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//===--- rtsan_context.cpp - Realtime Sanitizer -----------------*- C++ -*-===//
//
// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
// See https://llvm.org/LICENSE.txt for license information.
// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
//
//===----------------------------------------------------------------------===//
//
//===----------------------------------------------------------------------===//
#include <rtsan/rtsan_context.h>
#include <rtsan/rtsan_stack.h>
#include <sanitizer_common/sanitizer_allocator_internal.h>
#include <sanitizer_common/sanitizer_stacktrace.h>
#include <new>
#include <pthread.h>
#include <stdio.h>
#include <stdlib.h>
static pthread_key_t context_key;
static pthread_once_t key_once = PTHREAD_ONCE_INIT;
// InternalFree cannot be passed directly to pthread_key_create
// because it expects a signature with only one arg
static void InternalFreeWrapper(void *ptr) { __sanitizer::InternalFree(ptr); }
static __rtsan::Context &GetContextForThisThreadImpl() {
auto make_thread_local_context_key = []() {
CHECK_EQ(pthread_key_create(&context_key, InternalFreeWrapper), 0);
};
pthread_once(&key_once, make_thread_local_context_key);
__rtsan::Context *current_thread_context =
static_cast<__rtsan::Context *>(pthread_getspecific(context_key));
if (current_thread_context == nullptr) {
current_thread_context = static_cast<__rtsan::Context *>(
__sanitizer::InternalAlloc(sizeof(__rtsan::Context)));
new (current_thread_context) __rtsan::Context();
pthread_setspecific(context_key, current_thread_context);
}
return *current_thread_context;
}
/*
This is a placeholder stub for a future feature that will allow
a user to configure RTSan's behaviour when a real-time safety
violation is detected. The RTSan developers intend for the
following choices to be made available, via a RTSAN_OPTIONS
environment variable, in a future PR:
i) exit,
ii) continue, or
iii) wait for user input from stdin.
Until then, and to keep the first PRs small, only the exit mode
is available.
*/
static void InvokeViolationDetectedAction() { exit(EXIT_FAILURE); }
__rtsan::Context::Context() = default;
void __rtsan::Context::RealtimePush() { realtime_depth++; }
void __rtsan::Context::RealtimePop() { realtime_depth--; }
void __rtsan::Context::BypassPush() { bypass_depth++; }
void __rtsan::Context::BypassPop() { bypass_depth--; }
void __rtsan::Context::ExpectNotRealtime(
const char *intercepted_function_name) {
if (InRealtimeContext() && !IsBypassed()) {
BypassPush();
PrintDiagnostics(intercepted_function_name);
InvokeViolationDetectedAction();
BypassPop();
}
}
bool __rtsan::Context::InRealtimeContext() const { return realtime_depth > 0; }
bool __rtsan::Context::IsBypassed() const { return bypass_depth > 0; }
void __rtsan::Context::PrintDiagnostics(const char *intercepted_function_name) {
fprintf(stderr,
"Real-time violation: intercepted call to real-time unsafe function "
"`%s` in real-time context! Stack trace:\n",
intercepted_function_name);
__rtsan::PrintStackTrace();
}
__rtsan::Context &__rtsan::GetContextForThisThread() {
return GetContextForThisThreadImpl();
}
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