421 lines
15 KiB
C++
421 lines
15 KiB
C++
/* Various declarations for language-independent pretty-print subroutines.
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Copyright (C) 2002-2019 Free Software Foundation, Inc.
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Contributed by Gabriel Dos Reis <gdr@integrable-solutions.net>
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This file is part of GCC.
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GCC is free software; you can redistribute it and/or modify it under
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the terms of the GNU General Public License as published by the Free
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Software Foundation; either version 3, or (at your option) any later
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version.
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GCC is distributed in the hope that it will be useful, but WITHOUT ANY
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WARRANTY; without even the implied warranty of MERCHANTABILITY or
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FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License
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for more details.
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You should have received a copy of the GNU General Public License
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along with GCC; see the file COPYING3. If not see
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<http://www.gnu.org/licenses/>. */
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#ifndef GCC_PRETTY_PRINT_H
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#define GCC_PRETTY_PRINT_H
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#include "obstack.h"
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/* Maximum number of format string arguments. */
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#define PP_NL_ARGMAX 30
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/* The type of a text to be formatted according a format specification
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along with a list of things. */
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struct text_info
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{
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const char *format_spec;
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va_list *args_ptr;
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int err_no; /* for %m */
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void **x_data;
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rich_location *m_richloc;
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void set_location (unsigned int idx, location_t loc,
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enum range_display_kind range_display_kind);
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location_t get_location (unsigned int index_of_location) const;
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};
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/* How often diagnostics are prefixed by their locations:
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o DIAGNOSTICS_SHOW_PREFIX_NEVER: never - not yet supported;
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o DIAGNOSTICS_SHOW_PREFIX_ONCE: emit only once;
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o DIAGNOSTICS_SHOW_PREFIX_EVERY_LINE: emit each time a physical
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line is started. */
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enum diagnostic_prefixing_rule_t
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{
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DIAGNOSTICS_SHOW_PREFIX_ONCE = 0x0,
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DIAGNOSTICS_SHOW_PREFIX_NEVER = 0x1,
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DIAGNOSTICS_SHOW_PREFIX_EVERY_LINE = 0x2
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};
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/* The chunk_info data structure forms a stack of the results from the
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first phase of formatting (pp_format) which have not yet been
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output (pp_output_formatted_text). A stack is necessary because
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the diagnostic starter may decide to generate its own output by way
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of the formatter. */
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struct chunk_info
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{
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/* Pointer to previous chunk on the stack. */
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struct chunk_info *prev;
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/* Array of chunks to output. Each chunk is a NUL-terminated string.
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In the first phase of formatting, even-numbered chunks are
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to be output verbatim, odd-numbered chunks are format specifiers.
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The second phase replaces all odd-numbered chunks with formatted
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text, and the third phase simply emits all the chunks in sequence
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with appropriate line-wrapping. */
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const char *args[PP_NL_ARGMAX * 2];
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};
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/* The output buffer datatype. This is best seen as an abstract datatype
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whose fields should not be accessed directly by clients. */
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struct output_buffer
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{
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output_buffer ();
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~output_buffer ();
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/* Obstack where the text is built up. */
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struct obstack formatted_obstack;
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/* Obstack containing a chunked representation of the format
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specification plus arguments. */
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struct obstack chunk_obstack;
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/* Currently active obstack: one of the above two. This is used so
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that the text formatters don't need to know which phase we're in. */
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struct obstack *obstack;
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/* Stack of chunk arrays. These come from the chunk_obstack. */
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struct chunk_info *cur_chunk_array;
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/* Where to output formatted text. */
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FILE *stream;
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/* The amount of characters output so far. */
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int line_length;
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/* This must be large enough to hold any printed integer or
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floating-point value. */
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char digit_buffer[128];
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/* Nonzero means that text should be flushed when
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appropriate. Otherwise, text is buffered until either
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pp_really_flush or pp_clear_output_area are called. */
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bool flush_p;
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};
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/* Finishes constructing a NULL-terminated character string representing
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the buffered text. */
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static inline const char *
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output_buffer_formatted_text (output_buffer *buff)
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{
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obstack_1grow (buff->obstack, '\0');
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return (const char *) obstack_base (buff->obstack);
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}
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/* Append to the output buffer a string specified by its
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STARTing character and LENGTH. */
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static inline void
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output_buffer_append_r (output_buffer *buff, const char *start, int length)
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{
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gcc_checking_assert (start);
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obstack_grow (buff->obstack, start, length);
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for (int i = 0; i < length; i++)
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if (start[i] == '\n')
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buff->line_length = 0;
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else
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buff->line_length++;
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}
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/* Return a pointer to the last character emitted in the
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output_buffer. A NULL pointer means no character available. */
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static inline const char *
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output_buffer_last_position_in_text (const output_buffer *buff)
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{
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const char *p = NULL;
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struct obstack *text = buff->obstack;
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if (obstack_base (text) != obstack_next_free (text))
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p = ((const char *) obstack_next_free (text)) - 1;
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return p;
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}
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/* The type of pretty-printer flags passed to clients. */
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typedef unsigned int pp_flags;
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enum pp_padding
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{
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pp_none, pp_before, pp_after
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};
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/* Structure for switching in and out of verbatim mode in a convenient
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manner. */
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struct pp_wrapping_mode_t
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{
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/* Current prefixing rule. */
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diagnostic_prefixing_rule_t rule;
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/* The ideal upper bound of number of characters per line, as suggested
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by front-end. */
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int line_cutoff;
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};
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/* Maximum characters per line in automatic line wrapping mode.
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Zero means don't wrap lines. */
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#define pp_line_cutoff(PP) (PP)->wrapping.line_cutoff
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/* Prefixing rule used in formatting a diagnostic message. */
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#define pp_prefixing_rule(PP) (PP)->wrapping.rule
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/* Get or set the wrapping mode as a single entity. */
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#define pp_wrapping_mode(PP) (PP)->wrapping
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/* The type of a hook that formats client-specific data onto a pretty_printer.
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A client-supplied formatter returns true if everything goes well,
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otherwise it returns false. */
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typedef bool (*printer_fn) (pretty_printer *, text_info *, const char *,
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int, bool, bool, bool, bool *, const char **);
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/* Client supplied function used to decode formats. */
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#define pp_format_decoder(PP) (PP)->format_decoder
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/* Base class for an optional client-supplied object for doing additional
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processing between stages 2 and 3 of formatted printing. */
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class format_postprocessor
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{
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public:
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virtual ~format_postprocessor () {}
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virtual void handle (pretty_printer *) = 0;
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};
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/* TRUE if a newline character needs to be added before further
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formatting. */
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#define pp_needs_newline(PP) (PP)->need_newline
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/* True if PRETTY-PRINTER is in line-wrapping mode. */
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#define pp_is_wrapping_line(PP) (pp_line_cutoff (PP) > 0)
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/* The amount of whitespace to be emitted when starting a new line. */
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#define pp_indentation(PP) (PP)->indent_skip
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/* True if identifiers are translated to the locale character set on
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output. */
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#define pp_translate_identifiers(PP) (PP)->translate_identifiers
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/* True if colors should be shown. */
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#define pp_show_color(PP) (PP)->show_color
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/* The data structure that contains the bare minimum required to do
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proper pretty-printing. Clients may derived from this structure
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and add additional fields they need. */
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struct pretty_printer
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{
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/* Default construct a pretty printer with specified
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maximum line length cut off limit. */
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explicit pretty_printer (int = 0);
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virtual ~pretty_printer ();
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/* Where we print external representation of ENTITY. */
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output_buffer *buffer;
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/* The prefix for each new line. If non-NULL, this is "owned" by the
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pretty_printer, and will eventually be free-ed. */
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char *prefix;
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/* Where to put whitespace around the entity being formatted. */
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pp_padding padding;
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/* The real upper bound of number of characters per line, taking into
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account the case of a very very looong prefix. */
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int maximum_length;
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/* Indentation count. */
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int indent_skip;
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/* Current wrapping mode. */
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pp_wrapping_mode_t wrapping;
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/* If non-NULL, this function formats a TEXT into the BUFFER. When called,
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TEXT->format_spec points to a format code. FORMAT_DECODER should call
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pp_string (and related functions) to add data to the BUFFER.
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FORMAT_DECODER can read arguments from *TEXT->args_pts using VA_ARG.
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If the BUFFER needs additional characters from the format string, it
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should advance the TEXT->format_spec as it goes. When FORMAT_DECODER
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returns, TEXT->format_spec should point to the last character processed.
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The QUOTE and BUFFER_PTR are passed in, to allow for deferring-handling
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of format codes (e.g. %H and %I in the C++ frontend). */
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printer_fn format_decoder;
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/* If non-NULL, this is called by pp_format once after all format codes
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have been processed, to allow for client-specific postprocessing.
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This is used by the C++ frontend for handling the %H and %I
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format codes (which interract with each other). */
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format_postprocessor *m_format_postprocessor;
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/* Nonzero if current PREFIX was emitted at least once. */
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bool emitted_prefix;
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/* Nonzero means one should emit a newline before outputting anything. */
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bool need_newline;
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/* Nonzero means identifiers are translated to the locale character
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set on output. */
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bool translate_identifiers;
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/* Nonzero means that text should be colorized. */
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bool show_color;
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};
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static inline const char *
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pp_get_prefix (const pretty_printer *pp) { return pp->prefix; }
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#define pp_space(PP) pp_character (PP, ' ')
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#define pp_left_paren(PP) pp_character (PP, '(')
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#define pp_right_paren(PP) pp_character (PP, ')')
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#define pp_left_bracket(PP) pp_character (PP, '[')
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#define pp_right_bracket(PP) pp_character (PP, ']')
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#define pp_left_brace(PP) pp_character (PP, '{')
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#define pp_right_brace(PP) pp_character (PP, '}')
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#define pp_semicolon(PP) pp_character (PP, ';')
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#define pp_comma(PP) pp_character (PP, ',')
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#define pp_dot(PP) pp_character (PP, '.')
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#define pp_colon(PP) pp_character (PP, ':')
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#define pp_colon_colon(PP) pp_string (PP, "::")
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#define pp_arrow(PP) pp_string (PP, "->")
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#define pp_equal(PP) pp_character (PP, '=')
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#define pp_question(PP) pp_character (PP, '?')
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#define pp_bar(PP) pp_character (PP, '|')
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#define pp_bar_bar(PP) pp_string (PP, "||")
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#define pp_carret(PP) pp_character (PP, '^')
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#define pp_ampersand(PP) pp_character (PP, '&')
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#define pp_ampersand_ampersand(PP) pp_string (PP, "&&")
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#define pp_less(PP) pp_character (PP, '<')
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#define pp_less_equal(PP) pp_string (PP, "<=")
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#define pp_greater(PP) pp_character (PP, '>')
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#define pp_greater_equal(PP) pp_string (PP, ">=")
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#define pp_plus(PP) pp_character (PP, '+')
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#define pp_minus(PP) pp_character (PP, '-')
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#define pp_star(PP) pp_character (PP, '*')
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#define pp_slash(PP) pp_character (PP, '/')
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#define pp_modulo(PP) pp_character (PP, '%')
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#define pp_exclamation(PP) pp_character (PP, '!')
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#define pp_complement(PP) pp_character (PP, '~')
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#define pp_quote(PP) pp_character (PP, '\'')
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#define pp_backquote(PP) pp_character (PP, '`')
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#define pp_doublequote(PP) pp_character (PP, '"')
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#define pp_underscore(PP) pp_character (PP, '_')
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#define pp_maybe_newline_and_indent(PP, N) \
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if (pp_needs_newline (PP)) pp_newline_and_indent (PP, N)
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#define pp_scalar(PP, FORMAT, SCALAR) \
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do \
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{ \
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sprintf (pp_buffer (PP)->digit_buffer, FORMAT, SCALAR); \
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pp_string (PP, pp_buffer (PP)->digit_buffer); \
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} \
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while (0)
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#define pp_decimal_int(PP, I) pp_scalar (PP, "%d", I)
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#define pp_unsigned_wide_integer(PP, I) \
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pp_scalar (PP, HOST_WIDE_INT_PRINT_UNSIGNED, (unsigned HOST_WIDE_INT) I)
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#define pp_wide_int(PP, W, SGN) \
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do \
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{ \
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print_dec (W, pp_buffer (PP)->digit_buffer, SGN); \
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pp_string (PP, pp_buffer (PP)->digit_buffer); \
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} \
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while (0)
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#define pp_double(PP, F) pp_scalar (PP, "%f", F)
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#define pp_pointer(PP, P) pp_scalar (PP, "%p", P)
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#define pp_identifier(PP, ID) pp_string (PP, (pp_translate_identifiers (PP) \
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? identifier_to_locale (ID) \
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: (ID)))
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#define pp_buffer(PP) (PP)->buffer
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extern void pp_set_line_maximum_length (pretty_printer *, int);
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extern void pp_set_prefix (pretty_printer *, char *);
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extern char *pp_take_prefix (pretty_printer *);
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extern void pp_destroy_prefix (pretty_printer *);
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extern int pp_remaining_character_count_for_line (pretty_printer *);
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extern void pp_clear_output_area (pretty_printer *);
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extern const char *pp_formatted_text (pretty_printer *);
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extern const char *pp_last_position_in_text (const pretty_printer *);
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extern void pp_emit_prefix (pretty_printer *);
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extern void pp_append_text (pretty_printer *, const char *, const char *);
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extern void pp_newline_and_flush (pretty_printer *);
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extern void pp_newline_and_indent (pretty_printer *, int);
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extern void pp_separate_with (pretty_printer *, char);
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/* If we haven't already defined a front-end-specific diagnostics
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style, use the generic one. */
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#ifdef GCC_DIAG_STYLE
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#define GCC_PPDIAG_STYLE GCC_DIAG_STYLE
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#else
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#define GCC_PPDIAG_STYLE __gcc_diag__
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#endif
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/* This header may be included before diagnostics-core.h, hence the duplicate
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definitions to allow for GCC-specific formats. */
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#if GCC_VERSION >= 3005
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#define ATTRIBUTE_GCC_PPDIAG(m, n) __attribute__ ((__format__ (GCC_PPDIAG_STYLE, m ,n))) ATTRIBUTE_NONNULL(m)
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#else
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#define ATTRIBUTE_GCC_PPDIAG(m, n) ATTRIBUTE_NONNULL(m)
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#endif
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extern void pp_printf (pretty_printer *, const char *, ...)
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ATTRIBUTE_GCC_PPDIAG(2,3);
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extern void pp_verbatim (pretty_printer *, const char *, ...)
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ATTRIBUTE_GCC_PPDIAG(2,3);
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extern void pp_flush (pretty_printer *);
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extern void pp_really_flush (pretty_printer *);
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extern void pp_format (pretty_printer *, text_info *);
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extern void pp_output_formatted_text (pretty_printer *);
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extern void pp_format_verbatim (pretty_printer *, text_info *);
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extern void pp_indent (pretty_printer *);
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extern void pp_newline (pretty_printer *);
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extern void pp_character (pretty_printer *, int);
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extern void pp_string (pretty_printer *, const char *);
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extern void pp_write_text_to_stream (pretty_printer *);
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extern void pp_write_text_as_dot_label_to_stream (pretty_printer *, bool);
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extern void pp_maybe_space (pretty_printer *);
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extern void pp_begin_quote (pretty_printer *, bool);
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extern void pp_end_quote (pretty_printer *, bool);
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/* Switch into verbatim mode and return the old mode. */
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static inline pp_wrapping_mode_t
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pp_set_verbatim_wrapping_ (pretty_printer *pp)
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{
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pp_wrapping_mode_t oldmode = pp_wrapping_mode (pp);
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pp_line_cutoff (pp) = 0;
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pp_prefixing_rule (pp) = DIAGNOSTICS_SHOW_PREFIX_NEVER;
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return oldmode;
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}
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#define pp_set_verbatim_wrapping(PP) pp_set_verbatim_wrapping_ (PP)
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extern const char *identifier_to_locale (const char *);
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extern void *(*identifier_to_locale_alloc) (size_t);
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extern void (*identifier_to_locale_free) (void *);
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/* Print I to PP in decimal. */
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inline void
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pp_wide_integer (pretty_printer *pp, HOST_WIDE_INT i)
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{
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pp_scalar (pp, HOST_WIDE_INT_PRINT_DEC, i);
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}
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template<unsigned int N, typename T>
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void pp_wide_integer (pretty_printer *pp, const poly_int_pod<N, T> &);
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#endif /* GCC_PRETTY_PRINT_H */
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