Node* emitCodeToGetArgumentsArrayLength(
InsertionSet& insertionSet, Node* arguments, unsigned nodeIndex, NodeOrigin origin)
{
Graph& graph = insertionSet.graph();
DFG_ASSERT(
graph, arguments,
arguments->op() == CreateDirectArguments || arguments->op() == CreateScopedArguments
|| arguments->op() == CreateClonedArguments || arguments->op() == PhantomDirectArguments
|| arguments->op() == PhantomClonedArguments);
InlineCallFrame* inlineCallFrame = arguments->origin.semantic.inlineCallFrame;
if (inlineCallFrame && !inlineCallFrame->isVarargs()) {
return insertionSet.insertConstant(
nodeIndex, origin, jsNumber(inlineCallFrame->arguments.size() - 1));
}
Node* argumentCount;
if (!inlineCallFrame)
argumentCount = insertionSet.insertNode(nodeIndex, SpecInt32, GetArgumentCount, origin);
else {
VirtualRegister argumentCountRegister(inlineCallFrame->stackOffset + JSStack::ArgumentCount);
argumentCount = insertionSet.insertNode(
nodeIndex, SpecInt32, GetStack, origin,
OpInfo(graph.m_stackAccessData.add(argumentCountRegister, FlushedInt32)));
}
return insertionSet.insertNode(
nodeIndex, SpecInt32, ArithSub, origin, OpInfo(Arith::Unchecked),
Edge(argumentCount, Int32Use),
insertionSet.insertConstantForUse(
nodeIndex, origin, jsNumber(1), Int32Use));
}
Node* emitCodeToGetArgumentsArrayLength(
InsertionSet& insertionSet, Node* arguments, unsigned nodeIndex, NodeOrigin origin)
{
Graph& graph = insertionSet.graph();
DFG_ASSERT(
graph, arguments,
arguments->op() == CreateDirectArguments || arguments->op() == CreateScopedArguments
|| arguments->op() == CreateClonedArguments || arguments->op() == CreateRest
|| arguments->op() == PhantomDirectArguments || arguments->op() == PhantomClonedArguments || arguments->op() == PhantomCreateRest);
InlineCallFrame* inlineCallFrame = arguments->origin.semantic.inlineCallFrame;
unsigned numberOfArgumentsToSkip = 0;
if (arguments->op() == CreateRest || arguments->op() == PhantomCreateRest)
numberOfArgumentsToSkip = arguments->numberOfArgumentsToSkip();
if (inlineCallFrame && !inlineCallFrame->isVarargs()) {
unsigned argumentsSize = inlineCallFrame->arguments.size() - 1;
if (argumentsSize >= numberOfArgumentsToSkip)
argumentsSize -= numberOfArgumentsToSkip;
else
argumentsSize = 0;
return insertionSet.insertConstant(
nodeIndex, origin, jsNumber(argumentsSize));
}
Node* argumentCount;
if (!inlineCallFrame)
argumentCount = insertionSet.insertNode(nodeIndex, SpecInt32Only, GetArgumentCountIncludingThis, origin);
else {
VirtualRegister argumentCountRegister(inlineCallFrame->stackOffset + CallFrameSlot::argumentCount);
argumentCount = insertionSet.insertNode(
nodeIndex, SpecInt32Only, GetStack, origin,
OpInfo(graph.m_stackAccessData.add(argumentCountRegister, FlushedInt32)));
}
Node* result = insertionSet.insertNode(
nodeIndex, SpecInt32Only, ArithSub, origin, OpInfo(Arith::Unchecked),
Edge(argumentCount, Int32Use),
insertionSet.insertConstantForUse(
nodeIndex, origin, jsNumber(1 + numberOfArgumentsToSkip), Int32Use));
if (numberOfArgumentsToSkip) {
// The above subtraction may produce a negative number if this number is non-zero. We correct that here.
result = insertionSet.insertNode(
nodeIndex, SpecInt32Only, ArithMax, origin,
Edge(result, Int32Use),
insertionSet.insertConstantForUse(nodeIndex, origin, jsNumber(0), Int32Use));
result->setResult(NodeResultInt32);
}
return result;
}