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Replace upvalue-based shell dispatch with OP_LUSH opcode

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Add a dedicated OP_LUSH A B instruction that loads shell C functions
directly from the registry, eliminating the need for upvalue allocation
in mainfunc(), upvalue population in lua_load(), and the fragile
LUSH_NUM_UPVALS heuristic. Every chunk no longer carries 4 extra
upvalues.
This commit is contained in:
Cormac Shannon
2026-03-12 22:47:25 +00:00
parent f88b17959f
commit f09a033160
9 changed files with 46 additions and 78 deletions
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13
linit.c
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@@ -45,18 +45,19 @@ static const luaL_Reg stdlibs[] = {
/*
** Store shell functions in a registry table at LUA_RIDX_LUSH.
** These are populated as upvalues on the main chunk by lua_load().
** Integer keys 1..4 hold the C functions (accessed by OP_LUSH).
** String key "builtins" holds the builtins table (set by luaopen_builtins).
*/
static void opencommand (lua_State *L) {
lua_createtable(L, 0, 5);
lua_createtable(L, LUSH_OP_COUNT, 1);
lua_pushcfunction(L, lushCmd_command);
lua_setfield(L, -2, "command");
lua_rawseti(L, -2, LUSH_OP_COMMAND + 1);
lua_pushcfunction(L, lushCmd_interactive);
lua_setfield(L, -2, "interactive");
lua_rawseti(L, -2, LUSH_OP_INTERACTIVE + 1);
lua_pushcfunction(L, lushCmd_getenv);
lua_setfield(L, -2, "getenv");
lua_rawseti(L, -2, LUSH_OP_GETENV + 1);
lua_pushcfunction(L, lushCmd_setenv);
lua_setfield(L, -2, "setenv");
lua_rawseti(L, -2, LUSH_OP_SETENV + 1);
lua_rawseti(L, LUA_REGISTRYINDEX, LUA_RIDX_LUSH);
}