iJavaC/semantic.c at master · DeepCoin/iJavaC · GitHub

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#include<stdio.h>
#include<stdlib.h>
#include<string.h>
#include"astNodes.h"
#include"show.h"
#include"symbols.h"
#include"semantic.h"
#include"exitClean.h"

char*currentMethod;
MethodTable*currentLocalTable;
externClassTable*symbolsTable;

char*opsOrig[] = {"+", "-", "*", "/", "%", "<", ">", "<=", ">=", "!=", "==", "!", ".length", "&&", "||"};

////
// Semantic error checking functions.
voidcheckMethodDecl(MethodDecl*);
voidcheckStmtList(StmtList*);
voidcheckStmt(Stmt*);
TypecheckExpr(Expr*);
intisValidIntLit(char*);

////
// Error functions.
voiderrorInvalidLiteral(char*);
voiderrorIncompatibleTypeInStatement(char*, Type, Type);
voiderrorIncompatibleTypeInStatement2(char*, Type, Type, Type);
voiderrorOperatorCannotBeApplied(char*, Type);
voiderrorOperatorCannotBeApplied2(char*, Type, Type);
voiderrorIncompatibleTypeInAssign(char*, Type, Type);
voiderrorIncompatibleTypeInAssignArray(char*, Type, Type);
voiderrorCannotFindSymbol(char*);
voiderrorIncompatibleArgument(int, char*, Type, Type);

voidcheckSemantics(Class*myProgram)
{
DeclList*aux=myProgram->declList;
for(; aux!=NULL; aux=aux->next)
if(aux->type==METHODDECL)
 {
currentMethod=aux->methodDecl->id;
currentLocalTable=getLocalTable(currentMethod);
checkStmtList(aux->methodDecl->stmtList);
 }
}

voidcheckStmtList(StmtList*stmtList)
{
StmtList*aux=stmtList;
for(; aux!=NULL; aux=aux->next)
checkStmt(aux->stmt);
}

voidcheckStmt(Stmt*stmt)
{
if(!stmt)
return;

Typet1, t2, t3;

if(stmt->type==CSTAT)
checkStmtList(stmt->stmtList);
elseif(stmt->type==IFELSE)
 {
t1=checkExpr(stmt->expr1);
if(t1!=BOOL_T) //ERROR
errorIncompatibleTypeInStatement("if", t1, BOOL_T);

checkStmt(stmt->stmt1);
checkStmt(stmt->stmt2);
 }
elseif(stmt->type==WHILE_T)
 {
t1=checkExpr(stmt->expr1);
if(t1!=BOOL_T) //ERROR
errorIncompatibleTypeInStatement("while", t1, BOOL_T);

checkStmt(stmt->stmt1);
 }
elseif(stmt->type==RETURN_T)
 {
t1=getMethodFromGlobal(currentMethod);
if(stmt->expr1)
t2=checkExpr(stmt->expr1);
else
t2=VOID_T;
if(t1!=t2) //ERROR
errorIncompatibleTypeInStatement("return", t2, t1);
 }
elseif(stmt->type==PRINT_T)
 {
t1=checkExpr(stmt->expr1);
if(t1!=BOOL_T&&t1!=INT_T) //ERROR
errorIncompatibleTypeInStatement2("System.out.println", t1, BOOL_T, INT_T);
 }
elseif(stmt->type==STORE)
 {
t1=getSymbolFromLocalOrGlobal(stmt->id);
t2=-1;
if(t1==t2)
errorCannotFindSymbol(stmt->id);

t2=checkExpr(stmt->expr1);
if(t1!=t2)
errorIncompatibleTypeInAssign(stmt->id, t2, t1);
 }
elseif(stmt->type==STOREARRAY)
 {
t1=getSymbolFromLocalOrGlobal(stmt->id);
t2=-1;
if(t1==t2)
errorCannotFindSymbol(stmt->id);

t2=checkExpr(stmt->expr1);
if((t1!=INTARRAY&&t1!=BOOLARRAY) ||t2!=INT_T) //ERROR
errorOperatorCannotBeApplied2("[", t1, t2);

if(t1==INTARRAY)
t3=INT_T;
else
t3=BOOL_T;

t2=checkExpr(stmt->expr2);
if(t3!=t2) //ERROR
errorIncompatibleTypeInAssignArray(stmt->id, t2, t3);
 }
}

TypecheckExpr(Expr*expr)
{
Typet1, t2;

if(expr->type==BINOP)
 {
switch(expr->op)
 {
casePLUS:
caseMINUS:
caseMUL:
caseDIV:
caseREM:
t1=checkExpr(expr->expr1);
t2=checkExpr(expr->expr2);
if(t1!=INT_T||t2!=INT_T) //ERROR
errorOperatorCannotBeApplied2(opsOrig[expr->op], t1, t2);
returnINT_T;
caseLESSER:
caseGREATER:
caseLEQ:
caseGEQ:
t1=checkExpr(expr->expr1);
t2=checkExpr(expr->expr2);
if(t1!=INT_T||t2!=INT_T) //ERROR
errorOperatorCannotBeApplied2(opsOrig[expr->op], t1, t2);
returnBOOL_T;
caseDIF:
caseEQ:
t1=checkExpr(expr->expr1);
t2=checkExpr(expr->expr2);
if(t1!=t2) //ERROR
errorOperatorCannotBeApplied2(opsOrig[expr->op], t1, t2);
returnBOOL_T;
caseAND_T:
caseOR_T:
t1=checkExpr(expr->expr1);
t2=checkExpr(expr->expr2);
if(t1!=BOOL_T||t2!=BOOL_T) //ERROR
errorOperatorCannotBeApplied2(opsOrig[expr->op], t1, t2);
returnBOOL_T;
 }
 }
elseif(expr->type==UNOP)
 {
if(expr->op==PLUS||expr->op==MINUS)
 {
t1=checkExpr(expr->expr1);
if(t1!=INT_T) //ERROR
errorOperatorCannotBeApplied(opsOrig[expr->op], t1);
returnINT_T;
 }
elseif(expr->op==NOT)
 {
t1=checkExpr(expr->expr1);
if(t1!=BOOL_T) //ERROR
errorOperatorCannotBeApplied(opsOrig[expr->op], t1);
returnBOOL_T;
 }
elseif(expr->op==DOTLENGTH_T)
 {
t1=checkExpr(expr->expr1);
if(t1!=INTARRAY&&t1!=BOOLARRAY&&t1!=STRINGARRAY) //ERROR
errorOperatorCannotBeApplied(opsOrig[expr->op], t1);
returnINT_T;
 }
 }
elseif(expr->type==ID_T)
 {
Typer, notFound=-1;
r=getSymbolFromLocalOrGlobal(expr->idOrLit);
if(r==notFound)
errorCannotFindSymbol(expr->idOrLit);
returnr;
 }
elseif(expr->type==INTLIT_T)
 {
if(!isValidIntLit(expr->idOrLit)) //ERROR
errorInvalidLiteral(expr->idOrLit);

returnINT_T;
 }
elseif(expr->type==BOOLLIT_T)
returnBOOL_T;
elseif(expr->type==CALL)
 {
MethodTable*t=getLocalTable(expr->idOrLit);
if(t==NULL)
errorCannotFindSymbol(expr->idOrLit);

intargNum=0;
ArgsList*auxArgs=expr->argsList;
MethodTableEntry*auxParams=t->entries;
while(auxArgs!=NULL||auxParams!=NULL)
 {
t1=VOID_T;
if(auxArgs!=NULL)
 {
t1=checkExpr(auxArgs->expr);
auxArgs=auxArgs->next;
 }

t2=VOID_T;
if(auxParams!=NULL)
 {
t2=auxParams->type;
auxParams=auxParams->next;
if(auxParams&& !auxParams->isParam)
auxParams=NULL;
 }

if(t1!=t2) //ERROR
errorIncompatibleArgument(argNum, expr->idOrLit, t1, t2);

argNum++;
 }

returngetMethodFromGlobal(expr->idOrLit);
 }
elseif(expr->type==PARSEINT_T)
 {
t1=getSymbolFromLocalOrGlobal(expr->idOrLit);
t2=-1;
if(t1==t2)
errorCannotFindSymbol(expr->idOrLit);

t2=checkExpr(expr->expr1);
if(t1!=STRINGARRAY||t2!=INT_T) //ERROR
errorOperatorCannotBeApplied2("Integer.parseInt", t1, t2);

returnINT_T;
 }
elseif(expr->type==INDEX)
 {
t1=checkExpr(expr->expr1);
t2=checkExpr(expr->expr2);
if((t1!=INTARRAY&&t1!=BOOLARRAY) ||t2!=INT_T) //ERROR
errorOperatorCannotBeApplied2("[", t1, t2);

if(t1==INTARRAY)
returnINT_T;
else
returnBOOL_T;
 }
elseif(expr->type==NEWINTARR)
 {
t1=checkExpr(expr->expr1);
if(t1!=INT_T)
errorOperatorCannotBeApplied("new int", t1);
returnINTARRAY;
 }
elseif(expr->type==NEWBOOLARR)
 {
t1=checkExpr(expr->expr1);
if(t1!=INT_T)
errorOperatorCannotBeApplied("new boolean", t1);
returnBOOLARRAY;
 }
}

intisValidIntLit(char*intlit)
{
intlen=strlen(intlit);
if(intlit[0] !='0')
return1;

if(len >= 1&&intlit[0] =='0'&&intlit[1] =='x')
return1;

inti;
for(i=1; i<len; i++)
if(intlit[i] =='9'||intlit[i] =='8')
return0;

return1;
}

////
// Error functions.
voiderrorInvalidLiteral(char*lit)
{
printf("Invalid literal %s\n", lit);
exitClean(0);
}

voiderrorIncompatibleTypeInStatement(char*stmt, Typet, Typer)
{
chartypeT[TYPE_SIZE], typeR[TYPE_SIZE];
typeToStringST(t, typeT);
typeToStringST(r, typeR);

printf("Incompatible type in %s statement (got %s, required %s)\n", stmt, typeT, typeR);

exitClean(0);
}

voiderrorIncompatibleTypeInStatement2(char*stmt, Typeg, Typer1, Typer2)
{
chartypeG[TYPE_SIZE], typeR1[TYPE_SIZE], typeR2[TYPE_SIZE];
typeToStringST(g, typeG);
typeToStringST(r1, typeR1);
typeToStringST(r2, typeR2);

printf("Incompatible type in %s statement (got %s, required %s or %s)\n", stmt, typeG, typeR1, typeR2);

exitClean(0);
}

voiderrorOperatorCannotBeApplied(char*op, Typet)
{
chartype[TYPE_SIZE];
typeToStringST(t, type);

printf("Operator %s cannot be applied to type %s\n", op, type);

exitClean(0);
}

voiderrorOperatorCannotBeApplied2(char*op, Typet1, Typet2)
{
chartype1[TYPE_SIZE], type2[TYPE_SIZE];
typeToStringST(t1, type1);
typeToStringST(t2, type2);

printf("Operator %s cannot be applied to types %s, %s\n", op, type1, type2);

exitClean(0);
}

voiderrorIncompatibleTypeInAssign(char*id, Typegot, Typereq)
{
chartypeGot[TYPE_SIZE], typeReq[TYPE_SIZE];
typeToStringST(got, typeGot);
typeToStringST(req, typeReq);

printf("Incompatible type in assignment to %s (got %s, required %s)\n", id, typeGot, typeReq);

exitClean(0);
}

voiderrorIncompatibleTypeInAssignArray(char*id, Typegot, Typereq)
{
chartypeGot[TYPE_SIZE], typeReq[TYPE_SIZE];
typeToStringST(got, typeGot);
typeToStringST(req, typeReq);

printf("Incompatible type in assignment to %s[] (got %s, required %s)\n", id, typeGot, typeReq);

exitClean(0);
}

voiderrorIncompatibleArgument(intargNum, char*id, Typeg, Typer)
{
chartypeG[TYPE_SIZE], typeR[TYPE_SIZE];
typeToStringST(g, typeG);
typeToStringST(r, typeR);

printf("Incompatible type of argument %d in call to method %s (got %s, required %s)\n", argNum, id, typeG, typeR);

exitClean(0);
}

voiderrorCannotFindSymbol(char*id)
{
printf("Cannot find symbol %s\n", id);

exitClean(0);
}