2c864551df
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
140 lines
5.6 KiB
LLVM
140 lines
5.6 KiB
LLVM
; RUN: llc -mtriple arm-unknown-linux-gnueabi -filetype asm -o - %s | FileCheck %s --check-prefix=CHECK-FP
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; RUN: llc -mtriple arm-unknown-linux-gnueabi -filetype asm -o - %s -disable-fp-elim | FileCheck %s --check-prefix=CHECK-FP-ELIM
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; RUN: llc -mtriple thumb-unknown-linux-gnueabi -filetype asm -o - %s | FileCheck %s --check-prefix=CHECK-THUMB-FP
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; RUN: llc -mtriple thumb-unknown-linux-gnueabi -filetype asm -o - %s -disable-fp-elim | FileCheck %s --check-prefix=CHECK-THUMB-FP-ELIM
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; Tests that the initial space allocated to the varargs on the stack is
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; taken into account in the .cfi_ directives.
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; Generated from the C program:
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; #include <stdarg.h>
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;
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; extern int foo(int);
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;
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; int sum(int count, ...) {
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; va_list vl;
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; va_start(vl, count);
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; int sum = 0;
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; for (int i = 0; i < count; i++) {
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; sum += foo(va_arg(vl, int));
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; }
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; va_end(vl);
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; }
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!llvm.dbg.cu = !{!0}
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!llvm.module.flags = !{!9, !10}
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!llvm.ident = !{!11}
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!0 = distinct !DICompileUnit(language: DW_LANG_C99, producer: "clang version 3.5 ", isOptimized: false, emissionKind: FullDebug, file: !1, enums: !2, retainedTypes: !2, globals: !2, imports: !2)
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!1 = !DIFile(filename: "var.c", directory: "/tmp")
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!2 = !{}
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!4 = distinct !DISubprogram(name: "sum", line: 5, isLocal: false, isDefinition: true, virtualIndex: 6, flags: DIFlagPrototyped, isOptimized: false, unit: !0, scopeLine: 5, file: !1, scope: !5, type: !6, retainedNodes: !2)
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!5 = !DIFile(filename: "var.c", directory: "/tmp")
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!6 = !DISubroutineType(types: !7)
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!7 = !{!8, !8}
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!8 = !DIBasicType(tag: DW_TAG_base_type, name: "int", size: 32, align: 32, encoding: DW_ATE_signed)
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!9 = !{i32 2, !"Dwarf Version", i32 4}
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!10 = !{i32 1, !"Debug Info Version", i32 3}
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!11 = !{!"clang version 3.5 "}
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!12 = !DILocalVariable(name: "count", line: 5, arg: 1, scope: !4, file: !5, type: !8)
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!13 = !DILocation(line: 5, scope: !4)
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!14 = !DILocalVariable(name: "vl", line: 6, scope: !4, file: !5, type: !15)
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!15 = !DIDerivedType(tag: DW_TAG_typedef, name: "va_list", line: 30, file: !16, baseType: !17)
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!16 = !DIFile(filename: "/linux-x86_64-high/gcc_4.7.2/dbg/llvm/bin/../lib/clang/3.5/include/stdarg.h", directory: "/tmp")
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!17 = !DIDerivedType(tag: DW_TAG_typedef, name: "__builtin_va_list", line: 6, file: !1, baseType: !18)
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!18 = !DICompositeType(tag: DW_TAG_structure_type, name: "__va_list", line: 6, size: 32, align: 32, file: !1, elements: !19)
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!19 = !{!20}
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!20 = !DIDerivedType(tag: DW_TAG_member, name: "__ap", line: 6, size: 32, align: 32, file: !1, scope: !18, baseType: !21)
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!21 = !DIDerivedType(tag: DW_TAG_pointer_type, size: 32, align: 32, baseType: null)
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!22 = !DILocation(line: 6, scope: !4)
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!23 = !DILocation(line: 7, scope: !4)
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!24 = !DILocalVariable(name: "sum", line: 8, scope: !4, file: !5, type: !8)
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!25 = !DILocation(line: 8, scope: !4)
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!26 = !DILocalVariable(name: "i", line: 9, scope: !27, file: !5, type: !8)
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!27 = distinct !DILexicalBlock(line: 9, column: 0, file: !1, scope: !4)
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!28 = !DILocation(line: 9, scope: !27)
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!29 = !DILocation(line: 10, scope: !30)
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!30 = distinct !DILexicalBlock(line: 9, column: 0, file: !1, scope: !27)
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!31 = !DILocation(line: 11, scope: !30)
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!32 = !DILocation(line: 12, scope: !4)
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!33 = !DILocation(line: 13, scope: !4)
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; CHECK-FP-LABEL: sum
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; CHECK-FP: .cfi_startproc
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; CHECK-FP: sub sp, sp, #12
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; CHECK-FP: .cfi_def_cfa_offset 12
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; CHECK-FP: push {r4, lr}
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; CHECK-FP: .cfi_def_cfa_offset 20
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; CHECK-FP: .cfi_offset lr, -16
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; CHECK-FP: .cfi_offset r4, -20
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; CHECK-FP: sub sp, sp, #4
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; CHECK-FP: .cfi_def_cfa_offset 24
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; CHECK-FP-ELIM-LABEL: sum
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; CHECK-FP-ELIM: .cfi_startproc
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; CHECK-FP-ELIM: sub sp, sp, #12
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; CHECK-FP-ELIM: .cfi_def_cfa_offset 12
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; CHECK-FP-ELIM: push {r4, r10, r11, lr}
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; CHECK-FP-ELIM: .cfi_def_cfa_offset 28
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; CHECK-FP-ELIM: .cfi_offset lr, -16
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; CHECK-FP-ELIM: .cfi_offset r11, -20
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; CHECK-FP-ELIM: .cfi_offset r10, -24
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; CHECK-FP-ELIM: .cfi_offset r4, -28
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; CHECK-FP-ELIM: add r11, sp, #8
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; CHECK-FP-ELIM: .cfi_def_cfa r11, 20
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; CHECK-THUMB-FP-LABEL: sum
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; CHECK-THUMB-FP: .cfi_startproc
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; CHECK-THUMB-FP: sub sp, #12
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; CHECK-THUMB-FP: .cfi_def_cfa_offset 12
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; CHECK-THUMB-FP: push {r4, lr}
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; CHECK-THUMB-FP: .cfi_def_cfa_offset 20
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; CHECK-THUMB-FP: .cfi_offset lr, -16
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; CHECK-THUMB-FP: .cfi_offset r4, -20
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; CHECK-THUMB-FP: sub sp, #4
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; CHECK-THUMB-FP: .cfi_def_cfa_offset 24
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; CHECK-THUMB-FP-ELIM-LABEL: sum
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; CHECK-THUMB-FP-ELIM: .cfi_startproc
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; CHECK-THUMB-FP-ELIM: sub sp, #12
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; CHECK-THUMB-FP-ELIM: .cfi_def_cfa_offset 12
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; CHECK-THUMB-FP-ELIM: push {r4, r6, r7, lr}
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; CHECK-THUMB-FP-ELIM: .cfi_def_cfa_offset 28
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; CHECK-THUMB-FP-ELIM: .cfi_offset lr, -16
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; CHECK-THUMB-FP-ELIM: .cfi_offset r7, -20
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; CHECK-THUMB-FP-ELIM: .cfi_offset r6, -24
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; CHECK-THUMB-FP-ELIM: .cfi_offset r4, -28
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; CHECK-THUMB-FP-ELIM: add r7, sp, #8
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; CHECK-THUMB-FP-ELIM: .cfi_def_cfa r7, 20
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define i32 @sum(i32 %count, ...) !dbg !4 {
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entry:
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%vl = alloca i8*, align 4
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%vl1 = bitcast i8** %vl to i8*
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call void @llvm.va_start(i8* %vl1)
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%cmp4 = icmp sgt i32 %count, 0
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br i1 %cmp4, label %for.body, label %for.end
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for.body: ; preds = %entry, %for.body
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%i.05 = phi i32 [ %inc, %for.body ], [ 0, %entry ]
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%ap.cur = load i8*, i8** %vl, align 4
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%ap.next = getelementptr i8, i8* %ap.cur, i32 4
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store i8* %ap.next, i8** %vl, align 4
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%0 = bitcast i8* %ap.cur to i32*
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%1 = load i32, i32* %0, align 4
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%call = call i32 @foo(i32 %1) #1
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%inc = add nsw i32 %i.05, 1
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%exitcond = icmp eq i32 %inc, %count
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br i1 %exitcond, label %for.end, label %for.body
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for.end: ; preds = %for.body, %entry
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call void @llvm.va_end(i8* %vl1)
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ret i32 undef
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}
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declare void @llvm.va_start(i8*) nounwind
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declare i32 @foo(i32)
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declare void @llvm.va_end(i8*) nounwind
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