| public GetOperand ( int index ) : Operand | ||
| index | int | The index. |
| return | Operand | |
/// <summary>
/// Performs stage specific processing on the compiler context.
/// </summary>
void IMethodCompilerStage.Run()
{
if (AreExceptions)
return;
foreach (var block in this.basicBlocks)
{
if (block.Label == Int32.MaxValue)
continue;
for (var context = new Context(this.instructionSet, block); !context.EndOfInstruction; context.GotoNext())
{
if (context.Instruction is PhiInstruction)
this.ProcessPhiInstruction(block, context);
for (var i = 0; i < context.OperandCount; ++i)
{
var op = context.GetOperand(i);
if (op is SsaOperand)
context.SetOperand(i, (op as SsaOperand).Operand);
}
for (var i = 0; i < context.ResultCount; ++i)
{
var op = context.GetResult(i);
if (op is SsaOperand)
context.SetResult(i, (op as SsaOperand).Operand);
}
}
}
}
/// <summary>
/// Replaces the intrinsic call site
/// </summary>
/// <param name="context">The context.</param>
/// <param name="typeSystem">The type system.</param>
void IIntrinsicPlatformMethod.ReplaceIntrinsicCall(Context context, BaseMethodCompiler methodCompiler)
{
Operand v0 = context.Operand1;
Operand v1 = context.Operand2;
Operand v2 = context.Operand3;
Operand v3 = context.GetOperand(3);
Operand esp = Operand.CreateCPURegister(methodCompiler.TypeSystem.BuiltIn.I4, GeneralPurposeRegister.ESP);
Operand ebp = Operand.CreateCPURegister(methodCompiler.TypeSystem.BuiltIn.I4, GeneralPurposeRegister.EBP);
Operand eax = Operand.CreateCPURegister(methodCompiler.TypeSystem.BuiltIn.I4, GeneralPurposeRegister.EAX);
Operand ebx = Operand.CreateCPURegister(methodCompiler.TypeSystem.BuiltIn.I4, GeneralPurposeRegister.EBX);
Operand ecx = Operand.CreateCPURegister(methodCompiler.TypeSystem.BuiltIn.I4, GeneralPurposeRegister.ECX);
Operand exceptionRegister = Operand.CreateCPURegister(methodCompiler.TypeSystem.BuiltIn.Object, methodCompiler.Architecture.ExceptionRegister);
// Move all virtual registers into physical registers - necessary since stack frame pointer will change
context.SetInstruction(X86.Mov, eax, v0);
context.AppendInstruction(X86.Mov, ebx, v1);
context.AppendInstruction(X86.Mov, ecx, v2);
context.AppendInstruction(X86.Mov, exceptionRegister, v3);
// Update the frame and stack registers
context.AppendInstruction(X86.Mov, ebp, ecx);
context.AppendInstruction(X86.Mov, esp, ebx);
context.AppendInstruction(X86.Jmp, null, eax);
// future - common code (refactor opportunity)
context.GotoNext();
// Remove all remaining instructions in block and clear next block list
while (!context.IsBlockEndInstruction)
{
if (!context.IsEmpty)
{
context.SetInstruction(X86.Nop);
}
context.GotoNext();
}
var nextBlocks = context.Block.NextBlocks;
foreach (var next in nextBlocks)
{
next.PreviousBlocks.Remove(context.Block);
}
nextBlocks.Clear();
}
/// <summary>
/// Returns a <see cref="System.String"/> that represents this instance.
/// </summary>
/// <param name="context">The context.</param>
/// <returns>
/// A <see cref="System.String"/> that represents this instance.
/// </returns>
public virtual string ToString(Context context)
{
StringBuilder s = new StringBuilder(ToString());
if (context.Other is IR.ConditionCode)
{
s.Append(" [");
s.Append(GetConditionString(context.ConditionCode));
s.Append("]");
}
string mod = GetModifier(context);
if (mod != null)
{
s.Append(" [");
s.Append(mod);
s.Append("]");
}
if (context.ResultCount != 0)
{
s.Append(" ");
s.Append(context.Result);
}
if (context.ResultCount > 0 && context.OperandCount > 0)
{
s.Append(" <-");
}
for (int i = 0; (i < 3) && (i < context.OperandCount); i++)
{
s.Append(" ");
s.Append(context.GetOperand(i));
s.Append(",");
}
if (context.OperandCount > 3)
{
s.Append(" [more]");
}
else if (context.OperandCount > 0)
{
s.Length = s.Length - 1;
}
if (context.BranchTargets != null)
{
for (int i = 0; (i < 2) && (i < context.BranchTargets.Length); i++)
{
s.Append(String.Format(@" L_{0:X4},", context.BranchTargets[i]));
}
if (context.BranchTargets.Length > 2)
{
s.Append(" [more]");
}
else if (context.BranchTargets.Length > 0)
{
s.Length = s.Length - 1;
}
}
if (context.InvokeTarget != null)
{
s.Append(" {");
s.Append(context.InvokeTarget.ToString());
s.Append("}");
}
if (context.RuntimeField != null)
{
s.Append(" {");
s.Append(context.RuntimeField.ToString());
s.Append("}");
}
return s.ToString();
}
/// <summary>
///
/// </summary>
/// <param name="block"></param>
private void RenameVariables(BasicBlock block)
{
for (var context = new Context(this.instructionSet, block); !context.EndOfInstruction; context.GotoNext())
{
if (!(context.Instruction is PhiInstruction))
{
for (var i = 0; i < context.OperandCount; ++i)
{
var op = context.GetOperand(i);
if (!(op is StackOperand))
continue;
var name = NameForOperand(context.GetOperand(i));
if (!this.variableInformation.ContainsKey(name))
throw new Exception(name + " is not in dictionary [block = " + block + "]");
var index = this.variableInformation[name].Stack.Peek();
context.SetOperand(i, new SsaOperand(context.GetOperand(i), index));
}
}
if (PhiPlacementStage.IsAssignmentToStackVariable(context))
{
var name = NameForOperand(context.Result);
var index = this.variableInformation[name].Count;
context.SetResult(new SsaOperand(context.Result, index));
this.variableInformation[name].Stack.Push(index);
++this.variableInformation[name].Count;
}
}
foreach (var s in block.NextBlocks)
{
var j = this.WhichPredecessor(s, block);
for (var context = new Context(this.instructionSet, s); !context.EndOfInstruction; context.GotoNext())
{
if (!(context.Instruction is PhiInstruction))
continue;
var name = NameForOperand(context.GetOperand(j));
if (this.variableInformation[name].Stack.Count > 0)
{
var index = this.variableInformation[name].Stack.Peek();
context.SetOperand(j, new SsaOperand(context.GetOperand(j), index));
}
}
}
foreach (var s in this.dominanceCalculationStage.GetChildren(block))
{
this.RenameVariables(s);
}
for (var context = new Context(this.instructionSet, block); !context.EndOfInstruction; context.GotoNext())
{
if (PhiPlacementStage.IsAssignmentToStackVariable(context))
{
var instName = context.Label + "." + context.Index;
var op = this.oldLefHandSide[instName];
var name = NameForOperand(op);
this.variableInformation[name].Stack.Pop();
}
}
}
/// <summary>
/// Returns a <see cref="System.String"/> that represents this instance.
/// </summary>
/// <param name="context">The context.</param>
/// <returns>
/// A <see cref="System.String"/> that represents this instance.
/// </returns>
public virtual string ToString(Context context)
{
StringBuilder s = new StringBuilder(ToString());
if (context.ConditionCode != ConditionCode.Undefined)
{
s.Append(" [");
s.Append(GetConditionString(context.ConditionCode));
s.Append("]");
}
if (context.MosaType != null)
{
s.Append(" [");
s.Append(context.MosaType.FullName);
s.Append("]");
}
if (context.MosaField != null)
{
s.Append(" [");
s.Append(context.MosaField.FullName);
s.Append("]");
}
string mod = GetModifier(context);
if (mod != null)
{
s.Append(" [");
s.Append(mod);
s.Append("]");
}
if (context.ResultCount != 0)
{
s.Append(" ");
s.Append(context.Result);
if (context.ResultCount == 2)
{
s.Append(" : ");
s.Append(context.Result2);
}
}
if (context.ResultCount > 0 && context.OperandCount > 0)
{
s.Append(" <=");
}
for (int i = 0; i < context.OperandCount; i++)
{
s.Append(" ");
s.Append(context.GetOperand(i));
s.Append(",");
}
if (context.OperandCount > 0)
{
s.Length = s.Length - 1;
}
if (context.BranchTargets != null)
{
for (int i = 0; (i < 2) && (i < context.BranchTargets.Length); i++)
{
s.Append(String.Format(@" L_{0:X4},", context.BranchTargets[i]));
}
if (context.BranchTargets.Length > 2)
{
s.Append(" [more]");
}
else if (context.BranchTargets.Length > 0)
{
s.Length = s.Length - 1;
}
}
if (context.MosaMethod != null)
{
s.Append(" {");
s.Append(context.MosaMethod.FullName);
s.Append("}");
}
if (context.MosaField != null)
{
s.Append(" {");
s.Append(context.MosaField.FullName);
s.Append("}");
}
return s.ToString();
}
/// <summary>
/// Assigns the operands from CIL stack.
/// </summary>
/// <param name="ctx">The context.</param>
/// <param name="currentStack">The current stack.</param>
private void AssignOperandsFromCILStack(Context ctx, Stack<Operand> currentStack)
{
for (int index = ctx.OperandCount - 1; index >= 0; --index)
{
if (ctx.GetOperand(index) != null)
continue;
ctx.SetOperand(index, currentStack.Pop());
}
}
/// <summary>
/// Pops the operands of an instruction from the evaluation stack.
/// </summary>
/// <param name="ctx">The context.</param>
/// <returns>The number of operands popped.</returns>
private int PopOperands(Context ctx)
{
for (int i = ctx.OperandCount - 1; i > -1; i--)
{
Operand op = ctx.GetOperand(i);
Operand evalOp = evaluationStack.Pop();
Debug.Assert(ReferenceEquals(evalOp, op), @"Operand's are not equal?");
}
return ctx.OperandCount;
}
/// <summary>
/// Processes the phi instruction.
/// </summary>
/// <param name="block">The block.</param>
/// <param name="context">The context.</param>
private void ProcessPhiInstruction(BasicBlock block, Context context)
{
for (var predecessorIndex = 0; predecessorIndex < block.PreviousBlocks.Count; ++predecessorIndex)
{
var predecessor = block.PreviousBlocks[predecessorIndex];
var operand = context.GetOperand(predecessorIndex);
this.InsertCopyStatement(predecessor, context.Result, operand);
}
context.Remove();
}
