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freebsd-dev/contrib/gcc/pretty-print.c
Alexander Kabaev 6b834ef156 GCC 4.2.0 release.
2007-05-19 01:19:51 +00:00

818 lines
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/* Various declarations for language-independent pretty-print subroutines.
Copyright (C) 2003, 2004, 2005 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, 51 Franklin Street, Fifth Floor, Boston, MA
02110-1301, 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 "intl.h"
#include "pretty-print.h"
#include "tree.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. */
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);
}
/* 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.
%%: '%'.
%<: opening quote.
%>: closing quote.
%': apostrophe (should only be used in untranslated messages;
translations should use appropriate punctuation directly).
%.*s: a substring the length of which is specified by an argument
integer.
%Ns: likewise, but length specified as constant in the format string.
%H: location_t.
%J: a decl tree, from which DECL_SOURCE_LOCATION will be recorded.
Flag 'q': quote formatted text (must come immediately after '%').
Arguments can be used sequentially, or through %N$ resp. *N$
notation Nth argument after the format string. If %N$ / *N$
notation is used, it must be used for all arguments, except %m, %%,
%<, %> and %', which may not have a number, as they do not consume
an argument. When %M$.*N$s is used, M must be N + 1. (This may
also be written %M$.*s, provided N is not otherwise used.) The
format string must have conversion specifiers with argument numbers
1 up to highest argument; each argument may only be used once.
A format string can have at most 30 arguments. */
/* Formatting phases 1 and 2: render TEXT->format_spec plus
TEXT->args_ptr into a series of chunks in PP->buffer->args[].
Phase 3 is in pp_base_format_text. */
void
pp_base_format (pretty_printer *pp, text_info *text)
{
output_buffer *buffer = pp->buffer;
const char *p;
const char **args;
struct chunk_info *new_chunk_array;
unsigned int curarg = 0, chunk = 0, argno;
pp_wrapping_mode_t old_wrapping_mode;
bool any_unnumbered = false, any_numbered = false;
const char **formatters[PP_NL_ARGMAX];
/* Allocate a new chunk structure. */
new_chunk_array = XOBNEW (&buffer->chunk_obstack, struct chunk_info);
new_chunk_array->prev = buffer->cur_chunk_array;
buffer->cur_chunk_array = new_chunk_array;
args = new_chunk_array->args;
/* Formatting phase 1: split up TEXT->format_spec into chunks in
PP->buffer->args[]. Even-numbered chunks are to be output
verbatim, odd-numbered chunks are format specifiers.
%m, %%, %<, %>, and %' are replaced with the appropriate text at
this point. */
memset (formatters, 0, sizeof formatters);
for (p = text->format_spec; *p; )
{
while (*p != '\0' && *p != '%')
{
obstack_1grow (&buffer->chunk_obstack, *p);
p++;
}
if (*p == '\0')
break;
switch (*++p)
{
case '\0':
gcc_unreachable ();
case '%':
obstack_1grow (&buffer->chunk_obstack, '%');
p++;
continue;
case '<':
obstack_grow (&buffer->chunk_obstack,
open_quote, strlen (open_quote));
p++;
continue;
case '>':
case '\'':
obstack_grow (&buffer->chunk_obstack,
close_quote, strlen (close_quote));
p++;
continue;
case 'm':
{
const char *errstr = xstrerror (text->err_no);
obstack_grow (&buffer->chunk_obstack, errstr, strlen (errstr));
}
p++;
continue;
default:
/* Handled in phase 2. Terminate the plain chunk here. */
obstack_1grow (&buffer->chunk_obstack, '\0');
gcc_assert (chunk < PP_NL_ARGMAX * 2);
args[chunk++] = XOBFINISH (&buffer->chunk_obstack, const char *);
break;
}
if (ISDIGIT (*p))
{
char *end;
argno = strtoul (p, &end, 10) - 1;
p = end;
gcc_assert (*p == '$');
p++;
any_numbered = true;
gcc_assert (!any_unnumbered);
}
else
{
argno = curarg++;
any_unnumbered = true;
gcc_assert (!any_numbered);
}
gcc_assert (argno < PP_NL_ARGMAX);
gcc_assert (!formatters[argno]);
formatters[argno] = &args[chunk];
do
{
obstack_1grow (&buffer->chunk_obstack, *p);
p++;
}
while (strchr ("qwl+#", p[-1]));
if (p[-1] == '.')
{
/* We handle '%.Ns' and '%.*s' or '%M$.*N$s'
(where M == N + 1). */
if (ISDIGIT (*p))
{
do
{
obstack_1grow (&buffer->chunk_obstack, *p);
p++;
}
while (ISDIGIT (p[-1]));
gcc_assert (p[-1] == 's');
}
else
{
gcc_assert (*p == '*');
obstack_1grow (&buffer->chunk_obstack, '*');
p++;
if (ISDIGIT (*p))
{
char *end;
unsigned int argno2 = strtoul (p, &end, 10) - 1;
p = end;
gcc_assert (argno2 == argno - 1);
gcc_assert (!any_unnumbered);
gcc_assert (*p == '$');
p++;
formatters[argno2] = formatters[argno];
}
else
{
gcc_assert (!any_numbered);
formatters[argno+1] = formatters[argno];
curarg++;
}
gcc_assert (*p == 's');
obstack_1grow (&buffer->chunk_obstack, 's');
p++;
}
}
if (*p == '\0')
break;
obstack_1grow (&buffer->chunk_obstack, '\0');
gcc_assert (chunk < PP_NL_ARGMAX * 2);
args[chunk++] = XOBFINISH (&buffer->chunk_obstack, const char *);
}
obstack_1grow (&buffer->chunk_obstack, '\0');
gcc_assert (chunk < PP_NL_ARGMAX * 2);
args[chunk++] = XOBFINISH (&buffer->chunk_obstack, const char *);
args[chunk] = 0;
/* Set output to the argument obstack, and switch line-wrapping and
prefixing off. */
buffer->obstack = &buffer->chunk_obstack;
old_wrapping_mode = pp_set_verbatim_wrapping (pp);
/* Second phase. Replace each formatter with the formatted text it
corresponds to. */
for (argno = 0; formatters[argno]; argno++)
{
int precision = 0;
bool wide = false;
bool plus = false;
bool hash = false;
bool quote = false;
/* We do not attempt to enforce any ordering on the modifier
characters. */
for (p = *formatters[argno];; p++)
{
switch (*p)
{
case 'q':
gcc_assert (!quote);
quote = true;
continue;
case '+':
gcc_assert (!plus);
plus = true;
continue;
case '#':
gcc_assert (!hash);
hash = true;
continue;
case 'w':
gcc_assert (!wide);
wide = true;
continue;
case 'l':
/* We don't support precision beyond that of "long long". */
gcc_assert (precision < 2);
precision++;
continue;
}
break;
}
gcc_assert (!wide || precision == 0);
if (quote)
pp_string (pp, open_quote);
switch (*p)
{
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, "o");
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 'H':
{
location_t *locus = va_arg (*text->args_ptr, location_t *);
gcc_assert (text->locus != NULL);
*text->locus = *locus;
}
break;
case 'J':
{
tree t = va_arg (*text->args_ptr, tree);
gcc_assert (text->locus != NULL);
*text->locus = DECL_SOURCE_LOCATION (t);
}
break;
case '.':
{
int n;
const char *s;
/* We handle '%.Ns' and '%.*s' or '%M$.*N$s'
(where M == N + 1). The format string should be verified
already from the first phase. */
p++;
if (ISDIGIT (*p))
{
char *end;
n = strtoul (p, &end, 10);
p = end;
gcc_assert (*p == 's');
}
else
{
gcc_assert (*p == '*');
p++;
gcc_assert (*p == 's');
n = va_arg (*text->args_ptr, int);
/* This consumes a second entry in the formatters array. */
gcc_assert (formatters[argno] == formatters[argno+1]);
argno++;
}
s = va_arg (*text->args_ptr, const char *);
pp_append_text (pp, s, s + n);
}
break;
default:
{
bool ok;
gcc_assert (pp_format_decoder (pp));
ok = pp_format_decoder (pp) (pp, text, p,
precision, wide, plus, hash);
gcc_assert (ok);
}
}
if (quote)
pp_string (pp, close_quote);
obstack_1grow (&buffer->chunk_obstack, '\0');
*formatters[argno] = XOBFINISH (&buffer->chunk_obstack, const char *);
}
#ifdef ENABLE_CHECKING
for (; argno < PP_NL_ARGMAX; argno++)
gcc_assert (!formatters[argno]);
#endif
/* Revert to normal obstack and wrapping mode. */
buffer->obstack = &buffer->formatted_obstack;
buffer->line_length = 0;
pp_wrapping_mode (pp) = old_wrapping_mode;
pp_clear_state (pp);
}
/* Format of a message pointed to by TEXT. */
void
pp_base_output_formatted_text (pretty_printer *pp)
{
unsigned int chunk;
output_buffer *buffer = pp_buffer (pp);
struct chunk_info *chunk_array = buffer->cur_chunk_array;
const char **args = chunk_array->args;
gcc_assert (buffer->obstack == &buffer->formatted_obstack);
gcc_assert (buffer->line_length == 0);
/* This is a third phase, first 2 phases done in pp_base_format_args.
Now we actually print it. */
for (chunk = 0; args[chunk]; chunk++)
pp_string (pp, args[chunk]);
/* Deallocate the chunk structure and everything after it (i.e. the
associated series of formatted strings). */
buffer->cur_chunk_array = chunk_array->prev;
obstack_free (&buffer->chunk_obstack, chunk_array);
}
/* 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)
{
/* Set verbatim mode. */
pp_wrapping_mode_t oldmode = pp_set_verbatim_wrapping (pp);
/* Do the actual formatting. */
pp_format (pp, text);
pp_output_formatted_text (pp);
/* Restore previous settings. */
pp_wrapping_mode (pp) = oldmode;
}
/* 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 = XCNEW (output_buffer);
obstack_init (&pp->buffer->chunk_obstack);
obstack_init (&pp->buffer->formatted_obstack);
pp->buffer->obstack = &pp->buffer->formatted_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;
text.locus = NULL;
pp_format (pp, &text);
pp_output_formatted_text (pp);
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;
text.locus = NULL;
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));
}
/* Maybe print out a whitespace if needed. */
void
pp_base_maybe_space (pretty_printer *pp)
{
if (pp_base (pp)->padding != pp_none)
{
pp_space (pp);
pp_base (pp)->padding = pp_none;
}
}
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