noreg
	DBG_VALUE $r4, $noreg, !33, !DIExpression(), debug-location !35
	$r0 = MOVi 205, 14, $noreg, $noreg
	$r0 = ORRri killed $r0, 43776, 14, $noreg, $noreg
	; The MOVI and ORRri produce the second parameter's (!34) value which has
	; been propagated from caller().
	DBG_VALUE $r0, $noreg, !34, !DIExpression(), debug-location !35
	BL @interesting, csr_aapcs, implicit-def dead $lr, implicit $sp, implicit killed $r0, implicit-def $sp, implicit-def $r0, debug-location !36
	CMPri killed renamable $r0, 0, 14, $noreg, implicit-def $cpsr, debug-location !38
	Bcc %bb.2, 0, killed $cpsr, debug-location !38

	bb.1:
	liveins: $r4

	$r0 = MOVr $r4, 14, $noreg, $noreg, debug-location !41
	BL @ext, csr_aapcs, implicit-def dead $lr, implicit $sp, implicit killed $r0, implicit-def $sp, debug-location !41
	B %bb.1, debug-location !43

	bb.2:
	$r0 = MOVi 205, 14, $noreg, $noreg
	$r0 = ORRri killed $r0, 43776, 14, $noreg, $noreg
	$sp = LDMIA_UPD $sp, 14, $noreg, def $r4, def $r10, def $r11, def $lr, debug-location !46
	TAILJMPd @ext, implicit $sp, implicit $sp, implicit killed $r0, debug-location !46

	...

	# In this test case the second parameter's value has been propagated from the
	# caller to the callee, so we should not emit any entry value DBG_VALUEs for
	# that parameter. The second parameter reuses the first parameter's register
	# ($r0), and previously we would incorrectly emit an entry value for the
	# parameter using that register.

	# CHECK-DAG: ![[P1:[0-9]+]] = !DILocalVariable(name: "p1", arg: 1
	# CHECK-DAG: ![[P2:[0-9]+]] = !DILocalVariable(name: "p2", arg: 2

	# CHECK-NOT: DBG_VALUE $r0, $noreg, ![[P2]], !DIExpression(DW_OP_LLVM_entry_value

	# CHECK: DBG_VALUE $r0, $noreg, ![[P1]], !DIExpression(DW_OP_LLVM_entry_value

	# CHECK-NOT: DBG_VALUE $r0, $noreg, ![[P2]], !DIExpression(DW_OP_LLVM_entry_value