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llvm-mirror/test/DebugInfo/Mips/dsr-non-fixed-objects.ll
Shiva Chen a2029fa58e [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 02:40:45 +00:00

123 lines
5.4 KiB
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; RUN: llc -march=mips -mcpu=mips32r2 -O0 -filetype=obj -fast-isel=0 <%s | \
; RUN: llvm-dwarfdump -v -all - | FileCheck %s
declare void @llvm.dbg.declare(metadata, metadata, metadata)
declare void @foo(i32*)
; void foo(int *);
;
; int f2(int a, int b) {
; int c __attribute__((aligned(16))) = a + b;
; foo(&c);
; return c;
; }
;
; int *f3(int a, int b) {
; int c __attribute__((aligned(16))) = a + b;
; int *w = alloca(c);
; foo(&c);
; return w;
; }
; CHECK: DW_TAG_subprogram
; CHECK: DW_AT_location [DW_FORM_exprloc] (DW_OP_breg29 SP_64+36)
; CHECK: DW_AT_name [DW_FORM_strp] ( .debug_str[0x00000065] = "c")
; Function Attrs: nounwind
define i32 @f2(i32 signext %a, i32 signext %b) !dbg !4 {
entry:
%a.addr = alloca i32, align 4
%b.addr = alloca i32, align 4
%c = alloca i32, align 16
store i32 %a, i32* %a.addr, align 4
call void @llvm.dbg.declare(metadata i32* %a.addr, metadata !15, metadata !16), !dbg !17
store i32 %b, i32* %b.addr, align 4
call void @llvm.dbg.declare(metadata i32* %b.addr, metadata !18, metadata !16), !dbg !19
call void @llvm.dbg.declare(metadata i32* %c, metadata !20, metadata !16), !dbg !21
%0 = load i32, i32* %a.addr, align 4, !dbg !22
%1 = load i32, i32* %b.addr, align 4, !dbg !23
%add = add nsw i32 %0, %1, !dbg !24
store i32 %add, i32* %c, align 16, !dbg !21
call void @foo(i32* %c), !dbg !25
%2 = load i32, i32* %c, align 16, !dbg !26
ret i32 %2, !dbg !27
}
; CHECK: DW_TAG_subprogram
; CHECK: DW_AT_location [DW_FORM_exprloc] (DW_OP_breg23 S7_64+32)
; CHECK: DW_AT_name [DW_FORM_strp] ( .debug_str[0x00000065] = "c")
define i32* @f3(i32 signext %a, i32 signext %b) !dbg !8 {
entry:
%a.addr = alloca i32, align 4
%b.addr = alloca i32, align 4
%c = alloca i32, align 16
%w = alloca i32*, align 4
store i32 %a, i32* %a.addr, align 4
call void @llvm.dbg.declare(metadata i32* %a.addr, metadata !28, metadata !16), !dbg !29
store i32 %b, i32* %b.addr, align 4
call void @llvm.dbg.declare(metadata i32* %b.addr, metadata !30, metadata !16), !dbg !31
call void @llvm.dbg.declare(metadata i32* %c, metadata !32, metadata !16), !dbg !33
%0 = load i32, i32* %a.addr, align 4, !dbg !34
%1 = load i32, i32* %b.addr, align 4, !dbg !35
%add = add nsw i32 %0, %1, !dbg !36
store i32 %add, i32* %c, align 16, !dbg !33
call void @llvm.dbg.declare(metadata i32** %w, metadata !37, metadata !DIExpression(DW_OP_deref)), !dbg !38
%2 = load i32, i32* %c, align 16, !dbg !39
%3 = alloca i8, i32 %2, !dbg !40
%4 = bitcast i8* %3 to i32*, !dbg !40
store i32* %4, i32** %w, align 4, !dbg !38
call void @foo(i32* %c), !dbg !41
%5 = load i32*, i32** %w, align 4, !dbg !42
ret i32* %5, !dbg !43
}
!llvm.dbg.cu = !{!0}
!llvm.module.flags = !{!12, !13}
!llvm.ident = !{!14}
!0 = distinct !DICompileUnit(language: DW_LANG_C99, file: !1, producer: "clang version 3.8.0 (trunk 251783) (llvm/trunk 251781)", isOptimized: false, runtimeVersion: 0, emissionKind: FullDebug, enums: !2)
!1 = !DIFile(filename: "test.c", directory: "/home/vk/repos/tmp/dwarf")
!2 = !{}
!4 = distinct !DISubprogram(name: "f2", scope: !1, file: !1, line: 20, type: !5, isLocal: false, isDefinition: true, scopeLine: 20, flags: DIFlagPrototyped, isOptimized: false, unit: !0, retainedNodes: !2)
!5 = !DISubroutineType(types: !6)
!6 = !{!7, !7, !7}
!7 = !DIBasicType(name: "int", size: 32, align: 32, encoding: DW_ATE_signed)
!8 = distinct !DISubprogram(name: "f3", scope: !1, file: !1, line: 27, type: !9, isLocal: false, isDefinition: true, scopeLine: 27, flags: DIFlagPrototyped, isOptimized: false, unit: !0, retainedNodes: !2)
!9 = !DISubroutineType(types: !10)
!10 = !{!11, !7, !7}
!11 = !DIDerivedType(tag: DW_TAG_pointer_type, baseType: !7, size: 32, align: 32)
!12 = !{i32 2, !"Dwarf Version", i32 4}
!13 = !{i32 2, !"Debug Info Version", i32 3}
!14 = !{!"clang version 3.8.0 (trunk 251783) (llvm/trunk 251781)"}
!15 = !DILocalVariable(name: "a", arg: 1, scope: !4, file: !1, line: 20, type: !7)
!16 = !DIExpression()
!17 = !DILocation(line: 20, column: 12, scope: !4)
!18 = !DILocalVariable(name: "b", arg: 2, scope: !4, file: !1, line: 20, type: !7)
!19 = !DILocation(line: 20, column: 19, scope: !4)
!20 = !DILocalVariable(name: "c", scope: !4, file: !1, line: 21, type: !7)
!21 = !DILocation(line: 21, column: 7, scope: !4)
!22 = !DILocation(line: 21, column: 40, scope: !4)
!23 = !DILocation(line: 21, column: 44, scope: !4)
!24 = !DILocation(line: 21, column: 42, scope: !4)
!25 = !DILocation(line: 22, column: 3, scope: !4)
!26 = !DILocation(line: 23, column: 10, scope: !4)
!27 = !DILocation(line: 23, column: 3, scope: !4)
!28 = !DILocalVariable(name: "a", arg: 1, scope: !8, file: !1, line: 27, type: !7)
!29 = !DILocation(line: 27, column: 13, scope: !8)
!30 = !DILocalVariable(name: "b", arg: 2, scope: !8, file: !1, line: 27, type: !7)
!31 = !DILocation(line: 27, column: 20, scope: !8)
!32 = !DILocalVariable(name: "c", scope: !8, file: !1, line: 28, type: !7)
!33 = !DILocation(line: 28, column: 7, scope: !8)
!34 = !DILocation(line: 28, column: 40, scope: !8)
!35 = !DILocation(line: 28, column: 44, scope: !8)
!36 = !DILocation(line: 28, column: 42, scope: !8)
!37 = !DILocalVariable(name: "w", scope: !8, file: !1, line: 29, type: !11)
!38 = !DILocation(line: 29, column: 8, scope: !8)
!39 = !DILocation(line: 29, column: 19, scope: !8)
!40 = !DILocation(line: 29, column: 12, scope: !8)
!41 = !DILocation(line: 30, column: 3, scope: !8)
!42 = !DILocation(line: 31, column: 10, scope: !8)
!43 = !DILocation(line: 31, column: 3, scope: !8)
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