[bug-epsilon] [task #3379] Rewrite the eAM from scratch

[Luca Saiu]

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 of the project: epsilon.




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[task #3379] Full Item Snapshot:

URL: <http://savannah.gnu.org/task/?func=detailitem&item_id=3379>
Project: epsilon
Submitted by: Luca Saiu
On: Mon 08/09/2004 at 01:20

Category:  eAM (except target code generation and GC)
Should Start On:  Mon 08/09/2004 at 00:00
Should be Finished on:  Mon 08/09/2004 at 00:00
Priority:  3 - Low
Resolution:  None
Assigned to:  None
Percent Complete:  0%
Status:  Open
Effort:  0.00


Summary:  Rewrite the eAM from scratch

Original Submission:  When the meta-compiler is ready it should generate code 
for a register-based machine. There's no point in writing a hack to support the 
current eAM, which has stack-only call conventions.
This would be also the right time to make the eAM instruction set more 
consistent.

Current ideas:
* instructions with register operands.
* explicit load and store, push and pop.
* more readable opcodes. There's no point in making eAML seem assembly.
* high-level but uniform syntax such as R1 := + R2 R3. All operators should be 
prefix.
* register-based calling conventions for native and non-native subprograms. 
* support for mixed compiled(/bytecode?)/interpreted programs. In particular 
Non-native calls should be compatible with native calls.
* O(1) throw/catch? If we can gain some speed it can be easily made using a 
separate stack for each defined exception.
* object names and function definitions should be visible at eAM level, so that 
functions are easily serializable.
* cleaner and simpler support for C libraries. Many primitive functions should 
be implemented in C libraries.

To do: rethink the whole C-generation architecture. It must be made faster. I 
think we should minimize code-size. Also, separate compilation of generated C 
files is an issue, since generated C files will however tend to be big if we 
translate from eAMX to C.











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