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|
%{
#include <stdio.h>
#include <stdbool.h>
#include <stdlib.h>
#include <string.h>
#include <assert.h>
#include "node.h"
#include "ir.h"
static void yyerror(const char*);
int yylex(void);
static enum operator addop_to_oper(const char *op);
static enum operator mulop_to_oper(const char *op);
static enum operator relop_to_oper(const char *op);
static enum operator boolop_to_oper(const char *op);
extern int lineno;
struct node *root_node;
%}
%start start
%token ID NUM INT VOID IF ELSE WHILE FOR RETURN PTR ASM
%token DEREF ADDROF NEGATE NOT ADDOP MULOP RELOP BOOLOP ASSIGN
%token NEWLINE // only sent in asm mode
%token ASMINS0 ASMINS1 ASMINS2 ASMINS_NAME ASMREG ASMVARNAME
%left ASSIGN
%left BOOLOP
%left RELOP
%left ADDOP
%left MULOP
%left NOT NEGATE DEREF ADDROF
%type <id> ID NUM ADDOP MULOP RELOP BOOLOP ASMVARNAME
%type <node> toplevel toplevel_decl var_decl func_decl parameter_list parameter_list_rest
%type <node> parameter block statement statement_list open_statement matched_statement
%type <node> other_statement expression atom_expr expression_list
%type <node> asm_statement_list_terminated asm_statement_list_terminated_trailer asm_statement
%type <type> type INT VOID
%type <instype> ASMINS0 ASMINS1 ASMINS2 ASMINS_NAME
%type <ref> ASMREG asm_arg
%union {
char *id;
struct node *node;
struct type *type;
enum instype instype;
struct ref ref;
}
%destructor { free($$); } <id>
%destructor { node_delete_recursive($$); } <node>
%destructor { irins_delete($$); } <irins>
%%
start: toplevel {
root_node = $1;
} ;
toplevel: toplevel_decl toplevel {
$$ = node_make_2(N_LIST, $1, $2);
}
| toplevel_decl {
$$ = $1;
} ;
toplevel_decl: var_decl | func_decl ;
var_decl: type ID ASSIGN expression ';' {
$$ = node_make_1(N_VAR_DECL_INIT, $4);
$$->rtype = $1;
$$->name = $2;
}
| type ID ';' {
$$ = node_make_0(N_VAR_DECL);
$$->rtype = $1;
$$->name = $2;
} ;
func_decl: type ID '(' parameter_list ')' block {
$$ = node_make_2(N_FUNC_DECL, $4, $6);
$$->rtype = $1;
$$->name = $2;
} ;
type: type PTR { $$ = type_ptr($1); }
| INT { $$ = type_int(16); }
| VOID { $$ = type_void(); } ;
parameter_list: {
$$ = node_make_0(N_LIST_END);
}
| parameter parameter_list_rest {
$$ = node_make_2(N_LIST, $1, $2);
} ;
parameter_list_rest:
{
$$ = node_make_0(N_LIST_END);
}
| ',' parameter parameter_list_rest {
$$ = node_make_2(N_LIST, $2, $3);
} ;
parameter: type ID {
$$ = node_make_0(N_VAR_DECL);
$$->rtype = $1;
$$->name = $2;
} ;
block: '{' '}' {
$$ = node_make_1(N_BLOCK, node_make_0(N_LIST_END));
}
| '{' statement_list '}' {
$$ = node_make_1(N_BLOCK, $2);
} ;
statement_list: statement {
$$ = node_make_2(N_LIST, $1, node_make_0(N_LIST_END));
}
| statement statement_list {
$$ = node_make_2(N_LIST, $1, $2);
} ;
statement: open_statement | matched_statement ;
open_statement: IF '(' expression ')' statement {
$$ = node_make_3(N_IF, $3, $5, node_make_0(N_LIST_END));
}
| IF '(' expression ')' matched_statement ELSE open_statement {
$$ = node_make_3(N_IF, $3, $5, $7);
}
| WHILE '(' expression ')' open_statement {
$$ = node_make_2(N_WHILE, $3, $5);
}
/*| FOR '(' statement ';' expression ';' statement ')' open_statement {
$$ = node_make_1(N_BLOCK,
node_make_list(
$3, node_make_2(N_WHILE, $5, node_make_list($9, $7))));
}*/ ;
matched_statement:
IF '(' expression ')' matched_statement ELSE matched_statement {
$$ = node_make_3(N_IF, $3, $5, $7);
}
| WHILE '(' expression ')' matched_statement {
$$ = node_make_2(N_WHILE, $3, $5);
}
/*| FOR '(' statement ';' expression ';' statement ')' matched_statement {
$$ = node_make_1(N_BLOCK,
node_make_list(
$3, node_make_2(N_WHILE, $5, node_make_list($9, $7))));
}*/
| other_statement ;
other_statement:
var_decl | expression ';' | block
| RETURN ';' {
$$ = node_make_0(N_RETURN);
}
| RETURN expression ';' {
$$ = node_make_1(N_RETURNV, $2);
}
| ASM '{' newlines '}' {
$$ = node_make_0(N_LIST_END);
}
| ASM '{' newlines asm_statement_list_terminated {
$$ = $4;
}
;
expression: atom_expr
| NOT expression { $$ = node_make_1(N_UNOP, $2); $$->oper = OP_NOT; }
| NEGATE expression { $$ = node_make_1(N_UNOP, $2); $$->oper = OP_NEG; }
| DEREF expression { $$ = node_make_1(N_UNOP, $2); $$->oper = OP_DEREF; }
| ADDROF expression { $$ = node_make_1(N_UNOP, $2); $$->oper = OP_ADDROF; }
| expression ADDOP expression {
$$ = node_make_2(N_BINOP, $1, $3);
$$->oper = addop_to_oper($2);
free($2);
}
| expression MULOP expression {
$$ = node_make_2(N_BINOP, $1, $3);
$$->oper = mulop_to_oper($2);
free($2);
}
| expression RELOP expression {
$$ = node_make_2(N_BINOP, $1, $3);
$$->oper = relop_to_oper($2);
free($2);
}
| expression BOOLOP expression {
$$ = node_make_2(N_BINOP, $1, $3);
$$->oper = boolop_to_oper($2);
free($2);
}
| atom_expr ASSIGN expression {
$$ = node_make_2(N_BINOP, $1, $3);
$$->oper = OP_ASSIGN;
} ;
atom_expr: NUM {
$$ = node_make_0(N_NUM);
$$->value = strtol($1, NULL, 10);
free($1);
}
| ID {
$$ = node_make_0(N_VAR);
$$->name = $1;
}
| '(' expression ')' {
$$ = $2;
}
| ID '(' expression_list ')' {
$$ = node_make_1(N_CALL, $3);
$$->name = $1;
}
| atom_expr '[' expression ']' {
$$ = node_make_1(N_UNOP, node_make_2(N_BINOP, $1, $3));
$$->child2->oper = OP_ADD;
$$->oper = OP_DEREF;
} ;
expression_list:
expression {
$$ = node_make_2(N_LIST, $1, node_make_0(N_LIST_END));
}
| expression ',' expression_list {
$$ = node_make_2(N_LIST, $1, $3);
} ;
newlines: |
NEWLINE newlines ;
asm_statement_list_terminated:
asm_statement NEWLINE newlines asm_statement_list_terminated_trailer {
$$ = node_make_2(N_LIST, $1, $4);
}
| asm_statement '}' {
$$ = node_make_2(N_LIST, $1, node_make_0(N_LIST_END));
} ;
asm_statement_list_terminated_trailer:
asm_statement_list_terminated
| '}' {
$$ = node_make_0(N_LIST_END);
} ;
asm_statement: ID ':' {
$$ = node_make_0(N_IRINS);
$$->irins = irins_make_name(INS_LBL, $1);
}
| ASMINS0
{
$$ = node_make_0(N_IRINS);
$$->irins = irins_make($1);
}
| ASMINS1 asm_arg {
$$ = node_make_0(N_IRINS);
struct irins *ins;
switch ($1) {
case INS_NEG: ins = irins_make_01($1, $2, $2); break;
case INS_NOT: ins = irins_make_01($1, $2, $2); break;
case INS_PUSH: ins = irins_make_1($1, $2); break;
case INS_POP: ins = irins_make_0($1, $2); break;
case INS_HWI: ins = irins_make_1($1, $2); break;
default: assert(false);
}
$$->irins = ins;
}
| ASMINS2 asm_arg ',' asm_arg {
$$ = node_make_0(N_IRINS);
struct irins *ins;
switch ($1) {
case INS_ADD: ins = irins_make_012($1, $2, $2, $4); break;
case INS_SUB: ins = irins_make_012($1, $2, $2, $4); break;
case INS_MUL: ins = irins_make_012($1, $2, $2, $4); break;
case INS_DIV: ins = irins_make_012($1, $2, $2, $4); break;
case INS_MOD: ins = irins_make_012($1, $2, $2, $4); break;
case INS_TEST: ins = irins_make_12($1, $2, $4); break;
case INS_CMP: ins = irins_make_12($1, $2, $4); break;
case INS_MOV: ins = irins_make_01($1, $2, $4); break;
default: assert(false);
}
$$->irins = ins;
}
| ASMINS_NAME ID {
$$ = node_make_0(N_IRINS);
$$->irins = irins_make_name($1, $2);
} ;
asm_arg: ASMREG
| NUM {
$$ = ref_imm(strtol($1, NULL, 0));
}
| ASMVARNAME {
$$ = ref_varname($1);
}
| '[' NUM ']' {
$$ = ref_mem(REG_UNUSED, strtol($2, NULL, 0), REFREL_ZERO);
}
| '[' ASMREG ']' {
$$ = ref_mem($2.reg, 0, REFREL_ZERO);
}
| '[' ASMREG '+' NUM ']' {
$$ = ref_mem($2.reg, strtol($4, NULL, 0), REFREL_ZERO);
}
| '[' ASMREG '-' NUM ']' {
$$ = ref_mem($2.reg, -strtol($4, NULL, 0), REFREL_ZERO);
}
%%
static void yyerror(const char *s) {
fprintf(stderr, "Parse error: %s\n", s);
exit(1);
}
static enum operator addop_to_oper(const char *op) {
if (strcmp(op, "+") == 0) return OP_ADD;
else if (strcmp(op, "-") == 0) return OP_SUB;
else assert(false);
}
static enum operator mulop_to_oper(const char *op) {
if (strcmp(op, "*") == 0) return OP_MUL;
else if (strcmp(op, "/") == 0) return OP_DIV;
else if (strcmp(op, "%") == 0) return OP_MOD;
else assert(false);
}
static enum operator relop_to_oper(const char *op) {
if (strcmp(op, "==") == 0) return OP_EQ;
else if (strcmp(op, "!=") == 0) return OP_NEQ;
else if (strcmp(op, "<") == 0) return OP_LT;
else if (strcmp(op, ">") == 0) return OP_GT;
else if (strcmp(op, "<=") == 0) return OP_LEQ;
else if (strcmp(op, ">=") == 0) return OP_GEQ;
else assert(false);
}
static enum operator boolop_to_oper(const char *op) {
if (strcmp(op, "&&") == 0) return OP_AND;
else if (strcmp(op, "||") == 0) return OP_OR;
else assert(false);
}
/* vim:et:ts=4:sw=4
*/
|
