int semantic_check(node *ast) {
if(!ast)
return 0;
int btype;
switch((int)ast->kind) {
case UNKNOWN:
break;
case NSCOPE:
lhs = semantic_check(ast->scope.declarations);
if(lhs == -1)
return -1;
rhs = semantic_check(ast->scope.statements);
if(rhs == -1)
return -1;
if(lhs > rhs)
return lhs;
else
return rhs;
break;
case NDECLARATIONS:
lhs = semantic_check(ast->declarations.declarations);
if(lhs == -1)
return -1;
rhs = semantic_check(ast->declarations.declaration);
if(rhs == -1)
return -1;
else
return rhs;
break;
case NSTATEMENTS:
lhs = semantic_check(ast->statements.statements);
if(lhs == -1)
return -1;
rhs = semantic_check(ast->statements.statement);
if(rhs == -1)
return -1;
else
return rhs;
break;
case NTYPE_DECLARATION:
if(isVarDeclared(sym_table, ast->type_declaration.id, scopeNum)) {
fprintf(errorFile, "Error: Variable cannot be re-declared within the same scope\n");
errorOccurred = 1;
return -1;
}
else
return semantic_check(ast->type_declaration.type);
break;
case NASSIGN_DECLARATION:
lhs = semantic_check(ast->assign_declaration.type);
if(lhs == -1)
return -1;
rhs = semantic_check(ast->assign_declaration.expression);
if(rhs == -1)
return -1;
if(isVarDeclared(sym_table, ast->assign_declaration.id, scopeNum)) {
fprintf(errorFile, "Error: Variable cannot be re-declared within the same scope\n");
errorOccurred = 1;
return -1;
}
if(lhs == rhs)
return lhs;
else if((lhs == IVEC2 || lhs == IVEC3 || lhs == IVEC4) && (rhs == INT))
return INT;
else if((lhs == BVEC2 || lhs == BVEC3 || lhs == BVEC4) && (rhs == BOOL))
return BOOL;
else if((lhs == VEC2 || lhs == VEC3 || lhs == VEC4) && (rhs == FLOAT))
return FLOAT;
else {
fprintf(errorFile, "Error: Declaration failed, type mismatch in assignment\n");
errorOccurred = 1;
return -1;
}
break;
case NCONST_DECLARATION:
lhs = semantic_check(ast->const_declaration.type);
if(lhs == -1)
return -1;
rhs = semantic_check(ast->const_declaration.expression);
if(rhs == -1)
return -1;
type_class = get_tClass(sym_table, ast->const_declaration.type->id_variable.id);
if(ast->const_declaration.type->kind != NINT_EXPR && ast->const_declaration.type->kind != NFLOAT_EXPR && ast->const_declaration.type->kind != NBOOL_EXPR && ast->const_declaration.type->kind != NTYPE_EXPR && ast->const_declaration.type->kind != NARRAY_VARIABLE && type_class != _CONST && type_class != UNIFORM) {
fprintf(errorFile, "Error: 'const' qualified variables must be initialized with a literal value or with a uniform variable\n");
errorOccurred = 1;
return -1;
}
if(lhs == rhs)
return lhs;
else if((lhs == IVEC2 || lhs == IVEC3 || lhs == IVEC4) && (rhs == INT))
return INT;
else if((lhs == VEC2 || lhs == VEC3 || lhs == VEC4) && (rhs == FLOAT))
return FLOAT;
else if((lhs == BVEC2 || lhs == BVEC3 || lhs == BVEC4) && (rhs == BOOL))
return BOOL;
else {
fprintf(errorFile, "Error: Type mismatch in assignment\n");
errorOccurred = 1;
return -1;
}
break;
case NASSIGN_STATEMENT:
lhs = semantic_check(ast->assign_statement.variable);
if(lhs == -1)
return -1;
rhs = semantic_check(ast->assign_statement.expression);
if(rhs == -1)
return -1;
else
return CheckTypes(rhs, lhs);
break;
case NIF_STATEMENT:
lhs = semantic_check(ast->if_statement.condition);
if(lhs == -1)
return -1;
if(lhs == BOOL)
semantic_check(ast->if_statement.statement);
else {
fprintf(errorFile, "Error: Condition must be of type 'bool'\n");
errorOccurred = 1;
return -1;
}
break;
case NIF_ELSE_STATEMENT:
lhs = semantic_check(ast->if_else_statement.condition);
if(lhs == -1)
return -1;
if(lhs == BOOL) {
semantic_check(ast->if_else_statement.statement);
semantic_check(ast->if_else_statement.else_statement);
}
else {
fprintf(errorFile, "Error: Condition must be of type 'bool'\n");
errorOccurred = 1;
return -1;
}
break;
case NSCOPE_STATEMENT:
scopeNum++;
check_prog_scope = semantic_check(ast->prog_scope.scope);
scopeNum--;
return check_prog_scope;
break;
//unary expression
case NUNARY_EXPR:
rhs = semantic_check(ast->unary_expr.right);
if(rhs == -1)
return -1;
if(ast->unary_expr.op == MINUS_OPS) {
if(rhs == BOOL || rhs == BVEC2|| rhs == BVEC3|| rhs == BVEC4){
fprintf(errorFile, "Error: All operands to arithmetic operators must have arithmetic types\n");
errorOccurred = 1;
return -1;
}
else
return rhs;
}
if(ast->unary_expr.op == NOT_OPS) {
if(rhs != BOOL || rhs != BVEC2 || rhs != BVEC3 || rhs != BVEC4) {
fprintf(errorFile, "Error: All operands to logical operators must have boolean types\n");
errorOccurred = 1;
return -1;
}
else
return rhs;
}
break;
case NBINARY_EXPR:
rhs = semantic_check(ast->binary_expr.right);
if(rhs == -1)
return -1;
lhs = semantic_check(ast->binary_expr.left);
btype = CheckTypes(rhs, lhs);
if(lhs == -1){
return -1;
}else if(btype == -1){
fprintf(errorFile, "Error: The operands to binary operators must have same base types\n");
errorOccurred = 1;
return -1;
}else if(vectorChecking(rhs) == 1 && vectorChecking(lhs) == 1){
if(vectorCompare(rhs, lhs) == 0){
fprintf(errorFile, "Error: The vector operands to binary operators must have same order\n");
errorOccurred = 1;
return -1;
}else{
btype = BOOL;
ast->binary_expr.type = btype;
return btype;
}
}else if(ast->binary_expr.op == AND_OPS || ast->binary_expr.op == OR_OPS ||ast->binary_expr.op == EQ_OPS || ast->binary_expr.op == NEQ_OPS){
if(rhs != BOOL || rhs != BVEC2 || rhs != BVEC3 || rhs != BVEC4 || lhs != BOOL || lhs != BVEC2 || lhs != BVEC3 || lhs != BVEC4){
fprintf(errorFile, "Error: All operands to logical operators must have boolean types\n");
errorOccurred = 1;
return -1;
}else if((vectorChecking(rhs) && !vectorChecking(lhs)) || (!vectorChecking(rhs) && vectorChecking(lhs))){
fprintf(errorFile, "Error: The operands to logical operators must be both vectors or both scalars\n");
errorOccurred = 1;
return -1;
}else{
btype = BOOL;
ast->binary_expr.type = btype;
return btype;
}
}else if(ast->binary_expr.op == LESS_OPS || ast->binary_expr.op == LEQ_OPS ||ast->binary_expr.op == GTR_OPS || ast->binary_expr.op == GEQ_OPS || ast->binary_expr.op == PLUS_OPS || ast->binary_expr.op == MINUS_OPS || ast->binary_expr.op == DIVIDE_OPS || ast->binary_expr.op == POW_OPS || ast->binary_expr.op == TIMES_OPS){
if(rhs == BOOL || rhs == BVEC2|| rhs == BVEC3|| rhs == BVEC4 || lhs == BOOL || lhs == BVEC2|| lhs == BVEC3|| lhs == BVEC4){
fprintf(errorFile, "Error: All operands to arithmetic operators must have arithmetic types.\n");
errorOccurred = 1;
return -1;
}else if( ast->binary_expr.op != TIMES_OPS && (vectorChecking(rhs) == 1 || vectorChecking(lhs) == 1)){
fprintf(errorFile, "Error: The operands to arithmetic operators (except for times) must be both vectors or both scalars\n");
errorOccurred = 1;
return -1;
}else{
btype = BOOL;
ast->binary_expr.type = btype;
return btype;
}
}
else
return -1;
break;
case NBRACKETS_EXPR:
return semantic_check(ast->brackets_expr.expression);
break;
case NFUNC_EXPR:
rhs = semantic_check(ast->func_expr.arguments_opt);
if(rhs == -1)
return -1;
switch(ast->func_expr.func) {
case 0:
if(rhs == IVEC3 || rhs == IVEC4)
return INT;
else if(rhs == VEC3 || rhs == VEC4)
return FLOAT;
else {
fprintf(errorFile, "Error: Function argument doesn't match as expected ('db3' supports arguments of type 'vec3', 'vec4', 'ivec3' & 'ivec4')\n");
errorOccurred = 1;
return -1;
}
break;
case 1:
if(rhs == VEC4)
return VEC4;
else {
fprintf(errorFile, "Error: Function argument doesn't match as expected ('lit' only supports argument of type 'vec4')\n");
errorOccurred = 1;
return -1;
}
break;
case 2:
if(rhs == FLOAT || rhs == INT)
return FLOAT;
else {
fprintf(errorFile, "Error: Function argument doesn't match as expected ('rsq' supports arguments of type 'int' & 'float')\n");
errorOccurred = 1;
return -1;
}
break;
default:
fprintf(errorFile, "Error: Function name doesn't match as expected (supported function names - 'db3', 'lit' & 'rsq')\n");
errorOccurred = 1;
return -1;
break;
}
break;
case NTYPE_EXPR:
lhs = semantic_check(ast->type_expr.type);
if(lhs == -1)
return -1;
rhs = semantic_check(ast->type_expr.arguments_opt);
if(rhs == -1)
return -1;
numArgs = countArg(ast->type_expr.arguments_opt);
if((lhs == IVEC2 && numArgs == 2) || (lhs == IVEC3 && numArgs == 3) || (lhs == IVEC4 && numArgs == 4) || (lhs == BVEC2 && numArgs == 2) || (lhs == BVEC3 && numArgs == 3) || (lhs == BVEC4 && numArgs == 4) || (lhs == VEC2 && numArgs == 2) || (lhs == VEC3 && numArgs == 3) || (lhs == VEC4 && numArgs == 4) || (lhs == BOOL && numArgs == 1) || (lhs == INT && numArgs == 1) || (lhs == FLOAT && numArgs == 1))
;
else {
fprintf(errorFile, "Error: Costructors for basic types (bool, int, float) must have one argument and vector types must have as many arguments as there are elements in the vector\n");
errorOccurred = 1;
return -1;
}
if(lhs == rhs)
return lhs;
else if((lhs == IVEC2 || lhs == IVEC3 || lhs == IVEC4) && (rhs == INT))
return INT;
else if((lhs == VEC2 || lhs == VEC3 || lhs == VEC4) && (rhs == FLOAT))
return FLOAT;
else if((lhs == BVEC2 || lhs == BVEC3 || lhs == BVEC4) && (rhs == BOOL))
return BOOL;
else {
fprintf(errorFile, "Error: Type mismatch found\n");
errorOccurred = 1;
return -1;
}
break;
case NVAR_EXPR:
return semantic_check(ast->var_expr.variable);
break;
case NINT_EXPR:
return INT;
break;
case NFLOAT_EXPR:
return FLOAT;
break;
case NBOOL_EXPR:
return BOOL;
break;
case NID_VARIABLE:
id = ast->id_variable.id;
if(!isVarDeclaredInScope(sym_table, id, scopeNum)) {
fprintf(errorFile, "Error: Variable cannot be used before it is declared\n");
errorOccurred = 1;
return -1;
}
else if(strcmp(id, "TEMP") == 0 || strcmp(id, "ADDRESS") == 0) {
fprintf(errorFile, "Error: Reserved words can not be used as variable\n");
errorOccurred = 1;
return -1;
}
else {
type_class = get_tClass(sym_table, id);
if(type_class == _CONST) {
fprintf(errorFile, "Error: Variable cannot be used before it is declared\n");
errorOccurred = 1;
return -1;
}
return get_data_type(sym_table, id);
}
break;
case NARRAY_VARIABLE:
x = ast->array_variable.index;
type = get_data_type(sym_table, ast->array_variable.id);
if(type == IVEC2 || type == IVEC3 || type == IVEC4 || type == BVEC2 || type == BVEC3 || type == BVEC4 || type == VEC2 || type == VEC3 || type == VEC4)
;
else {
fprintf(errorFile, "Error: Only 'vec' type supported\n");
errorOccurred = 1;
return -1;
}
if((type == IVEC2 && x < 2) || (type == IVEC3 && x < 3) || (type == IVEC4 && x < 4) || (type == BVEC2 && x < 2) || (type == BVEC3 && x < 3) || (type == BVEC4 && x < 4) || (type == VEC2 && x < 2) || (type == VEC3 && x < 3) || (type == VEC4 && x < 4))
;
else {
fprintf(errorFile, "Error: Index limit exceeded\n");
errorOccurred = 1;
return -1;
}
if(type == IVEC2 || type == IVEC3 || type == IVEC4)
return INT;
if(type == BVEC2 || type == BVEC3 || type == BVEC4)
return BOOL;
if(type == VEC2 || type == VEC3 || type == VEC4)
return FLOAT;
break;
case NARGS_ARGUMENTS:
lhs = semantic_check(ast->args_arguments.arguments);
if(lhs == -1)
return -1;
rhs = semantic_check(ast->args_arguments.expression);
if(rhs == -1)
return -1;
else if(lhs == rhs)
return lhs;
else {
fprintf(errorFile, "Error: Mismatch in arguments\n");
errorOccurred = 1;
return -1;
}
break;
case NEXPR_ARGUMENTS:
return semantic_check(ast->expr_arguments.expression);
break;
case NARGUMENTS_OPT:
return semantic_check(ast->arguments_opt.arguments);
break;
case NTYPE:
return ast->type.type_kind;
break;
case NPROG_SCOPE:
scopeNum++;
check_prog_scope = semantic_check(ast->prog_scope.scope);
scopeNum--;
return check_prog_scope;
break;
default:
return -1;
break;
}
return 0; // failed checks
}
/***********************************************************************
* Main program for the Compiler
**********************************************************************/
int main (int argc, char *argv[]) {
getOpts (argc, argv); /* Set up and apply command line options */
/***********************************************************************
* Compiler Initialization.
*
* If explicit initialization of any phase of the compilation is needed,
* calls to initialization routines in the applicable modules are placed
* here.
**********************************************************************/
errorOccurred = FALSE;
/***********************************************************************
* Start the Compilation
**********************************************************************/
if (dumpSource)
sourceDump();
/* Phase 1: Scanner. In phase 2 and after the following code should be
* removed */
/*
while (yylex())
if (errorOccurred)
break;
*/
/* Phase 2: Parser -- should allocate an AST, storing the reference in the
* global variable "ast", and build the AST there. */
if(1 == yyparse()) {
return 0; // parse failed
}
build_table(ast);
insert_predef();
//display();
if(semantic_check(ast)==-1){
//printf();
fprintf(stderr, "SYMANTIC CHECK FAILED\n");
}
/* Phase 3: Call the AST dumping routine if requested */
if (dumpAST)
ast_print(ast);
/* Phase 4: Add code to call the code generation routine */
/* TODO: call your code generation routine here */
if (errorOccurred)
fprintf(outputFile,"Failed to compile\n");
else
// genCode(ast);
;
/***********************************************************************
* Post Compilation Cleanup
**********************************************************************/
/* Make calls to any cleanup or finalization routines here. */
ast_free(ast);
/* Clean up files if necessary */
if (inputFile != DEFAULT_INPUT_FILE)
fclose (inputFile);
if (errorFile != DEFAULT_ERROR_FILE)
fclose (errorFile);
if (dumpFile != DEFAULT_DUMP_FILE)
fclose (dumpFile);
if (traceFile != DEFAULT_TRACE_FILE)
fclose (traceFile);
if (outputFile != DEFAULT_OUTPUT_FILE)
fclose (outputFile);
if (runInputFile != DEFAULT_RUN_INPUT_FILE)
fclose (runInputFile);
return 0;
}
