import java.util.Vector;
/**
- * Descriptor
+ * Descriptor
*
* represents a symbol in the language (var name, function name, etc).
*/
public class MethodDescriptor extends Descriptor {
- protected Modifiers modifier;
- protected TypeDescriptor returntype;
- protected String identifier;
- protected Vector params;
- protected SymbolTable paramtable;
- protected ClassDescriptor cd;
- protected VarDescriptor thisvd;
-
-
- public MethodDescriptor(Modifiers m, TypeDescriptor rt, String identifier) {
- super(identifier);
- this.modifier=m;
- this.returntype=rt;
- this.identifier=identifier;
- this.safename = "__" + name + "__";
- this.uniqueid=count++;
- params=new Vector();
- paramtable=new SymbolTable();
- thisvd=null;
- }
-
- public MethodDescriptor(Modifiers m, String identifier) {
- super(identifier);
- this.modifier=m;
- this.returntype=null;
- this.identifier=identifier;
- this.safename = "__" + name + "__";
- this.uniqueid=count++;
- params=new Vector();
- paramtable=new SymbolTable();
- thisvd=null;
- }
-
- public void setThis(VarDescriptor vd) {
- thisvd=vd;
- paramtable.add(vd);
- }
-
- public VarDescriptor getThis() {
- return thisvd;
- }
-
- public String getSafeMethodDescriptor() {
- String st="";
- for(int i=0;i<numParameters();i++) {
- st+=getParamType(i).getSafeDescriptor();
- if ((i+1)<numParameters())
- st+="_";
- }
- return st;
- }
-
- public boolean isStatic() {
- return modifier.isStatic();
- }
-
- public boolean isConstructor() {
- return (returntype==null);
- }
-
- public TypeDescriptor getReturnType() {
- return returntype;
- }
-
- public void setClassDesc(ClassDescriptor cd) {
- this.cd=cd;
- }
-
- public ClassDescriptor getClassDesc() {
- return cd;
- }
-
- public SymbolTable getParameterTable() {
- return paramtable;
- }
-
- public void addParameter(TypeDescriptor type, String paramname) {
- if (paramname.equals("this"))
- throw new Error("Can't have parameter named this");
- VarDescriptor vd=new VarDescriptor(type, paramname);
-
- params.add(vd);
- if (paramtable.getFromSameScope(paramname)!=null) {
- throw new Error("Parameter "+paramname+" already defined");
- }
- paramtable.add(vd);
- }
-
- public int numParameters() {
- return params.size();
- }
-
- public VarDescriptor getParameter(int i) {
- return (VarDescriptor)params.get(i);
- }
-
- public String getParamName(int i) {
- return ((VarDescriptor)params.get(i)).getName();
- }
-
- public TypeDescriptor getParamType(int i) {
- return ((VarDescriptor)params.get(i)).getType();
- }
-
- public String toString() {
- String st="";
- if (returntype!=null)
- st=modifier.toString()+returntype.toString()+" "+identifier+"(";
- else
- st=modifier.toString()+" "+identifier+"(";
- for(int i=0;i<params.size();i++) {
- st+=getParamType(i)+" "+getParamName(i);
- if ((i+1)!=params.size())
- st+=", ";
- }
- st+=")";
- return st;
- }
+ protected Modifiers modifier;
+ protected TypeDescriptor returntype;
+ protected String identifier;
+ protected Vector params;
+ protected SymbolTable paramtable;
+ protected ClassDescriptor cd;
+ protected VarDescriptor thisvd;
+ protected boolean isglobal;
+ protected boolean isstaticblock; // flag to indicate if this is a static block
+ protected boolean isinvokedbystatic; // flag to indicate if this method is invoked by some static block
+
+ protected boolean isdefaultconstructor; // flag to indicate if this is a default constructor
+
+ public MethodDescriptor(Modifiers m, TypeDescriptor rt, String identifier) {
+ super(identifier);
+ this.modifier=m;
+ this.returntype=rt;
+ this.identifier=identifier;
+ this.safename = "___" + name + "___";
+ this.uniqueid=count++;
+ params=new Vector();
+ paramtable=new SymbolTable();
+ thisvd=null;
+ isstaticblock = false;
+ this.isinvokedbystatic = false;
+ this.isdefaultconstructor = false;
+ }
+
+ public Modifiers getModifiers() {
+ return modifier;
+ }
+
+ public boolean matches(MethodDescriptor md) {
+ /* Check the name */
+ if (!identifier.equals(md.identifier))
+ return false;
+ if (numParameters()!=md.numParameters())
+ return false;
+ for(int i=0; i<numParameters(); i++) {
+ Descriptor d1=getParameter(i);
+ Descriptor d2=md.getParameter(i);
+ TypeDescriptor td1=(d1 instanceof TagVarDescriptor)?((TagVarDescriptor)d1).getType():((VarDescriptor)d1).getType();
+ TypeDescriptor td2=(d2 instanceof TagVarDescriptor)?((TagVarDescriptor)d2).getType():((VarDescriptor)d2).getType();
+ if (!td1.equals(td2))
+ return false;
+ }
+ return true;
+ }
+
+ public MethodDescriptor(Modifiers m, String identifier) {
+ this(m, identifier, false);
+ }
+
+ public MethodDescriptor(Modifiers m, String identifier, boolean isglobal) {
+ super(identifier);
+ this.isglobal=isglobal;
+ this.modifier=m;
+ this.returntype=null;
+ this.identifier=identifier;
+ this.safename = "___" + name + "___";
+ this.uniqueid=count++;
+ params=new Vector();
+ paramtable=new SymbolTable();
+ thisvd=null;
+ isstaticblock = false;
+ }
+
+
+ public boolean isGlobal() {
+ return isglobal;
+ }
+
+ public boolean isStaticBlock() {
+ return isstaticblock;
+ }
+
+ public void setAsStaticBlock() {
+ isstaticblock = true;
+ }
+
+ public boolean isInvokedByStatic() {
+ return this.isinvokedbystatic;
+ }
+
+ public void setIsInvokedByStatic(boolean isinvokedbystatic) {
+ this.isinvokedbystatic = isinvokedbystatic;
+ }
+
+ public void setThis(VarDescriptor vd) {
+ thisvd=vd;
+ paramtable.add(vd);
+ }
+
+ public VarDescriptor getThis() {
+ return thisvd;
+ }
+
+ public String getClassMethodName() {
+ return cd+"."+name;
+ }
+
+ public String getSafeMethodDescriptor() {
+ String st="";
+ for(int i=0; i<numParameters(); i++) {
+ st+=getParamType(i).getSafeDescriptor();
+ if ((i+1)<numParameters())
+ st+="_";
+ }
+ return st;
+ }
+
+ public boolean isStatic() {
+ return modifier.isStatic();
+ }
+
+ public boolean isAbstract() {
+ return modifier.isAbstract();
+ }
+
+ public boolean isConstructor() {
+ return (returntype==null) && !isstaticblock;
+ }
+
+ public TypeDescriptor getReturnType() {
+ return returntype;
+ }
+
+ public void setClassDesc(ClassDescriptor cd) {
+ this.cd=cd;
+ }
+
+ public ClassDescriptor getClassDesc() {
+ return cd;
+ }
+
+ public SymbolTable getParameterTable() {
+ return paramtable;
+ }
+
+ public void addParameter(TypeDescriptor type, String paramname) {
+ if (paramname.equals("this"))
+ throw new Error("Can't have parameter named this");
+ VarDescriptor vd=new VarDescriptor(type, paramname);
+
+ params.add(vd);
+ if (paramtable.getFromSameScope(paramname)!=null) {
+ throw new Error("Parameter "+paramname+" already defined");
+ }
+ paramtable.add(vd);
+ }
+
+ public void addTagParameter(TypeDescriptor type, String paramname) {
+ if (paramname.equals("this"))
+ throw new Error("Can't have parameter named this");
+ TagVarDescriptor vd=new TagVarDescriptor(null, paramname);
+
+ params.add(vd);
+ if (paramtable.getFromSameScope(paramname)!=null) {
+ throw new Error("Parameter "+paramname+" already defined");
+ }
+ paramtable.add(vd);
+ }
+
+ public int numParameters() {
+ return params.size();
+ }
+
+ public Descriptor getParameter(int i) {
+ return (Descriptor) params.get(i);
+ }
+
+ public String getParamName(int i) {
+ return ((Descriptor)params.get(i)).getSymbol();
+ }
+
+ public TypeDescriptor getParamType(int i) {
+ Descriptor d=(Descriptor)params.get(i);
+ if (d instanceof VarDescriptor)
+ return ((VarDescriptor)params.get(i)).getType();
+ else if (d instanceof TagVarDescriptor)
+ return new TypeDescriptor(TypeDescriptor.TAG);
+ else throw new Error();
+ }
+
+ public String getSafeSymbol() {
+ return safename.replace(".","___________");
+ }
+
+ public String toString() {
+ String st="";
+ String type="";
+ if (cd!=null)
+ type=cd+".";
+ if (returntype!=null)
+ st=modifier.toString()+returntype.toString()+" "+type+identifier+"(";
+ else
+ st=modifier.toString()+" "+type+identifier+"(";
+ for(int i=0; i<params.size(); i++) {
+ st+=getParamType(i)+" "+getParamName(i);
+ if ((i+1)!=params.size())
+ st+=", ";
+ }
+ st+=")";
+ return st;
+ }
+
+ public boolean isDefaultConstructor() {
+ return this.isdefaultconstructor;
+ }
+
+ public void setDefaultConstructor() {
+ this.isdefaultconstructor = true;
+ }
}
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