7b78956224
This removes an abuse of ELF linker behaviors while keeping Mach-O/COFF linker behaviors unchanged. ELF: when module_ctor is in a comdat, this patch removes reliance on a linker abuse (an SHT_INIT_ARRAY in a section group retains the whole group) by using SHF_GNU_RETAIN. No linker behavior difference when module_ctor is not in a comdat. Mach-O: module_ctor gets `N_NO_DEAD_STRIP`. No linker behavior difference because module_ctor is already referenced by a `S_MOD_INIT_FUNC_POINTERS` section (GC root). PE/COFF: no-op. SanitizerCoverage already appends module_ctor to `llvm.used`. Other sanitizers: llvm.used for local linkage is not implemented in `TargetLoweringObjectFileCOFF::emitLinkerDirectives` (once implemented or switched to a non-local linkage, COFF can use module_ctor in comdat (i.e. generalize ELF-specific rL301586)). There is no object file size difference. Reviewed By: vitalybuka Differential Revision: https://reviews.llvm.org/D106246
97 lines
3.0 KiB
LLVM
97 lines
3.0 KiB
LLVM
; RUN: opt < %s -tsan -S -enable-new-pm=0 | FileCheck %s
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; RUN: opt < %s -passes='function(tsan),module(tsan-module)' -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 @read_4_bytes(i32* %a) sanitize_thread {
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entry:
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%tmp1 = load i32, i32* %a, align 4
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ret i32 %tmp1
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}
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; CHECK: @llvm.used = appending global [1 x i8*] [i8* bitcast (void ()* @tsan.module_ctor to i8*)]
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; CHECK: @llvm.global_ctors = {{.*}}@tsan.module_ctor
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; CHECK: define i32 @read_4_bytes(i32* %a)
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; CHECK: call void @__tsan_func_entry(i8* %0)
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; CHECK-NEXT: %1 = bitcast i32* %a to i8*
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; CHECK-NEXT: call void @__tsan_read4(i8* %1)
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; CHECK-NEXT: %tmp1 = load i32, i32* %a, align 4
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; CHECK-NEXT: call void @__tsan_func_exit()
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; CHECK: ret i32
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declare void @llvm.memcpy.p0i8.p0i8.i64(i8* nocapture, i8* nocapture, i64, i1)
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declare void @llvm.memmove.p0i8.p0i8.i64(i8* nocapture, i8* nocapture, i64, i1)
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declare void @llvm.memset.p0i8.i64(i8* nocapture, i8, i64, i1)
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; Check that tsan converts mem intrinsics back to function calls.
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define void @MemCpyTest(i8* nocapture %x, i8* nocapture %y) sanitize_thread {
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entry:
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tail call void @llvm.memcpy.p0i8.p0i8.i64(i8* align 4 %x, i8* align 4 %y, i64 16, i1 false)
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ret void
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; CHECK: define void @MemCpyTest
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; CHECK: call i8* @memcpy
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; CHECK: ret void
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}
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define void @MemMoveTest(i8* nocapture %x, i8* nocapture %y) sanitize_thread {
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entry:
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tail call void @llvm.memmove.p0i8.p0i8.i64(i8* align 4 %x, i8* align 4 %y, i64 16, i1 false)
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ret void
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; CHECK: define void @MemMoveTest
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; CHECK: call i8* @memmove
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; CHECK: ret void
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}
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define void @MemSetTest(i8* nocapture %x) sanitize_thread {
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entry:
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tail call void @llvm.memset.p0i8.i64(i8* align 4 %x, i8 77, i64 16, i1 false)
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ret void
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; CHECK: define void @MemSetTest
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; CHECK: call i8* @memset
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; CHECK: ret void
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}
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; CHECK-LABEL: @SwiftError
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; CHECK-NOT: __tsan_read
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; CHECK-NOT: __tsan_write
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; CHECK: ret
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define void @SwiftError(i8** swifterror) sanitize_thread {
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%swifterror_ptr_value = load i8*, i8** %0
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store i8* null, i8** %0
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%swifterror_addr = alloca swifterror i8*
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%swifterror_ptr_value_2 = load i8*, i8** %swifterror_addr
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store i8* null, i8** %swifterror_addr
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ret void
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}
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; CHECK-LABEL: @SwiftErrorCall
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; CHECK-NOT: __tsan_read
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; CHECK-NOT: __tsan_write
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; CHECK: ret
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define void @SwiftErrorCall(i8** swifterror) sanitize_thread {
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%swifterror_addr = alloca swifterror i8*
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store i8* null, i8** %0
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call void @SwiftError(i8** %0)
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ret void
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}
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; CHECK-LABEL: @NakedTest(i32* %a)
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; CHECK-NEXT: call void @foo()
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; CHECK-NEXT: %tmp1 = load i32, i32* %a, align 4
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; CHECK-NEXT: ret i32 %tmp1
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define i32 @NakedTest(i32* %a) naked sanitize_thread {
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call void @foo()
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%tmp1 = load i32, i32* %a, align 4
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ret i32 %tmp1
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}
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declare void @foo() nounwind
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; CHECK: define internal void @tsan.module_ctor()
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; CHECK: call void @__tsan_init()
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