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annotate third_party/luajit/src/lj_dispatch.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 ** Instruction dispatch 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_DISPATCH_H
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7 #define _LJ_DISPATCH_H
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8
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9 #include "lj_obj.h"
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10 #include "lj_bc.h"
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11 #if LJ_HASJIT
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12 #include "lj_jit.h"
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13 #endif
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14
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15 #if LJ_TARGET_MIPS
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16 /* Need our own global offset table for the dreaded MIPS calling conventions. */
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17
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18 #ifndef _LJ_VM_H
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19 LJ_ASMF int32_t LJ_FASTCALL lj_vm_modi(int32_t a, int32_t b);
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20 #endif
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21
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22 #if LJ_SOFTFP
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23 #ifndef _LJ_IRCALL_H
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24 extern double __adddf3(double a, double b);
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25 extern double __subdf3(double a, double b);
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26 extern double __muldf3(double a, double b);
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27 extern double __divdf3(double a, double b);
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28 #endif
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29 #define SFGOTDEF(_) _(sqrt) _(__adddf3) _(__subdf3) _(__muldf3) _(__divdf3)
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30 #else
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31 #define SFGOTDEF(_)
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32 #endif
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33 #if LJ_HASJIT
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34 #define JITGOTDEF(_) _(lj_err_trace) _(lj_trace_exit) _(lj_trace_hot)
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35 #else
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36 #define JITGOTDEF(_)
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37 #endif
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38 #if LJ_HASFFI
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39 #define FFIGOTDEF(_) \
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40 _(lj_meta_equal_cd) _(lj_ccallback_enter) _(lj_ccallback_leave)
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41 #else
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42 #define FFIGOTDEF(_)
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43 #endif
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44 #define GOTDEF(_) \
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45 _(floor) _(ceil) _(trunc) _(log) _(log10) _(exp) _(sin) _(cos) _(tan) \
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46 _(asin) _(acos) _(atan) _(sinh) _(cosh) _(tanh) _(frexp) _(modf) _(atan2) \
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47 _(pow) _(fmod) _(ldexp) _(lj_vm_modi) \
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48 _(lj_dispatch_call) _(lj_dispatch_ins) _(lj_dispatch_stitch) \
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49 _(lj_dispatch_profile) _(lj_err_throw) \
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50 _(lj_ffh_coroutine_wrap_err) _(lj_func_closeuv) _(lj_func_newL_gc) \
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51 _(lj_gc_barrieruv) _(lj_gc_step) _(lj_gc_step_fixtop) _(lj_meta_arith) \
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52 _(lj_meta_call) _(lj_meta_cat) _(lj_meta_comp) _(lj_meta_equal) \
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53 _(lj_meta_for) _(lj_meta_istype) _(lj_meta_len) _(lj_meta_tget) \
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54 _(lj_meta_tset) _(lj_state_growstack) _(lj_strfmt_number) \
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55 _(lj_str_new) _(lj_tab_dup) _(lj_tab_get) _(lj_tab_getinth) _(lj_tab_len) \
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56 _(lj_tab_new) _(lj_tab_newkey) _(lj_tab_next) _(lj_tab_reasize) \
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57 _(lj_tab_setinth) _(lj_buf_putstr_reverse) _(lj_buf_putstr_lower) \
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58 _(lj_buf_putstr_upper) _(lj_buf_tostr) \
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59 JITGOTDEF(_) FFIGOTDEF(_) SFGOTDEF(_)
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60
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61 enum {
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62 #define GOTENUM(name) LJ_GOT_##name,
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63 GOTDEF(GOTENUM)
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64 #undef GOTENUM
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65 LJ_GOT__MAX
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66 };
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67 #endif
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68
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69 /* Type of hot counter. Must match the code in the assembler VM. */
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70 /* 16 bits are sufficient. Only 0.0015% overhead with maximum slot penalty. */
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71 typedef uint16_t HotCount;
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72
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73 /* Number of hot counter hash table entries (must be a power of two). */
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74 #define HOTCOUNT_SIZE 64
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75 #define HOTCOUNT_PCMASK ((HOTCOUNT_SIZE-1)*sizeof(HotCount))
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76
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77 /* Hotcount decrements. */
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78 #define HOTCOUNT_LOOP 2
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79 #define HOTCOUNT_CALL 1
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80
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81 /* This solves a circular dependency problem -- bump as needed. Sigh. */
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82 #define GG_NUM_ASMFF 57
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83
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84 #define GG_LEN_DDISP (BC__MAX + GG_NUM_ASMFF)
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85 #define GG_LEN_SDISP BC_FUNCF
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86 #define GG_LEN_DISP (GG_LEN_DDISP + GG_LEN_SDISP)
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87
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88 /* Global state, main thread and extra fields are allocated together. */
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89 typedef struct GG_State {
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90 lua_State L; /* Main thread. */
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91 global_State g; /* Global state. */
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92 #if LJ_TARGET_ARM && !LJ_TARGET_NX
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93 /* Make g reachable via K12 encoded DISPATCH-relative addressing. */
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94 uint8_t align1[(16-sizeof(global_State))&15];
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95 #endif
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96 #if LJ_TARGET_MIPS
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97 ASMFunction got[LJ_GOT__MAX]; /* Global offset table. */
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98 #endif
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99 #if LJ_HASJIT
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100 jit_State J; /* JIT state. */
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101 HotCount hotcount[HOTCOUNT_SIZE]; /* Hot counters. */
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102 #if LJ_TARGET_ARM && !LJ_TARGET_NX
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103 /* Ditto for J. */
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104 uint8_t align2[(16-sizeof(jit_State)-sizeof(HotCount)*HOTCOUNT_SIZE)&15];
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105 #endif
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106 #endif
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107 ASMFunction dispatch[GG_LEN_DISP]; /* Instruction dispatch tables. */
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108 BCIns bcff[GG_NUM_ASMFF]; /* Bytecode for ASM fast functions. */
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109 } GG_State;
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110
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111 #define GG_OFS(field) ((int)offsetof(GG_State, field))
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112 #define G2GG(gl) ((GG_State *)((char *)(gl) - GG_OFS(g)))
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113 #define J2GG(j) ((GG_State *)((char *)(j) - GG_OFS(J)))
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114 #define L2GG(L) (G2GG(G(L)))
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115 #define J2G(J) (&J2GG(J)->g)
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116 #define G2J(gl) (&G2GG(gl)->J)
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117 #define L2J(L) (&L2GG(L)->J)
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118 #define GG_G2J (GG_OFS(J) - GG_OFS(g))
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119 #define GG_G2DISP (GG_OFS(dispatch) - GG_OFS(g))
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120 #define GG_DISP2G (GG_OFS(g) - GG_OFS(dispatch))
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121 #define GG_DISP2J (GG_OFS(J) - GG_OFS(dispatch))
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122 #define GG_DISP2HOT (GG_OFS(hotcount) - GG_OFS(dispatch))
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123 #define GG_DISP2STATIC (GG_LEN_DDISP*(int)sizeof(ASMFunction))
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124
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125 #define hotcount_get(gg, pc) \
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126 (gg)->hotcount[(u32ptr(pc)>>2) & (HOTCOUNT_SIZE-1)]
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127 #define hotcount_set(gg, pc, val) \
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128 (hotcount_get((gg), (pc)) = (HotCount)(val))
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129
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130 /* Dispatch table management. */
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131 LJ_FUNC void lj_dispatch_init(GG_State *GG);
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132 #if LJ_HASJIT
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133 LJ_FUNC void lj_dispatch_init_hotcount(global_State *g);
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134 #endif
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135 LJ_FUNC void lj_dispatch_update(global_State *g);
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136
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137 /* Instruction dispatch callback for hooks or when recording. */
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138 LJ_FUNCA void LJ_FASTCALL lj_dispatch_ins(lua_State *L, const BCIns *pc);
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139 LJ_FUNCA ASMFunction LJ_FASTCALL lj_dispatch_call(lua_State *L, const BCIns*pc);
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140 #if LJ_HASJIT
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141 LJ_FUNCA void LJ_FASTCALL lj_dispatch_stitch(jit_State *J, const BCIns *pc);
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142 #endif
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143 #if LJ_HASPROFILE
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144 LJ_FUNCA void LJ_FASTCALL lj_dispatch_profile(lua_State *L, const BCIns *pc);
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145 #endif
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146
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147 #if LJ_HASFFI && !defined(_BUILDVM_H)
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148 /* Save/restore errno and GetLastError() around hooks, exits and recording. */
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149 #include <errno.h>
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150 #if LJ_TARGET_WINDOWS
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151 #define WIN32_LEAN_AND_MEAN
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152 #include <windows.h>
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153 #define ERRNO_SAVE int olderr = errno; DWORD oldwerr = GetLastError();
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154 #define ERRNO_RESTORE errno = olderr; SetLastError(oldwerr);
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155 #else
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156 #define ERRNO_SAVE int olderr = errno;
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157 #define ERRNO_RESTORE errno = olderr;
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158 #endif
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159 #else
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160 #define ERRNO_SAVE
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161 #define ERRNO_RESTORE
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162 #endif
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163
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164 #endif