maxjhandsome
/
llvm-project
forked from OSchip/llvm-project
1
0
Fork 0
Code Issues Pull Requests Packages Releases Wiki Activity
llvm-project/llvm/test/DebugInfo/X86/global-sra-fp80-array.ll

Ignoring revisions in .git-blame-ignore-revs. Click here to bypass and see the normal blame view.

130 lines
5.9 KiB
LLVM
Raw Normal View History

[GlobalOpt] Include padding in debug fragments Summary: When creating the debug fragments for a SRA'd variable, use the types' allocation sizes. This fixes issues where the pass would emit too small fragments, placed at the wrong offset, for padded types. An example of this is long double on x86. The type is represented using x86_fp80, which is 10 bytes, but the value is aligned to 12/16 bytes. The padding is included in the type's DW_AT_byte_size attribute; therefore, the fragments should also include that. Newer GCC releases (I tested 7.2.0) emit 12/16-byte pieces for long double. Earlier releases, e.g. GCC 5.5.0, behaved as LLVM did, i.e. by emitting a 10-byte piece, followed by an empty 2/6-byte piece for the padding. Failing to cover all `DW_AT_byte_size' bytes of a value with non-empty pieces results in the value being printed as <optimized out> by GDB. Patch by: David Stenberg Reviewers: aprantl, JDevlieghere Reviewed By: aprantl, JDevlieghere Subscribers: llvm-commits Tags: #debug-info Differential Revision: https://reviews.llvm.org/D42807 llvm-svn: 324066
2018-02-02 18:34:13 +08:00
; RUN: opt -S -globalopt < %s | FileCheck %s
source_filename = "array.c"
target datalayout = "e-m:e-i64:64-f80:128-n8:16:32:64-S128"
target triple = "x86_64-unknown-linux-gnu"
%struct.mystruct = type { i32, i64 }
; Generated from:
;
; static long double array[2];
; void __attribute__((nodebug)) foo(int in) { array[0] = in; }
; void __attribute__((nodebug)) bar(int in) { array[1] = in; }
; int main(int argc, char **argv)
; {
; foo(argv[0][1]);
; bar(argv[0][1]);
; return (array[0] + array[1]) > 0;
; }
;
; using clang -O0 -g2 -S -emit-llvm
@array = internal global [2 x x86_fp80] zeroinitializer, align 16, !dbg !0
; CHECK: @array.0 = internal unnamed_addr global x86_fp80 0xK00000000000000000000, align 16, !dbg ![[EL0:.*]]
; CHECK: @array.1 = internal unnamed_addr global x86_fp80 0xK00000000000000000000, align 16, !dbg ![[EL1:.*]]
;
; CHECK: ![[EL0]] = !DIGlobalVariableExpression(var: ![[VAR:.*]], expr: !DIExpression(DW_OP_LLVM_fragment, 0, 128))
; CHECK: ![[VAR]] = distinct !DIGlobalVariable(name: "array"
; CHECK: ![[EL1]] = !DIGlobalVariableExpression(var: ![[VAR]], expr: !DIExpression(DW_OP_LLVM_fragment, 128, 128))
; Function Attrs: noinline nounwind optnone uwtable
define void @foo(i32 %in) #0 {
entry:
%in.addr = alloca i32, align 4
store i32 %in, i32* %in.addr, align 4
%0 = load i32, i32* %in.addr, align 4
%conv = sitofp i32 %0 to x86_fp80
store x86_fp80 %conv, x86_fp80* getelementptr inbounds ([2 x x86_fp80], [2 x x86_fp80]* @array, i64 0, i64 0), align 16
ret void
}
; Function Attrs: noinline nounwind optnone uwtable
define void @bar(i32 %in) #0 {
entry:
%in.addr = alloca i32, align 4
store i32 %in, i32* %in.addr, align 4
%0 = load i32, i32* %in.addr, align 4
%conv = sitofp i32 %0 to x86_fp80
store x86_fp80 %conv, x86_fp80* getelementptr inbounds ([2 x x86_fp80], [2 x x86_fp80]* @array, i64 0, i64 1), align 16
ret void
}
; Function Attrs: noinline nounwind optnone uwtable
define i32 @main(i32 %argc, i8** %argv) #0 !dbg !14 {
entry:
%retval = alloca i32, align 4
%argc.addr = alloca i32, align 4
%argv.addr = alloca i8**, align 8
store i32 0, i32* %retval, align 4
store i32 %argc, i32* %argc.addr, align 4
call void @llvm.dbg.declare(metadata i32* %argc.addr, metadata !21, metadata !DIExpression()), !dbg !22
store i8** %argv, i8*** %argv.addr, align 8
call void @llvm.dbg.declare(metadata i8*** %argv.addr, metadata !23, metadata !DIExpression()), !dbg !24
%0 = load i8**, i8*** %argv.addr, align 8, !dbg !25
%arrayidx = getelementptr inbounds i8*, i8** %0, i64 0, !dbg !25
%1 = load i8*, i8** %arrayidx, align 8, !dbg !25
%arrayidx1 = getelementptr inbounds i8, i8* %1, i64 1, !dbg !25
%2 = load i8, i8* %arrayidx1, align 1, !dbg !25
%conv = sext i8 %2 to i32, !dbg !25
call void @foo(i32 %conv), !dbg !26
%3 = load i8**, i8*** %argv.addr, align 8, !dbg !27
%arrayidx2 = getelementptr inbounds i8*, i8** %3, i64 0, !dbg !27
%4 = load i8*, i8** %arrayidx2, align 8, !dbg !27
%arrayidx3 = getelementptr inbounds i8, i8* %4, i64 1, !dbg !27
%5 = load i8, i8* %arrayidx3, align 1, !dbg !27
%conv4 = sext i8 %5 to i32, !dbg !27
call void @bar(i32 %conv4), !dbg !28
%6 = load x86_fp80, x86_fp80* getelementptr inbounds ([2 x x86_fp80], [2 x x86_fp80]* @array, i64 0, i64 0), align 16, !dbg !29
%7 = load x86_fp80, x86_fp80* getelementptr inbounds ([2 x x86_fp80], [2 x x86_fp80]* @array, i64 0, i64 1), align 16, !dbg !30
%add = fadd x86_fp80 %6, %7, !dbg !31
%cmp = fcmp ogt x86_fp80 %add, 0xK00000000000000000000, !dbg !32
%conv5 = zext i1 %cmp to i32, !dbg !32
ret i32 %conv5, !dbg !33
}
; Function Attrs: nounwind readnone speculatable
declare void @llvm.dbg.declare(metadata, metadata, metadata) #1
attributes #0 = { noinline nounwind optnone uwtable }
attributes #1 = { nounwind readnone speculatable }
!llvm.dbg.cu = !{!2}
!llvm.module.flags = !{!10, !11, !12}
!llvm.ident = !{!13}
!0 = !DIGlobalVariableExpression(var: !1, expr: !DIExpression())
!1 = distinct !DIGlobalVariable(name: "array", scope: !2, file: !3, line: 1, type: !6, isLocal: true, isDefinition: true)
!2 = distinct !DICompileUnit(language: DW_LANG_C99, file: !3, producer: "clang version 7.0.0", isOptimized: false, runtimeVersion: 0, emissionKind: FullDebug, enums: !4, globals: !5)
!3 = !DIFile(filename: "array.c", directory: "/")
!4 = !{}
!5 = !{!0}
!6 = !DICompositeType(tag: DW_TAG_array_type, baseType: !7, size: 256, elements: !8)
!7 = !DIBasicType(name: "long double", size: 128, encoding: DW_ATE_float)
!8 = !{!9}
!9 = !DISubrange(count: 2)
!10 = !{i32 2, !"Dwarf Version", i32 4}
!11 = !{i32 2, !"Debug Info Version", i32 3}
!12 = !{i32 1, !"wchar_size", i32 4}
!13 = !{!"clang version 7.0.0"}
[DebugInfo] Add DILabel metadata and intrinsic llvm.dbg.label. In order to set breakpoints on labels and list source code around labels, we need collect debug information for labels, i.e., label name, the function label belong, line number in the file, and the address label located. In order to keep these information in LLVM IR and to allow backend to generate debug information correctly. We create a new kind of metadata for labels, DILabel. The format of DILabel is !DILabel(scope: !1, name: "foo", file: !2, line: 3) We hope to keep debug information as much as possible even the code is optimized. So, we create a new kind of intrinsic for label metadata to avoid the metadata is eliminated with basic block. The intrinsic will keep existing if we keep it from optimized out. The format of the intrinsic is llvm.dbg.label(metadata !1) It has only one argument, that is the DILabel metadata. The intrinsic will follow the label immediately. Backend could get the label metadata through the intrinsic's parameter. We also create DIBuilder API for labels to be used by Frontend. Frontend could use createLabel() to allocate DILabel objects, and use insertLabel() to insert llvm.dbg.label intrinsic in LLVM IR. Differential Revision: https://reviews.llvm.org/D45024 Patch by Hsiangkai Wang. llvm-svn: 331841
2018-05-09 10:40:45 +08:00
!14 = distinct !DISubprogram(name: "main", scope: !3, file: !3, line: 4, type: !15, isLocal: false, isDefinition: true, scopeLine: 5, flags: DIFlagPrototyped, isOptimized: false, unit: !2, retainedNodes: !4)
[GlobalOpt] Include padding in debug fragments Summary: When creating the debug fragments for a SRA'd variable, use the types' allocation sizes. This fixes issues where the pass would emit too small fragments, placed at the wrong offset, for padded types. An example of this is long double on x86. The type is represented using x86_fp80, which is 10 bytes, but the value is aligned to 12/16 bytes. The padding is included in the type's DW_AT_byte_size attribute; therefore, the fragments should also include that. Newer GCC releases (I tested 7.2.0) emit 12/16-byte pieces for long double. Earlier releases, e.g. GCC 5.5.0, behaved as LLVM did, i.e. by emitting a 10-byte piece, followed by an empty 2/6-byte piece for the padding. Failing to cover all `DW_AT_byte_size' bytes of a value with non-empty pieces results in the value being printed as <optimized out> by GDB. Patch by: David Stenberg Reviewers: aprantl, JDevlieghere Reviewed By: aprantl, JDevlieghere Subscribers: llvm-commits Tags: #debug-info Differential Revision: https://reviews.llvm.org/D42807 llvm-svn: 324066
2018-02-02 18:34:13 +08:00
!15 = !DISubroutineType(types: !16)
!16 = !{!17, !17, !18}
!17 = !DIBasicType(name: "int", size: 32, encoding: DW_ATE_signed)
!18 = !DIDerivedType(tag: DW_TAG_pointer_type, baseType: !19, size: 64)
!19 = !DIDerivedType(tag: DW_TAG_pointer_type, baseType: !20, size: 64)
!20 = !DIBasicType(name: "char", size: 8, encoding: DW_ATE_signed_char)
!21 = !DILocalVariable(name: "argc", arg: 1, scope: !14, file: !3, line: 4, type: !17)
!22 = !DILocation(line: 4, column: 14, scope: !14)
!23 = !DILocalVariable(name: "argv", arg: 2, scope: !14, file: !3, line: 4, type: !18)
!24 = !DILocation(line: 4, column: 27, scope: !14)
!25 = !DILocation(line: 6, column: 7, scope: !14)
!26 = !DILocation(line: 6, column: 3, scope: !14)
!27 = !DILocation(line: 7, column: 7, scope: !14)
!28 = !DILocation(line: 7, column: 3, scope: !14)
!29 = !DILocation(line: 8, column: 11, scope: !14)
!30 = !DILocation(line: 8, column: 22, scope: !14)
!31 = !DILocation(line: 8, column: 20, scope: !14)
!32 = !DILocation(line: 8, column: 32, scope: !14)
!33 = !DILocation(line: 8, column: 3, scope: !14)