a5be5c995c9672e4429172f705f22948c03067ac
[WebKit-https.git] / Source / JavaScriptCore / builtins / BuiltinExecutables.cpp
1 /*
2  * Copyright (C) 2014 Apple Inc. All rights reserved.
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5  * modification, are permitted provided that the following conditions
6  * are met:
7  * 1. Redistributions of source code must retain the above copyright
8  *    notice, this list of conditions and the following disclaimer.
9  * 2. Redistributions in binary form must reproduce the above copyright
10  *    notice, this list of conditions and the following disclaimer in the
11  *    documentation and/or other materials provided with the distribution.
12  *
13  * THIS SOFTWARE IS PROVIDED BY APPLE INC. ``AS IS'' AND ANY
14  * EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
15  * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
16  * PURPOSE ARE DISCLAIMED.  IN NO EVENT SHALL APPLE INC. OR
17  * CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL,
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23  * OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
24  */
25
26
27 #include "config.h"
28 #include "BuiltinExecutables.h"
29
30 #include "BuiltinNames.h"
31 #include "JSCInlines.h"
32 #include "Parser.h"
33 #include <wtf/NeverDestroyed.h>
34
35 namespace JSC {
36
37 BuiltinExecutables::BuiltinExecutables(VM& vm)
38     : m_vm(vm)
39 #define INITIALIZE_BUILTIN_SOURCE_MEMBERS(name, functionName, length) , m_##name##Source(makeSource(StringImpl::createFromLiteral(s_##name, length), { }))
40     JSC_FOREACH_BUILTIN_CODE(INITIALIZE_BUILTIN_SOURCE_MEMBERS)
41 #undef EXPOSE_BUILTIN_STRINGS
42 {
43 }
44
45 UnlinkedFunctionExecutable* BuiltinExecutables::createDefaultConstructor(ConstructorKind constructorKind, const Identifier& name)
46 {
47     static NeverDestroyed<const String> baseConstructorCode(ASCIILiteral("(function () { })"));
48     static NeverDestroyed<const String> derivedConstructorCode(ASCIILiteral("(function (...args) { super(...args); })"));
49
50     switch (constructorKind) {
51     case ConstructorKind::None:
52         break;
53     case ConstructorKind::Base:
54         return createExecutable(m_vm, makeSource(baseConstructorCode, { }), name, constructorKind, ConstructAbility::CanConstruct);
55     case ConstructorKind::Extends:
56         return createExecutable(m_vm, makeSource(derivedConstructorCode, { }), name, constructorKind, ConstructAbility::CanConstruct);
57     }
58     ASSERT_NOT_REACHED();
59     return nullptr;
60 }
61
62 UnlinkedFunctionExecutable* BuiltinExecutables::createBuiltinExecutable(const SourceCode& code, const Identifier& name, ConstructAbility constructAbility)
63 {
64     return createExecutable(m_vm, code, name, ConstructorKind::None, constructAbility);
65 }
66
67 UnlinkedFunctionExecutable* createBuiltinExecutable(VM& vm, const SourceCode& code, const Identifier& name, ConstructAbility constructAbility)
68 {
69     return BuiltinExecutables::createExecutable(vm, code, name, ConstructorKind::None, constructAbility);
70 }
71
72 UnlinkedFunctionExecutable* BuiltinExecutables::createExecutable(VM& vm, const SourceCode& source, const Identifier& name, ConstructorKind constructorKind, ConstructAbility constructAbility)
73 {
74     JSTextPosition positionBeforeLastNewline;
75     ParserError error;
76     bool isParsingDefaultConstructor = constructorKind != ConstructorKind::None;
77     JSParserBuiltinMode builtinMode = isParsingDefaultConstructor ? JSParserBuiltinMode::NotBuiltin : JSParserBuiltinMode::Builtin;
78     UnlinkedFunctionKind kind = isParsingDefaultConstructor ? UnlinkedNormalFunction : UnlinkedBuiltinFunction;
79     SourceCode parentSourceOverride = isParsingDefaultConstructor ? source : SourceCode();
80     std::unique_ptr<ProgramNode> program = parse<ProgramNode>(
81         &vm, source, Identifier(), builtinMode,
82         JSParserStrictMode::NotStrict, JSParserScriptMode::Classic, SourceParseMode::ProgramMode, SuperBinding::NotNeeded, error,
83         &positionBeforeLastNewline, constructorKind);
84
85     if (!program) {
86         dataLog("Fatal error compiling builtin function '", name.string(), "': ", error.message());
87         CRASH();
88     }
89
90     StatementNode* exprStatement = program->singleStatement();
91     RELEASE_ASSERT(exprStatement);
92     RELEASE_ASSERT(exprStatement->isExprStatement());
93     ExpressionNode* funcExpr = static_cast<ExprStatementNode*>(exprStatement)->expr();
94     RELEASE_ASSERT(funcExpr);
95     RELEASE_ASSERT(funcExpr->isFuncExprNode());
96     FunctionMetadataNode* metadata = static_cast<FuncExprNode*>(funcExpr)->metadata();
97     RELEASE_ASSERT(!program->hasCapturedVariables());
98     
99     metadata->setEndPosition(positionBeforeLastNewline);
100     RELEASE_ASSERT(metadata);
101     RELEASE_ASSERT(metadata->ident().isNull());
102     
103     // This function assumes an input string that would result in a single anonymous function expression.
104     metadata->setEndPosition(positionBeforeLastNewline);
105     RELEASE_ASSERT(metadata);
106     metadata->overrideName(name);
107     VariableEnvironment dummyTDZVariables;
108     UnlinkedFunctionExecutable* functionExecutable = UnlinkedFunctionExecutable::create(&vm, source, metadata, kind, constructAbility, JSParserScriptMode::Classic, dummyTDZVariables, DerivedContextType::None, WTFMove(parentSourceOverride));
109     return functionExecutable;
110 }
111
112 void BuiltinExecutables::finalize(Handle<Unknown>, void* context)
113 {
114     static_cast<Weak<UnlinkedFunctionExecutable>*>(context)->clear();
115 }
116
117 #define DEFINE_BUILTIN_EXECUTABLES(name, functionName, length) \
118 UnlinkedFunctionExecutable* BuiltinExecutables::name##Executable() \
119 {\
120     if (!m_##name##Executable)\
121         m_##name##Executable = Weak<UnlinkedFunctionExecutable>(createBuiltinExecutable(m_##name##Source, m_vm.propertyNames->builtinNames().functionName##PublicName(), s_##name##ConstructAbility), this, &m_##name##Executable);\
122     return m_##name##Executable.get();\
123 }
124 JSC_FOREACH_BUILTIN_CODE(DEFINE_BUILTIN_EXECUTABLES)
125 #undef EXPOSE_BUILTIN_SOURCES
126
127 }