148 lines
5 KiB
C++
148 lines
5 KiB
C++
/*************************************************************************/
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/* javascript_eval.cpp */
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/*************************************************************************/
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/* This file is part of: */
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/* GODOT ENGINE */
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/* https://godotengine.org */
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/*************************************************************************/
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/* Copyright (c) 2007-2020 Juan Linietsky, Ariel Manzur. */
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/* Copyright (c) 2014-2020 Godot Engine contributors (cf. AUTHORS.md). */
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/* */
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/* Permission is hereby granted, free of charge, to any person obtaining */
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/* a copy of this software and associated documentation files (the */
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/* "Software"), to deal in the Software without restriction, including */
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/* without limitation the rights to use, copy, modify, merge, publish, */
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/* distribute, sublicense, and/or sell copies of the Software, and to */
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/* permit persons to whom the Software is furnished to do so, subject to */
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/* the following conditions: */
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/* */
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/* The above copyright notice and this permission notice shall be */
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/* included in all copies or substantial portions of the Software. */
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/* */
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/* THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, */
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/* EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF */
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/* MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT.*/
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/* IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY */
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/* CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT, */
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/* TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION WITH THE */
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/* SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE. */
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/*************************************************************************/
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#ifdef JAVASCRIPT_EVAL_ENABLED
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#include "api/javascript_eval.h"
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#include "emscripten.h"
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extern "C" EMSCRIPTEN_KEEPALIVE uint8_t *resize_PackedByteArray_and_open_write(PackedByteArray *p_arr, VectorWriteProxy<uint8_t> *r_write, int p_len) {
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p_arr->resize(p_len);
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*r_write = p_arr->write;
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return p_arr->ptrw();
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}
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Variant JavaScript::eval(const String &p_code, bool p_use_global_exec_context) {
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union {
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bool b;
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double d;
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char *s;
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} js_data;
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PackedByteArray arr;
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VectorWriteProxy<uint8_t> arr_write;
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/* clang-format off */
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Variant::Type return_type = static_cast<Variant::Type>(EM_ASM_INT({
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const CODE = $0;
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const USE_GLOBAL_EXEC_CONTEXT = $1;
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const PTR = $2;
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const BYTEARRAY_PTR = $3;
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const BYTEARRAY_WRITE_PTR = $4;
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var eval_ret;
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try {
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if (USE_GLOBAL_EXEC_CONTEXT) {
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// indirect eval call grants global execution context
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var global_eval = eval;
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eval_ret = global_eval(UTF8ToString(CODE));
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} else {
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eval_ret = eval(UTF8ToString(CODE));
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}
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} catch (e) {
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err(e);
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eval_ret = null;
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}
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switch (typeof eval_ret) {
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case 'boolean':
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setValue(PTR, eval_ret, 'i32');
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return 1; // BOOL
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case 'number':
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setValue(PTR, eval_ret, 'double');
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return 3; // FLOAT
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case 'string':
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var array_len = lengthBytesUTF8(eval_ret)+1;
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var array_ptr = _malloc(array_len);
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try {
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if (array_ptr===0) {
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throw new Error('String allocation failed (probably out of memory)');
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}
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setValue(PTR, array_ptr , '*');
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stringToUTF8(eval_ret, array_ptr, array_len);
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return 4; // STRING
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} catch (e) {
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if (array_ptr!==0) {
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_free(array_ptr)
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}
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err(e);
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// fall through
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}
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break;
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case 'object':
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if (eval_ret === null) {
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break;
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}
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if (ArrayBuffer.isView(eval_ret) && !(eval_ret instanceof Uint8Array)) {
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eval_ret = new Uint8Array(eval_ret.buffer);
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}
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else if (eval_ret instanceof ArrayBuffer) {
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eval_ret = new Uint8Array(eval_ret);
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}
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if (eval_ret instanceof Uint8Array) {
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var bytes_ptr = ccall('resize_PackedByteArray_and_open_write', 'number', ['number', 'number' ,'number'], [BYTEARRAY_PTR, BYTEARRAY_WRITE_PTR, eval_ret.length]);
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HEAPU8.set(eval_ret, bytes_ptr);
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return 20; // PACKED_BYTE_ARRAY
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}
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break;
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}
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return 0; // NIL
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}, p_code.utf8().get_data(), p_use_global_exec_context, &js_data, &arr, &arr_write));
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/* clang-format on */
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switch (return_type) {
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case Variant::BOOL:
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return js_data.b;
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case Variant::FLOAT:
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return js_data.d;
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case Variant::STRING: {
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String str = String::utf8(js_data.s);
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/* clang-format off */
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EM_ASM_({ _free($0); }, js_data.s);
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/* clang-format on */
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return str;
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}
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case Variant::PACKED_BYTE_ARRAY:
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arr_write = VectorWriteProxy<uint8_t>();
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return arr;
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default:
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return Variant();
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}
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}
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#endif // JAVASCRIPT_EVAL_ENABLED
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