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[ASan] Make insertion of version mismatch guard configurable
By default ASan calls a versioned function `__asan_version_mismatch_check_vXXX` from the ASan module constructor to check that the compiler ABI version and runtime ABI version are compatible. This ensures that we get a predictable linker error instead of hard-to-debug runtime errors. Sometimes, however, we want to skip this safety guard. This new command line option allows us to do just that. rdar://47891956 Reviewed By: kubamracek Differential Revision: https://reviews.llvm.org/D66826 llvm-svn: 370258
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12 changes: 12 additions & 0 deletions
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llvm/test/Instrumentation/AddressSanitizer/version-mismatch-check.ll
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; Check that the ASan module constructor guards against compiler/runtime version | ||
; mismatch. | ||
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; RUN: opt < %s -asan-module -S | FileCheck %s | ||
; RUN: opt < %s -asan-module -asan-guard-against-version-mismatch=0 -S | FileCheck %s --check-prefix=NOGUARD | ||
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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" | ||
target triple = "x86_64-unknown-linux-gnu" | ||
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; CHECK-LABEL: define internal void @asan.module_ctor() | ||
; CHECK: call void @__asan_version_mismatch_check_v | ||
; NOGUARD-NOT: call void @__asan_version_mismatch_check_v |