127 lines
3.8 KiB
C#
127 lines
3.8 KiB
C#
//
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// Permission is hereby granted, free of charge, to any person obtaining
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// a copy of this software and associated documentation files (the
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// "Software"), to deal in the Software without restriction, including
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// without limitation the rights to use, copy, modify, merge, publish,
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// distribute, sublicense, and/or sell copies of the Software, and to
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// permit persons to whom the Software is furnished to do so, subject to
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// the following conditions:
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//
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// The above copyright notice and this permission notice shall be
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// included in all copies or substantial portions of the Software.
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//
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// THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,
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// EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
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// MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND
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// NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS BE
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// LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION
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// OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION
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// WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
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//
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// Copyright (C) Lluis Sanchez Gual, 2004
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//
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#if !FULL_AOT_RUNTIME
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using System;
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using System.Collections;
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using System.Reflection;
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using System.Reflection.Emit;
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namespace Mono.CodeGeneration
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{
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public class CodeForeach: CodeStatement
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{
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Type itemType;
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CodeExpression array;
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CodeBlock forBlock;
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CodeVariableDeclaration itemDec;
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public CodeForeach (CodeExpression array, Type itemType)
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{
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this.array = array;
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this.itemType = itemType;
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Type t = array.GetResultType ();
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if (!t.IsArray && t.GetMethod ("GetEnumerator", Type.EmptyTypes) == null)
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throw new InvalidOperationException ("foreach statement cannot operate on variables of type `" + t + "' because that class does not provide a GetEnumerator method or it is inaccessible");
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itemDec = new CodeVariableDeclaration (itemType, "item");
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}
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public CodeValueReference ItemExpression
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{
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get { return itemDec.Variable; }
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}
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public CodeBlock ForBlock
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{
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get { return forBlock; }
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set { forBlock = value; }
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}
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public override void Generate (ILGenerator gen)
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{
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Type t = array.GetResultType ();
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if (t.IsArray)
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{
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CodeBlock block = new CodeBlock();
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CodeVariableDeclaration indexDec;
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CodeWhile cw;
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CodeValueReference index;
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CodeValueReference item;
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block.Add (itemDec);
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item = itemDec.Variable;
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block.Add (indexDec = new CodeVariableDeclaration (typeof(int), "n"));
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index = indexDec.Variable;
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block.Add (new CodeAssignment (index, new CodeLiteral (0)));
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block.Add (cw = new CodeWhile (CodeExpression.IsSmallerThan (index, array.ArrayLength)));
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CodeBlock loopBlock = new CodeBlock ();
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loopBlock.Add (new CodeAssignment (item, array[index]));
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loopBlock.Add (new CodeIncrement(index));
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loopBlock.Add (forBlock);
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cw.WhileBlock = loopBlock;
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block.Generate (gen);
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}
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else
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{
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CodeBlock block = new CodeBlock();
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CodeVariableDeclaration dec;
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CodeWhile cw;
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CodeValueReference enumerator;
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CodeValueReference item;
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block.Add (itemDec);
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item = itemDec.Variable;
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block.Add (dec = new CodeVariableDeclaration (typeof(IEnumerator), "e"));
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enumerator = dec.Variable;
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block.Add (new CodeAssignment (enumerator, array.Call("GetEnumerator")));
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block.Add (cw = new CodeWhile (enumerator.Call ("MoveNext")));
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CodeBlock loopBlock = new CodeBlock ();
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loopBlock.Add (new CodeAssignment (item, enumerator["Current"]));
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loopBlock.Add (forBlock);
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cw.WhileBlock = loopBlock;
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block.Generate (gen);
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}
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}
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public override void PrintCode (CodeWriter cp)
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{
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cp.Write ("foreach (" + itemType + " item in ");
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array.PrintCode (cp);
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cp.Write (") {");
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cp.EndLine ();
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cp.Indent ();
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forBlock.PrintCode (cp);
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cp.Unindent ();
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cp.BeginLine ().Write ("}");
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}
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}
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}
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#endif
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