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// Copyright 2018 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.
@export
struct Arguments {
const frame: FrameWithArguments;
const base: RawPtr;
// length is the number of arguments without the receiver.
const length: intptr;
// actual_count is the actual number of arguments on the stack (depending on
// kJSArgcIncludesReceiver may or may not include the receiver).
const actual_count: intptr;
}
extern operator '[]' macro GetArgumentValue(Arguments, intptr): JSAny;
extern macro GetFrameArguments(FrameWithArguments, intptr): Arguments;
struct ArgumentsIterator {
macro Next(): Object labels NoMore {
if (this.current == this.arguments.length) goto NoMore;
return this.arguments[this.current++];
}
const arguments: Arguments;
current: intptr;
}
struct FrameWithArgumentsInfo {
const frame: FrameWithArguments;
const argument_count: bint;
const formal_parameter_count: bint;
}
// Calculates and returns the frame pointer, argument count and formal
// parameter count to be used to access a function's parameters, taking
// argument adapter frames into account.
//
// TODO(danno):
// This macro is should only be used in builtins that can be called from
// interpreted or JITted code, not from CSA/Torque builtins (the number of
// returned formal parameters would be wrong).
// It is difficult to actually check/dcheck this, since interpreted or JITted
// frames are StandardFrames, but so are hand-written builtins. Doing that
// more refined check would be prohibitively expensive.
macro GetFrameWithArgumentsInfo(implicit context: Context)():
FrameWithArgumentsInfo {
const frame =
Cast<StandardFrame>(LoadParentFramePointer()) otherwise unreachable;
const f: JSFunction = frame.function;
const shared: SharedFunctionInfo = f.shared_function_info;
const formalParameterCount: bint = Convert<bint>(Convert<int32>(
LoadSharedFunctionInfoFormalParameterCountWithoutReceiver(shared)));
// TODO(victorgomes): When removing the v8_disable_arguments_adaptor flag,
// FrameWithArgumentsInfo can be simplified, since the frame field already
// contains the argument count.
const argumentCount: bint = Convert<bint>(frame.argument_count);
return FrameWithArgumentsInfo{
frame,
argument_count: argumentCount,
formal_parameter_count: formalParameterCount
};
}
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