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llvm-project/llvm/test/Instrumentation/AddressSanitizer/experiment.ll

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asan: optimization experiments The experiments can be used to evaluate potential optimizations that remove instrumentation (assess false negatives). Instead of completely removing some instrumentation, you set Exp to a non-zero value (mask of optimization experiments that want to remove instrumentation of this instruction). If Exp is non-zero, this pass will emit special calls into runtime (e.g. __asan_report_exp_load1 instead of __asan_report_load1). These calls make runtime terminate the program in a special way (with a different exit status). Then you run the new compiler on a buggy corpus, collect the special terminations (ideally, you don't see them at all -- no false negatives) and make the decision on the optimization. The exact reaction to experiments in runtime is not implemented in this patch. It will be defined and implemented in a subsequent patch. http://reviews.llvm.org/D8198 llvm-svn: 232502
2015-03-18 00:59:19 +08:00
; Test optimization experiments.
; -asan-force-experiment flag turns all memory accesses into experiments.
; RUN: opt < %s -asan -asan-module -asan-force-experiment=42 -S | FileCheck %s
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"
target triple = "x86_64-unknown-linux-gnu"
define void @load1(i8* %p) sanitize_address {
entry:
%t = load i8, i8* %p, align 1
ret void
; CHECK-LABEL: define void @load1
; CHECK: __asan_report_exp_load1{{.*}} i32 42
; CHECK: ret void
}
define void @load2(i16* %p) sanitize_address {
entry:
%t = load i16, i16* %p, align 2
ret void
; CHECK-LABEL: define void @load2
; CHECK: __asan_report_exp_load2{{.*}} i32 42
; CHECK: ret void
}
define void @load4(i32* %p) sanitize_address {
entry:
%t = load i32, i32* %p, align 4
ret void
; CHECK-LABEL: define void @load4
; CHECK: __asan_report_exp_load4{{.*}} i32 42
; CHECK: ret void
}
define void @load8(i64* %p) sanitize_address {
entry:
%t = load i64, i64* %p, align 8
ret void
; CHECK-LABEL: define void @load8
; CHECK: __asan_report_exp_load8{{.*}} i32 42
; CHECK: ret void
}
define void @load16(i128* %p) sanitize_address {
entry:
%t = load i128, i128* %p, align 16
ret void
; CHECK-LABEL: define void @load16
; CHECK: __asan_report_exp_load16{{.*}} i32 42
; CHECK: ret void
}
define void @loadN(i48* %p) sanitize_address {
entry:
%t = load i48, i48* %p, align 1
ret void
; CHECK-LABEL: define void @loadN
; CHECK: __asan_report_exp_load_n{{.*}} i32 42
; CHECK: ret void
}
define void @store1(i8* %p) sanitize_address {
entry:
store i8 1, i8* %p, align 1
ret void
; CHECK-LABEL: define void @store1
; CHECK: __asan_report_exp_store1{{.*}} i32 42
; CHECK: ret void
}
define void @store2(i16* %p) sanitize_address {
entry:
store i16 1, i16* %p, align 2
ret void
; CHECK-LABEL: define void @store2
; CHECK: __asan_report_exp_store2{{.*}} i32 42
; CHECK: ret void
}
define void @store4(i32* %p) sanitize_address {
entry:
store i32 1, i32* %p, align 4
ret void
; CHECK-LABEL: define void @store4
; CHECK: __asan_report_exp_store4{{.*}} i32 42
; CHECK: ret void
}
define void @store8(i64* %p) sanitize_address {
entry:
store i64 1, i64* %p, align 8
ret void
; CHECK-LABEL: define void @store8
; CHECK: __asan_report_exp_store8{{.*}} i32 42
; CHECK: ret void
}
define void @store16(i128* %p) sanitize_address {
entry:
store i128 1, i128* %p, align 16
ret void
; CHECK-LABEL: define void @store16
; CHECK: __asan_report_exp_store16{{.*}} i32 42
; CHECK: ret void
}
define void @storeN(i48* %p) sanitize_address {
entry:
store i48 1, i48* %p, align 1
ret void
; CHECK-LABEL: define void @storeN
; CHECK: __asan_report_exp_store_n{{.*}} i32 42
; CHECK: ret void
}