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fc32a3e5d2
Summary: Rewrite asan's stack frame layout. First, most of the stack layout logic is moved into a separte file to make it more testable and (potentially) useful for other projects. Second, make the frames more compact by using adaptive redzones (smaller for small objects, larger for large objects). Third, try to minimized gaps due to large alignments (this is hypothetical since today we don't see many stack vars aligned by more than 32). The frames indeed become more compact, but I'll still need to run more benchmarks before committing, but I am sking for review now to get early feedback. This change will be accompanied by a trivial change in compiler-rt tests to match the new frame sizes. Reviewers: samsonov, dvyukov Reviewed By: samsonov CC: llvm-commits Differential Revision: http://llvm-reviews.chandlerc.com/D2324 llvm-svn: 196568
143 lines
3.8 KiB
LLVM
143 lines
3.8 KiB
LLVM
; Test basic address sanitizer instrumentation.
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;
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; RUN: opt < %s -asan -S | FileCheck %s
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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"
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target triple = "x86_64-unknown-linux-gnu"
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define i32 @test_load(i32* %a) sanitize_address {
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; CHECK: @test_load
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; CHECK-NOT: load
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; CHECK: %[[LOAD_ADDR:[^ ]*]] = ptrtoint i32* %a to i64
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; CHECK: lshr i64 %[[LOAD_ADDR]], 3
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; CHECK: {{or|add}}
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; CHECK: %[[LOAD_SHADOW_PTR:[^ ]*]] = inttoptr
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; CHECK: %[[LOAD_SHADOW:[^ ]*]] = load i8* %[[LOAD_SHADOW_PTR]]
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; CHECK: icmp ne i8
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; CHECK: br i1 %{{.*}}, label %{{.*}}, label %{{.*}}
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;
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; First instrumentation block refines the shadow test.
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; CHECK: and i64 %[[LOAD_ADDR]], 7
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; CHECK: add i64 %{{.*}}, 3
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; CHECK: trunc i64 %{{.*}} to i8
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; CHECK: icmp sge i8 %{{.*}}, %[[LOAD_SHADOW]]
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; CHECK: br i1 %{{.*}}, label %{{.*}}, label %{{.*}}
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;
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; The crash block reports the error.
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; CHECK: call void @__asan_report_load4(i64 %[[LOAD_ADDR]])
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; CHECK: unreachable
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;
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; The actual load.
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; CHECK: %tmp1 = load i32* %a
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; CHECK: ret i32 %tmp1
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entry:
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%tmp1 = load i32* %a
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ret i32 %tmp1
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}
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define void @test_store(i32* %a) sanitize_address {
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; CHECK: @test_store
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; CHECK-NOT: store
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; CHECK: %[[STORE_ADDR:[^ ]*]] = ptrtoint i32* %a to i64
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; CHECK: lshr i64 %[[STORE_ADDR]], 3
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; CHECK: {{or|add}}
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; CHECK: %[[STORE_SHADOW_PTR:[^ ]*]] = inttoptr
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; CHECK: %[[STORE_SHADOW:[^ ]*]] = load i8* %[[STORE_SHADOW_PTR]]
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; CHECK: icmp ne i8
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; CHECK: br i1 %{{.*}}, label %{{.*}}, label %{{.*}}
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;
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; First instrumentation block refines the shadow test.
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; CHECK: and i64 %[[STORE_ADDR]], 7
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; CHECK: add i64 %{{.*}}, 3
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; CHECK: trunc i64 %{{.*}} to i8
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; CHECK: icmp sge i8 %{{.*}}, %[[STORE_SHADOW]]
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; CHECK: br i1 %{{.*}}, label %{{.*}}, label %{{.*}}
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;
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; The crash block reports the error.
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; CHECK: call void @__asan_report_store4(i64 %[[STORE_ADDR]])
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; CHECK: unreachable
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;
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; The actual load.
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; CHECK: store i32 42, i32* %a
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; CHECK: ret void
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;
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entry:
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store i32 42, i32* %a
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ret void
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}
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; Check that asan leaves just one alloca.
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declare void @alloca_test_use([10 x i8]*)
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define void @alloca_test() sanitize_address {
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entry:
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%x = alloca [10 x i8], align 1
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%y = alloca [10 x i8], align 1
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%z = alloca [10 x i8], align 1
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call void @alloca_test_use([10 x i8]* %x)
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call void @alloca_test_use([10 x i8]* %y)
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call void @alloca_test_use([10 x i8]* %z)
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ret void
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}
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; CHECK: define void @alloca_test()
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; CHECK: = alloca
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; CHECK-NOT: = alloca
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; CHECK: ret void
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define void @LongDoubleTest(x86_fp80* nocapture %a) nounwind uwtable sanitize_address {
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entry:
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store x86_fp80 0xK3FFF8000000000000000, x86_fp80* %a, align 16
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ret void
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}
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; CHECK: LongDoubleTest
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; CHECK: __asan_report_store_n
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; CHECK: __asan_report_store_n
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; CHECK: ret void
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define void @i40test(i40* %a, i40* %b) nounwind uwtable sanitize_address {
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entry:
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%t = load i40* %a
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store i40 %t, i40* %b, align 8
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ret void
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}
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; CHECK: i40test
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; CHECK: __asan_report_load_n{{.*}}, i64 5)
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; CHECK: __asan_report_load_n{{.*}}, i64 5)
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; CHECK: __asan_report_store_n{{.*}}, i64 5)
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; CHECK: __asan_report_store_n{{.*}}, i64 5)
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; CHECK: ret void
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define void @i80test(i80* %a, i80* %b) nounwind uwtable sanitize_address {
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entry:
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%t = load i80* %a
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store i80 %t, i80* %b, align 8
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ret void
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}
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; CHECK: i80test
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; CHECK: __asan_report_load_n{{.*}}, i64 10)
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; CHECK: __asan_report_load_n{{.*}}, i64 10)
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; CHECK: __asan_report_store_n{{.*}}, i64 10)
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; CHECK: __asan_report_store_n{{.*}}, i64 10)
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; CHECK: ret void
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; asan should not instrument functions with available_externally linkage.
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define available_externally i32 @f_available_externally(i32* %a) sanitize_address {
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entry:
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%tmp1 = load i32* %a
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ret i32 %tmp1
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}
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; CHECK: @f_available_externally
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; CHECK-NOT: __asan_report
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; CHECK: ret i32
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