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llvm-mirror/test/DebugInfo/X86/dbg_value_direct.ll
Peter Collingbourne 5b721561aa DI: Reverse direction of subprogram -> function edge. 
Previously, subprograms contained a metadata reference to the function they
described. Because most clients need to get or set a subprogram for a given
function rather than the other way around, this created unneeded inefficiency.

For example, many passes needed to call the function llvm::makeSubprogramMap()
to build a mapping from functions to subprograms, and the IR linker needed to
fix up function references in a way that caused quadratic complexity in the IR
linking phase of LTO.

This change reverses the direction of the edge by storing the subprogram as
function-level metadata and removing DISubprogram's function field.

Since this is an IR change, a bitcode upgrade has been provided.

Fixes PR23367. An upgrade script for textual IR for out-of-tree clients is
attached to the PR.

Differential Revision: http://reviews.llvm.org/D14265

llvm-svn: 252219
2015-11-05 22:03:56 +00:00

177 lines
6.7 KiB
LLVM
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; RUN: llc -filetype=obj -O0 < %s
; Test that we handle DBG_VALUEs in a register without crashing.
;
; Generated from clang with -fsanitize=address:
; struct A {
; A();
; A(const A&);
; };
;
; A func(int) {
; A a;
; return a;
; }
target datalayout = "e-p:64:64:64-i1:8:8-i8:8:8-i16:16:16-i32:32:32-i64:64:64-f32:32:32-f64:64:64-v64:64:64-v128:128:128-a0:0:64-s0:64:64-f80:128:128-n8:16:32:64-S128"
target triple = "x86_64-unknown-linux-gnu"
%struct.A = type { i8 }
@__asan_mapping_offset = linkonce_odr constant i64 2147450880
@__asan_mapping_scale = linkonce_odr constant i64 3
@llvm.global_ctors = appending global [1 x { i32, void ()* }] [{ i32, void ()* } { i32 1, void ()* @asan.module_ctor }]
@__asan_gen_ = private unnamed_addr constant [16 x i8] c"1 32 4 5 .addr \00", align 1
; Function Attrs: sanitize_address uwtable
define void @_Z4funci(%struct.A* noalias sret %agg.result, i32) #0 "stack-protector-buffer-size"="1" !dbg !4 {
entry:
%MyAlloca = alloca [96 x i8], align 32
%1 = ptrtoint [96 x i8]* %MyAlloca to i64
%2 = add i64 %1, 32
%3 = inttoptr i64 %2 to i32*
%4 = inttoptr i64 %1 to i64*
store i64 1102416563, i64* %4
%5 = add i64 %1, 8
%6 = inttoptr i64 %5 to i64*
store i64 ptrtoint ([16 x i8]* @__asan_gen_ to i64), i64* %6
%7 = add i64 %1, 16
%8 = inttoptr i64 %7 to i64*
store i64 ptrtoint (void (%struct.A*, i32)* @_Z4funci to i64), i64* %8
%9 = lshr i64 %1, 3
%10 = add i64 %9, 2147450880
%11 = inttoptr i64 %10 to i32*
store i32 -235802127, i32* %11
%12 = add i64 %10, 4
%13 = inttoptr i64 %12 to i32*
store i32 -185273340, i32* %13
%14 = add i64 %10, 8
%15 = inttoptr i64 %14 to i32*
store i32 -202116109, i32* %15
%16 = ptrtoint i32* %3 to i64
%17 = lshr i64 %16, 3
%18 = add i64 %17, 2147450880
%19 = inttoptr i64 %18 to i8*
%20 = load i8, i8* %19
%21 = icmp ne i8 %20, 0
call void @llvm.dbg.declare(metadata i32* %3, metadata !23, metadata !28), !dbg !DILocation(scope: !4)
br i1 %21, label %22, label %28
; <label>:22 ; preds = %entry
%23 = and i64 %16, 7
%24 = add i64 %23, 3
%25 = trunc i64 %24 to i8
%26 = icmp sge i8 %25, %20
br i1 %26, label %27, label %28
; <label>:27 ; preds = %22
call void @__asan_report_store4(i64 %16)
call void asm sideeffect "", ""()
unreachable
; <label>:28 ; preds = %22, %entry
store i32 %0, i32* %3, align 4
call void @llvm.dbg.declare(metadata %struct.A* %agg.result, metadata !24, metadata !DIExpression(DW_OP_deref)), !dbg !25
call void @_ZN1AC1Ev(%struct.A* %agg.result), !dbg !25
store i64 1172321806, i64* %4, !dbg !26
%29 = inttoptr i64 %10 to i32*, !dbg !26
store i32 0, i32* %29, !dbg !26
%30 = add i64 %10, 4, !dbg !26
%31 = inttoptr i64 %30 to i32*, !dbg !26
store i32 0, i32* %31, !dbg !26
%32 = add i64 %10, 8, !dbg !26
%33 = inttoptr i64 %32 to i32*, !dbg !26
store i32 0, i32* %33, !dbg !26
ret void, !dbg !26
}
; Function Attrs: nounwind readnone
declare void @llvm.dbg.declare(metadata, metadata, metadata) #1
declare void @_ZN1AC1Ev(%struct.A*) #2
define internal void @asan.module_ctor() "stack-protector-buffer-size"="1" {
call void @__asan_init_v3()
%1 = load volatile i64, i64* @__asan_mapping_offset
%2 = load volatile i64, i64* @__asan_mapping_scale
ret void
}
declare void @__asan_init_v3()
declare void @__asan_report_load1(i64)
declare void @__asan_report_load2(i64)
declare void @__asan_report_load4(i64)
declare void @__asan_report_load8(i64)
declare void @__asan_report_load16(i64)
declare void @__asan_report_store1(i64)
declare void @__asan_report_store2(i64)
declare void @__asan_report_store4(i64)
declare void @__asan_report_store8(i64)
declare void @__asan_report_store16(i64)
declare void @__asan_report_load_n(i64, i64)
declare void @__asan_report_store_n(i64, i64)
declare void @__asan_handle_no_return()
declare i64 @__asan_stack_malloc(i64, i64)
declare void @__asan_stack_free(i64, i64, i64)
declare void @__asan_poison_stack_memory(i64, i64)
declare void @__asan_unpoison_stack_memory(i64, i64)
declare void @__asan_before_dynamic_init(i64)
declare void @__asan_after_dynamic_init()
declare void @__asan_register_globals(i64, i64)
declare void @__asan_unregister_globals(i64, i64)
attributes #0 = { sanitize_address uwtable "less-precise-fpmad"="false" "no-frame-pointer-elim"="true" "no-frame-pointer-elim-non-leaf"="true" "no-infs-fp-math"="false" "no-nans-fp-math"="false" "ssp-buffer-size"="8" "unsafe-fp-math"="false" "use-soft-float"="false" }
attributes #1 = { nounwind readnone }
attributes #2 = { "less-precise-fpmad"="false" "no-frame-pointer-elim"="true" "no-frame-pointer-elim-non-leaf"="true" "no-infs-fp-math"="false" "no-nans-fp-math"="false" "ssp-buffer-size"="8" "unsafe-fp-math"="false" "use-soft-float"="false" }
!llvm.dbg.cu = !{!0}
!llvm.module.flags = !{!22, !27}
!0 = distinct !DICompileUnit(language: DW_LANG_C_plus_plus, producer: "clang version 3.4 ", isOptimized: false, emissionKind: 1, file: !1, enums: !2, retainedTypes: !2, subprograms: !3, globals: !2, imports: !2)
!1 = !DIFile(filename: "crash.cpp", directory: "/tmp")
!2 = !{}
!3 = !{!4}
!4 = distinct !DISubprogram(name: "func", linkageName: "_Z4funci", line: 6, isLocal: false, isDefinition: true, virtualIndex: 6, flags: DIFlagPrototyped, isOptimized: false, scopeLine: 6, file: !1, scope: !5, type: !6, variables: !2)
!5 = !DIFile(filename: "crash.cpp", directory: "/tmp")
!6 = !DISubroutineType(types: !7)
!7 = !{!8, !21}
!8 = !DICompositeType(tag: DW_TAG_structure_type, name: "A", line: 1, size: 8, align: 8, file: !1, elements: !9)
!9 = !{!10, !15}
!10 = !DISubprogram(name: "A", line: 2, isLocal: false, isDefinition: false, virtualIndex: 6, flags: DIFlagPrototyped, isOptimized: false, scopeLine: 2, file: !1, scope: !8, type: !11)
!11 = !DISubroutineType(types: !12)
!12 = !{null, !13}
!13 = !DIDerivedType(tag: DW_TAG_pointer_type, size: 64, align: 64, flags: DIFlagArtificial | DIFlagObjectPointer, baseType: !8)
!15 = !DISubprogram(name: "A", line: 3, isLocal: false, isDefinition: false, virtualIndex: 6, flags: DIFlagPrototyped, isOptimized: false, scopeLine: 3, file: !1, scope: !8, type: !16)
!16 = !DISubroutineType(types: !17)
!17 = !{null, !13, !18}
!18 = !DIDerivedType(tag: DW_TAG_reference_type, baseType: !19)
!19 = !DIDerivedType(tag: DW_TAG_const_type, baseType: !8)
!21 = !DIBasicType(tag: DW_TAG_base_type, name: "int", size: 32, align: 32, encoding: DW_ATE_signed)
!22 = !{i32 2, !"Dwarf Version", i32 3}
!23 = !DILocalVariable(name: "", line: 6, arg: 1, scope: !4, file: !5, type: !21)
!24 = !DILocalVariable(name: "a", line: 7, scope: !4, file: !5, type: !8)
!25 = !DILocation(line: 7, scope: !4)
!26 = !DILocation(line: 8, scope: !4)
!27 = !{i32 1, !"Debug Info Version", i32 3}
!28 = !DIExpression(DW_OP_deref)
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