58 lines
1.4 KiB
Text
58 lines
1.4 KiB
Text
%code requires {
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#include <types.h>
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#include <stdio.h>
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#include <stdlib.h>
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extern int yylex(void);
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}
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%{
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#include <types.h>
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#include <stdio.h>
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#include <stdlib.h>
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void yyerror(word_t *result, const char *err) {
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fprintf(stderr, "%s", err);
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}
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int pmem_read(int raddr);
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%}
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%token NUMBER HEX_NUMBER
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%token REGISTER
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%locations
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%start input
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%define api.value.type { word_t }
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%parse-param { uint32_t *result }
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%left '-' '+'
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%left '*' '/'
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%%
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input
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: expression { *result = $1; }
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;
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expression
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: number { $$ = $1; }
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| expression '>' '=' expression { $$ = ($1 >= $4); }
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| expression '<' '=' expression { $$ = ($1 <= $4); }
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| expression '=' '=' expression { $$ = ($1 == $4); }
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| expression '!' '=' expression { $$ = ($1 == $4); }
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| expression '>' expression { $$ = ($1 > $3); }
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| expression '<' expression { $$ = ($1 < $3); }
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| expression '+' expression { $$ = $1 + $3; }
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| expression '-' expression { $$ = $1 - $3; }
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| expression '*' expression { $$ = $1 * $3; }
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| expression '/' expression {
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if($3 == 0) {
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fprintf(stderr, "Error: divide by zero at" FMT_WORD " / " FMT_WORD "\n", $1, $3);
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YYABORT;
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};
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$$ = $1 / $3;
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}
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| '-' number { $$ = -$2; }
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| '*' expression { $$ = pmem_read($2); }
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| '(' expression ')' { $$ = $2; }
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number
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: REGISTER
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| NUMBER
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| HEX_NUMBER
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%%
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