freebsd-dev/contrib/gcc/pretty-print.c
2006-08-26 21:29:10 +00:00

549 lines
15 KiB
C

/* Various declarations for language-independent pretty-print subroutines.
Copyright (C) 2003 Free Software Foundation, Inc.
Contributed by Gabriel Dos Reis <gdr@integrable-solutions.net>
This file is part of GCC.
GCC is free software; you can redistribute it and/or modify it under
the terms of the GNU General Public License as published by the Free
Software Foundation; either version 2, or (at your option) any later
version.
GCC is distributed in the hope that it will be useful, but WITHOUT ANY
WARRANTY; without even the implied warranty of MERCHANTABILITY or
FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License
for more details.
You should have received a copy of the GNU General Public License
along with GCC; see the file COPYING. If not, write to the Free
Software Foundation, 59 Temple Place - Suite 330, Boston, MA
02111-1307, USA. */
#include "config.h"
#undef FLOAT /* This is for hpux. They should change hpux. */
#undef FFS /* Some systems define this in param.h. */
#include "system.h"
#include "coretypes.h"
#include "pretty-print.h"
#define obstack_chunk_alloc xmalloc
#define obstack_chunk_free free
/* A pointer to the formatted diagnostic message. */
#define pp_formatted_text_data(PP) \
((const char *) obstack_base (&pp_base (PP)->buffer->obstack))
/* Format an integer given by va_arg (ARG, type-specifier T) where
type-specifier is a precision modifier as indicated by PREC. F is
a string used to construct the appropriate format-specifier. */
#define pp_integer_with_precision(PP, ARG, PREC, T, F) \
do \
switch (PREC) \
{ \
case 0: \
pp_scalar (PP, "%" F, va_arg (ARG, T)); \
break; \
\
case 1: \
pp_scalar (PP, "%l" F, va_arg (ARG, long T)); \
break; \
\
case 2: \
pp_scalar (PP, "%ll" F, va_arg (ARG, long long T)); \
break; \
\
default: \
break; \
} \
while (0)
/* Subroutine of pp_set_maximum_length. Set up PRETTY-PRINTER's
internal maximum characters per line. */
static void
pp_set_real_maximum_length (pretty_printer *pp)
{
/* If we're told not to wrap lines then do the obvious thing. In case
we'll emit prefix only once per message, it is appropriate
not to increase unnecessarily the line-length cut-off. */
if (!pp_is_wrapping_line (pp)
|| pp_prefixing_rule (pp) == DIAGNOSTICS_SHOW_PREFIX_ONCE
|| pp_prefixing_rule (pp) == DIAGNOSTICS_SHOW_PREFIX_NEVER)
pp->maximum_length = pp_line_cutoff (pp);
else
{
int prefix_length = pp->prefix ? strlen (pp->prefix) : 0;
/* If the prefix is ridiculously too long, output at least
32 characters. */
if (pp_line_cutoff (pp) - prefix_length < 32)
pp->maximum_length = pp_line_cutoff (pp) + 32;
else
pp->maximum_length = pp_line_cutoff (pp);
}
}
/* Clear PRETTY-PRINTER's output state. */
static inline void
pp_clear_state (pretty_printer *pp)
{
pp->emitted_prefix = false;
pp_indentation (pp) = 0;
}
/* Flush the formatted text of PRETTY-PRINTER onto the attached stream. */
static inline void
pp_write_text_to_stream (pretty_printer *pp)
{
const char *text = pp_formatted_text (pp);
fputs (text, pp->buffer->stream);
pp_clear_output_area (pp);
}
/* Wrap a text delimited by START and END into PRETTY-PRINTER. */
static void
pp_wrap_text (pretty_printer *pp, const char *start, const char *end)
{
bool wrapping_line = pp_is_wrapping_line (pp);
while (start != end)
{
/* Dump anything bordered by whitespaces. */
{
const char *p = start;
while (p != end && !ISBLANK (*p) && *p != '\n')
++p;
if (wrapping_line
&& p - start >= pp_remaining_character_count_for_line (pp))
pp_newline (pp);
pp_append_text (pp, start, p);
start = p;
}
if (start != end && ISBLANK (*start))
{
pp_space (pp);
++start;
}
if (start != end && *start == '\n')
{
pp_newline (pp);
++start;
}
}
}
/* Same as pp_wrap_text but wrap text only when in line-wrapping mode. */
static inline void
pp_maybe_wrap_text (pretty_printer *pp, const char *start, const char *end)
{
if (pp_is_wrapping_line (pp))
pp_wrap_text (pp, start, end);
else
pp_append_text (pp, start, end);
}
/* Append to the output area of PRETTY-PRINTER a string specified by its
STARTing character and LENGTH. */
static inline void
pp_append_r (pretty_printer *pp, const char *start, int length)
{
obstack_grow (&pp->buffer->obstack, start, length);
pp->buffer->line_length += length;
}
/* Insert enough spaces into the output area of PRETTY-PRINTER to bring
the column position to the current indentation level, assuming that a
newline has just been written to the buffer. */
void
pp_base_indent (pretty_printer *pp)
{
int n = pp_indentation (pp);
int i;
for (i = 0; i < n; ++i)
pp_space (pp);
}
/* Format a message pointed to by TEXT. The following format specifiers are
recognized as being client independent:
%d, %i: (signed) integer in base ten.
%u: unsigned integer in base ten.
%o: unsigned integer in base eight.
%x: unsigned integer in base sixteen.
%ld, %li, %lo, %lu, %lx: long versions of the above.
%lld, %lli, %llo, %llu, %llx: long long versions.
%wd, %wi, %wo, %wu, %wx: HOST_WIDE_INT versions.
%c: character.
%s: string.
%p: pointer.
%m: strerror(text->err_no) - does not consume a value from args_ptr.
%%: `%'.
%.*s: a substring the length of which is specified by an integer.
%H: location_t. */
void
pp_base_format_text (pretty_printer *pp, text_info *text)
{
for (; *text->format_spec; ++text->format_spec)
{
int precision = 0;
bool wide = false;
/* Ignore text. */
{
const char *p = text->format_spec;
while (*p && *p != '%')
++p;
pp_wrap_text (pp, text->format_spec, p);
text->format_spec = p;
}
if (*text->format_spec == '\0')
break;
/* We got a '%'. Parse precision modifiers, if any. */
switch (*++text->format_spec)
{
case 'w':
wide = true;
++text->format_spec;
break;
case 'l':
do
++precision;
while (*++text->format_spec == 'l');
break;
default:
break;
}
/* We don't support precision beyond that of "long long". */
if (precision > 2)
abort();
switch (*text->format_spec)
{
case 'c':
pp_character (pp, va_arg (*text->args_ptr, int));
break;
case 'd':
case 'i':
if (wide)
pp_wide_integer (pp, va_arg (*text->args_ptr, HOST_WIDE_INT));
else
pp_integer_with_precision
(pp, *text->args_ptr, precision, int, "d");
break;
case 'o':
if (wide)
pp_scalar (pp, "%" HOST_WIDE_INT_PRINT "o",
va_arg (*text->args_ptr, unsigned HOST_WIDE_INT));
else
pp_integer_with_precision
(pp, *text->args_ptr, precision, unsigned, "u");
break;
case 's':
pp_string (pp, va_arg (*text->args_ptr, const char *));
break;
case 'p':
pp_pointer (pp, va_arg (*text->args_ptr, void *));
break;
case 'u':
if (wide)
pp_scalar (pp, HOST_WIDE_INT_PRINT_UNSIGNED,
va_arg (*text->args_ptr, unsigned HOST_WIDE_INT));
else
pp_integer_with_precision
(pp, *text->args_ptr, precision, unsigned, "u");
break;
case 'x':
if (wide)
pp_scalar (pp, HOST_WIDE_INT_PRINT_HEX,
va_arg (*text->args_ptr, unsigned HOST_WIDE_INT));
else
pp_integer_with_precision
(pp, *text->args_ptr, precision, unsigned, "x");
break;
case 'm':
pp_string (pp, xstrerror (text->err_no));
break;
case '%':
pp_character (pp, '%');
break;
case 'H':
{
const location_t *locus = va_arg (*text->args_ptr, location_t *);
pp_string (pp, "file '");
pp_string (pp, locus->file);
pp_string (pp, "', line ");
pp_decimal_int (pp, locus->line);
}
break;
case '.':
{
int n;
const char *s;
/* We handle no precision specifier but `%.*s'. */
if (*++text->format_spec != '*')
abort ();
else if (*++text->format_spec != 's')
abort ();
n = va_arg (*text->args_ptr, int);
s = va_arg (*text->args_ptr, const char *);
pp_append_text (pp, s, s + n);
}
break;
default:
if (!pp_format_decoder (pp) || !(*pp_format_decoder (pp)) (pp, text))
{
/* Hmmm. The client failed to install a format translator
but called us with an unrecognized format. Or, maybe, the
translated string just contains an invalid format, or
has formats in the wrong order. Sorry. */
abort ();
}
}
}
}
/* Helper subroutine of output_verbatim and verbatim. Do the appropriate
settings needed by BUFFER for a verbatim formatting. */
void
pp_base_format_verbatim (pretty_printer *pp, text_info *text)
{
diagnostic_prefixing_rule_t rule = pp_prefixing_rule (pp);
int line_cutoff = pp_line_cutoff (pp);
/* Set verbatim mode. */
pp->prefixing_rule = DIAGNOSTICS_SHOW_PREFIX_NEVER;
pp_line_cutoff (pp) = 0;
/* Do the actual formatting. */
pp_format_text (pp, text);
/* Restore previous settings. */
pp_prefixing_rule (pp) = rule;
pp_line_cutoff (pp) = line_cutoff;
}
/* Flush the content of BUFFER onto the attached stream. */
void
pp_base_flush (pretty_printer *pp)
{
pp_write_text_to_stream (pp);
pp_clear_state (pp);
fputc ('\n', pp->buffer->stream);
fflush (pp->buffer->stream);
pp_needs_newline (pp) = false;
}
/* Sets the number of maximum characters per line PRETTY-PRINTER can
output in line-wrapping mode. A LENGTH value 0 suppresses
line-wrapping. */
void
pp_base_set_line_maximum_length (pretty_printer *pp, int length)
{
pp_line_cutoff (pp) = length;
pp_set_real_maximum_length (pp);
}
/* Clear PRETTY-PRINTER output area text info. */
void
pp_base_clear_output_area (pretty_printer *pp)
{
obstack_free (&pp->buffer->obstack, obstack_base (&pp->buffer->obstack));
pp->buffer->line_length = 0;
}
/* Set PREFIX for PRETTY-PRINTER. */
void
pp_base_set_prefix (pretty_printer *pp, const char *prefix)
{
pp->prefix = prefix;
pp_set_real_maximum_length (pp);
pp->emitted_prefix = false;
pp_indentation (pp) = 0;
}
/* Free PRETTY-PRINTER's prefix, a previously malloc()'d string. */
void
pp_base_destroy_prefix (pretty_printer *pp)
{
if (pp->prefix != NULL)
{
free ((char *) pp->prefix);
pp->prefix = NULL;
}
}
/* Write out PRETTY-PRINTER's prefix. */
void
pp_base_emit_prefix (pretty_printer *pp)
{
if (pp->prefix != NULL)
{
switch (pp_prefixing_rule (pp))
{
default:
case DIAGNOSTICS_SHOW_PREFIX_NEVER:
break;
case DIAGNOSTICS_SHOW_PREFIX_ONCE:
if (pp->emitted_prefix)
{
pp_base_indent (pp);
break;
}
pp_indentation (pp) += 3;
/* Fall through. */
case DIAGNOSTICS_SHOW_PREFIX_EVERY_LINE:
{
int prefix_length = strlen (pp->prefix);
pp_append_r (pp, pp->prefix, prefix_length);
pp->emitted_prefix = true;
}
break;
}
}
}
/* Construct a PRETTY-PRINTER with PREFIX and of MAXIMUM_LENGTH
characters per line. */
void
pp_construct (pretty_printer *pp, const char *prefix, int maximum_length)
{
memset (pp, 0, sizeof (pretty_printer));
pp->buffer = xcalloc (1, sizeof (output_buffer));
obstack_init (&pp->buffer->obstack);
pp->buffer->stream = stderr;
pp_line_cutoff (pp) = maximum_length;
pp_prefixing_rule (pp) = DIAGNOSTICS_SHOW_PREFIX_ONCE;
pp_set_prefix (pp, prefix);
}
/* Append a string delimited by START and END to the output area of
PRETTY-PRINTER. No line wrapping is done. However, if beginning a
new line then emit PRETTY-PRINTER's prefix and skip any leading
whitespace if appropriate. The caller must ensure that it is
safe to do so. */
void
pp_base_append_text (pretty_printer *pp, const char *start, const char *end)
{
/* Emit prefix and skip whitespace if we're starting a new line. */
if (pp->buffer->line_length == 0)
{
pp_emit_prefix (pp);
if (pp_is_wrapping_line (pp))
while (start != end && *start == ' ')
++start;
}
pp_append_r (pp, start, end - start);
}
/* Finishes constructing a NULL-terminated character string representing
the PRETTY-PRINTED text. */
const char *
pp_base_formatted_text (pretty_printer *pp)
{
obstack_1grow (&pp->buffer->obstack, '\0');
return pp_formatted_text_data (pp);
}
/* Return a pointer to the last character emitted in PRETTY-PRINTER's
output area. A NULL pointer means no character available. */
const char *
pp_base_last_position_in_text (const pretty_printer *pp)
{
const char *p = NULL;
struct obstack *text = &pp->buffer->obstack;
if (obstack_base (text) != obstack_next_free (text))
p = ((const char *) obstack_next_free (text)) - 1;
return p;
}
/* Return the amount of characters PRETTY-PRINTER can accept to
make a full line. Meaningful only in line-wrapping mode. */
int
pp_base_remaining_character_count_for_line (pretty_printer *pp)
{
return pp->maximum_length - pp->buffer->line_length;
}
/* Format a message into BUFFER a la printf. */
void
pp_printf (pretty_printer *pp, const char *msg, ...)
{
text_info text;
va_list ap;
va_start (ap, msg);
text.err_no = errno;
text.args_ptr = &ap;
text.format_spec = msg;
pp_format_text (pp, &text);
va_end (ap);
}
/* Output MESSAGE verbatim into BUFFER. */
void
pp_verbatim (pretty_printer *pp, const char *msg, ...)
{
text_info text;
va_list ap;
va_start (ap, msg);
text.err_no = errno;
text.args_ptr = &ap;
text.format_spec = msg;
pp_format_verbatim (pp, &text);
va_end (ap);
}
/* Have PRETTY-PRINTER start a new line. */
void
pp_base_newline (pretty_printer *pp)
{
obstack_1grow (&pp->buffer->obstack, '\n');
pp->buffer->line_length = 0;
}
/* Have PRETTY-PRINTER add a CHARACTER. */
void
pp_base_character (pretty_printer *pp, int c)
{
if (pp_is_wrapping_line (pp)
&& pp_remaining_character_count_for_line (pp) <= 0)
{
pp_newline (pp);
if (ISSPACE (c))
return;
}
obstack_1grow (&pp->buffer->obstack, c);
++pp->buffer->line_length;
}
/* Append a STRING to the output area of PRETTY-PRINTER; the STRING may
be line-wrapped if in appropriate mode. */
void
pp_base_string (pretty_printer *pp, const char *str)
{
pp_maybe_wrap_text (pp, str, str + (str ? strlen (str) : 0));
}