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1 /*****************************************************************************
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2
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3 NAME
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4 ick_ec.h -- external call support between C and C-INTERCAL
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5
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6 LICENSE TERMS
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7 Copyright (C) 2008 Alex Smith
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8
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9 This program is free software; you can redistribute it and/or modify
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10 it under the terms of the GNU General Public License as published by
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11 the Free Software Foundation; either version 2 of the License, or
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12 (at your option) any later version.
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13
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14 This program is distributed in the hope that it will be useful,
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15 but WITHOUT ANY WARRANTY; without even the implied warranty of
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16 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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17 GNU General Public License for more details.
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18
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19 You should have received a copy of the GNU General Public License
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20 along with this program; if not, write to the Free Software
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21 Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
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22
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23 ***************************************************************************/
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24
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25 /* The external calls to C work via ICK_EC_FUNCs; whenever a suckpoint is
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26 encountered, all ICK_EC_FUNCs are run with ick_global_checkmode set to 1,
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27 and when a NEXT is called but finds no target in the INTERCAL program, all
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28 ICK_EC_FUNCs are run with ick_global_checkmode set to 2. COME FROMs and
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29 NEXT FROMs don't steal control immediately (they know where to steal
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30 control from using ick_global_linelabel), but instead set ick_global_goto
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31 to a 'high' line label (one of the internal ones above 65536 which are
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32 allocated for this sort of purpose, and inside the preprocessor) or error
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33 if it's set nonzero already. After verifying that exactly one COME or NEXT
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34 FROM is involved, the INTERCAL program will NEXT to the high line label
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35 (whether it leaves a NEXT stack entry will depend on whether COME FROM or
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36 NEXT FROM was used, which is communicated by a NEXT FROM setting the
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37 checkmode to 3, which is identical to 1 in all other respects).
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38
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39 To prevent this process running the program out of stack space (which would
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40 happen with a naive implementation if there were many COME FROMs from
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41 inside the C program back to inside the C program), all transitions but
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42 NEXTs are done indirectly, by jumping back inside a relevant invocation of
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43 ick_dogoto and changing its targets. (So effectively, to GOTO a particular
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44 destination, you go back in time to the last time you NEXTed - or to
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45 implement a FORGET, the last-but-n-time you NEXTed - and redo it with a
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46 different target.)
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47 */
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48
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49 #if ICK_HAVE_STDINT_H+1 == 2
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50 #include <stdint.h>
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51 #else
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52 /* Ensure that uint32_t, etc, aren't implemented as compatibility macros
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53 so that we can implement them as typedefs. */
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54 #undef uint32_t
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55 #undef uint16_t
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56 typedef unsigned int uint32_t;
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57 typedef unsigned short uint16_t;
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58 #endif
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59
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60 #ifndef ICK_ABCESS_H_INCLUDED
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61 typedef unsigned short ick_type16;
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62 typedef unsigned int ick_type32;
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63 #endif
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64
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65 #define ICK_EC_FUNC_START(id) \
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66 ICK_EC_PP_0(id) \
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67 void id(void) \
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68 { \
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69 void* ick_local_createdata = \
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70 ick_global_createdata; \
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71 int ick_local_checkmode = ick_global_checkmode; \
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72 if(ick_global_checkmode==6) \
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73 { \
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74 goto ick_l6_ICK_EC_PP_6; \
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75 } \
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76 if(ick_global_checkmode==2) \
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77 { \
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78 goto ick_l2_ICK_EC_PP_2; \
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79 } \
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80 else if(ick_global_checkmode==1 || \
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81 ick_global_checkmode==3) \
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82 { \
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83 goto ick_l1_ICK_EC_PP_1; \
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84 } \
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85 ick_local_checkmode=ick_global_checkmode=0;
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86
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87 #define ick_linelabel(expr) ick_labeledblock(expr,0)
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88
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89 #define ick_labeledblock(expr,block) \
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90 do { \
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91 if(0) \
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92 { \
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93 ick_l2_ICK_EC_PP_2: ; \
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94 if(ick_global_linelabel != (expr) || (expr) > 65535) \
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95 goto ick_l2_ICK_EC_PP_2; \
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96 ick_global_checkmode = 0; \
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97 } \
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98 block ; \
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99 ick_checksuckpoint(expr); \
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100 } \
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101 while(0)
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102
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103 #define ick_linelabelnosp(expr) \
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104 do { \
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105 if(0) \
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106 { \
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107 ick_l2_ICK_EC_PP_2: ; \
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108 if(ick_global_linelabel != (expr) || (expr) > 65535) \
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109 goto ick_l2_ICK_EC_PP_2; \
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110 ick_global_checkmode = 0; \
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111 } \
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112 } \
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113 while(0)
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114
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115 #define ick_forget(amount) \
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116 do { \
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117 ick_scheduleforget(amount); \
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118 ick_dogoto(ICK_EC_PP_3,-1,0); \
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119 ick_lose(ICK_IE778, -1, (char*) NULL); \
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120 return; \
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121 ick_l2_ICK_EC_PP_2: ; \
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122 if(ick_global_linelabel != ICK_EC_PP_3) \
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123 goto ick_l2_ICK_EC_PP_2; \
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124 ick_global_checkmode = 0; \
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125 } while(0)
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126
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127
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128 #define ick_startup(block) \
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129 if(0) \
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130 { \
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131 ick_l6_ICK_EC_PP_6: \
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132 ick_global_checkmode=0; \
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133 block ; \
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134 ick_global_checkmode=ick_local_checkmode; \
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135 goto ick_l6_ICK_EC_PP_6; \
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136 }
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137
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138 #define ick_comefrom(expr) \
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139 if(0) \
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140 { \
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141 ick_l1_ICK_EC_PP_1: ; \
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142 if(ick_global_linelabel == (expr) && (expr) <= 65535) \
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143 { \
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144 if(ick_global_goto) ick_lose(ICK_IE555, -1, (char*)0); \
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145 ick_global_goto = ICK_EC_PP_3; \
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146 } \
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147 goto ick_l1_ICK_EC_PP_1; \
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148 ick_l2_ICK_EC_PP_2: ; \
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149 if(ick_global_linelabel != ICK_EC_PP_3) \
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150 goto ick_l2_ICK_EC_PP_2; \
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151 ick_global_checkmode = 0; \
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152 }
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153
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154 #define ick_comefromif(expr,condition) \
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155 ick_docomefromif(expr,-1,condition)
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156
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157 #define ick_docomefromif(expr,lbl,condition) \
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158 if(0) \
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159 { \
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160 ick_l1_ICK_EC_PP_1: ; \
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161 if(ick_global_linelabel == (expr) && (expr) <= 65535) \
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162 if(condition) \
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163 { \
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164 if(ick_global_goto) ick_lose(ICK_IE555, lbl, (char*)0); \
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165 ick_global_goto = ICK_EC_PP_3; \
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166 } \
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167 goto ick_l1_ICK_EC_PP_1; \
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168 ick_l2_ICK_EC_PP_2: ; \
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169 if(ick_global_linelabel != ICK_EC_PP_3) \
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170 goto ick_l2_ICK_EC_PP_2; \
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171 ick_global_checkmode = 0; \
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172 }
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173
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174 #define ick_nextfrom(expr) \
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175 if(0) \
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176 { \
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177 ick_l1_ICK_EC_PP_1: ; \
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178 if(ick_global_linelabel == (expr) && (expr) <= 65535) \
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179 { \
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180 if(ick_global_goto) ick_lose(ICK_IE555, -1, (char*)0); \
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181 ick_global_goto = ICK_EC_PP_3; \
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182 ick_global_checkmode = 3; \
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183 } \
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184 goto ick_l1_ICK_EC_PP_1; \
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185 ick_l2_ICK_EC_PP_2: ; \
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186 if(ick_global_linelabel != ICK_EC_PP_3) \
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187 goto ick_l2_ICK_EC_PP_2; \
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188 ick_global_checkmode = 0; \
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189 }
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190
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191 #define ick_nextfromif(expr,condition) \
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192 ick_donextfromif(expr,-1,condition)
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193
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194 #define ick_donextfromif(expr,lbl,condition) \
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195 if(0) \
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196 { \
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197 ick_l1_ICK_EC_PP_1: ; \
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198 if(ick_global_linelabel == (expr) && (expr) <= 65535) \
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199 if(condition) \
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200 { \
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201 if(ick_global_goto) ick_lose(ICK_IE555, lbl, (char*)0); \
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202 ick_global_goto = ICK_EC_PP_3; \
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203 ick_global_checkmode = 3; \
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204 } \
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205 goto ick_l1_ICK_EC_PP_1; \
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206 ick_l2_ICK_EC_PP_2: ; \
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207 if(ick_global_linelabel != ICK_EC_PP_3) \
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208 goto ick_l2_ICK_EC_PP_2; \
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209 ick_global_checkmode = 0; \
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210 }
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211
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212
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213 #define ICK_EC_FUNC_END \
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214 if(ick_local_checkmode) ick_resume(1); \
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215 ick_l1_ICK_EC_PP_1: ; \
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216 ick_l6_ICK_EC_PP_6: ; \
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217 ick_l2_ICK_EC_PP_2: return; \
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218 }
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219
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220 #define ick_next(label) do{ \
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221 if((label)<=65535) \
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222 ick_dogoto((label),-1,1); \
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223 } while(0)
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224
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225 #define ick_goto(label) do{ \
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226 if((label)<=65535) \
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227 ick_dogoto((label),-1,0); \
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228 } while(0)
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229
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230 #define ick_resume(amount) ick_doresume((amount),-1)
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231
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232 #define ick_return_or_resume() do{ \
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233 if(ick_local_checkmode) ick_doresume(1,-1); \
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234 return; \
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235 } while(0)
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236
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237 /*@maynotreturn@*/ void ick_dogoto(unsigned long, int, int);
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238 void ick_scheduleforget(unsigned short);
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239 /*@noreturn@*/ void ick_doresume(unsigned short, int);
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240 /*@maynotreturn@*/ void ick_checksuckpoint(unsigned long);
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241 void ick_runstartups(void);
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242 /*@maynotreturn@*/ uint32_t ick_dounop(char*, uint32_t, uint32_t, int,
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243 unsigned long, unsigned long, unsigned long,
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244 ick_type32(*)(ick_type32),
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245 ick_type32(*)(ick_type32),
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246 ick_type32(*)(ick_type32),
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247 void(*)(ick_type32, void(*)()),
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248 void(*)(ick_type32, void(*)()),
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249 void(*)(ick_type32, void(*)()),
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250 /*@observer@*/ const char*);
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251
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252 void ick_allecfuncs(void); /* in generated program */
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253
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254 extern int ick_global_checkmode;
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255 extern unsigned long ick_global_linelabel;
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256 extern unsigned long ick_global_goto;
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257 extern void* ick_global_createdata;
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258
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259 /* Variables. */
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260 typedef struct ick_ec_var_tag
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261 {
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262 int ick_ec_vartype;
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263 int ick_ec_extername;
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264 int ick_ec_intername;
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265 } ick_ec_var;
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266
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267 extern ick_ec_var ick_ec_vars[];
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268
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269 #define ICK_EC_VARS_END 5
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270
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271 uint16_t ick_getonespot(unsigned short);
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272 void ick_setonespot(unsigned short, uint16_t);
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273 uint32_t ick_gettwospot(unsigned short);
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274 void ick_settwospot(unsigned short, uint32_t);
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275
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276 void ick_create(const char*, unsigned long);
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277
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278 /* For accessing the arguments to an ick_created command */
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279 int ick_c_i_width(int);
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280 int ick_c_i_isarray(int);
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281 unsigned short ick_c_i_varnumber(int);
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282 uint32_t ick_c_i_value(int);
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283 /* These require -a to work */
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284 uint32_t ick_c_i_getvalue(int);
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285 void ick_c_i_setvalue(int, uint32_t);
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286
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287 #define ick_c_width(a) ick_c_i_width((ick_global_createdata=ick_local_createdata,(a)))
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288 #define ick_c_isarray(a) ick_c_i_isarray((ick_global_createdata=ick_local_createdata,(a)))
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289 #define ick_c_varnumber(a) ick_c_i_varnumber((ick_global_createdata=ick_local_createdata,(a)))
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290 #define ick_c_value(a) ick_c_i_value((ick_global_createdata=ick_local_createdata,(a)))
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291 #define ick_c_getvalue(a) ick_c_i_getvalue((ick_global_createdata=ick_local_createdata,(a)))
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292 #define ick_c_setvalue(a,n) ick_c_i_setvalue((ick_global_createdata=ick_local_createdata,(a)),(n))
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293
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294 /* Fragments of ick_lose.h, that don't impinge on unmangled namespace. */
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295 #define ICK_IE555 "555 FLOW DIAGRAM IS EXCESSIVELY CONNECTED\n\
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296 ON THE WAY TO %d\n"
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297 #define ICK_IE778 "778 UNEXPLAINED COMPILER BUG\n\
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298 ON THE WAY TO %d\n"
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299
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300 extern void /*@noreturn@*/ ick_lose(const char *m, int n, /*@null@*/ const char *s)
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301 #ifdef __GNUC__
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302 __attribute__ ((noreturn))
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303 #endif
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304 ;
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