ref: 12f7fc7a0874c568e147627ca043eff33be6188e
dir: /sys/src/cmd/6a/a.y/
%{
#include "a.h"
%}
%union {
Sym *sym;
vlong lval;
double dval;
char sval[8];
Gen gen;
Gen2 gen2;
}
%left '|'
%left '^'
%left '&'
%left '<' '>'
%left '+' '-'
%left '*' '/' '%'
%token <lval> LTYPE0 LTYPE1 LTYPE2 LTYPE3 LTYPE4
%token <lval> LTYPEC LTYPED LTYPEN LTYPER LTYPET LTYPES LTYPEM LTYPEI LTYPEXC LTYPEX LTYPERT
%token <lval> LCONST LFP LPC LSB
%token <lval> LBREG LLREG LSREG LFREG LMREG LXREG
%token <dval> LFCONST
%token <sval> LSCONST LSP
%token <sym> LNAME LLAB LVAR
%type <lval> con expr pointer offset
%type <gen> mem imm reg nam rel rem rim rom omem nmem
%type <gen2> nonnon nonrel nonrem rimnon rimrem remrim spec10
%type <gen2> spec1 spec2 spec3 spec4 spec5 spec6 spec7 spec8 spec9
%%
prog:
| prog line
line:
LLAB ':'
{
if($1->value != pc)
yyerror("redeclaration of %s", $1->name);
$1->value = pc;
}
line
| LNAME ':'
{
$1->type = LLAB;
$1->value = pc;
}
line
| ';'
| inst ';'
| error ';'
inst:
LNAME '=' expr
{
$1->type = LVAR;
$1->value = $3;
}
| LVAR '=' expr
{
if($1->value != $3)
yyerror("redeclaration of %s", $1->name);
$1->value = $3;
}
| LTYPE0 nonnon { outcode($1, &$2); }
| LTYPE1 nonrem { outcode($1, &$2); }
| LTYPE2 rimnon { outcode($1, &$2); }
| LTYPE3 rimrem { outcode($1, &$2); }
| LTYPE4 remrim { outcode($1, &$2); }
| LTYPER nonrel { outcode($1, &$2); }
| LTYPED spec1 { outcode($1, &$2); }
| LTYPET spec2 { outcode($1, &$2); }
| LTYPEC spec3 { outcode($1, &$2); }
| LTYPEN spec4 { outcode($1, &$2); }
| LTYPES spec5 { outcode($1, &$2); }
| LTYPEM spec6 { outcode($1, &$2); }
| LTYPEI spec7 { outcode($1, &$2); }
| LTYPEXC spec8 { outcode($1, &$2); }
| LTYPEX spec9 { outcode($1, &$2); }
| LTYPERT spec10 { outcode($1, &$2); }
nonnon:
{
$$.from = nullgen;
$$.to = nullgen;
}
| ','
{
$$.from = nullgen;
$$.to = nullgen;
}
rimrem:
rim ',' rem
{
$$.from = $1;
$$.to = $3;
}
remrim:
rem ',' rim
{
$$.from = $1;
$$.to = $3;
}
rimnon:
rim ','
{
$$.from = $1;
$$.to = nullgen;
}
| rim
{
$$.from = $1;
$$.to = nullgen;
}
nonrem:
',' rem
{
$$.from = nullgen;
$$.to = $2;
}
| rem
{
$$.from = nullgen;
$$.to = $1;
}
nonrel:
',' rel
{
$$.from = nullgen;
$$.to = $2;
}
| rel
{
$$.from = nullgen;
$$.to = $1;
}
spec1: /* DATA */
nam '/' con ',' imm
{
$$.from = $1;
$$.from.scale = $3;
$$.to = $5;
}
spec2: /* TEXT */
mem ',' imm
{
$$.from = $1;
$$.to = $3;
}
| mem ',' con ',' imm
{
$$.from = $1;
$$.from.scale = $3;
$$.to = $5;
}
spec3: /* JMP/CALL */
',' rom
{
$$.from = nullgen;
$$.to = $2;
}
| rom
{
$$.from = nullgen;
$$.to = $1;
}
spec4: /* NOP */
nonnon
| nonrem
spec5: /* SHL/SHR */
rim ',' rem
{
$$.from = $1;
$$.to = $3;
}
| rim ',' rem ':' LLREG
{
$$.from = $1;
$$.to = $3;
if($$.from.index != D_NONE)
yyerror("dp shift with lhs index");
$$.from.index = $5;
}
spec6: /* MOVW/MOVL */
rim ',' rem
{
$$.from = $1;
$$.to = $3;
}
| rim ',' rem ':' LSREG
{
$$.from = $1;
$$.to = $3;
if($$.to.index != D_NONE)
yyerror("dp move with lhs index");
$$.to.index = $5;
}
spec7:
rim ','
{
$$.from = $1;
$$.to = nullgen;
}
| rim
{
$$.from = $1;
$$.to = nullgen;
}
| rim ',' rem
{
$$.from = $1;
$$.to = $3;
}
spec8: /* CMPPS/CMPPD */
reg ',' rem ',' con
{
$$.from = $1;
$$.to = $3;
$$.from.offset = $5;
}
spec9: /* shufl */
imm ',' rem ',' reg
{
$$.from = $3;
$$.to = $5;
if($1.type != D_CONST)
yyerror("illegal constant");
$$.to.offset = $1.offset;
}
spec10: /* RET/RETF */
{
$$.from = nullgen;
$$.to = nullgen;
}
| imm
{
$$.from = $1;
$$.to = nullgen;
}
rem:
reg
| mem
rom:
rel
| nmem
| '*' reg
{
$$ = $2;
}
| '*' omem
{
$$ = $2;
}
| reg
| omem
rim:
rem
| imm
rel:
con '(' LPC ')'
{
$$ = nullgen;
$$.type = D_BRANCH;
$$.offset = $1 + pc;
}
| LNAME offset
{
$$ = nullgen;
if(pass == 2)
yyerror("undefined label: %s", $1->name);
$$.type = D_BRANCH;
$$.sym = $1;
$$.offset = $2;
}
| LLAB offset
{
$$ = nullgen;
$$.type = D_BRANCH;
$$.sym = $1;
$$.offset = $1->value + $2;
}
reg:
LBREG
{
$$ = nullgen;
$$.type = $1;
}
| LFREG
{
$$ = nullgen;
$$.type = $1;
}
| LLREG
{
$$ = nullgen;
$$.type = $1;
}
| LMREG
{
$$ = nullgen;
$$.type = $1;
}
| LSP
{
$$ = nullgen;
$$.type = D_SP;
}
| LSREG
{
$$ = nullgen;
$$.type = $1;
}
| LXREG
{
$$ = nullgen;
$$.type = $1;
}
imm:
'$' con
{
$$ = nullgen;
$$.type = D_CONST;
$$.offset = $2;
}
| '$' nam
{
$$ = $2;
$$.index = $2.type;
$$.type = D_ADDR;
/*
if($2.type == D_AUTO || $2.type == D_PARAM)
yyerror("constant cannot be automatic: %s",
$2.sym->name);
*/
}
| '$' LSCONST
{
$$ = nullgen;
$$.type = D_SCONST;
memcpy($$.sval, $2, sizeof($$.sval));
}
| '$' LFCONST
{
$$ = nullgen;
$$.type = D_FCONST;
$$.dval = $2;
}
| '$' '(' LFCONST ')'
{
$$ = nullgen;
$$.type = D_FCONST;
$$.dval = $3;
}
| '$' '-' LFCONST
{
$$ = nullgen;
$$.type = D_FCONST;
$$.dval = -$3;
}
mem:
omem
| nmem
omem:
con
{
$$ = nullgen;
$$.type = D_INDIR+D_NONE;
$$.offset = $1;
}
| con '(' LLREG ')'
{
$$ = nullgen;
$$.type = D_INDIR+$3;
$$.offset = $1;
}
| con '(' LSP ')'
{
$$ = nullgen;
$$.type = D_INDIR+D_SP;
$$.offset = $1;
}
| con '(' LLREG '*' con ')'
{
$$ = nullgen;
$$.type = D_INDIR+D_NONE;
$$.offset = $1;
$$.index = $3;
$$.scale = $5;
checkscale($$.scale);
}
| con '(' LLREG ')' '(' LLREG '*' con ')'
{
$$ = nullgen;
$$.type = D_INDIR+$3;
$$.offset = $1;
$$.index = $6;
$$.scale = $8;
checkscale($$.scale);
}
| '(' LLREG ')'
{
$$ = nullgen;
$$.type = D_INDIR+$2;
}
| '(' LSP ')'
{
$$ = nullgen;
$$.type = D_INDIR+D_SP;
}
| '(' LLREG '*' con ')'
{
$$ = nullgen;
$$.type = D_INDIR+D_NONE;
$$.index = $2;
$$.scale = $4;
checkscale($$.scale);
}
| '(' LLREG ')' '(' LLREG '*' con ')'
{
$$ = nullgen;
$$.type = D_INDIR+$2;
$$.index = $5;
$$.scale = $7;
checkscale($$.scale);
}
nmem:
nam
{
$$ = $1;
}
| nam '(' LLREG '*' con ')'
{
$$ = $1;
$$.index = $3;
$$.scale = $5;
checkscale($$.scale);
}
nam:
LNAME offset '(' pointer ')'
{
$$ = nullgen;
$$.type = $4;
$$.sym = $1;
$$.offset = $2;
}
| LNAME '<' '>' offset '(' LSB ')'
{
$$ = nullgen;
$$.type = D_STATIC;
$$.sym = $1;
$$.offset = $4;
}
offset:
{
$$ = 0;
}
| '+' con
{
$$ = $2;
}
| '-' con
{
$$ = -$2;
}
pointer:
LSB
| LSP
{
$$ = D_AUTO;
}
| LFP
con:
LCONST
| LVAR
{
$$ = $1->value;
}
| '-' con
{
$$ = -$2;
}
| '+' con
{
$$ = $2;
}
| '~' con
{
$$ = ~$2;
}
| '(' expr ')'
{
$$ = $2;
}
expr:
con
| expr '+' expr
{
$$ = $1 + $3;
}
| expr '-' expr
{
$$ = $1 - $3;
}
| expr '*' expr
{
$$ = $1 * $3;
}
| expr '/' expr
{
$$ = $1 / $3;
}
| expr '%' expr
{
$$ = $1 % $3;
}
| expr '<' '<' expr
{
$$ = $1 << $4;
}
| expr '>' '>' expr
{
$$ = $1 >> $4;
}
| expr '&' expr
{
$$ = $1 & $3;
}
| expr '^' expr
{
$$ = $1 ^ $3;
}
| expr '|' expr
{
$$ = $1 | $3;
}