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https://github.com/c64scene-ar/llvm-6502.git
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3386d25257
Summary: Given a global array G[N], which is declared in this CU and has static initializer avoid instrumenting accesses like G[i], where 'i' is a constant and 0<=i<N. Also add a bit of stats. This eliminates ~1% of instrumentations on SPEC2006 and also partially helps when asan is being run together with coverage. Reviewers: samsonov Reviewed By: samsonov CC: llvm-commits Differential Revision: http://llvm-reviews.chandlerc.com/D1947 git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@192794 91177308-0d34-0410-b5e6-96231b3b80d8
57 lines
1.9 KiB
LLVM
57 lines
1.9 KiB
LLVM
; RUN: opt < %s -basicaa -gvn -asan -S | FileCheck %s
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; ASAN conflicts with load widening iff the widened load accesses data out of bounds
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; (while the original unwidened loads do not).
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; http://code.google.com/p/address-sanitizer/issues/detail?id=20#c1
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; 32-bit little endian target.
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target datalayout = "e-p:32:32:32-i1:8:8-i8:8:8-i16:16:16-i32:32:32-i64:32:64-f32:32:32-f64:32:64-v64:64:64-v128:128:128-a0:0:64-f80:128:128-n8:16:32"
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%struct_of_7_bytes_4_aligned = type { i32, i8, i8, i8}
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@f = external global %struct_of_7_bytes_4_aligned , align 4
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; Accessing bytes 4 and 6, not ok to widen to i32 if sanitize_address is set.
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define i32 @test_widening_bad(i8* %P) nounwind ssp noredzone sanitize_address {
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entry:
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%tmp = load i8* getelementptr inbounds (%struct_of_7_bytes_4_aligned* @f, i64 0, i32 1), align 4
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%conv = zext i8 %tmp to i32
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%tmp1 = load i8* getelementptr inbounds (%struct_of_7_bytes_4_aligned* @f, i64 0, i32 3), align 1
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%conv2 = zext i8 %tmp1 to i32
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%add = add nsw i32 %conv, %conv2
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ret i32 %add
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; CHECK: @test_widening_bad
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; CHECK: __asan_report_load1
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; CHECK: __asan_report_load1
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; CHECK-NOT: __asan_report
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; We can not use check for "ret" here because __asan_report_load1 calls live after ret.
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; CHECK: end_test_widening_bad
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}
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define void @end_test_widening_bad() {
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entry:
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ret void
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}
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;; Accessing bytes 4 and 5. Ok to widen to i16.
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define i32 @test_widening_ok(i8* %P) nounwind ssp noredzone sanitize_address {
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entry:
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%tmp = load i8* getelementptr inbounds (%struct_of_7_bytes_4_aligned* @f, i64 0, i32 1), align 4
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%conv = zext i8 %tmp to i32
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%tmp1 = load i8* getelementptr inbounds (%struct_of_7_bytes_4_aligned* @f, i64 0, i32 2), align 1
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%conv2 = zext i8 %tmp1 to i32
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%add = add nsw i32 %conv, %conv2
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ret i32 %add
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; CHECK: @test_widening_ok
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; CHECK: __asan_report_load2
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; CHECK-NOT: __asan_report
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; CHECK: end_test_widening_ok
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}
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define void @end_test_widening_ok() {
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entry:
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ret void
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}
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