578 lines
17 KiB
C#
578 lines
17 KiB
C#
|
//
|
||
|
|
// CodeWriter.cs
|
||
|
|
//
|
||
|
|
// Author:
|
||
|
|
// Jb Evain (jbevain@gmail.com)
|
||
|
|
//
|
||
|
|
// (C) 2005 - 2007 Jb Evain
|
||
|
|
//
|
||
|
|
// Permission is hereby granted, free of charge, to any person obtaining
|
||
|
|
// a copy of this software and associated documentation files (the
|
||
|
|
// "Software"), to deal in the Software without restriction, including
|
||
|
|
// without limitation the rights to use, copy, modify, merge, publish,
|
||
|
|
// distribute, sublicense, and/or sell copies of the Software, and to
|
||
|
|
// permit persons to whom the Software is furnished to do so, subject to
|
||
|
|
// the following conditions:
|
||
|
|
//
|
||
|
|
// The above copyright notice and this permission notice shall be
|
||
|
|
// included in all copies or substantial portions of the Software.
|
||
|
|
//
|
||
|
|
// THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,
|
||
|
|
// EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
|
||
|
|
// MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND
|
||
|
|
// NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS BE
|
||
|
|
// LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION
|
||
|
|
// OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION
|
||
|
|
// WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
|
||
|
|
//
|
||
|
|
|
||
|
|
namespace Mono.Cecil.Cil {
|
||
|
|
|
||
|
|
using System;
|
||
|
|
using System.Collections;
|
||
|
|
|
||
|
|
using Mono.Cecil;
|
||
|
|
using Mono.Cecil.Binary;
|
||
|
|
using Mono.Cecil.Metadata;
|
||
|
|
using Mono.Cecil.Signatures;
|
||
|
|
|
||
|
|
sealed class CodeWriter : BaseCodeVisitor {
|
||
|
|
|
||
|
|
ReflectionWriter m_reflectWriter;
|
||
|
|
MemoryBinaryWriter m_binaryWriter;
|
||
|
|
MemoryBinaryWriter m_codeWriter;
|
||
|
|
|
||
|
|
IDictionary m_localSigCache;
|
||
|
|
IDictionary m_standaloneSigCache;
|
||
|
|
|
||
|
|
IDictionary m_stackSizes;
|
||
|
|
|
||
|
|
bool stripped;
|
||
|
|
|
||
|
|
public bool Stripped {
|
||
|
|
get { return stripped; }
|
||
|
|
set { stripped = value; }
|
||
|
|
}
|
||
|
|
|
||
|
|
public CodeWriter (ReflectionWriter reflectWriter, MemoryBinaryWriter writer)
|
||
|
|
{
|
||
|
|
m_reflectWriter = reflectWriter;
|
||
|
|
m_binaryWriter = writer;
|
||
|
|
m_codeWriter = new MemoryBinaryWriter ();
|
||
|
|
|
||
|
|
m_localSigCache = new Hashtable ();
|
||
|
|
m_standaloneSigCache = new Hashtable ();
|
||
|
|
|
||
|
|
m_stackSizes = new Hashtable ();
|
||
|
|
}
|
||
|
|
|
||
|
|
public RVA WriteMethodBody (MethodDefinition meth)
|
||
|
|
{
|
||
|
|
if (meth.Body == null)
|
||
|
|
return RVA.Zero;
|
||
|
|
|
||
|
|
RVA ret = m_reflectWriter.MetadataWriter.GetDataCursor ();
|
||
|
|
meth.Body.Accept (this);
|
||
|
|
return ret;
|
||
|
|
}
|
||
|
|
|
||
|
|
public override void VisitMethodBody (MethodBody body)
|
||
|
|
{
|
||
|
|
m_codeWriter.Empty ();
|
||
|
|
}
|
||
|
|
|
||
|
|
void WriteToken (MetadataToken token)
|
||
|
|
{
|
||
|
|
if (token.RID == 0)
|
||
|
|
m_codeWriter.Write (0);
|
||
|
|
else
|
||
|
|
m_codeWriter.Write (token.ToUInt ());
|
||
|
|
}
|
||
|
|
|
||
|
|
static int GetParameterIndex (MethodBody body, ParameterDefinition p)
|
||
|
|
{
|
||
|
|
int idx = body.Method.Parameters.IndexOf (p);
|
||
|
|
if (idx == -1 && p == body.Method.This)
|
||
|
|
return 0;
|
||
|
|
if (body.Method.HasThis)
|
||
|
|
idx++;
|
||
|
|
|
||
|
|
return idx;
|
||
|
|
}
|
||
|
|
|
||
|
|
public override void VisitInstructionCollection (InstructionCollection instructions)
|
||
|
|
{
|
||
|
|
MethodBody body = instructions.Container;
|
||
|
|
long start = m_codeWriter.BaseStream.Position;
|
||
|
|
|
||
|
|
ComputeMaxStack (instructions);
|
||
|
|
|
||
|
|
foreach (Instruction instr in instructions) {
|
||
|
|
|
||
|
|
instr.Offset = (int) (m_codeWriter.BaseStream.Position - start);
|
||
|
|
|
||
|
|
if (instr.OpCode.Size == 1)
|
||
|
|
m_codeWriter.Write (instr.OpCode.Op2);
|
||
|
|
else {
|
||
|
|
m_codeWriter.Write (instr.OpCode.Op1);
|
||
|
|
m_codeWriter.Write (instr.OpCode.Op2);
|
||
|
|
}
|
||
|
|
|
||
|
|
if (instr.OpCode.OperandType != OperandType.InlineNone &&
|
||
|
|
instr.Operand == null)
|
||
|
|
throw new ReflectionException ("OpCode {0} have null operand", instr.OpCode.Name);
|
||
|
|
|
||
|
|
switch (instr.OpCode.OperandType) {
|
||
|
|
case OperandType.InlineNone :
|
||
|
|
break;
|
||
|
|
case OperandType.InlineSwitch :
|
||
|
|
Instruction [] targets = (Instruction []) instr.Operand;
|
||
|
|
for (int i = 0; i < targets.Length + 1; i++)
|
||
|
|
m_codeWriter.Write ((uint) 0);
|
||
|
|
break;
|
||
|
|
case OperandType.ShortInlineBrTarget :
|
||
|
|
m_codeWriter.Write ((byte) 0);
|
||
|
|
break;
|
||
|
|
case OperandType.InlineBrTarget :
|
||
|
|
m_codeWriter.Write (0);
|
||
|
|
break;
|
||
|
|
case OperandType.ShortInlineI :
|
||
|
|
if (instr.OpCode == OpCodes.Ldc_I4_S)
|
||
|
|
m_codeWriter.Write ((sbyte) instr.Operand);
|
||
|
|
else
|
||
|
|
m_codeWriter.Write ((byte) instr.Operand);
|
||
|
|
break;
|
||
|
|
case OperandType.ShortInlineVar :
|
||
|
|
m_codeWriter.Write ((byte) body.Variables.IndexOf (
|
||
|
|
(VariableDefinition) instr.Operand));
|
||
|
|
break;
|
||
|
|
case OperandType.ShortInlineParam :
|
||
|
|
m_codeWriter.Write ((byte) GetParameterIndex (body, (ParameterDefinition) instr.Operand));
|
||
|
|
break;
|
||
|
|
case OperandType.InlineSig :
|
||
|
|
WriteToken (GetCallSiteToken ((CallSite) instr.Operand));
|
||
|
|
break;
|
||
|
|
case OperandType.InlineI :
|
||
|
|
m_codeWriter.Write ((int) instr.Operand);
|
||
|
|
break;
|
||
|
|
case OperandType.InlineVar :
|
||
|
|
m_codeWriter.Write ((short) body.Variables.IndexOf (
|
||
|
|
(VariableDefinition) instr.Operand));
|
||
|
|
break;
|
||
|
|
case OperandType.InlineParam :
|
||
|
|
m_codeWriter.Write ((short) GetParameterIndex (
|
||
|
|
body, (ParameterDefinition) instr.Operand));
|
||
|
|
break;
|
||
|
|
case OperandType.InlineI8 :
|
||
|
|
m_codeWriter.Write ((long) instr.Operand);
|
||
|
|
break;
|
||
|
|
case OperandType.ShortInlineR :
|
||
|
|
m_codeWriter.Write ((float) instr.Operand);
|
||
|
|
break;
|
||
|
|
case OperandType.InlineR :
|
||
|
|
m_codeWriter.Write ((double) instr.Operand);
|
||
|
|
break;
|
||
|
|
case OperandType.InlineString :
|
||
|
|
WriteToken (new MetadataToken (TokenType.String,
|
||
|
|
m_reflectWriter.MetadataWriter.AddUserString (instr.Operand as string)));
|
||
|
|
break;
|
||
|
|
case OperandType.InlineField :
|
||
|
|
case OperandType.InlineMethod :
|
||
|
|
case OperandType.InlineType :
|
||
|
|
case OperandType.InlineTok :
|
||
|
|
if (instr.Operand is TypeReference)
|
||
|
|
WriteToken (GetTypeToken ((TypeReference) instr.Operand));
|
||
|
|
else if (instr.Operand is GenericInstanceMethod)
|
||
|
|
WriteToken (m_reflectWriter.GetMethodSpecToken (instr.Operand as GenericInstanceMethod));
|
||
|
|
else if (instr.Operand is MemberReference)
|
||
|
|
WriteToken (m_reflectWriter.GetMemberRefToken ((MemberReference) instr.Operand));
|
||
|
|
else if (instr.Operand is IMetadataTokenProvider)
|
||
|
|
WriteToken (((IMetadataTokenProvider) instr.Operand).MetadataToken);
|
||
|
|
else
|
||
|
|
throw new ReflectionException (
|
||
|
|
string.Format ("Wrong operand for {0} OpCode: {1}",
|
||
|
|
instr.OpCode.OperandType,
|
||
|
|
instr.Operand.GetType ().FullName));
|
||
|
|
break;
|
||
|
|
}
|
||
|
|
}
|
||
|
|
|
||
|
|
// patch branches
|
||
|
|
long pos = m_codeWriter.BaseStream.Position;
|
||
|
|
|
||
|
|
foreach (Instruction instr in instructions) {
|
||
|
|
switch (instr.OpCode.OperandType) {
|
||
|
|
case OperandType.InlineSwitch :
|
||
|
|
m_codeWriter.BaseStream.Position = instr.Offset + instr.OpCode.Size;
|
||
|
|
Instruction [] targets = (Instruction []) instr.Operand;
|
||
|
|
m_codeWriter.Write ((uint) targets.Length);
|
||
|
|
foreach (Instruction tgt in targets)
|
||
|
|
m_codeWriter.Write ((tgt.Offset - (instr.Offset +
|
||
|
|
instr.OpCode.Size + (4 * (targets.Length + 1)))));
|
||
|
|
break;
|
||
|
|
case OperandType.ShortInlineBrTarget :
|
||
|
|
m_codeWriter.BaseStream.Position = instr.Offset + instr.OpCode.Size;
|
||
|
|
m_codeWriter.Write ((byte) (((Instruction) instr.Operand).Offset -
|
||
|
|
(instr.Offset + instr.OpCode.Size + 1)));
|
||
|
|
break;
|
||
|
|
case OperandType.InlineBrTarget :
|
||
|
|
m_codeWriter.BaseStream.Position = instr.Offset + instr.OpCode.Size;
|
||
|
|
m_codeWriter.Write(((Instruction) instr.Operand).Offset -
|
||
|
|
(instr.Offset + instr.OpCode.Size + 4));
|
||
|
|
break;
|
||
|
|
}
|
||
|
|
}
|
||
|
|
|
||
|
|
m_codeWriter.BaseStream.Position = pos;
|
||
|
|
}
|
||
|
|
|
||
|
|
MetadataToken GetTypeToken (TypeReference type)
|
||
|
|
{
|
||
|
|
return m_reflectWriter.GetTypeDefOrRefToken (type);
|
||
|
|
}
|
||
|
|
|
||
|
|
MetadataToken GetCallSiteToken (CallSite cs)
|
||
|
|
{
|
||
|
|
uint sig;
|
||
|
|
int sentinel = cs.GetSentinel ();
|
||
|
|
if (sentinel > 0)
|
||
|
|
sig = m_reflectWriter.SignatureWriter.AddMethodDefSig (
|
||
|
|
m_reflectWriter.GetMethodDefSig (cs));
|
||
|
|
else
|
||
|
|
sig = m_reflectWriter.SignatureWriter.AddMethodRefSig (
|
||
|
|
m_reflectWriter.GetMethodRefSig (cs));
|
||
|
|
|
||
|
|
if (m_standaloneSigCache.Contains (sig))
|
||
|
|
return (MetadataToken) m_standaloneSigCache [sig];
|
||
|
|
|
||
|
|
StandAloneSigTable sasTable = m_reflectWriter.MetadataTableWriter.GetStandAloneSigTable ();
|
||
|
|
StandAloneSigRow sasRow = m_reflectWriter.MetadataRowWriter.CreateStandAloneSigRow (sig);
|
||
|
|
|
||
|
|
sasTable.Rows.Add(sasRow);
|
||
|
|
|
||
|
|
MetadataToken token = new MetadataToken (TokenType.Signature, (uint) sasTable.Rows.Count);
|
||
|
|
m_standaloneSigCache [sig] = token;
|
||
|
|
return token;
|
||
|
|
}
|
||
|
|
|
||
|
|
static int GetLength (Instruction start, Instruction end, InstructionCollection instructions)
|
||
|
|
{
|
||
|
|
Instruction last = instructions [instructions.Count - 1];
|
||
|
|
return (end == instructions.Outside ? last.Offset + last.GetSize () : end.Offset) - start.Offset;
|
||
|
|
}
|
||
|
|
|
||
|
|
static bool IsRangeFat (Instruction start, Instruction end, InstructionCollection instructions)
|
||
|
|
{
|
||
|
|
return GetLength (start, end, instructions) >= 256 ||
|
||
|
|
start.Offset >= 65536;
|
||
|
|
}
|
||
|
|
|
||
|
|
static bool IsFat (ExceptionHandlerCollection seh)
|
||
|
|
{
|
||
|
|
for (int i = 0; i < seh.Count; i++) {
|
||
|
|
ExceptionHandler eh = seh [i];
|
||
|
|
if (IsRangeFat (eh.TryStart, eh.TryEnd, seh.Container.Instructions))
|
||
|
|
return true;
|
||
|
|
|
||
|
|
if (IsRangeFat (eh.HandlerStart, eh.HandlerEnd, seh.Container.Instructions))
|
||
|
|
return true;
|
||
|
|
|
||
|
|
switch (eh.Type) {
|
||
|
|
case ExceptionHandlerType.Filter :
|
||
|
|
if (IsRangeFat (eh.FilterStart, eh.FilterEnd, seh.Container.Instructions))
|
||
|
|
return true;
|
||
|
|
break;
|
||
|
|
}
|
||
|
|
}
|
||
|
|
|
||
|
|
return false;
|
||
|
|
}
|
||
|
|
|
||
|
|
void WriteExceptionHandlerCollection (ExceptionHandlerCollection seh)
|
||
|
|
{
|
||
|
|
m_codeWriter.QuadAlign ();
|
||
|
|
|
||
|
|
if (seh.Count < 0x15 && !IsFat (seh)) {
|
||
|
|
m_codeWriter.Write ((byte) MethodDataSection.EHTable);
|
||
|
|
m_codeWriter.Write ((byte) (seh.Count * 12 + 4));
|
||
|
|
m_codeWriter.Write (new byte [2]);
|
||
|
|
foreach (ExceptionHandler eh in seh) {
|
||
|
|
m_codeWriter.Write ((ushort) eh.Type);
|
||
|
|
m_codeWriter.Write ((ushort) eh.TryStart.Offset);
|
||
|
|
m_codeWriter.Write ((byte) (eh.TryEnd.Offset - eh.TryStart.Offset));
|
||
|
|
m_codeWriter.Write ((ushort) eh.HandlerStart.Offset);
|
||
|
|
m_codeWriter.Write ((byte) GetLength (eh.HandlerStart, eh.HandlerEnd, seh.Container.Instructions));
|
||
|
|
WriteHandlerSpecific (eh);
|
||
|
|
}
|
||
|
|
} else {
|
||
|
|
m_codeWriter.Write ((byte) (MethodDataSection.FatFormat | MethodDataSection.EHTable));
|
||
|
|
WriteFatBlockSize (seh);
|
||
|
|
foreach (ExceptionHandler eh in seh) {
|
||
|
|
m_codeWriter.Write ((uint) eh.Type);
|
||
|
|
m_codeWriter.Write ((uint) eh.TryStart.Offset);
|
||
|
|
m_codeWriter.Write ((uint) (eh.TryEnd.Offset - eh.TryStart.Offset));
|
||
|
|
m_codeWriter.Write ((uint) eh.HandlerStart.Offset);
|
||
|
|
m_codeWriter.Write ((uint) GetLength (eh.HandlerStart, eh.HandlerEnd, seh.Container.Instructions));
|
||
|
|
WriteHandlerSpecific (eh);
|
||
|
|
}
|
||
|
|
}
|
||
|
|
}
|
||
|
|
|
||
|
|
void WriteFatBlockSize (ExceptionHandlerCollection seh)
|
||
|
|
{
|
||
|
|
int size = seh.Count * 24 + 4;
|
||
|
|
m_codeWriter.Write ((byte) (size & 0xff));
|
||
|
|
m_codeWriter.Write ((byte) ((size >> 8) & 0xff));
|
||
|
|
m_codeWriter.Write ((byte) ((size >> 16) & 0xff));
|
||
|
|
}
|
||
|
|
|
||
|
|
void WriteHandlerSpecific (ExceptionHandler eh)
|
||
|
|
{
|
||
|
|
switch (eh.Type) {
|
||
|
|
case ExceptionHandlerType.Catch :
|
||
|
|
WriteToken (GetTypeToken (eh.CatchType));
|
||
|
|
break;
|
||
|
|
case ExceptionHandlerType.Filter :
|
||
|
|
m_codeWriter.Write ((uint) eh.FilterStart.Offset);
|
||
|
|
break;
|
||
|
|
default :
|
||
|
|
m_codeWriter.Write (0);
|
||
|
|
break;
|
||
|
|
}
|
||
|
|
}
|
||
|
|
|
||
|
|
public override void VisitVariableDefinitionCollection (VariableDefinitionCollection variables)
|
||
|
|
{
|
||
|
|
MethodBody body = variables.Container as MethodBody;
|
||
|
|
if (body == null || stripped)
|
||
|
|
return;
|
||
|
|
|
||
|
|
uint sig = m_reflectWriter.SignatureWriter.AddLocalVarSig (
|
||
|
|
GetLocalVarSig (variables));
|
||
|
|
|
||
|
|
if (m_localSigCache.Contains (sig)) {
|
||
|
|
body.LocalVarToken = (int) m_localSigCache [sig];
|
||
|
|
return;
|
||
|
|
}
|
||
|
|
|
||
|
|
StandAloneSigTable sasTable = m_reflectWriter.MetadataTableWriter.GetStandAloneSigTable ();
|
||
|
|
StandAloneSigRow sasRow = m_reflectWriter.MetadataRowWriter.CreateStandAloneSigRow (
|
||
|
|
sig);
|
||
|
|
|
||
|
|
sasTable.Rows.Add (sasRow);
|
||
|
|
body.LocalVarToken = sasTable.Rows.Count;
|
||
|
|
m_localSigCache [sig] = body.LocalVarToken;
|
||
|
|
}
|
||
|
|
|
||
|
|
public override void TerminateMethodBody (MethodBody body)
|
||
|
|
{
|
||
|
|
long pos = m_binaryWriter.BaseStream.Position;
|
||
|
|
|
||
|
|
if (body.HasVariables || body.HasExceptionHandlers
|
||
|
|
|| m_codeWriter.BaseStream.Length >= 64 || body.MaxStack > 8) {
|
||
|
|
|
||
|
|
MethodHeader header = MethodHeader.FatFormat;
|
||
|
|
if (body.InitLocals)
|
||
|
|
header |= MethodHeader.InitLocals;
|
||
|
|
if (body.HasExceptionHandlers)
|
||
|
|
header |= MethodHeader.MoreSects;
|
||
|
|
|
||
|
|
m_binaryWriter.Write ((byte) header);
|
||
|
|
m_binaryWriter.Write ((byte) 0x30); // (header size / 4) << 4
|
||
|
|
m_binaryWriter.Write ((short) body.MaxStack);
|
||
|
|
m_binaryWriter.Write ((int) m_codeWriter.BaseStream.Length);
|
||
|
|
// the token should be zero if there are no variables
|
||
|
|
int token = body.HasVariables ? ((int) TokenType.Signature | body.LocalVarToken) : 0;
|
||
|
|
m_binaryWriter.Write (token);
|
||
|
|
|
||
|
|
if (body.HasExceptionHandlers)
|
||
|
|
WriteExceptionHandlerCollection (body.ExceptionHandlers);
|
||
|
|
} else
|
||
|
|
m_binaryWriter.Write ((byte) ((byte) MethodHeader.TinyFormat |
|
||
|
|
m_codeWriter.BaseStream.Length << 2));
|
||
|
|
|
||
|
|
m_binaryWriter.Write (m_codeWriter);
|
||
|
|
m_binaryWriter.QuadAlign ();
|
||
|
|
|
||
|
|
m_reflectWriter.MetadataWriter.AddData (
|
||
|
|
(int) (m_binaryWriter.BaseStream.Position - pos));
|
||
|
|
}
|
||
|
|
|
||
|
|
public LocalVarSig.LocalVariable GetLocalVariableSig (VariableDefinition var)
|
||
|
|
{
|
||
|
|
LocalVarSig.LocalVariable lv = new LocalVarSig.LocalVariable ();
|
||
|
|
TypeReference type = var.VariableType;
|
||
|
|
|
||
|
|
lv.CustomMods = m_reflectWriter.GetCustomMods (type);
|
||
|
|
|
||
|
|
if (type is PinnedType) {
|
||
|
|
lv.Constraint |= Constraint.Pinned;
|
||
|
|
type = (type as PinnedType).ElementType;
|
||
|
|
}
|
||
|
|
|
||
|
|
if (type is ReferenceType) {
|
||
|
|
lv.ByRef = true;
|
||
|
|
type = (type as ReferenceType).ElementType;
|
||
|
|
}
|
||
|
|
|
||
|
|
lv.Type = m_reflectWriter.GetSigType (type);
|
||
|
|
|
||
|
|
return lv;
|
||
|
|
}
|
||
|
|
|
||
|
|
public LocalVarSig GetLocalVarSig (VariableDefinitionCollection vars)
|
||
|
|
{
|
||
|
|
LocalVarSig lvs = new LocalVarSig ();
|
||
|
|
lvs.CallingConvention |= 0x7;
|
||
|
|
lvs.Count = vars.Count;
|
||
|
|
lvs.LocalVariables = new LocalVarSig.LocalVariable [lvs.Count];
|
||
|
|
for (int i = 0; i < lvs.Count; i++) {
|
||
|
|
lvs.LocalVariables [i] = GetLocalVariableSig (vars [i]);
|
||
|
|
}
|
||
|
|
|
||
|
|
return lvs;
|
||
|
|
}
|
||
|
|
|
||
|
|
void ComputeMaxStack (InstructionCollection instructions)
|
||
|
|
{
|
||
|
|
int current = 0;
|
||
|
|
int max = 0;
|
||
|
|
m_stackSizes.Clear ();
|
||
|
|
|
||
|
|
foreach (ExceptionHandler eh in instructions.Container.ExceptionHandlers) {
|
||
|
|
switch (eh.Type) {
|
||
|
|
case ExceptionHandlerType.Catch :
|
||
|
|
case ExceptionHandlerType.Filter :
|
||
|
|
m_stackSizes [eh.HandlerStart] = 1;
|
||
|
|
max = 1;
|
||
|
|
break;
|
||
|
|
}
|
||
|
|
}
|
||
|
|
|
||
|
|
foreach (Instruction instr in instructions) {
|
||
|
|
|
||
|
|
object savedSize = m_stackSizes [instr];
|
||
|
|
if (savedSize != null)
|
||
|
|
current = (int) savedSize;
|
||
|
|
|
||
|
|
current -= GetPopDelta (instructions.Container.Method, instr, current);
|
||
|
|
|
||
|
|
if (current < 0)
|
||
|
|
current = 0;
|
||
|
|
|
||
|
|
current += GetPushDelta (instr);
|
||
|
|
|
||
|
|
if (current > max)
|
||
|
|
max = current;
|
||
|
|
|
||
|
|
// for forward branches, copy the stack size for the instruction that is being branched to
|
||
|
|
switch (instr.OpCode.OperandType) {
|
||
|
|
case OperandType.InlineBrTarget:
|
||
|
|
case OperandType.ShortInlineBrTarget:
|
||
|
|
m_stackSizes [instr.Operand] = current;
|
||
|
|
break;
|
||
|
|
case OperandType.InlineSwitch:
|
||
|
|
foreach (Instruction target in (Instruction []) instr.Operand)
|
||
|
|
m_stackSizes [target] = current;
|
||
|
|
break;
|
||
|
|
}
|
||
|
|
|
||
|
|
switch (instr.OpCode.FlowControl) {
|
||
|
|
case FlowControl.Branch:
|
||
|
|
case FlowControl.Throw:
|
||
|
|
case FlowControl.Return:
|
||
|
|
// next statement is not reachable from this statement, so reset the stack depth to 0
|
||
|
|
current = 0;
|
||
|
|
break;
|
||
|
|
}
|
||
|
|
}
|
||
|
|
|
||
|
|
instructions.Container.MaxStack = max + 1; // you never know
|
||
|
|
}
|
||
|
|
|
||
|
|
static int GetPushDelta (Instruction instruction)
|
||
|
|
{
|
||
|
|
OpCode code = instruction.OpCode;
|
||
|
|
switch (code.StackBehaviourPush) {
|
||
|
|
case StackBehaviour.Push0:
|
||
|
|
return 0;
|
||
|
|
|
||
|
|
case StackBehaviour.Push1:
|
||
|
|
case StackBehaviour.Pushi:
|
||
|
|
case StackBehaviour.Pushi8:
|
||
|
|
case StackBehaviour.Pushr4:
|
||
|
|
case StackBehaviour.Pushr8:
|
||
|
|
case StackBehaviour.Pushref:
|
||
|
|
return 1;
|
||
|
|
|
||
|
|
case StackBehaviour.Push1_push1:
|
||
|
|
return 2;
|
||
|
|
|
||
|
|
case StackBehaviour.Varpush:
|
||
|
|
if (code.FlowControl != FlowControl.Call)
|
||
|
|
break;
|
||
|
|
|
||
|
|
IMethodSignature method = (IMethodSignature) instruction.Operand;
|
||
|
|
return IsVoid (method.ReturnType.ReturnType) ? 0 : 1;
|
||
|
|
}
|
||
|
|
|
||
|
|
throw new NotSupportedException ();
|
||
|
|
}
|
||
|
|
|
||
|
|
static int GetPopDelta (MethodDefinition current, Instruction instruction, int height)
|
||
|
|
{
|
||
|
|
OpCode code = instruction.OpCode;
|
||
|
|
switch (code.StackBehaviourPop) {
|
||
|
|
case StackBehaviour.Pop0:
|
||
|
|
return 0;
|
||
|
|
case StackBehaviour.Popi:
|
||
|
|
case StackBehaviour.Popref:
|
||
|
|
case StackBehaviour.Pop1:
|
||
|
|
return 1;
|
||
|
|
|
||
|
|
case StackBehaviour.Pop1_pop1:
|
||
|
|
case StackBehaviour.Popi_pop1:
|
||
|
|
case StackBehaviour.Popi_popi:
|
||
|
|
case StackBehaviour.Popi_popi8:
|
||
|
|
case StackBehaviour.Popi_popr4:
|
||
|
|
case StackBehaviour.Popi_popr8:
|
||
|
|
case StackBehaviour.Popref_pop1:
|
||
|
|
case StackBehaviour.Popref_popi:
|
||
|
|
return 2;
|
||
|
|
|
||
|
|
case StackBehaviour.Popi_popi_popi:
|
||
|
|
case StackBehaviour.Popref_popi_popi:
|
||
|
|
case StackBehaviour.Popref_popi_popi8:
|
||
|
|
case StackBehaviour.Popref_popi_popr4:
|
||
|
|
case StackBehaviour.Popref_popi_popr8:
|
||
|
|
case StackBehaviour.Popref_popi_popref:
|
||
|
|
return 3;
|
||
|
|
|
||
|
|
case StackBehaviour.PopAll:
|
||
|
|
return height;
|
||
|
|
|
||
|
|
case StackBehaviour.Varpop:
|
||
|
|
if (code == OpCodes.Ret)
|
||
|
|
return IsVoid (current.ReturnType.ReturnType) ? 0 : 1;
|
||
|
|
|
||
|
|
if (code.FlowControl != FlowControl.Call)
|
||
|
|
break;
|
||
|
|
|
||
|
|
IMethodSignature method = (IMethodSignature) instruction.Operand;
|
||
|
|
int count = method.HasParameters ? method.Parameters.Count : 0;
|
||
|
|
if (method.HasThis && code != OpCodes.Newobj)
|
||
|
|
++count;
|
||
|
|
|
||
|
|
return count;
|
||
|
|
}
|
||
|
|
|
||
|
|
throw new NotSupportedException ();
|
||
|
|
}
|
||
|
|
|
||
|
|
static bool IsVoid (TypeReference type)
|
||
|
|
{
|
||
|
|
return type.FullName == Constants.Void;
|
||
|
|
}
|
||
|
|
}
|
||
|
|
}
|