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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.
struct Arguments {
const frame: FrameWithArguments;
const base: RawPtr;
const length: intptr;
}
extern operator '[]' macro GetArgumentValue(Arguments, intptr): Object;
extern macro GetFrameArguments(FrameWithArguments, intptr): Arguments;
namespace arguments {
struct ArgumentsInfo {
frame: Frame;
argument_count: bint;
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/assert this, since interpreted or JITted
// frames are StandardFrames, but so are hand-written builtins. Doing that
// more refined check would be prohibitively expensive.
@export
macro GetArgumentsFrameAndCount(implicit context: Context)(f: JSFunction):
ArgumentsInfo {
const frame: Frame = LoadParentFramePointer();
assert(frame.function == f);
const shared: SharedFunctionInfo = f.shared_function_info;
const formalParameterCount: bint =
Convert<bint>(Convert<int32>(shared.formal_parameter_count));
const argumentCount: bint = formalParameterCount;
const adaptor: ArgumentsAdaptorFrame =
Cast<ArgumentsAdaptorFrame>(frame.caller)
otherwise return ArgumentsInfo{
frame,
argument_count: argumentCount,
formal_parameter_count: formalParameterCount
};
return ArgumentsInfo{
frame: adaptor,
argument_count: Convert<bint>(adaptor.length),
formal_parameter_count: formalParameterCount
};
}
}
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