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From: William Schmidt <wschmidt@gcc.gnu.org> To: gcc-cvs@gcc.gnu.org Subject: [gcc(refs/users/wschmidt/heads/builtins3)] rs6000: Add helper functions for parsing Date: Fri, 17 Jul 2020 17:21:41 +0000 (GMT) [thread overview] Message-ID: <20200717172141.F2123393B04F@sourceware.org> (raw) https://gcc.gnu.org/g:2fa5ff130eecab50e777a190abc89f293b37eb3e commit 2fa5ff130eecab50e777a190abc89f293b37eb3e Author: Bill Schmidt <wschmidt@linux.ibm.com> Date: Wed Jun 17 09:59:19 2020 -0500 rs6000: Add helper functions for parsing 2020-06-17 Bill Schmidt <wschmidt@linux.ibm.com> * config/rs6000/rs6000-gen-builtins.c (MININT): New defined constant. (exit_codes): New enum. (consume_whitespace): New function. (advance_line): Likewise. (safe_inc_pos): Likewise. (match_identifier): Likewise. (match_integer): Likewise. (match_to_right_bracket): Likewise. Diff: --- gcc/config/rs6000/rs6000-gen-builtins.c | 121 ++++++++++++++++++++++++++++++++ 1 file changed, 121 insertions(+) diff --git a/gcc/config/rs6000/rs6000-gen-builtins.c b/gcc/config/rs6000/rs6000-gen-builtins.c index db7afa31f87..6b38a7f6101 100644 --- a/gcc/config/rs6000/rs6000-gen-builtins.c +++ b/gcc/config/rs6000/rs6000-gen-builtins.c @@ -141,6 +141,10 @@ along with GCC; see the file COPYING3. If not see #include <assert.h> #include <unistd.h> +/* Used as a sentinel for range constraints on integer fields. No field can + be 32 bits wide, so this is a safe sentinel value. */ +#define MININT INT32_MIN + /* Input and output file descriptors and pathnames. */ static FILE *bif_file; static FILE *ovld_file; @@ -163,6 +167,11 @@ static char linebuf[LINELEN]; static int line; static int pos; +/* Exit codes for the shell. */ +enum exit_codes { + EC_INTERR +}; + /* Pointer to a diagnostic function. */ void (*diag) (const char *, ...) __attribute__ ((format (printf, 1, 2))) = NULL; @@ -188,3 +197,115 @@ ovld_diag (const char * fmt, ...) va_end (args); } +/* Pass over unprintable characters and whitespace (other than a newline, + which terminates the scan). */ +static void +consume_whitespace () +{ + while (pos < LINELEN && isspace(linebuf[pos]) && linebuf[pos] != '\n') + pos++; + return; +} + +/* Get the next nonblank, noncomment line, returning 0 on EOF, 1 otherwise. */ +static int +advance_line (FILE *file) +{ + while (1) + { + /* Read ahead one line and check for EOF. */ + if (!fgets (linebuf, sizeof(linebuf), file)) + return 0; + line++; + pos = 0; + consume_whitespace (); + if (linebuf[pos] != '\n' && linebuf[pos] != ';') + return 1; + } +} + +static inline void +safe_inc_pos () +{ + if (pos++ >= LINELEN) + { + (*diag) ("line length overrun.\n"); + exit (EC_INTERR); + } +} + +/* Match an identifier, returning NULL on failure, else a pointer to a + buffer containing the identifier. */ +static char * +match_identifier () +{ + int lastpos = pos - 1; + while (isalnum (linebuf[lastpos + 1]) || linebuf[lastpos + 1] == '_') + if (++lastpos >= LINELEN - 1) + { + (*diag) ("line length overrun.\n"); + exit (EC_INTERR); + } + + if (lastpos < pos) + return 0; + + char *buf = (char *) malloc (lastpos - pos + 2); + memcpy (buf, &linebuf[pos], lastpos - pos + 1); + buf[lastpos - pos + 1] = '\0'; + + pos = lastpos + 1; + return buf; +} + +/* Match an integer and return its value, or MININT on failure. */ +static int +match_integer () +{ + int startpos = pos; + if (linebuf[pos] == '-') + safe_inc_pos (); + + int lastpos = pos - 1; + while (isdigit (linebuf[lastpos + 1])) + if (++lastpos >= LINELEN - 1) + { + (*diag) ("line length overrun in match_integer.\n"); + exit (EC_INTERR); + } + + if (lastpos < pos) + return MININT; + + pos = lastpos + 1; + char *buf = (char *) malloc (lastpos - startpos + 2); + memcpy (buf, &linebuf[startpos], lastpos - startpos + 1); + buf[lastpos - startpos + 1] = '\0'; + + int x; + sscanf (buf, "%d", &x); + return x; +} + +static char * +match_to_right_bracket () +{ + int lastpos = pos - 1; + while (linebuf[lastpos + 1] != ']') + if (++lastpos >= LINELEN - 1) + { + (*diag) ("line length overrun.\n"); + exit (EC_INTERR); + } + + if (lastpos < pos) + return 0; + + char *buf = (char *) malloc (lastpos - pos + 2); + memcpy (buf, &linebuf[pos], lastpos - pos + 1); + buf[lastpos - pos + 1] = '\0'; + + pos = lastpos + 1; + return buf; +} +
next reply other threads:[~2020-07-17 17:21 UTC|newest] Thread overview: 10+ messages / expand[flat|nested] mbox.gz Atom feed top 2020-07-17 17:21 William Schmidt [this message] -- strict thread matches above, loose matches on Subject: below -- 2020-10-29 19:49 William Schmidt 2020-10-27 16:27 William Schmidt 2020-09-16 21:28 William Schmidt 2020-09-14 13:57 William Schmidt 2020-08-28 20:06 William Schmidt 2020-08-20 16:37 William Schmidt 2020-08-18 18:43 William Schmidt 2020-07-27 18:46 William Schmidt 2020-06-17 20:04 William Schmidt
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