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parser.y
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/* ===== Definition Section ===== */
%{
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include <assert.h>
#include "header.h"
int linenumber = 1;
int scope=0;
int STRUCT_DEC=0;
int FUNC=0;
TYPE func_return;
int STRUCT_P;
int IS_RETURN=0;
int GLOBAL_ERROR;
#define STRING_CONST 5
int ISERROR=0;
int ARoffset;
char function_name[MAXLEN];
//char* frame_data = NULL;
//int GLOBAL_DECLS_STARTED=0;
int LABEL_NUM=0;
int BOOL_LABEL_NUM=0;
int float_number=0, string_number=0;
void VerifyMainCall();
%}
%union{
char *lexeme;
CON_Type *const1;
int intval;
TYPE Type;
char * xst;
ArrayInfo *arr_info;
id_list *P_id_l;
var_decl *P_var_d;
init_id *P_ini_i;
def_list *P_def_l;
TypeList * P_typ_l;
var_ref * P_var_r;
param *P_par;
param_list *plist;
};
%token <lexeme>ID
%token <const1>CONST
%token VOID
%token INT
%token FLOAT
%token IF
%token ELSE
%token WHILE
%token FOR
%token STRUCT
%token TYPEDEF
%token OP_ASSIGN
%token OP_OR
%token OP_AND
%token OP_NOT
%token OP_EQ
%token OP_NE
%token OP_GT
%token OP_LT
%token OP_GE
%token OP_LE
%token OP_PLUS
%token OP_MINUS
%token OP_TIMES
%token OP_DIVIDE
%token MK_LB
%token MK_RB
%token MK_LPAREN
%token MK_RPAREN
%token MK_LBRACE
%token MK_RBRACE
%token MK_COMMA
%token MK_SEMICOLON
%token MK_DOT
%token ERROR
%token RETURN
%type <xst> struct_tail tag opt_tag struct_type
%type <P_typ_l> relop_expr_list nonempty_relop_expr_list
%type <intval> mul_op add_op rel_op type cfactor mcexpr cexpr
%type <Type> nonempty_assign_expr_list assign_expr_list stmt stmt_list type_decl decl decl_list block function_decl global_decl global_decl_list program
%type <P_id_l> id_list init_id_list
%type <arr_info> dim_decl dim_fn dimfn1
%type <P_var_d> var_decl def
%type <P_ini_i> init_id
%type <P_var_r> var_ref dim factor term expr relop_factor relop_term relop_expr assign_expr test expr_null or_list and_list
/*except NT var_ref the other NT's do not need the name field but the same structure is used*/
%type <P_par> param
%type <P_def_l> def_list
%type <plist> param_list
%start program
%%
/* ==== Grammar Section ==== */
/* Productions */ /* Semantic actions */
program : global_decl_list{
if ($1==ERROR_ || GLOBAL_ERROR) {
printf("error: Semantic Analysis failed due to errors\n");
yyerror("");
}
else VerifyMainCall(); }
;
global_decl_list: global_decl_list global_decl{$$=($2==ERROR_)?ERROR_:$1;}
|{$$=ZERO_;}
;
global_decl : decl_list function_decl{$$=(($1==ERROR_)||($2==ERROR_))?ERROR_:ZERO_;}
| function_decl{$$=$1;}
;
function_decl : type ID MK_LPAREN {scope++;IS_RETURN=0;} param_list {$<Type>$=func_enter_ST($1,$2,$5);func_return=$1;} MK_RPAREN
{
ARoffset=-4;
gen_head($2);
gen_prologue($2);
}
MK_LBRACE block MK_RBRACE {delete_scope(scope);scope--;$$=((check_return(IS_RETURN,$1)==ERROR_)||($<Type>6==ERROR_)||($10==ERROR_))?ERROR_:ZERO_;
gen_epilogue($2);
}
| struct_type ID MK_LPAREN {printf("error %d: functions do not return structs in C--\n",linenumber);scope++;IS_RETURN=0;} param_list {func_enter_ST(STR_,$2,$5);func_return=ERROR_;}MK_RPAREN MK_LBRACE block MK_RBRACE{delete_scope(scope);scope--;$$=ERROR_;}
| VOID ID MK_LPAREN {scope++;IS_RETURN=0;} param_list {$<Type>$=func_enter_ST(VOID_,$2,$5);func_return=VOID_;}MK_RPAREN
{
ARoffset=-4;
gen_head($2);
gen_prologue($2);
}
MK_LBRACE block MK_RBRACE{delete_scope(scope);scope--;$$=(($<Type>6==ERROR_)||($10==ERROR_))?ERROR_:ZERO_;
gen_epilogue($2);
}
| type ID MK_LPAREN MK_RPAREN {$<Type>$=func_enter_ST($1,$2,NULL);func_return=$1;
ARoffset=-4;
gen_head($2);
gen_prologue($2);
}MK_LBRACE{scope++;IS_RETURN=0;} block MK_RBRACE{delete_scope(scope);scope--;$$=((check_return(IS_RETURN,$1)==ERROR_)||($<Type>5==ERROR_)||($8==ERROR_))?ERROR_:ZERO_;
gen_epilogue($2);
}
| struct_type ID MK_LPAREN MK_RPAREN MK_LBRACE{printf("error %d: functions do not return structs in C--\n",linenumber);scope++;IS_RETURN=0;func_enter_ST(STR_,$2,NULL);func_return=ERROR_;} block MK_RBRACE{delete_scope(scope);scope--;$$=ERROR_;}
| VOID ID MK_LPAREN MK_RPAREN MK_LBRACE {scope++;IS_RETURN=0;$<Type>$=func_enter_ST(VOID_,$2,NULL);func_return=VOID_;
ARoffset=-4;
gen_head($2);
gen_prologue($2);
}block MK_RBRACE{delete_scope(scope);scope--;$$=(($<Type>6==ERROR_)||($7==ERROR_))?ERROR_:ZERO_;
gen_epilogue($2);
}
;
param_list : param_list MK_COMMA param{$$=MakeParamList($1,$3);}
| param {$$=MakeParamList(NULL,$1);}
;
param : type ID{
param* PP;
PP=Allocate(PARAM);
PP->type=$1;
PP->name = $2;
if(param_P(PP,$2)==ERROR_)
$$=NULL;
else
$$=PP;
}
| struct_type ID{
printf("error %d: struct can not be passed as parameter\n",linenumber);
$$=NULL;
}
| type ID dim_fn{
if($3==NULL)
$$=NULL;
else{
param* PP;
PP=Allocate(PARAM);
PP->type=ARR_;
PP->arrtype=$1;
PP->name = $2;
PP->dim=$3->dim;
if(param_P(PP,$2)==ERROR_)
$$=NULL;
else
$$=PP;
}
}
| struct_type ID dim_fn {
printf("error %d: struct can not be passed as parameter\n",linenumber);
$$=NULL;
}
;
dim_fn :MK_LB expr_null MK_RB dimfn1{
if($2!=NULL&&$2->type!=INT_){
printf("error %d: non integer type in dimension declaration\n",linenumber);
$$=NULL;
}
else
{
$4->dim = $4->dim+1;
$$ = $4; }
}
;
dimfn1 :MK_LB expr MK_RB dimfn1{
if($2->type!=INT_){
printf("error %d: non integer type in dimension declaration\n",linenumber);
$$=NULL;
}
else{
$4->dim = $4->dim+1;
$$ = $4; }
}
|
{
ArrayInfo *temp;
temp = (ArrayInfo*)malloc(sizeof(ArrayInfo));
temp->dim = 0;
$$ = temp; }
;
expr_null :expr{$$=$1;}
|{$$=NULL;}
;
block : decl_list stmt_list {$$=(($1==ERROR_)||($2==ERROR_))?ERROR_:ZERO_;}
| stmt_list
| decl_list{$$=$1;}
|{$$=ZERO_;}
;
decl_list : decl_list decl{if($2==ERROR_)$$=$2;else $$=$1;}
| decl{$$=$1;}
;
decl : type_decl {$$=$1;}
| var_decl{
$$=decl_enter_ST($1);
}
;
type_decl : TYPEDEF type id_list MK_SEMICOLON{
$$=type_decl_enter_ST1($2,$3);
}
| TYPEDEF VOID id_list MK_SEMICOLON{$$=ZERO_;}
| TYPEDEF struct_type id_list MK_SEMICOLON{
if(if_user_name($2)){
printf("error %d: cannot have a tag in typedef struct \n",linenumber);
$$=ERROR_;
}
else
$$=ZERO_;
type_decl_enter_ST2($2,$3);
}
| struct_type MK_SEMICOLON{
printf("error %d: struct declaration with no variables\n",linenumber);
$$=ERROR_;
}
;
var_decl : type init_id_list MK_SEMICOLON{
$$=Allocate(VAR_DECL);
$$->linnum=linenumber;
$$->P_id_l=$2;
$$->type=$1;
$$->type_name=NULL;
if(scope!=0)
ARoffset = set_offset($$, ARoffset);
else
set_global($$);
}
| struct_type id_list MK_SEMICOLON{
$$=Allocate(VAR_DECL);
symtab *STP;
if($1==NULL)
$$->type=ERROR_;
else{
$$->linnum=linenumber;
$$->P_id_l=$2;
$$->type=STR_VAR_;
if(STRUCT_P==1)
$$->type_name=$1;
else{
printf("error %d: cannot have `struct tag' declarations\n",linenumber);
$$->type=ERROR_;
}
}
}
| ID id_list MK_SEMICOLON {
symtab *STP;
init_id * PII;
id_list * PIL;
char *name;
$$=Allocate(VAR_DECL);
if((STP=lookup($1))==NULL){
printf("error %d: undeclared type %s\n",linenumber,$1);
$$->type=ERROR_;
$$->P_id_l=$2;
$$->linnum=linenumber;
}
else if(STP->type!=TYPEDEF_){
printf("error %d: %s not a type\n",linenumber,$1);
$$->type=ERROR_;
$$->P_id_l=$2;
$$->linnum=linenumber;
}
else{
switch(STP->type_when_def){
case TYPEDEF_INT:
$$->type=INT_;
$$->type_name=NULL;
break;
case TYPEDEF_FLT:
$$->type=FLOAT_;
$$->type_name=NULL;
break;
case TYPEDEF_ARR:
PIL=$2;
$$->type=STP->symtab_u.st_arr->arrtype;
if(STP->symtab_u.st_arr->arrtype==STR_)
$$->type_name=STP->symtab_u.st_arr->type_name;
do{
PII=$2->P_ini_i;
switch(PII->type){
case ARR_:
PII->init_id_u.P_arr_s->arr_info->dim+=STP->symtab_u.st_arr->dim;
break;
default:
PII->type=ARR_;
name=PII->init_id_u.name;
PII->init_id_u.P_arr_s=Allocate(ARRAY_SEM);
PII->init_id_u.P_arr_s->arr_info=Allocate(TYPE_ARR);
PII->init_id_u.P_arr_s->arr_info->dim=STP->symtab_u.st_arr->dim;
PII->init_id_u.P_arr_s->name=name;
break;
}
}while(PIL=PIL->next);
break;
case TYPEDEF_STR:
$$->type=STR_VAR_;
$$->type_name=STP->symtab_u.type_name;
break;
}
$$->linnum=linenumber;
$$->P_id_l=$2;
}
}
;
type : INT{$$=INT_;}
| FLOAT{$$=FLOAT_;}
;
struct_type : STRUCT opt_tag MK_LBRACE {STRUCT_DEC++;} def_list {STRUCT_DEC--;}MK_RBRACE{
if(!struct_type_P($2,$5))
$$=NULL;
else
$$=$2;
STRUCT_P=1;
}
| STRUCT tag{
$$=$2;
STRUCT_P=2;
}
;
def_list : def_list def{$$=def_list_P($1,$2);}
|{$$=NULL;}
;
def : var_decl {$$=$1;}
;
opt_tag : tag
{ if($1!=NULL)
printf("error %d: tags are not supported by C--\n",linenumber);
$$=get_temp_name();
}
| {$$=get_temp_name();}/* empty */
tag : ID{$$=$1;}
id_list : ID{$$=Create_Id_List($1);}
| id_list MK_COMMA ID{$$=Merge_Id_List($1,$3);}
| id_list MK_COMMA ID dim_decl{$$=Id_List_Array($1,$3,$4);}
| ID dim_decl{$$=Id_List_Array(NULL,$1,$2);}
;
dim_decl : MK_LB cexpr MK_RB
{
ArrayInfo* temp;
if ($2 <= 0) {
yyerror("");
printf("Invalid dimension declaration %d \n", $2); }
else {
temp = (ArrayInfo*)malloc(sizeof(ArrayInfo));
temp->dim = 1;
temp->dim_limit[0] = $2;
$$ = temp; }
}
| dim_decl MK_LB cexpr MK_RB
{
if ($1->dim == 10 || ($3 <= 0) )
{ /* Limit reached */
yyerror("");
printf("Invalid dimension declaration \n"); }
else {
$1->dim_limit[$1->dim] = $3;
$1->dim +=1;
$$ = $1;
}
}
;
cexpr : cexpr OP_PLUS mcexpr{ $$=$1+$3;}
| cexpr OP_MINUS mcexpr {$$=$1-$3;}
| mcexpr{$$=$1;}
;
mcexpr : mcexpr OP_TIMES cfactor {$$=$1*$3; }
| mcexpr OP_DIVIDE cfactor {
if ($3 == 0) printf("ERROR\n");
if (($1 % $3) != 0) printf("ERROR\n");
$$=$1/$3;
}
| cfactor {$$=$1;}
;
cfactor: CONST{
if($1->const_type!=INTEGERC){
printf("error %d: non integer expression in array dimension\n",linenumber);
$$=ERROR_;
}
else
{
$$=$1->const_u.intval;
}
}
|MK_LPAREN cexpr MK_RPAREN{$$=$2;}
;
init_id_list : init_id{
$$=Allocate(ID_LIST);
$$->P_ini_i=$1;
$$->next=NULL;
}
| init_id_list MK_COMMA init_id{
/*append at the beginging of list, need not preserve order*/
id_list * PIL;
PIL=Allocate(ID_LIST);
PIL->next=$1;
PIL->P_ini_i=$3;
$$=PIL;
}
;
init_id : ID{
$$=Allocate(INIT_ID);
$$->initial_type=0;
$$->init_id_u.name=$1;
$$->type=ZERO_; /*type is not known at this point
so we give non error type here.
should be checked above.*/
}
| ID dim_decl{
int i,j;
$$=Allocate(INIT_ID);
$$->type=ARR_; /*we know this is array decl*/
$$->init_id_u.P_arr_s=Allocate(ARRAY_SEM);
$$->init_id_u.P_arr_s->arr_info=Allocate(TYPE_ARR);
$$->init_id_u.P_arr_s->name=$1;
$$->init_id_u.P_arr_s->arr_info->dim=$2->dim;
for (j=0, i=1; j< 10; j++)
$$->init_id_u.P_arr_s->arr_info->dim_limit[j] = $2->dim_limit[j];
}
| ID OP_ASSIGN relop_expr{
$$=Allocate(INIT_ID);
$$->initial_type=1;
if(STRUCT_DEC){
printf("error %d:assignment to variable %s in struct definition\n",linenumber,$1);
$$->type=ERROR_;
}
else{
if($3->type!=INT_&&$3->type!=FLOAT_){
printf("error %d: initialization of variable %s with expression of type %s\n",linenumber,$1,printtype($3->type));
$$->type=ERROR_;
}
else
{
$$->type=$3->type;
if($$->type == INT_)
{
$$->value.value_int=$3->const_value.const_int;
$$->place=$3->place;
}
else
{
$$->value.value_float=$3->const_value.const_float;
$$->place=$3->place;
}
}
}
$$->init_id_u.name=$1;
}
;
stmt_list : stmt_list stmt{
if($2==ERROR_)
$$=ERROR_;
else
$$=$1;
}
| stmt{$$=$1;}
;
stmt : MK_LBRACE {scope++;}block {delete_scope(scope);scope--;}MK_RBRACE{$$=$3;}
| WHILE MK_LPAREN test {
if(($3->type!=INT_)&&($3->type!=FLOAT_)){
printf("error %d: condition not a basic type in while statement\n",linenumber);
}}MK_RPAREN stmt{
if($6==ERROR_) $$=$6;
else
{
gen_control_while($3->label_num);
gen_control_endlabel($3->label_num);
}
}
| FOR MK_LPAREN assign_expr_list MK_SEMICOLON test
{
printf("\tj\t_ForBody%d\n", $5->label_num);
printf("_Increment%d:\n", $5->label_num);
}
MK_SEMICOLON assign_expr_list MK_RPAREN
{
gen_control_while($5->label_num);
printf("_ForBody%d:\n", $5->label_num);
}
stmt
{
if($3==ERROR_)
$$=ERROR_;
else if(($5->type!=INT_)&&($5->type!=FLOAT_))
$$=ERROR_;
else if($8==ERROR_)
$$=ERROR_;
else
{
$$=$8;
printf( "\tj\t_Increment%d\n", $5->label_num);
gen_control_endlabel($5->label_num);
}
}
| var_ref OP_ASSIGN relop_expr MK_SEMICOLON
{
$$=stmt_assign_ex($1,$3);
print_regs;
}
| IF MK_LPAREN test MK_RPAREN stmt{
if(($3->type!=INT_)&&($3->type!=FLOAT_)){
printf("error %d: condition not a basic type in if statement\n",linenumber);
$$=ERROR_;
}
else
{
$$=$5;
gen_control_endlabel($3->label_num);
}
}
| IF MK_LPAREN test MK_RPAREN stmt ELSE
{
gen_control_jump_else($3->label_num);
gen_control_endlabel($3->label_num);
}
stmt{
if(($3->type!=INT_)&&($3->type!=FLOAT_)){
printf("error %d: condition not a basic type in if statement\n",linenumber);
$$=ERROR_;
}
else
{
$$=(($5==ERROR_)||($8==ERROR_))?ERROR_:ZERO_;
gen_control_else($3->label_num);
}
}
| ID MK_LPAREN relop_expr_list MK_RPAREN MK_SEMICOLON{
var_ref *PVR;
if ((strcmp($1,"write") == 0) ||
(strcmp($1,"WRITE") == 0)) {
if($3==NULL){
printf("error %d: too few arguments to function write\n",linenumber);
$$=ERROR_;
}
if ($3->next !=NULL) {
printf("error %d: too many arguments to function write\n",linenumber);
$$=ERROR_;
}
else if($3->P_var_r->type!=INT_
&& $3->P_var_r->type!=FLOAT_
&& $3->P_var_r->type!=STRING_){
printf("error %d: wrong type of argument %s to write\n",linenumber,printtype($3->P_var_r->type));
$$=ERROR_;
}
else
{
gen_write($3);
$$=ZERO_;
}
}
else if((strcmp($1,"read")==0)||(strcmp($1,"READ")==0))
{
gen_read();
$$=INT_;
}
else if (strcmp($1,"fread")==0)
{
gen_read_float();
$$=FLOAT_;
}
else
{
PVR=check_function($1,$3);
gen_function($1);
gen_pop_params($3);
$$=PVR->type;
}
}
| MK_SEMICOLON{$$=ZERO_;printf("empty\n");}
| RETURN MK_SEMICOLON{
if((func_return!=ERROR_)&&(func_return!=VOID_)){
printf("error %d: returning nothing from function expecting to return %s\n",linenumber,printtype(func_return));
$$=ERROR_;
}
else
$$=ZERO_;
IS_RETURN=1;
}
| RETURN relop_expr MK_SEMICOLON{
if((func_return==ERROR_)||($2->type==ERROR_))
$$=ZERO_;
else if(func_return!=$2->type){
switch (func_return){
case INT_:
case FLOAT_:
if($2->type!=INT_&&$2->type!=FLOAT_){
printf("error %d: incompatible return type, expects to return %s, returning %s\n",linenumber,printtype(func_return),printtype($2->type));
$$=ERROR_;
}
break;
case VOID_:
printf("error %d: cannot return value from a void function\n",linenumber);
break;
}
}
else
{
gen_return($2);
$$=ZERO_;
}
IS_RETURN=1;
}
;
assign_expr_list : nonempty_assign_expr_list{$$=$1;}
|{$$=ZERO_;}
;
nonempty_assign_expr_list : nonempty_assign_expr_list MK_COMMA assign_expr{
if($3->type==ERROR_)
$$=$3->type;
else
$$=$1;
}
| assign_expr{$$=$1->type;}
;
test : {
gen_control_start(LABEL_NUM);
}
assign_expr
{
$$=$2;
//if ( $2->scope == 0 )
// $$->place = gen_relop_factor( $2, NULL, 0 );
gen_control_test( $2, LABEL_NUM );
$$->label_num = LABEL_NUM++;
}
;
assign_expr : ID OP_ASSIGN relop_expr
{
//printf("assign\n");
$$=assign_ex($1,$3);
}
| relop_expr{$$=$1;}
relop_expr : or_list
{
//printf("in b\n");
int label=stack_pop();
if (label)
{
int reg;
reg = get_result_reg();
$1->place=gen_or_tail(reg,label);
$1->name=NULL;
}
$$=$1;
}
;
relop_term : and_list
{
//printf("in d\n");
int label=stack_pop();
if (label)
{
int reg;
reg = get_result_reg();
$1->place=gen_and_tail(reg,label);
$1->name=NULL;
}
$$=$1;
}
;
or_list : relop_term {stack_push(0);$$=$1;}
| or_list OP_OR
{
//printf("in f\n");
if ($1->is_tail!=1)
if ($1->place!=0)
{
printf("\tbnez\t$%d, T%d\n", $1->place, ++BOOL_LABEL_NUM);
stack_top(BOOL_LABEL_NUM);
}
else
{
$1->place=gen_load_int(get_result_reg(),$1);
printf("\tbnez\t$%d, T%d\n", $1->place, ++BOOL_LABEL_NUM);
stack_top(BOOL_LABEL_NUM);
}
}
relop_term
{
//printf("in g\n");
if ($4->place!=0)
printf("\tbnez\t$%d, T%d\n", $4->place, stack_top(-1));
else
{
$4->place=gen_load_int(get_result_reg(),$4);
printf("\tbnez\t$%d, T%d\n", $4->place, stack_top(-1));
}
$$=$1;
$$->is_tail=1;
}
;
and_list: relop_factor {stack_push(0);$$=$1;}
| and_list OP_AND
{
//printf("in i\n");
if ($1->is_tail!=1)
if ($1->place!=0)
{
printf("\tbeqz\t$%d, F%d\n", $1->place, ++BOOL_LABEL_NUM);
stack_top(BOOL_LABEL_NUM);
}
else
{
$1->place=gen_load_int(get_result_reg(),$1);
printf("\tbeqz\t$%d, F%d\n", $1->place, ++BOOL_LABEL_NUM);
stack_top(BOOL_LABEL_NUM);
}
}
relop_factor
{
//printf("in j\n");
if ($4->place!=0)
printf("\tbeqz\t$%d, F%d\n", $4->place, stack_top(-1));
else
{
$4->place=gen_load_int(get_result_reg(),$4);
printf("\tbeqz\t$%d, F%d\n", $4->place, stack_top(-1));
}
$$=$1;
$$->is_tail=1;
}
;
relop_factor : expr{$$=$1;}
| expr rel_op expr{
if(($1->type==ERROR_)||($3->type==ERROR_))
$1->type=ERROR_;
else if((($1->type!=INT_)&&($1->type!=FLOAT_))||(($3->type!=INT_)&&($3->type!=FLOAT_))){
printf("error %d: relational operators applied to expression of non basic type\n",linenumber);
$1->type=ERROR_;
}
else
{
$$->place = gen_relop_factor($1, $3, $2);
$$->type=INT_;
$$->name=NULL;
}
}
;
rel_op : OP_EQ{$$=OP_EQ;}
| OP_GE{$$=OP_GE;}
| OP_LE{$$=OP_LE;}
| OP_NE{$$=OP_NE;}
| OP_GT{$$=OP_GT;}
| OP_LT{$$=OP_LT;}
;
relop_expr_list : nonempty_relop_expr_list {$$=$1;}
| {$$=NULL;}
;
nonempty_relop_expr_list : nonempty_relop_expr_list MK_COMMA relop_expr{
TypeList * TLP;
TLP=$1;
while(TLP->next!=NULL)
TLP=TLP->next;
TLP->next=Allocate(TYPELIST);
TLP->next->next=NULL;
TLP->next->P_var_r=$3;
$$=$1;
}
| relop_expr{
$$=Allocate(TYPELIST);
$$->P_var_r=$1;
$$->next=NULL;
}
;
expr : expr add_op term{
if($1->type==ERROR_||$3->type==ERROR_)
$1->type=ERROR_;
else if(($1->type!=INT_)&&($1->type!=FLOAT_)){//printf("expr %s\n",printtype($1->type));
printf("error %d: operator %s applied to non basic expr (%s)\n",linenumber,($2==OP_PLUS)?"+":"-",$1->name);
$1->type=ERROR_;
}
else if(($3->type!=INT_)&&($3->type!=FLOAT_)){
printf("error %d: operator %s applied to non basic factor (%s)\n",linenumber,($2==OP_TIMES)?"*":"/",$3->name);
$1->type=ERROR_;
}
else
{
$1->place = gen_expr($1,$3,$2);
$1->type=(($1->type==FLOAT_)||($3->type==FLOAT_))?FLOAT_:INT_;
}
$$=$1;
$$->name=NULL;
}
| term{$$=$1;}
;
add_op : OP_PLUS{$$=OP_PLUS;}
| OP_MINUS{$$=OP_MINUS;}
;
term : term mul_op factor{
if($1->type==ERROR_||$3->type==ERROR_)
$1->type=ERROR_;
else if(($1->type!=INT_)&&($1->type!=FLOAT_)){
printf("error %d: operator %s applied to non basic term (%s)\n",linenumber,($2==OP_TIMES)?"*":"/",$1->name);
$1->type=ERROR_;
}
else if(($3->type!=INT_)&&($3->type!=FLOAT_)){
printf("error %d: operator %s applied to non basic factor (%s)\n",linenumber,($2==OP_TIMES)?"*":"/",$3->name);
$1->type=ERROR_;
}
else
{
$1->place = gen_term($1, $3, $2);
$1->type=($1->type==FLOAT_||$3->type==FLOAT_)?FLOAT_:INT_;
}
$1->name=NULL;
$$=$1;
}
| factor {$$=$1;}
;
mul_op : OP_TIMES{$$=OP_TIMES;}
| OP_DIVIDE{$$=OP_DIVIDE;}
;
factor : MK_LPAREN relop_expr MK_RPAREN{$$=$2;}
| OP_MINUS MK_LPAREN relop_expr MK_RPAREN{
if($3->type!=INT_&&$3->type!=FLOAT_){
printf("error %d: operator Unary Minus applied to expression of non basic type\n",linenumber);
$3->type=ERROR_;
}
else if($3->type == INT_)
{
if($3->place==0)
$3->place=gen_load_int(get_reg($3),$3);
printf("\tneg $%d, $%d\n", $3->place, $3->place );
}
else if($3->type== FLOAT_)
{
if($3->place==0)
$3->place=gen_load_float(float_get_reg($3),$3);
printf("\tneg.s $f%d, $f%d\n", $3->place, $3->place );
}
$$=$3;
}
| OP_NOT MK_LPAREN relop_expr MK_RPAREN{
if($3->type!=INT_){
if($3->type!=FLOAT_){
printf("error %d: operator ! applied to non scalar expression\n",linenumber);
$3->type=ERROR_;
}
else{
//printf("warning %d: operator ! applied to a float expression\n",linenumber);
$3->type=INT_;
if($3->place==0)
$3->place=gen_load_int(get_reg($3),$3);
int reg = get_result_reg();
printf("\tli\t$%d, 0\n", reg );
printf("\tseq\t$%d, $%d, $%d\n", $3->place, reg, $3->place );
}
}
else
{
if($3->place==0)
$3->place=gen_load_int(get_reg($3),$3);
int reg = get_result_reg();
printf("\tli\t$%d, 0\n", reg );
printf("\tseq\t$%d, $%d, $%d\n", $3->place, reg, $3->place );
}
$$=$3;
}
| CONST{
$$=Allocate(VAR_REF);
$$->place=0;
if($1->const_type==INTEGERC)
{
$$->type=INT_;
$$->const_value.const_int=$1->const_u.intval;
}
else if($1->const_type==FLOATC)
{
$$->type=FLOAT_;
$$->const_value.const_float=$1->const_u.fval;
}
else if($1->const_type==STRINGC)
{
$$->type=STRING_;
$$->const_value.const_char=$1->const_u.sc;
}
else
$$->type=ERROR_;
$$->name=NULL;
}
| OP_MINUS CONST{
$$=Allocate(VAR_REF);
if($2->const_type!=INTEGERC && $2->const_type!=FLOATC){
printf("error %d: operator Unary Minus applied to non Basic constant\n",linenumber);
$$->type=ERROR_;
}
else
if($2->const_type==INTEGERC)
{
$$->type=INT_;
$$->const_value.const_int=-($2->const_u.intval);
}
else if($2->const_type==FLOATC)
{
$$->type=FLOAT_;
$$->const_value.const_float=-($2->const_u.fval);
}
$$->name=NULL;
}
| OP_NOT CONST{
$$=Allocate(VAR_REF);
if($2->const_type!=INTEGERC){
if($2->const_type!=FLOATC){
printf("error %d: operator ! applied to non scalar constant\n",linenumber);
$$->type=ERROR_;
}else{
//printf("warning %d: operator ! applied to a float constant\n",linenumber);
$$->type=ERROR_;
}
}