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annotate third_party/luajit/src/lj_ccall.h @ 210:0abed117e623

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Updated manifest color.
author MrJuneJune <me@mrjunejune.com>
date Sun, 15 Feb 2026 15:47:38 -0800
parents 94705b5986b3
children
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178
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1 /*
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2 ** FFI C call handling.
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3 ** Copyright (C) 2005-2023 Mike Pall. See Copyright Notice in luajit.h
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4 */
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5
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6 #ifndef _LJ_CCALL_H
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7 #define _LJ_CCALL_H
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8
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9 #include "lj_obj.h"
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10 #include "lj_ctype.h"
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11
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12 #if LJ_HASFFI
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13
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14 /* -- C calling conventions ----------------------------------------------- */
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15
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16 #if LJ_TARGET_X86ORX64
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17
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18 #if LJ_TARGET_X86
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19 #define CCALL_NARG_GPR 2 /* For fastcall arguments. */
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20 #define CCALL_NARG_FPR 0
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21 #define CCALL_NRET_GPR 2
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22 #define CCALL_NRET_FPR 1 /* For FP results on x87 stack. */
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23 #define CCALL_ALIGN_STACKARG 0 /* Don't align argument on stack. */
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24 #elif LJ_ABI_WIN
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25 #define CCALL_NARG_GPR 4
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26 #define CCALL_NARG_FPR 4
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27 #define CCALL_NRET_GPR 1
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28 #define CCALL_NRET_FPR 1
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29 #define CCALL_SPS_EXTRA 4
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30 #else
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31 #define CCALL_NARG_GPR 6
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32 #define CCALL_NARG_FPR 8
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33 #define CCALL_NRET_GPR 2
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34 #define CCALL_NRET_FPR 2
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35 #define CCALL_VECTOR_REG 1 /* Pass vectors in registers. */
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36 #endif
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37
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38 #define CCALL_SPS_FREE 1
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39 #define CCALL_ALIGN_CALLSTATE 16
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40
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41 typedef LJ_ALIGN(16) union FPRArg {
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42 double d[2];
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43 float f[4];
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44 uint8_t b[16];
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45 uint16_t s[8];
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46 int i[4];
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47 int64_t l[2];
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48 } FPRArg;
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49
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50 typedef intptr_t GPRArg;
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51
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52 #elif LJ_TARGET_ARM
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53
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54 #define CCALL_NARG_GPR 4
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55 #define CCALL_NRET_GPR 2 /* For softfp double. */
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56 #if LJ_ABI_SOFTFP
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57 #define CCALL_NARG_FPR 0
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58 #define CCALL_NRET_FPR 0
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59 #else
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60 #define CCALL_NARG_FPR 8
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61 #define CCALL_NRET_FPR 4
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62 #endif
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63 #define CCALL_SPS_FREE 0
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64
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65 typedef intptr_t GPRArg;
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66 typedef union FPRArg {
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67 double d;
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68 float f[2];
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69 } FPRArg;
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70
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71 #elif LJ_TARGET_ARM64
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72
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73 #define CCALL_NARG_GPR 8
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74 #define CCALL_NRET_GPR 2
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75 #define CCALL_NARG_FPR 8
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76 #define CCALL_NRET_FPR 4
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77 #define CCALL_SPS_FREE 0
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78
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79 typedef intptr_t GPRArg;
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80 typedef union FPRArg {
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81 double d;
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82 struct { LJ_ENDIAN_LOHI(float f; , float g;) };
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83 struct { LJ_ENDIAN_LOHI(uint32_t lo; , uint32_t hi;) };
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84 } FPRArg;
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85
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86 #elif LJ_TARGET_PPC
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87
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88 #define CCALL_NARG_GPR 8
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89 #define CCALL_NARG_FPR (LJ_ABI_SOFTFP ? 0 : 8)
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90 #define CCALL_NRET_GPR 4 /* For complex double. */
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91 #define CCALL_NRET_FPR (LJ_ABI_SOFTFP ? 0 : 1)
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92 #define CCALL_SPS_EXTRA 4
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93 #define CCALL_SPS_FREE 0
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94
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95 typedef intptr_t GPRArg;
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96 typedef double FPRArg;
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97
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98 #elif LJ_TARGET_MIPS32
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99
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100 #define CCALL_NARG_GPR 4
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101 #define CCALL_NARG_FPR (LJ_ABI_SOFTFP ? 0 : 2)
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102 #define CCALL_NRET_GPR (LJ_ABI_SOFTFP ? 4 : 2)
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103 #define CCALL_NRET_FPR (LJ_ABI_SOFTFP ? 0 : 2)
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104 #define CCALL_SPS_EXTRA 7
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105 #define CCALL_SPS_FREE 1
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106
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107 typedef intptr_t GPRArg;
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108 typedef union FPRArg {
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109 double d;
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110 struct { LJ_ENDIAN_LOHI(float f; , float g;) };
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111 } FPRArg;
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112
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113 #elif LJ_TARGET_MIPS64
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114
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115 /* FP args are positional and overlay the GPR array. */
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116 #define CCALL_NARG_GPR 8
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117 #define CCALL_NARG_FPR 0
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118 #define CCALL_NRET_GPR 2
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119 #define CCALL_NRET_FPR (LJ_ABI_SOFTFP ? 0 : 2)
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120 #define CCALL_SPS_EXTRA 3
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121 #define CCALL_SPS_FREE 1
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122
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123 typedef intptr_t GPRArg;
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124 typedef union FPRArg {
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125 double d;
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126 struct { LJ_ENDIAN_LOHI(float f; , float g;) };
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127 } FPRArg;
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128
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129 #else
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130 #error "Missing calling convention definitions for this architecture"
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131 #endif
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132
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133 #ifndef CCALL_SPS_EXTRA
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134 #define CCALL_SPS_EXTRA 0
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135 #endif
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136 #ifndef CCALL_VECTOR_REG
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137 #define CCALL_VECTOR_REG 0
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138 #endif
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139 #ifndef CCALL_ALIGN_STACKARG
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140 #define CCALL_ALIGN_STACKARG 1
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141 #endif
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142 #ifndef CCALL_ALIGN_CALLSTATE
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143 #define CCALL_ALIGN_CALLSTATE 8
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144 #endif
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145
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146 #define CCALL_NUM_GPR \
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147 (CCALL_NARG_GPR > CCALL_NRET_GPR ? CCALL_NARG_GPR : CCALL_NRET_GPR)
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148 #define CCALL_NUM_FPR \
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149 (CCALL_NARG_FPR > CCALL_NRET_FPR ? CCALL_NARG_FPR : CCALL_NRET_FPR)
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150
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151 /* Check against constants in lj_ctype.h. */
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152 LJ_STATIC_ASSERT(CCALL_NUM_GPR <= CCALL_MAX_GPR);
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153 LJ_STATIC_ASSERT(CCALL_NUM_FPR <= CCALL_MAX_FPR);
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154
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155 #define CCALL_MAXSTACK 32
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156
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157 /* -- C call state -------------------------------------------------------- */
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158
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159 typedef LJ_ALIGN(CCALL_ALIGN_CALLSTATE) struct CCallState {
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160 void (*func)(void); /* Pointer to called function. */
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161 uint32_t spadj; /* Stack pointer adjustment. */
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162 uint8_t nsp; /* Number of stack slots. */
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163 uint8_t retref; /* Return value by reference. */
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164 #if LJ_TARGET_X64
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165 uint8_t ngpr; /* Number of arguments in GPRs. */
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166 uint8_t nfpr; /* Number of arguments in FPRs. */
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167 #elif LJ_TARGET_X86
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168 uint8_t resx87; /* Result on x87 stack: 1:float, 2:double. */
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169 #elif LJ_TARGET_ARM64
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170 void *retp; /* Aggregate return pointer in x8. */
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171 #elif LJ_TARGET_PPC
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172 uint8_t nfpr; /* Number of arguments in FPRs. */
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173 #endif
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174 #if LJ_32
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175 int32_t align1;
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176 #endif
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177 #if CCALL_NUM_FPR
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178 FPRArg fpr[CCALL_NUM_FPR]; /* Arguments/results in FPRs. */
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179 #endif
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180 GPRArg gpr[CCALL_NUM_GPR]; /* Arguments/results in GPRs. */
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181 GPRArg stack[CCALL_MAXSTACK]; /* Stack slots. */
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182 } CCallState;
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183
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184 /* -- C call handling ----------------------------------------------------- */
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185
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186 /* Really belongs to lj_vm.h. */
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187 LJ_ASMF void LJ_FASTCALL lj_vm_ffi_call(CCallState *cc);
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188
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189 LJ_FUNC CTypeID lj_ccall_ctid_vararg(CTState *cts, cTValue *o);
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190 LJ_FUNC int lj_ccall_func(lua_State *L, GCcdata *cd);
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191
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192 #endif
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193
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194 #endif