linux-packaging-mono/docs/ir-desc

Mono Intermediate Representation Documentation

Operation: OP_ADDCC_IMM

	Add immediate that will set the carry flag.  

	dreg:
		Destination register
	inst_imm
		Immediate value to add.
	sreg1:
		Source register to add.

Operation: OP_CALL_HANDLER.

	cil_code: 
		Points to the CIL where the LEAVE or LEAVE_S
		instruction was found.

	inst_target_bb:
		The target basic block for this invocation.

	This instruction must call the target basic block.
	
Operation: OP_CISINST

	Implements the CEE_MONO_CISINST opcode that is decoded from
	the CIL stream.

	This opcode takes as input an object reference and a class,
	and leaves on the assigned register:

		0. if the object is an instance of the class,
		1. if the object is not instance of the class,
		2. if the object is a proxy whose type cannot be determined.

Operation: OP_CCASTCLASS

	Implements the CEE_MONO_CCASTCLASS opcode that is decoded from
	the CIL stream.

	This opcode takes as input an object reference and a class,
	and leaves on the assigned register:

		0. if the object is an instance of the class,
		1. if the object is a proxy whose type cannot be determined

		throws an InvalidCastException exception otherwise.

Operation: OP_LOCALLOC
	inst_left:
		The value 
                                ins->inst_left = *sp;
                                ins->cil_code = ip;

	This is the equivalent of alloca() in a C implementation: it
	allocates a bunch of bytes on the stack dynamically. Local
	variables are allocated statically in the stack instead.
	
	It is implemented by moving the stack pointer according to the
	platform ABI: you may need to keep a specific frame register
	to address local variables when LOCALLOC is used (the PPC code
	does this, for example: ifyou're doing the s390 port I suggest
	starting from that)

Operation: OP_SUBCC_IMM

	Substract immediate that will set the borrow flag.

	dreg:
		Destination register
	inst_imm
		Immediate value to add.
	sreg1:
		Source register to add.