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a8a13bc662
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. git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@331841 91177308-0d34-0410-b5e6-96231b3b80d8
95 lines
2.8 KiB
LLVM
95 lines
2.8 KiB
LLVM
; RUN: llc -mcpu=core2 -mtriple=i686-pc-win32 -O0 < %s | FileCheck --check-prefix=X86 %s
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; This LL file was generated by running clang on the following code with
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; -fsanitize=address
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; D:\asan.c:
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; 1 int foo(void) {
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; 2 return 0;
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; 3 }
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; The module ctor has no debug info. All we have to do is don't crash.
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; X86: _asan.module_ctor:
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; X86-NEXT: L{{.*}}:
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; X86: # %bb.
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; X86-NEXT: calll ___asan_init_v3
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; X86-NEXT: retl
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; Make sure we don't put any DWARF debug info for ASan-instrumented modules.
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; X86-NOT: DWARF
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; ModuleID = 'asan.c'
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target datalayout = "e-m:w-p:32:32-i64:64-f80:32-n8:16:32-S32"
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target triple = "i686-pc-win32"
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@llvm.global_ctors = appending global [1 x { i32, void ()* }] [{ i32, void ()* } { i32 1, void ()* @asan.module_ctor }]
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; Function Attrs: nounwind sanitize_address
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define i32 @foo() #0 !dbg !4 {
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entry:
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ret i32 0, !dbg !10
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}
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define internal void @asan.module_ctor() {
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call void @__asan_init_v3()
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ret void
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}
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declare void @__asan_init_v3()
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declare void @__asan_report_load1(i32)
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declare void @__asan_report_load2(i32)
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declare void @__asan_report_load4(i32)
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declare void @__asan_report_load8(i32)
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declare void @__asan_report_load16(i32)
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declare void @__asan_report_store1(i32)
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declare void @__asan_report_store2(i32)
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declare void @__asan_report_store4(i32)
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declare void @__asan_report_store8(i32)
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declare void @__asan_report_store16(i32)
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declare void @__asan_report_load_n(i32, i32)
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declare void @__asan_report_store_n(i32, i32)
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declare void @__asan_handle_no_return()
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declare void @__sanitizer_cov()
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declare void @__sanitizer_ptr_cmp(i32, i32)
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declare void @__sanitizer_ptr_sub(i32, i32)
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declare void @__asan_before_dynamic_init(i32)
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declare void @__asan_after_dynamic_init()
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declare void @__asan_register_globals(i32, i32)
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declare void @__asan_unregister_globals(i32, i32)
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attributes #0 = { nounwind sanitize_address "less-precise-fpmad"="false" "no-frame-pointer-elim"="false" "no-infs-fp-math"="false" "no-nans-fp-math"="false" "no-realign-stack" "stack-protector-buffer-size"="8" "unsafe-fp-math"="false" "use-soft-float"="false" }
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!llvm.dbg.cu = !{!0}
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!llvm.module.flags = !{!7, !8}
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!llvm.ident = !{!9}
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!0 = distinct !DICompileUnit(language: DW_LANG_C99, producer: "clang version 3.5.0 ", isOptimized: false, emissionKind: LineTablesOnly, file: !1, enums: !2, retainedTypes: !2, globals: !2, imports: !2)
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!1 = !DIFile(filename: "asan.c", directory: "D:\5C")
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!2 = !{}
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!4 = distinct !DISubprogram(name: "foo", line: 1, isLocal: false, isDefinition: true, virtualIndex: 6, flags: DIFlagPrototyped, isOptimized: false, unit: !0, scopeLine: 1, file: !1, scope: !5, type: !6, retainedNodes: !2)
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!5 = !DIFile(filename: "asan.c", directory: "D:C")
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!6 = !DISubroutineType(types: !2)
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!7 = !{i32 2, !"CodeView", i32 1}
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!8 = !{i32 1, !"Debug Info Version", i32 3}
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!9 = !{!"clang version 3.5.0 "}
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!10 = !DILocation(line: 2, scope: !4)
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