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llvm/test/DebugInfo/X86/debug-loc-asan.ll
Keno Fischer bae9026417 Clean up the processing of dbg.value in various places 
Summary:
First up is instcombine, where in the dbg.declare -> dbg.value conversion,
the llvm.dbg.value needs to be called on the actual loaded value, rather
than the address (since the whole point of this transformation is to be
able to get rid of the alloca). Further, now that that's cleaned up, we
can remove a hack in the backend, that would add an implicit OP_deref if
the argument to dbg.value was an alloca. This stems from before the
existence of DIExpression and is no longer necessary since the deref can
be expressed explicitly.

Now, in order to make sure that the tests pass with this change, we need to
correct the printing of DEBUG_VALUE comments to take into account the
expression, which wasn't taken into account before.

Unfortunately, for both these changes, there were a number of incorrect
test cases (mostly the wrong number of DW_OP_derefs, but also a couple
where the test itself was broken more badly). aprantl and I have gone
through and adjusted these test case in order to make them pass with
these fixes and in some cases to make sure they're actually testing
what they are meant to test.

Reviewers: aprantl

Subscribers: dsanders

Differential Revision: http://reviews.llvm.org/D14186

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@256077 91177308-0d34-0410-b5e6-96231b3b80d8
2015-12-19 02:02:44 +00:00

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; RUN: llc -O0 -mtriple=x86_64-unknown-linux-gnu < %s | FileCheck %s
; Verify that we have correct debug info for local variables in code
; instrumented with AddressSanitizer.
; Generated from the source file test.cc:
; int bar(int y) {
; return y + 2;
; }
; with "clang++ -S -emit-llvm -mllvm -asan-skip-promotable-allocas=0 -fsanitize=address -O0 -g test.cc"
; The address of the (potentially now malloc'ed) alloca ends up
; in RDI, after which it is spilled to the stack. We record the
; spill OFFSET on the stack for checking the debug info below.
; CHECK: #DEBUG_VALUE: bar:y <- [%RDI+0]
; CHECK: movq %rdi, [[OFFSET:[0-9]+]](%rsp)
; CHECK-NEXT: [[START_LABEL:.Ltmp[0-9]+]]
; This location should be valid until the end of the function.
; CHECK: .Ldebug_loc{{[0-9]+}}:
; We expect two location ranges for the variable.
; First, its address is stored in %rdi:
; CHECK: .quad .Lfunc_begin0-.Lfunc_begin0
; CHECK-NEXT: .quad [[START_LABEL]]-.Lfunc_begin0
; CHECK: DW_OP_breg5
; Then it's addressed via %rsp:
; CHECK: .quad [[START_LABEL]]-.Lfunc_begin0
; CHECK-NEXT: .Lfunc_end0-.Lfunc_begin0
; CHECK: DW_OP_breg7
; CHECK-NEXT: [[OFFSET]]
; CHECK: DW_OP_deref
; ModuleID = 'test.cc'
target datalayout = "e-m:e-i64:64-f80:128-n8:16:32:64-S128"
target triple = "x86_64-unknown-linux-gnu"
@llvm.global_ctors = appending global [1 x { i32, void ()* }] [{ i32, void ()* } { i32 1, void ()* @asan.module_ctor }]
@__asan_option_detect_stack_use_after_return = external global i32
@__asan_gen_ = private unnamed_addr constant [16 x i8] c"1 32 4 6 y.addr\00", align 1
; Function Attrs: nounwind sanitize_address uwtable
define i32 @_Z3bari(i32 %y) #0 !dbg !4 {
entry:
%MyAlloca = alloca [64 x i8], align 32
%0 = ptrtoint [64 x i8]* %MyAlloca to i64
%1 = load i32, i32* @__asan_option_detect_stack_use_after_return
%2 = icmp ne i32 %1, 0
br i1 %2, label %3, label %5
; <label>:3 ; preds = %entry
%4 = call i64 @__asan_stack_malloc_0(i64 64, i64 %0)
br label %5
; <label>:5 ; preds = %entry, %3
%6 = phi i64 [ %0, %entry ], [ %4, %3 ]
%7 = add i64 %6, 32
%8 = inttoptr i64 %7 to i32*
%9 = inttoptr i64 %6 to i64*
store i64 1102416563, i64* %9
%10 = add i64 %6, 8
%11 = inttoptr i64 %10 to i64*
store i64 ptrtoint ([16 x i8]* @__asan_gen_ to i64), i64* %11
%12 = add i64 %6, 16
%13 = inttoptr i64 %12 to i64*
store i64 ptrtoint (i32 (i32)* @_Z3bari to i64), i64* %13
%14 = lshr i64 %6, 3
%15 = add i64 %14, 2147450880
%16 = add i64 %15, 0
%17 = inttoptr i64 %16 to i64*
store i64 -868083100587789839, i64* %17
%18 = ptrtoint i32* %8 to i64
%19 = lshr i64 %18, 3
%20 = add i64 %19, 2147450880
%21 = inttoptr i64 %20 to i8*
%22 = load i8, i8* %21
%23 = icmp ne i8 %22, 0
call void @llvm.dbg.declare(metadata i32* %8, metadata !12, metadata !14), !dbg !DILocation(scope: !4)
br i1 %23, label %24, label %30
; <label>:24 ; preds = %5
%25 = and i64 %18, 7
%26 = add i64 %25, 3
%27 = trunc i64 %26 to i8
%28 = icmp sge i8 %27, %22
br i1 %28, label %29, label %30
; <label>:29 ; preds = %24
call void @__asan_report_store4(i64 %18)
call void asm sideeffect "", ""()
unreachable
; <label>:30 ; preds = %24, %5
store i32 %y, i32* %8, align 4
%31 = ptrtoint i32* %8 to i64, !dbg !13
%32 = lshr i64 %31, 3, !dbg !13
%33 = add i64 %32, 2147450880, !dbg !13
%34 = inttoptr i64 %33 to i8*, !dbg !13
%35 = load i8, i8* %34, !dbg !13
%36 = icmp ne i8 %35, 0, !dbg !13
br i1 %36, label %37, label %43, !dbg !13
; <label>:37 ; preds = %30
%38 = and i64 %31, 7, !dbg !13
%39 = add i64 %38, 3, !dbg !13
%40 = trunc i64 %39 to i8, !dbg !13
%41 = icmp sge i8 %40, %35, !dbg !13
br i1 %41, label %42, label %43
; <label>:42 ; preds = %37
call void @__asan_report_load4(i64 %31), !dbg !13
call void asm sideeffect "", ""()
unreachable
; <label>:43 ; preds = %37, %30
%44 = load i32, i32* %8, align 4, !dbg !13
%add = add nsw i32 %44, 2, !dbg !13
store i64 1172321806, i64* %9, !dbg !13
%45 = icmp ne i64 %6, %0, !dbg !13
br i1 %45, label %46, label %53, !dbg !13
; <label>:46 ; preds = %43
%47 = add i64 %15, 0, !dbg !13
%48 = inttoptr i64 %47 to i64*, !dbg !13
store i64 -723401728380766731, i64* %48, !dbg !13
%49 = add i64 %6, 56, !dbg !13
%50 = inttoptr i64 %49 to i64*, !dbg !13
%51 = load i64, i64* %50, !dbg !13
%52 = inttoptr i64 %51 to i8*, !dbg !13
store i8 0, i8* %52, !dbg !13
br label %56, !dbg !13
; <label>:53 ; preds = %43
%54 = add i64 %15, 0, !dbg !13
%55 = inttoptr i64 %54 to i64*, !dbg !13
store i64 0, i64* %55, !dbg !13
br label %56, !dbg !13
; <label>:56 ; preds = %53, %46
ret i32 %add, !dbg !13
}
; Function Attrs: nounwind readnone
declare void @llvm.dbg.declare(metadata, metadata, metadata) #1
define internal void @asan.module_ctor() {
call void @__asan_init_v3()
ret void
}
declare void @__asan_init_v3()
declare void @__asan_report_load4(i64)
declare void @__asan_report_store4(i64)
declare i64 @__asan_stack_malloc_0(i64, i64)
attributes #0 = { nounwind sanitize_address uwtable "less-precise-fpmad"="false" "no-frame-pointer-elim"="true" "no-frame-pointer-elim-non-leaf" "no-infs-fp-math"="false" "no-nans-fp-math"="false" "stack-protector-buffer-size"="8" "unsafe-fp-math"="false" "use-soft-float"="false" }
attributes #1 = { nounwind readnone }
!llvm.dbg.cu = !{!0}
!llvm.module.flags = !{!9, !10}
!llvm.ident = !{!11}
!0 = distinct !DICompileUnit(language: DW_LANG_C_plus_plus, producer: "clang version 3.5.0 (209308)", isOptimized: false, emissionKind: 1, file: !1, enums: !2, retainedTypes: !2, subprograms: !3, globals: !2, imports: !2)
!1 = !DIFile(filename: "test.cc", directory: "/llvm_cmake_gcc")
!2 = !{}
!3 = !{!4}
!4 = distinct !DISubprogram(name: "bar", linkageName: "_Z3bari", line: 1, isLocal: false, isDefinition: true, virtualIndex: 6, flags: DIFlagPrototyped, isOptimized: false, scopeLine: 1, file: !1, scope: !5, type: !6, variables: !2)
!5 = !DIFile(filename: "test.cc", directory: "/llvm_cmake_gcc")
!6 = !DISubroutineType(types: !7)
!7 = !{!8, !8}
!8 = !DIBasicType(tag: DW_TAG_base_type, name: "int", size: 32, align: 32, encoding: DW_ATE_signed)
!9 = !{i32 2, !"Dwarf Version", i32 4}
!10 = !{i32 2, !"Debug Info Version", i32 3}
!11 = !{!"clang version 3.5.0 (209308)"}
!12 = !DILocalVariable(name: "y", line: 1, arg: 1, scope: !4, file: !5, type: !8)
!13 = !DILocation(line: 2, scope: !4)
!14 = !DIExpression(DW_OP_deref)
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