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mmapForContinuousMode: Align Linux's impl to __APPLE__'s more. NFC. #95702

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Jun 20, 2024
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30 changes: 26 additions & 4 deletions compiler-rt/lib/profile/InstrProfilingFile.c
Original file line number Diff line number Diff line change
@@ -237,24 +237,46 @@ static int mmapForContinuousMode(uint64_t CurrentFileOffset, FILE *File) {
const char *CountersEnd = __llvm_profile_end_counters();
const char *BitmapBegin = __llvm_profile_begin_bitmap();
const char *BitmapEnd = __llvm_profile_end_bitmap();
const char *NamesBegin = __llvm_profile_begin_names();
const char *NamesEnd = __llvm_profile_end_names();
const uint64_t NamesSize = (NamesEnd - NamesBegin) * sizeof(char);
uint64_t DataSize = __llvm_profile_get_data_size(DataBegin, DataEnd);
uint64_t CountersSize =
__llvm_profile_get_counters_size(CountersBegin, CountersEnd);
uint64_t NumBitmapBytes =
__llvm_profile_get_num_bitmap_bytes(BitmapBegin, BitmapEnd);
/* Get the file size. */
uint64_t FileSize = 0;
if (getProfileFileSizeForMerging(File, &FileSize))
return 1;

int Fileno = fileno(File);
/* Determine how much padding is needed before/after the counters and
* after the names. */
uint64_t PaddingBytesBeforeCounters, PaddingBytesAfterCounters,
PaddingBytesAfterNames, PaddingBytesAfterBitmapBytes,
PaddingBytesAfterVTable, PaddingBytesAfterVNames;
__llvm_profile_get_padding_sizes_for_counters(
DataSize, CountersSize, NumBitmapBytes, NamesSize, /*VTableSize=*/0,
/*VNameSize=*/0, &PaddingBytesBeforeCounters, &PaddingBytesAfterCounters,
&PaddingBytesAfterBitmapBytes, &PaddingBytesAfterNames,
&PaddingBytesAfterVTable, &PaddingBytesAfterVNames);

CurrentFileOffset = 0;
uint64_t FileOffsetToCounters = CurrentFileOffset +
sizeof(__llvm_profile_header) + DataSize +
PaddingBytesBeforeCounters;

/* Map the profile. */
char *Profile = (char *)mmap(NULL, FileSize, PROT_READ | PROT_WRITE,
MAP_SHARED, fileno(File), 0);
MAP_SHARED, Fileno, 0);
if (Profile == MAP_FAILED) {
PROF_ERR("Unable to mmap profile: %s\n", strerror(errno));
return 1;
}
const uint64_t CountersOffsetInBiasMode =
sizeof(__llvm_profile_header) + __llvm_write_binary_ids(NULL) + DataSize;
/* Update the profile fields based on the current mapping. */
INSTR_PROF_PROFILE_COUNTER_BIAS_VAR =
(intptr_t)Profile - (uintptr_t)CountersBegin + CountersOffsetInBiasMode;
(intptr_t)Profile - (uintptr_t)CountersBegin + FileOffsetToCounters;

/* Return the memory allocated for counters to OS. */
lprofReleaseMemoryPagesToOS((uintptr_t)CountersBegin, (uintptr_t)CountersEnd);