vendor/compiler-rt/compiler-rt-r224034

1 files changed, 48 insertions, 0 deletions

diff --git a/lib/profile/InstrProfiling.c b/lib/profile/InstrProfiling.c
new file mode 100644
index 0000000000000..8d010df28f18b
--- /dev/null
+++ b/lib/profile/InstrProfiling.c
@@ -0,0 +1,48 @@
+/*===- 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_begin_counters();
+  uint64_t *E = __llvm_profile_end_counters();
+
+  memset(I, 0, sizeof(uint64_t)*(E - I));
+}