compiler-rt/lib/memprof/memprof_linux.cpp

   1 //===-- memprof_linux.cpp ------------------------------------------------===//
   2 //
   3 // Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
   4 // See https://llvm.org/LICENSE.txt for license information.
   5 // SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
   6 //
   7 //===----------------------------------------------------------------------===//
   8 //
   9 // This file is a part of MemProfiler, a memory profiler.
  10 //
  11 // Linux-specific details.
  12 //===----------------------------------------------------------------------===//
  13
  14 #include "sanitizer_common/sanitizer_platform.h"
  15 #if !SANITIZER_LINUX
  16 #error Unsupported OS
  17 #endif
  18
  19 #include "memprof_interceptors.h"
  20 #include "memprof_internal.h"
  21 #include "memprof_thread.h"
  22 #include "sanitizer_common/sanitizer_flags.h"
  23 #include "sanitizer_common/sanitizer_freebsd.h"
  24 #include "sanitizer_common/sanitizer_libc.h"
  25 #include "sanitizer_common/sanitizer_procmaps.h"
  26
  27 #include <dlfcn.h>
  28 #include <fcntl.h>
  29 #include <limits.h>
  30 #include <link.h>
  31 #include <pthread.h>
  32 #include <stdio.h>
  33 #include <sys/mman.h>
  34 #include <sys/resource.h>
  35 #include <sys/syscall.h>
  36 #include <sys/time.h>
  37 #include <sys/types.h>
  38 #include <sys/ucontext.h>
  39 #include <unistd.h>
  40 #include <unwind.h>
  41
  42 extern ElfW(Dyn) _DYNAMIC[];
  43
  44 typedef enum {
  45   MEMPROF_RT_VERSION_UNDEFINED = 0,
  46   MEMPROF_RT_VERSION_DYNAMIC,
  47   MEMPROF_RT_VERSION_STATIC,
  48 } memprof_rt_version_t;
  49
  50 // FIXME: perhaps also store abi version here?
  51 extern "C" {
  52 SANITIZER_INTERFACE_ATTRIBUTE
  53 memprof_rt_version_t __memprof_rt_version;
  54 }
  55
  56 namespace __memprof {
  57
  58 void InitializePlatformInterceptors() {}
  59 void InitializePlatformExceptionHandlers() {}
  60
  61 void *MemprofDoesNotSupportStaticLinkage() {
  62   // This will fail to link with -static.
  63   return &_DYNAMIC;
  64 }
  65
  66 uptr FindDynamicShadowStart() {
  67   uptr shadow_size_bytes = MemToShadowSize(kHighMemEnd);
  68   return MapDynamicShadow(shadow_size_bytes, SHADOW_SCALE,
  69                           /*min_shadow_base_alignment*/ 0, kHighMemEnd);
  70 }
  71
  72 void *MemprofDlSymNext(const char *sym) { return dlsym(RTLD_NEXT, sym); }
  73
  74 } // namespace __memprof