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Copy pathCodeGenVisitor.java
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CodeGenVisitor.java
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package cop5556sp17;
import java.io.PrintWriter;
import java.lang.reflect.Constructor;
import java.lang.reflect.InvocationTargetException;
import java.net.MalformedURLException;
import java.util.ArrayList;
import java.util.Hashtable;
import java.util.List;
import org.objectweb.asm.ClassReader;
import org.objectweb.asm.ClassWriter;
import org.objectweb.asm.FieldVisitor;
import org.objectweb.asm.Label;
import org.objectweb.asm.MethodVisitor;
import org.objectweb.asm.Opcodes;
import org.objectweb.asm.util.TraceClassVisitor;
import cop5556sp17.Scanner.Kind;
import cop5556sp17.Scanner.Token;
import cop5556sp17.TypeCheckVisitor.TypeCheckException;
import cop5556sp17.AST.ASTVisitor;
import cop5556sp17.AST.AssignmentStatement;
import cop5556sp17.AST.BinaryChain;
import cop5556sp17.AST.BinaryExpression;
import cop5556sp17.AST.Block;
import cop5556sp17.AST.BooleanLitExpression;
import cop5556sp17.AST.Chain;
import cop5556sp17.AST.ChainElem;
import cop5556sp17.AST.ConstantExpression;
import cop5556sp17.AST.Dec;
import cop5556sp17.AST.Expression;
import cop5556sp17.AST.FilterOpChain;
import cop5556sp17.AST.FrameOpChain;
import cop5556sp17.AST.IdentChain;
import cop5556sp17.AST.IdentExpression;
import cop5556sp17.AST.IdentLValue;
import cop5556sp17.AST.IfStatement;
import cop5556sp17.AST.ImageOpChain;
import cop5556sp17.AST.IntLitExpression;
import cop5556sp17.AST.ParamDec;
import cop5556sp17.AST.Program;
import cop5556sp17.AST.SleepStatement;
import cop5556sp17.AST.Statement;
import cop5556sp17.AST.Tuple;
import cop5556sp17.AST.Type.TypeName;
import cop5556sp17.AST.WhileStatement;
import static cop5556sp17.AST.Type.TypeName.BOOLEAN;
import static cop5556sp17.AST.Type.TypeName.FRAME;
import static cop5556sp17.AST.Type.TypeName.IMAGE;
import static cop5556sp17.AST.Type.TypeName.INTEGER;
import static cop5556sp17.AST.Type.TypeName.NONE;
import static cop5556sp17.AST.Type.TypeName.URL;
import static cop5556sp17.Scanner.Kind.*;
public class CodeGenVisitor implements ASTVisitor, Opcodes {
@SuppressWarnings("serial")
public static class CodeGenException extends Exception {
CodeGenException(String message) {
super(message);
}
}
private boolean predictSetMembershipTest(Token op, Kind... kinds) {
// test if the token is a member of the predict set
// CAREFUL. This method does not throw SyntaxException. It is up to the caller to check
for (Kind someKind : kinds) //iterate through list of kinds passed in
{
if (op.kind == someKind)
{
//System.out.println("predictSetMembershipTest -> " + t.kind);
return true; //found the token in some predict set
}
}
return false;
}
class methodVInnerScoper
{
MethodVisitor mv; int index;
methodVInnerScoper (MethodVisitor mv, int index)
{
this.mv = mv; this.index = index;
}
}
SymbolTable symtab; //keep track of nesting
Hashtable<String, Integer> slotTable; //slots assigned to local vars
/**
* @param DEVEL
* used as parameter to genPrint and genPrintTOS
* @param GRADE
* used as parameter to genPrint and genPrintTOS
* @param sourceFileName
* name of source file, may be null.
*/
public CodeGenVisitor(boolean DEVEL, boolean GRADE, String sourceFileName) {
super();
this.DEVEL = DEVEL;
this.GRADE = GRADE;
this.sourceFileName = sourceFileName;
symtab = new SymbolTable();
slotTable = new Hashtable<String, Integer>();
}
ClassWriter cw;
String className;
String classDesc;
String sourceFileName;
MethodVisitor mv; // visitor of method currently under construction
/** Indicates whether genPrint and genPrintTOS should generate code. */
final boolean DEVEL;
final boolean GRADE;
@Override
public Object visitProgram(Program program, Object arg) throws Exception {
cw = new ClassWriter(ClassWriter.COMPUTE_FRAMES);
className = program.getName();
classDesc = "L" + className + ";";
String sourceFileName = (String) arg;
cw.visit(52, ACC_PUBLIC + ACC_SUPER, className, null, "java/lang/Object",
new String[] { "java/lang/Runnable" });
cw.visitSource(sourceFileName, null);
ArrayList<ParamDec> params = program.getParams();
for (ParamDec dec : params)
{
dec.visit(this, mv); //Visit paramDec
symtab.insert(dec.getIdent().getText(), dec);
}
// generate constructor code
// get a MethodVisitor
mv = cw.visitMethod(ACC_PUBLIC, "<init>", "([Ljava/lang/String;)V", null,
null);
mv.visitCode();
// Create label at start of code
Label constructorStart = new Label();
mv.visitLabel(constructorStart);
// this is for convenience during development--you can see that the code
// is doing something.
CodeGenUtils.genPrint(DEVEL, mv, "\nentering <init>");
// generate code to call superclass constructor
mv.visitVarInsn(ALOAD, 0);
mv.visitMethodInsn(INVOKESPECIAL, "java/lang/Object", "<init>", "()V", false);
// visit parameter decs to add each as field to the class
// pass in mv so decs can add their initialization code to the
// constructor.
int count = 0; //assume args have the right size to match number of declared vars
for (ParamDec dec : params)
{
switch (dec.getTypeName())
{
case INTEGER:
//System.out.println(dec.getTypeName());
//System.out.println(dec.getIdent().getText());
mv.visitVarInsn(ALOAD, 0); //loads the address for the PUTFIELD instruction
mv.visitVarInsn(ALOAD, 1); //base address of args
mv.visitIntInsn(SIPUSH, count); //index of args
mv.visitInsn(AALOAD); //loads the index'th element
mv.visitMethodInsn(INVOKESTATIC, "java/lang/Integer", "parseInt", "(Ljava/lang/String;)I", false);
mv.visitFieldInsn(PUTFIELD, className, dec.getIdent().getText(), "I");
break;
case BOOLEAN:
//System.out.println(dec.getTypeName());
//System.out.println(dec.getIdent().getText());
mv.visitVarInsn(ALOAD, 0);
mv.visitVarInsn(ALOAD, 1);
mv.visitIntInsn(SIPUSH, count);
mv.visitInsn(AALOAD);
mv.visitMethodInsn(INVOKESTATIC, "java/lang/Boolean", "parseBoolean", "(Ljava/lang/String;)Z", false);
mv.visitFieldInsn(PUTFIELD, className, dec.getIdent().getText(), "Z");
break;
case FILE:
mv.visitVarInsn(ALOAD, 0);
mv.visitTypeInsn(NEW, TypeName.FILE.getJVMClass());
mv.visitInsn(DUP); //dupe reference
mv.visitVarInsn(ALOAD, 1);
mv.visitIntInsn(SIPUSH, count);
mv.visitInsn(AALOAD); //load args[count]
mv.visitMethodInsn(INVOKESPECIAL, TypeName.FILE.getJVMClass(), "<init>", "(Ljava/lang/String;)V", false);
mv.visitFieldInsn(PUTFIELD, className, dec.getIdent().getText(), TypeName.FILE.getJVMTypeDesc());
break;
case URL:
/*
mv.visitVarInsn(ALOAD, 0);
mv.visitTypeInsn(NEW, URL.getJVMClass());
mv.visitInsn(DUP); //dupe reference
mv.visitVarInsn(ALOAD, 1);
mv.visitIntInsn(SIPUSH, count);
mv.visitInsn(AALOAD); //load args[count]
mv.visitMethodInsn(INVOKESPECIAL, URL.getJVMClass(), "<init>", "(Ljava/lang/String;)V", false);
mv.visitFieldInsn(PUTFIELD, className, dec.getIdent().getText(), URL.getJVMTypeDesc());
*/
mv.visitVarInsn(ALOAD, 0);
mv.visitVarInsn(ALOAD, 1);
mv.visitIntInsn(SIPUSH, count);
mv.visitMethodInsn(INVOKESTATIC, "cop5556sp17/PLPRuntimeImageIO", "getURL", PLPRuntimeImageIO.getURLSig, false);
mv.visitFieldInsn(PUTFIELD, className, dec.getIdent().getText(), URL.getJVMTypeDesc());
break;
default:
{
throw new CodeGenException ("not yet implemented (constructor init)");
}
}
count++;
}
mv.visitInsn(RETURN);
// create label at end of code
Label constructorEnd = new Label();
mv.visitLabel(constructorEnd);
// finish up by visiting local vars of constructor
// the fourth and fifth arguments are the region of code where the local
// variable is defined as represented by the labels we inserted.
mv.visitLocalVariable("this", classDesc, null, constructorStart, constructorEnd, 0);
mv.visitLocalVariable("args", "[Ljava/lang/String;", null, constructorStart, constructorEnd, 1);
// indicates the max stack size for the method.
// because we used the COMPUTE_FRAMES parameter in the classwriter
// constructor, asm
// will do this for us. The parameters to visitMaxs don't matter, but
// the method must
// be called.
mv.visitMaxs(1, 1);
// finish up code generation for this method.
mv.visitEnd();
// end of constructor
// create main method which does the following
// 1. instantiate an instance of the class being generated, passing the
// String[] with command line arguments
// 2. invoke the run method.
mv = cw.visitMethod(ACC_PUBLIC + ACC_STATIC, "main", "([Ljava/lang/String;)V", null,
null);
mv.visitCode();
Label mainStart = new Label();
mv.visitLabel(mainStart);
// this is for convenience during development--you can see that the code
// is doing something.
CodeGenUtils.genPrint(DEVEL, mv, "\nentering main");
mv.visitTypeInsn(NEW, className);
mv.visitInsn(DUP);
mv.visitVarInsn(ALOAD, 0);
mv.visitMethodInsn(INVOKESPECIAL, className, "<init>", "([Ljava/lang/String;)V", false);
mv.visitMethodInsn(INVOKEVIRTUAL, className, "run", "()V", false);
mv.visitInsn(RETURN);
Label mainEnd = new Label();
mv.visitLabel(mainEnd);
mv.visitLocalVariable("args", "[Ljava/lang/String;", null, mainStart, mainEnd, 0);
mv.visitLocalVariable("instance", classDesc, null, mainStart, mainEnd, 1);
mv.visitMaxs(0, 0);
mv.visitEnd();
// create run method
mv = cw.visitMethod(ACC_PUBLIC, "run", "()V", null, null);
mv.visitCode();
Label startRun = new Label();
mv.visitLabel(startRun);
CodeGenUtils.genPrint(DEVEL, mv, "\nentering run");
program.getB().visit(this, new methodVInnerScoper(mv, 1)); //block is guaranteed to have the correct mv?
mv.visitInsn(RETURN);
Label endRun = new Label();
mv.visitLabel(endRun);
mv.visitLocalVariable("this", classDesc, null, startRun, endRun, 0);
//TODO visit the local variables
mv.visitMaxs(1, 1);
mv.visitEnd(); // end of run method
cw.visitEnd();//end of class
//generate classfile and return it
return cw.toByteArray();
}
@Override
public Object visitAssignmentStatement(AssignmentStatement assignStatement, Object arg) throws Exception {
assignStatement.getE().visit(this, arg); //push the expression value to stack first
CodeGenUtils.genPrint(DEVEL, mv, "\nassignment: " + assignStatement.var.getText() + "=");
CodeGenUtils.genPrintTOS(GRADE, mv, assignStatement.getE().getType());
//then, istore/putfield
assignStatement.getVar().visit(this, arg); //var is internally IDENT+INDEX
return null;
}
@Override
public Object visitBinaryChain(BinaryChain binaryChain, Object arg) throws Exception {
//assert false : "not yet implemented";
Chain e0 = binaryChain.getE0();
Token arrow = binaryChain.getArrow();
ChainElem e1 = binaryChain.getE1();
if (e0 instanceof IdentChain)
{
e0.visit(this, 'L');
}
else
{
e0.visit(this, arg);
}
if (e1 instanceof FilterOpChain)
{
if (arrow.isKind(BARARROW))
{
//System.out.println("BARROW");
e1.visit(this, 'B');
}
else
{
e1.visit(this, 'R');
}
}
else if (e1 instanceof IdentChain)
{
e1.visit(this, 'R');
}
else
{
e1.visit(this, arg);
}
/*
if (e0 instanceof BinaryChain && ((BinaryChain) e0).getE1() instanceof IdentChain)
{
((BinaryChain) e0).getE1().visit(this, 'L'); //if the right of e0 is identChain, we must load it
}
*/
//always push value on top of stack if you are the right end of binaryChain
Token instanceOf = e1.getFirstToken();
boolean isFilterOp = e1 instanceof FilterOpChain;
boolean isFrameOp = e1 instanceof FrameOpChain;
boolean isImageOp = e1 instanceof ImageOpChain;
return null;
}
@Override
public Object visitBinaryExpression(BinaryExpression binaryExpression, Object arg) throws Exception {
//TODO Implement this
methodVInnerScoper container = (methodVInnerScoper) arg;
MethodVisitor mv = container.mv;
int scopeIndex = container.index;
Expression e0 = binaryExpression.getE0();
Token op = binaryExpression.getOp();
Expression e1 = binaryExpression.getE1();
//System.out.println("visiting codegen binary op");
e0.visit(this, arg); e1.visit(this, arg);
//System.out.println(e0.getType() + " " + e1.getType());
if (e0.getType() == TypeName.INTEGER && e1.getType() == TypeName.INTEGER && (op.isKind(Kind.MOD))) //mod
{
mv.visitInsn(IREM);
}
else if (e0.getType() == TypeName.BOOLEAN && e1.getType() == TypeName.BOOLEAN && predictSetMembershipTest(op, Kind.OR, Kind.AND))
{
if (op.isKind(Kind.OR))
{
mv.visitInsn(IOR);
}
else
{
mv.visitInsn(IAND);
}
}
else if (e0.getType() == TypeName.INTEGER && e1.getType() == TypeName.INTEGER && (op.isKind(Kind.PLUS) || op.isKind(Kind.MINUS)))
{
//binaryExpression.setType(INTEGER);
if (op.isKind(Kind.PLUS))
{
mv.visitInsn(IADD);
}
else
{
mv.visitInsn(ISUB);
}
}
else if (e0.getType() == TypeName.IMAGE && e1.getType() == TypeName.IMAGE && (op.isKind(Kind.PLUS) || op.isKind(Kind.MINUS)))
{
//binaryExpression.setType(IMAGE);
if (op.isKind(Kind.PLUS))
{
mv.visitMethodInsn(INVOKESTATIC, "cop5556sp17/PLPRuntimeImageOps", "add", "(Ljava/awt/image/BufferedImage;Ljava/awt/image/BufferedImage;)Ljava/awt/image/BufferedImage;", false);
}
else
{
mv.visitMethodInsn(INVOKESTATIC, "cop5556sp17/PLPRuntimeImageOps", "sub", "(Ljava/awt/image/BufferedImage;Ljava/awt/image/BufferedImage;)Ljava/awt/image/BufferedImage;", false);
}
}
else if (e0.getType() == TypeName.INTEGER && e1.getType() == TypeName.INTEGER && (op.isKind(Kind.TIMES) || op.isKind(Kind.DIV)))
{
//binaryExpression.setType(INTEGER);
if (op.isKind(Kind.TIMES))
{
mv.visitInsn(IMUL);
}
else
{
mv.visitInsn(IDIV);
}
}
else if (e0.getType() == TypeName.INTEGER && e1.getType() == TypeName.INTEGER && predictSetMembershipTest(op, Kind.LT, Kind.GT, Kind.LE, Kind.GE))
{
//binaryExpression.setType(BOOLEAN);
//Kind.LT, Kind.GT, Kind.LE, Kind.GE
Label caseFalse = new Label();
Label caseTrue = new Label();
switch (op.kind)
{
case LT:
mv.visitJumpInsn(IF_ICMPGE, caseFalse);
mv.visitInsn(ICONST_1);
mv.visitJumpInsn(GOTO, caseTrue);
break;
case GT:
mv.visitJumpInsn(IF_ICMPLE, caseFalse);
mv.visitInsn(ICONST_1);
mv.visitJumpInsn(GOTO, caseTrue);
break;
case LE:
mv.visitJumpInsn(IF_ICMPGT, caseFalse);
mv.visitInsn(ICONST_1);
mv.visitJumpInsn(GOTO, caseTrue);
break;
case GE:
mv.visitJumpInsn(IF_ICMPLT, caseFalse);
mv.visitInsn(ICONST_1);
mv.visitJumpInsn(GOTO, caseTrue);
break;
default:
{
throw new CodeGenException("unsupported binary operation: " + binaryExpression);
}
}
mv.visitLabel(caseFalse);
mv.visitInsn(ICONST_0);
mv.visitLabel(caseTrue);
}
else if (e0.getType() == TypeName.BOOLEAN && e1.getType() == TypeName.BOOLEAN && predictSetMembershipTest(op, Kind.LT, Kind.GT, Kind.LE, Kind.GE))
{
//binaryExpression.setType(BOOLEAN);
Label caseFalse = new Label();
Label caseTrue = new Label();
switch (op.kind)
{
case LT:
mv.visitJumpInsn(IF_ICMPGE, caseFalse);
mv.visitInsn(ICONST_1);
mv.visitJumpInsn(GOTO, caseTrue);
break;
case GT:
mv.visitJumpInsn(IF_ICMPLE, caseFalse);
mv.visitInsn(ICONST_1);
mv.visitJumpInsn(GOTO, caseTrue);
break;
case LE:
mv.visitJumpInsn(IF_ICMPGT, caseFalse);
mv.visitInsn(ICONST_1);
mv.visitJumpInsn(GOTO, caseTrue);
break;
case GE:
mv.visitJumpInsn(IF_ICMPLT, caseFalse);
mv.visitInsn(ICONST_1);
mv.visitJumpInsn(GOTO, caseTrue);
break;
default:
{
throw new CodeGenException("unsupported binary operation: " + binaryExpression);
}
}
mv.visitLabel(caseFalse);
mv.visitInsn(ICONST_0);
mv.visitLabel(caseTrue);
}
else if (e0.getType() == TypeName.IMAGE && e1.getType() == TypeName.INTEGER && predictSetMembershipTest(op, Kind.TIMES))
{
//binaryExpression.setType(IMAGE);
mv.visitMethodInsn(INVOKESTATIC, "cop5556sp17/PLPRuntimeImageOps", "mul", "(Ljava/awt/image/BufferedImage;I)Ljava/awt/image/BufferedImage;", false);
}
else if (e0.getType() == TypeName.IMAGE && e1.getType() == TypeName.INTEGER && predictSetMembershipTest(op, Kind.DIV))
{
//binaryExpression.setType(IMAGE);
mv.visitMethodInsn(INVOKESTATIC, "cop5556sp17/PLPRuntimeImageOps", "div", "(Ljava/awt/image/BufferedImage;I)Ljava/awt/image/BufferedImage;", false);
}
else if (e0.getType() == TypeName.IMAGE && e1.getType() == TypeName.INTEGER && predictSetMembershipTest(op, Kind.MOD))
{
//binaryExpression.setType(IMAGE);
mv.visitMethodInsn(INVOKESTATIC, "cop5556sp17/PLPRuntimeImageOps", "mod", "(Ljava/awt/image/BufferedImage;I)Ljava/awt/image/BufferedImage;", false);
}
else if (e0.getType() == TypeName.INTEGER && e1.getType() == TypeName.IMAGE && predictSetMembershipTest(op, Kind.TIMES))
{
//binaryExpression.setType(IMAGE);
mv.visitInsn(SWAP);
mv.visitMethodInsn(INVOKESTATIC, "cop5556sp17/PLPRuntimeImageOps", "mul", "(Ljava/awt/image/BufferedImage;I)Ljava/awt/image/BufferedImage;", false);
}
else if (predictSetMembershipTest(op, Kind.NOTEQUAL, Kind.EQUAL))
{
if (e0.getType() != e1.getType())
{
throw new CodeGenException("mismatch of types using == or !=: " + binaryExpression);
}
else if (e0.getType() == TypeName.INTEGER || e0.getType() == TypeName.BOOLEAN)
{
//binaryExpression.setType(BOOLEAN);
Label caseFalse = new Label();
Label caseTrue = new Label();
if (op.isKind(Kind.NOTEQUAL))
{
mv.visitJumpInsn(IF_ICMPEQ, caseFalse);
mv.visitInsn(ICONST_1);
mv.visitJumpInsn(GOTO, caseTrue);
mv.visitLabel(caseFalse);
mv.visitInsn(ICONST_0);
mv.visitLabel(caseTrue);
}
else
{
mv.visitJumpInsn(IF_ICMPNE, caseFalse);
mv.visitInsn(ICONST_1);
mv.visitJumpInsn(GOTO, caseTrue);
mv.visitLabel(caseFalse);
mv.visitInsn(ICONST_0);
mv.visitLabel(caseTrue);
}
}
else
{
Label caseFalse = new Label();
Label caseTrue = new Label();
if (op.isKind(Kind.NOTEQUAL))
{
mv.visitJumpInsn(IF_ACMPEQ, caseFalse);
mv.visitInsn(ICONST_1);
mv.visitJumpInsn(GOTO, caseTrue);
mv.visitLabel(caseFalse);
mv.visitInsn(ICONST_0);
mv.visitLabel(caseTrue);
}
else
{
mv.visitJumpInsn(IF_ACMPNE, caseFalse);
mv.visitInsn(ICONST_1);
mv.visitJumpInsn(GOTO, caseTrue);
mv.visitLabel(caseFalse);
mv.visitInsn(ICONST_0);
mv.visitLabel(caseTrue);
}
}
}
else
{
throw new CodeGenException("illegal binaryExpression combination: " + binaryExpression);
}
return null;
}
@Override
public Object visitBlock(Block block, Object arg) throws Exception {
//TODO Implement this
symtab.enterScope();
//System.out.println("entering block codegen:");
methodVInnerScoper container = (methodVInnerScoper) arg;
MethodVisitor mv = container.mv;
int scopeIndex = container.index;
Label startBlock = new Label(); //starts a new scope
mv.visitLabel(startBlock); //which mv?
ArrayList<Dec> decList = block.getDecs();
ArrayList<Statement> statementList = block.getStatements();
int scopeIndexTemp = scopeIndex;
for (Dec i : decList) //for each item in decList
{
symtab.insert(i.getIdent().getText(), i);
//System.out.println("Inserting into slot table: " + ((i.getIdent().getText())+symtab.lookupScope(i.getIdent().getText())) + " @" + scopeIndexTemp);
slotTable.put(((i.getIdent().getText())+symtab.lookupScope(i.getIdent().getText())), scopeIndexTemp);
mv.visitInsn(ACONST_NULL);
mv.visitVarInsn(ASTORE, scopeIndexTemp);
scopeIndexTemp++;
} //remembers which slot goes to which local variable. Local variable name is combined with their scope level to form unique key
for (Statement i : statementList) //for each item in statementList
{
i.visit(this, new methodVInnerScoper(mv, scopeIndex + statementList.size()));
if (i instanceof BinaryChain || i instanceof IdentChain || i instanceof FilterOpChain || i instanceof ImageOpChain || i instanceof FrameOpChain)
{
mv.visitInsn(POP); //pop binarychain return value because it is not being assigned
}
}
Label endBlock = new Label();
mv.visitLabel(endBlock);
//visit all local vars
for (Dec i : decList) //for each item in decList
{
//visits each local var, at the end of all statements
switch(i.getTypeName())
{
case INTEGER:
//System.out.println(i.getIdent().getText() + " @ slot (visit localvar)" + scopeIndex);
mv.visitLocalVariable(i.getIdent().getText(), "I", null, startBlock, endBlock, scopeIndex);
break;
case BOOLEAN:
//System.out.println(i.getIdent().getText() + " @ slot (visit localvar)" + scopeIndex);
mv.visitLocalVariable(i.getIdent().getText(), "Z", null, startBlock, endBlock, scopeIndex);
break;
case IMAGE:
//the constructor haven't been called yet
mv.visitLocalVariable(i.getIdent().getText(), TypeName.IMAGE.getJVMTypeDesc(), null, startBlock, endBlock, scopeIndex);
break;
case FRAME:
//the constructor haven't been called yet
mv.visitLocalVariable(i.getIdent().getText(), "Lcop5556sp17/PLPRuntimeFrame;", null, startBlock, endBlock, scopeIndex);
break;
default:
{
throw new CodeGenException ("not yet implemented (visitBlock dec)");
}
}
scopeIndex++;
}
symtab.leaveScope();
return null;
}
@Override
public Object visitBooleanLitExpression(BooleanLitExpression booleanLitExpression, Object arg) throws Exception {
//TODO Implement this
//System.out.println("Pushed bool onto stack");
if (booleanLitExpression.getValue())
{
mv.visitInsn(ICONST_1);
}
else
{
mv.visitInsn(ICONST_0);
}
return null;
}
@Override
public Object visitConstantExpression(ConstantExpression constantExpression, Object arg) {
//assert false : "not yet implemented";
if (constantExpression.getFirstToken().isKind(KW_SCREENHEIGHT))
{
mv.visitMethodInsn(INVOKESTATIC, "cop5556sp17/PLPRuntimeFrame", "getScreenHeight", "()I", false);
}
else
{
mv.visitMethodInsn(INVOKESTATIC, "cop5556sp17/PLPRuntimeFrame", "getScreenWidth", "()I", false);
}
return null;
}
@Override
public Object visitDec(Dec declaration, Object arg) throws Exception {
//TODO Implement this
return null;
}
@Override
public Object visitFilterOpChain(FilterOpChain filterOpChain, Object arg) throws Exception {
//assert false : "not yet implemented";
Token token = filterOpChain.getFirstToken();
if ((char) arg == 'B') //barrow
{
//System.out.println("barrow ImageOpChain");
mv.visitInsn(DUP);
mv.visitMethodInsn(INVOKESTATIC, "cop5556sp17/PLPRuntimeImageOps", "copyImage", "(Ljava/awt/image/BufferedImage;)Ljava/awt/image/BufferedImage;", false);
mv.visitInsn(SWAP);
}
else
{
mv.visitInsn(ACONST_NULL);
}
if (token.isKind(Kind.OP_GRAY))
{
mv.visitMethodInsn(INVOKESTATIC, "cop5556sp17/PLPRuntimeFilterOps", "grayOp", "(Ljava/awt/image/BufferedImage;Ljava/awt/image/BufferedImage;)Ljava/awt/image/BufferedImage;", false);
}
else if (token.isKind(Kind.OP_BLUR))
{
mv.visitMethodInsn(INVOKESTATIC, "cop5556sp17/PLPRuntimeFilterOps", "blurOp", "(Ljava/awt/image/BufferedImage;Ljava/awt/image/BufferedImage;)Ljava/awt/image/BufferedImage;", false);
}
else //OP_CONVOLVE
{
mv.visitMethodInsn(INVOKESTATIC, "cop5556sp17/PLPRuntimeFilterOps", "convolveOp", "(Ljava/awt/image/BufferedImage;Ljava/awt/image/BufferedImage;)Ljava/awt/image/BufferedImage;", false);
}
return null;
}
@Override
public Object visitFrameOpChain(FrameOpChain frameOpChain, Object arg) throws Exception {
//assert false : "not yet implemented";
Token token = frameOpChain.getFirstToken();
Tuple tuple = frameOpChain.getArg();
if (token.isKind(Kind.KW_XLOC))
{
mv.visitMethodInsn(INVOKEVIRTUAL, PLPRuntimeFrame.JVMClassName, "getXVal", PLPRuntimeFrame.getXValDesc, false);
}
else if (token.isKind(Kind.KW_YLOC))
{
mv.visitMethodInsn(INVOKEVIRTUAL, PLPRuntimeFrame.JVMClassName, "getYVal", PLPRuntimeFrame.getYValDesc, false);
}
else if (token.isKind(Kind.KW_SHOW))
{
mv.visitMethodInsn(INVOKEVIRTUAL, PLPRuntimeFrame.JVMClassName, "showImage", PLPRuntimeFrame.showImageDesc, false);
}
else if (token.isKind(Kind.KW_HIDE))
{
mv.visitMethodInsn(INVOKEVIRTUAL, PLPRuntimeFrame.JVMClassName, "hideImage", PLPRuntimeFrame.hideImageDesc, false);
}
else //KW_MOVE
{
//frameVar.moveFrame(1,1)
tuple.visit(this, arg);
mv.visitMethodInsn(INVOKEVIRTUAL, PLPRuntimeFrame.JVMClassName, "moveFrame", PLPRuntimeFrame.moveFrameDesc, false);
}
return null;
}
@Override
public Object visitIdentChain(IdentChain identChain, Object arg) throws Exception {
//assert false : "not yet implemented";
Dec dec = identChain.dec;
int scope = identChain.scopeLevel; //get the scope of the variable
TypeName type = identChain.getType(); //type was set in TypeCheckVistor
scope = identChain.scopeLevel; //the newest scope getter
char loadOrStore = (char) arg;
if (loadOrStore == 'L') //puts stuff on stack
{
if (scope == 0)
{
switch (dec.getTypeName())
{
case INTEGER:
mv.visitVarInsn(ALOAD, 0);
mv.visitFieldInsn(GETFIELD, className, dec.getIdent().getText(), "I");
//System.out.println("->" + dec.getIdent().getText());
break;
case BOOLEAN:
mv.visitVarInsn(ALOAD, 0);
mv.visitFieldInsn(GETFIELD, className, dec.getIdent().getText(), "Z");
//System.out.println("->" + dec.getIdent().getText());
break;
case URL:
mv.visitVarInsn(ALOAD, 0);
mv.visitFieldInsn(GETFIELD, className, dec.getIdent().getText(), "Ljava/net/URL;");
mv.visitMethodInsn(INVOKESTATIC, "cop5556sp17/PLPRuntimeImageIO", "readFromURL", "(Ljava/net/URL;)Ljava/awt/image/BufferedImage;", false);
break;
case FILE:
mv.visitVarInsn(ALOAD, 0);
mv.visitFieldInsn(GETFIELD, className, dec.getIdent().getText(), "Ljava/io/File;");
mv.visitMethodInsn(INVOKESTATIC, "cop5556sp17/PLPRuntimeImageIO", "readFromFile", "(Ljava/io/File;)Ljava/awt/image/BufferedImage;", false);
break;
default:
{
throw new CodeGenException ("not yet implemented (visitIdentChain) " + dec.getTypeName());
}
}
}
else if (scope > 0)
{
//System.out.println("->" + (dec.getIdent().getText())); //v5 1 -> v51.
//Combine var name with scope level of var to get local variable slot
int slot = slotTable.get((dec.getIdent().getText())+scope);
//System.out.println("->slot:" + slot);
switch (dec.getTypeName())
{
case INTEGER:
mv.visitVarInsn(ILOAD, slot);
break;
case BOOLEAN:
mv.visitVarInsn(ILOAD, slot);
break;
case IMAGE:
mv.visitVarInsn(ALOAD, slot);
break;
case FRAME:
mv.visitVarInsn(ALOAD, slot);
break;
default:
{
throw new CodeGenException ("not yet implemented (visitIdentChain) " + dec.getTypeName());
}
}
}
else
{
throw new CodeGenException("Scope level of var is -1! " + dec);
}
}
else //'R', which means store it
{
if (scope == 0)
{
switch (dec.getTypeName())
{
case INTEGER:
mv.visitInsn(DUP);
mv.visitVarInsn(ALOAD, 0);
mv.visitInsn(SWAP); //swap exression return and addr
mv.visitFieldInsn(PUTFIELD, className, dec.getIdent().getText(), "I");
//System.out.println("->" + identX.getText());
break;
case BOOLEAN:
mv.visitInsn(DUP);
mv.visitVarInsn(ALOAD, 0);
mv.visitInsn(SWAP); //swap exression return and addr
mv.visitFieldInsn(PUTFIELD, className, dec.getIdent().getText(), "Z");
//System.out.println("->" + identX.getText());
break;
case FILE:
//mv.visitVarInsn(ALOAD, 1); //the BufferedImage should be already on stack
mv.visitVarInsn(ALOAD, 0);
mv.visitFieldInsn(GETFIELD, className, dec.getIdent().getText(), "Ljava/io/File;");
mv.visitMethodInsn(INVOKESTATIC, "cop5556sp17/PLPRuntimeImageIO", "write", "(Ljava/awt/image/BufferedImage;Ljava/io/File;)Ljava/awt/image/BufferedImage;", false);
//mv.visitInsn(DUP); //the function call already puts BufferedImage on stack
break;
//case URL: break; //URL should not appear on the right side of binary chain
default:
{
throw new CodeGenException ("not yet implemented (visitIdentChain) " + dec.getTypeName());
}
}
}
else if (scope > 0)
{
//System.out.println("->" + (identX.getText())); //v5 1 -> v51.
//Combine var name with scope level of var to get local variable slot
int slot = slotTable.get((dec.getIdent().getText())+scope);
//System.out.println("->slot:" + slot);
switch (dec.getTypeName())
{
case INTEGER:
//System.out.println("IdentChain r.h.s INT");
mv.visitInsn(DUP);
mv.visitVarInsn(ISTORE, slot);
break;
case BOOLEAN:
mv.visitInsn(DUP);
mv.visitVarInsn(ISTORE, slot);
break;
case IMAGE:
/*
mv.visitVarInsn(ALOAD, 2);
mv.visitMethodInsn(INVOKESTATIC, "cop5556sp17/PLPRuntimeImageOps", "copyImage", "(Ljava/awt/image/BufferedImage;)Ljava/awt/image/BufferedImage;", false);
mv.visitVarInsn(ASTORE, 1);
*/
//store the image in var. assumes BufferedImage is on stack
//IMAGE->instanceof IdentChain
//not image,frame, or file,
//mv.visitMethodInsn(INVOKESTATIC, "cop5556sp17/PLPRuntimeImageOps", "copyImage", "(Ljava/awt/image/BufferedImage;)Ljava/awt/image/BufferedImage;", false);
mv.visitInsn(DUP);
/*
if (identChain.haveBeenInit == false)
{
mv.visitInsn(ACONST_NULL);
mv.visitVarInsn(ASTORE, slot);
identChain.haveBeenInit = true;
}
*/
mv.visitVarInsn(ASTORE, slot);
//System.out.println("image r.h.s of IdentChain");
break;
case FRAME:
//mv.visitVarInsn(ALOAD, 1); //the image, which should already be on stack
/*
if (identChain.haveBeenInit == false)
{
mv.visitInsn(ACONST_NULL);
mv.visitVarInsn(ASTORE, slot);
identChain.haveBeenInit = true;
}
*/
mv.visitVarInsn(ALOAD, slot);
mv.visitMethodInsn(INVOKESTATIC, "cop5556sp17/PLPRuntimeFrame", "createOrSetFrame", "(Ljava/awt/image/BufferedImage;Lcop5556sp17/PLPRuntimeFrame;)Lcop5556sp17/PLPRuntimeFrame;", false);
mv.visitInsn(DUP);
mv.visitVarInsn(ASTORE, slot);
break;
default:
{
//mv.visitMethodInsn(INVOKESTATIC, "cop5556sp17/PLPRuntimeImageOps", "copyImage", "(Ljava/awt/image/BufferedImage;)Ljava/awt/image/BufferedImage;", false);
//mv.visitInsn(DUP);
//mv.visitVarInsn(ASTORE, slot);
//System.out.println("instanceof IdentChain");
throw new CodeGenException ("not yet implemented (visitIdentChain) " + dec.getTypeName());
}
}
}
else
{
throw new CodeGenException("Scope level of var is -1! " + dec);
}
}
return null;
}
@Override
public Object visitIdentExpression(IdentExpression identExpression, Object arg) throws Exception {
//TODO Implement this
Dec dec = identExpression.dec;
int scope = identExpression.scopeLevel; //get the scope of the variable
methodVInnerScoper container = (methodVInnerScoper) arg;
MethodVisitor mv = container.mv;
int scopeIndex = container.index;
scope = identExpression.scopeLevel; //the newest scope getter
//System.out.println("CGV Ident Expression:" + identExpression.getFirstToken().getText() + " " + scope);
//System.out.println(dec.getIdent().getText()+ " Scope:" + scope);
if (scope == 0)
{
switch (dec.getTypeName())
{
case INTEGER:
mv.visitVarInsn(ALOAD, 0);
mv.visitFieldInsn(GETFIELD, className, dec.getIdent().getText(), "I");
//System.out.println("->" + dec.getIdent().getText());
break;
case BOOLEAN:
mv.visitVarInsn(ALOAD, 0);
mv.visitFieldInsn(GETFIELD, className, dec.getIdent().getText(), "Z");
//System.out.println("->" + dec.getIdent().getText());
break;
case URL:
mv.visitVarInsn(ALOAD, 0);
mv.visitFieldInsn(GETFIELD, className, dec.getIdent().getText(), TypeName.URL.getJVMTypeDesc());
break;
case FILE:
mv.visitVarInsn(ALOAD, 0);
mv.visitFieldInsn(GETFIELD, className, dec.getIdent().getText(), TypeName.FILE.getJVMTypeDesc());
break;
default:
{
throw new CodeGenException ("not yet implemented (visitIdentExpression)");
}
}
}
else if (scope > 0)
{
//System.out.println("->" + (dec.getIdent().getText())); //v5 1 -> v51.
//Combine var name with scope level of var to get local variable slot
int slot = slotTable.get((dec.getIdent().getText())+scope);
//System.out.println("->slot:" + slot);
switch (dec.getTypeName())
{
case INTEGER:
mv.visitVarInsn(ILOAD, slot);
break;
case BOOLEAN:
mv.visitVarInsn(ILOAD, slot);
break;
case IMAGE:
mv.visitVarInsn(ALOAD, slot);
break;
case FRAME:
mv.visitVarInsn(ALOAD, slot);
break;