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parser.y
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%{
#include <string.h>
#include <stdio.h>
#include <stdlib.h>
#include <stdarg.h>
#include "./util/AST.h"
#include "./util/symbol.h"
#include "./util/token.h"
#include "./backend/backend.h"
char *currentFileName;
Type* currentFunctionType;
extern int level;
extern int lineno, col;
int templineno, tempcol;
int yyerror(char *s);
Symbol* getSymbol(char* name, SymbolTable* table, Coordinate src, char* format, ...);
void compileError(Coordinate pos, int lexemeLength, char *format, ...);
void errorMessage(Coordinate pos, int lexemeLength, char *format, ...);
int typeCheckAssign(TypeEnum t1, TypeEnum t2);
void typeCheckUnary(Node* t);
void typeCheckArrayInitialiser(Type* elementType, Node* expr);
Node* param_list_node, *funcBodyNode;
int yylex();
%}
%union {
int iValue;
float fValue;
char* sValue;
IdStruct id;
char cValue;
Node* node;
};
/* Keywords */
%token <iValue> K_INT K_FLOAT K_CHAR
%token FOR WHILE ELSE IF SWITCH CASE RETURN CONTINUE BREAK DEFAULT
/* Literals */
%token <iValue> INTEGER
%token <fValue> FLOAT
%token <cValue> CHARACTER
%token <sValue> STRING
/* Assignments */
%token PLUS_ASSIGN MINUS_ASSIGN STAR_ASSIGN SLASH_ASSIGN MOD_ASSIGN
/* Comparison */
/* %token EQ LE GE NE */
/* Logical */
/* %token AND OR */
/* Symbols */
/* %token */
/* Comments */
/* %token SINGLE_START MULTI_START MULTI_END */
/* Brackets */
/* %token LEFT_PAREN RIGHT_PAREN LEFT_BRACE RIGHT_BRACE LEFT_BRACKET RIGHT_BRACKET */
%token <id> IDENTIFIER
%token ERROR
%token EOF_TOKEN
%nonassoc IFX
%nonassoc ELSE
%left AND OR
%left GE LE EQ NE '>' '<'
%left '+' '-'
%left '*' '/' '%'
/* Math op */
%token INC DEC
%nonassoc UMINUS
%left '[' ']'
%nonassoc ARR
%type <node> expr arrayExpr callExpr arg_list continueStmt breakStmt returnStmt varInitialiser varNames arraySpecifier varDeclaration arrayInitialiser array_init_list param_list functionDecl declarations declaration funcBody stmtOrDecl stmt assignExpr switchStmt switchBody switchList caseLabel whileStmt blockStmt ifStmt forStmt forInit forCond forIter
%type <iValue> varType funcArraySpecifier
/* %t declarations declaration functionDecl param_list varInitialiser varDeclaration varType varNames arraySpecifier funcBody stmtOrDecl stmt assignExpr switchStmt switchBody switches cases caseLabel caseType whileStmt blockStmt ifStmt expr arrayExpr callExpr returnStmt continueStmt breakStmt arg_list */
%%
program: declarations EOF_TOKEN {
// printf("Program end\n");
backend($1, currentFileName);
return 0;
}
;
declarations: declarations declaration { $$ = oprNode(OPR_DECL_LIST, 2, $1, $2); }
| {$$ = NULL;}
;
declaration: functionDecl
| functionDecl ';'
/* | varDeclaration ';' */
;
functionDecl: varType IDENTIFIER {
Symbol* funcSymbol = install($2.name, &identifiers, level, $2.src);
if(funcSymbol->type){
errorMessage($2.src, strlen($2.name), ANSI_COLOR_BOLD ANSI_COLOR_CYAN "Note: " ANSI_COLOR_RESET "Function '%s' already declared", $2.name);
compileError(funcSymbol->src, strlen($2.name), "Declared here:");
}
beginScope();
}
'(' param_list ')'
{
Type* funcType = malloc(sizeof(Type));
funcType->sym = NULL;
funcType->op = T_FUNCTION;
funcType->type = malloc(sizeof(Type));
funcType->type->op = $1;
currentFunctionType = funcType;
}
funcBody
{
endScope();
Symbol* funcSymbol = install($2.name, &identifiers, level, $2.src);
// Type* funcType = malloc(sizeof(Type));
// funcType->sym = funcSymbol;
// funcType->op = T_FUNCTION;
// funcType->type = malloc(sizeof(Type));
// funcType->type->op = $1;
// currentFunctionType = funcType;
Type* funcType = currentFunctionType;
funcSymbol->type = currentFunctionType;
int numParams=0;
Node* temp = $5;
while(temp){
numParams++;
if(temp->as.opr.nops == 2)
temp = temp->as.opr.operands[0];
else temp = NULL;
}
funcType->size = numParams;
funcType->proto = malloc(sizeof(Type*) * numParams);
Node* param = $5;
int i=0;
// printf("donefg %d\n", numParams);
while(param){
if(param->as.opr.nops == 2){
//last param
// printf("Type of param is %d\n", param->as.opr.operands[0]->type);
funcType->proto[i] = param->as.opr.operands[1]->as.symbol->type;
} else {
funcType->proto[i] = param->as.opr.operands[0]->as.symbol->type;
}
i++;
if(param->as.opr.nops == 2)
param = param->as.opr.operands[0];
else param = NULL;
}
// if(funcType->proto)
// printf("func proto %d\n",1/* , funcType->proto[0]->op */);
// Symbol* funcSymbol = lookup($2.name, identifiers);
// printNode(param_list_node);
$<node>$ = oprNode(OPR_FUNC, 3, identifierNode(funcSymbol), param_list_node, funcBodyNode);
currentFunctionType = NULL;
}
;
funcArraySpecifier: '['']' {$$=1;} | {$$=0;} ;
param_list: varType IDENTIFIER funcArraySpecifier {
Symbol* psym = install($2.name, &identifiers, level, $2.src);
$$ = oprNode(OPR_LIST, 1, identifierNode(psym));
Type* paramType = malloc(sizeof(Type));
paramType->op = $1;
paramType->type=NULL;
paramType->sym = psym;
psym->type = paramType;
if($3){
psym->type = newType(T_ARRAY);
psym->type->type = paramType;
psym->type->sym = psym;
}
param_list_node = $$;
}
| param_list ',' varType IDENTIFIER funcArraySpecifier {
Symbol* psym = install($4.name, &identifiers, level, $4.src);
if(psym->type){
compileError($4.src, strlen($4.name), "Parameter %s already declared", $4.name);
}
Type* paramType = malloc(sizeof(Type));
paramType->op = $3;
paramType->type=NULL;
paramType->sym = psym;
psym->type = paramType;
if($5){
psym->type = newType(T_ARRAY);
psym->type->type = paramType;
psym->type->sym = psym;
}
$$ = oprNode(OPR_LIST, 2, $1, identifierNode(psym));
param_list_node = $$;
}
| {$$=NULL; param_list_node = NULL;}
;
//int arr[10][20] = {1,2,3,4};
varInitialiser: IDENTIFIER arraySpecifier {
$$ = oprNode('=', 2, identifierNode(install($1.name, &identifiers, level, $1.src)), $2);
$$->src = $1.src;
}
| IDENTIFIER arraySpecifier '=' expr {
$$ = oprNode('=', 3, identifierNode(install($1.name, &identifiers, level, $1.src)), $2, $4);
$$->src = $1.src;
}
| IDENTIFIER arraySpecifier '=' arrayInitialiser {$$ = oprNode('=', 3, identifierNode(install($1.name, &identifiers, level, $1.src)), $2, $4); $$->src = $1.src;}
arrayInitialiser: '{' array_init_list '}' { $$ = $2; $$->exprType.op = T_ARRAY;}
array_init_list: expr { /* $$ = oprNode(OPR_LIST, 1, $1); */}
| array_init_list ',' expr { $$ = oprNode(OPR_LIST, 3, $1, $3, NULL); }
| arrayInitialiser { /* $$ = oprNode(OPR_LIST, 1, $1); */$$ = $1; $$->exprType.op = T_ARRAY;}
| array_init_list ',' arrayInitialiser { $$ = oprNode(OPR_LIST, 3, $1, $3, NULL); $$->exprType.op = T_ARRAY;}
;
/* expr_list: expr
| expr_list ',' expr
|
; */
varDeclaration: varType varNames {
$$ = oprNode(OPR_VAR_DECL, 1, $2);
// printf("Found var decl %d, \n", $2->as.opr.type);
//iterate through the list of variables and add them to the symbol table
Node* varName = $2;
while(varName != NULL) {
Node* varInitialiser;
if(varName->as.opr.type == OPR_LIST) {
varInitialiser = varName->as.opr.operands[1];
// printf("Found list %d\n", varInitialiser->as.opr.type);
} else {
varInitialiser = varName;
}
// printf("Found var decl for '%s', \n", varInitialiser->as.opr.operands[0]->as.symbol->name);
Symbol* varSymbol = varInitialiser->as.opr.operands[0]->as.symbol;
Symbol* installed = install(varSymbol->name, &identifiers, level, varSymbol->src);
Coordinate src = varSymbol->src;
if(installed->type){
errorMessage(varInitialiser->src, strlen(varSymbol->name), ANSI_COLOR_BOLD ANSI_COLOR_CYAN "Note: " ANSI_COLOR_RESET "Variable '%s' already declared", varSymbol->name);
compileError(varSymbol->src, strlen(varSymbol->name), "Declared here");
}
Type* type = malloc(sizeof(Type));
type->sym = installed;
installed->type = type;
type->op = $1;
int arrLastSize = -1;
//check if this is an array
if(varInitialiser->as.opr.operands[1] != NULL){
Node* arraySpecifier = varInitialiser->as.opr.operands[1];
Type* outerType = type;
do {
arrLastSize = arraySpecifier->as.opr.operands[1]->as.value->as.integer;
//check if size is declared for dimensions other than first
if(arrLastSize <= 0 && arraySpecifier->as.opr.operands[0] != NULL){
compileError(src, strlen(varSymbol->name), "Array dimensions except the first cannot be empty %d", arrLastSize);
}
Type* innerType = malloc(sizeof(Type));
outerType->sym = installed;
outerType->op = T_ARRAY;
outerType->size = arrLastSize;
outerType->type = innerType;
outerType = innerType;
} while((arraySpecifier = arraySpecifier->as.opr.operands[0]));
outerType->sym = installed;
outerType->op = $1;
outerType->size = arrLastSize;
// installed->type=outerType;
// printf("Innermost type is %d\n", outerType->op);
}
// printf("\nType op of this var is %d\n", installed->type->op);
//Check if there is an initialiser expression assignment
if(varInitialiser->as.opr.nops == 3){
Node* expr = varInitialiser->as.opr.operands[2];
// printf("Found initialiser %d\n", expr->exprType);
if(!typeCheckAssign(installed->type->op, expr->exprType.op)){
compileError(src, strlen(varSymbol->name), "Type mismatch in variable initialisation of '%s'", varSymbol->name);
}
//Check if string initialiser
if(expr->type == NODE_LITERAL && expr->as.value->type == T_ARRAY){
if(installed->type->op != T_ARRAY || installed->type->type->op != T_CHAR){
compileError(src, strlen(varSymbol->name), "Type mismatch (string must be char[]) in variable initialisation %s", varSymbol->name);
}
}
//Check if the initialiser is an array
if(expr->as.opr.type == OPR_LIST){
//check every element type
typeCheckArrayInitialiser(installed->type, expr);
}
}
//Move forward to the next variable
if(varName->as.opr.type == OPR_LIST){
varName = varName->as.opr.operands[0];
} else {
varName = NULL;
}
}
}
;
varType: K_INT {$$ = T_INT;} | K_CHAR {$$ = T_CHAR;}| K_FLOAT {$$ = T_FLOAT;};
varNames: varInitialiser
| varNames ',' varInitialiser {$$ = oprNode(OPR_LIST, 2, $1, $3); }
arraySpecifier: arraySpecifier '[' INTEGER ']' {
$$ = oprNode(OPR_LIST, 2, $1, intNode($3));
}
| arraySpecifier '[' ']' {
$$ = oprNode(OPR_LIST, 2, $1, intNode(0));
}
| { $$ = NULL; }
;
funcBody: '{' {$<node>$ = NULL;}
stmtOrDecl
'}' { $$ = $3;}
;
stmtOrDecl: stmtOrDecl stmt {$$ = oprNode(OPR_LIST, 2, $1, $2); funcBodyNode = $$;}
| stmtOrDecl varDeclaration ';' {$$ = oprNode(OPR_LIST, 2, $1, $2); funcBodyNode = $$;}
| {$$ = NULL; funcBodyNode = $$;}
;
/* stmtList: stmtList stmt */
/* |
; */
stmt: ';' {$$ = NULL;}
| blockStmt
/* | varDeclaration ';' */
| assignExpr ';'
/* | expr ';' */
| callExpr ';'
| ifStmt
| whileStmt
| forStmt
| switchStmt
| returnStmt ';'
| breakStmt ';'
| continueStmt ';'
;
forStmt: FOR '(' {beginScope();} forInit ';' forCond ';' forIter ')' stmt {
endScope();
$$ = oprNode(OPR_FOR, 4, $4, $6, $8, $10);
}
forInit: assignExpr
| varDeclaration
| {$$ = NULL;}
;
forCond: expr
| {$$ = NULL;}
;
forIter: assignExpr
| {$$=NULL;}
;
assignExpr: IDENTIFIER '=' expr {
// printf("Found assign target\n");
Symbol* sym = getSymbol($1.name, identifiers, $1.src, "Variable '%s' not declared", $1.name);
if(!typeCheckAssign(sym->type->op, $3->exprType.op)){
compileError($1.src, strlen($1.name), "Type mismatch in assignment %s", $1.name);
}
$$ = oprNode(OPR_ASSIGN, 2, identifierNode(sym), $3);
}
| IDENTIFIER INC {
Symbol* sym = getSymbol($1.name, identifiers, $1.src, "Variable '%s' not declared", $1.name);
compileError((Coordinate){lineno, col-2}, 2, "Increment operator not allowed");
if(sym->type->op != T_INT && sym->type->op != T_FLOAT){
compileError($1.src, strlen($1.name), "Only int and float can be incremented %s", $1.name);
}
$$ = oprNode(OPR_INC, 1, identifierNode(sym));
}
| IDENTIFIER DEC {
Symbol* sym = getSymbol($1.name, identifiers, $1.src, "Variable '%s' not declared", $1.name);
compileError((Coordinate){lineno, col-2}, 2, "Decrement operator not allowed");
if(sym->type->op != T_INT && sym->type->op != T_FLOAT){
compileError($1.src, strlen($1.name), "Only int and float can be decremented %s", $1.name);
}
$$ = oprNode(OPR_DEC, 1, identifierNode(sym));
}
| arrayExpr '=' expr {
// printf("Got array type as %d = %d\n", $1->exprType.op, $3->exprType.op);
if(!typeCheckAssign($1->exprType.op, $3->exprType.op)){
compileError($1->src, $3->src.length + $1->src.length, "Type mismatch in assignment to array");
}
$$ = oprNode(OPR_ASSIGN, 2, $1, $3);
}
| arrayExpr INC {
if($1->exprType.op != T_INT && $1->exprType.op != T_FLOAT){
compileError($1->src, $1->src.length + 2, "Only int and float can be incremented");
}
$$ = oprNode(OPR_INC, 1, $1);
}
| arrayExpr DEC {
if($1->exprType.op != T_INT || $1->exprType.op != T_FLOAT){
compileError($1->src, $1->src.length+2, "Only int and float can be decremented");
}
$$ = oprNode(OPR_DEC, 1, $1);
}
;
switchStmt:
SWITCH { errorMessage((Coordinate){lineno, col-6, 0}, 6,
ANSI_COLOR_BOLD ANSI_COLOR_BLUE
"Warning: " ANSI_COLOR_RESET "Switch statement is not implemented");
}
'(' expr ')' {beginScope();} '{' switchBody '}' { $$ = NULL; endScope();}
switchBody: switchList | {$$ = NULL;};
switchList: stmt
| varDeclaration
| caseLabel
| switchList caseLabel
| switchList stmt
| switchList varDeclaration
;
/* switches: cases
|
; */
/* cases: caseLabel stmtList
| cases caseLabel stmtList
; */
caseLabel: CASE {templineno = lineno; tempcol = col- 4;} expr ':' {
if($3->type!= NODE_LITERAL){
compileError((Coordinate){templineno, tempcol, 0}, $3->src.length + 5, "Case label must be a constant");
}
if($3->exprType.op != T_INT){
compileError((Coordinate){templineno, tempcol, 0}, $3->src.length+5, "Case label must be an integer");
}
}
| DEFAULT ':' {$$ = NULL;}
;
whileStmt: WHILE '(' expr ')' stmt {$$ = oprNode(OPR_WHILE, 2, $3, $5);}
blockStmt: '{' {beginScope();}
stmtOrDecl
'}'
{endScope(); $$ = $3;}
;
ifStmt: IF '(' expr ')' stmt %prec IFX { $$ = oprNode(OPR_IF, 2, $3, $5);}
| IF '(' expr ')' stmt ELSE stmt { $$ = oprNode(OPR_IF, 3, $3, $5, $7);}
expr: INTEGER {$$ = intNode($1);}
| CHARACTER {$$ = charNode($1); }
| IDENTIFIER {
Symbol* foundId = getSymbol($1.name, identifiers, $1.src, "Identifier '%s' not declared in this scope", $1.name);
$$ = identifierNode(foundId);
}
| FLOAT {$$ = floatNode($1);}
| STRING {$$ = strNode($1, strlen($1));}
| callExpr {$$ = $1;}
| '-' expr %prec UMINUS { $$ = oprNode('-', 1, $2); typeCheckUnary($2); $$->exprType.op = $2->exprType.op;}
| '!' expr %prec UMINUS { $$ = oprNode('!', 1, $2); typeCheckUnary($2); $$->exprType.op = $2->exprType.op;}
| expr '+' expr { $$ = oprNode('+', 2, $1, $3); $$->exprType.op = typeWiden($1->exprType.op, $3->exprType.op);}
| expr '-' expr { $$ = oprNode('-', 2, $1, $3); $$->exprType.op = typeWiden($1->exprType.op, $3->exprType.op);}
| expr '*' expr { $$ = oprNode('*', 2, $1, $3); $$->exprType.op = typeWiden($1->exprType.op, $3->exprType.op);}
| expr '/' expr { $$ = oprNode('/', 2, $1, $3); $$->exprType.op = typeWiden($1->exprType.op, $3->exprType.op);}
| expr '<' expr { $$ = oprNode('<', 2, $1, $3); $$->exprType.op = typeWiden($1->exprType.op, $3->exprType.op);}
| expr '>' expr { $$ = oprNode('>', 2, $1, $3); $$->exprType.op = typeWiden($1->exprType.op, $3->exprType.op);}
| expr '%' expr { $$ = oprNode('%', 2, $1, $3); $$->exprType.op = T_INT; if($1->exprType.op != T_INT || $3->exprType.op != T_INT){compileError($1->src, $1->src.length + $3->src.length, "Modulo operator only works on integers");}}
| expr GE expr { $$ = oprNode(OPR_GE, 2, $1, $3); $$->exprType.op = typeWiden($1->exprType.op, $3->exprType.op);}
| expr LE expr { $$ = oprNode(OPR_LE, 2, $1, $3); $$->exprType.op = typeWiden($1->exprType.op, $3->exprType.op);}
| expr EQ expr { $$ = oprNode(OPR_EQ, 2, $1, $3); $$->exprType.op = typeWiden($1->exprType.op, $3->exprType.op);}
| expr NE expr { $$ = oprNode(OPR_NE, 2, $1, $3); $$->exprType.op = typeWiden($1->exprType.op, $3->exprType.op);}
| expr AND expr { $$ = oprNode(OPR_AND, 2, $1, $3); $$->exprType.op = T_INT;if($1->exprType.op != T_INT || $3->exprType.op != T_INT){compileError($1->src, $1->src.length + $3->src.length, "Boolean operators only work on integers");}}
| expr OR expr { $$ = oprNode(OPR_OR, 2, $1, $3); $$->exprType.op = T_INT;if($1->exprType.op != T_INT || $3->exprType.op != T_INT){compileError($1->src, $1->src.length + $3->src.length, "Boolean operators only work on integers");}}
| '(' expr ')' { $$ = $2; $$->exprType.op = $2->exprType.op;}
| arrayExpr {$$ = $1; $$->exprType.op = $1->exprType.op;}
/* | expr '[' expr ']' %prec ARR{printf("Found array expression\n");} */
/* | expr INC */
;
arrayExpr: expr '[' expr ']' %prec ARR {
// printf("Found array expression type %d\n", $1->exprType.ndim);
if($1->exprType.op != T_ARRAY){
compileError($1->src, $1->src.length + $3->src.length + 2, "Invalid indexing target. Only array types can be indexed.");
}
if($3->exprType.op != T_INT){
compileError($3->src, $3->src.length, "Only int types can be used as indices.");
}
$$ = oprNode('[', 2, $1, $3);
$$->exprType.base = $1->exprType.base;
$$->exprType.op = $1->exprType.ndim == 1 ? $1->exprType.base : T_ARRAY;
$$->exprType.ndim = $1->exprType.ndim - 1;
$$->src.length = $1->src.length + $3->src.length + 2;
}
callExpr: IDENTIFIER '(' arg_list ')' {
Symbol* callee = lookup($1.name, identifiers);
if(!callee){
// compileError("Error: Function '%s' not defined", $1);
compileError($1.src, strlen($1.name), "Function '%s' not defined", $1.name);
}
if(callee->type->op != T_FUNCTION){
compileError($1.src, strlen($1.name), "Identifier '%s' is not a function", $1.name);
}
//Type check all parameters
Node *param = $3;
int i=callee->type->size-1;
// printf("Starting with %d params\n", i);
//ignore type checking for variadic functions
if(!callee->type->variadicFunc){
// printf("here\n");
if(param){
while(param->as.opr.type==OPR_LIST && i >= 0){
// printf("Comparing with original type= %d\n", callee->type->proto[i]->op);
if(!typeCheckAssign(callee->type->proto[i]->op, param->as.opr.operands[1]->exprType.op)){
compileError(param->as.opr.operands[1]->src, param->as.opr.operands[1]->src.length, "Type mismatch in function call to '%s'", $1.name);
}
param = param->as.opr.operands[0];
i--;
}
if(i>=0){
// printf("Comparing with original type %d \n", /* param->exprType.op, */ callee->type->proto[i]->op);
// printf("inside %d\n", callee->type->proto[i] == NULL);
}
if(i<0 && !callee->type->variadicFunc) {
compileError($1.src, strlen($1.name), "Too many parameters in function call to '%s'", $1.name);
}
if(!callee->type->variadicFunc && !typeCheckAssign(callee->type->proto[i]->op, param->exprType.op)){
compileError($1.src, strlen($1.name), "Type mismatch in function call to '%s'", $1.name);
}
i--;
}
if(i >= 0){
compileError($1.src, strlen($1.name), "Too few parameters in function call to '%s'; expected %d", $1.name, callee->type->size);
}
}
$$ = oprNode(OPR_CALL, 2, identifierNode(callee), $3);
$$->exprType.op = callee->type->type->op;
// printNode($$);
}
arg_list: expr {$$ = $1;/* oprNode(OPR_LIST, 1,$1); */}
| arg_list ',' expr {$$ = oprNode(OPR_LIST, 2, $1, $3);}
| {$$ = NULL;}
;
returnStmt: RETURN {
Coordinate src;
src.line = lineno;
src.col = 0;
compileError(src, 0, "Expected an expression to return");
$$ = oprNode(OPR_RETURN, 0);
}
| RETURN expr {
if(!typeCheckAssign(currentFunctionType->type->op, $2->exprType.op)){
compileError($2->src, $2->src.length, "Type mismatch in return statement");
}
$$ = oprNode(OPR_RETURN, 1, $2);
}
;
continueStmt: CONTINUE {$$ = oprNode(OPR_CONTINUE, 0);}
;
breakStmt: BREAK {$$ = oprNode(OPR_BREAK, 0);}
;
%%
void typeCheckArrayInitialiser(Type* elementType, Node* expr){
/* printf("here\n"); */
Node* exprList = expr;
TypeEnum baseType = getArrayBaseType(elementType);
/* printf("Starting array %d\n", elementType->type->op, exprList); */
/* printNode(exprList);
printf("\n\n======\n"); */
if(exprList == NULL) return;
if(elementType == NULL){
compileError(exprList->src, exprList->src.length, "Invalid array element type");
}
//if it is not a list, this is the last element
if(exprList->type != NODE_OPR && exprList->as.opr.type != OPR_LIST){
Node* insideElement = exprList;//->as.opr.operands[0];
if(elementType->type == NULL){
compileError( insideElement->src, insideElement->src.length, "Invalid array element type");
}
/* printf("Checking 1) %d %d\n", elementType->type->op, insideElement->exprType.op); */
if(!typeCheckAssign(elementType->type->op, insideElement->exprType.op) && !typeCheckAssign(baseType, insideElement->exprType.op)){
compileError( insideElement->src, insideElement->src.length, "Invalid array element type %d %d", elementType->type->op, insideElement->exprType.op);
}
if(insideElement->as.opr.type == OPR_LIST){
typeCheckArrayInitialiser(elementType->type, insideElement);
}
} else {
//this is a list, so check the second operand
//if it is a list, it will be checked recursively
/* printf("Checking %d %d\n", elementType->type->op, exprList->as.opr.operands[1]->exprType.op); */
Node* localElement = exprList->as.opr.operands[1];
if(localElement->as.opr.type == OPR_LIST){
typeCheckArrayInitialiser(elementType->type, exprList->as.opr.operands[1]);
}
TypeEnum baseType = getArrayBaseType(elementType);
/* printf("Checking 2) %d %d\n", baseType, localElement->exprType.op); */
if(!typeCheckAssign(baseType, localElement->exprType.op) && !typeCheckAssign(elementType->type->op, localElement->exprType.op)){
compileError(localElement->src, localElement->src.length, "Invalid array element type 2");
}
//advance to next element in list
typeCheckArrayInitialiser(elementType, exprList->as.opr.operands[0]);
}
}
void typeCheckUnary(Node* node){
int invalid = 0;
switch(node->type){
case NODE_LITERAL:
//cannot operate on strings
invalid = (node->as.value->type == T_ARRAY);
break;
case NODE_SYMBOL:
//cannot operate on arrays
invalid = (node->as.symbol->type->op == T_ARRAY);
break;
case NODE_OPR:
//cannot operate on arrays
invalid = (node->exprType.op == T_ARRAY);
break;
default:
invalid = 1;
break;
}
if(invalid){
Coordinate src;
src.line=lineno;
src.col = col;
compileError(src, 1, "Invalid operand type");
}
}
/* Type check two types
Tries to widen a type to match the other,
otherwise raises compileError.
*/
int typeCheckAssign(TypeEnum varType, TypeEnum exprType){
//exprType cannot larger than varType
if(varType != T_ARRAY && exprType == T_ARRAY){
return 0;
}
if(varType == T_ARRAY && exprType != T_ARRAY){
return 0;
}
if(varType == T_FUNCTION && exprType != T_FUNCTION){
return 0;
}
if(varType == T_FLOAT){
if(exprType == T_FUNCTION || exprType == T_ARRAY){
return 0;
}
return 1;
}
return varType == exprType;
}
void point_at_in_line(int lineno, int from, int to);
Symbol* getSymbol(char* name, SymbolTable* table, Coordinate src, char* format, ...){
Symbol* foundIdentifier = lookup(name, table);
if(!foundIdentifier){
va_list args;
va_start(args, format);
fprintf(stderr, ANSI_COLOR_BOLD "%s[%d:%d] ", currentFileName, src.line, src.col);
fprintf(stderr, "Error: " ANSI_COLOR_RESET);
vfprintf(stderr, format, args);
fprintf(stderr, "\n");
point_at_in_line(src.line-1, src.col -1 , src.col + strlen(name) -1 );
va_end(args);
exit(1);
}
return foundIdentifier;
}
/**
* Prints a message to stderr and exits the program
* @param format The format string
* @param ... The arguments to the format string
*/
void compileError(Coordinate src, int lexemeLength, char* format, ...){
va_list args;
va_start(args, format);
fprintf(stderr, ANSI_COLOR_BOLD "%s[%d:%d] ", currentFileName, src.line, src.col);
fprintf(stderr, ANSI_COLOR_RED "Error: " ANSI_COLOR_RESET);
vfprintf(stderr, format, args);
fprintf(stderr, "\n");
point_at_in_line(src.line-1, src.col -1 , src.col + lexemeLength -1 );
va_end(args);
exit(1);
}
// Prints the error but does not exit.
void errorMessage(Coordinate src, int lexemeLength, char* format, ...){
va_list args;
va_start(args, format);
fprintf(stderr, ANSI_COLOR_BOLD "%s[%d:%d] " ANSI_COLOR_RESET, currentFileName, src.line, src.col);
vfprintf(stderr, format, args);
fprintf(stderr, "\n");
point_at_in_line(src.line-1, src.col -1 , src.col + lexemeLength -1 );
va_end(args);
}
/* int main(int argc, char* argv[]){
return 0;
} */
/* int yyerror(char *s){
exit(1);
return 1;
} */