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- %{
- #include "a.h"
- %}
- %union {
- Sym *sym;
- long lval;
- double dval;
- char sval[8];
- Addr addr;
- Gen gen;
- Gen2 gen2;
- }
- %left '|'
- %left '^'
- %left '&'
- %left '<' '>'
- %left '+' '-'
- %left '*' '/' '%'
- %token <lval> LTYPE1 LTYPE2 LTYPE3 LTYPE4 LTYPE5
- %token <lval> LTYPE6 LTYPE7 LTYPE8 LTYPE9 LTYPEA LTYPEB
- %token <lval> LCONST LSP LSB LFP LPC LTOS LAREG LDREG LFREG
- %token <dval> LFCONST
- %token <sval> LSCONST
- %token <sym> LNAME LLAB LVAR
- %type <lval> con expr type pointer reg offset
- %type <addr> name areg
- %type <gen> gen rel
- %type <gen2> noaddr gengen dstgen spec1 spec2 spec3 srcgen dstrel genrel
- %%
- 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;
- }
- | LTYPE1 gengen { outcode($1, &$2); }
- | LTYPE2 noaddr { outcode($1, &$2); }
- | LTYPE3 dstgen { outcode($1, &$2); }
- | LTYPE4 spec1 { outcode($1, &$2); }
- | LTYPE5 srcgen { outcode($1, &$2); }
- | LTYPE6 dstrel { outcode($1, &$2); }
- | LTYPE7 genrel { outcode($1, &$2); }
- | LTYPE8 dstgen { outcode($1, &$2); }
- | LTYPE8 gengen { outcode($1, &$2); }
- | LTYPE9 noaddr { outcode($1, &$2); }
- | LTYPE9 dstgen { outcode($1, &$2); }
- | LTYPEA spec2 { outcode($1, &$2); }
- | LTYPEB spec3 { outcode($1, &$2); }
- noaddr:
- {
- $$.from = nullgen;
- $$.to = nullgen;
- }
- | ','
- {
- $$.from = nullgen;
- $$.to = nullgen;
- }
- srcgen:
- gen
- {
- $$.from = $1;
- $$.to = nullgen;
- }
- | gen ','
- {
- $$.from = $1;
- $$.to = nullgen;
- }
- dstgen:
- gen
- {
- $$.from = nullgen;
- $$.to = $1;
- }
- | ',' gen
- {
- $$.from = nullgen;
- $$.to = $2;
- }
- gengen:
- gen ',' gen
- {
- $$.from = $1;
- $$.to = $3;
- }
- dstrel:
- rel
- {
- $$.from = nullgen;
- $$.to = $1;
- }
- | ',' rel
- {
- $$.from = nullgen;
- $$.to = $2;
- }
- genrel:
- gen ',' rel
- {
- $$.from = $1;
- $$.to = $3;
- }
- spec1: /* DATA opcode */
- gen '/' con ',' gen
- {
- $1.displace = $3;
- $$.from = $1;
- $$.to = $5;
- }
- spec2: /* bit field opcodes */
- gen ',' gen ',' con ',' con
- {
- $1.field = $7;
- $3.field = $5;
- $$.from = $1;
- $$.to = $3;
- }
- spec3: /* TEXT opcode */
- gengen
- | gen ',' con ',' gen
- {
- $1.displace = $3;
- $$.from = $1;
- $$.to = $5;
- }
- 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;
- $$.offset = $1->value + $2;
- }
- gen:
- type
- {
- $$ = nullgen;
- $$.type = $1;
- }
- | '$' con
- {
- $$ = nullgen;
- $$.type = D_CONST;
- $$.offset = $2;
- }
- | '$' name
- {
- $$ = nullgen;
- {
- Addr *a;
- a = &$$;
- *a = $2;
- }
- if($2.type == D_AUTO || $2.type == D_PARAM)
- yyerror("constant cannot be automatic: %s",
- $2.sym->name);
- $$.type = $2.type | I_ADDR;
- }
- | '$' LSCONST
- {
- $$ = nullgen;
- $$.type = D_SCONST;
- memcpy($$.sval, $2, sizeof($$.sval));
- }
- | '$' LFCONST
- {
- $$ = nullgen;
- $$.type = D_FCONST;
- $$.dval = $2;
- }
- | '$' '-' LFCONST
- {
- $$ = nullgen;
- $$.type = D_FCONST;
- $$.dval = -$3;
- }
- | LTOS '+' con
- {
- $$ = nullgen;
- $$.type = D_STACK;
- $$.offset = $3;
- }
- | LTOS '-' con
- {
- $$ = nullgen;
- $$.type = D_STACK;
- $$.offset = -$3;
- }
- | con
- {
- $$ = nullgen;
- $$.type = D_CONST | I_INDIR;
- $$.offset = $1;
- }
- | '-' '(' LAREG ')'
- {
- $$ = nullgen;
- $$.type = $3 | I_INDDEC;
- }
- | '(' LAREG ')' '+'
- {
- $$ = nullgen;
- $$.type = $2 | I_INDINC;
- }
- | areg
- {
- $$ = nullgen;
- $$.type = $1.type;
- {
- Addr *a;
- a = &$$;
- *a = $1;
- }
- }
- type:
- reg
- | LFREG
- reg:
- LAREG
- | LDREG
- | LTOS
- areg:
- '(' LAREG ')'
- {
- $$.type = $2 | I_INDIR;
- $$.sym = S;
- $$.offset = 0;
- }
- | con '(' LAREG ')'
- {
- $$.type = $3 | I_INDIR;
- $$.sym = S;
- $$.offset = $1;
- }
- | '(' ')'
- {
- $$.type = D_NONE | I_INDIR;
- $$.sym = S;
- $$.offset = 0;
- }
- | con '(' ')'
- {
- $$.type = D_NONE | I_INDIR;
- $$.sym = S;
- $$.offset = $1;
- }
- | name
- name:
- LNAME offset '(' pointer ')'
- {
- $$.type = $4;
- $$.sym = $1;
- $$.offset = $2;
- }
- | LNAME '<' '>' offset '(' LSB ')'
- {
- $$.type = D_STATIC;
- $$.sym = $1;
- $$.offset = $4;
- }
- offset:
- {
- $$ = 0;
- }
- | '+' con
- {
- $$ = $2;
- }
- | '-' con
- {
- $$ = -$2;
- }
- pointer:
- LSB
- | LSP
- | 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;
- }
|