compiler-rt/lib/profile/InstrProfilingPlatformOther.c

/*===- InstrProfilingPlatformOther.c - Profile data default platform ------===*\
|*
|* 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 defines a fallback implementation to compute the locations of
// profile data sections, for targets that don't have linker support.  No
// commonly used targets use this codepath.
//
// This implementation expects the compiler instrumentation pass to define a
// constructor in each file which calls into this file.

#if (!defined(__APPLE__) && !defined(__linux__) && !defined(__FreeBSD__) &&    \
     !defined(__Fuchsia__) && !(defined(__sun__) && defined(__svr4__)) &&      \
     !defined(__NetBSD__) && !defined(_WIN32) && !defined(_AIX) &&             \
     !defined(__wasm__) && !defined(__HAIKU__) &&                              \
     !defined(COMPILER_RT_PROFILE_BAREMETAL)) ||                               \
    defined(__NVPTX__)

#include "InstrProfiling.h"
#include "InstrProfilingInternal.h"

#if defined(__NVPTX__)
extern __llvm_profile_gpu_sections INSTR_PROF_SECT_BOUNDS_TABLE;
#define DataFirst INSTR_PROF_SECT_BOUNDS_TABLE.DataStart
#define DataLast INSTR_PROF_SECT_BOUNDS_TABLE.DataStop
#define NamesFirst INSTR_PROF_SECT_BOUNDS_TABLE.NamesStart
#define NamesLast INSTR_PROF_SECT_BOUNDS_TABLE.NamesStop
#define CountersFirst INSTR_PROF_SECT_BOUNDS_TABLE.CountersStart
#define CountersLast INSTR_PROF_SECT_BOUNDS_TABLE.CountersStop
#else
static const __llvm_profile_data *DataFirst = NULL;
static const __llvm_profile_data *DataLast = NULL;
static const char *NamesFirst = NULL;
static const char *NamesLast = NULL;
static char *CountersFirst = NULL;
static char *CountersLast = NULL;
#endif
static const VTableProfData *VTableProfDataFirst = NULL;
static const VTableProfData *VTableProfDataLast = NULL;
static const char *VNamesFirst = NULL;
static const char *VNamesLast = NULL;
static char *BitmapFirst = NULL;
static char *BitmapLast = NULL;

static const void *getMinAddr(const void *A1, const void *A2) {
  return A1 < A2 ? A1 : A2;
}

static const void *getMaxAddr(const void *A1, const void *A2) {
  return A1 > A2 ? A1 : A2;
}

/*!
 * \brief Register an instrumented function.
 *
 * Calls to this are emitted by clang with -fprofile-instr-generate.  Such
 * calls are only required (and only emitted) on targets where we haven't
 * implemented linker magic to find the bounds of the sections.
 */
COMPILER_RT_VISIBILITY
void __llvm_profile_register_function(void *Data_) {
  /* TODO: Only emit this function if we can't use linker magic. */
  const __llvm_profile_data *Data = (__llvm_profile_data *)Data_;

#if defined(__NVPTX__)
  // NVPTX stores absolute counter addresses to avoid circular dependencies in
  // PTX global variable initializers. Convert to a relative offset so the
  // host-side profile reader sees the standard format.
  {
    uintptr_t Rel = (uintptr_t)Data->CounterPtr - (uintptr_t)Data_;
    __builtin_memcpy((char *)Data_ +
                         __builtin_offsetof(__llvm_profile_data, CounterPtr),
                     &Rel, sizeof(Rel));
  }
#endif

  if (!DataFirst) {
    DataFirst = Data;
    DataLast = Data + 1;
    CountersFirst = (char *)((uintptr_t)Data_ + Data->CounterPtr);
    CountersLast =
        CountersFirst + Data->NumCounters * __llvm_profile_counter_entry_size();
    return;
  }

  DataFirst = (const __llvm_profile_data *)getMinAddr(DataFirst, Data);
  CountersFirst = (char *)getMinAddr(
      CountersFirst, (char *)((uintptr_t)Data_ + Data->CounterPtr));

  DataLast = (const __llvm_profile_data *)getMaxAddr(DataLast, Data + 1);
  CountersLast = (char *)getMaxAddr(
      CountersLast,
      (char *)((uintptr_t)Data_ + Data->CounterPtr) +
          Data->NumCounters * __llvm_profile_counter_entry_size());
}

COMPILER_RT_VISIBILITY
void __llvm_profile_register_names_function(void *NamesStart,
                                            uint64_t NamesSize) {
  if (!NamesFirst) {
    NamesFirst = (const char *)NamesStart;
    NamesLast = (const char *)NamesStart + NamesSize;
    return;
  }
  NamesFirst = (const char *)getMinAddr(NamesFirst, NamesStart);
  NamesLast =
      (const char *)getMaxAddr(NamesLast, (const char *)NamesStart + NamesSize);
}

COMPILER_RT_VISIBILITY
const __llvm_profile_data *__llvm_profile_begin_data(void) { return DataFirst; }
COMPILER_RT_VISIBILITY
const __llvm_profile_data *__llvm_profile_end_data(void) { return DataLast; }
COMPILER_RT_VISIBILITY const VTableProfData *
__llvm_profile_begin_vtables(void) {
  return VTableProfDataFirst;
}
COMPILER_RT_VISIBILITY const VTableProfData *__llvm_profile_end_vtables(void) {
  return VTableProfDataLast;
}
COMPILER_RT_VISIBILITY
const char *__llvm_profile_begin_names(void) { return NamesFirst; }
COMPILER_RT_VISIBILITY
const char *__llvm_profile_end_names(void) { return NamesLast; }
COMPILER_RT_VISIBILITY
const char *__llvm_profile_begin_vtabnames(void) { return VNamesFirst; }
COMPILER_RT_VISIBILITY
const char *__llvm_profile_end_vtabnames(void) { return VNamesLast; }
COMPILER_RT_VISIBILITY
char *__llvm_profile_begin_counters(void) { return CountersFirst; }
COMPILER_RT_VISIBILITY
char *__llvm_profile_end_counters(void) { return CountersLast; }
COMPILER_RT_VISIBILITY
char *__llvm_profile_begin_bitmap(void) { return BitmapFirst; }
COMPILER_RT_VISIBILITY
char *__llvm_profile_end_bitmap(void) { return BitmapLast; }

COMPILER_RT_VISIBILITY
ValueProfNode *__llvm_profile_begin_vnodes(void) {
  return 0;
}
COMPILER_RT_VISIBILITY
ValueProfNode *__llvm_profile_end_vnodes(void) { return 0; }

COMPILER_RT_VISIBILITY ValueProfNode *CurrentVNode = 0;
COMPILER_RT_VISIBILITY ValueProfNode *EndVNode = 0;

COMPILER_RT_VISIBILITY int __llvm_write_binary_ids(ProfDataWriter *Writer) {
  return 0;
}

#endif