private CFGNode ProcessCFGNode(
CFGNode calleeNode, CFGNode callerNode,
CFGNode callerSuccessorNode,
IExpression thisReplacement,
IExpression returnValueTarget,
MethodCompileInfo calleeMethodCompileInfo,
MethodCompileInfo callerMethodCompileInfo,
Dictionary<string, VariableDefinition> renamedLocalsMap,
Dictionary<string, VariableReference> variableReplacements,
Dictionary<string, IExpression> argumentReplacements,
Dictionary<CFGNode, CFGNode> processedNodes,
CFGNodeSet newNodes
)
{
CFGNode inlinedNode;
if (processedNodes.TryGetValue(calleeNode, out inlinedNode))
{
// we've already seen this node
// don't inline it again otherwise we'll end up in an infinite recursion
return inlinedNode;
}
CFG cfg = callerNode.Graph;
inlinedNode = cfg.AddNode();
inlinedNode.FlowControl = calleeNode.FlowControl;
inlinedNode.BasicBlock = CodeUtility.CloneCode<BasicBlock>(calleeNode.BasicBlock);
processedNodes[calleeNode] = inlinedNode;
newNodes.Add(inlinedNode);
Debug.Assert(
inlinedNode.BasicBlock.Statements.Count == calleeNode.BasicBlock.Statements.Count,
string.Format("Clone code produced {0} statements instead of {1}", inlinedNode.BasicBlock.Statements.Count, calleeNode.BasicBlock.Statements.Count)
);
// rename all variables in callee so they don't clash with variables in caller
CodeUtility.MatchAndReplaceCode<IVariableReferenceExpression>(
inlinedNode.BasicBlock,
delegate(IVariableReferenceExpression expression)
{
return true;
},
delegate(IVariableReferenceExpression expression)
{
VariableReference variableReplacement;
if (!variableReplacements.TryGetValue(expression.Variable.Name, out variableReplacement))
{
if (callerMethodCompileInfo.IsTemporary(expression.Variable))
{
variableReplacement = callerMethodCompileInfo.NewTemporary(expression.Variable.VariableType);
}
else if (callerMethodCompileInfo.IsFrozen(expression.Variable))
{
variableReplacement = callerMethodCompileInfo.NewFrozen(expression.Variable.VariableType);
}
else
{
VariableDefinition variableDefinition;
if (!renamedLocalsMap.TryGetValue(expression.Variable.Name, out variableDefinition))
{
int index = callerMethodCompileInfo.Method.Body.Variables.Count;
string name = "V_" + index; // TODO: Extract into constant and helper method
TypeReference type = expression.Variable.VariableType;
variableDefinition = new VariableDefinition(name, index, callerMethodCompileInfo.Method, type);
callerMethodCompileInfo.Method.Body.Variables.Add(variableDefinition);
renamedLocalsMap[expression.Variable.Name] = variableDefinition;
}
variableReplacement = variableDefinition;
}
variableReplacements[expression.Variable.Name] = variableReplacement;
}
expression.Variable = variableReplacement;
return expression;
},
true
);
// replace all instances of "this" in callee with the target object
if (thisReplacement != null)
{
CodeUtility.MatchAndReplaceCode<IExpression>(
inlinedNode.BasicBlock,
delegate(IExpression expression)
{
return expression is IThisReferenceExpression;
},
delegate(IExpression expression)
{
return thisReplacement;
},
true
);
}
// replace all arguments references
if (argumentReplacements != null)
{
CodeUtility.MatchAndReplaceCode<IExpression>(
inlinedNode.BasicBlock,
delegate(IExpression expression)
{
return expression is IArgumentReferenceExpression;
},
delegate(IExpression expression)
{
IArgumentReferenceExpression argumentReferenceExpression = (IArgumentReferenceExpression)expression;
IExpression replacementExpression;
if (!argumentReplacements.TryGetValue(argumentReferenceExpression.Parameter.Name, out replacementExpression))
{
throw new CompilerException(
string.Format(
"Error while inlining call to {0}. Could not find argument replacement for parameter \"{1}\". Parameter sequence is {2}.",
calleeMethodCompileInfo.Method,
argumentReferenceExpression.Parameter.Name,
argumentReferenceExpression.Parameter.Sequence
)
);
}
else
{
return replacementExpression;
}
},
true
);
}
if (inlinedNode.FlowControl == FlowControl.Throw)
{
// TODO: fixup exception handling info
throw new CannotInlineMethodException("Contain throw statement");
}
else if (inlinedNode.FlowControl == FlowControl.ConditionalBranch)
{
// TODO: Fix this so that conditioanl branches can be inlined
throw new CannotInlineMethodException("Contains a conditional branch");
}
else if (inlinedNode.FlowControl == FlowControl.Return)
{
// replace return statement with assignment to variable being assigned to in caller
Debug.Assert(inlinedNode.BasicBlock.Statements.Count == 1, string.Format("Return basic block has {0} statements", inlinedNode.BasicBlock.Statements.Count));
Debug.Assert(inlinedNode.BasicBlock.Statements[0] is IMethodReturnStatement);
IMethodReturnStatement methodReturnStatement = (IMethodReturnStatement)inlinedNode.BasicBlock.Statements[0];
inlinedNode.BasicBlock.Statements.Clear();
inlinedNode.BasicBlock.Statements.Add(new AssignStatement(returnValueTarget, methodReturnStatement.Expression));
// add edge between this return node and the caller node's successor
Debug.Assert(inlinedNode.SuccessorCount == 0);
Debug.Assert(callerSuccessorNode != null);
cfg.AddEdge(inlinedNode, callerSuccessorNode);
// flow control is no longer return
inlinedNode.FlowControl = FlowControl.Next;
}
foreach (CFGEdge outEdge in calleeNode.Graph.OutEdges(calleeNode))
{
CFGNode newSuccessorNode = ProcessCFGNode(
outEdge.Target, callerNode, callerSuccessorNode,
thisReplacement, returnValueTarget,
calleeMethodCompileInfo, callerMethodCompileInfo,
renamedLocalsMap,
variableReplacements,
argumentReplacements,
processedNodes,
newNodes
);
cfg.AddEdge(inlinedNode, newSuccessorNode, outEdge.BranchCondition);
}
return inlinedNode;
}