X-Git-Url: http://git.phpeclipse.com

diff --git a/net.sourceforge.phpeclipse/src/net/sourceforge/phpdt/internal/compiler/ast/Expression.java b/net.sourceforge.phpeclipse/src/net/sourceforge/phpdt/internal/compiler/ast/Expression.java
index d935982..0b6c568 100644
--- a/net.sourceforge.phpeclipse/src/net/sourceforge/phpdt/internal/compiler/ast/Expression.java
+++ b/net.sourceforge.phpeclipse/src/net/sourceforge/phpdt/internal/compiler/ast/Expression.java
@@ -1,33 +1,527 @@
+/*******************************************************************************
+ * Copyright (c) 2000, 2003 IBM Corporation and others.
+ * All rights reserved. This program and the accompanying materials 
+ * are made available under the terms of the Common Public License v1.0
+ * which accompanies this distribution, and is available at
+ * http://www.eclipse.org/legal/cpl-v10.html
+ * 
+ * Contributors:
+ *     IBM Corporation - initial API and implementation
+ *******************************************************************************/
 package net.sourceforge.phpdt.internal.compiler.ast;
 
+import net.sourceforge.phpdt.internal.compiler.flow.FlowContext;
+import net.sourceforge.phpdt.internal.compiler.flow.FlowInfo;
+import net.sourceforge.phpdt.internal.compiler.impl.Constant;
+import net.sourceforge.phpdt.internal.compiler.lookup.BaseTypeBinding;
+import net.sourceforge.phpdt.internal.compiler.lookup.BlockScope;
+import net.sourceforge.phpdt.internal.compiler.lookup.TypeBinding;
 
-/**
- * An expression.
- * @author Matthieu Casanova
- */
-public abstract class Expression extends Statement {
-
-  /**
-   * Create an expression giving starting and ending offset
-   * @param sourceStart starting offset
-   * @param sourceEnd ending offset
-   */
-  public Expression(final int sourceStart, final int sourceEnd) {
-    super(sourceStart, sourceEnd);
-  }
-
-  /**
-   * Return the expression with a number of spaces before.
-   * @param tab how many spaces before the expression
-   * @return a string representing the expression
-   */
-  public String toString(final int tab) {
-    return tabString(tab) + toStringExpression();
-  }
-
-  /**
-   * Return the expression as String.
-   * @return the expression
-   */
-  public abstract String toStringExpression();
+public class Expression extends Statement {
+
+	// some expression may not be used - from a java semantic point
+	// of view only - as statements. Other may. In order to avoid the creation
+	// of wrappers around expression in order to tune them as expression
+	// Expression is a subclass of Statement. See the message
+	// isValidJavaStatement()
+
+	public int implicitConversion;
+
+	public TypeBinding resolvedType;
+
+	public Constant constant;
+
+	public Expression() {
+		super();
+	}
+
+	public FlowInfo analyseCode(BlockScope currentScope,
+			FlowContext flowContext, FlowInfo flowInfo) {
+
+		return flowInfo;
+	}
+
+	public FlowInfo analyseCode(BlockScope currentScope,
+			FlowContext flowContext, FlowInfo flowInfo, boolean valueRequired) {
+
+		return analyseCode(currentScope, flowContext, flowInfo);
+	}
+
+	/**
+	 * Constant usable for bytecode pattern optimizations, but cannot be inlined
+	 * since it is not strictly equivalent to the definition of constant
+	 * expressions. In particular, some side-effects may be required to occur
+	 * (only the end value is known). Constant is known to be of boolean type
+	 */
+	public Constant optimizedBooleanConstant() {
+
+		return this.constant;
+	}
+
+	public static final boolean isConstantValueRepresentable(Constant constant,
+			int constantTypeID, int targetTypeID) {
+
+		// true if there is no loss of precision while casting.
+		// constantTypeID == constant.typeID
+		if (targetTypeID == constantTypeID)
+			return true;
+		switch (targetTypeID) {
+		case T_char:
+			switch (constantTypeID) {
+			case T_char:
+				return true;
+			case T_double:
+				return constant.doubleValue() == constant.charValue();
+			case T_float:
+				return constant.floatValue() == constant.charValue();
+			case T_int:
+				return constant.intValue() == constant.charValue();
+			case T_short:
+				return constant.shortValue() == constant.charValue();
+			case T_byte:
+				return constant.byteValue() == constant.charValue();
+			case T_long:
+				return constant.longValue() == constant.charValue();
+			default:
+				return false;// boolean
+			}
+
+		case T_float:
+			switch (constantTypeID) {
+			case T_char:
+				return constant.charValue() == constant.floatValue();
+			case T_double:
+				return constant.doubleValue() == constant.floatValue();
+			case T_float:
+				return true;
+			case T_int:
+				return constant.intValue() == constant.floatValue();
+			case T_short:
+				return constant.shortValue() == constant.floatValue();
+			case T_byte:
+				return constant.byteValue() == constant.floatValue();
+			case T_long:
+				return constant.longValue() == constant.floatValue();
+			default:
+				return false;// boolean
+			}
+
+		case T_double:
+			switch (constantTypeID) {
+			case T_char:
+				return constant.charValue() == constant.doubleValue();
+			case T_double:
+				return true;
+			case T_float:
+				return constant.floatValue() == constant.doubleValue();
+			case T_int:
+				return constant.intValue() == constant.doubleValue();
+			case T_short:
+				return constant.shortValue() == constant.doubleValue();
+			case T_byte:
+				return constant.byteValue() == constant.doubleValue();
+			case T_long:
+				return constant.longValue() == constant.doubleValue();
+			default:
+				return false; // boolean
+			}
+
+		case T_byte:
+			switch (constantTypeID) {
+			case T_char:
+				return constant.charValue() == constant.byteValue();
+			case T_double:
+				return constant.doubleValue() == constant.byteValue();
+			case T_float:
+				return constant.floatValue() == constant.byteValue();
+			case T_int:
+				return constant.intValue() == constant.byteValue();
+			case T_short:
+				return constant.shortValue() == constant.byteValue();
+			case T_byte:
+				return true;
+			case T_long:
+				return constant.longValue() == constant.byteValue();
+			default:
+				return false; // boolean
+			}
+
+		case T_short:
+			switch (constantTypeID) {
+			case T_char:
+				return constant.charValue() == constant.shortValue();
+			case T_double:
+				return constant.doubleValue() == constant.shortValue();
+			case T_float:
+				return constant.floatValue() == constant.shortValue();
+			case T_int:
+				return constant.intValue() == constant.shortValue();
+			case T_short:
+				return true;
+			case T_byte:
+				return constant.byteValue() == constant.shortValue();
+			case T_long:
+				return constant.longValue() == constant.shortValue();
+			default:
+				return false; // boolean
+			}
+
+		case T_int:
+			switch (constantTypeID) {
+			case T_char:
+				return constant.charValue() == constant.intValue();
+			case T_double:
+				return constant.doubleValue() == constant.intValue();
+			case T_float:
+				return constant.floatValue() == constant.intValue();
+			case T_int:
+				return true;
+			case T_short:
+				return constant.shortValue() == constant.intValue();
+			case T_byte:
+				return constant.byteValue() == constant.intValue();
+			case T_long:
+				return constant.longValue() == constant.intValue();
+			default:
+				return false; // boolean
+			}
+
+		case T_long:
+			switch (constantTypeID) {
+			case T_char:
+				return constant.charValue() == constant.longValue();
+			case T_double:
+				return constant.doubleValue() == constant.longValue();
+			case T_float:
+				return constant.floatValue() == constant.longValue();
+			case T_int:
+				return constant.intValue() == constant.longValue();
+			case T_short:
+				return constant.shortValue() == constant.longValue();
+			case T_byte:
+				return constant.byteValue() == constant.longValue();
+			case T_long:
+				return true;
+			default:
+				return false; // boolean
+			}
+
+		default:
+			return false; // boolean
+		}
+	}
+
+	/**
+	 * Expression statements are plain expressions, however they generate like
+	 * normal expressions with no value required.
+	 * 
+	 * @param currentScope
+	 *            net.sourceforge.phpdt.internal.compiler.lookup.BlockScope
+	 * @param codeStream
+	 *            net.sourceforge.phpdt.internal.compiler.codegen.CodeStream
+	 */
+	// public void generateCode(BlockScope currentScope, CodeStream codeStream)
+	// {
+	//
+	// if ((bits & IsReachableMASK) == 0) {
+	// return;
+	// }
+	// generateCode(currentScope, codeStream, false);
+	// }
+	/**
+	 * Every expression is responsible for generating its implicit conversion
+	 * when necessary.
+	 * 
+	 * @param currentScope
+	 *            net.sourceforge.phpdt.internal.compiler.lookup.BlockScope
+	 * @param codeStream
+	 *            net.sourceforge.phpdt.internal.compiler.codegen.CodeStream
+	 * @param valueRequired
+	 *            boolean
+	 */
+	// public void generateCode(
+	// BlockScope currentScope,
+	// CodeStream codeStream,
+	// boolean valueRequired) {
+	//
+	// if (constant != NotAConstant) {
+	// // generate a constant expression
+	// int pc = codeStream.position;
+	// codeStream.generateConstant(constant, implicitConversion);
+	// codeStream.recordPositionsFrom(pc, this.sourceStart);
+	// } else {
+	// // actual non-constant code generation
+	// throw new ShouldNotImplement(ProjectPrefUtil.bind("ast.missingCode"));
+	// //$NON-NLS-1$
+	// }
+	// }
+	/**
+	 * Default generation of a boolean value
+	 */
+	// public void generateOptimizedBoolean(
+	// BlockScope currentScope,
+	// CodeStream codeStream,
+	// Label trueLabel,
+	// Label falseLabel,
+	// boolean valueRequired) {
+	//
+	// // a label valued to nil means: by default we fall through the case...
+	// // both nil means we leave the value on the stack
+	//
+	// if ((constant != Constant.NotAConstant) && (constant.typeID() ==
+	// T_boolean)) {
+	// int pc = codeStream.position;
+	// if (constant.booleanValue() == true) {
+	// // constant == true
+	// if (valueRequired) {
+	// if (falseLabel == null) {
+	// // implicit falling through the FALSE case
+	// if (trueLabel != null) {
+	// codeStream.goto_(trueLabel);
+	// }
+	// }
+	// }
+	// } else {
+	// if (valueRequired) {
+	// if (falseLabel != null) {
+	// // implicit falling through the TRUE case
+	// if (trueLabel == null) {
+	// codeStream.goto_(falseLabel);
+	// }
+	// }
+	// }
+	// }
+	// codeStream.recordPositionsFrom(pc, this.sourceStart);
+	// return;
+	// }
+	// generateCode(currentScope, codeStream, valueRequired);
+	// // branching
+	// int position = codeStream.position;
+	// if (valueRequired) {
+	// if (falseLabel == null) {
+	// if (trueLabel != null) {
+	// // Implicit falling through the FALSE case
+	// codeStream.ifne(trueLabel);
+	// }
+	// } else {
+	// if (trueLabel == null) {
+	// // Implicit falling through the TRUE case
+	// codeStream.ifeq(falseLabel);
+	// } else {
+	// // No implicit fall through TRUE/FALSE --> should never occur
+	// }
+	// }
+	// }
+	// // reposition the endPC
+	// codeStream.updateLastRecordedEndPC(position);
+	// }
+	//
+	// /* Optimized (java) code generation for string concatenations that
+	// involve StringBuffer
+	// * creation: going through this path means that there is no need for a new
+	// StringBuffer
+	// * creation, further operands should rather be only appended to the
+	// current one.
+	// * By default: no optimization.
+	// */
+	// public void generateOptimizedStringBuffer(
+	// BlockScope blockScope,
+	// net.sourceforge.phpdt.internal.compiler.codegen.CodeStream codeStream,
+	// int typeID) {
+	//
+	// generateCode(blockScope, codeStream, true);
+	// codeStream.invokeStringBufferAppendForType(typeID);
+	// }
+	/*
+	 * Optimized (java) code generation for string concatenations that involve
+	 * StringBuffer creation: going through this path means that there is no
+	 * need for a new StringBuffer creation, further operands should rather be
+	 * only appended to the current one.
+	 */
+	// public void generateOptimizedStringBufferCreation(
+	// BlockScope blockScope,
+	// CodeStream codeStream,
+	// int typeID) {
+	//
+	// // Optimization only for integers and strings
+	// if (typeID == T_Object) {
+	// // in the case the runtime value of valueOf(Object) returns null, we have
+	// to use append(Object) instead of directly valueOf(Object)
+	// // append(Object) returns append(valueOf(Object)), which means that the
+	// null case is handled by append(String).
+	// codeStream.newStringBuffer();
+	// codeStream.dup();
+	// codeStream.invokeStringBufferDefaultConstructor();
+	// generateCode(blockScope, codeStream, true);
+	// codeStream.invokeStringBufferAppendForType(T_Object);
+	// return;
+	// }
+	// codeStream.newStringBuffer();
+	// codeStream.dup();
+	// if (typeID == T_String || typeID == T_null) {
+	// if (constant != NotAConstant) {
+	// codeStream.ldc(constant.stringValue());
+	// } else {
+	// generateCode(blockScope, codeStream, true);
+	// codeStream.invokeStringValueOf(T_Object);
+	// }
+	// } else {
+	// generateCode(blockScope, codeStream, true);
+	// codeStream.invokeStringValueOf(typeID);
+	// }
+	// codeStream.invokeStringBufferStringConstructor();
+	// }
+	// Base types need that the widening is explicitly done by the compiler
+	// using some bytecode like i2f
+	public void implicitWidening(TypeBinding runtimeTimeType,
+			TypeBinding compileTimeType) {
+
+		if (runtimeTimeType == null || compileTimeType == null)
+			return;
+
+		// if (compileTimeType.id == T_null) {
+		// // this case is possible only for constant null
+		// // The type of runtime is a reference type
+		// // The code gen use the constant id thus any value
+		// // for the runtime id (akak the <<4) could be used.
+		// // T_Object is used as some general T_reference
+		// implicitConversion = (T_Object << 4) + T_null;
+		// return;
+		// }
+
+		switch (runtimeTimeType.id) {
+		case T_byte:
+		case T_short:
+		case T_char:
+			implicitConversion = (T_int << 4) + compileTimeType.id;
+			break;
+		case T_String:
+		case T_float:
+		case T_boolean:
+		case T_double:
+		case T_int: // implicitConversion may result in i2i which will result in
+					// NO code gen
+		case T_long:
+			implicitConversion = (runtimeTimeType.id << 4) + compileTimeType.id;
+			break;
+		default: // nothing on regular object ref
+		}
+	}
+
+	public boolean isCompactableOperation() {
+
+		return false;
+	}
+
+	// Return true if the conversion is done AUTOMATICALLY by the vm
+	// while the javaVM is an int based-machine, thus for example pushing
+	// a byte onto the stack , will automatically creates a int on the stack
+	// (this request some work d be done by the VM on signed numbers)
+	public boolean isConstantValueOfTypeAssignableToType(
+			TypeBinding constantType, TypeBinding targetType) {
+
+		if (constant == Constant.NotAConstant)
+			return false;
+		if (constantType == targetType)
+			return true;
+		if (constantType.isBaseType() && targetType.isBaseType()) {
+			// No free assignment conversion from anything but to integral ones.
+			if ((constantType == IntBinding || BaseTypeBinding.isWidening(
+					T_int, constantType.id))
+					&& (BaseTypeBinding.isNarrowing(targetType.id, T_int))) {
+				// use current explicit conversion in order to get some new
+				// value to compare with current one
+				return isConstantValueRepresentable(constant, constantType.id,
+						targetType.id);
+			}
+		}
+		return false;
+	}
+
+	public boolean isTypeReference() {
+		return false;
+	}
+
+	public StringBuffer print(int indent, StringBuffer output) {
+		printIndent(indent, output);
+		return printExpression(indent, output);
+	}
+
+	public StringBuffer printExpression(int indent, StringBuffer output) {
+		output.append(super.toString(0));
+		return output;
+	}
+
+	public StringBuffer printStatement(int indent, StringBuffer output) {
+		return print(indent, output).append(";"); //$NON-NLS-1$
+	}
+
+	public void resolve(BlockScope scope) {
+		// drops the returning expression's type whatever the type is.
+
+		this.resolveType(scope);
+		return;
+	}
+
+	public TypeBinding resolveType(BlockScope scope) {
+		// by default... subclasses should implement a better TC if required.
+
+		return null;
+	}
+
+	public TypeBinding resolveTypeExpecting(BlockScope scope,
+			TypeBinding expectedType) {
+
+		TypeBinding expressionType = this.resolveType(scope);
+		if (expressionType == null)
+			return null;
+		if (expressionType == expectedType)
+			return expressionType;
+
+		if (!expressionType.isCompatibleWith(expectedType)) {
+			scope.problemReporter().typeMismatchError(expressionType,
+					expectedType, this);
+			return null;
+		}
+		return expressionType;
+	}
+
+	public String toString(int tab) {
+
+		// Subclass re-define toStringExpression
+		String s = tabString(tab);
+		if (constant != null)
+			// before TC has runned
+			if (constant != NotAConstant)
+				// after the TC has runned
+				s += " /*cst:" + constant.toString() + "*/ "; //$NON-NLS-1$ //$NON-NLS-2$
+		return s + toStringExpression(tab);
+	}
+
+	// Subclass re-define toStringExpression
+	// This method is abstract and should never be called
+	// but we provide some code that is running.....just in case
+	// of developpement time (while every thing is not built)
+	public String toStringExpression() {
+
+		return super.toString(0);
+	}
+
+	public String toStringExpression(int tab) {
+		// default is regular toString expression (qualified allocation
+		// expressions redifine this method)
+		return this.toStringExpression();
+	}
+
+	public Expression toTypeReference() {
+		// by default undefined
+
+		// this method is meanly used by the parser in order to transform
+		// an expression that is used as a type reference in a cast ....
+		// --appreciate the fact that castExpression and
+		// ExpressionWithParenthesis
+		// --starts with the same pattern.....
+
+		return this;
+	}
 }