as-code.pl
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/*****************************************************************************/
/* */
/* Projecto de Compiladores ---------------------------------- VSPL */
/* Level 0 */
/* */
/* Code generation (Unix VAX assembler). */
/* */
/* Salvador Pinto Abreu */
/* */
/*****************************************************************************/
%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
%
cgInit <-> header, resetLabels(guard), resetLabels(if), resetLabels(rel).
header <-> tab, write('.set'), tab, write('rp, %11'), nl, nl.
global(N) <-> tab, write('.globl'), tab, write(N), nl.
extern(N) <-> tab, write('.globl'), tab, write(N), nl.
label(N) <-> write(N), write(':'), nl.
label(X,N) <-> tab, write('.'), write(X), nl, label(N).
prelude(LS, L)
<-> write('# args: '), write(A), write(' bytes'), nl,
write('# result: '), write(R), write(' bytes'), nl,
write('# locals: '), write(L), write(' bytes'), nl,
write('# temps: '), write(T), write(' bytes'), nl,
write('#'), nl,
dumpLocals(LS),
write('#'), nl,
tab, write(movl), tab, write('sp, fp'), nl,
tab, write(subl2), tab, write('$'), write(Sz), write(', sp'), nl
<= lookup1(sizes(args(A), result(R), locals(L), temps(T)), LS),
lookup1(temps(Ts), LS), computeTempSize(Ts, 0, T),
Sz is L+T.
postlude(LS)
<-> tab, write(movl), tab, write('fp, sp'), nl,
tab, write(rsb), nl, nl.
dumpLocals(X) ! <= var(X).
dumpLocals([id(I)-A|LS])
<-> lookup1(address(X), A), lookup1(type(_,Sz), A),
write('# '), write(I), write(':'), tab,
dumpClass(A),
write(' ('), write(Sz), write(' bytes)'), tab,
write('at '), arg(X,_), nl,
dumpLocals(LS).
dumpLocals([_|LS]) <-> dumpLocals(LS).
dumpClass(A) <-> write('local ') <= lookup1(write, A).
dumpClass(A) <-> write('argument') <= lookup1(formal, A).
dumpClass(A) <-> write('constant') <= lookup1(const(_), A).
computeTempSize(X, N, N) ! <= var(X).
computeTempSize([t(r(_),_,_)|Ts], A, B) <-> computeTempSize(Ts, A, B).
computeTempSize([t(_,S,_)|Ts], A, B) <-> computeTempSize(Ts, C, B) <= C is A+S.
%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
%
% cg/2: Emit the final assembly code. Attempt to make some peephole
% optimizations as well.
%
% Through with this code -----------------------------------------------------
cg([], T) !.
% Redundant push/pop registers -----------------------------------------------
cg([op1(pushr,X), op1(popr, X) | Os], T) <-> cg(Os, T).
% Generic opcode stream stuff ------------------------------------------------
cg([O|Os], T) <-> cg(O, T), cg(Os, T).
% Now the individual opcodes -------------------------------------------------
cg(label(X), T) <-> label(X).
cg(op5(Op, A1, A2, A3, A4, A5), T)
<-> tab, opcode(Op), tab,
arg(A1, T), coma,
arg(A2, T), coma,
arg(A3, T), coma,
arg(A4, T), coma,
arg(A5, T), nl.
cg(op3(Op, Len, A, A2, A), T)
<-> cg(op2(Op, Len, A2, A), T).
cg(op3(Op, Len, A1, A2, A3), T)
<-> tab, opcode(Op, 3, Len), tab,
arg(A2, T), coma,
arg(A1, T), coma,
arg(A3, T), nl.
cg(op3(Op, A1, A2, A3), T)
<-> tab, opcode(Op), tab,
arg(A1, T), coma,
arg(A2, T), coma,
arg(A3, T), nl.
cg(op2(Op, Len, A1, A2), T)
<-> tab, opcode(Op, 2, Len), tab,
arg(A1, T), coma,
arg(A2, T), nl.
cg(op2(Op, A1, A2), T)
<-> tab, opcode(Op), tab,
arg(A1, T), coma,
arg(A2, T), nl.
cg(op1(Op, Len, A), T)
<-> tab, opcode(Op, Len), tab,
arg(A, T), nl.
cg(op1(Op, A), T)
<-> tab, opcode(Op), tab,
arg(A, T), nl.
opcode(Op) <-> write(Op).
opcode(Op, L) <-> write(Op), length(L).
opcode(cmp, 2, L) <-> write(cmp), length(L).
opcode(mcom, 2, L) <-> write(mcom), length(L).
opcode(mov, 2, L) <-> write(mov), length(L).
opcode(mova, 2, L) <-> write(mova), (length(L) ; write('b')).
opcode(Op, N, L) <-> write(Op), length(L), write(N).
length(int) <-> write('l').
length(real) <-> write('f').
length(bool) <-> write('b').
length(byte) <-> write('b').
length(char) <-> write('c').
arg(label(X), T) <-> write(X).
arg(offset(0, R), T) <-> write('('), arg(R, T), write(')').
arg(offset(N, R), T) <-> write(N), write('('), arg(R, T), write(')').
arg(autodec(R), T) <-> write('-('), reg(R), write(')').
arg(autoinc(R), T) <-> write('('), reg(R), write(')+').
arg(lit(X), T) <-> write('$'), arg(X, T).
arg(int(X), T) <-> write(X).
arg(byte(X), T) <-> write(X).
arg(bool(true), T) <-> write(1).
arg(bool(false), T) <-> write(0).
arg(bool(X), T) <-> write(X).
arg(real(X), T) <-> write('0f'), wfloat(X).
arg(string(X), T) <-> stringArg(X).
arg(hex(X), T) <-> write('0x'), hex(X).
arg(reg(X), T) <-> reg(X).
arg(t(r(N),_,_), T) <-> reg(r(N)).
arg(t(N,S,_), T) <-> M is N-T, arg(offset(M,fp), T).
arg(indirect(reg(R)), T) <-> write('('), reg(R), write(')').
arg(indirect(t(r(N),_,_)), T) <-> write('('), reg(r(N)), write(')').
arg(indirect(X), T) <-> write('*'), arg(X, T).
arg(R, T) <-> reg(R).
hex(0) <-> write(0).
hex(N) <-> hexDigit(N) <= N < 16.
hex(N) <-> hex(M), hexDigit(D) <= M is N//16, D is mod(N,16).
hexDigit(N) <-> write(N) <= N < 10.
hexDigit(N) <-> "A"=[X], Y is X+N-10, put(Y).
reg(reg(X)) <-> reg(X).
reg(r(N)) <-> write(r), write(N).
reg(rp) <-> write(r11).
reg(X) <-> write(X).
wfloat(X) <-> write(X), write('.0') <= integer(X).
wfloat(X) <-> write(X).
stringArg(X)
<-> assertz(strings(L, X))
<= newLabel(lit, N), genLabel(str, N, L), write(L).
data(lit(int(V))) <-> write('.long'), tab, arg(int(V), S).
data(lit(real(V))) <-> write('.float'), tab, arg(real(V), S).
data(lit(bool(V))) <-> write('.byte'), tab, arg(bool(V), S).
tab <-> put(9).
coma <-> put(44), put(32).