1 files changed, 10 insertions, 6 deletions

diff --git a/compiler-rt/lib/profile/InstrProfilingBuffer.c b/compiler-rt/lib/profile/InstrProfilingBuffer.c
index 2d91961a616..250e2214359 100644
--- a/compiler-rt/lib/profile/InstrProfilingBuffer.c
+++ b/compiler-rt/lib/profile/InstrProfilingBuffer.c
@@ -11,13 +11,17 @@
 #include <string.h>
 
 uint64_t __llvm_profile_get_size_for_buffer(void) {
-  return sizeof(uint64_t) * 7 +
+  /* Match logic in __llvm_profile_write_buffer(). */
+  return sizeof(uint64_t) * PROFILE_HEADER_SIZE +
      PROFILE_RANGE_SIZE(data) * sizeof(__llvm_profile_data) +
      PROFILE_RANGE_SIZE(counters) * sizeof(uint64_t) +
      PROFILE_RANGE_SIZE(names) * sizeof(char);
 }
 
 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_data_begin();
   const __llvm_profile_data *DataEnd = __llvm_profile_data_end();
   const uint64_t *CountersBegin = __llvm_profile_counters_begin();
@@ -31,7 +35,7 @@ int __llvm_profile_write_buffer(char *Buffer) {
   const uint64_t NamesSize = NamesEnd - NamesBegin;
 
   /* Create the header. */
-  uint64_t Header[] = {
+  uint64_t Header[PROFILE_HEADER_SIZE] = {
     __llvm_profile_get_magic(),
     __llvm_profile_get_version(),
     DataSize,
@@ -47,10 +51,10 @@ int __llvm_profile_write_buffer(char *Buffer) {
     memcpy(Buffer, Data, Size);   \
     Buffer += Size;               \
   } while (0)
-  UPDATE_memcpy(Header,        sizeof(Header));
-  UPDATE_memcpy(DataBegin,     DataSize     * sizeof(__llvm_profile_data));
-  UPDATE_memcpy(CountersBegin, CountersSize * sizeof(uint64_t));
-  UPDATE_memcpy(NamesBegin,    NamesSize    * sizeof(char));
+  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));
 #undef UPDATE_memcpy
 
   return 0;