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183 lines
8.8 KiB
183 lines
8.8 KiB
4 months ago
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# RUN: llc -start-before=livedebugvalues %s -filetype=asm -o -| FileCheck %s
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#
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# DbgEntityHistoryCalculator should close variable's range at the end of
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# the basic block when variable is referenced through non-changing frame
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# pointer register. Having BB1 that branches to BB2 and BB3, where
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# BB2 falls through to BB3, variable can have different locations at BB1 and BB2.
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# Since input locations at BB3 for same variable are different LiveDebugValues
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# wont generate DBG_VALUE for BB3. If last variable location at BB2 is
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# non-changing register, DbgEntityHistoryCalculator will extend range of
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# DBG_VALUE from BB2 to whole BB3 and thus produce incorrect range for
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# case when we took branch BB3 from BB1.
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#
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# Verifies that "local1" stack location is ended at the end of the block (.Ltmp6).
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#
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# CHECK: .Ltmp4:
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# CHECK-NEXT: #DEBUG_VALUE: foo:local1 <- [DW_OP_constu 4, DW_OP_minus, DW_OP_deref] $rbp
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# CHECK: jmp .LBB0_2
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# CHECK-NEXT: .Ltmp6:
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# CHECK: .Lfunc_end0:
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#
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# CHECK: .Ldebug_loc2:
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# CHECK-NEXT: .quad .Ltmp1-.Lfunc_begin0
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# CHECK-NEXT: .quad .Ltmp4-.Lfunc_begin0
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# CHECK-NEXT: .short 1 # Loc expr size
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# CHECK-NEXT: .byte 94 # super-register DW_OP_reg14
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# CHECK-NEXT: .quad .Ltmp4-.Lfunc_begin0
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# CHECK-NEXT: .quad .Ltmp6-.Lfunc_begin0
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# CHECK-NEXT: .short 2 # Loc expr size
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# CHECK-NEXT: .byte 118 # DW_OP_breg6
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# CHECK-NEXT: .byte 124 # -4
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#
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# CHECK: .long .Ldebug_loc2 # DW_AT_location
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# CHECK-NEXT: .long .Linfo_string7 # DW_AT_name
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#
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# CHECK: .Linfo_string7:
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# CHECK-NEXT: .asciz "local1"
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--- |
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; ModuleID = 'dbg-stack-value-range.ll'
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source_filename = "dbg-stack-value-range.c"
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target datalayout = "e-m:e-i64:64-f80:128-n8:16:32:64-S128"
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target triple = "x86_64-unknown-linux-gnu"
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; Function Attrs: nounwind uwtable
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define dso_local i32 @foo(i32 %X) local_unnamed_addr #0 !dbg !7 {
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entry:
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%local1 = alloca i32, align 4
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call void @llvm.dbg.value(metadata i32 %X, metadata !12, metadata !DIExpression()), !dbg !15
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%0 = bitcast i32* %local1 to i8*, !dbg !15
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call void @llvm.lifetime.start.p0i8(i64 4, i8* nonnull %0), !dbg !15
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call void @llvm.dbg.value(metadata i32 5, metadata !14, metadata !DIExpression()), !dbg !15
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%call = tail call i32 (...) @check(), !dbg !15
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%tobool = icmp eq i32 %call, 0, !dbg !15
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br i1 %tobool, label %if.else, label %if.then, !dbg !15
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if.then: ; preds = %entry
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call void @llvm.dbg.value(metadata i32 4, metadata !13, metadata !DIExpression()), !dbg !15
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store i32 4, i32* %local1, align 4, !dbg !15, !tbaa !16
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call void @llvm.dbg.value(metadata i32* %local1, metadata !13, metadata !DIExpression(DW_OP_deref)), !dbg !15
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%call1 = call i32 @init(i32* nonnull %local1), !dbg !15
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call void @llvm.dbg.value(metadata i32 undef, metadata !14, metadata !DIExpression()), !dbg !15
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br label %if.end, !dbg !15
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if.else: ; preds = %entry
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call void @llvm.dbg.value(metadata i32 5, metadata !13, metadata !DIExpression()), !dbg !15
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store i32 5, i32* %local1, align 4, !dbg !15, !tbaa !16
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br label %if.end
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if.end: ; preds = %if.else, %if.then
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%1 = bitcast i32* %local1 to i8*, !dbg !15
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call void @llvm.dbg.value(metadata i32 undef, metadata !14, metadata !DIExpression()), !dbg !15
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%call2 = call i32 (...) @init2(), !dbg !15
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call void @llvm.dbg.value(metadata i32 undef, metadata !14, metadata !DIExpression()), !dbg !15
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%2 = load i32, i32* %local1, align 4, !dbg !15, !tbaa !16
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call void @llvm.dbg.value(metadata i32 %2, metadata !13, metadata !DIExpression()), !dbg !15
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call void @llvm.lifetime.end.p0i8(i64 4, i8* nonnull %1), !dbg !15
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ret i32 %2, !dbg !15
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}
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; Function Attrs: argmemonly nounwind
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declare void @llvm.lifetime.start.p0i8(i64 immarg, i8* nocapture)
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declare dso_local i32 @check(...) local_unnamed_addr
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declare dso_local i32 @init(i32*) local_unnamed_addr
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declare dso_local i32 @init2(...) local_unnamed_addr
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; Function Attrs: argmemonly nounwind
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declare void @llvm.lifetime.end.p0i8(i64 immarg, i8* nocapture)
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; Function Attrs: nounwind readnone speculatable
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declare void @llvm.dbg.value(metadata, metadata, metadata)
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; Function Attrs: nounwind
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declare void @llvm.stackprotector(i8*, i8**)
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attributes #0 = { nounwind uwtable "frame-pointer"="non-leaf" }
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!llvm.dbg.cu = !{!0}
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!llvm.module.flags = !{!3, !4, !5}
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!llvm.ident = !{!6}
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!0 = distinct !DICompileUnit(language: DW_LANG_C99, file: !1, producer: "clang version 9.0.0", isOptimized: true, runtimeVersion: 0, emissionKind: FullDebug, enums: !2, nameTableKind: None)
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!1 = !DIFile(filename: "dbg-stack-value-range.c", directory: "/")
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!2 = !{}
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!3 = !{i32 2, !"Dwarf Version", i32 4}
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!4 = !{i32 2, !"Debug Info Version", i32 3}
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!5 = !{i32 1, !"wchar_size", i32 4}
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!6 = !{!"clang version 9.0.0"}
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!7 = distinct !DISubprogram(name: "foo", scope: !1, file: !1, line: 11, type: !8, scopeLine: 11, flags: DIFlagPrototyped, spFlags: DISPFlagDefinition | DISPFlagOptimized, unit: !0, retainedNodes: !11)
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!8 = !DISubroutineType(types: !9)
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!9 = !{!10, !10}
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!10 = !DIBasicType(name: "int", size: 32, encoding: DW_ATE_signed)
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!11 = !{!12, !13, !14}
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!12 = !DILocalVariable(name: "X", arg: 1, scope: !7, file: !1, line: 11, type: !10)
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!13 = !DILocalVariable(name: "local1", scope: !7, file: !1, line: 12, type: !10)
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!14 = !DILocalVariable(name: "local2", scope: !7, file: !1, line: 12, type: !10)
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!15 = !DILocation(line: 11, column: 13, scope: !7)
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!16 = !{!17, !17, i64 0}
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!17 = !{!"int", !18, i64 0}
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!18 = !{!"omnipotent char", !19, i64 0}
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!19 = !{!"Simple C/C++ TBAA"}
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...
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---
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name: foo
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alignment: 16
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frameInfo:
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stackSize: 24
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offsetAdjustment: -24
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maxAlignment: 4
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adjustsStack: true
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hasCalls: true
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fixedStack:
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- { id: 0, type: spill-slot, offset: -16, size: 8, alignment: 16, stack-id: default,
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callee-saved-register: '$r14d', callee-saved-restored: true, debug-info-variable: '',
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debug-info-expression: '', debug-info-location: '' }
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stack:
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- { id: 0, name: local1, type: default, offset: -20, size: 4, alignment: 4,
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stack-id: default, callee-saved-register: '', 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.entry:
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successors: %bb.3(0x30000000), %bb.1(0x50000000)
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DBG_VALUE $edi, $noreg, !12, !DIExpression(), debug-location !15
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frame-setup PUSH64r killed $rbp, implicit-def $rsp, implicit $rsp
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CFI_INSTRUCTION def_cfa_offset 16
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CFI_INSTRUCTION offset $rbp, -16
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$rbp = frame-setup MOV64rr $rsp
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CFI_INSTRUCTION def_cfa_register $rbp
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$rsp = frame-setup SUB64ri8 $rsp, 16, implicit-def dead $eflags
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DBG_VALUE 5, $noreg, !14, !DIExpression(), debug-location !15
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$r14d = MOV32ri 4, implicit-def $r14
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DBG_VALUE $r14d, $noreg, !13, !DIExpression(), debug-location !15
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dead $eax = XOR32rr undef $eax, undef $eax, implicit-def dead $eflags, implicit-def $al, debug-location !15
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CALL64pcrel32 @check, csr_64, implicit $rsp, implicit $ssp, implicit $al, implicit-def $rsp, implicit-def $ssp, implicit-def $eax, debug-location !15
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TEST32rr killed renamable $eax, renamable $eax, implicit-def $eflags, debug-location !15
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JCC_1 %bb.3, 4, implicit killed $eflags, debug-location !15
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bb.1.if.then:
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successors: %bb.3(0x80000000)
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MOV32mr $rbp, 1, $noreg, -4, $noreg, $r14d, debug-location !15 :: (store 4 into %ir.local1, !tbaa !16)
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DBG_VALUE $rbp, $noreg, !13, !DIExpression(DW_OP_constu, 4, DW_OP_minus, DW_OP_deref), debug-location !15
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renamable $rdi = LEA64r $rbp, 1, $noreg, -4, $noreg
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CALL64pcrel32 @init, csr_64, implicit $rsp, implicit $ssp, implicit $rdi, implicit-def $rsp, implicit-def $ssp, implicit-def dead $eax, debug-location !15
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DBG_VALUE $noreg, $noreg, !14, !DIExpression(), debug-location !15
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JMP_1 %bb.3
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bb.3.if.end:
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DBG_VALUE $noreg, $noreg, !14, !DIExpression(), debug-location !15
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dead $eax = XOR32rr undef $eax, undef $eax, implicit-def dead $eflags, implicit-def $al, debug-location !15
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CALL64pcrel32 @init2, csr_64, implicit $rsp, implicit $ssp, implicit $al, implicit-def $rsp, implicit-def $ssp, implicit-def dead $eax, debug-location !15
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DBG_VALUE $noreg, $noreg, !14, !DIExpression(), debug-location !15
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renamable $eax = MOV32rm $rbp, 1, $noreg, -4, $noreg, debug-location !15 :: (dereferenceable load 4 from %ir.local1, !tbaa !16)
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$rsp = frame-destroy ADD64ri8 $rsp, 16, implicit-def dead $eflags, debug-location !15
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$rbp = frame-destroy POP64r implicit-def $rsp, implicit $rsp, debug-location !15
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CFI_INSTRUCTION def_cfa $rsp, 8, debug-location !15
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RETQ $eax, debug-location !15
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...
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