private int GetStackDepthBeforeCall()
{
// We often see crashes on this statement due to flaws earlier in
// the Reko process. The register state is cleared when this analysis
// encounters a procedure that terminates/diverges. The most common
// cause for this is encountering invalid instructions from the
// architecture rewriter. If you see an exception here, look for
// unimplemented machine instruction rewriters for the relevant
// architecture.
var spVal = ctx.RegisterState[platform.Architecture.StackRegister];
if (ctx.IsFramePointer(spVal))
{
return(0);
}
if (!(spVal is BinaryExpression bin && ctx.IsFramePointer(bin.Left)))
{
return(0);
}
if (!(bin.Right is Constant c))
{
throw new NotImplementedException("Expected stack depth to be known.");
}
int depth = c.ToInt32();
if (bin.Operator == Operator.ISub)
{
depth = -depth;
}
return(-depth);
}
private int GetStackDepthBeforeCall()
{
var spVal = ctx.RegisterState[arch.StackRegister];
if (ctx.IsFramePointer(spVal))
{
return(0);
}
var bin = spVal as BinaryExpression;
if (bin == null || !ctx.IsFramePointer(bin.Left))
{
return(0);
}
var c = bin.Right as Constant;
if (c == null)
{
throw new NotImplementedException("Expected stack depth to be known.");
}
int depth = c.ToInt32();
if (bin.Operator == Operator.ISub)
{
depth = -depth;
}
if (depth > 0)
{
throw new NotImplementedException("Expected stack depth to be negative.");
}
return(-depth);
}