Dmitry Jemerov
511 lines
18 KiB
Java
511 lines
18 KiB
Java
package org.jetbrains.jet.codegen;
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import com.intellij.psi.*;
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import org.jetbrains.jet.lang.psi.*;
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import org.jetbrains.jet.lang.resolve.BindingContext;
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import org.jetbrains.jet.lang.types.*;
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import org.jetbrains.jet.lexer.JetTokens;
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import org.objectweb.asm.Label;
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import org.objectweb.asm.MethodVisitor;
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import org.objectweb.asm.Opcodes;
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import org.objectweb.asm.Type;
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import org.objectweb.asm.commons.InstructionAdapter;
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import java.util.List;
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import java.util.Stack;
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/**
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* @author max
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*/
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public class ExpressionCodegen extends JetVisitor {
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private final Stack<Label> myLoopStarts = new Stack<Label>();
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private final Stack<Label> myLoopEnds = new Stack<Label>();
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private final Stack<StackValue> myStack = new Stack<StackValue>();
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private final InstructionAdapter v;
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private final JetStandardLibrary stdlib;
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private final FrameMap myMap;
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private final JetTypeMapper typeMapper;
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private final Type returnType;
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private final BindingContext bindingContext;
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public ExpressionCodegen(MethodVisitor v, BindingContext bindingContext, JetStandardLibrary stdlib, FrameMap myMap,
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JetTypeMapper typeMapper, Type returnType) {
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this.stdlib = stdlib;
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this.myMap = myMap;
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this.typeMapper = typeMapper;
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this.returnType = returnType;
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this.v = new InstructionAdapter(v);
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this.bindingContext = bindingContext;
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}
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private void gen(JetElement expr) {
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if (expr == null) throw new CompilationException();
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expr.accept(this);
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}
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private void gen(JetElement expr, Type type) {
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int oldStackDepth = myStack.size();
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gen(expr);
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if (myStack.size() == oldStackDepth+1) {
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StackValue value = myStack.pop();
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value.put(type, v);
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}
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}
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@Override
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public void visitExpression(JetExpression expression) {
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throw new UnsupportedOperationException("Codegen for " + expression + " is not yet implemented");
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}
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@Override
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public void visitParenthesizedExpression(JetParenthesizedExpression expression) {
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gen(expression.getExpression());
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}
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@Override
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public void visitAnnotatedExpression(JetAnnotatedExpression expression) {
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gen(expression.getBaseExpression());
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}
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@Override
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public void visitIfExpression(JetIfExpression expression) {
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JetType expressionType = bindingContext.getExpressionType(expression);
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Type asmType = typeMapper.mapType(expressionType);
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gen(expression.getCondition(), Type.BOOLEAN_TYPE);
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JetExpression thenExpression = expression.getThen();
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JetExpression elseExpression = expression.getElse();
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if (thenExpression == null && elseExpression == null) {
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throw new CompilationException();
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}
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if (thenExpression == null) {
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generateSingleBranchIf(elseExpression, false);
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return;
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}
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if (elseExpression == null) {
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generateSingleBranchIf(thenExpression, true);
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return;
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}
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Label elseLabel = new Label();
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v.ifeq(elseLabel); // == 0, i.e. false
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gen(thenExpression, asmType);
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Label endLabel = new Label();
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v.goTo(endLabel);
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v.mark(elseLabel);
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gen(elseExpression, asmType);
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v.mark(endLabel);
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}
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@Override
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public void visitWhileExpression(JetWhileExpression expression) {
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Label condition = new Label();
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myLoopStarts.push(condition);
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v.mark(condition);
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Label end = new Label();
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myLoopEnds.push(end);
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gen(expression.getCondition());
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unboxBoolean();
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v.ifeq(end);
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genToUnit(expression.getBody());
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v.goTo(condition);
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v.mark(end);
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myLoopEnds.pop();
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myLoopStarts.pop();
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}
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@Override
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public void visitDoWhileExpression(JetDoWhileExpression expression) {
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Label condition = new Label();
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v.mark(condition);
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myLoopStarts.push(condition);
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Label end = new Label();
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myLoopEnds.push(end);
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genToUnit(expression.getBody());
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gen(expression.getCondition());
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unboxBoolean();
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v.ifne(condition);
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v.mark(end);
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myLoopEnds.pop();
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myLoopStarts.pop();
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}
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@Override
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public void visitBreakExpression(JetBreakExpression expression) {
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JetSimpleNameExpression labelElement = expression.getTargetLabel();
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Label label = labelElement == null ? myLoopEnds.peek() : null; // TODO:
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v.goTo(label);
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}
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@Override
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public void visitContinueExpression(JetContinueExpression expression) {
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String labelName = expression.getLabelName();
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Label label = labelName == null ? myLoopStarts.peek() : null; // TODO:
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v.goTo(label);
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}
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private void unboxBoolean() {
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v.invokevirtual("java/lang/Boolean", "booleanValue", "()Z");
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}
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private void generateSingleBranchIf(JetExpression expression, boolean inverse) {
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Label endLabel = new Label();
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if (inverse) {
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v.ifeq(endLabel);
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}
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else {
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v.ifne(endLabel);
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}
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genToUnit(expression);
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v.mark(endLabel);
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}
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private void genToUnit(JetExpression expression) {
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gen(expression);
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if (!isUnitType(expression)) {
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v.pop();
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}
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}
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@Override
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public void visitConstantExpression(JetConstantExpression expression) {
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myStack.push(StackValue.constant(expression.getValue()));
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/*
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Object value = element.getValue();
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v.aconst(value);
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if (value instanceof Integer) {
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v.invokestatic("java/lang/Integer", "valueOf", "(I)Ljava/lang/Integer;");
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}
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else if (value instanceof Boolean) {
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v.invokestatic("java/lang/Boolean", "valueOf", "(Z)Ljava/lang/Boolean;");
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}
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else if (value instanceof Character) {
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v.invokestatic("java/lang/Character", "valueOf", "(C)Ljava/lang/Character;");
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}
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else if (value instanceof Short) {
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v.invokestatic("java/lang/Short", "valueOf", "(S)Ljava/lang/Short;");
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}
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else if (value instanceof Long) {
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v.invokestatic("java/lang/Long", "valueOf", "(J)Ljava/lang/Long;");
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}
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else if (value instanceof Byte) {
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v.invokestatic("java/lang/Byte", "valueOf", "(B)Ljava/lang/Byte;");
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}
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else if (value instanceof Float) {
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v.invokestatic("java/lang/Float", "valueOf", "(F)Ljava/lang/Float;");
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}
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else if (value instanceof Double) {
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v.invokestatic("java/lang/Double", "valueOf", "(D)Ljava/lang/Double;");
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}
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*/
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}
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@Override
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public void visitBlockExpression(JetBlockExpression expression) {
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Label blockStart = new Label();
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v.mark(blockStart);
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List<JetElement> statements = expression.getStatements();
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for (JetElement statement : statements) {
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if (statement instanceof JetProperty) {
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myMap.enter(bindingContext.getPropertyDescriptor((JetProperty) statement));
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}
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}
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for (JetElement statement : statements) {
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gen(statement);
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}
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Label blockEnd = new Label();
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v.mark(blockEnd);
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for (JetElement statement : statements) {
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if (statement instanceof JetProperty) {
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JetProperty var = (JetProperty) statement;
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PropertyDescriptor propertyDescriptor = bindingContext.getPropertyDescriptor(var);
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Type outType = typeMapper.mapType(propertyDescriptor.getOutType());
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int index = myMap.leave(propertyDescriptor);
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v.visitLocalVariable(var.getName(), outType.getDescriptor(), null, blockStart, blockEnd, index);
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}
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}
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}
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@Override
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public void visitReturnExpression(JetReturnExpression expression) {
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final JetExpression returnedExpression = expression.getReturnedExpression();
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if (returnedExpression != null) {
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gen(returnedExpression, returnType);
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v.areturn(returnType);
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}
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else {
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v.visitInsn(Opcodes.RETURN);
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}
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}
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public void returnTopOfStack() {
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if (myStack.size() > 0) {
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StackValue value = myStack.pop();
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value.put(returnType, v);
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v.areturn(returnType);
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}
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}
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@Override
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public void visitSimpleNameExpression(JetSimpleNameExpression expression) {
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final DeclarationDescriptor descriptor = bindingContext.resolveReferenceExpression(expression);
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PsiElement declaration = bindingContext.getDeclarationPsiElement(descriptor);
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if (declaration instanceof PsiField) {
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PsiField psiField = (PsiField) declaration;
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if (psiField.hasModifierProperty(PsiModifier.STATIC)) {
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v.visitFieldInsn(Opcodes.GETSTATIC,
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jvmName(psiField.getContainingClass()),
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psiField.getName(),
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psiTypeToAsm(psiField.getType()).getDescriptor());
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}
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else {
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throw new UnsupportedOperationException("don't know how to generate field reference " + descriptor);
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}
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}
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else {
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int index = myMap.getIndex(descriptor);
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if (index >= 0) {
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myStack.push(StackValue.local(index, ((PropertyDescriptor) descriptor).getOutType()));
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}
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else {
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throw new UnsupportedOperationException("don't know how to generate reference " + descriptor);
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}
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}
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}
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@Override
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public void visitCallExpression(JetCallExpression expression) {
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JetExpression callee = expression.getCalleeExpression();
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if (callee instanceof JetSimpleNameExpression) {
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DeclarationDescriptor funDescriptor = bindingContext.resolveReferenceExpression((JetSimpleNameExpression) callee);
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if (funDescriptor instanceof FunctionDescriptor) {
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PsiElement declarationPsiElement = bindingContext.getDeclarationPsiElement(funDescriptor);
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if (declarationPsiElement instanceof PsiMethod) {
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PsiMethod method = (PsiMethod) declarationPsiElement;
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PsiParameter[] parameters = method.getParameterList().getParameters();
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List<JetArgument> args = expression.getValueArguments();
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for (int i = 0, argsSize = args.size(); i < argsSize; i++) {
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JetArgument arg = args.get(i);
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gen(arg.getArgumentExpression(), psiTypeToAsm(parameters [i].getType()));
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}
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if (method.hasModifierProperty(PsiModifier.STATIC)) {
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v.visitMethodInsn(Opcodes.INVOKESTATIC,
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jvmName(method.getContainingClass()),
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method.getName(),
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getMethodDescriptor(method));
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}
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else {
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v.visitMethodInsn(Opcodes.INVOKEVIRTUAL,
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jvmName(method.getContainingClass()),
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method.getName(),
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getMethodDescriptor(method));
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}
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myStack.push(StackValue.onStack(psiTypeToAsm(method.getReturnType())));
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}
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}
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else {
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throw new CompilationException();
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}
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}
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else {
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throw new UnsupportedOperationException("Don't know how to generate a call");
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}
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}
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private static String jvmName(PsiClass containingClass) {
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return containingClass.getQualifiedName().replace(".", "/");
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}
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private void boxIfNeeded(PsiType type) {
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if (type instanceof PsiPrimitiveType && type != PsiType.VOID) {
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if (type == PsiType.LONG) {
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v.invokestatic("java/lang/Long", "valueOf", "(J)Ljava/lang/Long;");
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}
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else if (type == PsiType.INT) {
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v.invokestatic("java/lang/Integer", "valueOf", "(I)Ljava/lang/Integer;");
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}
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else {
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throw new UnsupportedOperationException("Don't know how to box type " + type);
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}
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}
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}
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private void unbox(PsiType type) {
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if (type instanceof PsiPrimitiveType) {
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if (type == PsiType.INT) {
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v.invokevirtual("java/lang/Integer", "intValue", "()I");
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}
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else {
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throw new UnsupportedOperationException("Don't know how to unbox type " + type);
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}
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}
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}
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private String getMethodDescriptor(PsiMethod method) {
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Type returnType = psiTypeToAsm(method.getReturnType());
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PsiParameter[] parameters = method.getParameterList().getParameters();
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Type[] parameterTypes = new Type[parameters.length];
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for (int i = 0; i < parameters.length; i++) {
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parameterTypes[i] = psiTypeToAsm(parameters [i].getType());
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}
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return Type.getMethodDescriptor(returnType, parameterTypes);
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}
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private Type psiTypeToAsm(PsiType type) {
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if (type instanceof PsiPrimitiveType) {
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if (type == PsiType.VOID) {
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return Type.VOID_TYPE;
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}
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if (type == PsiType.INT) {
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return Type.INT_TYPE;
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}
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if (type == PsiType.LONG) {
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return Type.LONG_TYPE;
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}
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}
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if (type instanceof PsiClassType) {
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PsiClass psiClass = ((PsiClassType) type).resolve();
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if (psiClass == null) {
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throw new UnsupportedOperationException("unresolved PsiClassType: " + type);
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}
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return Type.getType("L" + jvmName(psiClass) + ";");
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}
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throw new UnsupportedOperationException("don't know how to map type " + type + " to ASM");
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}
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@Override
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public void visitDotQualifiedExpression(JetDotQualifiedExpression expression) {
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JetExpression receiver = expression.getReceiverExpression();
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if (!resolvesToClassOrPackage(receiver)) {
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gen(expression.getReceiverExpression());
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}
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gen(expression.getSelectorExpression());
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}
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private boolean resolvesToClassOrPackage(JetExpression receiver) {
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if (receiver instanceof JetReferenceExpression) {
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DeclarationDescriptor declaration = bindingContext.resolveReferenceExpression((JetReferenceExpression) receiver);
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PsiElement declarationElement = bindingContext.getDeclarationPsiElement(declaration);
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if (declarationElement instanceof PsiClass) {
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return true;
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}
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}
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return false;
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}
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@Override
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public void visitSafeQualifiedExpression(JetSafeQualifiedExpression expression) {
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gen(expression.getReceiverExpression());
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Label ifnull = new Label();
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Label end = new Label();
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v.dup();
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v.ifnull(ifnull);
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gen(expression.getSelectorExpression());
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v.goTo(end);
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v.mark(ifnull);
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// null is already on stack here after the dup
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JetType expressionType = bindingContext.getExpressionType(expression);
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if (expressionType.equals(JetStandardClasses.getUnitType())) {
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v.pop();
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}
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v.mark(end);
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}
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@Override
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public void visitBinaryExpression(JetBinaryExpression expression) {
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if (expression.getOperationReference().getReferencedNameElementType() == JetTokens.EQ) {
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generateAssignmentExpression(expression);
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return;
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}
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DeclarationDescriptor op = bindingContext.resolveReferenceExpression(expression.getOperationReference());
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if (op instanceof FunctionDescriptor) {
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DeclarationDescriptor cls = op.getContainingDeclaration();
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if (cls instanceof ClassDescriptor && cls.getName().equals("Int")) {
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if (op.getName().equals("plus")) {
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JetType returnType = ((FunctionDescriptor) op).getUnsubstitutedReturnType();
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if (returnType.equals(stdlib.getIntType())) {
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gen(expression.getLeft(), Type.INT_TYPE);
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gen(expression.getRight(), Type.INT_TYPE);
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v.add(Type.INT_TYPE);
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myStack.push(StackValue.onStack(Type.INT_TYPE));
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return;
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}
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}
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}
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}
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throw new UnsupportedOperationException("Don't know how to generate binary op " + expression);
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}
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private void generateAssignmentExpression(JetBinaryExpression expression) {
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if (expression.getLeft() instanceof JetReferenceExpression) {
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final JetReferenceExpression lhs = (JetReferenceExpression) expression.getLeft();
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final DeclarationDescriptor declarationDescriptor = bindingContext.resolveReferenceExpression(lhs);
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final int index = myMap.getIndex(declarationDescriptor);
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final Type type = typeMapper.mapType(bindingContext.getExpressionType(lhs));
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gen(expression.getRight(), type);
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v.store(index, type);
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}
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else {
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throw new UnsupportedOperationException("Don't know how to generate assignment to " + expression.getLeft().getText());
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}
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}
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private boolean isUnitType(JetExpression e) {
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return false; // TODO:!!!
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}
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@Override
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public void visitProperty(JetProperty property) {
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PropertyDescriptor propertyDescriptor = bindingContext.getPropertyDescriptor(property);
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int index = myMap.getIndex(propertyDescriptor);
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assert index >= 0;
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JetExpression initializer = property.getInitializer();
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if (initializer != null) {
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Type type = typeMapper.mapType(propertyDescriptor.getOutType());
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gen(initializer, type);
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v.store(index, type);
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}
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}
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private static class CompilationException extends RuntimeException {
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}
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}
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