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Update create_gcov to work with version 2 of AutoFDO file format. #117

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Jul 10, 2021
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Update create_gcov to work with version 2 of AutoFDO file format. #117

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131 changes: 76 additions & 55 deletions gcov.cc
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Original file line number Diff line number Diff line change
Expand Up @@ -36,35 +36,30 @@ const uint32 GCOV_TAG_AFDO_WORKING_SET = 0xaf000000;
const uint32 GCOV_DATA_MAGIC = 0x67636461; /* "gcda" */
const char *GCOV_ELF_SECTION_NAME = ".gnu.switches.text";

#define GCOV_BLOCK_SIZE (1 << 10)
#define GCOV_BLOCK_BYTE_SIZE (1 << 12)

struct gcov_var {
FILE *file;
uint32 start;
uint32 offset;
uint32 length;
uint32 overread;
uint32 byte_offset;
uint32 byte_length;
int32 error;
int32 mode;
uint64 alloc;
uint32 *buffer;
uint64 byte_alloc;
char *buffer;
};

static struct gcov_var gcov_var;

static void gcov_write_block(unsigned size) {
if (fwrite(gcov_var.buffer, size << 2, 1, gcov_var.file) != 1) {
static void gcov_write_block(unsigned byte_size) {
if (fwrite(gcov_var.buffer, byte_size, 1, gcov_var.file) != 1) {
gcov_var.error = 1;
}
gcov_var.start += size;
gcov_var.offset -= size;
gcov_var.byte_offset -= byte_size;
}

int gcov_open(const char *name, int mode) {
CHECK(!gcov_var.file);
gcov_var.start = 0;
gcov_var.offset = gcov_var.length = 0;
gcov_var.overread = -1u;
gcov_var.byte_offset = gcov_var.byte_length = 0;
gcov_var.error = 0;
if (mode >= 0)
gcov_var.file = fopen(name, (mode > 0) ? "rb" : "r+b");
Expand All @@ -88,45 +83,53 @@ int gcov_open(const char *name, int mode) {

int gcov_close(void) {
if (gcov_var.file) {
if (gcov_var.offset && gcov_var.mode < 0) {
gcov_write_block(gcov_var.offset);
if (gcov_var.byte_offset && gcov_var.mode < 0) {
gcov_write_block(gcov_var.byte_offset);
}
fclose(gcov_var.file);
gcov_var.file = 0;
gcov_var.length = 0;
gcov_var.byte_length = 0;
}
gcov_var.mode = 0;
int err = gcov_var.error;
return err;
}

static inline void gcov_allocate(unsigned length) {
uint64 new_size = gcov_var.alloc;
static inline void gcov_allocate(unsigned byte_length) {
uint64 new_byte_size = gcov_var.byte_alloc;

if (!new_size) {
new_size = GCOV_BLOCK_SIZE;
if (!new_byte_size) {
new_byte_size = GCOV_BLOCK_BYTE_SIZE;
}
new_size += length;
new_size *= 2;
new_byte_size += byte_length;
new_byte_size *= 2;

gcov_var.alloc = new_size;
gcov_var.byte_alloc = new_byte_size;
gcov_var.buffer =
static_cast<uint32 *>(realloc(gcov_var.buffer, new_size << 2));
static_cast<char *>(realloc(gcov_var.buffer, new_byte_size));
}

static inline uint32 *gcov_write_words(unsigned words) {
uint32 *result;
static inline char *gcov_write_bytes(unsigned bytes) {
char *result;

CHECK_LT(gcov_var.mode, 0);
if (gcov_var.offset + words > gcov_var.alloc) {
gcov_allocate(gcov_var.offset + words);
if (gcov_var.byte_offset + bytes > gcov_var.byte_alloc) {
gcov_allocate(gcov_var.byte_offset + bytes);
}
result = &gcov_var.buffer[gcov_var.offset];
gcov_var.offset += words;
result = &gcov_var.buffer[gcov_var.byte_offset];
gcov_var.byte_offset += bytes;

return result;
}

static inline uint32 *gcov_write_words(unsigned words) {
uint32 *result;
unsigned bytes = words << 2;

return reinterpret_cast<uint32 *>(gcov_write_bytes(bytes));
}


void gcov_write_unsigned(uint32 value) {
uint32 *buffer = gcov_write_words(1);
buffer[0] = value;
Expand All @@ -146,44 +149,57 @@ void gcov_write_string(const char *string) {

if (string) {
length = strlen(string);
alloc = (length + 4) >> 2;
if (absl::GetFlag(FLAGS_gcov_version) == 2) {
// Length includes the terminating 0 and is saved in bytes.
alloc = length + 1;
char *byte_buffer = gcov_write_bytes(4 + alloc);
byte_buffer[3 + alloc] = 0;
buffer = reinterpret_cast<uint32 *>(byte_buffer);
}
else {
// Length is saved in words and padding is added.
alloc = (length + 4) >> 2;
buffer = gcov_write_words(1 + alloc);
buffer[alloc] = 0;
}
}

buffer = gcov_write_words(1 + alloc);
buffer[0] = alloc;
buffer[alloc] = 0;
memcpy(&buffer[1], string, length);
}

static inline const uint32 *gcov_read_words(unsigned words) {
const uint32 *result;
unsigned excess = gcov_var.length - gcov_var.offset;
static inline const char *gcov_read_bytes(unsigned bytes) {
const char *result;
unsigned excess_bytes = gcov_var.byte_length - gcov_var.byte_offset;

CHECK_GT(gcov_var.mode, 0);
CHECK(words < GCOV_BLOCK_SIZE);
if (excess < words) {
gcov_var.start += gcov_var.offset;
memmove(gcov_var.buffer, gcov_var.buffer + gcov_var.offset, excess * 4);
gcov_var.offset = 0;
gcov_var.length = excess;
if (gcov_var.length + words > gcov_var.alloc) {
gcov_allocate(gcov_var.length + words);
CHECK(bytes < GCOV_BLOCK_BYTE_SIZE);
if (excess_bytes < bytes) {
memmove(gcov_var.buffer, gcov_var.buffer + gcov_var.byte_offset, excess_bytes);
gcov_var.byte_offset = 0;
gcov_var.byte_length = excess_bytes;
if (gcov_var.byte_length + bytes > gcov_var.byte_alloc) {
gcov_allocate(gcov_var.byte_length + bytes);
}
excess = gcov_var.alloc - gcov_var.length;
excess = fread(gcov_var.buffer + gcov_var.length,
1, excess << 2, gcov_var.file) >> 2;
gcov_var.length += excess;
if (gcov_var.length < words) {
gcov_var.overread += words - gcov_var.length;
gcov_var.length = 0;
excess_bytes = gcov_var.byte_alloc - gcov_var.byte_length;
excess_bytes = fread(gcov_var.buffer + gcov_var.byte_length,
1, excess_bytes, gcov_var.file);
gcov_var.byte_length += excess_bytes;
if (gcov_var.byte_length < bytes) {
gcov_var.byte_length = 0;
return 0;
}
}
result = &gcov_var.buffer[gcov_var.offset];
gcov_var.offset += words;
result = &gcov_var.buffer[gcov_var.byte_offset];
gcov_var.byte_offset += bytes;
return result;
}

static inline const uint32 *gcov_read_words(unsigned words) {
unsigned bytes = words << 2;
return reinterpret_cast<const uint32 *>(gcov_read_bytes(bytes));
}

uint32 gcov_read_unsigned(void) {
uint32 value;
const uint32 *buffer = gcov_read_words(1);
Expand Down Expand Up @@ -213,5 +229,10 @@ const char * gcov_read_string(void) {
return 0;
}

return (const char *) gcov_read_words (length);
if (absl::GetFlag(FLAGS_gcov_version) == 2) {
return gcov_read_bytes (length);
}
else {
return (const char *) gcov_read_words (length);
}
}