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EventTraceOperandExpressionBuilder.cs
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EventTraceOperandExpressionBuilder.cs
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namespace ETWDeserializer
{
using System;
using System.Collections.Generic;
using System.Linq;
using System.Linq.Expressions;
using System.Reflection;
internal static class EventTraceOperandExpressionBuilder
{
public static Expression Build(
IEventTraceOperand operand,
ParameterExpression eventRecordReader,
ParameterExpression eventRecordWriter,
ParameterExpression eventMetadataTable,
ParameterExpression runtimeMetadata)
{
return new EventTraceOperandExpressionBuilderImpl().Build(operand, eventRecordReader, eventRecordWriter, eventMetadataTable, runtimeMetadata);
}
public static MethodCallExpression Call(this ParameterExpression instance, string methodName, params Expression[] arguments)
{
Type[] parameterTypes = arguments.Select(t => t.Type).ToArray();
var methodInfo = instance.Type.GetMethod(methodName, parameterTypes);
return Expression.Call(instance, methodInfo, arguments);
}
}
internal sealed class EventTraceOperandExpressionBuilderImpl
{
public Expression Build(IEventTraceOperand operand, ParameterExpression eventRecordReader, ParameterExpression eventRecordWriter, ParameterExpression eventMetadataTable, ParameterExpression runtimeMetadata)
{
var eventMetadata = Expression.Parameter(typeof(EventMetadata));
var properties = Expression.Parameter(typeof(PropertyMetadata[]));
var variables = new List<ParameterExpression>
{
eventMetadata,
properties
};
var expGenerator = new ExpressionGenerator(eventRecordReader, eventRecordWriter, properties);
var list = new List<Expression>
{
Expression.Assign(eventMetadata, Expression.ArrayAccess(eventMetadataTable, Expression.Constant(operand.EventMetadataTableIndex))),
Expression.Assign(properties, Expression.PropertyOrField(eventMetadata, "Properties")),
eventRecordWriter.Call("WriteEventBegin", eventMetadata, runtimeMetadata),
expGenerator.CodeGenerate(operand.EventPropertyOperands),
eventRecordWriter.Call("WriteEventEnd")
};
var returnExpression = Expression.Block(variables, list);
return returnExpression;
}
private sealed class ExpressionGenerator
{
private readonly Dictionary<IEventTracePropertyOperand, Expression> operandReferenceTable = new Dictionary<IEventTracePropertyOperand, Expression>();
private readonly ParameterExpression eventRecordReader;
private readonly ParameterExpression eventRecordWriter;
private readonly ParameterExpression properties;
public ExpressionGenerator(ParameterExpression eventRecordReader, ParameterExpression eventRecordWriter, ParameterExpression properties)
{
this.eventRecordReader = eventRecordReader;
this.eventRecordWriter = eventRecordWriter;
this.properties = properties;
}
public Expression CodeGenerate(IEnumerable<IEventTracePropertyOperand> operands)
{
var variables = new List<ParameterExpression>();
var list = new List<Expression>();
foreach (var operand in operands)
{
var inType = operand.Metadata.InType;
Expression c; /* running expression for this operand */
list.Add(this.eventRecordWriter.Call("WritePropertyBegin", Expression.ArrayAccess(this.properties, Expression.Constant(operand.PropertyIndex))));
/* if struct, recurse */
if (operand.Children.Count > 0)
{
c = Expression.Block(
this.eventRecordWriter.Call("WriteStructBegin"),
this.CodeGenerate(operand.Children),
this.eventRecordWriter.Call("WriteStructEnd"));
}
else
{
Expression readValue;
/* otherwise, if operand has a length parameter, look it up or make constant */
if (operand.IsVariableLength || operand.IsFixedLength)
{
var length = operand.IsVariableLength
? this.operandReferenceTable[operand.VariableLengthSize]
: Expression.Constant(operand.FixedLengthSize);
readValue = Call(this.eventRecordReader, inType.ReadMethodInfo(this.eventRecordReader.Type, length.Type), length);
}
/* otherwise, it's just a normal call, no args */
else
{
readValue = Call(this.eventRecordReader, inType.ReadMethodInfo(this.eventRecordReader.Type));
}
/* save the operand because someone else maybe needing it */
/* and change the running variable */
if (operand.IsReferencedByOtherProperties)
{
var local = Expression.Parameter(inType.CSharpType(), operand.Metadata.Name);
this.operandReferenceTable.Add(operand, local);
variables.Add(local);
c = Expression.Block(Expression.Assign(local, readValue), Call(this.eventRecordWriter, inType.WriteMethodInfo(this.eventRecordWriter.Type, local.Type), local));
}
else
{
c = Call(this.eventRecordWriter, inType.WriteMethodInfo(this.eventRecordWriter.Type, inType.CSharpType()), readValue);
}
}
if (operand.IsVariableArray || operand.IsFixedArray)
{
var loopVariable = Expression.Parameter(typeof(int));
variables.Add(loopVariable);
var end = operand.IsVariableArray
? this.operandReferenceTable[operand.VariableArraySize]
: Expression.Constant(operand.FixedArraySize);
var expr = (Expression)loopVariable;
ConvertIfNecessary(ref expr, ref end);
list.Add(this.eventRecordWriter.Call("WriteArrayBegin"));
list.Add(For(loopVariable, Expression.Constant(0), Expression.LessThan(expr, end), Expression.AddAssign(loopVariable, Expression.Constant(1)), c));
list.Add(this.eventRecordWriter.Call("WriteArrayEnd"));
}
else
{
list.Add(c);
}
list.Add(this.eventRecordWriter.Call("WritePropertyEnd"));
}
return list.Count == 0 ? (Expression)Expression.Empty() : Expression.Block(variables, list);
}
private static MethodCallExpression Call(ParameterExpression instance, MethodInfo methodInfo, params Expression[] arguments)
{
return Expression.Call(instance, methodInfo, arguments);
}
private static Expression For(ParameterExpression parameter, Expression initial, Expression condition, Expression increment, params Expression[] body)
{
var breakLabel = Expression.Label("break");
var loop = Expression.Block(
new[] { parameter },
Expression.Assign(parameter, initial),
Expression.Loop(
Expression.IfThenElse(
condition,
Expression.Block(
body.Concat(new[] { increment })),
Expression.Break(breakLabel)),
breakLabel));
return loop;
}
private static void ConvertIfNecessary(ref Expression left, ref Expression right)
{
var leftTypeCode = Type.GetTypeCode(left.Type);
var rightTypeCode = Type.GetTypeCode(right.Type);
if (leftTypeCode == rightTypeCode)
{
return;
}
if (leftTypeCode > rightTypeCode)
{
right = Expression.Convert(right, left.Type);
}
else
{
left = Expression.Convert(left, right.Type);
}
}
}
}
}