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61
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1 /* Micro-C Generic Code Generatation Part */
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2 /* $Id$ */
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3
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4 #define EXTERN extern
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5 #include "mc.h"
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6 #include "mc-codegen.h"
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7 #include "mc-code.h"
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8
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9 int creg; /* current register */
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10 int dreg; /* temporary register */
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11 int reg_sp; /* REGister Stack-Pointer */
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12
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13 /*
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14 creg currrent virtual register
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15 dreg spare virtual register
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16
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17 rname[creg] currrent real register
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18 rname[dreg] spare real register
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19
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20 regs[] virtual register usage
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21 regv[] value in virtual register flag
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22
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23 reg_name[rname[creg]]
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24 */
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25
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26 void remove0(int *parent,int e) ;
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27 void remove0_all(int *parent,int e) ;
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28 int is_same_type(int e1,int e2);
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29 void jump(int e1, int env);
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30 void machinop(int e1);
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31 void sassign(int e1);
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32 void assign(int e1);
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33 void assop(int e1);
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34
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35 int
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36 get_register(void)
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37 { /* 使われていないレジスタを調べる */
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38 int i;
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39 for(i=0;i<MAX_REGISTER;i++) {
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40 if (! regs[i]) { /* 使われていないなら */
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41 regs[i]=1; /* そのレジスタを使うことを宣言し */
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42 return i; /* その場所を表す番号を返す */
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43 }
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44 }
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45 return -1; /* 空いている場所がないなら、それを表す -1 を返す */
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46 }
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47
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48 void
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49 free_register(int i) { /* いらなくなったレジスタを開放 */
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50 regv[i]=regs[i]=0;
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51 }
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52
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53 int
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54 register_full(void)
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55 {
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56 int i;
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57 for(i=0;i<MAX_REGISTER;i++) {
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58 if (! regs[i]) {
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59 return 0;
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60 }
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61 }
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62 return 1;
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63 }
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64
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65 int
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66 free_register_count(void)
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67 {
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68 int i,count;
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69 count = 0;
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70 for(i=0;i<MAX_REGISTER;i++) {
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71 if (! regs[i] && ! regv[i]) count++;
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72 }
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73 return count;
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74 }
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75
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76 void
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77 free_all_register(void)
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78 {
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79 int i;
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80 for(i=0;i<MAX_REGISTER;i++) {
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81 regs[i]=regv[i]=0;
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82 }
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83 creg = get_register();
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84 dreg = get_register();
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85 return;
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86 }
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87
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88 void
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89 use_register_var(int i) {
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90 regv[i]=1;
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91 }
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92
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93 int creg_regvar = -1;
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94 static int creg_regvar_back;
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95 static int creg_back;
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96
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97 void
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98 creg_destroy() {
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99 creg_back = creg; creg_regvar_back = creg_regvar;
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100 if (creg_regvar>=0)
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101 creg = creg_regvar;
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102 creg_regvar=-1;
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103 }
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104
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105 void
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106 creg_un_destroy() {
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107 creg = creg_back; creg_regvar = creg_regvar_back;
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108 }
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109
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110 void
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111 register_usage(char *s)
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112 {
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113 int i;
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66
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114 if (chk) return;
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61
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115 printf("# %d: %s:",lineno,s);
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116 printf(" creg=%s dreg=%s ",register_name(creg,0),register_name(dreg,0));
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117 for(i=0;i<MAX_REGISTER;i++) {
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118 printf("%d",regs[i]);
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119 }
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120 printf(":");
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121 for(i=0;i<MAX_REGISTER;i++) {
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122 printf("%d",regv[i]);
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123 }
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124 #if 0
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125 printf(" regs_stack",register_name(creg,0),register_name(dreg,0));
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126 for(i=reg_sp;i>=0;i--) {
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127 if(reg_stack[i]>=0)
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128 printf(" %s",register_name(reg_stack[i],0));
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129 }
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130 #endif
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131 printf("\n");
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132 }
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133
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134 void
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135 gexpr_init(void)
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136 {
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137 while(reg_sp > 0) {
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138 free_register(reg_stack[--reg_sp]);
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139 }
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140 text_mode();
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141 gexpr_code_init();
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142 register_usage("gexpr_init");
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143 }
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144
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145
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146 void
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147 emit_init(void)
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148 {
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149 int i;
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150 for(i=0;i<MAX_REGISTER;i++) { regs[i]=0; regv[i]=0;rname[i]=i;}
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151 free_all_register();
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152 reg_sp = 0;
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153 text_mode();
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154 }
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155
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156 int
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157 virtual(int real)
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158 {
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159 int real_v,i;
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160 real_v = -1;
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161 for(i=0;i<MAX_REGISTER;i++) {
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162 if (rname[i]==real) {
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163 real_v=i;
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164 break;
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165 }
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166 }
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167 return real_v;
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168 }
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169
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170 int
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171 pop_register(void)
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172 { /* レジスタから値を取り出す */
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173 return reg_stack[--reg_sp];
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174 }
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175
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176 int
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177 stack_used(void) {
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178 return reg_stack[--reg_sp]<0;
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179 }
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180
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181 void
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182 emit_pop_free(int xreg)
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183 {
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184 if (xreg==dreg) {
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185 regv[dreg]=0;
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186 } else if (xreg!=-1) {
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187 free_register(xreg);
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188 }
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189 }
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190
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191 void
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192 gexpr(int e1)
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193 {
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66
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194 if (chk) return;
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61
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195 gexpr_init();
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196 #if 0
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197 if(lineno==2862) {
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198 g_expr(e1); /*break here*/
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199 return;
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200 }
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201 #endif
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202 g_expr(e1);
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203 }
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204
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205 int
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206 csvalue()
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207 {
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208 return rname[creg]; /* for switch value */
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209 }
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210
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211 void
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212 g_expr(int e1)
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213 {
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214 int e2,e3/*,e4*/;
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215 NMTBL *n;
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216
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217 e2 = cadr(e1);
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218 switch (car(e1)){
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219 case GVAR:
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220 code_gvar(e1);
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221 regv[creg]=1;
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222 return;
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223 case RGVAR:
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224 code_rgvar(e1);
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225 regv[creg]=1;
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226 return;
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227 case CRGVAR:
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228 code_crgvar(e1);
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229 regv[creg]=1;
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230 return;
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231 case LVAR:
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232 code_lvar(lvar(e2));
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233 regv[creg]=1;
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234 return;
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235 case REGISTER:
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236 /* this is of course redundant... */
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237 /* we can use rname for this? */
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238 /* or why not creg=e2? */
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239 code_register(e2);
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240 regv[creg]=1;
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241 return;
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242 case RLVAR:
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243 code_rlvar(lvar(e2));
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244 regv[creg]=1;
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245 return;
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246 case CRLVAR:
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247 code_crlvar(lvar(e2));
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248 regv[creg]=1;
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249 return;
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250 case FNAME:
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251 code_fname(((NMTBL *)(e2))->nm);
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252 regv[creg]=1;
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253 return;
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254 case CONST: /* 代入する値が0でも特別な処理はしない */
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255 code_const(e2);
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256 regv[creg]=1;
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257 return;
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258 case STRING:
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259 string(e1);
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260 regv[creg]=1;
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261 return;
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262 case FUNCTION:
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263 function(e1);
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264 regv[creg]=1;
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265 return;
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266 case CODE:
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267 jump(e2,caddr(e1));
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268 return;
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269 case INDIRECT:
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270 g_expr(e2);
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271 return;
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272 case RINDIRECT: case CRINDIRECT:
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273 rindirect(e1);
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274 return;
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275 case ADDRESS:
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276 g_expr(e2);
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277 return;
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278 case MINUS: /* レジスタに対し、neglを実行すれば実現可能 */
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279 g_expr(e2);
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280 code_neg();
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281 return;
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282 case BNOT: /* ~ */
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283 g_expr(e2);
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284 code_not();
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285 return;
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286 case LNOT: /* ! */
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287 g_expr(e2);
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288 code_lnot();
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289 return;
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290 case PREINC:
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291 code_preinc(e1,e2);
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292 return;
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293 case POSTINC:
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294 code_postinc(e1,e2);
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295 return;
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296 case CPOSTINC:
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297 /* char *p; *p++ */
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298 code_cpostinc(e1,e2);
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299 return;
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300 case CPREINC:
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301 code_cpreinc(e1,e2);
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302 return;
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303 case CPOSTDEC:
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304 code_cpostdec(e1,e2);
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305 return;
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306 case CPREDEC:
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307 code_cpredec(e1,e2);
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308 return;
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309 case MUL: case UMUL:
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310 case DIV: case UDIV:
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311 case MOD: case UMOD:
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312 case LSHIFT: case ULSHIFT: case RSHIFT: case URSHIFT:
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313 case ADD: case SUB: case BAND: case EOR: case BOR:
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314 machinop(e1);
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315 return;
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316 case COND:
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317 e2=fwdlabel();
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318 b_expr(cadr(e1),0,e2,0);
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319 code_set_fixed_creg(0);
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320 g_expr(caddr(e1));
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321 /* e4 = rname[creg]; this is a bad idea */
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322 code_set_fixed_creg(1);
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323 jmp(e3=fwdlabel());
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324 fwddef(e2);
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325 code_set_fixed_creg(0);
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326 g_expr(cadddr(e1));
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327 code_set_fixed_creg(1);
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328 fwddef(e3);
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329 return;
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330 case SASS:
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331 sassign(e1);
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332 return;
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333 case ASS: case CASS:
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334 assign(e1);
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335 return;
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336 case ASSOP: case CASSOP:
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337 assop(e1);
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338 return;
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339 case RSTRUCT:
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340 g_expr(e2);
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341 return;
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342 case COMMA:
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343 g_expr(e2);
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344 g_expr(caddr(e1));
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345 return;
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346 case RETURN:
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347 n = (NMTBL *)e2;
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348 if (retcont==0)
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349 retcont=fwdlabel();
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350 code_return(creg);
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351 regv[creg]=1;
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352 return;
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353 case ENVIRONMENT:
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354 code_environment(creg);
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355 regv[creg]=1;
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356 return;
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357 default:
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358 code_bool(e1);
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359 regv[creg]=1;
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360 }
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361 }
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362
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363 void
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364 bexpr(int e1, char cond, int l1)
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365 {
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66
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366 if (chk) return;
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61
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367 gexpr_init();
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368 b_expr(e1,cond,l1,0);
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369 }
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370
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371 void
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372 b_expr(int e1, char cond, int l1,int err)
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373 {
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374 int e2,l2;
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375 e2=cadr(e1);
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376 switch(car(e1)) {
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377 case LNOT:
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378 b_expr(e2,!cond,l1,0);
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379 return;
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380 case GT:
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381 rexpr(e1,l1,code_gt(cond));
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382 return;
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383 case UGT:
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384 rexpr(e1,l1,code_ugt(cond));
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385 return;
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386 case GE:
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387 rexpr(e1,l1,code_ge(cond));
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388 return;
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389 case UGE:
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390 rexpr(e1,l1,code_uge(cond));
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391 return;
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392 case LT:
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393 rexpr(e1,l1,code_ge(!cond));
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394 return;
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395 case ULT:
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396 rexpr(e1,l1,code_uge(!cond));
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397 return;
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398 case LE:
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399 rexpr(e1,l1,code_gt(!cond));
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400 return;
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401 case ULE:
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402 rexpr(e1,l1,code_ugt(!cond));
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403 return;
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404 case EQ:
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405 rexpr(e1,l1,code_eq(cond));
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406 return;
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407 case NEQ:
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408 rexpr(e1,l1,code_eq(!cond));
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409 return;
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410 case LAND:
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411 b_expr(e2,0,cond?(l2=fwdlabel()):l1,0);
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412 b_expr(caddr(e1),cond,l1,0);
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413 if(cond) fwddef(l2);
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414 return;
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415 case LOR:
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416 b_expr(e2,1,cond?l1:(l2=fwdlabel()),0);
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417 b_expr(caddr(e1),cond,l1,0);
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418 if(!cond) fwddef(l2);
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419 return;
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420 case CRGVAR:
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421 code_cmp_crgvar(e1);
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422 jcond(l1,cond);
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423 return;
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424 case CRLVAR:
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425 code_cmp_crlvar(lvar(e2));
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426 jcond(l1,cond);
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427 return;
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428 case RGVAR:
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429 code_cmp_rgvar(e1);
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430 jcond(l1,cond);
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431 return;
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432 case RLVAR:
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433 code_cmp_rlvar(lvar(e2));
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434 jcond(l1,cond);
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435 return;
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436 case REGISTER:
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437 code_cmp_register(e2);
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438 jcond(l1,cond);
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439 return;
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440 case CONST:
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441 if((cond&&e2)||(!cond&&!e2)) jmp(l1);
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442 return;
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443 default:
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444 if(err) {
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445 error(-1); return; /* recursice g_expr/b_expr */
|
|
|
446 }
|
|
|
447 g_expr(e1);
|
|
|
448 code_cmp_register(creg);
|
|
|
449 jcond(l1,cond);
|
|
|
450 return;
|
|
|
451 }
|
|
|
452 }
|
|
|
453
|
|
|
454
|
|
|
455 /* goto arguments list */
|
|
|
456 /* target list4(list2(tag,disp),cdr,ty,source_expr) */
|
|
|
457 /* source expr=listn(tag,...) */
|
|
|
458 /* source (after) list2(tag,disp) */
|
|
|
459 /* source list list3(e,cdr,sz) */
|
|
|
460
|
|
|
461 #define DEBUG_PARALLEL_ASSIGN 1
|
|
|
462
|
|
|
463 int
|
|
|
464 overrap(int t,int sz,int source)
|
|
|
465 {
|
|
|
466 int s,s0,s1;
|
|
|
467 int t0=cadr(t);
|
|
|
468 int t1=t0+sz;
|
|
|
469 for(;source;source=cadr(source)) {
|
|
|
470 s=car(source); s0=cadr(s);
|
|
|
471 if(car(s)==REGISTER && car(t)==REGISTER) {
|
|
|
472 if(s0==t0) return s;
|
|
|
473 } else if (is_same_type(s,t)) {
|
|
|
474 s1=s0+caddr(source);
|
|
|
475 #if DEBUG_PARALLEL_ASSIGN>1
|
|
|
476 printf("# ovedrrap source %d t0 %d t1 %d\n",car(car(t)),t0,t1);
|
|
|
477 printf("# ovedrrap target %d s0 %d s1 %d\n",car(car(source)),s0,s1);
|
|
|
478 printf("# ovedrrap equal = %d\n",((t0<=s0&&s0<t1)||(t0<s1&&s1<=t1)));
|
|
|
479 #endif
|
|
|
480 if((t0<=s0&&s0<t1)||(t0<s1&&s1<=t1)) return s;
|
|
|
481 }
|
|
|
482 }
|
|
|
483 return 0;
|
|
|
484 }
|
|
|
485
|
|
|
486 void
|
|
|
487 remove_target(int *target,int t,int *use)
|
|
|
488 {
|
|
|
489 int use0=*use;
|
|
|
490 while(use0) {
|
|
|
491 if (car(use0)==t) {
|
|
|
492 free_register(caddr(use0));
|
|
|
493 break;
|
|
|
494 }
|
|
|
495 use0 = cadr(use0);
|
|
|
496 }
|
|
|
497 remove0(target,t);
|
|
|
498 }
|
|
|
499
|
|
|
500 void
|
|
|
501 save_target(int t,int s,int *target,int *use,int sz,int ty)
|
|
|
502 {
|
|
|
503 int e1;
|
|
|
504 /*新しいレジスタ(or スタック)を取得する*/
|
|
|
505 if (sz==size_of_int && (e1=get_register())!=-1) {
|
|
|
506 *use=list3(t,*use,e1);
|
|
|
507 e1=list2(REGISTER,e1);
|
|
|
508 g_expr(assign_expr0(e1,s,ty,ty));
|
|
|
509 *target = append4(*target,t,ty,e1);
|
|
|
510 } else {
|
|
|
511 disp-=sz;
|
|
|
512 g_expr(assign_expr0((e1=list2(LVAR,disp)),s,ty,ty));
|
|
|
513 *target = append4(*target,t,ty,e1);
|
|
|
514 }
|
|
|
515 }
|
|
|
516
|
|
|
517 int
|
|
|
518 circular_dependency(int t,int s,int *target,int *source)
|
|
|
519 {
|
|
|
520 int target0=*target;
|
|
|
521 int t1,sz,ty,s1;
|
|
|
522 while(target0) {
|
|
|
523 if (cadddr(target0)==s) {
|
|
|
524 t1=car(target0);
|
|
|
525 s=cadddr(target0);
|
|
|
526 sz=size(ty=caddr(target0));
|
|
|
527 if(t==t1) {
|
|
|
528 #if DEBUG_PARALLEL_ASSIGN
|
|
|
529 printf("# circular dependency %d ty %d+%d sz %d\n",car(t1),ty,cadr(t1),sz);
|
|
|
530 #endif
|
|
|
531 return 1;
|
|
|
532 }
|
|
|
533 if ((s1=overrap(t1,sz,*source))) {
|
|
|
534 /* another overrap start over */
|
|
|
535 return circular_dependency(t,s1,target,source);
|
|
|
536 }
|
|
|
537 }
|
|
|
538 target0=cadr(target0);
|
|
|
539 }
|
|
|
540 return 0;
|
|
|
541 }
|
|
|
542
|
|
|
543 void
|
|
|
544 parallel_assign(int *target,int *source,int *processing,int *use)
|
|
|
545 {
|
|
|
546 int t,s,sz,ty,target0,s1;
|
|
|
547 while(*target) {
|
|
|
548 target0=*target;
|
|
|
549 while(target0) {
|
|
|
550 t=car(target0); s=cadddr(target0);
|
|
|
551 sz=size(ty=caddr(target0));
|
|
|
552 if(car(t)==car(s) && cadr(t)==cadr(s)) {
|
|
|
553 /*書き込み先が自分自身*/
|
|
|
554 #if DEBUG_PARALLEL_ASSIGN
|
|
|
555 printf("# remove same %d ty %d+%d sz %d\n",car(t),ty,cadr(t),sz);
|
|
|
556 #endif
|
|
|
557 remove_target(target,t,use);
|
|
|
558 /* 破壊されては困るので、source listからは除かない */
|
|
|
559 } else if (!(s1=overrap(t,sz,*source))) {
|
|
|
560 /* 重なってないので安心して書き込める */
|
|
|
561 #if DEBUG_PARALLEL_ASSIGN
|
|
|
562 printf("# normal assign %d ty %d+%d sz %d\n",car(t),ty,cadr(t),sz);
|
|
|
563 #endif
|
|
|
564 g_expr(assign_expr0(t,s,ty,ty));
|
|
|
565 remove_target(target,t,use); remove0(source,s);
|
|
|
566 } else {
|
|
|
567 if(circular_dependency(t,s1,target,source)) {
|
|
|
568 #if DEBUG_PARALLEL_ASSIGN
|
|
|
569 printf("# saving %d ty %d+%d sz %d\n",car(t),ty,cadr(t),sz);
|
|
|
570 #endif
|
|
|
571 remove_target(target,t,use); remove0(source,s);
|
|
|
572 save_target(t,s,target,use,sz,ty);
|
|
|
573 }
|
|
|
574 }
|
|
|
575 target0=cadr(target0);
|
|
|
576 }
|
|
|
577 }
|
|
|
578 }
|
|
|
579
|
|
|
580 void
|
|
|
581 remove0(int *parent,int e)
|
|
|
582 {
|
|
|
583 int list;
|
|
|
584 while ((list=*parent)) {
|
|
|
585 if (car(list)==e) {
|
|
|
586 *parent= cadr(list); return;
|
|
|
587 } else {
|
|
|
588 parent=&cadr(list);
|
|
|
589 }
|
|
|
590 }
|
|
|
591 }
|
|
|
592
|
|
|
593 void
|
|
|
594 remove0_all(int *parent,int e)
|
|
|
595 {
|
|
|
596 int list;
|
|
|
597 while ((list=*parent)) {
|
|
|
598 if (car(list)==e) {
|
|
|
599 *parent= cadr(list);
|
|
|
600 } else {
|
|
|
601 parent=&cadr(list);
|
|
|
602 }
|
|
|
603 }
|
|
|
604 }
|
|
|
605
|
|
|
606 int
|
|
|
607 is_simple(int e1)
|
|
|
608 {
|
|
|
609 return (
|
|
|
610 e1==CONST || e1==FNAME || e1==LVAR || e1==REGISTER ||
|
|
|
611 e1==GVAR || e1==RGVAR || e1==RLVAR || e1==CRLVAR || e1==CRGVAR
|
|
|
612 );
|
|
|
613 }
|
|
|
614
|
|
|
615 int
|
|
|
616 is_same_type(int e1,int e2)
|
|
|
617 {
|
|
|
618 int ce1=car(e1);
|
|
|
619 int ce2=car(e2);
|
|
|
620 return (
|
|
|
621 (ce1==LVAR && (ce2==RLVAR||ce2==CRLVAR))
|
|
|
622 || (ce2==LVAR && (ce1==RLVAR||ce1==CRLVAR))
|
|
|
623 || (ce1==GVAR && (ce2==RGVAR||ce2==CRGVAR))
|
|
|
624 || (ce2==GVAR && (ce1==RGVAR||ce1==CRGVAR))
|
|
|
625 );
|
|
|
626 }
|
|
|
627
|
|
|
628 int
|
|
|
629 is_memory(int e1)
|
|
|
630 {
|
|
|
631 int ce1=car(e1);
|
|
|
632 return (
|
|
|
633 ce1==LVAR ||ce1==RLVAR||ce1==CRLVAR ||
|
|
|
634 ce1==GVAR ||ce1==RGVAR||ce1==CRGVAR ||
|
|
|
635 ce1==REGISTER
|
|
|
636 );
|
|
|
637 }
|
|
|
638
|
|
|
639 void
|
|
|
640 jump(int e1, int env)
|
|
|
641 {
|
|
|
642 int e2,e3,e4,sz,arg_size,ty,max_regs,regs;
|
|
|
643 int t0,s0;
|
|
|
644 NMTBL *code0;
|
|
|
645 int target = 0;
|
|
|
646 int source = 0;
|
|
|
647 int processing = 0;
|
|
|
648 int use = 0;
|
|
|
649
|
|
|
650 /* まず、サイズを計算しながら、決まった形に落す。 */
|
|
|
651
|
|
|
652 arg_size = 0; regs = 0; max_regs = MAX_REGISTER_VAR-1;
|
|
|
653 for (e3 = reverse0(caddr(e1)); e3; e3 = cadr(e3)) {
|
|
|
654 e2 = car(e3); sz = size(ty=caddr(e3));
|
|
|
655 if (regs <= max_regs&&scalar(ty)) {
|
|
|
656 target=list4(list2(REGISTER,register_var(regs++)), target,ty,e2);
|
|
|
657 } else {
|
|
|
658 target=list4(list2(LVAR,0), target,ty,e2);
|
|
|
659 arg_size += sz;
|
|
|
660 }
|
|
|
661 #if DEBUG_PARALLEL_ASSIGN
|
|
|
662 printf("# target %d ty %d+%d sz %d\n",car(car(target)),ty,cadr(car(target)),sz);
|
|
|
663 #endif
|
|
|
664 }
|
|
|
665
|
|
|
666 /* disp を飛び先似合わせて修正 */
|
|
|
667 if (fnptr->sc==CODE) {
|
|
|
668 if (-arg_size<disp) disp = -arg_size;
|
|
|
669 } else {
|
|
|
670 if (disp_offset-arg_size<disp) disp = disp_offset-arg_size;
|
|
|
671 }
|
|
|
672
|
|
|
673 /* 複雑な式を前もって計算しておく */
|
|
|
674 /* 必要なら局所変数を用いる。 */
|
|
|
675 /* 局所変数へのオフセットを覚えておく */
|
|
|
676
|
|
|
677 for (e2 = target; e2; e2 = cadr(e2)) {
|
|
|
678 t0=car(e2); s0=cadddr(e2);
|
|
|
679 sz=size(ty=caddr(e2));
|
|
|
680 if(car(t0)==LVAR) {
|
|
|
681 /* ここで、書込先アドレスを決める */
|
|
|
682 cadr(t0)=-arg_size;
|
|
|
683 arg_size-=sz;
|
|
|
684 }
|
|
|
685 if (!is_simple(car(s0))) {
|
|
|
686 disp-=sz;
|
|
|
687 g_expr(assign_expr0((e4=list2(LVAR,disp)),s0,ty,ty));
|
|
|
688 cadddr(e2)=e4;
|
|
|
689 s0=e4;
|
|
|
690 } else if (is_same_type(t0,s0)) {
|
|
|
691 if(cadr(t0)==cadr(s0)) {
|
|
|
692 #if DEBUG_PARALLEL_ASSIGN
|
|
|
693 printf("# remove same memory %d ty %d+%d sz %d\n",car(t0),ty,cadr(t0),sz);
|
|
|
694 #endif
|
|
|
695 /* we should check size also (but currently useless */
|
|
|
696 remove0(&target,t0);
|
|
|
697 /* still we have source to avoid overwrite */
|
|
|
698 }
|
|
|
699 }
|
|
|
700 if(is_memory(s0)) {
|
|
|
701 source=list3(s0,source,sz);
|
|
|
702 #if DEBUG_PARALLEL_ASSIGN
|
|
|
703 printf("# source %d ty %d+%d sz %d\n",car(car(source)),ty,cadr(car(source)),sz);
|
|
|
704 #endif
|
|
|
705 }
|
|
|
706 }
|
|
|
707
|
|
|
708 /* compute jump address */
|
|
|
709 e2 = cadr(e1);
|
|
|
710 if (car(e2) == FNAME) {
|
|
|
711 code0=(NMTBL *)cadr(e2);
|
|
|
712 if (code0->sc!=CODE) {
|
|
|
713 error(TYERR); return;
|
|
|
714 }
|
|
|
715 } else { /* indirect */
|
|
|
716 g_expr(e2);
|
|
|
717 emit_push();
|
|
|
718 }
|
|
|
719 if (env) {
|
|
|
720 g_expr(env);
|
|
|
721 emit_push();
|
|
|
722 }
|
|
|
723
|
|
|
724 /* 並列代入を実行 */
|
|
|
725
|
|
|
726 parallel_assign(&target,&source,&processing,&use);
|
|
|
727 while (use) {
|
|
|
728 free_register(caddr(use)); use=cadr(use);
|
|
|
729 }
|
|
|
730 if(target) error(-1);
|
|
|
731
|
|
|
732 if (env) {
|
|
|
733 /* change the frame pointer */
|
|
|
734 e3 = emit_pop(0);
|
|
|
735 code_frame_pointer(e3);
|
|
|
736 emit_pop_free(e3);
|
|
|
737 } else if (fnptr->sc==FUNCTION) {
|
|
|
738 code_fix_frame_pointer(disp_offset);
|
|
|
739 }
|
|
|
740
|
|
|
741 if (car(e2) == FNAME) {
|
|
|
742 code_jmp(code0->nm);
|
|
|
743 } else {
|
|
|
744 e2 = emit_pop(0);
|
|
|
745 code_indirect_jmp(e2);
|
|
|
746 emit_pop_free(e2);
|
|
|
747 }
|
|
|
748 }
|
|
|
749
|
|
|
750 void
|
|
|
751 machinop(int e1)
|
|
|
752 {
|
|
|
753 int e2,e3,op;
|
|
|
754
|
|
|
755 e2 = cadr(e1);
|
|
|
756 op = car(e1);
|
|
|
757 e3 = caddr(e1);
|
|
|
758 g_expr(e3);
|
|
|
759 emit_push();
|
|
|
760 g_expr(e2);
|
|
|
761 tosop(car(e1),(e2=pop_register()));
|
|
|
762 emit_pop_free(e2);
|
|
|
763 regv[creg]=1;
|
|
|
764 return;
|
|
|
765 }
|
|
|
766
|
|
|
767
|
|
|
768 void
|
|
|
769 sassign(int e1)
|
|
|
770 {
|
|
|
771 int e2,e3,e4,sz,xreg,det;
|
|
|
772
|
|
|
773 /* structure assignment */
|
|
|
774 e2 = cadr(e1); /* pointer variable to the struct */
|
|
|
775 e3 = cadr(e2); /* offset of the variable (distination) */
|
|
|
776 e4 = caddr(e1); /* right value (source) */
|
|
|
777 sz = cadddr(e1); /* size of struct or union */
|
|
|
778 g_expr(e4);
|
|
|
779 emit_push();
|
|
|
780 g_expr(e2);
|
|
|
781 xreg = emit_pop(0);
|
|
|
782 /* 一般的にはコピーのオーバラップの状況は実行時にしかわからない */
|
|
|
783 /* しかし、わかる場合もある */
|
|
|
784 if (car(e4)==RSTRUCT) e4=cadr(e4);
|
|
|
785 if (is_same_type(e2,e4)) {
|
|
|
786 if(cadr(e2)<cadr(e4)) sz=-sz;
|
|
|
787 det=1;
|
|
|
788 } else {
|
|
|
789 det = 0;
|
|
|
790 }
|
|
|
791 emit_copy(xreg,creg,sz,0,1,det);
|
|
|
792 emit_pop_free(xreg);
|
|
|
793 return;
|
|
|
794 }
|
|
|
795
|
|
|
796 void
|
|
|
797 assign(int e1)
|
|
|
798 {
|
|
|
799 int e2,e3,e4,byte;
|
|
|
800
|
|
|
801 byte=(car(e1) == CASS);
|
|
|
802 /* e2=e4 */
|
|
|
803 e2 = cadr(e1);
|
|
|
804 e3 = cadr(e2);
|
|
|
805 e4 = caddr(e1);
|
|
|
806 switch(car(e2)) {
|
|
|
807 case GVAR: /* i=3 */
|
|
|
808 g_expr(e4);
|
|
|
809 code_assign_gvar(e2,byte);
|
|
|
810 return;
|
|
|
811 case LVAR:
|
|
|
812 g_expr(e4);
|
|
|
813 code_assign_lvar(lvar(cadr(e2)),byte);
|
|
|
814 return;
|
|
|
815 case REGISTER:
|
|
|
816 g_expr(e4);
|
|
|
817 if (creg!=cadr(e2))
|
|
|
818 code_assign_register(cadr(e2),byte);
|
|
|
819 return;
|
|
|
820 }
|
|
|
821 g_expr(e2);
|
|
|
822 emit_push();
|
|
|
823 use_data_reg(creg,0);
|
|
|
824 g_expr(e4);
|
|
|
825 if (byte) use_data_reg(creg,1);
|
|
|
826 e2 = emit_pop(0);
|
|
|
827 code_assign(e2,byte);
|
|
|
828 emit_pop_free(e2);
|
|
|
829 regv[creg]=1;
|
|
|
830 return;
|
|
|
831 }
|
|
|
832
|
|
|
833 void
|
|
|
834 assop(int e1)
|
|
|
835 {
|
|
|
836 int e2,e3,byte,op;
|
|
|
837
|
|
|
838 /* e2 op= e3 */
|
|
|
839 byte = (car(e1) == CASSOP);
|
|
|
840 e2 = cadr(e1);
|
|
|
841 if (car(e2)==INDIRECT) e2=cadr(e2);
|
|
|
842 e3 = caddr(e1);
|
|
|
843 op = cadddr(e1);
|
|
|
844
|
|
|
845 g_expr(e3);
|
|
|
846 if (car(e2)==REGISTER) {
|
|
|
847 code_register_assop(cadr(e2),op,byte);
|
|
|
848 regv[creg]=1;
|
|
|
849 return;
|
|
|
850 }
|
|
|
851 emit_push();
|
|
|
852 g_expr(e2);
|
|
|
853 code_assop(op,byte);
|
|
|
854 regv[creg]=1;
|
|
|
855 return;
|
|
|
856 }
|
|
|
857
|
|
|
858
|
|
|
859 int
|
|
|
860 fwdlabel(void)
|
|
|
861 {
|
|
|
862 return labelno++;
|
|
|
863 }
|
|
|
864
|
|
|
865 void
|
|
|
866 fwddef(int l)
|
|
|
867 {
|
|
|
868 control=1;
|
|
66
|
869 if (!chk)
|
|
|
870 printf("_%d:\n",l);
|
|
61
|
871 }
|
|
|
872
|
|
|
873 int
|
|
|
874 backdef(void)
|
|
|
875 {
|
|
|
876 control=1;
|
|
66
|
877 if (!chk)
|
|
|
878 printf("_%d:\n",labelno);
|
|
61
|
879 return labelno++;
|
|
|
880 }
|
|
|
881
|
|
|
882 void
|
|
|
883 def_label(int cslabel, int dlabel)
|
|
|
884 {
|
|
|
885 int fl;
|
|
|
886
|
|
|
887 fl = 0;
|
|
|
888 if (control) {
|
|
|
889 jmp(fl=fwdlabel());
|
|
|
890 }
|
|
|
891 fwddef(cslabel);
|
|
|
892 if (dlabel)
|
|
|
893 jmp(dlabel);
|
|
|
894 if (fl) {
|
|
|
895 fwddef(fl);
|
|
|
896 }
|
|
|
897 }
|
|
|
898
|
|
|
899 void
|
|
|
900 gen_source(char *s)
|
|
|
901 {
|
|
|
902 printf("%s",s);
|
|
|
903 }
|
|
|
904
|
|
|
905 void
|
|
|
906 ret(void)
|
|
|
907 {
|
|
|
908 code_set_fixed_creg(1);
|
|
|
909 jmp(retlabel);
|
|
|
910 }
|
|
|
911
|
|
66
|
912 void
|
|
|
913 opening(char *filename)
|
|
|
914 {
|
|
|
915 emit_init();
|
|
|
916 if (!chk)
|
|
|
917 code_opening(filename);
|
|
|
918 }
|
|
|
919
|
|
|
920 void
|
|
|
921 closing()
|
|
|
922 {
|
|
|
923 if (!chk)
|
|
|
924 code_closing();
|
|
|
925 }
|
|
|
926
|
|
61
|
927 /* end */
|
