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5ae8c3d77e
The function stack poisioner conditionally stores local variables either in an alloca or in malloc'ated memory, which has the unfortunate side-effect, that the actual address of the variable is only materialized when the variable is accessed, which means that those variables are mostly invisible to the debugger even when compiling without optimizations. This patch stores the address of the local stack base into an alloca, which can be referred to by the debug info and is available throughout the function. This adds one extra pointer-sized alloca to each stack frame (but mem2reg can optimize it away again when optimizations are enabled, yielding roughly the same debug info quality as before in optimized code). rdar://problem/30433661 Differential Revision: https://reviews.llvm.org/D41034 llvm-svn: 320415
119 lines
4.4 KiB
LLVM
119 lines
4.4 KiB
LLVM
; Test the ASan's stack layout.
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; More tests in tests/Transforms/Utils/ASanStackFrameLayoutTest.cpp
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; RUN: opt < %s -asan -asan-module -asan-stack-dynamic-alloca=0 -asan-use-after-scope -S \
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; RUN: | FileCheck %s --check-prefixes=CHECK,CHECK-STATIC
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; RUN: opt < %s -asan -asan-module -asan-stack-dynamic-alloca=1 -asan-use-after-scope -S \
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; RUN: | FileCheck %s --check-prefixes=CHECK,CHECK-DYNAMIC
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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"
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target triple = "x86_64-unknown-linux-gnu"
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declare void @Use(i8*)
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declare void @llvm.lifetime.start.p0i8(i64, i8* nocapture) nounwind
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declare void @llvm.lifetime.end.p0i8(i64, i8* nocapture) nounwind
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; CHECK: private unnamed_addr constant{{.*}}3 32 10 3 XXX 64 20 3 YYY 128 30 3 ZZZ\0
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; CHECK: private unnamed_addr constant{{.*}}3 32 5 3 AAA 64 55 3 BBB 160 555 3 CCC\0
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; CHECK: private unnamed_addr constant{{.*}}3 256 128 3 CCC 448 128 3 BBB 608 128 3 AAA\0
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; CHECK: private unnamed_addr constant{{.*}}2 32 4 3 AAA 48 4 5 BBB:7\0
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define void @Func1() sanitize_address {
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entry:
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; CHECK-LABEL: Func1
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; CHECK-STATIC: alloca [192 x i8]
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; CHECK-STATIC: %asan_local_stack_base = alloca i64
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; CHECK-DYNAMIC: alloca i8, i64 192
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; CHECK-NOT: alloca
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; CHECK: ret void
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%XXX = alloca [10 x i8], align 1
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%YYY = alloca [20 x i8], align 1
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%ZZZ = alloca [30 x i8], align 1
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%arr1.ptr = bitcast [10 x i8]* %XXX to i8*
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store volatile i8 0, i8* %arr1.ptr
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%arr2.ptr = bitcast [20 x i8]* %YYY to i8*
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store volatile i8 0, i8* %arr2.ptr
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%arr3.ptr = bitcast [30 x i8]* %ZZZ to i8*
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store volatile i8 0, i8* %arr3.ptr
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ret void
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}
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define void @Func2() sanitize_address {
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entry:
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; CHECK-LABEL: Func2
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; CHECK-STATIC: alloca [864 x i8]
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; CHECK-STATIC: %asan_local_stack_base = alloca i64
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; CHECK-DYNAMIC: alloca i8, i64 864
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; CHECK-NOT: alloca
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; CHECK: ret void
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%AAA = alloca [5 x i8], align 1
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%BBB = alloca [55 x i8], align 1
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%CCC = alloca [555 x i8], align 1
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%arr1.ptr = bitcast [5 x i8]* %AAA to i8*
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store volatile i8 0, i8* %arr1.ptr
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%arr2.ptr = bitcast [55 x i8]* %BBB to i8*
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store volatile i8 0, i8* %arr2.ptr
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%arr3.ptr = bitcast [555 x i8]* %CCC to i8*
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store volatile i8 0, i8* %arr3.ptr
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ret void
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}
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; Check that we reorder vars according to alignment and handle large alignments.
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define void @Func3() sanitize_address {
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entry:
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; CHECK-LABEL: Func3
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; CHECK-STATIC: alloca [768 x i8]
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; CHECK-STATIC: %asan_local_stack_base = alloca i64
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; CHECK-DYNAMIC: alloca i8, i64 768
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; CHECK-NOT: alloca
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; CHECK: ret void
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%AAA = alloca [128 x i8], align 16
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%BBB = alloca [128 x i8], align 64
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%CCC = alloca [128 x i8], align 256
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%arr1.ptr = bitcast [128 x i8]* %AAA to i8*
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store volatile i8 0, i8* %arr1.ptr
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%arr2.ptr = bitcast [128 x i8]* %BBB to i8*
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store volatile i8 0, i8* %arr2.ptr
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%arr3.ptr = bitcast [128 x i8]* %CCC to i8*
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store volatile i8 0, i8* %arr3.ptr
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ret void
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}
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; Check that line numbers are attached to variable names if variable
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; in the same file as a function.
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define void @Func5() sanitize_address #0 !dbg !11 {
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%AAA = alloca i32, align 4 ; File is not the same as !11
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%BBB = alloca i32, align 4 ; File is the same as !11
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%BBB.ptr = bitcast i32* %BBB to i8*
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call void @llvm.lifetime.start.p0i8(i64 4, i8* nonnull %BBB.ptr), !dbg !12
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store volatile i32 5, i32* %BBB, align 4
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%AAA.ptr = bitcast i32* %AAA to i8*
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call void @llvm.lifetime.start.p0i8(i64 4, i8* nonnull %AAA.ptr), !dbg !14
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store volatile i32 3, i32* %AAA, align 4
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call void @llvm.lifetime.end.p0i8(i64 4, i8* nonnull %AAA.ptr), !dbg !17
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call void @llvm.lifetime.end.p0i8(i64 4, i8* nonnull %BBB.ptr), !dbg !18
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ret void
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}
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!llvm.dbg.cu = !{!0}
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!llvm.module.flags = !{!3, !4}
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!3 = !{i32 2, !"Dwarf Version", i32 4}
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!4 = !{i32 2, !"Debug Info Version", i32 3}
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!0 = distinct !DICompileUnit(language: DW_LANG_C99, file: !1)
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!1 = !DIFile(filename: "../file1.c", directory: "/")
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!11 = distinct !DISubprogram(name: "Func5", scope: !1, file: !1, line: 6, unit: !0)
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!12 = !DILocation(line: 7, column: 3, scope: !11)
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!18 = !DILocation(line: 10, column: 1, scope: !11)
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!21 = !DIFile(filename: "../file2.c", directory: "/")
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!6 = distinct !DISubprogram(name: "Func4", scope: !1, file: !21, line: 2, unit: !0)
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!15 = distinct !DILocation(line: 8, column: 3, scope: !11)
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!14 = !DILocation(line: 3, column: 3, scope: !6, inlinedAt: !15)
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!17 = !DILocation(line: 4, column: 1, scope: !6, inlinedAt: !15)
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