1 files changed, 104 insertions, 0 deletions
diff --git a/lib/profile/InstrProfilingBuffer.c b/lib/profile/InstrProfilingBuffer.c
new file mode 100644
index 000000000000..3c429c8a85ea
--- /dev/null
+++ b/lib/profile/InstrProfilingBuffer.c
@@ -0,0 +1,104 @@
+/*===- InstrProfilingBuffer.c - Write instrumentation to a memory buffer --===*\
+|*
+|*                     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 "InstrProfilingInternal.h"
+
+#include <string.h>
+
+__attribute__((visibility("hidden")))
+uint64_t __llvm_profile_get_size_for_buffer(void) {
+  const __llvm_profile_data *DataBegin = __llvm_profile_begin_data();
+  const __llvm_profile_data *DataEnd = __llvm_profile_end_data();
+  const uint64_t *CountersBegin = __llvm_profile_begin_counters();
+  const uint64_t *CountersEnd = __llvm_profile_end_counters();
+  const char *NamesBegin = __llvm_profile_begin_names();
+  const char *NamesEnd = __llvm_profile_end_names();
+
+  return __llvm_profile_get_size_for_buffer_internal(
+      DataBegin, DataEnd, CountersBegin, CountersEnd, NamesBegin, NamesEnd);
+}
+
+#define PROFILE_RANGE_SIZE(Range) (Range##End - Range##Begin)
+
+__attribute__((visibility("hidden")))
+uint64_t __llvm_profile_get_size_for_buffer_internal(
+        const __llvm_profile_data *DataBegin,
+        const __llvm_profile_data *DataEnd, const uint64_t *CountersBegin,
+        const uint64_t *CountersEnd, const char *NamesBegin,
+        const char *NamesEnd) {
+  /* Match logic in __llvm_profile_write_buffer(). */
+  const uint64_t NamesSize = PROFILE_RANGE_SIZE(Names) * sizeof(char);
+  const uint64_t Padding = sizeof(uint64_t) - NamesSize % sizeof(uint64_t);
+  return sizeof(uint64_t) * PROFILE_HEADER_SIZE +
+      PROFILE_RANGE_SIZE(Data) * sizeof(__llvm_profile_data) +
+      PROFILE_RANGE_SIZE(Counters) * sizeof(uint64_t) +
+      NamesSize + Padding;
+}
+
+__attribute__((visibility("hidden")))
+int __llvm_profile_write_buffer(char *Buffer) {
+  /* Match logic in __llvm_profile_get_size_for_buffer().
+   * Match logic in __llvm_profile_write_file().
+   */
+  const __llvm_profile_data *DataBegin = __llvm_profile_begin_data();
+  const __llvm_profile_data *DataEnd = __llvm_profile_end_data();
+  const uint64_t *CountersBegin = __llvm_profile_begin_counters();
+  const uint64_t *CountersEnd   = __llvm_profile_end_counters();
+  const char *NamesBegin = __llvm_profile_begin_names();
+  const char *NamesEnd   = __llvm_profile_end_names();
+
+  return __llvm_profile_write_buffer_internal(Buffer, DataBegin, DataEnd,
+                                              CountersBegin, CountersEnd,
+                                              NamesBegin, NamesEnd);
+}
+
+__attribute__((visibility("hidden")))
+int __llvm_profile_write_buffer_internal(
+    char *Buffer, const __llvm_profile_data *DataBegin,
+    const __llvm_profile_data *DataEnd, const uint64_t *CountersBegin,
+    const uint64_t *CountersEnd, const char *NamesBegin, const char *NamesEnd) {
+  /* Match logic in __llvm_profile_get_size_for_buffer().
+   * Match logic in __llvm_profile_write_file().
+   */
+
+  /* Calculate size of sections. */
+  const uint64_t DataSize = DataEnd - DataBegin;
+  const uint64_t CountersSize = CountersEnd - CountersBegin;
+  const uint64_t NamesSize = NamesEnd - NamesBegin;
+  const uint64_t Padding = sizeof(uint64_t) - NamesSize % sizeof(uint64_t);
+
+  /* Enough zeroes for padding. */
+  const char Zeroes[sizeof(uint64_t)] = {0};
+
+  /* Create the header. */
+  uint64_t Header[PROFILE_HEADER_SIZE];
+  Header[0] = __llvm_profile_get_magic();
+  Header[1] = __llvm_profile_get_version();
+  Header[2] = DataSize;
+  Header[3] = CountersSize;
+  Header[4] = NamesSize;
+  Header[5] = (uintptr_t)CountersBegin;
+  Header[6] = (uintptr_t)NamesBegin;
+
+  /* Write the data. */
+#define UPDATE_memcpy(Data, Size) \
+  do {                            \
+    memcpy(Buffer, Data, Size);   \
+    Buffer += Size;               \
+  } while (0)
+  UPDATE_memcpy(Header,  PROFILE_HEADER_SIZE * sizeof(uint64_t));
+  UPDATE_memcpy(DataBegin,     DataSize      * sizeof(__llvm_profile_data));
+  UPDATE_memcpy(CountersBegin, CountersSize  * sizeof(uint64_t));
+  UPDATE_memcpy(NamesBegin,    NamesSize     * sizeof(char));
+  UPDATE_memcpy(Zeroes,        Padding       * sizeof(char));
+#undef UPDATE_memcpy
+
+  return 0;
+}