Class Opcode

constructor for the basic Envi Opcode object.  Arguments as follows:

opcode   - An architecture specific numerical value for the opcode
mnem     - A humon readable mnemonic for the opcode
prefixes - a bitmask of architecture specific instruction prefixes
size     - The size of the opcode in bytes
operands - A list of Operand objects for this opcode
iflags   - A list of Envi (architecture independant) instruction flags (see IF_FOO)
va       - The virtual address the instruction lives at (used for PC relative immediates etc...)

NOTE: If you want to create an architecture spcific opcode, I'd *highly* recommend you
      just copy/paste in the following simple initial code rather than calling the parent
      constructor.  The extra

Return a list of tuples. Each tuple contains the target VA of the branch, and a possible set of flags showing what type of branch it is.

See the BR_FOO types for all the supported envi branch flags.... Example: for bva,bflags in op.getBranches():

Render this opcode to the memory canvas passed in. This is used for both simple printing AND more complex representations.