2021-06-07 Bill Schmidt <wschm...@linux.ibm.com>
gcc/
* config/rs6000/rs6000-gen-builtins.c (consume_whitespace): New
function.
(advance_line): Likewise.
(safe_inc_pos): Likewise.
(match_identifier): Likewise.
(match_integer): Likewise.
(match_to_right_bracket): Likewise.
---
gcc/config/rs6000/rs6000-gen-builtins.c | 111 ++++++++++++++++++++++++
1 file changed, 111 insertions(+)
diff --git a/gcc/config/rs6000/rs6000-gen-builtins.c
b/gcc/config/rs6000/rs6000-gen-builtins.c
index 3c53c3401b2..c5d5590e865 100644
--- a/gcc/config/rs6000/rs6000-gen-builtins.c
+++ b/gcc/config/rs6000/rs6000-gen-builtins.c
@@ -210,3 +210,114 @@ ovld_diag (const char * fmt, ...)
vfprintf (stderr, fmt, args);
va_end (args);
}
+
+/* Pass over unprintable characters and whitespace (other than a newline,
+ which terminates the scan). */
+static void
+consume_whitespace (void)
+{
+ 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++;
+ size_t len = strlen (linebuf);
+ if (linebuf[len - 1] != '\n')
+ (*diag) ("line doesn't terminate with newline\n");
+ pos = 0;
+ consume_whitespace ();
+ if (linebuf[pos] != '\n' && linebuf[pos] != ';')
+ return 1;
+ }
+}
+
+static inline void
+safe_inc_pos (void)
+{
+ if (pos++ >= LINELEN)
+ {
+ (*diag) ("line length overrun.\n");
+ exit (1);
+ }
+}
+
+/* Match an identifier, returning NULL on failure, else a pointer to a
+ buffer containing the identifier. */
+static char *
+match_identifier (void)
+{
+ int lastpos = pos - 1;
+ while (isalnum (linebuf[lastpos + 1]) || linebuf[lastpos + 1] == '_')
+ ++lastpos;
+
+ 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 the string representing its value,
+ or a null string on failure. */
+static char *
+match_integer (void)
+{
+ int startpos = pos;
+ if (linebuf[pos] == '-')
+ safe_inc_pos ();
+
+ int lastpos = pos - 1;
+ while (isdigit (linebuf[lastpos + 1]))
+ ++lastpos;
+
+ if (lastpos < pos)
+ return NULL;
+
+ pos = lastpos + 1;
+ char *buf = (char *) malloc (lastpos - startpos + 2);
+ memcpy (buf, &linebuf[startpos], lastpos - startpos + 1);
+ buf[lastpos - startpos + 1] = '\0';
+ return buf;
+}
+
+/* Match a string up to but not including a ']', and return its value,
+ or zero if there is nothing before the ']'. Error if we don't find
+ such a character. */
+static const char *
+match_to_right_bracket (void)
+{
+ int lastpos = pos - 1;
+ while (linebuf[lastpos + 1] != ']')
+ {
+ if (linebuf[lastpos + 1] == '\n')
+ {
+ (*diag) ("no ']' found before end of line.\n");
+ exit (1);
+ }
+ ++lastpos;
+ }
+
+ 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;
+}
--
2.27.0
