| # RUN: llc -O1 -start-after=livedebugvalues -o - %s | FileCheck %s |
| |
| # Reproducer based on the following C file: |
| # |
| # int global1, global2, global3; |
| # |
| # extern void ext1(int); |
| # extern void ext2(int, int); |
| # extern void ext3(int, int, int); |
| # |
| # int test1() { |
| # int local[3] = {global1, 123, 456}; |
| # ext2(local[0], local[1]); |
| # return local[1]; |
| # } |
| # |
| # int test2() { |
| # int local[3] = {global1, global2, global3}; |
| # ext3(local[0], local[1], local[2]); |
| # return local[0]; |
| # } |
| # |
| # Compiled using -O1 -g. |
| |
| --- | |
| target datalayout = "e-m:e-i64:64-f80:128-n8:16:32:64-S128" |
| target triple = "x86_64-unknown-linux-gnu" |
| |
| @global1 = common global i32 0, align 4 |
| @global2 = common global i32 0, align 4 |
| @global3 = common global i32 0, align 4 |
| |
| ; Function Attrs: nounwind uwtable |
| define i32 @test1() #0 !dbg !8 { |
| entry: |
| %0 = load i32, i32* @global1, align 4, !dbg !16 |
| call void @llvm.dbg.value(metadata i32 %0, metadata !12, metadata !DIExpression(DW_OP_LLVM_fragment, 0, 32)), !dbg !16 |
| call void @llvm.dbg.value(metadata i32 123, metadata !12, metadata !DIExpression(DW_OP_LLVM_fragment, 32, 32)), !dbg !16 |
| call void @llvm.dbg.value(metadata i32 456, metadata !12, metadata !DIExpression(DW_OP_LLVM_fragment, 64, 32)), !dbg !16 |
| tail call void @ext2(i32 %0, i32 123), !dbg !16 |
| ret i32 123, !dbg !17 |
| } |
| |
| declare void @ext2(i32, i32) |
| |
| ; Function Attrs: nounwind uwtable |
| define i32 @test2() #0 !dbg !18 { |
| entry: |
| %0 = load i32, i32* @global1, align 4, !dbg !20 |
| call void @llvm.dbg.value(metadata i32 %0, metadata !19, metadata !DIExpression(DW_OP_LLVM_fragment, 0, 32)), !dbg !20 |
| %1 = load i32, i32* @global2, align 4, !dbg !20 |
| call void @llvm.dbg.value(metadata i32 %1, metadata !19, metadata !DIExpression(DW_OP_LLVM_fragment, 32, 32)), !dbg !20 |
| %2 = load i32, i32* @global3, align 4, !dbg !20 |
| call void @llvm.dbg.value(metadata i32 %2, metadata !19, metadata !DIExpression(DW_OP_LLVM_fragment, 64, 32)), !dbg !20 |
| tail call void @ext3(i32 %0, i32 %1, i32 %2) #3, !dbg !20 |
| ret i32 %0, !dbg !21 |
| } |
| |
| declare void @ext3(i32, i32, i32) |
| |
| ; Function Attrs: nounwind readnone speculatable |
| declare void @llvm.dbg.value(metadata, metadata, metadata) #1 |
| |
| attributes #0 = { nounwind uwtable } |
| attributes #1 = { nounwind readnone speculatable } |
| |
| !llvm.dbg.cu = !{!1} |
| !llvm.module.flags = !{!5, !6} |
| !llvm.ident = !{!7} |
| |
| !1 = distinct !DICompileUnit(language: DW_LANG_C99, file: !2, producer: "clang version 9.0.0", isOptimized: true, runtimeVersion: 0, emissionKind: FullDebug, enums: !3, globals: !3, nameTableKind: None) |
| !2 = !DIFile(filename: "foo.c", directory: "/") |
| !3 = !{} |
| !4 = !DIBasicType(name: "int", size: 32, encoding: DW_ATE_signed) |
| !5 = !{i32 2, !"Dwarf Version", i32 4} |
| !6 = !{i32 2, !"Debug Info Version", i32 3} |
| !7 = !{!"clang version 9.0.0"} |
| !8 = distinct !DISubprogram(name: "test1", scope: !2, file: !2, line: 7, type: !9, scopeLine: 7, spFlags: DISPFlagDefinition | DISPFlagOptimized, unit: !1, retainedNodes: !11) |
| !9 = !DISubroutineType(types: !10) |
| !10 = !{!4} |
| !11 = !{!12} |
| !12 = !DILocalVariable(name: "local", scope: !8, file: !2, line: 8, type: !13) |
| !13 = !DICompositeType(tag: DW_TAG_array_type, baseType: !4, size: 96, elements: !14) |
| !14 = !{!15} |
| !15 = !DISubrange(count: 3) |
| !16 = !DILocation(line: 8, scope: !8) |
| !17 = !DILocation(line: 9, scope: !8) |
| !18 = distinct !DISubprogram(name: "test2", scope: !2, file: !2, line: 7, type: !9, scopeLine: 7, spFlags: DISPFlagDefinition | DISPFlagOptimized, unit: !1, retainedNodes: !11) |
| !19 = !DILocalVariable(name: "local", scope: !18, file: !2, line: 8, type: !13) |
| !20 = !DILocation(line: 15, scope: !18) |
| !21 = !DILocation(line: 16, scope: !18) |
| |
| ... |
| --- |
| name: test1 |
| tracksRegLiveness: true |
| body: | |
| bb.0.entry: |
| frame-setup PUSH64r undef $rax, implicit-def $rsp, implicit $rsp |
| renamable $edi = MOV32rm $rip, 1, $noreg, @global1, $noreg, debug-location !16 :: (dereferenceable load 4 from @global1) |
| DBG_VALUE 456, $noreg, !12, !DIExpression(DW_OP_LLVM_fragment, 64, 32), debug-location !16 |
| DBG_VALUE 123, $noreg, !12, !DIExpression(DW_OP_LLVM_fragment, 32, 32), debug-location !16 |
| DBG_VALUE $edi, $noreg, !12, !DIExpression(DW_OP_LLVM_fragment, 0, 32), debug-location !16 |
| $esi = MOV32ri 123, debug-location !16 |
| CALL64pcrel32 @ext2, csr_64, implicit $rsp, implicit $ssp, implicit $edi, implicit killed $esi, implicit-def $rsp, implicit-def $ssp, debug-location !16 |
| $eax = MOV32ri 123, debug-location !17 |
| $rcx = frame-destroy POP64r implicit-def $rsp, implicit $rsp, debug-location !17 |
| RETQ killed $eax, debug-location !17 |
| |
| ... |
| |
| # CHECK: .Ltmp1 |
| # CHECK-NEXT: #DEBUG_VALUE: test1:local <- [DW_OP_LLVM_fragment 64 32] 456 |
| # CHECK-NEXT: #DEBUG_VALUE: test1:local <- [DW_OP_LLVM_fragment 32 32] 123 |
| # CHECK-NEXT: #DEBUG_VALUE: test1:local <- [DW_OP_LLVM_fragment 0 32] $edi |
| # CHECK: callq ext2 |
| # CHECK-NEXT: .Ltmp2: |
| |
| ... |
| --- |
| name: test2 |
| tracksRegLiveness: true |
| body: | |
| bb.0.entry: |
| liveins: $rbx |
| |
| frame-setup PUSH64r killed $rbx, implicit-def $rsp, implicit $rsp, debug-location !20 |
| renamable $ebx = MOV32rm $rip, 1, $noreg, @global1, $noreg, debug-location !20 :: (dereferenceable load 4 from @global1) |
| DBG_VALUE $ebx, $noreg, !19, !DIExpression(DW_OP_LLVM_fragment, 0, 32), debug-location !20 |
| renamable $esi = MOV32rm $rip, 1, $noreg, @global2, $noreg, debug-location !20 :: (dereferenceable load 4 from @global2) |
| DBG_VALUE $esi, $noreg, !19, !DIExpression(DW_OP_LLVM_fragment, 32, 32), debug-location !20 |
| renamable $edx = MOV32rm $rip, 1, $noreg, @global3, $noreg, debug-location !20 :: (dereferenceable load 4 from @global3) |
| DBG_VALUE $edx, $noreg, !19, !DIExpression(DW_OP_LLVM_fragment, 64, 32), debug-location !20 |
| $edi = MOV32rr $ebx, debug-location !20 |
| CALL64pcrel32 @ext3, csr_64, implicit $rsp, implicit $ssp, implicit killed $edi, implicit $esi, implicit $edx, implicit-def $rsp, implicit-def $ssp, debug-location !20 |
| $eax = MOV32rr killed $ebx, debug-location !20 |
| $rbx = frame-destroy POP64r implicit-def $rsp, implicit $rsp, debug-location !20 |
| RETQ killed $eax, debug-location !21 |
| |
| ... |
| |
| # CHECK: .Ltmp4: |
| # CHECK-NEXT: #DEBUG_VALUE: test2:local <- [DW_OP_LLVM_fragment 0 32] $ebx |
| # CHECK: .Ltmp5: |
| # CHECK-NEXT: #DEBUG_VALUE: test2:local <- [DW_OP_LLVM_fragment 32 32] $esi |
| # CHECK: .Ltmp6: |
| # CHECK-NEXT: #DEBUG_VALUE: test2:local <- [DW_OP_LLVM_fragment 64 32] $edx |
| # CHECK: callq ext3 |
| # CHECK-NEXT: .Ltmp7: |
| # CHECK: popq %rbx |
| # CHECK-NEXT: .Ltmp8: |
| |
| #### Location list for test1:local. |
| |
| # Verify that a location list entry, which does not contain the fragment that |
| # is described by the clobbered $edi, is emitted directly after the call to |
| # ext2(). |
| |
| # CHECK: .Ldebug_loc0: |
| # CHECK-NEXT: .quad .Ltmp1-.Lfunc_begin0 |
| # CHECK-NEXT: .quad .Ltmp2-.Lfunc_begin0 |
| # CHECK-NEXT: .short 14 # Loc expr size |
| # CHECK-NEXT: .byte 85 # super-register DW_OP_reg5 |
| # CHECK-NEXT: .byte 147 # DW_OP_piece |
| # CHECK-NEXT: .byte 4 # 4 |
| # CHECK-NEXT: .byte 16 # DW_OP_constu |
| # CHECK-NEXT: .byte 123 # 123 |
| # CHECK-NEXT: .byte 159 # DW_OP_stack_value |
| # CHECK-NEXT: .byte 147 # DW_OP_piece |
| # CHECK-NEXT: .byte 4 # 4 |
| # CHECK-NEXT: .byte 16 # DW_OP_constu |
| # CHECK-NEXT: .byte 200 # 456 |
| # CHECK-NEXT: .byte 3 # |
| # CHECK-NEXT: .byte 159 # DW_OP_stack_value |
| # CHECK-NEXT: .byte 147 # DW_OP_piece |
| # CHECK-NEXT: .byte 4 # 4 |
| # CHECK-NEXT: .quad .Ltmp2-.Lfunc_begin0 |
| # CHECK-NEXT: .quad .Lfunc_end0-.Lfunc_begin0 |
| # CHECK-NEXT: .short 13 # Loc expr size |
| # CHECK-NEXT: .byte 147 # DW_OP_piece |
| # CHECK-NEXT: .byte 4 # 4 |
| # CHECK-NEXT: .byte 16 # DW_OP_constu |
| # CHECK-NEXT: .byte 123 # 123 |
| # CHECK-NEXT: .byte 159 # DW_OP_stack_value |
| # CHECK-NEXT: .byte 147 # DW_OP_piece |
| # CHECK-NEXT: .byte 4 # 4 |
| # CHECK-NEXT: .byte 16 # DW_OP_constu |
| # CHECK-NEXT: .byte 200 # 456 |
| # CHECK-NEXT: .byte 3 # |
| # CHECK-NEXT: .byte 159 # DW_OP_stack_value |
| # CHECK-NEXT: .byte 147 # DW_OP_piece |
| # CHECK-NEXT: .byte 4 # 4 |
| # CHECK-NEXT: .quad 0 |
| # CHECK-NEXT: .quad 0 |
| |
| #### Location list for test2:local. |
| |
| # Verify that the debug values that are described by $edi and $edx are |
| # considered clobbered by the call to ext3(), leaving a location list entry |
| # after the call where the first 32 bits are still described by $ebx. |
| # That location list entry is valid until the restore of the register. |
| |
| # CHECK: .Ldebug_loc1: |
| # CHECK-NEXT: .quad .Ltmp4-.Lfunc_begin0 |
| # CHECK-NEXT: .quad .Ltmp5-.Lfunc_begin0 |
| # CHECK-NEXT: .short 3 # Loc expr size |
| # CHECK-NEXT: .byte 83 # super-register DW_OP_reg3 |
| # CHECK-NEXT: .byte 147 # DW_OP_piece |
| # CHECK-NEXT: .byte 4 # 4 |
| # CHECK-NEXT: .quad .Ltmp5-.Lfunc_begin0 |
| # CHECK-NEXT: .quad .Ltmp6-.Lfunc_begin0 |
| # CHECK-NEXT: .short 6 # Loc expr size |
| # CHECK-NEXT: .byte 83 # super-register DW_OP_reg3 |
| # CHECK-NEXT: .byte 147 # DW_OP_piece |
| # CHECK-NEXT: .byte 4 # 4 |
| # CHECK-NEXT: .byte 84 # super-register DW_OP_reg4 |
| # CHECK-NEXT: .byte 147 # DW_OP_piece |
| # CHECK-NEXT: .byte 4 # 4 |
| # CHECK-NEXT: .quad .Ltmp6-.Lfunc_begin0 |
| # CHECK-NEXT: .quad .Ltmp7-.Lfunc_begin0 |
| # CHECK-NEXT: .short 9 # Loc expr size |
| # CHECK-NEXT: .byte 83 # super-register DW_OP_reg3 |
| # CHECK-NEXT: .byte 147 # DW_OP_piece |
| # CHECK-NEXT: .byte 4 # 4 |
| # CHECK-NEXT: .byte 84 # super-register DW_OP_reg4 |
| # CHECK-NEXT: .byte 147 # DW_OP_piece |
| # CHECK-NEXT: .byte 4 # 4 |
| # CHECK-NEXT: .byte 81 # super-register DW_OP_reg1 |
| # CHECK-NEXT: .byte 147 # DW_OP_piece |
| # CHECK-NEXT: .byte 4 # 4 |
| # CHECK-NEXT: .quad .Ltmp7-.Lfunc_begin0 |
| # CHECK-NEXT: .quad .Ltmp8-.Lfunc_begin0 |
| # CHECK-NEXT: .short 3 # Loc expr size |
| # CHECK-NEXT: .byte 83 # super-register DW_OP_reg3 |
| # CHECK-NEXT: .byte 147 # DW_OP_piece |
| # CHECK-NEXT: .byte 4 # 4 |
| # CHECK-NEXT: .quad 0 |
| # CHECK-NEXT: .quad 0 |
