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annotate lwcc/cc-main.c @ 499:c3099c5d9d3e

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Add very simple code generator This very simple code generator is definitely not the final form. It is simply a stop-gap for ongoing development.
author William Astle <lost@l-w.ca>
date Thu, 08 Aug 2019 23:48:18 -0600
parents a38542cf4cc6
children
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1 /*
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2 lwcc/cpp-main.c
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3
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4 Copyright © 2013 William Astle
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5
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6 This file is part of LWTOOLS.
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7
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8 LWTOOLS is free software: you can redistribute it and/or modify it under the
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9 terms of the GNU General Public License as published by the Free Software
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10 Foundation, either version 3 of the License, or (at your option) any later
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11 version.
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12
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13 This program is distributed in the hope that it will be useful, but WITHOUT
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14 ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
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15 FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License for
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16 more details.
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17
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18 You should have received a copy of the GNU General Public License along with
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19 this program. If not, see <http://www.gnu.org/licenses/>.
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20 */
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21
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22 #include <errno.h>
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23 #include <stdarg.h>
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24 #include <stdio.h>
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25 #include <stdlib.h>
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26 #include <string.h>
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27
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28 #include <lw_stringlist.h>
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29 #include <lw_cmdline.h>
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30 #include <lw_string.h>
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31
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32 #include <version.h>
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33
311
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34 #include "cpp.h"
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35 #include "tree.h"
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36
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37 node_t *process_file(const char *);
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38 static void do_error(const char *f, ...);
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39 extern node_t *parse_program(struct preproc_info *pp);
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40 extern void generate_code(node_t *n, FILE *of);
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41
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42 node_t *program_tree = NULL;
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43
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44 /* command line option handling */
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45 #define PROGVER "lwcc-cc from " PACKAGE_STRING
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46 char *program_name;
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47
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48 /* input files */
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49 lw_stringlist_t input_files;
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50 lw_stringlist_t includedirs;
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51 lw_stringlist_t sysincludedirs;
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52 lw_stringlist_t macrolist;
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53
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54 /* various flags */
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55 int trigraphs = 0;
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56 char *output_file = NULL;
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57 FILE *output_fp = NULL;
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58
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59 static struct lw_cmdline_options options[] =
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60 {
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61 { "output", 'o', "FILE", 0, "Output to FILE"},
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62 { "include", 'i', "FILE", 0, "Pre-include FILE" },
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63 { "includedir", 'I', "PATH", 0, "Add entry to the user include path" },
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64 { "sincludedir", 'S', "PATH", 0, "Add entry to the system include path" },
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65 { "define", 'D', "SYM[=VAL]",0, "Automatically define SYM to be VAL (or 1)"},
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66 { "trigraphs", 0x100, NULL, 0, "Enable interpretation of trigraphs" },
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67 { 0 }
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68 };
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69
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70 static int parse_opts(int key, char *arg, void *state)
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71 {
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72 switch (key)
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73 {
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74 case 'o':
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75 if (output_file)
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76 do_error("Output file specified more than once.");
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77 output_file = arg;
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78 break;
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79
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80 case 0x100:
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81 trigraphs = 1;
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82 break;
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83
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84 case 'I':
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85 lw_stringlist_addstring(includedirs, arg);
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86 break;
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87
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88 case 'S':
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89 lw_stringlist_addstring(sysincludedirs, arg);
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90 break;
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91
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92 case 'D':
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93 lw_stringlist_addstring(macrolist, arg);
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94 break;
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95
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96 case lw_cmdline_key_end:
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97 break;
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98
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99 case lw_cmdline_key_arg:
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100 lw_stringlist_addstring(input_files, arg);
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101 break;
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102
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103 default:
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104 return lw_cmdline_err_unknown;
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105 }
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106 return 0;
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107 }
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108
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109 static struct lw_cmdline_parser cmdline_parser =
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110 {
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111 options,
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112 parse_opts,
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113 "INPUTFILE",
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114 "lwcc-cc - C compiler for lwcc",
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115 PROGVER
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116 };
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117
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118 int main(int argc, char **argv)
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119 {
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120 program_name = argv[0];
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121 int retval = 0;
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122 node_t *n;
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123
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124 input_files = lw_stringlist_create();
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125 includedirs = lw_stringlist_create();
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126 sysincludedirs = lw_stringlist_create();
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127 macrolist = lw_stringlist_create();
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128
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129 /* parse command line arguments */
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130 lw_cmdline_parse(&cmdline_parser, argc, argv, 0, 0, NULL);
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131
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132 /* set up output file */
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133 if (output_file == NULL || strcmp(output_file, "-") == 0)
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134 {
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135 output_fp = stdout;
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136 }
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137 else
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138 {
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139 output_fp = fopen(output_file, "wb");
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140 if (output_fp == NULL)
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141 {
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142 do_error("Failed to create output file %s: %s", output_file, strerror(errno));
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143 }
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144 }
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145
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146 program_tree = node_create(NODE_PROGRAM);
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147
311
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148 if (lw_stringlist_nstrings(input_files) == 0)
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149 {
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150 /* if no input files, work on stdin */
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151 n = process_file("-");
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152 if (!n)
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153 retval = 1;
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154 else
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155 node_addchild(program_tree, n);
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156 }
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157 else
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158 {
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159 char *s;
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160 lw_stringlist_reset(input_files);
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161 for (s = lw_stringlist_current(input_files); s; s = lw_stringlist_next(input_files))
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162 {
312
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163 n = process_file(s);
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164 if (!n)
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165 retval = 1;
311
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166 if (retval != 0)
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167 break;
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168 node_addchild(program_tree, n);
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169 }
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170 }
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171 lw_stringlist_destroy(input_files);
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172 lw_stringlist_destroy(includedirs);
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173 lw_stringlist_destroy(sysincludedirs);
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174 lw_stringlist_destroy(macrolist);
312
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175
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176 node_display(program_tree, stdout);
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177
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178 // generate output
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179 generate_code(program_tree, output_fp);
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180
312
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181 node_destroy(program_tree);
311
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182 exit(retval);
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183 }
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184
312
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185 node_t *process_file(const char *fn)
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186 {
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187 struct preproc_info *pp;
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188 char *tstr;
312
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189 node_t *n;
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190
311
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191 pp = preproc_init(fn);
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192 if (!pp)
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193 return NULL;
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194
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195 /* set up the include paths */
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196 lw_stringlist_reset(includedirs);
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197 for (tstr = lw_stringlist_current(includedirs); tstr; tstr = lw_stringlist_next(includedirs))
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198 {
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199 preproc_add_include(pp, tstr, 0);
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200 }
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201
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202 lw_stringlist_reset(sysincludedirs);
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203 for (tstr = lw_stringlist_current(sysincludedirs); tstr; tstr = lw_stringlist_next(sysincludedirs))
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204 {
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205 preproc_add_include(pp, tstr, 1);
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206 }
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207
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208 /* set up pre-defined macros */
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209 lw_stringlist_reset(macrolist);
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210 for (tstr = lw_stringlist_current(macrolist); tstr; tstr = lw_stringlist_next(macrolist))
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211 {
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212 preproc_add_macro(pp, tstr);
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213 }
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214
312
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215 n = parse_program(pp);
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216 preproc_finish(pp);
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217
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218 return n;
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219 }
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220
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221 static void do_error(const char *f, ...)
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222 {
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223 va_list args;
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224 va_start(args, f);
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225 fprintf(stderr, "ERROR: ");
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226 vfprintf(stderr, f, args);
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227 va_end(args);
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228 fprintf(stderr, "\n");
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229 exit(1);
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230 }