| /*===- InstrProfiling.c - Support library for PGO instrumentation ---------===*\ |
| |* |
| |* The LLVM Compiler Infrastructure |
| |* |
| |* This file is distributed under the University of Illinois Open Source |
| |* License. See LICENSE.TXT for details. |
| |* |
| \*===----------------------------------------------------------------------===*/ |
| |
| #include "InstrProfiling.h" |
| #include <string.h> |
| |
| __attribute__((visibility("hidden"))) |
| uint64_t __llvm_profile_get_magic(void) { |
| /* Magic number to detect file format and endianness. |
| * |
| * Use 255 at one end, since no UTF-8 file can use that character. Avoid 0, |
| * so that utilities, like strings, don't grab it as a string. 129 is also |
| * invalid UTF-8, and high enough to be interesting. |
| * |
| * Use "lprofr" in the centre to stand for "LLVM Profile Raw", or "lprofR" |
| * for 32-bit platforms. |
| */ |
| unsigned char R = sizeof(void *) == sizeof(uint64_t) ? 'r' : 'R'; |
| return |
| (uint64_t)255 << 56 | |
| (uint64_t)'l' << 48 | |
| (uint64_t)'p' << 40 | |
| (uint64_t)'r' << 32 | |
| (uint64_t)'o' << 24 | |
| (uint64_t)'f' << 16 | |
| (uint64_t) R << 8 | |
| (uint64_t)129; |
| } |
| |
| __attribute__((visibility("hidden"))) |
| uint64_t __llvm_profile_get_version(void) { |
| /* This should be bumped any time the output format changes. */ |
| return 1; |
| } |
| |
| __attribute__((visibility("hidden"))) |
| void __llvm_profile_reset_counters(void) { |
| uint64_t *I = __llvm_profile_counters_begin(); |
| uint64_t *E = __llvm_profile_counters_end(); |
| |
| memset(I, 0, sizeof(uint64_t)*(E - I)); |
| } |