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X0Compiler.final.v2.y
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X0Compiler.final.v2.y
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//声明部分
%{
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include <memory.h>
#include <malloc.h>
#include <ctype.h>
#define bool int
#define true 1
#define false 0
#define MAX_SYM_TABLE 100 /* 符号表容量 */
#define MAX_AL 10 /* 标识符的最大长度 */
#define MAX_ADD 114514 /* 地址上界*/
#define MAX_CODE 200 /* 最多的虚拟机代码数 */
#define MAX_STACK 114514 /* 运行时数据栈元素最多为500个 */
#define MAX_VAL_LEN 114 /*无类型数据长度*/
#define MAX_DATA_STACK 11451 /*数据栈大小*/
#define MAX_ARRAY_DIM 7
enum object {
constant_single,
variable_single,
constant_array,
variable_array,
};
enum data_type_enum {
integer,
boolean,
string_chars,
single_char,
};
struct tablestruct {
char name[MAX_AL];
enum object kind;
int type;
char val[MAX_VAL_LEN];
int adr;
int size;
int array_lable;
int array_dim_size[MAX_ARRAY_DIM];
int init_lable;
}table[MAX_SYM_TABLE];
enum fct {
lit, opr, lod,
sto, lodb, stob,
ini, jmp, jpc,
};
struct instruction {
enum fct f;
int l;
char val[MAX_VAL_LEN];
}code[MAX_CODE];
struct data_stack{
enum data_type_enum t;
char val[MAX_VAL_LEN];
}s[MAX_STACK];
int sym_table_tail = 0; /* 符号表当前尾指针 */
int VM_pointer; /* 虚拟机代码指针, 取值范围[0, cxmax-1] */
char id[MAX_AL];
enum object cur_kind;
char cur_id[MAX_VAL_LEN];
int cur_table_adr;
int cur_type;
int do_begin_pos;
int num;
int curr_address = 3;
int cur_adr;
int stack_top = 2;
int input_val_int;
int becomes_adr;
int adr_shift;
int arr_size;
struct dim_recoder {
int idx_type; // 0 for num, 1 for var_adr
int val;
};
int arr_dim_recoder[MAX_ARRAY_DIM];
int arr_dim_idx = 0;
struct dim_recoder tmp_dim_recoder[MAX_ARRAY_DIM];
int tmp_dim_idx = 0;
int tmp_type_lable;
int ndim_var_lable;
bool input_val_bool;
char input_val_char;
char input_val_string[MAX_VAL_LEN];
bool listall_switch_on = 1; /* 显示虚拟机代码与否 */
bool sym_table_switch_on = 1; /* 显示符号表与否 */
FILE* fin; /* 输入源文件 */
FILE* ftable; /* 输出符号表 */
FILE* fcode; /* 输出虚拟机代码 */
FILE* foutput; /* 输出出错示意（如有错） */
FILE* fresult; /* 输出执行结果 */
FILE* fdatastack;
char fname[MAX_SYM_TABLE];
int err;
extern int line;
void init();
void enter(enum object k);
void gen(enum fct x, int y, char *z);
void listall();
void displaytable();
//void interpret();
int base(int l, int* s, int b);
#define INT_TYPE 101
#define BOOL_TYPE 102
#define CHAR_TYPE 103
#define STRING_TYPE 104
#define INC_OPR 201
#define DEC_OPR 202
#define NOT_OPR 203
#define PLUS_OPR 204
#define MINUS_OPR 205
#define TIMES_OPR 206
#define SLASH_OPR 207
#define MOD_OPR 208
#define AND_OPR 209
#define OR_OPR 210
#define XOR_OPR 211
#define LSS_OPR 212
#define LEQ_OPR 213
#define GTR_OPR 214
#define GEQ_OPR 215
#define EQL_OPR 216
#define NEQ_OPR 217
#define READ_OPR 218
#define WRITE_OPR 219
#define UMINUS_OPR 220
#define ODD_OPR 221
#define OFF_OPR 222
#define POP_OPR 223
#define CASE_EQL_OPR 224
int const_label = 0;
int declaration_init = 0;
%}
//辅助定义部分
%union {
char *ident;
int number;
int boolean;
int type_val;
char *string_chars;
char single_char;
struct {
int sym, dim;
} arr;
struct {
int case_begin;
int case_end;
} case_recorder;
}
%token BOOLSYM BREAKSYM CASESYM CHARSYM CONSTSYM CONTINUESYM DOSYM DEFAULTSYM ELSESYM FORSYM IFSYM INTSYM
%token MAINSYM READSYM REPEATSYM SWITCHSYM STRINGSYM THENSYM UNSIGNEDSYM UNTILSYM WHILESYM WRITESYM RETURNSYM
%token BECOMES LSS LEQ GTR GEQ EQL NEQ PLUS INC MINUS DEC TIMES SLASH MOD LPAREN RPAREN LBRACK
%token RBRACK LBPAREN RBPAREN AND OR NOT XOR COMMA PERIOD COLON SEMICOLON ODDSYM
%right BECOMES
%left AND OR
%left XOR
%left EQL NEQ
%left GTR LSS LEQ GEQ
%left PLUS MINUS
%left TIMES SLASH MOD
%right INC DEC NOT ODDSYM
%nonassoc UMINUS
%nonassoc LOWER_THAN_ELSE
%nonassoc ELSESYM
%token <ident> IDENT
%token <number> NUMBER
%token <string_chars> STRING
%token <single_char> CHAR
%token <boolean> BOOL
%type <type_val> expression if_stat for_stat
%type <type_val> simple_expr additive_expr multiplying_expr term factor
%type <number> binary_bool_opr binary_add_opr binary_mul_opr unary_opr
%type <number> gen_jmp gen_jpc
%type <number> get_code_addr var
%type <number> dimension_list dimension CASESYM
%type <arr> dimension_exp
%type <case_recorder> case_stat
////////////////////////////////////////////////////////
//规则部分
%%
program: MAINSYM
LBPAREN
declaration_list
statement_list
RBPAREN
;
declaration_list: declaration_list declaration_stat
|
;
declaration_stat: var_declaration
| const_declaration
| var_array_declaration
| const_array_declaration
;
var_declaration: type ident_list SEMICOLON
;
const_declaration: CONSTSYM set_const_label
type ident_list {
const_label = 0;
}
SEMICOLON
;
var_array_declaration: type ident_array_list SEMICOLON
;
const_array_declaration: CONSTSYM set_const_label
type ident_array_def {
const_label = 0;
}
SEMICOLON
;
set_const_label: {
const_label = 1;
}
;
ident_array_list: ident_array_def
| ident_array_list COMMA ident_array_def
;
ident_list: ident_def
| ident_list COMMA ident_def
;
ident_array_def: IDENT LBRACK dimension_list RBRACK {
int i = 0, j = arr_dim_idx-1;
arr_size = $3;
stack_top += arr_size;
strcpy(id, $1);
declaration_init = 0;
/*
printf("CHECK POINT in array declaration: %s[", id);
for (i = 0; i < arr_dim_idx; ++i) {
if (i != arr_dim_idx-1) {
printf("%d][", arr_dim_recoder[i]);
}
else {
printf("%d]\n", arr_dim_recoder[i]);
}
}
*/
if (const_label == 1) { // const declaration part
enter(constant_array);
/* need classification for different data type */
}
else {
enter(variable_array);
}
memset(arr_dim_recoder, 0, sizeof(arr_dim_recoder));
arr_dim_idx = 0;
arr_size = 0;
}
;
dimension_list: dimension {
$$ = $1;
arr_dim_recoder[arr_dim_idx++] = $1;
}
| dimension_list RBRACK LBRACK dimension {
$$ = $1 * $4;
arr_dim_recoder[arr_dim_idx++] = $4;
}
;
dimension: NUMBER {
$$ = $1;
}
;
ident_def: IDENT {
if (const_label == 1) { // const declaration without initialization.
yyerror("Const declaration requires initialization!\n", 1001);
return -1; // error code.
}
else { // var declaration part without initialation
declaration_init = 0;
strcpy(id, $1);
enter(variable_single);
stack_top++;
/* need classification for different data type
switch (cur_type) {
case INT_TYPE:
// ... solution
break;
case BOOL_TYPE:
// ... solution
break;
case CHAR_TYPE:
// ... solution
break;
case STRING_TYPE:
// ... solution
break;
}
*/
}
}
| IDENT BECOMES simple_expr {
//printf("current ident type is: %d in ident_def part\n", cur_type);
//printf("current expr type is: %d in ident_def part\n", $3);
if (cur_type != $3) {
yyerror("Mismatched in data type!\n", 1002);
}
declaration_init = 1;
strcpy(id, $1);
if (const_label == 1) { // const declaration part
enter(constant_single);
/* need classification for different data type */
}
else { // var declaration part with initialation
enter(variable_single);
stack_top++;
int id_addr = 0;
enum data_type_enum type_tmp;
for (int i = 1; i <= sym_table_tail; i++) {
if (strcmp($1, table[i].name) == 0) {
id_addr = table[i].adr;
break;
}
}
gen(sto, cur_type, (char*)id_addr);
}
}
;
type: INTSYM {cur_type = INT_TYPE;}
| CHARSYM {cur_type = CHAR_TYPE;}
| STRINGSYM {cur_type = STRING_TYPE;}
| BOOLSYM {
cur_type = BOOL_TYPE;
//printf("BOOL symbol find!\n");
}
;
compound_stat: LBPAREN
statement_list
RBPAREN
;
statement_list: statement_list statement
| statement
;
statement: expression_stat
| compound_stat
| select_stat
| iteration_stat
| read_stat
| write_stat
;
expression_stat: expression_stat COMMA expression SEMICOLON pop_stack
| expression SEMICOLON pop_stack
;
expression: var {
/*
int i, res = -1;
for (i = 1; i <= sym_table_tail; ++i) {
if (strcmp(table[i].name, cur_id) == 0) {
res = table[i].adr;
break;
}
}
//printf("check point\n");
if (res == -1) {
yyerror("Undefined _single!\n");
}
else {
becomes_adr = cur_adr;
}*/
//becomes_adr = cur_adr;
//printf("cur pos is expression_var part, cur_id is %s with adr %d\n", cur_id, becomes_adr);
}
BECOMES expression {
cur_kind = table[$1].kind;
cur_type = table[$1].type;
if (cur_kind == constant_single) {
yyerror("Illegal assignment on constant_single!\n", 1003);
}
//printf("current var type is: %d in expression part\n", cur_type);
//printf("current expr type is: %d in expression part\n", $3);
//printf("current data stack top is: %d\n", *(int*)s[stack_top].val);
//if ($1 != $4) {
// yyerror("Mismatched in data type!\n");
//}
becomes_adr = table[$1].adr;
//printf("check point1 in expression\n");
//printf("cur pos is expression part, cur_adr to sto is: %d\n", becomes_adr);
if (table[$1].array_lable) {
gen(stob, cur_type, (char*)becomes_adr);
}
else {
gen(sto, cur_type, (char*)becomes_adr);
}
//printf("check point2 in expression\n");
$$ = 0; // undefined
}
| simple_expr {
$$ = $1;
}
| {
}
;
pop_stack: {
int opr_tmp = POP_OPR;
gen(opr, 0, (char*)opr_tmp);
}
;
var: IDENT {
strcpy(cur_id, $1);
//printf("current ident is %s in single var.\n", cur_id);
int i, exist_flag = 0;
for (i = 1; i <= sym_table_tail; ++i) {
if (strcmp(cur_id, table[i].name) == 0) {
exist_flag = 1;
cur_table_adr = i;
cur_adr = table[i].adr;
$$ = i;
cur_kind = table[i].kind;
cur_type = table[i].type;
//printf("current pos is var part, cur_id is %s in %d with type %d\n", cur_id, cur_adr, cur_type);
break;
}
}
if (exist_flag == 0) {
yyerror("Undefinded variable_single!\n", 1004);
}
}
| dimension_exp {
$$ = $1.sym;
/*memset(tmp_dim_recoder, 0, sizeof(tmp_dim_recoder));
tmp_dim_idx = 0;
strcpy(cur_id, $1);
printf("current ident is %s in ndim_arr.\n", cur_id);
int i, j, exist_flag = 0;
int tmp_size = 1, adr_shift = 0;
for (i = 1; i <= sym_table_tail; ++i) {
if (strcmp(cur_id, table[i].name) == 0) {
exist_flag = table[i].array_lable;
cur_table_adr = i;
cur_adr = table[i].adr;
//$$ = INT_TYPE;
cur_kind = table[i].kind;
cur_type = table[i].type;
/*
printf("current dim_size arr is: ");
for (j = 0; j < MAX_ARRAY_DIM; ++j) {
printf("%d\t", table[i].array_dim_size[j]);
}
printf("\n");
//printf("current pos is var_ndim part, cur_id is %s in %d with type %d\n", cur_id, cur_adr, cur_type);
break;
}
}
if (exist_flag == 0) {
yyerror("Undefinded variable or non-array variable!\n");
}
ndim_var_lable = 1;
}
dimension_exp RBRACK {
$$ = cur_type;
}*/
}
;
dimension_exp: IDENT LBRACK expression RBRACK {
strcpy(cur_id, $1);
int i, exist_flag = 0;
for (i = 1; i <= sym_table_tail; ++i) {
if (strcmp(cur_id, table[i].name) == 0) {
exist_flag = table[i].array_lable;
break;
}
}
if (!exist_flag) {
yyerror("Undefinded variable or non-array variable!\n", 1005);
}
$$.sym = i;
$$.dim = 1;
}
| dimension_exp {
/*int j;
printf("current dim_size arr is: ");
for (j = 0; j < MAX_ARRAY_DIM; ++j) {
printf("%d ", table[cur_table_adr].array_dim_size[j]);
}
printf("\n");*/
//printf("gen dim_exp lit when tmp_idx is %d and val is %d\n", tmp_dim_idx, table[cur_table_adr].array_dim_size[tmp_dim_idx]);
gen(lit, INT_TYPE, (char*)&(table[$1.sym].array_dim_size[$1.dim]));
gen(opr, 0, TIMES_OPR);
}
LBRACK expression RBRACK {
gen(opr, 0, PLUS_OPR);
$$.sym = $1.sym;
$$.dim = $1.dim+1;
/*
cur_table_adr = $$.sym;
cur_adr = table[$$.sym].adr;
cur_kind = table[$$.sym].kind;
cur_type = table[$$.sym].type;
*/
}
;
select_stat: if_stat
| switch_stat
;
if_stat: IFSYM LPAREN expression RPAREN gen_jpc
statement %prec LOWER_THAN_ELSE {
int back_patch_pos = $5, back_patch_val = VM_pointer;
memcpy((void*)code[back_patch_pos].val, (const void*)&back_patch_val, MAX_VAL_LEN);
}
| IFSYM LPAREN expression RPAREN gen_jpc
statement ELSESYM gen_jmp
statement {
int back_patch_pos_pre = $5, back_patch_val_pre = $8+1;
memcpy((void*)code[back_patch_pos_pre].val, (const void*)&back_patch_val_pre, MAX_VAL_LEN); // for false stat to jump in
int back_patch_pos = $8, back_patch_val = VM_pointer;
memcpy((void*)code[back_patch_pos].val, (const void*)&back_patch_val, MAX_VAL_LEN); // for ture stat to jump out
}
;
switch_stat: SWITCHSYM LPAREN expression RPAREN LBPAREN case_list default_stat RBPAREN {
gen(opr, 0, POP_OPR)
}
;
case_list: case_list case_stat {
//printf("current case_begin is: %d, case_end is %d\n", $2.case_begin, $2.case_end);
int adr_tmp = $2.case_end;
memcpy((void*)code[$2.case_begin].val, (const void*)&adr_tmp, MAX_VAL_LEN);
}
| case_stat {
//printf("current case_begin is: %d, case_end is %d\n", $1.case_begin, $1.case_end);
int adr_tmp = $1.case_end;
memcpy((void*)code[$1.case_begin].val, (const void*)&adr_tmp, MAX_VAL_LEN);
}
;
case_stat: CASESYM expression {
int opr_tmp;
opr_tmp = CASE_EQL_OPR;
gen(opr, 0, (char*)opr_tmp);
$1 = VM_pointer;
opr_tmp = 0;
gen(jpc, 0, (char*)opr_tmp);
}
COLON compound_stat {
$$.case_begin = $1;
$$.case_end = VM_pointer;
}
;
default_stat: DEFAULTSYM COLON compound_stat
;
gen_jpc: {
$$ = VM_pointer;
int adr_tmp = 0;
gen(jpc,0, (char*)adr_tmp);
}
;
gen_jmp: {
$$ = VM_pointer;
int adr_tmp = 0;
gen(jmp,0, (char*)adr_tmp);
}
;
iteration_stat: for_stat
| while_stat
| do_while_stat
| repeat_stat
;
for_stat: FORSYM LPAREN expression SEMICOLON get_code_addr
expression SEMICOLON get_code_addr {
int opr_tmp = 0;
gen(jpc, 0, (char*)opr_tmp); // false --- jump out
gen(jmp, 0, (char*)opr_tmp); // true --- jump to statement
}
get_code_addr expression RPAREN {
int adr_tmp = $5;
gen(jmp, 0, (char*)adr_tmp); // back to condition part
}
get_code_addr
statement {
int adr_tmp = $10, adr_jpc_e2, adr_jpc_e2_pos = $8, adr_jmp_e2 = $14;
gen(jmp, 0, (char*)adr_tmp);
adr_jpc_e2 = VM_pointer;
memcpy((void*)code[adr_jpc_e2_pos].val, (const void*)&adr_jpc_e2, MAX_VAL_LEN);
memcpy((void*)code[adr_jpc_e2_pos+1].val, (const void*)&adr_jmp_e2, MAX_VAL_LEN);
}
;
while_stat: WHILESYM LPAREN get_code_addr expression RPAREN get_code_addr {
int opr_tmp = 0;
gen(jpc, 0, (char*)opr_tmp);
}
statement {
int while_begin_pos = $3, while_jmp_pos = $6, while_back_patch_pos;
gen(jmp, 0, (char*)while_begin_pos);
while_back_patch_pos = VM_pointer;
memcpy((void*)code[while_jmp_pos].val, (const void*)&while_back_patch_pos, MAX_VAL_LEN);
}
;
repeat_stat: REPEATSYM get_code_addr statement UNTILSYM LPAREN expression RPAREN SEMICOLON {
gen(jpc, 0, $2);
}
;
get_code_addr: {$$ = VM_pointer};
do_while_stat: DOSYM {
do_begin_pos = VM_pointer;
}
statement
WHILESYM LPAREN
expression
RPAREN SEMICOLON {
int opr_tmp = 0;
gen(jpc, 0, (char*)opr_tmp); // jump out
gen(jmp, 0, (char*)do_begin_pos); // back to begin part
memcpy((void*)code[VM_pointer - 2].val, (const void*)&VM_pointer, MAX_VAL_LEN); // complete jump out adr
}
;
read_stat: READSYM LPAREN read_list RPAREN SEMICOLON
;
read_list: read_list COMMA read_var
| read_var
;
read_var: var {
if (cur_kind == constant_single || cur_kind == constant_array) {
yyerror("Operation on contant data!\n", 1006);
}
gen(opr, cur_type, (char*)READ_OPR); // OPR undefined;
cur_adr = table[$1].adr;
if (table[$1].array_lable) {
gen(stob, cur_type, (char*)cur_adr);
int opr_tmp = POP_OPR;
gen(opr, 0, (char*)opr_tmp);
}
else {
gen(sto, cur_type, (char*)cur_adr);
int opr_tmp = POP_OPR;
gen(opr, 0, (char*)opr_tmp);
}
}
;
write_stat: WRITESYM LPAREN write_list RPAREN SEMICOLON
;
write_list: write_list COMMA expression {
int opr_tmp = WRITE_OPR;
gen(opr, 0, (char*)opr_tmp);
}
| expression {
int opr_tmp = WRITE_OPR;
gen(opr, 0, (char*)opr_tmp);
}
;
simple_expr: additive_expr {
$$ = $1;
}
| simple_expr binary_bool_opr additive_expr {
$$ = BOOL_TYPE;
int opr_tmp = $2;
gen(opr, 0, (char*)opr_tmp);
}
;
additive_expr: additive_expr binary_add_opr multiplying_expr {
$$ = $1;
int opr_tmp = $2;
gen(opr, 0, (char*)opr_tmp);
}
| multiplying_expr {
$$ = $1;
}
;
multiplying_expr: multiplying_expr binary_mul_opr term {
$$ = $1;
int opr_tmp = $2;
gen(opr, 0, (char*)opr_tmp);
}
| term {
$$ = $1;
}
;
term: factor {
$$ = $1;
}
| unary_opr term {
$$ = $2;
int opr_tmp = $1 + 3;
printf("current opr in unary_opr term is: %d\n", opr_tmp);
//opr_tmp = (opr_tmp == INC_OPR ? PLUS_OPR : MINUS_OPR);
int tmp_num = 1;
gen(lit, INT_TYPE, (char*)&tmp_num);
gen(opr, 0, (char*)opr_tmp);
if (table[cur_table_adr].array_lable) {
gen(stob, cur_type, (char*)cur_adr);
gen(lit, INT_TYPE, (char*)&cur_table_adr);
gen(lodb, cur_type, (char*)cur_adr);
}
else {
gen(sto, cur_type, (char*)cur_adr);
gen(lod, cur_type, (char*)cur_adr);
}
//gen(lit, 0, (char*)tmp_num);
}
| MINUS factor %prec UMINUS {
$$ = $2;
int opr_tmp = UMINUS_OPR;
gen(opr, 0, (char*)opr_tmp);
}
| NOT factor {
$$ = BOOL_TYPE;
int opr_tmp = NOT_OPR;
gen(opr, 0, (char*)opr_tmp);
}
| ODDSYM factor {
$$ = BOOL_TYPE;
int opr_tmp = ODD_OPR;
gen(opr, 0, (char*)opr_tmp);
}
;
factor: NUMBER {
$$ = INT_TYPE;
input_val_int = $1;
//printf("factor part input val(int) is: %d\n", input_val_int);
gen(lit, INT_TYPE, (char*)&input_val_int);
}
| BOOL {
$$ = BOOL_TYPE;
input_val_bool = $1;
//printf("factor part input val(bool) is: %d\n", input_val_bool);
gen(lit, BOOL_TYPE, (char*)&input_val_bool);
}
| STRING {
$$ = STRING_TYPE;
strcpy(input_val_string, $1);
//input_val_string[strlen(input_val_string)-1] = '\0';
//printf("factor part input val(string) is: %s\n", input_val_string);
gen(lit, STRING_TYPE, &input_val_string);
}
| CHAR {
$$ = CHAR_TYPE;
input_val_char = $1;
//printf("factor part input val(char) is: %c\n", input_val_char);
gen(lit, CHAR_TYPE, (char*)&input_val_char);
}
| var {
cur_table_adr = $1;
cur_adr = table[$1].adr;
cur_kind = table[$1].kind;
if (cur_kind == constant_single) {
gen(lit, cur_type, table[cur_table_adr].val);
}
else if (cur_kind == variable_single){
// Maybe refresh the data_stack val is required.
gen(lod, cur_type, (char*)cur_adr);
}
else {
gen(lit, INT_TYPE, (char*)&cur_table_adr);
gen(lodb, cur_type, (char*)cur_adr);
}
ndim_var_lable = 0;
}
| LPAREN expression RPAREN {
$$ = $2;
}
;
binary_add_opr: PLUS {
$$ = PLUS_OPR;
}
| MINUS {
$$ = MINUS_OPR;
}
;
binary_mul_opr: TIMES {
$$ = TIMES_OPR;
}
| SLASH {
$$ = SLASH_OPR;
}
| MOD {
$$ = MOD_OPR;
}
;
binary_bool_opr: AND {
$$ = AND_OPR;
}
| OR {
$$ = OR_OPR;
}
| XOR {
$$ = XOR_OPR;
}
| LSS {
$$ = LSS_OPR;
}
| LEQ {
$$ = LEQ_OPR;
}
| GTR {
$$ = GTR_OPR;
}
| GEQ {
$$ = GEQ_OPR;
}
| EQL {
$$ = EQL_OPR;
}
| NEQ {
$$ = NEQ_OPR;
}
;
unary_opr: INC {
$$ = INC_OPR;
}
| DEC {
$$ = DEC_OPR;
}
;
////////////////////////////////////////////////////////
//程序部分
%%
int yyerror(char *s, int error_num) {
err = err + 1;
printf("%d: %s in line %d\n", error_num, s, line);
fprintf(foutput, "%d: %s in line %d\n", error_num, s, line);
return 0;
}
/* 初始化 */
void init() {
sym_table_tail = 0;
VM_pointer = 0;
num = 0;
err = 0;
input_val_int = 0;
input_val_bool = 0;
input_val_char = 0;
strcpy(input_val_string, "\0");
}
/* 在符号表中加入一项 */
void enter(enum object k) {
int i;
char data_type_name[][15]= {
{"integer"},{"boolean"},{"string_chars"},{"single_char"},
};
sym_table_tail++;
strcpy(table[sym_table_tail].name, id);
table[sym_table_tail].kind = k;
table[sym_table_tail].init_lable = declaration_init;
table[sym_table_tail].type = cur_type;
//printf("current pos is enter part, the input id is: %s with declaration_init: %d, cur_type: %d\n", id, declaration_init, cur_type);
//printf("%d:\t%d\t%s\t%d\t%d\n", sym_table_tail, k_kind, id, k_type, declaration_init);
switch(k) {
case constant_single:
switch (cur_type) {
case INT_TYPE:
memcpy((void*)&table[sym_table_tail].val, (const void*)&input_val_int, MAX_VAL_LEN);
//table[sym_table_tail].adr = curr_address++;
break;
case BOOL_TYPE:
memcpy((void*)&table[sym_table_tail].val, (const void*)&input_val_bool, MAX_VAL_LEN);
//table[sym_table_tail].adr = curr_address++;
break;
case CHAR_TYPE:
memcpy((void*)&table[sym_table_tail].val, (const void*)&input_val_char, MAX_VAL_LEN);
//table[sym_table_tail].adr = curr_address++;
break;
case STRING_TYPE:
memcpy((void*)&table[sym_table_tail].val, (const void*)&input_val_string, MAX_VAL_LEN);
//table[sym_table_tail].adr = curr_address++;
break;
default:
printf("Unknown data type in constant_single enter part!");
}
break;
case constant_array:
table[sym_table_tail].array_lable = 1;
break;
case variable_single:
//printf("variable_single entered!\n");
switch (cur_type) {
case INT_TYPE:
if (declaration_init) {
memcpy((void*)&table[sym_table_tail].val, (const void*)&input_val_int, MAX_VAL_LEN);
}
table[sym_table_tail].adr = curr_address++;
break;
case BOOL_TYPE:
if (declaration_init) {
memcpy((void*)&table[sym_table_tail].val, (const void*)&input_val_bool, MAX_VAL_LEN);
}
table[sym_table_tail].adr = curr_address++;
break;
case CHAR_TYPE:
if (declaration_init) {
memcpy((void*)&table[sym_table_tail].val, (const void*)&input_val_char, MAX_VAL_LEN);
}
table[sym_table_tail].adr = curr_address++;
break;
case STRING_TYPE:
if (declaration_init) {
memcpy((void*)&table[sym_table_tail].val, (const void*)&input_val_string, MAX_VAL_LEN);
}
table[sym_table_tail].adr = curr_address++;
break;
default:
printf("Unknown data type in variable_single enter part!");
}
break;
case variable_array:
table[sym_table_tail].array_lable = 1;
table[sym_table_tail].adr = curr_address;
table[sym_table_tail].size = arr_size;
for (i = 0; i < MAX_ARRAY_DIM; ++i) {
table[sym_table_tail].array_dim_size[i] = arr_dim_recoder[i];
}
curr_address += arr_size;
printf("current vatiable defination is a n_dim variable with length %d\n", arr_size);
break;
default:
yyerror("Unknown kind occured in enter!\n", 1007);
}
}
/* 查找标识符在符号表中的位置 */
int position(char *s) {
int i, res = -1;
for (i = 1; i <= sym_table_tail; ++i) {
if (strcmp(table[i].name, s) != 0) {
res = table[i].adr;
break;
}