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A start on converting the mainloop.

This commit is contained in:
Simon Forman 2019-11-07 15:53:07 -08:00
parent b924350c6d
commit 0ce64f2ec4
1 changed files with 30 additions and 3 deletions
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33
thun/compiler.markII.pl
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@ -17,6 +17,8 @@ GNU General Public License for more details.
You should have received a copy of the GNU General Public License
along with Thun. If not see <http://www.gnu.org/licenses/>.
The Joy interpreter that this implements is pretty crude. the only types
are 16-bit integers and linked lists. The lists are 32-bit words divided
into two 16-bit fields. The high half is the node value and the low half
@ -62,6 +64,7 @@ compile_program(Program, Binary) :-
phrase((init, ⦾(Program, IR)), [], [Context]),
phrase(⟐(IR), ASM),
phrase(linker(ASM), EnumeratedASM),
% writeln(EnumeratedASM),
foo(Context),
phrase(asm(EnumeratedASM), Binary).
@ -124,8 +127,11 @@ CPUs.)
⦾([メ|Terms], [ % Mainloop.
label(MAIN),
if_zero(EXPR, HALT),
deref(EXPR),
split_word(TERM, EXPR),
deref(EXPR, TEMP0),
% At this point EXPR holds the record word of the expression and TEMP0
% has a copy of the address of the record.
split_pair(TERM, TEMP1, EXPR, TEMP0),
% Now Term has the term's record data and temp1 has the address of the term.
if_literal(TERM, PUSH),
lookup(DICT_PTR, DICT_TOP, TERM, HALT), % Jump to command or if not found halt.
label(PUSH), push(TOS, TERM, SP), % stack = TERM, stack
@ -133,7 +139,8 @@ CPUs.)
jump(MAIN)
|Ts]) -->
get([dict_ptr, DICT_PTR, dict_top, DICT_TOP, done, DONE, expr, EXPR,
halt, HALT, main, MAIN, sp, SP, term, TERM, tos, TOS]),
halt, HALT, main, MAIN, sp, SP, term, TERM, tos, TOS,
temp0, TEMP0, temp1, TEMP1]),
⦾(Terms, Ts).
⦾([Body, ≡(NameAtom)|Terms], [defi(Name, B, Prev, I, SP, TOS)|Ts]) -->
@ -282,6 +289,10 @@ language.
⟐(deref(Reg)) --> [load_word(Reg, Reg, 0)].
⟐(deref(Reg, Temp)) -->
[mov(Temp, Reg), % Save the address for adding it to offsets later.
load_word(Reg, Reg, 0)].
⟐(or_inplace(To, From)) --> [ior(To, To, From)].
⟐(definition(Label, Exit, Body, Prev)) -->
@ -338,6 +349,22 @@ language.
⟐(pop(Reg, TOS)) --> ⟐([split_word(Reg, TOS), deref(TOS)]).
% From is a register containing a pair record
% FromAddr is a register containing the address of the record in From
% after,
% To is a register that will contain the record from the head
% ToAddr holds the address of the record in To.
% From is a register containing a pair record
% FromAddr is a register containing the address of the record in From
⟐(split_pair(To, ToAddr, From, FromAddr)) -->
[ior_imm(ToAddr, From, -15), % roll right 15 bits
% No need to mask off high bits as the type tag for pairs is 00
add(ToAddr, ToAddr, FromAddr),
load_word(To, ToAddr, 0), % Bring the record in from RAM.
and_imm(From, From, 0x7fff), % Mask off lower 15 bits.
add(From, From, FromAddr) % Add the address to the offset.
].
/*