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annotate third_party/luajit/src/lj_ccall.h @ 279:b3b547563ec7

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Add Google connector service and agent wiki Implement the C/Seobeo Google Drive and Gmail connector with encrypted OAuth storage, Zenbu authentication, browser testing, AI tool discovery, chunked HTTP decoding, and Bazel coverage. Consolidate repository guidance into progressive wiki documentation and enforce arena-first allocation for new first-party C code. Co-authored-by: Copilot <[email protected]> Copilot-Session: 84c338fd-0939-4bb3-b7f3-1062eb213e5d
author MrJuneJune <me@mrjunejune.com>
date Mon, 17 Aug 2026 22:22:36 -0700
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