ref: 36af8405521be371605e4658ec8f4b133f3c7d6f
dir: /sys/src/cmd/cc/cc.y/
%{ #include "cc.h" %} %union { Node* node; Sym* sym; Type* type; struct { Type* t; uchar c; } tycl; struct { Type* t1; Type* t2; Type* t3; uchar c; } tyty; struct { char* s; long l; } sval; long lval; double dval; vlong vval; } %type <sym> ltag %type <lval> gctname gcname cname gname tname %type <lval> gctnlist gcnlist zgnlist %type <type> tlist sbody complex %type <tycl> types %type <node> zarglist arglist zcexpr %type <node> name block stmnt cexpr expr xuexpr pexpr %type <node> zelist elist adecl slist uexpr string lstring %type <node> xdecor xdecor2 labels label ulstmnt %type <node> adlist edecor tag qual qlist %type <node> abdecor abdecor1 abdecor2 abdecor3 %type <node> zexpr lexpr init ilist forexpr %left ';' %left ',' %right '=' LPE LME LMLE LDVE LMDE LRSHE LLSHE LANDE LXORE LORE %right '?' ':' %left LOROR %left LANDAND %left '|' %left '^' %left '&' %left LEQ LNE %left '<' '>' LLE LGE %left LLSH LRSH %left '+' '-' %left '*' '/' '%' %right LMM LPP LMG '.' '[' '(' %token <sym> LNAME LTYPE %token <dval> LFCONST LDCONST %token <vval> LCONST LLCONST LUCONST LULCONST LVLCONST LUVLCONST %token <sval> LSTRING LLSTRING %token LAUTO LBREAK LCASE LCHAR LCONTINUE LDEFAULT LDO %token LDOUBLE LELSE LEXTERN LFLOAT LFOR LGOTO %token LIF LINT LLONG LREGISTER LRETURN LSHORT LSIZEOF LUSED %token LSTATIC LSTRUCT LSWITCH LTYPEDEF LTYPESTR LUNION LUNSIGNED %token LWHILE LVOID LENUM LSIGNED LCONSTNT LVOLATILE LSET LSIGNOF %token LRESTRICT LINLINE %% prog: | prog xdecl /* * external declarator */ xdecl: zctlist ';' { dodecl(xdecl, lastclass, lasttype, Z); } | zctlist xdlist ';' | zctlist xdecor { lastdcl = T; firstarg = S; dodecl(xdecl, lastclass, lasttype, $2); if(lastdcl == T || lastdcl->etype != TFUNC) { diag($2, "not a function"); lastdcl = types[TFUNC]; } thisfn = lastdcl; markdcl(); firstdcl = dclstack; argmark($2, 0); } pdecl { argmark($2, 1); } block { Node *n; n = revertdcl(); if(n) $6 = new(OLIST, n, $6); if(!debug['a'] && !debug['Z']) codgen($6, $2); } xdlist: xdecor { dodecl(xdecl, lastclass, lasttype, $1); } | xdecor { $1 = dodecl(xdecl, lastclass, lasttype, $1); } '=' init { doinit($1->sym, $1->type, 0L, $4); } | xdlist ',' xdlist xdecor: xdecor2 | '*' zgnlist xdecor { $$ = new(OIND, $3, Z); $$->garb = simpleg($2); } xdecor2: tag | '(' xdecor ')' { $$ = $2; } | xdecor2 '(' zarglist ')' { $$ = new(OFUNC, $1, $3); } | xdecor2 '[' zexpr ']' { $$ = new(OARRAY, $1, $3); } /* * automatic declarator */ adecl: ctlist ';' { $$ = dodecl(adecl, lastclass, lasttype, Z); } | ctlist adlist ';' { $$ = $2; } adlist: xdecor { dodecl(adecl, lastclass, lasttype, $1); $$ = Z; } | xdecor { $1 = dodecl(adecl, lastclass, lasttype, $1); } '=' init { long w; w = $1->sym->type->width; $$ = doinit($1->sym, $1->type, 0L, $4); $$ = contig($1->sym, $$, w); } | adlist ',' adlist { $$ = $1; if($3 != Z) { $$ = $3; if($1 != Z) $$ = new(OLIST, $1, $3); } } /* * parameter declarator */ pdecl: | pdecl ctlist pdlist ';' pdlist: xdecor { dodecl(pdecl, lastclass, lasttype, $1); } | pdlist ',' pdlist /* * structure element declarator */ edecl: tlist { lasttype = $1; } zedlist ';' | edecl tlist { lasttype = $2; } zedlist ';' zedlist: /* extension */ { lastfield = 0; edecl(CXXX, lasttype, S); } | edlist edlist: edecor { dodecl(edecl, CXXX, lasttype, $1); } | edlist ',' edlist edecor: xdecor { lastbit = 0; firstbit = 1; } | tag ':' lexpr { $$ = new(OBIT, $1, $3); } | ':' lexpr { $$ = new(OBIT, Z, $2); } /* * abstract declarator */ abdecor: { $$ = (Z); } | abdecor1 abdecor1: '*' zgnlist { $$ = new(OIND, (Z), Z); $$->garb = simpleg($2); } | '*' zgnlist abdecor1 { $$ = new(OIND, $3, Z); $$->garb = simpleg($2); } | abdecor2 abdecor2: abdecor3 | abdecor2 '(' zarglist ')' { $$ = new(OFUNC, $1, $3); } | abdecor2 '[' zexpr ']' { $$ = new(OARRAY, $1, $3); } abdecor3: '(' ')' { $$ = new(OFUNC, (Z), Z); } | '[' zexpr ']' { $$ = new(OARRAY, (Z), $2); } | '(' abdecor1 ')' { $$ = $2; } init: expr | '{' ilist '}' { $$ = new(OINIT, invert($2), Z); } qual: '[' lexpr ']' { $$ = new(OARRAY, $2, Z); } | '.' ltag { $$ = new(OELEM, Z, Z); $$->sym = $2; } | qual '=' qlist: init ',' | qlist init ',' { $$ = new(OLIST, $1, $2); } | qual | qlist qual { $$ = new(OLIST, $1, $2); } ilist: qlist | init | qlist init { $$ = new(OLIST, $1, $2); } zarglist: { $$ = Z; } | arglist { $$ = invert($1); } arglist: name | tlist abdecor { $$ = new(OPROTO, $2, Z); $$->type = $1; } | tlist xdecor { $$ = new(OPROTO, $2, Z); $$->type = $1; } | '.' '.' '.' { $$ = new(ODOTDOT, Z, Z); } | arglist ',' arglist { $$ = new(OLIST, $1, $3); } block: '{' slist '}' { $$ = invert($2); // if($2 != Z) // $$ = new(OLIST, $2, $$); if($$ == Z) $$ = new(OLIST, Z, Z); } slist: { $$ = Z; } | slist adecl { $$ = new(OLIST, $1, $2); } | slist stmnt { $$ = new(OLIST, $1, $2); } labels: label | labels label { $$ = new(OLIST, $1, $2); } label: LCASE expr ':' { $$ = new(OCASE, $2, Z); } | LDEFAULT ':' { $$ = new(OCASE, Z, Z); } | LNAME ':' { $$ = new(OLABEL, dcllabel($1, 1), Z); } stmnt: error ';' { $$ = Z; } | ulstmnt | labels ulstmnt { $$ = new(OLIST, $1, $2); } forexpr: zcexpr | ctlist adlist { $$ = $2; } ulstmnt: zcexpr ';' | { markdcl(); } block { $$ = revertdcl(); if($$) $$ = new(OLIST, $$, $2); else $$ = $2; } | LIF '(' cexpr ')' stmnt { $$ = new(OIF, $3, new(OLIST, $5, Z)); if($5 == Z) warn($3, "empty if body"); } | LIF '(' cexpr ')' stmnt LELSE stmnt { $$ = new(OIF, $3, new(OLIST, $5, $7)); if($5 == Z) warn($3, "empty if body"); if($7 == Z) warn($3, "empty else body"); } | { markdcl(); } LFOR '(' forexpr ';' zcexpr ';' zcexpr ')' stmnt { $$ = revertdcl(); if($$){ if($4) $4 = new(OLIST, $$, $4); else $4 = $$; } $$ = new(OFOR, new(OLIST, $6, new(OLIST, $4, $8)), $10); } | LWHILE '(' cexpr ')' stmnt { $$ = new(OWHILE, $3, $5); } | LDO stmnt LWHILE '(' cexpr ')' ';' { $$ = new(ODWHILE, $5, $2); } | LRETURN zcexpr ';' { $$ = new(ORETURN, $2, Z); $$->type = thisfn->link; } | LSWITCH '(' cexpr ')' stmnt { $$ = new(OCONST, Z, Z); $$->vconst = 0; $$->type = types[TINT]; $3 = new(OSUB, $$, $3); $$ = new(OCONST, Z, Z); $$->vconst = 0; $$->type = types[TINT]; $3 = new(OSUB, $$, $3); $$ = new(OSWITCH, $3, $5); } | LBREAK ';' { $$ = new(OBREAK, Z, Z); } | LCONTINUE ';' { $$ = new(OCONTINUE, Z, Z); } | LGOTO ltag ';' { $$ = new(OGOTO, dcllabel($2, 0), Z); } | LUSED '(' zelist ')' ';' { $$ = new(OUSED, $3, Z); } | LSET '(' zelist ')' ';' { $$ = new(OSET, $3, Z); } zcexpr: { $$ = Z; } | cexpr zexpr: { $$ = Z; } | lexpr lexpr: expr { $$ = new(OCAST, $1, Z); $$->type = types[TLONG]; } cexpr: expr | cexpr ',' cexpr { $$ = new(OCOMMA, $1, $3); } expr: xuexpr | expr '*' expr { $$ = new(OMUL, $1, $3); } | expr '/' expr { $$ = new(ODIV, $1, $3); } | expr '%' expr { $$ = new(OMOD, $1, $3); } | expr '+' expr { $$ = new(OADD, $1, $3); } | expr '-' expr { $$ = new(OSUB, $1, $3); } | expr LRSH expr { $$ = new(OASHR, $1, $3); } | expr LLSH expr { $$ = new(OASHL, $1, $3); } | expr '<' expr { $$ = new(OLT, $1, $3); } | expr '>' expr { $$ = new(OGT, $1, $3); } | expr LLE expr { $$ = new(OLE, $1, $3); } | expr LGE expr { $$ = new(OGE, $1, $3); } | expr LEQ expr { $$ = new(OEQ, $1, $3); } | expr LNE expr { $$ = new(ONE, $1, $3); } | expr '&' expr { $$ = new(OAND, $1, $3); } | expr '^' expr { $$ = new(OXOR, $1, $3); } | expr '|' expr { $$ = new(OOR, $1, $3); } | expr LANDAND expr { $$ = new(OANDAND, $1, $3); } | expr LOROR expr { $$ = new(OOROR, $1, $3); } | expr '?' cexpr ':' expr { $$ = new(OCOND, $1, new(OLIST, $3, $5)); } | expr '=' expr { $$ = new(OAS, $1, $3); } | expr LPE expr { $$ = new(OASADD, $1, $3); } | expr LME expr { $$ = new(OASSUB, $1, $3); } | expr LMLE expr { $$ = new(OASMUL, $1, $3); } | expr LDVE expr { $$ = new(OASDIV, $1, $3); } | expr LMDE expr { $$ = new(OASMOD, $1, $3); } | expr LLSHE expr { $$ = new(OASASHL, $1, $3); } | expr LRSHE expr { $$ = new(OASASHR, $1, $3); } | expr LANDE expr { $$ = new(OASAND, $1, $3); } | expr LXORE expr { $$ = new(OASXOR, $1, $3); } | expr LORE expr { $$ = new(OASOR, $1, $3); } xuexpr: uexpr | '(' tlist abdecor ')' xuexpr { $$ = new(OCAST, $5, Z); dodecl(NODECL, CXXX, $2, $3); $$->type = lastdcl; $$->xcast = 1; } | '(' tlist abdecor ')' '{' ilist '}' /* extension */ { $$ = new(OSTRUCT, $6, Z); dodecl(NODECL, CXXX, $2, $3); $$->type = lastdcl; } uexpr: pexpr | '*' xuexpr { $$ = new(OIND, $2, Z); } | '&' xuexpr { $$ = new(OADDR, $2, Z); } | '+' xuexpr { $$ = new(OPOS, $2, Z); } | '-' xuexpr { $$ = new(ONEG, $2, Z); } | '!' xuexpr { $$ = new(ONOT, $2, Z); } | '~' xuexpr { $$ = new(OCOM, $2, Z); } | LPP xuexpr { $$ = new(OPREINC, $2, Z); } | LMM xuexpr { $$ = new(OPREDEC, $2, Z); } | LSIZEOF uexpr { $$ = new(OSIZE, $2, Z); } | LSIGNOF uexpr { $$ = new(OSIGN, $2, Z); } pexpr: '(' cexpr ')' { $$ = $2; } | LSIZEOF '(' tlist abdecor ')' { $$ = new(OSIZE, Z, Z); dodecl(NODECL, CXXX, $3, $4); $$->type = lastdcl; } | LSIGNOF '(' tlist abdecor ')' { $$ = new(OSIGN, Z, Z); dodecl(NODECL, CXXX, $3, $4); $$->type = lastdcl; } | pexpr '(' zelist ')' { $$ = new(OFUNC, $1, Z); if($1->op == ONAME) if($1->type == T) dodecl(xdecl, CXXX, types[TINT], $$); $$->right = invert($3); } | pexpr '[' cexpr ']' { $$ = new(OIND, new(OADD, $1, $3), Z); } | pexpr LMG ltag { $$ = new(ODOT, new(OIND, $1, Z), Z); $$->sym = $3; } | pexpr '.' ltag { $$ = new(ODOT, $1, Z); $$->sym = $3; } | pexpr LPP { $$ = new(OPOSTINC, $1, Z); } | pexpr LMM { $$ = new(OPOSTDEC, $1, Z); } | name | LCONST { $$ = new(OCONST, Z, Z); $$->type = types[TINT]; $$->vconst = $1; $$->cstring = strdup(symb); } | LLCONST { $$ = new(OCONST, Z, Z); $$->type = types[TLONG]; $$->vconst = $1; $$->cstring = strdup(symb); } | LUCONST { $$ = new(OCONST, Z, Z); $$->type = types[TUINT]; $$->vconst = $1; $$->cstring = strdup(symb); } | LULCONST { $$ = new(OCONST, Z, Z); $$->type = types[TULONG]; $$->vconst = $1; $$->cstring = strdup(symb); } | LDCONST { $$ = new(OCONST, Z, Z); $$->type = types[TDOUBLE]; $$->fconst = $1; $$->cstring = strdup(symb); } | LFCONST { $$ = new(OCONST, Z, Z); $$->type = types[TFLOAT]; $$->fconst = $1; $$->cstring = strdup(symb); } | LVLCONST { $$ = new(OCONST, Z, Z); $$->type = types[TVLONG]; $$->vconst = $1; $$->cstring = strdup(symb); } | LUVLCONST { $$ = new(OCONST, Z, Z); $$->type = types[TUVLONG]; $$->vconst = $1; $$->cstring = strdup(symb); } | string | lstring string: LSTRING { $$ = new(OSTRING, Z, Z); $$->type = typ(TARRAY, types[TCHAR]); $$->type->width = $1.l + 1; $$->cstring = $1.s; $$->sym = symstring; $$->etype = TARRAY; $$->class = CSTATIC; } | string LSTRING { char *s; int n; n = $1->type->width - 1; s = alloc(n+$2.l+MAXALIGN); memcpy(s, $1->cstring, n); memcpy(s+n, $2.s, $2.l); s[n+$2.l] = 0; $$ = $1; $$->type->width += $2.l; $$->cstring = s; } lstring: LLSTRING { $$ = new(OLSTRING, Z, Z); $$->type = typ(TARRAY, types[TRUNE]); $$->type->width = $1.l + sizeof(Rune); $$->rstring = (Rune*)$1.s; $$->sym = symstring; $$->etype = TARRAY; $$->class = CSTATIC; } | lstring LLSTRING { char *s; int n; n = $1->type->width - sizeof(Rune); s = alloc(n+$2.l+MAXALIGN); memcpy(s, $1->rstring, n); memcpy(s+n, $2.s, $2.l); *(Rune*)(s+n+$2.l) = 0; $$ = $1; $$->type->width += $2.l; $$->rstring = (Rune*)s; } zelist: { $$ = Z; } | elist elist: expr | elist ',' elist { $$ = new(OLIST, $1, $3); } sbody: '{' { $<tyty>$.t1 = strf; $<tyty>$.t2 = strl; $<tyty>$.t3 = lasttype; $<tyty>$.c = lastclass; strf = T; strl = T; lastbit = 0; firstbit = 1; lastclass = CXXX; lasttype = T; } edecl '}' { $$ = strf; strf = $<tyty>2.t1; strl = $<tyty>2.t2; lasttype = $<tyty>2.t3; lastclass = $<tyty>2.c; } zctlist: { lastclass = CXXX; lasttype = types[TINT]; } | ctlist types: complex { $$.t = $1; $$.c = CXXX; } | tname { $$.t = simplet($1); $$.c = CXXX; } | gcnlist { $$.t = simplet($1); $$.c = simplec($1); $$.t = garbt($$.t, $1); } | complex gctnlist { $$.t = $1; $$.c = simplec($2); $$.t = garbt($$.t, $2); if($2 & ~BCLASS & ~BGARB) diag(Z, "duplicate types given: %T and %Q", $1, $2); } | tname gctnlist { $$.t = simplet(typebitor($1, $2)); $$.c = simplec($2); $$.t = garbt($$.t, $2); } | gcnlist complex zgnlist { $$.t = $2; $$.c = simplec($1); $$.t = garbt($$.t, $1|$3); } | gcnlist tname { $$.t = simplet($2); $$.c = simplec($1); $$.t = garbt($$.t, $1); } | gcnlist tname gctnlist { $$.t = simplet(typebitor($2, $3)); $$.c = simplec($1|$3); $$.t = garbt($$.t, $1|$3); } tlist: types { $$ = $1.t; if($1.c != CXXX) diag(Z, "illegal combination of class 4: %s", cnames[$1.c]); } ctlist: types { lasttype = $1.t; lastclass = $1.c; } complex: LSTRUCT ltag { dotag($2, TSTRUCT, 0); $$ = $2->suetag; } | LSTRUCT ltag { dotag($2, TSTRUCT, autobn); } sbody { $$ = $2->suetag; if($$->link != T) diag(Z, "redeclare tag: %s", $2->name); $$->link = $4; sualign($$); } | LSTRUCT sbody { taggen++; sprint(symb, "_%d_", taggen); $$ = dotag(lookup(), TSTRUCT, autobn); $$->link = $2; sualign($$); } | LUNION ltag { dotag($2, TUNION, 0); $$ = $2->suetag; } | LUNION ltag { dotag($2, TUNION, autobn); } sbody { $$ = $2->suetag; if($$->link != T) diag(Z, "redeclare tag: %s", $2->name); $$->link = $4; sualign($$); } | LUNION sbody { taggen++; sprint(symb, "_%d_", taggen); $$ = dotag(lookup(), TUNION, autobn); $$->link = $2; sualign($$); } | LENUM ltag { dotag($2, TENUM, 0); $$ = $2->suetag; if($$->link == T) $$->link = types[TINT]; $$ = $$->link; } | LENUM ltag { dotag($2, TENUM, autobn); } '{' { en.tenum = T; en.cenum = T; } enum '}' { $$ = $2->suetag; if($$->link != T) diag(Z, "redeclare tag: %s", $2->name); if(en.tenum == T) { diag(Z, "enum type ambiguous: %s", $2->name); en.tenum = types[TINT]; } $$->link = en.tenum; $$ = en.tenum; } | LENUM '{' { en.tenum = T; en.cenum = T; } enum '}' { $$ = en.tenum; } | LTYPE { $$ = tcopy($1->type); } gctnlist: gctname | gctnlist gctname { $$ = typebitor($1, $2); } zgnlist: { $$ = 0; } | zgnlist gname { $$ = typebitor($1, $2); } gctname: tname | gname | cname gcnlist: gcname | gcnlist gcname { $$ = typebitor($1, $2); } gcname: gname | cname enum: LNAME { doenum($1, Z); } | LNAME '=' expr { doenum($1, $3); } | enum ',' | enum ',' enum tname: /* type words */ LCHAR { $$ = BCHAR; } | LSHORT { $$ = BSHORT; } | LINT { $$ = BINT; } | LLONG { $$ = BLONG; } | LSIGNED { $$ = BSIGNED; } | LUNSIGNED { $$ = BUNSIGNED; } | LFLOAT { $$ = BFLOAT; } | LDOUBLE { $$ = BDOUBLE; } | LVOID { $$ = BVOID; } cname: /* class words */ LAUTO { $$ = BAUTO; } | LSTATIC { $$ = BSTATIC; } | LEXTERN { $$ = BEXTERN; } | LTYPEDEF { $$ = BTYPEDEF; } | LTYPESTR { $$ = BTYPESTR; } | LREGISTER { $$ = BREGISTER; } | LINLINE { $$ = 0; } gname: /* garbage words */ LCONSTNT { $$ = BCONSTNT; } | LVOLATILE { $$ = BVOLATILE; } | LRESTRICT { $$ = 0; } name: LNAME { $$ = new(ONAME, Z, Z); if($1->class == CLOCAL) $1 = mkstatic($1); $$->sym = $1; $$->type = $1->type; $$->etype = TVOID; if($$->type != T) $$->etype = $$->type->etype; $$->xoffset = $1->offset; $$->class = $1->class; $1->aused = 1; } tag: ltag { $$ = new(ONAME, Z, Z); $$->sym = $1; $$->type = $1->type; $$->etype = TVOID; if($$->type != T) $$->etype = $$->type->etype; $$->xoffset = $1->offset; $$->class = $1->class; } ltag: LNAME | LTYPE %%