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FunctionObject.cpp
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/*
* Copyright (c) 2016-present Samsung Electronics Co., Ltd
*
* This library is free software; you can redistribute it and/or
* modify it under the terms of the GNU Lesser General Public
* License as published by the Free Software Foundation; either
* version 2.1 of the License, or (at your option) any later version.
*
* This library is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
* Lesser General Public License for more details.
*
* You should have received a copy of the GNU Lesser General Public
* License along with this library; if not, write to the Free Software
* Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301
* USA
*/
#include "Escargot.h"
#include "FunctionObject.h"
#include "runtime/VMInstance.h"
#include "runtime/Context.h"
#include "runtime/ReloadableString.h"
#include "interpreter/ByteCode.h"
#include "parser/Script.h"
#include "parser/ast/ProgramNode.h"
#include "parser/esprima_cpp/esprima.h"
#include "runtime/Environment.h"
#include "runtime/EnvironmentRecord.h"
namespace Escargot {
void FunctionObject::initStructureAndValues(ExecutionState& state, bool isConstructor, bool isGenerator)
{
if (isGenerator) {
// Unlike function instances, the object that is the value of the GeneratorFunction’s of AsyncGeneratorFunction prototype property
// does not have a constructor property whose value is the GeneratorFunction or the AsyncGeneratorFunction instance.
m_structure = state.context()->defaultStructureForFunctionObject();
ASSERT(ESCARGOT_OBJECT_BUILTIN_PROPERTY_NUMBER + 0 < m_structure->propertyCount());
ASSERT(ESCARGOT_OBJECT_BUILTIN_PROPERTY_NUMBER + 1 < m_structure->propertyCount());
ASSERT(ESCARGOT_OBJECT_BUILTIN_PROPERTY_NUMBER + 2 < m_structure->propertyCount());
m_values[ESCARGOT_OBJECT_BUILTIN_PROPERTY_NUMBER + 0] = ObjectPropertyValue::EmptyValue; // lazy init on VMInstance::functionPrototypeNativeGetter
m_values[ESCARGOT_OBJECT_BUILTIN_PROPERTY_NUMBER + 1] = (Value(m_codeBlock->functionLength()));
m_values[ESCARGOT_OBJECT_BUILTIN_PROPERTY_NUMBER + 2] = (Value(m_codeBlock->functionName().string()));
} else {
if (isConstructor) {
m_structure = state.context()->defaultStructureForFunctionObject();
ASSERT(ESCARGOT_OBJECT_BUILTIN_PROPERTY_NUMBER + 0 < m_structure->propertyCount());
ASSERT(ESCARGOT_OBJECT_BUILTIN_PROPERTY_NUMBER + 1 < m_structure->propertyCount());
ASSERT(ESCARGOT_OBJECT_BUILTIN_PROPERTY_NUMBER + 2 < m_structure->propertyCount());
m_values[ESCARGOT_OBJECT_BUILTIN_PROPERTY_NUMBER + 0] = ObjectPropertyValue::EmptyValue; // lazy init on VMInstance::functionPrototypeNativeGetter
m_values[ESCARGOT_OBJECT_BUILTIN_PROPERTY_NUMBER + 1] = (Value(m_codeBlock->functionLength()));
m_values[ESCARGOT_OBJECT_BUILTIN_PROPERTY_NUMBER + 2] = (Value(m_codeBlock->functionName().string()));
} else {
m_structure = state.context()->defaultStructureForNotConstructorFunctionObject();
ASSERT(ESCARGOT_OBJECT_BUILTIN_PROPERTY_NUMBER + 0 < m_structure->propertyCount());
ASSERT(ESCARGOT_OBJECT_BUILTIN_PROPERTY_NUMBER + 1 < m_structure->propertyCount());
m_values[ESCARGOT_OBJECT_BUILTIN_PROPERTY_NUMBER + 0] = (Value(m_codeBlock->functionLength()));
m_values[ESCARGOT_OBJECT_BUILTIN_PROPERTY_NUMBER + 1] = (Value(m_codeBlock->functionName().string()));
}
}
}
// function for derived classes. derived class MUST initlize member variable of FunctionObject.
FunctionObject::FunctionObject(ExecutionState& state, Object* proto, size_t defaultSpace)
: DerivedObject(state, proto, defaultSpace)
, m_codeBlock(nullptr)
{
}
FunctionObject::FunctionObject(ObjectStructure* structure, ObjectPropertyValueVector&& values, Object* proto)
: DerivedObject(structure, std::move(values), proto)
, m_codeBlock(nullptr)
{
}
static String* createFunctionSource(ExecutionState& state, AtomicString functionName, size_t argCount, Value* argArray, Value bodyValue, bool useStrict, bool isGenerator, bool isAsync, bool isInternalSource)
{
StringBuilder src, parameters;
if (useStrict) {
src.appendString("'use strict'; ");
}
if (isGenerator && isAsync) {
src.appendString("async function* ");
} else if (isGenerator) {
src.appendString("function* ");
} else if (isAsync) {
src.appendString("async function ");
} else {
src.appendString("function ");
}
// function name
src.appendString(functionName.string());
{
// function parameters
parameters.appendString("(");
for (size_t i = 0; i < argCount; i++) {
String* p = argArray[i].toString(state);
parameters.appendString(p);
if (i != argCount - 1) {
parameters.appendString(",");
}
}
parameters.appendString("\n)");
}
String* parameterStr = parameters.finalize(&state);
String* originBodyStr = bodyValue.toString(state);
String* scriptSource = nullptr;
#if defined(ENABLE_RELOADABLE_STRING)
if (UNLIKELY(originBodyStr->isReloadableString())) {
src.appendString(parameterStr);
src.appendString(" {\n");
String* headStr = src.finalize(&state);
bool is8Bit = headStr->has8BitContent() && originBodyStr->has8BitContent();
const char tail[] = "\n}";
class ReloadableStringData : public gc {
public:
ReloadableStringData(String* head, ReloadableString* body)
: m_head(head)
, m_body(body)
, m_dest(nullptr)
{
}
String* m_head;
ReloadableString* m_body;
ReloadableString* m_dest;
};
ReloadableStringData* data = new ReloadableStringData(headStr, originBodyStr->asReloadableString());
scriptSource = new ReloadableString(state.context()->vmInstance(), is8Bit, headStr->length() + originBodyStr->length() + sizeof(tail) - 1,
data, [](void* callbackData) -> void* {
ReloadableStringData* data = reinterpret_cast<ReloadableStringData*>(callbackData);
bool is8Bit = data->m_dest->has8BitContent();
char* dest = reinterpret_cast<char*>(malloc((data->m_dest->length()) * (is8Bit ? 1 : 2)));
{
auto headAccessData = data->m_head->bufferAccessData();
auto bodyAccessData = data->m_body->bufferAccessData();
if (is8Bit) {
ASSERT(headAccessData.has8BitContent && bodyAccessData.has8BitContent);
char* ptr = dest;
memcpy(ptr, headAccessData.bufferAs8Bit, headAccessData.length);
ptr += headAccessData.length;
memcpy(ptr, bodyAccessData.bufferAs8Bit, bodyAccessData.length);
ptr += bodyAccessData.length;
ptr[0] = '\n';
ptr[1] = '}';
} else {
char16_t* ptr = reinterpret_cast<char16_t*>(dest);
if (headAccessData.has8BitContent) {
for (size_t i = 0; i < headAccessData.length; i++) {
ptr[i] = headAccessData.charAt(i);
}
} else {
memcpy(ptr, headAccessData.bufferAs16Bit, headAccessData.length * 2);
}
ptr += headAccessData.length;
if (bodyAccessData.has8BitContent) {
for (size_t i = 0; i < bodyAccessData.length; i++) {
ptr[i] = bodyAccessData.charAt(i);
}
} else {
memcpy(ptr, bodyAccessData.bufferAs16Bit, bodyAccessData.length * 2);
}
ptr += bodyAccessData.length;
ptr[0] = '\n';
ptr[1] = '}';
}
}
// unload original body source immediately
data->m_body->unload();
return dest; }, [](void* memoryPtr, void* callbackData) { free(memoryPtr); });
data->m_dest = scriptSource->asReloadableString();
} else
#endif
{
StringBuilder body;
body.appendString(" {\n");
body.appendString(originBodyStr);
body.appendString("\n}");
String* bodyStr = body.finalize(&state);
#if defined(ESCARGOT_ENABLE_TEST)
// simple syntax check for dynamic generated function except internal source
// to check rare erratic formats e.g. Function('){ function foo(', '}')
// this check is enabled only for test mode because it requires double-parsing which may affect the overall performance
if (!isInternalSource) {
GC_disable();
try {
esprima::simpleSyntaxCheckFunctionElements(state.context(), parameterStr, bodyStr, useStrict, isGenerator, isAsync);
// reset ASTAllocator
state.context()->astAllocator().reset();
GC_enable();
} catch (esprima::Error* syntaxError) {
String* errorMessage = syntaxError->message;
// reset ASTAllocator
state.context()->astAllocator().reset();
GC_enable();
delete syntaxError;
ErrorObject::throwBuiltinError(state, ErrorCode::SyntaxError, errorMessage);
}
}
#endif
src.appendString(parameterStr);
src.appendString(bodyStr);
scriptSource = src.finalize(&state);
}
return scriptSource;
}
FunctionObject::FunctionSource FunctionObject::createDynamicFunctionScript(ExecutionState& state, AtomicString functionName, size_t argCount, Value* argArray, Value bodyValue, bool useStrict, bool isGenerator, bool isAsync, bool allowSuperCall, bool isInternalSource, String* sourceName)
{
String* scriptSource = createFunctionSource(state, functionName, argCount, argArray, bodyValue, useStrict, isGenerator, isAsync, isInternalSource);
ScriptParser parser(state.context());
String* srcName = sourceName;
// find srcName through outer script except internal source
if (!isInternalSource && !srcName->length()) {
auto script = state.resolveOuterScript();
if (script) {
srcName = script->srcName();
}
}
Script* script = parser.initializeScript(nullptr, 0, scriptSource, srcName, nullptr, false, false, false, false, false, allowSuperCall, false, true, false).scriptThrowsExceptionIfParseError(state);
InterpretedCodeBlock* cb = script->topCodeBlock()->childBlockAt(0);
// mark it as dynamic code
cb->setDynamicSourceCode();
LexicalEnvironment* globalEnvironment = new LexicalEnvironment(new GlobalEnvironmentRecord(state, script->topCodeBlock(), state.context()->globalObject(), state.context()->globalDeclarativeRecord(), state.context()->globalDeclarativeStorage()), nullptr);
FunctionObject::FunctionSource fs;
fs.script = script;
fs.codeBlock = cb;
fs.outerEnvironment = globalEnvironment;
return fs;
}
ScriptParser::InitializeScriptResult FunctionObject::createFunctionScript(ExecutionState& state, String* sourceName, AtomicString functionName, size_t argCount, Value* argArray, Value bodyString, bool useStrict)
{
String* sourceBodyString = bodyString.toString(state);
ASSERT(sourceBodyString->length());
String* scriptSource = createFunctionSource(state, functionName, argCount, argArray, bodyString, useStrict, false, false, false);
ScriptParser parser(state.context());
// originLineOffset is set to 2 because `createFunctionSource` adds 2 lines at start
auto result = parser.initializeScript(sourceBodyString, 2, scriptSource, sourceName, nullptr, false, false, false, false, false, false, false, true
#ifdef ESCARGOT_DEBUGGER
// in debugger mode, all bytecodes should be compiled at once
,
true
#else
,
false
#endif
);
return result;
}
bool FunctionObject::setName(AtomicString name)
{
// re-set function name is allowed only for native function or dynamically created function except class constructor
ASSERT(!!m_codeBlock);
if (m_codeBlock->isInterpretedCodeBlock()) {
InterpretedCodeBlock* cb = m_codeBlock->asInterpretedCodeBlock();
if (!cb->hasDynamicSourceCode() || cb->isClassConstructor()) {
return false;
}
}
// set function name property
size_t nameIndex = functionNameIndex();
m_values[nameIndex] = Value(name.string());
// set function name in CodeBlock
m_codeBlock->setFunctionName(name);
return true;
}
} // namespace Escargot