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TODO
====
Essential
---------
* SSA is broken by simplify_loads() & branches rewriting/simplification
* attributes of struct, union & enums are ignored (and possibly in other
cases too).
* add support for bitwise enums
Documentation
-------------
* document the extensions
* document the API
* document the limitations of modifying ptrlists during list walking
* document the data structures
* document flow of data / architecture / code structure
Core
----
* if a variable has its address taken but in an unreachable BB then
its MOD_ADDRESSABLE may be wrong and it won't be SSA converted.
- let kill_insn() check killing of SYMADDR,
- add the sym into a list and
- recalculate the addressability before memops's SSA conversion
* bool_ctype should be split into internal 1-bit / external 8-bit
Testsuite
---------
* there are more than 50 failing tests. They should be fixed
(but most are non-trivial to fix).
Misc
----
* GCC's -Wenum-compare / clangs's -Wenum-conversion -Wassign-enum
* parse __attribute_((fallthrough))
* add support for format(printf()) (WIP by Ben Dooks)
* make use of UNDEFs (issues warnings, simplification, ... ?)
* add a pass to inline small functions during simplification.
Optimization
------------
* the current way of doing CSE uses a lot of time
* add SSA based DCE
* add SSA based PRE
* Add SSA based SCCP
* use better/more systematic use of internal verification framework
IR
--
* OP_SET should return a bool, always
* add IR instructions for va_arg() & friends
* add a possibility to import of file in "IR assembly"
* dump the symtable
* dump the CFG
LLVM
----
* fix ...
Internal backends
-----------------
* add some basic register allocation
* add a pass to transform 3-addresses code to 2-addresses
* what can be done for x86?
Longer term/to investigate
--------------------------
* better architecture handling than current machine.h + target.c
* attributes are represented as ctypes's alignment, modifiers & contexts
but plenty of attributes doesn't fit, for example they need arguments.
* format(printf, ...),
* section("...")
* assume_aligned(alignment[, offsert])
* error("message"), warning("message")
* ...
* should support "-Werror=..." ?
* All warning messages should include the option how to disable it.
For example:
"warning: Variable length array is used."
should be something like:
"warning: Variable length array is used. (-Wno-vla)"
* ptrlists must not have elements removed while being iterated;
this should somehow be enforced.
* having 'struct symbol' used to represent symbols *and* types is
quite handy but it also creates lots of problems and complications
* Possible mixup of symbol for a function designator being not a pointer?
This seems to make evaluation of function pointers much more complex
than needed.
* extend test-inspect to inspect more AST fields.
* extend test-inspect to inspect instructions.
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