247 lines
9.1 KiB
C#
247 lines
9.1 KiB
C#
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//
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// Copyright (c) Microsoft Corporation. All rights reserved.
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//
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using System;
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using System.IO;
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namespace Bartok.MSIL
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{
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using System.Reflection;
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public class MetaDataFieldRVA: MetaDataObject {
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// Constructor Methods
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internal MetaDataFieldRVA(int rva, MetaDataField field) {
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this.rva = rva;
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this.field = field;
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}
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internal void resolveReferences(MetaDataLoader loader,
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PELoader peLoader,
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Stream fileStream) {
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this.field.resolveReferences(this);
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int dataOffset = peLoader.VaToOffsetSafe(this.rva);
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if (dataOffset != -1) {
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fileStream.Seek(dataOffset, SeekOrigin.Begin);
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BinaryReader reader = new BinaryReader(fileStream);
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SignatureField fieldSignature = (SignatureField)
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this.field.Signature;
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Signature.Type fieldType = fieldSignature.FieldType;
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int dataSize = this.getFieldSize(fieldType);
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byte[] data = new byte[dataSize];
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int count = reader.Read(data, 0, dataSize);
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if (loader.HasVtableFixup() &&
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loader.RVAHasRelocation(dataOffset) &&
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dataSize == 4) {
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// if this corresponds to a vtable label, we need to fix it
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int location = data[0] | (data[1] << 8) |
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(data[2] << 16) | (data[3] << 24);
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int imageBase = peLoader.getImageBase();
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location -= imageBase; // use RVA
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fileStream.Seek(location, SeekOrigin.Begin);
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BinaryReader binaryReader = new BinaryReader(fileStream);
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short prefix = binaryReader.ReadInt16();
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if (prefix == 0x25FF) { // this starts a vtable lable
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count = binaryReader.Read(data, 0, 4);
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}
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}
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this.dataBytes = data;
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if (count != dataSize) {
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throw new MetaDataLoader.IllegalMetaDataFormatException("Only got "+count+" out of "+dataSize+" data bytes for FieldRVA "+this.rva);
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}
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}
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else {
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Console.WriteLine("Found no data for "+this.field);
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}
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}
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// Access Methods
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public byte[] DataBytes {
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get {
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return this.dataBytes;
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}
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}
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public MetaDataField Field {
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get {
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return this.field;
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}
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}
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public int RVA {
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get {
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return this.rva;
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}
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}
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// Helper Methods
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private int getFieldSize(Signature.Type fieldType) {
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switch (fieldType.ElementType) {
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case ElementTypes.VOID:
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return 0;
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case ElementTypes.BOOLEAN:
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case ElementTypes.I1:
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case ElementTypes.U1:
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return 1;
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case ElementTypes.CHAR:
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case ElementTypes.I2:
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case ElementTypes.U2:
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return 2;
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case ElementTypes.I4:
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case ElementTypes.U4:
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case ElementTypes.R4:
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return 4;
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case ElementTypes.I8:
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case ElementTypes.U8:
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case ElementTypes.R8:
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return 8;
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case ElementTypes.OBJECT:
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case ElementTypes.STRING:
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case ElementTypes.FNPTR:
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case ElementTypes.CLASS:
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case ElementTypes.PTR:
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case ElementTypes.BYREF:
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case ElementTypes.U:
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case ElementTypes.I:
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return machineIntSize;
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case ElementTypes.TYPEDBYREF:
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return 2*machineIntSize;
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case ElementTypes.VALUETYPE: {
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MetaDataObject classObject = fieldType.ClassObject;
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if (!(classObject is MetaDataTypeDefinition)) {
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return -1;
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}
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MetaDataTypeDefinition typedef = (MetaDataTypeDefinition) classObject;
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if ((typedef.Flags & TypeAttributes.Interface) != 0 ||
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(typedef.Flags & TypeAttributes.Abstract) != 0) {
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return -1;
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}
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int classSize = 0;
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int packSize = 0;
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if (typedef.ClassLayout != null) {
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classSize = typedef.ClassLayout.ClassSize;
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packSize = typedef.ClassLayout.PackingSize;
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}
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int instanceFieldSize = 0;
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if ((typedef.Flags & TypeAttributes.ExplicitLayout) != 0) {
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foreach (MetaDataField mdField in typedef.Fields) {
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if ((mdField.Flags & (int) MetaDataField.FieldAttributes.Static) == 0) {
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Signature.Type nestedFieldType =
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((SignatureField) mdField.Signature).FieldType;
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int fieldSize = this.getFieldSize(nestedFieldType);
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int offset = mdField.Layout.Offset;
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int fieldEnd = fieldSize + offset;
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if (fieldEnd > instanceFieldSize) {
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instanceFieldSize = fieldEnd;
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}
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}
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}
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}
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else {
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foreach (MetaDataField mdField in typedef.Fields) {
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if ((mdField.Flags & (int) MetaDataField.FieldAttributes.Static) == 0) {
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Signature.Type nestedFieldType =
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((SignatureField) mdField.Signature).FieldType;
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int fieldSize = this.getFieldSize(nestedFieldType);
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if (fieldSize == -1) {
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return -1;
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}
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if (packSize > 1) {
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int delta = instanceFieldSize % packSize;
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if (delta > 0) {
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instanceFieldSize += packSize - delta;
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}
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}
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instanceFieldSize += fieldSize;
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}
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}
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}
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if (instanceFieldSize > classSize) {
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return instanceFieldSize;
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}
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else if (classSize > 0) {
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return classSize;
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}
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else {
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return 1;
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}
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}
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case ElementTypes.ARRAY: {
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int elementCount = 1;
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uint[] lowerBounds = fieldType.LowerBounds;
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uint[] upperBounds = fieldType.UpperBounds;
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int rank = upperBounds.Length;
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for (int i = 0; i < rank; i++) {
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int dimSize = (int) (upperBounds[i] - lowerBounds[i]);
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if (dimSize == 0) {
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// Must be an array of pointers to other arrays
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return elementCount * machineIntSize;
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}
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else {
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elementCount *= dimSize;
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}
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}
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int elementSize = this.getFieldSize(fieldType.TypeObject);
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return elementCount * elementSize;
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}
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case ElementTypes.CMOD_REQD:
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case ElementTypes.CMOD_OPT:
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return this.getFieldSize(fieldType.TypeObject);
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case ElementTypes.PINNED:
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return this.getFieldSize(fieldType.TypeObject);
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case ElementTypes.SZARRAY:
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// Should be machine dependent!
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return 4;
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case ElementTypes.SENTINEL:
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case ElementTypes.END:
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default:
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return -1;
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}
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}
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// Debug Methods
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public override String ToString() {
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System.Text.StringBuilder sb =
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new System.Text.StringBuilder("MetaDataFieldRVA(");
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sb.Append(this.field);
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sb.Append(",");
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if (this.dataBytes == null) {
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sb.Append(this.rva);
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}
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else {
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sb.Append("[");
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int count = this.dataBytes.Length;
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if (count > 0) {
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sb.Append(this.dataBytes[0].ToString("x2"));
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for (int i = 1; i < count; i++) {
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sb.Append(",");
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sb.Append(this.dataBytes[i].ToString("x2"));
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}
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}
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sb.Append("]");
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}
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sb.Append(")");
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return sb.ToString();
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}
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// State
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private readonly int rva;
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private byte[] dataBytes;
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private readonly MetaDataField field;
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// BUGBUG: Should be machine dependent!
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private const int machineIntSize = 4;
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}
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}
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