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annotate gcc/read-md.h @ 158:494b0b89df80 default tip

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author Shinji KONO <kono@ie.u-ryukyu.ac.jp>
date Mon, 25 May 2020 18:13:55 +0900
parents 1830386684a0
children
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1 /* MD reader definitions.
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2 Copyright (C) 1987-2020 Free Software Foundation, Inc.
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3
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4 This file is part of GCC.
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5
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6 GCC is free software; you can redistribute it and/or modify it under
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7 the terms of the GNU General Public License as published by the Free
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8 Software Foundation; either version 3, or (at your option) any later
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9 version.
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10
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11 GCC is distributed in the hope that it will be useful, but WITHOUT ANY
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12 WARRANTY; without even the implied warranty of MERCHANTABILITY or
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13 FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License
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14 for more details.
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15
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16 You should have received a copy of the GNU General Public License
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17 along with GCC; see the file COPYING3. If not see
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18 <http://www.gnu.org/licenses/>. */
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19
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20 #ifndef GCC_READ_MD_H
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21 #define GCC_READ_MD_H
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22
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23 #include "obstack.h"
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24
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25 /* Records a position in the file. */
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26 class file_location {
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27 public:
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28 file_location () {}
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29 file_location (const char *, int, int);
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30
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31 const char *filename;
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32 int lineno;
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33 int colno;
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34 };
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35
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36 inline file_location::file_location (const char *filename_in, int lineno_in, int colno_in)
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37 : filename (filename_in), lineno (lineno_in), colno (colno_in) {}
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38
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39 /* Holds one symbol or number in the .md file. */
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40 struct md_name {
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41 /* The name as it appeared in the .md file. Names are syntactically
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42 limited to the length of this buffer. */
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43 char buffer[256];
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44
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45 /* The name that should actually be used by the generator programs.
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46 This is an expansion of NAME, after things like constant substitution. */
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47 char *string;
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48 };
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49
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50 /* This structure represents a constant defined by define_constant,
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51 define_enum, or such-like. */
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52 struct md_constant {
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53 /* The name of the constant. */
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54 char *name;
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55
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56 /* The string to which the constants expands. */
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57 char *value;
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58
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59 /* If the constant is associated with a enumeration, this field
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60 points to that enumeration, otherwise it is null. */
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61 struct enum_type *parent_enum;
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62 };
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63
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64 /* This structure represents one value in an enum_type. */
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65 struct enum_value {
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66 /* The next value in the enum, or null if this is the last. */
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67 struct enum_value *next;
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68
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69 /* The name of the value as it appears in the .md file. */
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70 char *name;
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71
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72 /* The definition of the related C value. */
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73 struct md_constant *def;
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74 };
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75
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76 /* This structure represents an enum defined by define_enum or the like. */
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77 struct enum_type {
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78 /* The C name of the enumeration. */
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79 char *name;
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80
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81 /* True if this is an md-style enum (DEFINE_ENUM) rather than
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82 a C-style enum (DEFINE_C_ENUM). */
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83 bool md_p;
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84
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85 /* The values of the enumeration. There is always at least one. */
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86 struct enum_value *values;
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87
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88 /* A pointer to the null terminator in VALUES. */
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89 struct enum_value **tail_ptr;
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90
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91 /* The number of enumeration values. */
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92 unsigned int num_values;
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93 };
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94
131
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95 /* Describes one instance of an overloaded_name. */
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96 struct overloaded_instance {
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97 /* The next instance in the chain, or null if none. */
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98 overloaded_instance *next;
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99
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100 /* The values that the overloaded_name arguments should have for this
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101 instance to be chosen. Each value is a C token. */
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102 vec<const char *> arg_values;
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103
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104 /* The full (non-overloaded) name of the pattern. */
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105 const char *name;
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106
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107 /* The corresponding define_expand or define_insn. */
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108 rtx insn;
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109 };
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110
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111 /* Describes a define_expand or define_insn whose name was preceded by '@'.
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112 Overloads are uniquely determined by their name and the types of their
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113 arguments; it's possible to have overloads with the same name but
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114 different argument types. */
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115 struct overloaded_name {
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116 /* The next overloaded name in the chain. */
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117 overloaded_name *next;
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118
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119 /* The overloaded name (i.e. the name with "@" character and
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120 "<...>" placeholders removed). */
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121 const char *name;
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122
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123 /* The C types of the iterators that determine the underlying pattern,
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124 in the same order as in the pattern name. E.g. "<mode>" in the
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125 pattern name would give a "machine_mode" argument here. */
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126 vec<const char *> arg_types;
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127
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128 /* The first instance associated with this overloaded_name. */
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129 overloaded_instance *first_instance;
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130
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131 /* Where to chain new overloaded_instances. */
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132 overloaded_instance **next_instance_ptr;
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133 };
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134
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135 struct mapping;
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136
111
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137 /* A class for reading .md files and RTL dump files.
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138
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139 Implemented in read-md.c.
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140
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141 This class has responsibility for reading chars from input files, and
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142 for certain common top-level directives including the "include"
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143 directive.
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144
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145 It does not handle parsing the hierarchically-nested expressions of
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146 rtl.def; for that see the rtx_reader subclass below (implemented in
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147 read-rtl.c). */
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148
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149 class md_reader
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150 {
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151 public:
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152 /* Associates PTR (which can be a string, etc.) with the file location
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153 specified by LOC. */
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154 struct ptr_loc {
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155 const void *ptr;
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156 file_location loc;
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157 };
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158
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159 md_reader (bool compact);
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160 virtual ~md_reader ();
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161
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162 bool read_md_files (int, const char **, bool (*) (const char *));
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163 bool read_file (const char *filename);
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164 bool read_file_fragment (const char *filename,
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165 int first_line,
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166 int last_line);
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167
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168 /* A hook that handles a single .md-file directive, up to but not
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169 including the closing ')'. It takes two arguments: the file position
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170 at which the directive started, and the name of the directive. The next
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171 unread character is the optional space after the directive name. */
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172 virtual void handle_unknown_directive (file_location, const char *) = 0;
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173
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174 file_location get_current_location () const;
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175
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176 bool is_compact () const { return m_compact; }
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177
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178 /* Defined in read-md.c. */
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179 int read_char (void);
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180 void unread_char (int ch);
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181 file_location read_name (struct md_name *name);
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182 file_location read_name_or_nil (struct md_name *);
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183 void read_escape ();
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184 char *read_quoted_string ();
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185 char *read_braced_string ();
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186 char *read_string (int star_if_braced);
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187 void read_skip_construct (int depth, file_location loc);
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188 void require_char (char expected);
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189 void require_char_ws (char expected);
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190 void require_word_ws (const char *expected);
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191 int peek_char (void);
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192
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193 void set_md_ptr_loc (const void *ptr, file_location);
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194 const struct ptr_loc *get_md_ptr_loc (const void *ptr);
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195 void copy_md_ptr_loc (const void *new_ptr, const void *old_ptr);
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196 void fprint_md_ptr_loc (FILE *outf, const void *ptr);
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197 void print_md_ptr_loc (const void *ptr);
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198
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199 struct enum_type *lookup_enum_type (const char *name);
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200 void traverse_enum_types (htab_trav callback, void *info);
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201
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202 void handle_constants ();
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203 void traverse_md_constants (htab_trav callback, void *info);
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204 void handle_enum (file_location loc, bool md_p);
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205
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206 const char *join_c_conditions (const char *cond1, const char *cond2);
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207 void fprint_c_condition (FILE *outf, const char *cond);
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208 void print_c_condition (const char *cond);
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209
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210 /* Defined in read-rtl.c. */
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211 const char *apply_iterator_to_string (const char *string);
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212 rtx copy_rtx_for_iterators (rtx original);
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213 void read_conditions ();
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214 void record_potential_iterator_use (struct iterator_group *group,
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215 file_location loc, rtx x,
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216 unsigned int index, const char *name);
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217 struct mapping *read_mapping (struct iterator_group *group, htab_t table);
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218 overloaded_name *handle_overloaded_name (rtx, vec<mapping *> *);
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219
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220 const char *get_top_level_filename () const { return m_toplevel_fname; }
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221 const char *get_filename () const { return m_read_md_filename; }
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222 int get_lineno () const { return m_read_md_lineno; }
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223 int get_colno () const { return m_read_md_colno; }
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224
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225 struct obstack *get_string_obstack () { return &m_string_obstack; }
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226 htab_t get_md_constants () { return m_md_constants; }
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227
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228 overloaded_name *get_overloads () const { return m_first_overload; }
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229
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230 private:
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231 /* A singly-linked list of filenames. */
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232 struct file_name_list {
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233 struct file_name_list *next;
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234 const char *fname;
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235 };
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236
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237 private:
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238 void handle_file ();
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239 void handle_toplevel_file ();
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240 void handle_include (file_location loc);
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241 void add_include_path (const char *arg);
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242
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243 bool read_name_1 (struct md_name *name, file_location *out_loc);
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244
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245 private:
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246 /* Are we reading a compact dump? */
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247 bool m_compact;
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248
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249 /* The name of the toplevel file that indirectly included
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250 m_read_md_file. */
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251 const char *m_toplevel_fname;
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252
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253 /* The directory part of m_toplevel_fname
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254 NULL if m_toplevel_fname is a bare filename. */
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255 char *m_base_dir;
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256
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257 /* The file we are reading. */
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258 FILE *m_read_md_file;
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259
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260 /* The filename of m_read_md_file. */
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261 const char *m_read_md_filename;
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262
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263 /* The current line number in m_read_md_file. */
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264 int m_read_md_lineno;
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265
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266 /* The current column number in m_read_md_file. */
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267 int m_read_md_colno;
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268
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269 /* The column number before the last newline, so that
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270 we can handle unread_char ('\n') at least once whilst
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271 retaining column information. */
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272 int m_last_line_colno;
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273
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274 /* The first directory to search. */
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275 file_name_list *m_first_dir_md_include;
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276
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277 /* A pointer to the null terminator of the md include chain. */
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278 file_name_list **m_last_dir_md_include_ptr;
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279
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280 /* Obstack used for allocating MD strings. */
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281 struct obstack m_string_obstack;
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282
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283 /* A table of ptr_locs, hashed on the PTR field. */
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284 htab_t m_ptr_locs;
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285
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286 /* An obstack for the above. Plain xmalloc is a bit heavyweight for a
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287 small structure like ptr_loc. */
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288 struct obstack m_ptr_loc_obstack;
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289
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290 /* A hash table of triples (A, B, C), where each of A, B and C is a condition
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291 and A is equivalent to "B && C". This is used to keep track of the source
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292 of conditions that are made up of separate MD strings (such as the split
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293 condition of a define_insn_and_split). */
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294 htab_t m_joined_conditions;
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295
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296 /* An obstack for allocating joined_conditions entries. */
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297 struct obstack m_joined_conditions_obstack;
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298
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diff changeset
299 /* A table of md_constant structures, hashed by name. Null if no
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300 constant expansion should occur. */
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301 htab_t m_md_constants;
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302
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303 /* A table of enum_type structures, hashed by name. */
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304 htab_t m_enum_types;
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305
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306 /* If non-zero, filter the input to just this subset of lines. */
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307 int m_first_line;
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308 int m_last_line;
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309
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310 /* The first overloaded_name. */
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311 overloaded_name *m_first_overload;
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312
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313 /* Where to chain further overloaded_names, */
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314 overloaded_name **m_next_overload_ptr;
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315
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316 /* A hash table of overloaded_names, keyed off their name and the types of
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317 their arguments. */
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318 htab_t m_overloads_htab;
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319 };
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320
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321 /* Global singleton; constrast with rtx_reader_ptr below. */
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322 extern md_reader *md_reader_ptr;
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323
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324 /* An md_reader subclass which skips unknown directives, for
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325 the gen* tools that purely use read-md.o. */
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326
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327 class noop_reader : public md_reader
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328 {
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329 public:
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330 noop_reader () : md_reader (false) {}
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331
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332 /* A dummy implementation which skips unknown directives. */
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333 void handle_unknown_directive (file_location, const char *);
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334 };
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335
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336 /* An md_reader subclass that actually handles full hierarchical
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337 rtx expressions.
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338
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339 Implemented in read-rtl.c. */
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340
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341 class rtx_reader : public md_reader
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342 {
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343 public:
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344 rtx_reader (bool compact);
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345 ~rtx_reader ();
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346
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347 bool read_rtx (const char *rtx_name, vec<rtx> *rtxen);
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348 rtx rtx_alloc_for_name (const char *);
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349 rtx read_rtx_code (const char *code_name);
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350 virtual rtx read_rtx_operand (rtx return_rtx, int idx);
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351 rtx read_nested_rtx ();
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352 rtx read_rtx_variadic (rtx form);
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diff changeset
353 char *read_until (const char *terminator_chars, bool consume_terminator);
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354
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355 virtual void handle_any_trailing_information (rtx) {}
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diff changeset
356 virtual rtx postprocess (rtx x) { return x; }
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357
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358 /* Hook to allow function_reader subclass to put STRINGBUF into gc-managed
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359 memory, rather than within an obstack.
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360 This base class implementation is a no-op. */
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361 virtual const char *finalize_string (char *stringbuf) { return stringbuf; }
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362
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363 protected:
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diff changeset
364 /* Analogous to rtx_writer's m_in_call_function_usage. */
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diff changeset
365 bool m_in_call_function_usage;
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366
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367 /* Support for "reuse_rtx" directives. */
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diff changeset
368 auto_vec<rtx> m_reuse_rtx_by_id;
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369 };
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370
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diff changeset
371 /* Global singleton; constrast with md_reader_ptr above. */
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diff changeset
372 extern rtx_reader *rtx_reader_ptr;
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373
68
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374 extern void (*include_callback) (const char *);
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375
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parents:
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376 /* Read the next character from the MD file. */
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parents:
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377
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parents:
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378 static inline int
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379 read_char (void)
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380 {
111
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diff changeset
381 return md_reader_ptr->read_char ();
68
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382 }
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parents:
diff changeset
383
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parents:
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384 /* Put back CH, which was the last character read from the MD file. */
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385
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parents:
diff changeset
386 static inline void
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parents:
diff changeset
387 unread_char (int ch)
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parents:
diff changeset
388 {
111
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diff changeset
389 md_reader_ptr->unread_char (ch);
68
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parents:
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390 }
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parents:
diff changeset
391
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392 extern hashval_t leading_string_hash (const void *);
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393 extern int leading_string_eq_p (const void *, const void *);
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394 extern const char *join_c_conditions (const char *, const char *);
111
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diff changeset
395 extern void message_at (file_location, const char *, ...) ATTRIBUTE_PRINTF_2;
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diff changeset
396 extern void error_at (file_location, const char *, ...) ATTRIBUTE_PRINTF_2;
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diff changeset
397 extern void fatal_at (file_location, const char *, ...) ATTRIBUTE_PRINTF_2;
68
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398 extern void fatal_with_file_and_line (const char *, ...)
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399 ATTRIBUTE_PRINTF_1 ATTRIBUTE_NORETURN;
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400 extern void fatal_expected_char (int, int) ATTRIBUTE_NORETURN;
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parents:
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401 extern int read_skip_spaces (void);
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parents:
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402 extern int n_comma_elts (const char *);
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parents:
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403 extern const char *scan_comma_elt (const char **);
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parents:
diff changeset
404 extern void upcase_string (char *);
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parents:
diff changeset
405 extern void traverse_enum_types (htab_trav, void *);
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parents:
diff changeset
406 extern struct enum_type *lookup_enum_type (const char *);
111
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407
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diff changeset
408 #endif /* GCC_READ_MD_H */