qtdeclarative/src/v4/qv4functionobject.h

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#ifndef QV4FUNCTIONOBJECT_H
#define QV4FUNCTIONOBJECT_H

#include "qv4global.h"
#include "qv4runtime.h"
#include "qv4engine.h"
#include "qv4context.h"
#include "qv4object.h"
#include "qv4string.h"
#include "qv4codegen_p.h"
#include "qv4isel_p.h"
#include "qv4managed.h"
#include "qv4propertydescriptor.h"
#include "qv4objectiterator.h"
#include "qv4regexp.h"

#include <QtCore/QString>
#include <QtCore/QHash>
#include <QtCore/QScopedPointer>
#include <cstdio>
#include <cassert>

#include <config.h>
#include <assembler/MacroAssemblerCodeRef.h>

QT_BEGIN_NAMESPACE

namespace QQmlJS {
namespace VM {

struct Value;
struct Function;
struct Object;
struct ObjectIterator;
struct BooleanObject;
struct NumberObject;
struct StringObject;
struct ArrayObject;
struct DateObject;
struct FunctionObject;
struct RegExpObject;
struct ErrorObject;
struct ArgumentsObject;
struct ExecutionContext;
struct ExecutionEngine;
class MemoryManager;

struct ObjectPrototype;
struct StringPrototype;
struct NumberPrototype;
struct BooleanPrototype;
struct ArrayPrototype;
struct FunctionPrototype;
struct DatePrototype;
struct RegExpPrototype;
struct ErrorPrototype;
struct EvalErrorPrototype;
struct RangeErrorPrototype;
struct ReferenceErrorPrototype;
struct SyntaxErrorPrototype;
struct TypeErrorPrototype;
struct URIErrorPrototype;
struct InternalClass;

struct Lookup {
    enum { Size = 4 };
    InternalClass *classList[Size];
    int level;
    uint index;
    String *name;

    PropertyDescriptor *lookup(Object *obj) {
        int i = 0;
        while (i < level && obj && obj->internalClass == classList[i]) {
            obj = obj->prototype;
            ++i;
        }

        if (index != UINT_MAX && obj->internalClass == classList[i])
            return obj->memberData + index;

        while (i < Size && obj) {
            classList[i] = obj->internalClass;

            index = obj->internalClass->find(name);
            if (index != UINT_MAX) {
                level = i;
                return obj->memberData + index;
            }

            obj = obj->prototype;
            ++i;
        }
        level = i;

        while (obj) {
            index = obj->internalClass->find(name);
            if (index != UINT_MAX)
                return obj->memberData + index;

            obj = obj->prototype;
        }
        return 0;
    }

    PropertyDescriptor *setterLookup(Object *o) {
        if (o->internalClass == classList[0])
            return o->memberData + index;

        uint idx = o->internalClass->find(name);
        if (idx != UINT_MAX) {
            classList[0] = o->internalClass;
            index = idx;
            return o->memberData + index;
        }
        return 0;
    }
};

struct Function {
    String *name;

    VM::Value (*code)(VM::ExecutionContext *, const uchar *);
    const uchar *codeData;
    JSC::MacroAssemblerCodeRef codeRef;
    quint32 codeSize;
    QByteArray unwindInfo; // CIE+FDE on x86/x86-64. Stored directly in code on ARM.

    QVector<String *> formals;
    QVector<String *> locals;
    QVector<Value> generatedValues;
    QVector<String *> identifiers;
    QVector<Function *> nestedFunctions;
    Function *outer;

    Lookup *lookups;

    bool hasNestedFunctions;
    bool hasDirectEval;
    bool usesArgumentsObject;
    bool isStrict;
    bool isNamedExpression;

    Function(String *name)
        : name(name)
        , code(0)
        , codeData(0)
        , codeSize(0)
        , outer(0)
        , lookups(0)
        , hasNestedFunctions(0)
        , hasDirectEval(false)
        , usesArgumentsObject(false)
        , isStrict(false)
        , isNamedExpression(false)
    {}
    ~Function();

    inline bool needsActivation() const { return hasNestedFunctions || hasDirectEval || usesArgumentsObject; }

    void mark();
};

struct Q_V4_EXPORT FunctionObject: Object {
    ExecutionContext *scope;
    String *name;
    String * const *formalParameterList;
    String * const *varList;
    unsigned int formalParameterCount;
    unsigned int varCount;
    VM::Function *function;

    FunctionObject(ExecutionContext *scope);

    static Value construct(Managed *that, ExecutionContext *context, Value *args, int argc);
    static Value call(Managed *that, ExecutionContext *, const Value &, Value *, int);
    inline Value construct(ExecutionContext *context, Value *args, int argc) {
        return vtbl->construct(this, context, args, argc);
    }
    inline Value call(ExecutionContext *context, const Value &thisObject, Value *args, int argc) {
        return vtbl->call(this, context, thisObject, args, argc);
    }

protected:
    static const ManagedVTable static_vtbl;
    static void markObjects(Managed *that);
    static bool hasInstance(Managed *that, ExecutionContext *ctx, const Value &value);
};

struct FunctionCtor: FunctionObject
{
    FunctionCtor(ExecutionContext *scope);

    static Value construct(Managed *that, ExecutionContext *context, Value *args, int argc);
    static Value call(Managed *that, ExecutionContext *, const Value &, Value *, int);

protected:
    static const ManagedVTable static_vtbl;
};

struct FunctionPrototype: FunctionObject
{
    FunctionPrototype(ExecutionContext *ctx): FunctionObject(ctx) {}
    void init(ExecutionContext *ctx, const Value &ctor);

    static Value method_toString(CallContext *ctx);
    static Value method_apply(CallContext *ctx);
    static Value method_call(CallContext *ctx);
    static Value method_bind(CallContext *ctx);
};

struct BuiltinFunctionOld: FunctionObject {
    Value (*code)(CallContext *);

    BuiltinFunctionOld(ExecutionContext *scope, String *name, Value (*code)(CallContext *));

    static Value construct(Managed *, ExecutionContext *context, Value *args, int argc);
    static Value call(Managed *that, ExecutionContext *, const Value &, Value *, int);

protected:
    static const ManagedVTable static_vtbl;
};

struct BuiltinFunction: FunctionObject {
    Value (*code)(ExecutionContext *parentContext, Value thisObject, Value *args, int argc);

    BuiltinFunction(ExecutionContext *scope, String *name, Value (*code)(ExecutionContext *, Value, Value *, int));

    static Value construct(Managed *, ExecutionContext *context, Value *args, int argc);
    static Value call(Managed *that, ExecutionContext *, const Value &, Value *, int);

protected:
    static const ManagedVTable static_vtbl;
};

struct ScriptFunction: FunctionObject {
    ScriptFunction(ExecutionContext *scope, VM::Function *function);

    static Value construct(Managed *, ExecutionContext *context, Value *args, int argc);
    static Value call(Managed *that, ExecutionContext *, const Value &, Value *, int);

protected:
    static const ManagedVTable static_vtbl;
};

struct BoundFunction: FunctionObject {
    FunctionObject *target;
    Value boundThis;
    QVector<Value> boundArgs;

    BoundFunction(ExecutionContext *scope, FunctionObject *target, Value boundThis, const QVector<Value> &boundArgs);
    ~BoundFunction() {}


    static Value construct(Managed *, ExecutionContext *context, Value *args, int argc);
    static Value call(Managed *that, ExecutionContext *, const Value &, Value *, int);

    static const ManagedVTable static_vtbl;
    static void destroy(Managed *);
    static void markObjects(Managed *that);
    static bool hasInstance(Managed *that, ExecutionContext *ctx, const Value &value);
};

} // namespace VM
} // namespace QQmlJS

QT_END_NAMESPACE

#endif // QMLJS_OBJECTS_H