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// Copyright 2021 the V8 project authors. All rights reserved.
// Use of this source code is governed by a BSD-style license that can be
// found in the LICENSE file.
#ifndef INCLUDE_V8_FUNCTION_H_
#define INCLUDE_V8_FUNCTION_H_
#include <stddef.h>
#include <stdint.h>
#include "v8-function-callback.h" // NOLINT(build/include_directory)
#include "v8-local-handle.h" // NOLINT(build/include_directory)
#include "v8-message.h" // NOLINT(build/include_directory)
#include "v8-object.h" // NOLINT(build/include_directory)
#include "v8-template.h" // NOLINT(build/include_directory)
#include "v8config.h" // NOLINT(build/include_directory)
namespace v8 {
class Context;
class Location;
class UnboundScript;
/**
* A JavaScript function object (ECMA-262, 15.3).
*/
class V8_EXPORT Function : public Object {
public:
/**
* Create a function in the current execution context
* for a given FunctionCallback.
*/
static MaybeLocal<Function> New(
Local<Context> context, FunctionCallback callback,
Local<Value> data = Local<Value>(), int length = 0,
ConstructorBehavior behavior = ConstructorBehavior::kAllow,
SideEffectType side_effect_type = SideEffectType::kHasSideEffect);
V8_WARN_UNUSED_RESULT MaybeLocal<Object> NewInstance(
Local<Context> context, int argc, Local<Value> argv[]) const;
V8_WARN_UNUSED_RESULT MaybeLocal<Object> NewInstance(
Local<Context> context) const {
return NewInstance(context, 0, nullptr);
}
/**
* When side effect checks are enabled, passing kHasNoSideEffect allows the
* constructor to be invoked without throwing. Calls made within the
* constructor are still checked.
*/
V8_WARN_UNUSED_RESULT MaybeLocal<Object> NewInstanceWithSideEffectType(
Local<Context> context, int argc, Local<Value> argv[],
SideEffectType side_effect_type = SideEffectType::kHasSideEffect) const;
V8_WARN_UNUSED_RESULT MaybeLocal<Value> Call(v8::Isolate* isolate,
Local<Context> context,
Local<Value> recv, int argc,
Local<Value> argv[]);
V8_WARN_UNUSED_RESULT MaybeLocal<Value> Call(Local<Context> context,
Local<Value> recv, int argc,
Local<Value> argv[]);
void SetName(Local<String> name);
Local<Value> GetName() const;
/**
* Name inferred from variable or property assignment of this function.
* Used to facilitate debugging and profiling of JavaScript code written
* in an OO style, where many functions are anonymous but are assigned
* to object properties.
*/
Local<Value> GetInferredName() const;
/**
* displayName if it is set, otherwise name if it is configured, otherwise
* function name, otherwise inferred name.
*/
Local<Value> GetDebugName() const;
/**
* Returns zero based line number of function body and
* kLineOffsetNotFound if no information available.
*/
int GetScriptLineNumber() const;
/**
* Returns zero based column number of function body and
* kLineOffsetNotFound if no information available.
*/
int GetScriptColumnNumber() const;
/**
* Returns zero based line and column number of function body, else returns
* {-1, -1}.
*/
Location GetScriptLocation() const;
/**
* Returns zero based start position (character offset) of function body and
* kLineOffsetNotFound if no information available.
*/
int GetScriptStartPosition() const;
/**
* Returns scriptId.
*/
int ScriptId() const;
/**
* Returns the original function if this function is bound, else returns
* v8::Undefined.
*/
Local<Value> GetBoundFunction() const;
/**
* Calls builtin Function.prototype.toString on this function.
* This is different from Value::ToString() that may call a user-defined
* toString() function, and different than Object::ObjectProtoToString() which
* always serializes "[object Function]".
*/
V8_WARN_UNUSED_RESULT MaybeLocal<String> FunctionProtoToString(
Local<Context> context);
/**
* Returns true if the function does nothing.
* The function returns false on error.
* Note that this function is experimental. Embedders should not rely on
* this existing. We may remove this function in the future.
*/
V8_WARN_UNUSED_RESULT bool Experimental_IsNopFunction() const;
ScriptOrigin GetScriptOrigin() const;
V8_INLINE static Function* Cast(Value* value) {
#ifdef V8_ENABLE_CHECKS
CheckCast(value);
#endif
return static_cast<Function*>(value);
}
static const int kLineOffsetNotFound;
private:
Function();
static void CheckCast(Value* obj);
};
} // namespace v8
#endif // INCLUDE_V8_FUNCTION_H_