409 lines
13 KiB
C++
409 lines
13 KiB
C++
/* MD reader definitions.
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Copyright (C) 1987-2023 Free Software Foundation, Inc.
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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_READ_MD_H
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#define GCC_READ_MD_H
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#include "obstack.h"
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/* Records a position in the file. */
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class file_location {
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public:
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file_location () {}
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file_location (const char *, int, int);
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const char *filename;
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int lineno;
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int colno;
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};
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inline file_location::file_location (const char *filename_in, int lineno_in, int colno_in)
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: filename (filename_in), lineno (lineno_in), colno (colno_in) {}
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/* Holds one symbol or number in the .md file. */
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struct md_name {
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/* The name as it appeared in the .md file. Names are syntactically
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limited to the length of this buffer. */
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char buffer[256];
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/* The name that should actually be used by the generator programs.
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This is an expansion of NAME, after things like constant substitution. */
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char *string;
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};
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/* This structure represents a constant defined by define_constant,
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define_enum, or such-like. */
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struct md_constant {
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/* The name of the constant. */
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char *name;
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/* The string to which the constants expands. */
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char *value;
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/* If the constant is associated with a enumeration, this field
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points to that enumeration, otherwise it is null. */
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struct enum_type *parent_enum;
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};
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/* This structure represents one value in an enum_type. */
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struct enum_value {
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/* The next value in the enum, or null if this is the last. */
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struct enum_value *next;
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/* The name of the value as it appears in the .md file. */
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char *name;
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/* The definition of the related C value. */
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struct md_constant *def;
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};
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/* This structure represents an enum defined by define_enum or the like. */
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struct enum_type {
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/* The C name of the enumeration. */
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char *name;
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/* True if this is an md-style enum (DEFINE_ENUM) rather than
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a C-style enum (DEFINE_C_ENUM). */
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bool md_p;
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/* The values of the enumeration. There is always at least one. */
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struct enum_value *values;
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/* A pointer to the null terminator in VALUES. */
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struct enum_value **tail_ptr;
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/* The number of enumeration values. */
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unsigned int num_values;
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};
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/* Describes one instance of an overloaded_name. */
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struct overloaded_instance {
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/* The next instance in the chain, or null if none. */
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overloaded_instance *next;
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/* The values that the overloaded_name arguments should have for this
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instance to be chosen. Each value is a C token. */
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vec<const char *> arg_values;
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/* The full (non-overloaded) name of the pattern. */
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const char *name;
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/* The corresponding define_expand or define_insn. */
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rtx insn;
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};
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/* Describes a define_expand or define_insn whose name was preceded by '@'.
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Overloads are uniquely determined by their name and the types of their
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arguments; it's possible to have overloads with the same name but
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different argument types. */
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struct overloaded_name {
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/* The next overloaded name in the chain. */
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overloaded_name *next;
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/* The overloaded name (i.e. the name with "@" character and
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"<...>" placeholders removed). */
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const char *name;
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/* The C types of the iterators that determine the underlying pattern,
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in the same order as in the pattern name. E.g. "<mode>" in the
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pattern name would give a "machine_mode" argument here. */
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vec<const char *> arg_types;
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/* The first instance associated with this overloaded_name. */
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overloaded_instance *first_instance;
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/* Where to chain new overloaded_instances. */
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overloaded_instance **next_instance_ptr;
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};
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struct mapping;
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/* A class for reading .md files and RTL dump files.
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Implemented in read-md.cc.
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This class has responsibility for reading chars from input files, and
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for certain common top-level directives including the "include"
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directive.
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It does not handle parsing the hierarchically-nested expressions of
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rtl.def; for that see the rtx_reader subclass below (implemented in
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read-rtl.cc). */
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class md_reader
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{
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public:
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/* Associates PTR (which can be a string, etc.) with the file location
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specified by LOC. */
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struct ptr_loc {
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const void *ptr;
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file_location loc;
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};
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md_reader (bool compact);
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virtual ~md_reader ();
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bool read_md_files (int, const char **, bool (*) (const char *));
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bool read_file (const char *filename);
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bool read_file_fragment (const char *filename,
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int first_line,
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int last_line);
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/* A hook that handles a single .md-file directive, up to but not
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including the closing ')'. It takes two arguments: the file position
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at which the directive started, and the name of the directive. The next
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unread character is the optional space after the directive name. */
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virtual void handle_unknown_directive (file_location, const char *) = 0;
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file_location get_current_location () const;
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bool is_compact () const { return m_compact; }
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/* Defined in read-md.cc. */
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int read_char (void);
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void unread_char (int ch);
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file_location read_name (struct md_name *name);
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file_location read_name_or_nil (struct md_name *);
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void read_escape ();
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char *read_quoted_string ();
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char *read_braced_string ();
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char *read_string (int star_if_braced);
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void read_skip_construct (int depth, file_location loc);
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void require_char (char expected);
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void require_char_ws (char expected);
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void require_word_ws (const char *expected);
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int peek_char (void);
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void set_md_ptr_loc (const void *ptr, file_location);
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const struct ptr_loc *get_md_ptr_loc (const void *ptr);
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void copy_md_ptr_loc (const void *new_ptr, const void *old_ptr);
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void fprint_md_ptr_loc (FILE *outf, const void *ptr);
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void print_md_ptr_loc (const void *ptr);
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struct enum_type *lookup_enum_type (const char *name);
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void traverse_enum_types (htab_trav callback, void *info);
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void handle_constants ();
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void traverse_md_constants (htab_trav callback, void *info);
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void handle_enum (file_location loc, bool md_p);
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const char *join_c_conditions (const char *cond1, const char *cond2);
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void fprint_c_condition (FILE *outf, const char *cond);
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void print_c_condition (const char *cond);
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/* Defined in read-rtl.cc. */
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const char *apply_iterator_to_string (const char *string);
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rtx copy_rtx_for_iterators (rtx original);
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void read_conditions ();
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void record_potential_iterator_use (struct iterator_group *group,
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file_location loc, rtx x,
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unsigned int index, const char *name);
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struct mapping *read_mapping (struct iterator_group *group, htab_t table);
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overloaded_name *handle_overloaded_name (rtx, vec<mapping *> *);
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const char *get_top_level_filename () const { return m_toplevel_fname; }
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const char *get_filename () const { return m_read_md_filename; }
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int get_lineno () const { return m_read_md_lineno; }
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int get_colno () const { return m_read_md_colno; }
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struct obstack *get_string_obstack () { return &m_string_obstack; }
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htab_t get_md_constants () { return m_md_constants; }
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overloaded_name *get_overloads () const { return m_first_overload; }
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private:
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/* A singly-linked list of filenames. */
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struct file_name_list {
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struct file_name_list *next;
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const char *fname;
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};
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private:
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void handle_file ();
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void handle_toplevel_file ();
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void handle_include (file_location loc);
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void add_include_path (const char *arg);
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bool read_name_1 (struct md_name *name, file_location *out_loc);
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private:
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/* Are we reading a compact dump? */
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bool m_compact;
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/* The name of the toplevel file that indirectly included
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m_read_md_file. */
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const char *m_toplevel_fname;
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/* The directory part of m_toplevel_fname
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NULL if m_toplevel_fname is a bare filename. */
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char *m_base_dir;
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/* The file we are reading. */
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FILE *m_read_md_file;
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/* The filename of m_read_md_file. */
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const char *m_read_md_filename;
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/* The current line number in m_read_md_file. */
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int m_read_md_lineno;
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/* The current column number in m_read_md_file. */
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int m_read_md_colno;
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/* The column number before the last newline, so that
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we can handle unread_char ('\n') at least once whilst
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retaining column information. */
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int m_last_line_colno;
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/* The first directory to search. */
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file_name_list *m_first_dir_md_include;
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/* A pointer to the null terminator of the md include chain. */
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file_name_list **m_last_dir_md_include_ptr;
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/* Obstack used for allocating MD strings. */
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struct obstack m_string_obstack;
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/* A table of ptr_locs, hashed on the PTR field. */
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htab_t m_ptr_locs;
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/* An obstack for the above. Plain xmalloc is a bit heavyweight for a
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small structure like ptr_loc. */
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struct obstack m_ptr_loc_obstack;
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/* A hash table of triples (A, B, C), where each of A, B and C is a condition
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and A is equivalent to "B && C". This is used to keep track of the source
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of conditions that are made up of separate MD strings (such as the split
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condition of a define_insn_and_split). */
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htab_t m_joined_conditions;
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/* An obstack for allocating joined_conditions entries. */
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struct obstack m_joined_conditions_obstack;
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/* A table of md_constant structures, hashed by name. Null if no
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constant expansion should occur. */
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htab_t m_md_constants;
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/* A table of enum_type structures, hashed by name. */
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htab_t m_enum_types;
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/* If non-zero, filter the input to just this subset of lines. */
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int m_first_line;
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int m_last_line;
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/* The first overloaded_name. */
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overloaded_name *m_first_overload;
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/* Where to chain further overloaded_names, */
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overloaded_name **m_next_overload_ptr;
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/* A hash table of overloaded_names, keyed off their name and the types of
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their arguments. */
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htab_t m_overloads_htab;
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};
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/* Global singleton; constrast with rtx_reader_ptr below. */
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extern md_reader *md_reader_ptr;
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/* An md_reader subclass which skips unknown directives, for
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the gen* tools that purely use read-md.o. */
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class noop_reader : public md_reader
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{
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public:
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noop_reader () : md_reader (false) {}
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/* A dummy implementation which skips unknown directives. */
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void handle_unknown_directive (file_location, const char *) override;
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};
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/* An md_reader subclass that actually handles full hierarchical
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rtx expressions.
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Implemented in read-rtl.cc. */
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class rtx_reader : public md_reader
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{
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public:
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rtx_reader (bool compact);
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~rtx_reader ();
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bool read_rtx (const char *rtx_name, vec<rtx> *rtxen);
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rtx rtx_alloc_for_name (const char *);
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rtx read_rtx_code (const char *code_name);
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virtual rtx read_rtx_operand (rtx return_rtx, int idx);
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rtx read_nested_rtx ();
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rtx read_rtx_variadic (rtx form);
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char *read_until (const char *terminator_chars, bool consume_terminator);
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virtual void handle_any_trailing_information (rtx) {}
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virtual rtx postprocess (rtx x) { return x; }
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/* Hook to allow function_reader subclass to put STRINGBUF into gc-managed
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memory, rather than within an obstack.
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This base class implementation is a no-op. */
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virtual const char *finalize_string (char *stringbuf) { return stringbuf; }
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protected:
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/* Analogous to rtx_writer's m_in_call_function_usage. */
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bool m_in_call_function_usage;
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/* Support for "reuse_rtx" directives. */
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auto_vec<rtx> m_reuse_rtx_by_id;
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};
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/* Global singleton; constrast with md_reader_ptr above. */
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extern rtx_reader *rtx_reader_ptr;
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extern void (*include_callback) (const char *);
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/* Read the next character from the MD file. */
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inline int
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read_char (void)
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{
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return md_reader_ptr->read_char ();
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}
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/* Put back CH, which was the last character read from the MD file. */
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inline void
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unread_char (int ch)
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{
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md_reader_ptr->unread_char (ch);
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}
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extern hashval_t leading_string_hash (const void *);
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extern int leading_string_eq_p (const void *, const void *);
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extern const char *join_c_conditions (const char *, const char *);
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extern void message_at (file_location, const char *, ...) ATTRIBUTE_PRINTF_2;
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extern void error_at (file_location, const char *, ...) ATTRIBUTE_PRINTF_2;
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extern void fatal_at (file_location, const char *, ...) ATTRIBUTE_PRINTF_2;
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extern void fatal_with_file_and_line (const char *, ...)
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ATTRIBUTE_PRINTF_1 ATTRIBUTE_NORETURN;
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extern void fatal_expected_char (int, int) ATTRIBUTE_NORETURN;
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extern int read_skip_spaces (void);
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extern int n_comma_elts (const char *);
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extern const char *scan_comma_elt (const char **);
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extern void upcase_string (char *);
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extern void traverse_enum_types (htab_trav, void *);
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extern struct enum_type *lookup_enum_type (const char *);
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#endif /* GCC_READ_MD_H */
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