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annotate gcc/read-md.h @ 138:fc828634a951

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author Shinji KONO <kono@ie.u-ryukyu.ac.jp>
date Thu, 08 Nov 2018 14:17:14 +0900
parents 84e7813d76e9
children 1830386684a0
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1 /* MD reader definitions.
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2 Copyright (C) 1987-2018 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 struct file_location {
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27 file_location () {}
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28 file_location (const char *, int, int);
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29
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30 const char *filename;
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31 int lineno;
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32 int colno;
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33 };
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34
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35 inline file_location::file_location (const char *filename_in, int lineno_in, int colno_in)
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36 : filename (filename_in), lineno (lineno_in), colno (colno_in) {}
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37
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38 /* Holds one symbol or number in the .md file. */
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39 struct md_name {
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40 /* The name as it appeared in the .md file. Names are syntactically
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41 limited to the length of this buffer. */
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42 char buffer[256];
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43
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44 /* The name that should actually be used by the generator programs.
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45 This is an expansion of NAME, after things like constant substitution. */
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46 char *string;
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47 };
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48
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49 /* This structure represents a constant defined by define_constant,
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50 define_enum, or such-like. */
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51 struct md_constant {
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52 /* The name of the constant. */
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53 char *name;
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54
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55 /* The string to which the constants expands. */
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56 char *value;
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57
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58 /* If the constant is associated with a enumeration, this field
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59 points to that enumeration, otherwise it is null. */
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60 struct enum_type *parent_enum;
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61 };
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62
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63 /* This structure represents one value in an enum_type. */
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64 struct enum_value {
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65 /* The next value in the enum, or null if this is the last. */
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66 struct enum_value *next;
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67
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68 /* The name of the value as it appears in the .md file. */
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69 char *name;
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70
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71 /* The definition of the related C value. */
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72 struct md_constant *def;
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73 };
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74
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75 /* This structure represents an enum defined by define_enum or the like. */
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76 struct enum_type {
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77 /* The C name of the enumeration. */
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78 char *name;
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79
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80 /* True if this is an md-style enum (DEFINE_ENUM) rather than
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81 a C-style enum (DEFINE_C_ENUM). */
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82 bool md_p;
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83
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84 /* The values of the enumeration. There is always at least one. */
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85 struct enum_value *values;
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86
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87 /* A pointer to the null terminator in VALUES. */
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88 struct enum_value **tail_ptr;
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89
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90 /* The number of enumeration values. */
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91 unsigned int num_values;
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92 };
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93
131
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94 /* Describes one instance of an overloaded_name. */
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95 struct overloaded_instance {
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96 /* The next instance in the chain, or null if none. */
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97 overloaded_instance *next;
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98
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99 /* The values that the overloaded_name arguments should have for this
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100 instance to be chosen. Each value is a C token. */
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101 vec<const char *> arg_values;
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102
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103 /* The full (non-overloaded) name of the pattern. */
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104 const char *name;
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105
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106 /* The corresponding define_expand or define_insn. */
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107 rtx insn;
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108 };
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109
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110 /* Describes a define_expand or define_insn whose name was preceded by '@'.
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111 Overloads are uniquely determined by their name and the types of their
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112 arguments; it's possible to have overloads with the same name but
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113 different argument types. */
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114 struct overloaded_name {
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115 /* The next overloaded name in the chain. */
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116 overloaded_name *next;
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117
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118 /* The overloaded name (i.e. the name with "@" character and
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119 "<...>" placeholders removed). */
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120 const char *name;
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121
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122 /* The C types of the iterators that determine the underlying pattern,
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123 in the same order as in the pattern name. E.g. "<mode>" in the
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124 pattern name would give a "machine_mode" argument here. */
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125 vec<const char *> arg_types;
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126
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127 /* The first instance associated with this overloaded_name. */
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128 overloaded_instance *first_instance;
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129
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130 /* Where to chain new overloaded_instances. */
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131 overloaded_instance **next_instance_ptr;
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132 };
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133
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134 struct mapping;
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135
111
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136 /* A class for reading .md files and RTL dump files.
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137
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138 Implemented in read-md.c.
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139
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140 This class has responsibility for reading chars from input files, and
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141 for certain common top-level directives including the "include"
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142 directive.
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143
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144 It does not handle parsing the hierarchically-nested expressions of
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145 rtl.def; for that see the rtx_reader subclass below (implemented in
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146 read-rtl.c). */
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147
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148 class md_reader
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149 {
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150 public:
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151 md_reader (bool compact);
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152 virtual ~md_reader ();
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153
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154 bool read_md_files (int, const char **, bool (*) (const char *));
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155 bool read_file (const char *filename);
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156 bool read_file_fragment (const char *filename,
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157 int first_line,
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158 int last_line);
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159
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160 /* A hook that handles a single .md-file directive, up to but not
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161 including the closing ')'. It takes two arguments: the file position
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162 at which the directive started, and the name of the directive. The next
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163 unread character is the optional space after the directive name. */
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164 virtual void handle_unknown_directive (file_location, const char *) = 0;
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165
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166 file_location get_current_location () const;
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167
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168 bool is_compact () const { return m_compact; }
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169
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170 /* Defined in read-md.c. */
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171 int read_char (void);
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172 void unread_char (int ch);
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173 file_location read_name (struct md_name *name);
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174 file_location read_name_or_nil (struct md_name *);
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175 void read_escape ();
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176 char *read_quoted_string ();
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177 char *read_braced_string ();
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178 char *read_string (int star_if_braced);
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179 void read_skip_construct (int depth, file_location loc);
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180 void require_char (char expected);
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181 void require_char_ws (char expected);
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182 void require_word_ws (const char *expected);
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183 int peek_char (void);
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184
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185 void set_md_ptr_loc (const void *ptr, const char *filename, int lineno);
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186 const struct ptr_loc *get_md_ptr_loc (const void *ptr);
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187 void copy_md_ptr_loc (const void *new_ptr, const void *old_ptr);
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188 void fprint_md_ptr_loc (FILE *outf, const void *ptr);
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189 void print_md_ptr_loc (const void *ptr);
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190
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191 struct enum_type *lookup_enum_type (const char *name);
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192 void traverse_enum_types (htab_trav callback, void *info);
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193
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194 void handle_constants ();
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195 void traverse_md_constants (htab_trav callback, void *info);
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196 void handle_enum (file_location loc, bool md_p);
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197
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198 const char *join_c_conditions (const char *cond1, const char *cond2);
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199 void fprint_c_condition (FILE *outf, const char *cond);
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200 void print_c_condition (const char *cond);
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201
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202 /* Defined in read-rtl.c. */
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203 const char *apply_iterator_to_string (const char *string);
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204 rtx copy_rtx_for_iterators (rtx original);
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205 void read_conditions ();
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206 void record_potential_iterator_use (struct iterator_group *group,
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207 rtx x, unsigned int index,
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208 const char *name);
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209 struct mapping *read_mapping (struct iterator_group *group, htab_t table);
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210 overloaded_name *handle_overloaded_name (rtx, vec<mapping *> *);
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211
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212 const char *get_top_level_filename () const { return m_toplevel_fname; }
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213 const char *get_filename () const { return m_read_md_filename; }
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214 int get_lineno () const { return m_read_md_lineno; }
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215 int get_colno () const { return m_read_md_colno; }
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216
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217 struct obstack *get_string_obstack () { return &m_string_obstack; }
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218 htab_t get_md_constants () { return m_md_constants; }
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219
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220 overloaded_name *get_overloads () const { return m_first_overload; }
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221
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222 private:
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223 /* A singly-linked list of filenames. */
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224 struct file_name_list {
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225 struct file_name_list *next;
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226 const char *fname;
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227 };
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228
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229 private:
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230 void handle_file ();
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231 void handle_toplevel_file ();
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232 void handle_include (file_location loc);
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233 void add_include_path (const char *arg);
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234
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235 bool read_name_1 (struct md_name *name, file_location *out_loc);
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236
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237 private:
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238 /* Are we reading a compact dump? */
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239 bool m_compact;
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240
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241 /* The name of the toplevel file that indirectly included
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242 m_read_md_file. */
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243 const char *m_toplevel_fname;
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244
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245 /* The directory part of m_toplevel_fname
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246 NULL if m_toplevel_fname is a bare filename. */
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247 char *m_base_dir;
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248
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249 /* The file we are reading. */
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250 FILE *m_read_md_file;
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251
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252 /* The filename of m_read_md_file. */
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253 const char *m_read_md_filename;
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254
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255 /* The current line number in m_read_md_file. */
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256 int m_read_md_lineno;
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257
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258 /* The current column number in m_read_md_file. */
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259 int m_read_md_colno;
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260
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261 /* The column number before the last newline, so that
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262 we can handle unread_char ('\n') at least once whilst
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263 retaining column information. */
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264 int m_last_line_colno;
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265
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266 /* The first directory to search. */
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267 file_name_list *m_first_dir_md_include;
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268
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269 /* A pointer to the null terminator of the md include chain. */
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270 file_name_list **m_last_dir_md_include_ptr;
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271
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272 /* Obstack used for allocating MD strings. */
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273 struct obstack m_string_obstack;
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274
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275 /* A table of ptr_locs, hashed on the PTR field. */
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276 htab_t m_ptr_locs;
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277
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278 /* An obstack for the above. Plain xmalloc is a bit heavyweight for a
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279 small structure like ptr_loc. */
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280 struct obstack m_ptr_loc_obstack;
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281
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282 /* A hash table of triples (A, B, C), where each of A, B and C is a condition
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283 and A is equivalent to "B && C". This is used to keep track of the source
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284 of conditions that are made up of separate MD strings (such as the split
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285 condition of a define_insn_and_split). */
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286 htab_t m_joined_conditions;
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287
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288 /* An obstack for allocating joined_conditions entries. */
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289 struct obstack m_joined_conditions_obstack;
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290
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291 /* A table of md_constant structures, hashed by name. Null if no
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292 constant expansion should occur. */
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293 htab_t m_md_constants;
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294
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295 /* A table of enum_type structures, hashed by name. */
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296 htab_t m_enum_types;
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297
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298 /* If non-zero, filter the input to just this subset of lines. */
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299 int m_first_line;
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300 int m_last_line;
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301
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302 /* The first overloaded_name. */
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303 overloaded_name *m_first_overload;
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304
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305 /* Where to chain further overloaded_names, */
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306 overloaded_name **m_next_overload_ptr;
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307
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308 /* A hash table of overloaded_names, keyed off their name and the types of
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309 their arguments. */
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310 htab_t m_overloads_htab;
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311 };
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312
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313 /* Global singleton; constrast with rtx_reader_ptr below. */
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314 extern md_reader *md_reader_ptr;
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315
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316 /* An md_reader subclass which skips unknown directives, for
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317 the gen* tools that purely use read-md.o. */
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318
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319 class noop_reader : public md_reader
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320 {
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321 public:
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322 noop_reader () : md_reader (false) {}
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323
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324 /* A dummy implementation which skips unknown directives. */
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325 void handle_unknown_directive (file_location, const char *);
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326 };
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327
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328 /* An md_reader subclass that actually handles full hierarchical
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329 rtx expressions.
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330
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331 Implemented in read-rtl.c. */
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332
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333 class rtx_reader : public md_reader
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334 {
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335 public:
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336 rtx_reader (bool compact);
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337 ~rtx_reader ();
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338
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339 bool read_rtx (const char *rtx_name, vec<rtx> *rtxen);
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340 rtx read_rtx_code (const char *code_name);
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341 virtual rtx read_rtx_operand (rtx return_rtx, int idx);
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342 rtx read_nested_rtx ();
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343 rtx read_rtx_variadic (rtx form);
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344 char *read_until (const char *terminator_chars, bool consume_terminator);
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345
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346 virtual void handle_any_trailing_information (rtx) {}
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347 virtual rtx postprocess (rtx x) { return x; }
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348
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349 /* Hook to allow function_reader subclass to put STRINGBUF into gc-managed
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350 memory, rather than within an obstack.
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351 This base class implementation is a no-op. */
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352 virtual const char *finalize_string (char *stringbuf) { return stringbuf; }
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353
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354 protected:
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355 /* Analogous to rtx_writer's m_in_call_function_usage. */
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356 bool m_in_call_function_usage;
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357
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358 /* Support for "reuse_rtx" directives. */
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359 auto_vec<rtx> m_reuse_rtx_by_id;
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360 };
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361
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362 /* Global singleton; constrast with md_reader_ptr above. */
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363 extern rtx_reader *rtx_reader_ptr;
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364
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365 extern void (*include_callback) (const char *);
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366
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367 /* Read the next character from the MD file. */
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368
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369 static inline int
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370 read_char (void)
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371 {
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372 return md_reader_ptr->read_char ();
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373 }
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374
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375 /* Put back CH, which was the last character read from the MD file. */
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376
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377 static inline void
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378 unread_char (int ch)
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379 {
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380 md_reader_ptr->unread_char (ch);
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381 }
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382
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383 extern hashval_t leading_string_hash (const void *);
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384 extern int leading_string_eq_p (const void *, const void *);
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385 extern const char *join_c_conditions (const char *, const char *);
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386 extern void message_at (file_location, const char *, ...) ATTRIBUTE_PRINTF_2;
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387 extern void error_at (file_location, const char *, ...) ATTRIBUTE_PRINTF_2;
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388 extern void fatal_at (file_location, const char *, ...) ATTRIBUTE_PRINTF_2;
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389 extern void fatal_with_file_and_line (const char *, ...)
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390 ATTRIBUTE_PRINTF_1 ATTRIBUTE_NORETURN;
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391 extern void fatal_expected_char (int, int) ATTRIBUTE_NORETURN;
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392 extern int read_skip_spaces (void);
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393 extern int n_comma_elts (const char *);
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394 extern const char *scan_comma_elt (const char **);
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395 extern void upcase_string (char *);
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396 extern void traverse_enum_types (htab_trav, void *);
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397 extern struct enum_type *lookup_enum_type (const char *);
111
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398
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399 #endif /* GCC_READ_MD_H */