derek.holloway
7502bf64a4
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63 lines
2.4 KiB
C++
63 lines
2.4 KiB
C++
//===-- xray_init.cpp -------------------------------------------*- C++ -*-===//
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//
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// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
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// See https://llvm.org/LICENSE.txt for license information.
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// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
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//
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//===----------------------------------------------------------------------===//
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//
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// This file is a part of XRay, a dynamic runtime instrumentation system.
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//
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// XRay initialisation logic for DSOs.
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//===----------------------------------------------------------------------===//
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#include "sanitizer_common/sanitizer_atomic.h"
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#include "xray_defs.h"
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#include "xray_flags.h"
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#include "xray_interface_internal.h"
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using namespace __sanitizer;
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extern "C" {
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extern const XRaySledEntry __start_xray_instr_map[] __attribute__((weak))
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__attribute__((visibility("hidden")));
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extern const XRaySledEntry __stop_xray_instr_map[] __attribute__((weak))
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__attribute__((visibility("hidden")));
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extern const XRayFunctionSledIndex __start_xray_fn_idx[] __attribute__((weak))
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__attribute__((visibility("hidden")));
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extern const XRayFunctionSledIndex __stop_xray_fn_idx[] __attribute__((weak))
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__attribute__((visibility("hidden")));
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#if SANITIZER_APPLE
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// HACK: This is a temporary workaround to make XRay build on
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// Darwin, but it will probably not work at runtime.
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extern const XRaySledEntry __start_xray_instr_map[] = {};
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extern const XRaySledEntry __stop_xray_instr_map[] = {};
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extern const XRayFunctionSledIndex __start_xray_fn_idx[] = {};
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extern const XRayFunctionSledIndex __stop_xray_fn_idx[] = {};
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#endif
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}
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// Handler functions to call in the patched entry/exit sled.
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extern atomic_uintptr_t XRayPatchedFunction;
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extern atomic_uintptr_t XRayArgLogger;
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extern atomic_uintptr_t XRayPatchedCustomEvent;
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extern atomic_uintptr_t XRayPatchedTypedEvent;
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static int __xray_object_id{-1};
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// Note: .preinit_array initialization does not work for DSOs
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__attribute__((constructor(0))) static void
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__xray_init_dso() XRAY_NEVER_INSTRUMENT {
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// Register sleds in main XRay runtime.
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__xray_object_id =
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__xray_register_dso(__start_xray_instr_map, __stop_xray_instr_map,
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__start_xray_fn_idx, __stop_xray_fn_idx, {});
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}
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__attribute__((destructor(0))) static void
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__xray_finalize_dso() XRAY_NEVER_INSTRUMENT {
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// Inform the main runtime that this DSO is no longer used.
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__xray_deregister_dso(__xray_object_id);
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}
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