llvm/test/DebugInfo/MIR/InstrRef/dbg-phis-in-ldv.mir - llvm-project - Git at Google

 # RUN: llc %s -o - -mtriple=x86_64-unknown-unknown \
 # RUN:    -experimental-debug-variable-locations -run-pass=livedebugvalues\
 # RUN:    | FileCheck %s
 #
 # Test that a DBG_INSTR_REF that refers to a DBG_PHI, will be translated into a
 # DBG_VALUE of the value read at that DBG_PHI. Same original code as
 # phi-coalescing.mir.
 #
 --- |
   ; ModuleID = 'phi-coalescing.mir'
   source_filename = "test.c"
   target datalayout = "e-m:e-p270:32:32-p271:32:32-p272:64:64-i64:64-f80:128-n8:16:32:64-S128"
   target triple = "x86_64-unknown-linux-gnu"

   define dso_local i32 @foo(i64 %bar, i64 %baz) !dbg !7 {
   entry:
     call void @llvm.dbg.value(metadata i64 %bar, metadata !12, metadata !DIExpression()), !dbg !13
     call void @llvm.dbg.value(metadata i64 %baz, metadata !14, metadata !DIExpression()), !dbg !13
     call void @ext(i64 %bar), !dbg !15
     %add = add nsw i64 %bar, 12, !dbg !16
     call void @llvm.dbg.value(metadata i64 %add, metadata !12, metadata !DIExpression()), !dbg !13
     call void @ext(i64 %add), !dbg !17
     %call = call i64 @getlong(), !dbg !18
     %tobool = icmp ne i64 %call, 0, !dbg !18
     br i1 %tobool, label %if.then, label %if.end, !dbg !20

   if.then:                                          ; preds = %entry
     %add1 = add nsw i64 %add, 1, !dbg !21
     call void @llvm.dbg.value(metadata i64 %add1, metadata !12, metadata !DIExpression()), !dbg !13
     br label %if.end, !dbg !22

   if.end:                                           ; preds = %if.then, %entry
     %bar.addr.0 = phi i64 [ %add1, %if.then ], [ %add, %entry ], !dbg !13
     call void @llvm.dbg.value(metadata i64 %bar.addr.0, metadata !12, metadata !DIExpression()), !dbg !13
     %add2 = add nsw i64 %bar.addr.0, %baz, !dbg !23
     call void @llvm.dbg.value(metadata i64 %add2, metadata !12, metadata !DIExpression()), !dbg !13
     call void @ext(i64 %add2), !dbg !24
     %conv = trunc i64 %add2 to i32, !dbg !25
     ret i32 %conv, !dbg !26
   }

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

   declare dso_local void @ext(i64)

   declare dso_local i64 @getlong()

   ; Function Attrs: nounwind readnone speculatable willreturn
   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, isOptimized: false, runtimeVersion: 0, emissionKind: FullDebug, enums: !2, splitDebugInlining: false, nameTableKind: None)
   !1 = !DIFile(filename: "test.c", directory: "/tmp/out.c")
   !2 = !{}
   !3 = !{i32 7, !"Dwarf Version", i32 4}
   !4 = !{i32 2, !"Debug Info Version", i32 3}
   !5 = !{i32 1, !"wchar_size", i32 4}
   !6 = !{!""}
   !7 = distinct !DISubprogram(name: "foo", scope: !1, file: !1, line: 3, type: !8, scopeLine: 3, flags: DIFlagPrototyped, spFlags: DISPFlagDefinition, unit: !0, retainedNodes: !2)
   !8 = !DISubroutineType(types: !9)
   !9 = !{!10, !11, !11}
   !10 = !DIBasicType(name: "int", size: 32, encoding: DW_ATE_signed)
   !11 = !DIBasicType(name: "long int", size: 64, encoding: DW_ATE_signed)
   !12 = !DILocalVariable(name: "bar", arg: 1, scope: !7, file: !1, line: 3, type: !11)
   !13 = !DILocation(line: 0, scope: !7)
   !14 = !DILocalVariable(name: "baz", arg: 2, scope: !7, file: !1, line: 3, type: !11)
   !15 = !DILocation(line: 4, column: 3, scope: !7)
   !16 = !DILocation(line: 5, column: 7, scope: !7)
   !17 = !DILocation(line: 6, column: 3, scope: !7)
   !18 = !DILocation(line: 8, column: 7, scope: !19)
   !19 = distinct !DILexicalBlock(scope: !7, file: !1, line: 8, column: 7)
   !20 = !DILocation(line: 8, column: 7, scope: !7)
   !21 = !DILocation(line: 9, column: 9, scope: !19)
   !22 = !DILocation(line: 9, column: 5, scope: !19)
   !23 = !DILocation(line: 11, column: 7, scope: !7)
   !24 = !DILocation(line: 12, column: 3, scope: !7)
   !25 = !DILocation(line: 13, column: 10, scope: !7)
   !26 = !DILocation(line: 13, column: 3, scope: !7)

 ...
 ---
 name:            foo
 alignment:       16
 tracksRegLiveness: true
 liveins:
   - { reg: '$rdi' }
   - { reg: '$rsi' }
 frameInfo:
   stackSize:       24
   offsetAdjustment: -24
   maxAlignment:    1
   adjustsStack:    true
   hasCalls:        true
   maxCallFrameSize: 0
   cvBytesOfCalleeSavedRegisters: 16
 fixedStack:
   - { id: 0, type: spill-slot, offset: -24, size: 8, alignment: 8, callee-saved-register: '$rbx' }
   - { id: 1, type: spill-slot, offset: -16, size: 8, alignment: 16, callee-saved-register: '$r14' }
 machineFunctionInfo: {}
 body:             |
   bb.0.entry:
     liveins: $rdi, $rsi, $r14, $rbx

     frame-setup PUSH64r killed $r14, implicit-def $rsp, implicit $rsp
     CFI_INSTRUCTION def_cfa_offset 16
     frame-setup PUSH64r killed $rbx, implicit-def $rsp, implicit $rsp
     CFI_INSTRUCTION def_cfa_offset 24
     frame-setup PUSH64r undef $rax, implicit-def $rsp, implicit $rsp
     CFI_INSTRUCTION def_cfa_offset 32
     CFI_INSTRUCTION offset $rbx, -24
     CFI_INSTRUCTION offset $r14, -16
     $r14 = MOV64rr $rsi
     $rbx = MOV64rr $rdi
     CALL64pcrel32 @ext, csr_64, implicit $rsp, implicit $ssp, implicit $rdi, debug-location !15
     renamable $rbx = ADD64ri32 killed renamable $rbx, 12, implicit-def $eflags, debug-location !16
     $rdi = MOV64rr $rbx, debug-location !17
     CALL64pcrel32 @ext, csr_64, implicit $rsp, implicit $ssp, implicit $rdi, debug-location !17
     CALL64pcrel32 @getlong, csr_64, implicit $rsp, implicit $ssp, implicit-def $rax, debug-location !18
     CMP64ri8 killed renamable $rax, 0, implicit-def $eflags, debug-location !18
     JCC_1 %bb.2, 4, implicit $eflags, debug-location !20

   bb.1.if.then:
     liveins: $rbx, $r14

     renamable $rbx = ADD64ri32 killed renamable $rbx, 1, implicit-def $eflags, debug-location !21

   bb.2.if.end:
     liveins: $rbx, $r14

     DBG_PHI $rbx, 1
     $rax = COPY $rbx
     $rbx = MOV64ri 0
     DBG_INSTR_REF 1, 0, !12, !DIExpression(), debug-location !13

     ; This sequence should mark the contents of rbx on block entry as being the
     ; value for the variable at this DBG_INSTR_REF. We've force it to be in
     ; $rax now, so we should see a DBG_VALUE for rax:
     ; CHECK:      DBG_PHI $rbx, 1
     ; CHECK-NEXT: $rax = COPY $rbx
     ; CHECK-NEXT: $rbx = MOV64ri 0
     ; CHECK-NEXT: DBG_INSTR_REF 1, 0
     ; CHECK-NEXT: DBG_VALUE $rax, $noreg

     $rbx = COPY $rax
     renamable $rbx = ADD64rr killed renamable $rbx, killed renamable $r14, implicit-def $eflags, debug-location !23
     DBG_VALUE $rbx, $noreg, !12, !DIExpression(), debug-location !13
     $rdi = MOV64rr $rbx, debug-location !24
     CALL64pcrel32 @ext, csr_64, implicit $rsp, implicit $ssp, implicit $rdi, debug-location !24
     $eax = MOV32rr $ebx, implicit killed $rbx, debug-location !26
     $rsp = frame-destroy ADD64ri8 $rsp, 8, implicit-def dead $eflags, debug-location !26
     CFI_INSTRUCTION def_cfa_offset 24, debug-location !26
     $rbx = frame-destroy POP64r implicit-def $rsp, implicit $rsp, debug-location !26
     CFI_INSTRUCTION def_cfa_offset 16, debug-location !26
     $r14 = frame-destroy POP64r implicit-def $rsp, implicit $rsp, debug-location !26
     CFI_INSTRUCTION def_cfa_offset 8, debug-location !26
     RET64 implicit $eax, debug-location !26

 ...
	# RUN: llc %s -o - -mtriple=x86_64-unknown-unknown \
	# RUN: -experimental-debug-variable-locations -run-pass=livedebugvalues\
	# RUN: \| FileCheck %s
	#
	# Test that a DBG_INSTR_REF that refers to a DBG_PHI, will be translated into a
	# DBG_VALUE of the value read at that DBG_PHI. Same original code as
	# phi-coalescing.mir.
	#
	--- \|
	; ModuleID = 'phi-coalescing.mir'
	source_filename = "test.c"
	target datalayout = "e-m:e-p270:32:32-p271:32:32-p272:64:64-i64:64-f80:128-n8:16:32:64-S128"
	target triple = "x86_64-unknown-linux-gnu"

	define dso_local i32 @foo(i64 %bar, i64 %baz) !dbg !7 {
	entry:
	call void @llvm.dbg.value(metadata i64 %bar, metadata !12, metadata !DIExpression()), !dbg !13
	call void @llvm.dbg.value(metadata i64 %baz, metadata !14, metadata !DIExpression()), !dbg !13
	call void @ext(i64 %bar), !dbg !15
	%add = add nsw i64 %bar, 12, !dbg !16
	call void @llvm.dbg.value(metadata i64 %add, metadata !12, metadata !DIExpression()), !dbg !13
	call void @ext(i64 %add), !dbg !17
	%call = call i64 @getlong(), !dbg !18
	%tobool = icmp ne i64 %call, 0, !dbg !18
	br i1 %tobool, label %if.then, label %if.end, !dbg !20

	if.then: ; preds = %entry
	%add1 = add nsw i64 %add, 1, !dbg !21
	call void @llvm.dbg.value(metadata i64 %add1, metadata !12, metadata !DIExpression()), !dbg !13
	br label %if.end, !dbg !22

	if.end: ; preds = %if.then, %entry
	%bar.addr.0 = phi i64 [ %add1, %if.then ], [ %add, %entry ], !dbg !13
	call void @llvm.dbg.value(metadata i64 %bar.addr.0, metadata !12, metadata !DIExpression()), !dbg !13
	%add2 = add nsw i64 %bar.addr.0, %baz, !dbg !23
	call void @llvm.dbg.value(metadata i64 %add2, metadata !12, metadata !DIExpression()), !dbg !13
	call void @ext(i64 %add2), !dbg !24
	%conv = trunc i64 %add2 to i32, !dbg !25
	ret i32 %conv, !dbg !26
	}

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

	declare dso_local void @ext(i64)

	declare dso_local i64 @getlong()

	; Function Attrs: nounwind readnone speculatable willreturn
	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, isOptimized: false, runtimeVersion: 0, emissionKind: FullDebug, enums: !2, splitDebugInlining: false, nameTableKind: None)
	!1 = !DIFile(filename: "test.c", directory: "/tmp/out.c")
	!2 = !{}
	!3 = !{i32 7, !"Dwarf Version", i32 4}
	!4 = !{i32 2, !"Debug Info Version", i32 3}
	!5 = !{i32 1, !"wchar_size", i32 4}
	!6 = !{!""}
	!7 = distinct !DISubprogram(name: "foo", scope: !1, file: !1, line: 3, type: !8, scopeLine: 3, flags: DIFlagPrototyped, spFlags: DISPFlagDefinition, unit: !0, retainedNodes: !2)
	!8 = !DISubroutineType(types: !9)
	!9 = !{!10, !11, !11}
	!10 = !DIBasicType(name: "int", size: 32, encoding: DW_ATE_signed)
	!11 = !DIBasicType(name: "long int", size: 64, encoding: DW_ATE_signed)
	!12 = !DILocalVariable(name: "bar", arg: 1, scope: !7, file: !1, line: 3, type: !11)
	!13 = !DILocation(line: 0, scope: !7)
	!14 = !DILocalVariable(name: "baz", arg: 2, scope: !7, file: !1, line: 3, type: !11)
	!15 = !DILocation(line: 4, column: 3, scope: !7)
	!16 = !DILocation(line: 5, column: 7, scope: !7)
	!17 = !DILocation(line: 6, column: 3, scope: !7)
	!18 = !DILocation(line: 8, column: 7, scope: !19)
	!19 = distinct !DILexicalBlock(scope: !7, file: !1, line: 8, column: 7)
	!20 = !DILocation(line: 8, column: 7, scope: !7)
	!21 = !DILocation(line: 9, column: 9, scope: !19)
	!22 = !DILocation(line: 9, column: 5, scope: !19)
	!23 = !DILocation(line: 11, column: 7, scope: !7)
	!24 = !DILocation(line: 12, column: 3, scope: !7)
	!25 = !DILocation(line: 13, column: 10, scope: !7)
	!26 = !DILocation(line: 13, column: 3, scope: !7)

	...
	---
	name: foo
	alignment: 16
	tracksRegLiveness: true
	liveins:
	- { reg: '$rdi' }
	- { reg: '$rsi' }
	frameInfo:
	stackSize: 24
	offsetAdjustment: -24
	maxAlignment: 1
	adjustsStack: true
	hasCalls: true
	maxCallFrameSize: 0
	cvBytesOfCalleeSavedRegisters: 16
	fixedStack:
	- { id: 0, type: spill-slot, offset: -24, size: 8, alignment: 8, callee-saved-register: '$rbx' }
	- { id: 1, type: spill-slot, offset: -16, size: 8, alignment: 16, callee-saved-register: '$r14' }
	machineFunctionInfo: {}
	body: \|
	bb.0.entry:
	liveins: $rdi, $rsi, $r14, $rbx

	frame-setup PUSH64r killed $r14, implicit-def $rsp, implicit $rsp
	CFI_INSTRUCTION def_cfa_offset 16
	frame-setup PUSH64r killed $rbx, implicit-def $rsp, implicit $rsp
	CFI_INSTRUCTION def_cfa_offset 24
	frame-setup PUSH64r undef $rax, implicit-def $rsp, implicit $rsp
	CFI_INSTRUCTION def_cfa_offset 32
	CFI_INSTRUCTION offset $rbx, -24
	CFI_INSTRUCTION offset $r14, -16
	$r14 = MOV64rr $rsi
	$rbx = MOV64rr $rdi
	CALL64pcrel32 @ext, csr_64, implicit $rsp, implicit $ssp, implicit $rdi, debug-location !15
	renamable $rbx = ADD64ri32 killed renamable $rbx, 12, implicit-def $eflags, debug-location !16
	$rdi = MOV64rr $rbx, debug-location !17
	CALL64pcrel32 @ext, csr_64, implicit $rsp, implicit $ssp, implicit $rdi, debug-location !17
	CALL64pcrel32 @getlong, csr_64, implicit $rsp, implicit $ssp, implicit-def $rax, debug-location !18
	CMP64ri8 killed renamable $rax, 0, implicit-def $eflags, debug-location !18
	JCC_1 %bb.2, 4, implicit $eflags, debug-location !20

	bb.1.if.then:
	liveins: $rbx, $r14

	renamable $rbx = ADD64ri32 killed renamable $rbx, 1, implicit-def $eflags, debug-location !21

	bb.2.if.end:
	liveins: $rbx, $r14

	DBG_PHI $rbx, 1
	$rax = COPY $rbx
	$rbx = MOV64ri 0
	DBG_INSTR_REF 1, 0, !12, !DIExpression(), debug-location !13

	; This sequence should mark the contents of rbx on block entry as being the
	; value for the variable at this DBG_INSTR_REF. We've force it to be in
	; $rax now, so we should see a DBG_VALUE for rax:
	; CHECK: DBG_PHI $rbx, 1
	; CHECK-NEXT: $rax = COPY $rbx
	; CHECK-NEXT: $rbx = MOV64ri 0
	; CHECK-NEXT: DBG_INSTR_REF 1, 0
	; CHECK-NEXT: DBG_VALUE $rax, $noreg

	$rbx = COPY $rax
	renamable $rbx = ADD64rr killed renamable $rbx, killed renamable $r14, implicit-def $eflags, debug-location !23
	DBG_VALUE $rbx, $noreg, !12, !DIExpression(), debug-location !13
	$rdi = MOV64rr $rbx, debug-location !24
	CALL64pcrel32 @ext, csr_64, implicit $rsp, implicit $ssp, implicit $rdi, debug-location !24
	$eax = MOV32rr $ebx, implicit killed $rbx, debug-location !26
	$rsp = frame-destroy ADD64ri8 $rsp, 8, implicit-def dead $eflags, debug-location !26
	CFI_INSTRUCTION def_cfa_offset 24, debug-location !26
	$rbx = frame-destroy POP64r implicit-def $rsp, implicit $rsp, debug-location !26
	CFI_INSTRUCTION def_cfa_offset 16, debug-location !26
	$r14 = frame-destroy POP64r implicit-def $rsp, implicit $rsp, debug-location !26
	CFI_INSTRUCTION def_cfa_offset 8, debug-location !26
	RET64 implicit $eax, debug-location !26

	...