com.adamcornett.cminus.tree
Class FuncTree

java.lang.Object
  org.antlr.runtime.tree.BaseTree
      org.antlr.runtime.tree.CommonTree
          com.adamcornett.cminus.tree.CMTree
              com.adamcornett.cminus.tree.ExprNode
                  com.adamcornett.cminus.tree.FuncTree

All Implemented Interfaces:

FunctionNode, ScopeNode, TypeNode, org.antlr.runtime.tree.Tree

public class FuncTree
extends ExprNode
implements FunctionNode

A tree node representing a function.

Author:

Adam Cornett

Field Summary

private Function	f The function from the FunctionTable
private int	localVarCount The number of local variables to reserve space for.
private Scope	s The scope for this function from the scope table
private int	stackSize The amount of stack space to reserve

Fields inherited from class com.adamcornett.cminus.tree.CMTree

log

Fields inherited from class org.antlr.runtime.tree.CommonTree

childIndex, parent, startIndex, stopIndex, token

Fields inherited from class org.antlr.runtime.tree.BaseTree

children

Fields inherited from interface org.antlr.runtime.tree.Tree

INVALID_NODE

Constructor Summary

FuncTree(org.antlr.runtime.Token payload)

Method Summary

String	computeParamStr()
private String	computeParamStr(CMTree paramList) Helper function to generate the parameter list based on the Param List node
void	emitCode(ClassGenerator classGenerator) Emit the function declaration code, followed by the body of the function
private void	findFunction() Look up the function in the table based on its name.
protected CSTree	getCSTree() Get the compound statement node for this function
Function	getFunction() Get the function declaration from the FunctionTable
private CMTree	getParamList()
Type	getReturnType() Get the return type of the function
Scope	getScope() Get the function's scope
int	getScopeNumber() Get the function's scope number
private int	getVarDecs(CMTree root)
void	setFunction(Function f)
private void	setLocals() Calculate the number of local variables
void	setReturnType(Type t)
void	setScope(Scope s)
private void	setStackSize() Determine the stack size recursively by looking at all child statements and finding the one with the largest stack.

Methods inherited from class com.adamcornett.cminus.tree.ExprNode

getOperandType

Methods inherited from class com.adamcornett.cminus.tree.CMTree

emitLineInfo, getMaxTreeDepth, getNextLabelNumber, getRequiredStack

Methods inherited from class org.antlr.runtime.tree.CommonTree

dupNode, getCharPositionInLine, getChildIndex, getLine, getParent, getText, getToken, getTokenStartIndex, getTokenStopIndex, getType, isNil, setChildIndex, setParent, setTokenStartIndex, setTokenStopIndex, setUnknownTokenBoundaries, toString

Methods inherited from class org.antlr.runtime.tree.BaseTree

addChild, addChildren, createChildrenList, deleteChild, freshenParentAndChildIndexes, freshenParentAndChildIndexes, getAncestor, getAncestors, getChild, getChildCount, getChildren, getFirstChildWithType, hasAncestor, replaceChildren, sanityCheckParentAndChildIndexes, sanityCheckParentAndChildIndexes, setChild, toStringTree

Methods inherited from class java.lang.Object

clone, equals, finalize, getClass, hashCode, notify, notifyAll, wait, wait, wait

Field Detail

f

private Function f

The function from the FunctionTable

localVarCount

private int localVarCount

The number of local variables to reserve space for.

s

private Scope s

The scope for this function from the scope table

stackSize

private int stackSize

The amount of stack space to reserve

Constructor Detail

FuncTree

public FuncTree(org.antlr.runtime.Token payload)

Method Detail

computeParamStr

public String computeParamStr()

emitCode

public void emitCode(ClassGenerator classGenerator)

Emit the function declaration code, followed by the body of the function

Overrides:

emitCode in class CMTree

getFunction

public Function getFunction()

Get the function declaration from the FunctionTable

Specified by:

getFunction in interface FunctionNode

getReturnType

public Type getReturnType()

Get the return type of the function

Specified by:

getReturnType in interface TypeNode

Returns:

The return type of the function

See Also:

Function.getReturnType()

getScope

public Scope getScope()

Get the function's scope

Specified by:

getScope in interface ScopeNode

Returns:

the function's associated scope

getScopeNumber

public int getScopeNumber()

Get the function's scope number

Specified by:

getScopeNumber in interface ScopeNode

setFunction

public void setFunction(Function f)

Specified by:

setFunction in interface FunctionNode

setReturnType

public void setReturnType(Type t)

Specified by:

setReturnType in interface TypeNode

setScope

public void setScope(Scope s)

Specified by:

setScope in interface ScopeNode

computeParamStr

private String computeParamStr(CMTree paramList)

Helper function to generate the parameter list based on the Param List node

Parameters:

paramList - The Param List node for this function

Returns:

A string to be emitted in the function definition

findFunction

private void findFunction()

Look up the function in the table based on its name.

getParamList

private CMTree getParamList()

getVarDecs

private int getVarDecs(CMTree root)

setLocals

private void setLocals()

Calculate the number of local variables

setStackSize

private void setStackSize()

Determine the stack size recursively by looking at all child statements and finding the one with the largest stack.

getCSTree

protected CSTree getCSTree()

Get the compound statement node for this function

Returns: