The Cursor navigation methods all just depend on the cursor's position
and layout reference. Make a CursorBase trait that provides access to
this information with methods and implement the navigation methods on
top of that.
This makes it possible to have multiple types implement the cursor
interface.
Register locations can change throughout an EBB. Make sure the
emit_inst() function considers this when encoding instructions and
update the register diversion tracker.
This function will emit the binary machine code into contiguous raw
memory while sending relocations to a RelocSink.
Add a MemoryCodeSink for generating machine code directly into memory
efficiently. Allow the TargetIsa to provide emit_function
implementations that are specialized to the MemoryCodeSink type to avoid
needless small virtual callbacks to put1() et etc.
This is the main entry point to the code generator. It returns the
computed size of the functions code.
Also add a 'test compile' command which runs the whole code generation
pipeline.
Compute exact EBB header offsets and check that branches are in range.
Not implemented yet: Relax branches that are not in range.
Invoke the relax_branches() pass from the 'test binemit' file tests so
they can verify the proper encoding of branch instructions too.
Not all br_icmp opcodes are present in the ISA. The missing ones can be
reached by commuting operands.
Don't attempt to encode EBB offsets yet. For now just emit an EBB
relocation for the branch instruction.
Use the meta language encoding recipes to generate an emit_inst()
function for each ISA. The generated calls into recipe_*() functions
that must be implemented by hand.
Implement recipe_*() functions for the RISC-V recipes.
Add the TargetIsa::emit_inst() entry point which emits an instruction to
a CodeSink trait object.
