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/*
** Load and dump code.
** Copyright (C) 2005-2022 Mike Pall. See Copyright Notice in luajit.h
*/
#include <errno.h>
#include <stdio.h>
#define lj_load_c
#define LUA_CORE
#include "lua.h"
#include "lauxlib.h"
#include "lj_obj.h"
#include "lj_gc.h"
#include "lj_err.h"
#include "lj_buf.h"
#include "lj_func.h"
#include "lj_frame.h"
#include "lj_vm.h"
#include "lj_lex.h"
#include "lj_bcdump.h"
#include "lj_parse.h"
/* -- Load Lua source code and bytecode ----------------------------------- */
static TValue *cpparser(lua_State *L, lua_CFunction dummy, void *ud)
{
LexState *ls = (LexState *)ud;
GCproto *pt;
GCfunc *fn;
int bc;
UNUSED(dummy);
cframe_errfunc(L->cframe) = -1; /* Inherit error function. */
bc = lj_lex_setup(L, ls);
if (ls->mode && !strchr(ls->mode, bc ? 'b' : 't')) {
setstrV(L, L->top++, lj_err_str(L, LJ_ERR_XMODE));
lj_err_throw(L, LUA_ERRSYNTAX);
}
pt = bc ? lj_bcread(ls) : lj_parse(ls);
fn = lj_func_newL_empty(L, pt, tabref(L->env));
/* Don't combine above/below into one statement. */
setfuncV(L, L->top++, fn);
return NULL;
}
LUA_API int lua_loadx(lua_State *L, lua_Reader reader, void *data,
const char *chunkname, const char *mode)
{
LexState ls;
int status;
ls.rfunc = reader;
ls.rdata = data;
ls.chunkarg = chunkname ? chunkname : "?";
ls.mode = mode;
lj_buf_init(L, &ls.sb);
status = lj_vm_cpcall(L, NULL, &ls, cpparser);
lj_lex_cleanup(L, &ls);
lj_gc_check(L);
return status;
}
LUA_API int lua_load(lua_State *L, lua_Reader reader, void *data,
const char *chunkname)
{
return lua_loadx(L, reader, data, chunkname, NULL);
}
typedef struct FileReaderCtx {
FILE *fp;
char buf[LUAL_BUFFERSIZE];
} FileReaderCtx;
static const char *reader_file(lua_State *L, void *ud, size_t *size)
{
FileReaderCtx *ctx = (FileReaderCtx *)ud;
UNUSED(L);
if (feof(ctx->fp)) return NULL;
*size = fread(ctx->buf, 1, sizeof(ctx->buf), ctx->fp);
return *size > 0 ? ctx->buf : NULL;
}
LUALIB_API int luaL_loadfilex(lua_State *L, const char *filename,
const char *mode)
{
FileReaderCtx ctx;
int status;
const char *chunkname;
if (filename) {
ctx.fp = fopen(filename, "rb");
if (ctx.fp == NULL) {
lua_pushfstring(L, "cannot open %s: %s", filename, strerror(errno));
return LUA_ERRFILE;
}
chunkname = lua_pushfstring(L, "@%s", filename);
} else {
ctx.fp = stdin;
chunkname = "=stdin";
}
status = lua_loadx(L, reader_file, &ctx, chunkname, mode);
if (ferror(ctx.fp)) {
L->top -= filename ? 2 : 1;
lua_pushfstring(L, "cannot read %s: %s", chunkname+1, strerror(errno));
if (filename)
fclose(ctx.fp);
return LUA_ERRFILE;
}
if (filename) {
L->top--;
copyTV(L, L->top-1, L->top);
fclose(ctx.fp);
}
return status;
}
LUALIB_API int luaL_loadfile(lua_State *L, const char *filename)
{
return luaL_loadfilex(L, filename, NULL);
}
typedef struct StringReaderCtx {
const char *str;
size_t size;
} StringReaderCtx;
static const char *reader_string(lua_State *L, void *ud, size_t *size)
{
StringReaderCtx *ctx = (StringReaderCtx *)ud;
UNUSED(L);
if (ctx->size == 0) return NULL;
*size = ctx->size;
ctx->size = 0;
return ctx->str;
}
LUALIB_API int luaL_loadbufferx(lua_State *L, const char *buf, size_t size,
const char *name, const char *mode)
{
StringReaderCtx ctx;
ctx.str = buf;
ctx.size = size;
return lua_loadx(L, reader_string, &ctx, name, mode);
}
LUALIB_API int luaL_loadbuffer(lua_State *L, const char *buf, size_t size,
const char *name)
{
return luaL_loadbufferx(L, buf, size, name, NULL);
}
LUALIB_API int luaL_loadstring(lua_State *L, const char *s)
{
return luaL_loadbuffer(L, s, strlen(s), s);
}
/* -- Dump bytecode ------------------------------------------------------- */
LUA_API int lua_dump(lua_State *L, lua_Writer writer, void *data)
{
cTValue *o = L->top-1;
lj_checkapi(L->top > L->base, "top slot empty");
if (tvisfunc(o) && isluafunc(funcV(o)))
return lj_bcwrite(L, funcproto(funcV(o)), writer, data, 0);
else
return 1;
}
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