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pascal.y
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pascal.y
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/********************************************************************/
/* */
/* */
/* PARSER */
/* */
/* */
/* */
/********************************************************************/
%{
#include <stdio.h>
#include <string.h>
#include "globals.h"
#include "symbol.h"
#include "stack.h"
#include "tac.h"
#include "stack_interface.h"
SYMBTABLE *st;
SYMBTABLE *main_symbol_table;
SYMBTABLE *constant_symbol_table;
SYMBTABLE *table_pointer;
SYMBTABLE *table_ptr;
#define YYDEBUG 1
DIM_TYPE *dim_p;
PARAM_TYPE *parameter_list;
PARAM_TYPE *param;
SYMB *t;
int offset;
int len;
stack symbol_table_stack;
stack offset_stack;
struct decl_type temp;
int executable_statement_mode = 0;
int parameter_mode = 0;
int param_count = 0;
int block_depth = 0;
int line_count = 1;
int c;
int elements;
int next_tmp = 0;
int next_label = 0;
TAC *program_tac = NULL;
TAC *p_tac1 = NULL;
TAC *p_tac2 = NULL;
int global_nesting_depth = 1;
static void yyerror(char *str){ fprintf(stderr, "pc: %s\n", str); }
%}
%union {
SYMB *symb;
DECL_TYPE decl_type;
DIM_TYPE *dim_type;
TAC *tac;
ENODE *enode;
};
%token AND ARRAY _BEGIN CASE CONST DIV DO DOWNTO ELSE END _FILE
%token FOR FORWARD FUNCTION GOTO IF IN LABEL MOD NIL NOT OF OR
%token PACKED PROCEDURE PROGRAM RECORD REPEAT SET THEN TO TYPE UNTIL
%token VAR WHILE WITH INTEGER REAL NUM
%token ASSIGN NE GE LE DOTDOT print
%token <symb> ID
%token <symb> NUM_INT
%token <symb> NUM_REAL
%token <symb> STRING
%type <symb> main_identifier_list
%type <symb> parameters
%type <symb> optional_parameters
%type <enode> variable
%type <enode> expression
%type <enode> simple_expression
%type <enode> function_expression_list
%type <enode> array_expression_list
%type <enode> term
%type <enode> factor
%type <enode> optional_arguments
%type <enode> argument_list
%type <decl_type> standard_type
%type <decl_type> type
%type <decl_type> declaration_identifier_list
%type <dim_type> dimension_declaration_list
%type <tac> statement
%type <tac> program
%type <tac> optional_declarations
%type <tac> declaration
%type <tac> declarations
%type <tac> subprogram_declaration
%type <tac> subprogram_declarations
%type <symb> subprogram_head
%type <tac> compound_statement
%type <tac> optional_statements
%type <tac> statement_list
%type <tac> procedure_statement
%%
program : M1 PROGRAM ID '(' main_identifier_list ')' ';'
optional_declarations
subprogram_declarations
compound_statement
'.'
{
pop_table(&symbol_table_stack, &table_pointer);
len = strlen($3->name);
table_pointer->name = (char*)malloc(sizeof(char) * len + 1);
strcpy(table_pointer->name, $3->name);
table_pointer->name[len] = '\0';
pop_offset(&offset_stack, &offset);
table_pointer->width = offset;
$3->size = offset;
$3->token_type_1 = T_SELF;
$3->token_type_2 = T_PROGRAM;
$3->data_type = T_UNDEF;
$3->nesting_depth = 1;
TAC *temp1 = join_tac($8, $10);
TAC *temp2 = do_program($3, $5, temp1);
program_tac = join_tac(temp2, $9);
$$ = program_tac;
}
;
M1 :
{
init_stack(&symbol_table_stack);
init_stack(&offset_stack);
constant_symbol_table = mktable(NULL);
table_ptr = mktable(NULL);
main_symbol_table = table_ptr;
len = strlen("CONSTANT SYMBOLS");
constant_symbol_table->name = (char*)malloc(sizeof(char) * len + 1);
strcpy(constant_symbol_table->name, "CONSTANT SYMBOLS");
main_symbol_table->width = 0;
constant_symbol_table->width = 0;
push_table(&symbol_table_stack, table_ptr);
push_offset(&offset_stack, 0);
parameter_mode = 0;
}
;
main_identifier_list : ID
{
$1->token_type_1 = T_PARAM;
$1->token_type_2 = T_FILE;
$1->data_type = T_UNDEF;
$$ = $1;
main_symbol_table->parameters = 1;
}
| main_identifier_list ',' ID
{
$3->token_type_1 = T_PARAM;
$3->token_type_2 = T_FILE;
$3->data_type = T_UNDEF;
main_symbol_table->parameters = main_symbol_table->parameters + 1;
}
;
optional_declarations : declarations
{
$$ = $1;
}
|
{
$$ = NULL;
}
;
declaration_identifier_list
: ',' ID declaration_identifier_list
{
if(parameter_mode == 1)
{ $2->token_type_1 = T_PARAM; param_count++; }
else $2->token_type_1 = T_LOCAL;
if(parameter_mode == 1){
param = get_param();
param->param_symb = $2;
param->next = parameter_list;
parameter_list = param;
}
$$.data_type = $3.data_type;
$$.token_type_1 = $3.token_type_1;
$$.token_type_2 = $3.token_type_2;
$$.size = $2->size = $3.size;
$$.dimensions = $2->dimensions = $3.dimensions;
$$.dimension_list = $2->dimension_list = $3.dimension_list;
$2->line = line_count;
$2->token_type_2 = $3.token_type_2;
if($3.token_type_2 == T_ARRAY){
$2->token_type_2 = $3.token_type_2;
$2->c = $3.c;
$$.c = $3.c;
$2->size = $3.elements * $3.size;
$$.elements = $3.elements;
}
else {
$2->token_type_2 = T_VAR;
$2->size = $3.size;
}
$2->data_type = $3.data_type;
pop_offset(&offset_stack, &offset);
$2->offset = offset;
offset = offset + $2->size;
push_offset(&offset_stack, offset);
if(p_tac1 != NULL){
TAC* temp_tac = declare_var($2);
p_tac1 = join_tac(temp_tac, p_tac1);
}
else{
p_tac1 = declare_var($2);
}
}
| ':' type
{
$$ = $2;
}
;
declaration : ID declaration_identifier_list
{
if(parameter_mode == 1)
{ $1->token_type_1 = T_PARAM; param_count++; }
else $1->token_type_1 = T_LOCAL;
if(parameter_mode == 1){
param = get_param();
param->param_symb = $1;
param->next = parameter_list;
parameter_list = param;
}
$1->line = line_count;
if($2.token_type_2 == T_ARRAY){
$1->token_type_2 = $2.token_type_2;
$1->c = $2.c;
$1->size = $2.elements * $2.size;
}
else {
$1->token_type_2 = T_VAR;
$1->offset = offset;
$1->size = $2.size;
}
$1->data_type = $2.data_type;
$1->dimensions = $2.dimensions;
$1->dimension_list = $2.dimension_list;
pop_offset(&offset_stack, &offset);
$1->offset = offset;
offset = offset + $1->size;
push_offset(&offset_stack, offset);
if(p_tac1 != NULL){
TAC* temp_tac = declare_var($1);
$$ = join_tac(temp_tac, p_tac1);
p_tac1 = NULL;
}
else{
$$ = declare_var($1);
}
}
;
declarations : declarations VAR declaration ';'
{
$$ = join_tac($1, $3);
}
| VAR declaration ';'
{
$$ = $2;
}
;
type : standard_type { $$ = $1; }
| ARRAY dimension_declaration_list ']' OF standard_type
{
$$.token_type_2 = T_ARRAY;
$$.data_type = $5.data_type;
$$.size = $5.size;
$$.elements = $2->node_elements;
DIM_TYPE *temp = $2;
while(temp->next != NULL){
temp = temp->next;
$$.elements *= temp->node_elements;
}
$$.dimensions = $2->dimension;
$$.dimension_list = $2;
$$.c = calculate_c($2, $5.size);
}
;
standard_type : INTEGER
{
$$.data_type = T_INT;
$$.size = SIZEOF_INT;
$$.dimensions = 0;
$$.dimension_list = NULL;
}
| REAL
{
$$.data_type = T_REAL;
$$.size = SIZEOF_REAL;
$$.dimensions = 0;
$$.dimension_list = NULL;
}
;
subprogram_declarations : subprogram_declarations subprogram_declaration
{
$$ = join_tac($1, $2);
}
|
{
$$ = NULL;
}
;
subprogram_declaration : subprogram_head optional_declarations subprogram_declarations compound_statement ';'
{
pop_table(&symbol_table_stack, &table_pointer);
pop_offset(&offset_stack, &offset);
table_pointer->width = offset;
//make a function TAC
if($1->token_type_2 == T_FUNC){
TAC *temp1 = join_tac($2, $4);
//make the param tac list
PARAM_TYPE *temp2 = get_param();
temp2 = $1->parameter_list;
TAC *temp3 = NULL;
TAC *temp4 = NULL;
if(temp2 != NULL){
temp3 = (TAC*)mktac(TAC_ARG, (SYMB*)temp2->param_symb, NULL, NULL);
while(temp2->next != NULL){
temp2 = temp2->next;
temp4 = (TAC*)mktac(TAC_ARG, (SYMB*)temp2->param_symb, NULL, NULL);
temp3 = join_tac(temp4, temp3);
}
}
TAC *temp5 = do_func($1, temp3, temp1);
$$ = join_tac(temp5, $3);
p_tac2 = NULL;
}
//make a procedure TAC
if($1->token_type_2 == T_PROC){
TAC *temp1 = join_tac($2, $4);
//make the param tac list
PARAM_TYPE *temp2 = get_param();
temp2 = $1->parameter_list;
TAC *temp3 = NULL;
TAC *temp4 = NULL;
if(temp2 != NULL){
temp3 = (TAC*)mktac(TAC_ARG, (SYMB*)temp2->param_symb, NULL, NULL);
while(temp2->next != NULL){
temp2 = (PARAM_TYPE*)temp2->next;
temp4 = (TAC*)mktac(TAC_ARG, (SYMB*)temp2->param_symb, NULL, NULL);
temp3 = join_tac(temp4, temp3);
}
}
TAC *temp5 = do_proc($1, temp3, temp1);
$$ = join_tac(temp5, $3);
p_tac2 = NULL;
}
global_nesting_depth--;
}
;
subprogram_head : FUNCTION ID N1 optional_parameters ':' standard_type ';'
{
$2->line = line_count;
$2->token_type_1 = T_SELF;
$2->token_type_2 = T_FUNC;
$2->data_type = $6.data_type;
$2->function_st_ptr = table_ptr;
table_ptr->name = $2->name;
$2->parameter_list = parameter_list;
$2->nesting_depth = global_nesting_depth;
//make the functions label at this time
TAC *label = (TAC*)mktac(TAC_LABEL, (SYMB*)make_label(next_label++), NULL, NULL);
$2->label = label;
//make a local symb for function return value
mkname(table_ptr, $2->name, T_RETURN);
SYMB *t = lookup(table_ptr, $2->name);
t->label = label;
$$ = $2;
}
| PROCEDURE ID N1 optional_parameters ';'
{
$2->line = line_count;
$2->token_type_1 = T_SELF;
$2->token_type_2 = T_PROC;
$2->data_type = T_UNDEF;
$2->function_st_ptr = table_ptr;
table_ptr->name = $2->name;
$2->parameter_list = parameter_list;
$2->nesting_depth = global_nesting_depth;
TAC *label = (TAC*)mktac(TAC_LABEL, (SYMB*)make_label(next_label++), NULL, NULL);
$2->label = label;
$$ = $2;
}
;
N1 :
{
table_ptr = mktable(table_ptr);
push_table(&symbol_table_stack, table_ptr);
push_offset(&offset_stack, offset);
global_nesting_depth++;
parameter_mode = 0;
}
;
optional_parameters : '(' N2 parameters ')'
{
top_table(&symbol_table_stack, &table_pointer);
table_pointer->parameters = param_count;
table_pointer->parameter_list = parameter_list;
parameter_mode = 0;
$$ = $3;
}
|
{
$$ = NULL;
}
;
N2 :
{ parameter_mode = 1; param_count = 0; parameter_list = NULL; }
parameters : parameters ';' declaration
{
$$ = $1;
}
| declaration
{
$$ = $1->a.var;
}
;
compound_statement : _BEGIN M2 optional_statements END M3
{
$$ = $3;
}
;
M2 : { block_depth++; executable_statement_mode = 1; }
M3 : { if(--block_depth == 0) executable_statement_mode = 0; }
optional_statements : statement_list
|
{
$$ = NULL;
}
;
dimension_declaration_list
: dimension_declaration_list ',' NUM_INT DOTDOT NUM_INT
{
DIM_TYPE *dim = (DIM_TYPE*)safe_malloc(sizeof(DIM_TYPE));
$3->int_value = atoi($3->name);
$5->int_value = atoi($5->name);
dim->high = $5->int_value;
dim->low = $3->int_value;
dim->prev = NULL;
dim->next = $$;
dim->node_elements = dim->high - dim->low + 1;
$$->prev = dim;
$$ = dim;
$$->dimension = $$->next->dimension + 1;
}
| '[' NUM_INT DOTDOT NUM_INT
{
DIM_TYPE *dim = (DIM_TYPE*)malloc(sizeof(DIM_TYPE));
dim->dimension = 1;
$2->int_value = atoi($2->name);
$4->int_value = atoi($4->name);
dim->high = $4->int_value;
dim->low = $2->int_value;
dim->prev = NULL;
dim->next = NULL;
dim->node_elements = dim->high - dim->low + 1;
$$ = dim;
}
;
statement_list : statement
| statement_list ';' statement
{
$$ = join_tac($1, $3);
}
;
statement : expression ASSIGN expression
{
if($1->offset == NULL)
$$ = do_assign($1->res, $3);
else
$$ = do_assign_offset($1, $3);
}
| procedure_statement
| compound_statement
| IF expression THEN statement ELSE statement
{
$$ = do_test($2, $4, $6);
}
| WHILE expression DO statement
{
$$ = do_while($2, $4);
}
| print expression
{
$$ = do_print($2);
}
;
procedure_statement : ID optional_arguments
{
$$ = call_proc($1, $2);
}
;
optional_arguments : argument_list ')'
{
$$ = $1;
}
;
argument_list : argument_list ',' expression
{
$1->next = $3;
$$ = $1;
}
| '(' expression
{
$$ = $2;
}
;
function_expression_list : expression
| function_expression_list ',' expression
{
$1->next = $3;
$$ = $1;
}
;
array_expression_list : array_expression_list ',' expression
{
int m = $1->ndim + 1;
int l = limit($1->array, m);
SYMB *limit = (SYMB*)safe_malloc(sizeof(SYMB));
limit->int_value = l;
limit->token_type_2 = T_INT;
TAC *temp1 = (TAC*)mktac(TAC_VAR, (SYMB*)mktmp(), NULL, NULL);
TAC *temp2 = (TAC*)mktac(TAC_MUL, temp1->a.var, $1->res, limit);
TAC *temp3 = (TAC*)mktac(TAC_ADD, temp1->a.var, temp1->a.var, $3->res);
TAC *temp4 = join_tac(temp1, temp2);
TAC *temp5 = join_tac(temp4, temp3);
$$ = make_enode(NULL, temp1->a.var, temp5);
$$->array = $1->array;
$$->ndim = m;
}
| ID '[' expression
{
$$ = make_enode(NULL, $3->res, $3->tac);
$$->array = $1;
$$->ndim = 1;
}
;
expression : simple_expression
| variable
{
if($1->offset == NULL)
$$ = $1;
else{
TAC *temp1 = (TAC*)mktac(TAC_VAR, (SYMB*)mktmp(), NULL, NULL);
TAC *temp2 = (TAC*)mktac(TAC_OFFSET, temp1->a.var, $1->res, $1->offset);
TAC *temp3 = (TAC*)mktac(TAC_VAR, (SYMB*)mktmp(), NULL, NULL);
TAC *temp4 = (TAC*)mktac(TAC_COPY, temp3->a.var, temp1->a.var, NULL);
TAC *temp5 = join_tac(temp1, temp2);
TAC *temp6 = join_tac(temp5, temp3);
TAC *temp7 = join_tac(temp6, temp4);
TAC *temp8 = join_tac($1->tac, temp7);
$$ = make_enode(NULL, temp3->a.var, temp8);
$$->offset = $1->offset;
}
}
| simple_expression '=' simple_expression
{
$$ = do_relop(TAC_EQUAL, $1, $3);
}
| simple_expression NE simple_expression
{
$$ = do_relop(TAC_NE, $1, $3);
}
| simple_expression GE simple_expression
{
$$ = do_relop(TAC_GE, $1, $3);
}
| simple_expression LE simple_expression
{
$$ = do_relop(TAC_LE, $1, $3);
}
| simple_expression '<' simple_expression
{
$$ = do_relop(TAC_LESSTHAN, $1, $3);
}
| simple_expression '>' simple_expression
{
$$ = do_relop(TAC_GRTRTHAN, $1, $3);
}
;
variable : ID
{
$$ = make_enode(NULL, $1, NULL);
$$->offset = NULL;
}
| array_expression_list ']'
{
TAC *temp1 = (TAC*)mktac(TAC_VAR, (SYMB*)mktmp(), NULL, NULL);
ENODE *final = make_enode(NULL, temp1->a.var, NULL);
$$ = final;
SYMB *c = (SYMB*)safe_malloc(sizeof(SYMB));
c->token_type_2 = T_INT;
c->int_value = $1->array->c;
TAC *temp2 = (TAC*)mktac(TAC_COPY, $$->res, c, NULL);
SYMB *width = (SYMB*)safe_malloc(sizeof(SYMB));
if($1->array->data_type == T_INT){
width->token_type_2 = T_INT;
width->int_value = SIZEOF_INT;
}
if($1->array->data_type == T_REAL){
width->token_type_2 = T_REAL;
width->dbl_value = SIZEOF_REAL;
}
TAC *temp3 = (TAC*)mktac(TAC_VAR, (SYMB*)mktmp(), NULL, NULL);
TAC *temp4 = (TAC*)mktac(TAC_MUL, temp3->a.var, $1->res, width);
TAC *temp5 = (TAC*)mktac(TAC_VAR, (SYMB*)mktmp(), NULL, NULL);
TAC *temp6 = (TAC*)mktac(TAC_COPY, temp5->a.var, temp4->a.var, NULL);
TAC *temp7 = join_tac(temp1, temp2);
TAC *temp8 = join_tac(temp7, temp3);
TAC *temp9 = join_tac(temp8, temp4);
TAC *temp10 = join_tac(temp9, temp5);
TAC *temp11 = join_tac(temp10, temp6);
TAC *temp12 = join_tac($1->tac, temp11);
$$->offset = temp5->a.var;
$$->tac = temp12;
}
;
simple_expression : term
| '+' term
{
$$ = do_unary(TAC_POS, $2, table_pointer);
}
| '-' term
{
$$ = do_unary(TAC_NEG, $2, table_pointer);
}
| simple_expression '+' term
{
$$ = do_bin(TAC_ADD, $1, $3, table_pointer);
}
| simple_expression '-' term
{
$$ = do_bin(TAC_SUB, $1, $3, table_pointer);
}
| simple_expression OR term
{
$$ = do_bin(TAC_OR, $1, $3, table_pointer);
}
;
term : factor
| term '*' factor
{
$$ = do_bin(TAC_MUL, $1, $3, table_pointer);
}
| term '/' factor
{
$$ = do_bin(TAC_DIV, $1, $3, table_pointer);
}
| term DIV factor
{
$$ = do_bin(TAC_TDIV, $1, $3, table_pointer);
}
| term MOD factor
{
$$ = do_bin(TAC_MOD, $1, $3, table_pointer);
}
| term AND factor
{
$$ = do_bin(TAC_AND, $1, $3, table_pointer);
}
;
factor : ID
{
$$ = make_enode(NULL, $1, NULL);
}
| ID '(' function_expression_list ')'
{
$$ = call_func($1, $3);
}
| NUM_INT
{
$$ = make_enode(NULL, $1, NULL);
}
| NUM_REAL
{
$$ = make_enode(NULL, $1, NULL);
}
| '(' expression ')'
{
$$ = $2;
}
| NOT factor
{
$$ = do_unary(TAC_NOT, $2, table_pointer);
}
;
%%