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📄 weak_symbols.txt(88 B)
📄 xray_AArch64.cpp(4.62 KB)
📄 xray_allocator.h(9.33 KB)
📄 xray_always_instrument.txt(255 B)
📄 xray_arm.cpp(5.87 KB)
📄 xray_basic_flags.cpp(1.52 KB)
📄 xray_basic_flags.h(1.18 KB)
📄 xray_basic_flags.inc(1011 B)
📄 xray_basic_logging.cpp(17.59 KB)
📄 xray_basic_logging.h(1.68 KB)
📄 xray_buffer_queue.cpp(7.35 KB)
📄 xray_buffer_queue.h(8.79 KB)
📄 xray_defs.h(967 B)
📄 xray_fdr_controller.h(11.79 KB)
📄 xray_fdr_flags.cpp(1.47 KB)
📄 xray_fdr_flags.h(1.2 KB)
📄 xray_fdr_flags.inc(1.28 KB)
📄 xray_fdr_log_records.h(2.5 KB)
📄 xray_fdr_log_writer.h(8.72 KB)
📄 xray_fdr_logging.cpp(27.62 KB)
📄 xray_fdr_logging.h(1.53 KB)
📄 xray_flags.cpp(2.76 KB)
📄 xray_flags.h(1.12 KB)
📄 xray_flags.inc(2.29 KB)
📄 xray_function_call_trie.h(22.36 KB)
📄 xray_init.cpp(4.6 KB)
📄 xray_interface.cpp(16.43 KB)
📄 xray_interface_internal.h(3.2 KB)
📄 xray_log_interface.cpp(7.53 KB)
📄 xray_mips.cpp(7.16 KB)
📄 xray_mips64.cpp(7.66 KB)
📄 xray_never_instrument.txt(282 B)
📄 xray_powerpc64.cpp(3.63 KB)
📄 xray_powerpc64.inc(1019 B)
📄 xray_profile_collector.cpp(14.06 KB)
📄 xray_profile_collector.h(2.73 KB)
📄 xray_profiling.cpp(17.55 KB)
📄 xray_profiling_flags.cpp(1.34 KB)
📄 xray_profiling_flags.h(1.17 KB)
📄 xray_profiling_flags.inc(1.4 KB)
📄 xray_recursion_guard.h(1.8 KB)
📄 xray_segmented_array.h(21.22 KB)
📄 xray_trampoline_AArch64.S(6.1 KB)
📄 xray_trampoline_arm.S(3.85 KB)
📄 xray_trampoline_mips.S(2.67 KB)
📄 xray_trampoline_mips64.S(3.47 KB)
📄 xray_trampoline_powerpc64.cpp(420 B)
📄 xray_trampoline_powerpc64_asm.S(3.91 KB)
📄 xray_trampoline_x86_64.S(7.06 KB)
📄 xray_tsc.h(2.75 KB)
📄 xray_utils.cpp(6.04 KB)
📄 xray_utils.h(2.18 KB)
📄 xray_x86_64.cpp(11.73 KB)
📄 xray_x86_64.inc(997 B)

Editing: xray_init.cpp

//===-- xray_init.cpp -------------------------------------------*- 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
//
//===----------------------------------------------------------------------===//
//
// This file is a part of XRay, a dynamic runtime instrumentation system.
//
// XRay initialisation logic.
//===----------------------------------------------------------------------===//

#include <fcntl.h>
#include <strings.h>
#include <unistd.h>

#include "sanitizer_common/sanitizer_common.h"
#include "xray_defs.h"
#include "xray_flags.h"
#include "xray_interface_internal.h"

extern "C" {
void __xray_init();
extern const XRaySledEntry __start_xray_instr_map[] __attribute__((weak));
extern const XRaySledEntry __stop_xray_instr_map[] __attribute__((weak));
extern const XRayFunctionSledIndex __start_xray_fn_idx[] __attribute__((weak));
extern const XRayFunctionSledIndex __stop_xray_fn_idx[] __attribute__((weak));

#if SANITIZER_MAC
// HACK: This is a temporary workaround to make XRay build on 
// Darwin, but it will probably not work at runtime.
const XRaySledEntry __start_xray_instr_map[] = {};
extern const XRaySledEntry __stop_xray_instr_map[] = {};
extern const XRayFunctionSledIndex __start_xray_fn_idx[] = {};
extern const XRayFunctionSledIndex __stop_xray_fn_idx[] = {};
#endif
}

using namespace __xray;

// When set to 'true' this means the XRay runtime has been initialised. We use
// the weak symbols defined above (__start_xray_inst_map and
// __stop_xray_instr_map) to initialise the instrumentation map that XRay uses
// for runtime patching/unpatching of instrumentation points.
//
// FIXME: Support DSO instrumentation maps too. The current solution only works
// for statically linked executables.
atomic_uint8_t XRayInitialized{0};

// This should always be updated before XRayInitialized is updated.
SpinMutex XRayInstrMapMutex;
XRaySledMap XRayInstrMap;

// Global flag to determine whether the flags have been initialized.
atomic_uint8_t XRayFlagsInitialized{0};

// A mutex to allow only one thread to initialize the XRay data structures.
SpinMutex XRayInitMutex;

// __xray_init() will do the actual loading of the current process' memory map
// and then proceed to look for the .xray_instr_map section/segment.
void __xray_init() XRAY_NEVER_INSTRUMENT {
  SpinMutexLock Guard(&XRayInitMutex);
  // Short-circuit if we've already initialized XRay before.
  if (atomic_load(&XRayInitialized, memory_order_acquire))
    return;

// XRAY is not compatible with PaX MPROTECT
  CheckMPROTECT();

if (!atomic_load(&XRayFlagsInitialized, memory_order_acquire)) {
    initializeFlags();
    atomic_store(&XRayFlagsInitialized, true, memory_order_release);
  }

if (__start_xray_instr_map == nullptr) {
    if (Verbosity())
      Report("XRay instrumentation map missing. Not initializing XRay.\n");
    return;
  }

{
    SpinMutexLock Guard(&XRayInstrMapMutex);
    XRayInstrMap.Sleds = __start_xray_instr_map;
    XRayInstrMap.Entries = __stop_xray_instr_map - __start_xray_instr_map;
    if (__start_xray_fn_idx != nullptr) {
      XRayInstrMap.SledsIndex = __start_xray_fn_idx;
      XRayInstrMap.Functions = __stop_xray_fn_idx - __start_xray_fn_idx;
    } else {
      size_t CountFunctions = 0;
      uint64_t LastFnAddr = 0;

for (std::size_t I = 0; I < XRayInstrMap.Entries; I++) {
        const auto &Sled = XRayInstrMap.Sleds[I];
        const auto Function = Sled.function();
        if (Function != LastFnAddr) {
          CountFunctions++;
          LastFnAddr = Function;
        }
      }

XRayInstrMap.Functions = CountFunctions;
    }
  }
  atomic_store(&XRayInitialized, true, memory_order_release);

#ifndef XRAY_NO_PREINIT
  if (flags()->patch_premain)
    __xray_patch();
#endif
}

// FIXME: Make check-xray tests work on FreeBSD without
// SANITIZER_CAN_USE_PREINIT_ARRAY.
// See sanitizer_internal_defs.h where the macro is defined.
// Calling unresolved PLT functions in .preinit_array can lead to deadlock on
// FreeBSD but here it seems benign.
#if !defined(XRAY_NO_PREINIT) &&                                               \
    (SANITIZER_CAN_USE_PREINIT_ARRAY || SANITIZER_FREEBSD)
// Only add the preinit array initialization if the sanitizers can.
__attribute__((section(".preinit_array"),
               used)) void (*__local_xray_preinit)(void) = __xray_init;
#else
// If we cannot use the .preinit_array section, we should instead use dynamic
// initialisation.
__attribute__ ((constructor (0)))
static void __local_xray_dyninit() {
  __xray_init();
}
#endif

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Editing: xray_init.cpp

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