diff options
Diffstat (limited to 'gcc/gcov-io.c')
| -rw-r--r-- | gcc/gcov-io.c | 55 |
1 files changed, 55 insertions, 0 deletions
diff --git a/gcc/gcov-io.c b/gcc/gcov-io.c index ef5120a..b710f59 100644 --- a/gcc/gcov-io.c +++ b/gcc/gcov-io.c @@ -36,6 +36,61 @@ static const gcov_unsigned_t *gcov_read_words (unsigned); static void gcov_allocate (unsigned); #endif +/* Optimum number of gcov_unsigned_t's read from or written to disk. */ +#define GCOV_BLOCK_SIZE (1 << 10) + +GCOV_LINKAGE struct gcov_var +{ + FILE *file; + gcov_position_t start; /* Position of first byte of block */ + unsigned offset; /* Read/write position within the block. */ + unsigned length; /* Read limit in the block. */ + unsigned overread; /* Number of words overread. */ + int error; /* < 0 overflow, > 0 disk error. */ + int mode; /* < 0 writing, > 0 reading */ +#if IN_LIBGCOV + /* Holds one block plus 4 bytes, thus all coverage reads & writes + fit within this buffer and we always can transfer GCOV_BLOCK_SIZE + to and from the disk. libgcov never backtracks and only writes 4 + or 8 byte objects. */ + gcov_unsigned_t buffer[GCOV_BLOCK_SIZE + 1]; +#else + int endian; /* Swap endianness. */ + /* Holds a variable length block, as the compiler can write + strings and needs to backtrack. */ + size_t alloc; + gcov_unsigned_t *buffer; +#endif +} gcov_var; + +/* Save the current position in the gcov file. */ +static inline gcov_position_t +gcov_position (void) +{ + gcc_assert (gcov_var.mode > 0); + return gcov_var.start + gcov_var.offset; +} + +/* Return nonzero if the error flag is set. */ +static inline int +gcov_is_error (void) +{ + return gcov_var.file ? gcov_var.error : 1; +} + +#if IN_LIBGCOV +/* Move to beginning of file and initialize for writing. */ +GCOV_LINKAGE inline void +gcov_rewrite (void) +{ + gcc_assert (gcov_var.mode > 0); + gcov_var.mode = -1; + gcov_var.start = 0; + gcov_var.offset = 0; + fseek (gcov_var.file, 0L, SEEK_SET); +} +#endif + static inline gcov_unsigned_t from_file (gcov_unsigned_t value) { #if !IN_LIBGCOV |