int lineno;
int block;
int scopeLevel;
-int lvaluereq;
symbol *returnLabel; /* function return label */
symbol *entryLabel; /* function entry label */
/* forward definition of some functions */
operand *geniCodeDivision (operand *, operand *);
operand *geniCodeAssign (operand *, operand *, int);
-operand *geniCodeArray (operand *, operand *);
+operand *geniCodeArray (operand *, operand *,int);
operand *geniCodeArray2Ptr (operand *);
operand *geniCodeRValue (operand *, bool);
-operand *geniCodeDerefPtr (operand *);
+operand *geniCodeDerefPtr (operand *,int);
#define PRINTFUNC(x) void x (FILE *of, iCode *ic, char *s)
/* forward definition of ic print functions */
/* operandFromAst - creates an operand from an ast */
/*-----------------------------------------------------------------*/
operand *
-operandFromAst (ast * tree)
+operandFromAst (ast * tree,int lvl)
{
if (!tree)
switch (tree->type)
{
case EX_OP:
- return ast2iCode (tree);
+ return ast2iCode (tree,lvl+1);
break;
case EX_VALUE:
/* geniCodeAdd - generates iCode for addition */
/*-----------------------------------------------------------------*/
operand *
-geniCodeAdd (operand * left, operand * right)
+geniCodeAdd (operand * left, operand * right,int lvl)
{
iCode *ic;
sym_link *resType;
/* if left is an array then array access */
if (IS_ARRAY (ltype))
- return geniCodeArray (left, right);
+ return geniCodeArray (left, right,lvl);
/* if the right side is LITERAL zero */
/* return the left side */
/* geniCodeArray - array access */
/*-----------------------------------------------------------------*/
operand *
-geniCodeArray (operand * left, operand * right)
+geniCodeArray (operand * left, operand * right,int lvl)
{
iCode *ic;
sym_link *ltype = operandType (left);
{
left = geniCodeRValue (left, FALSE);
}
- return geniCodeDerefPtr (geniCodeAdd (left, right));
+ return geniCodeDerefPtr (geniCodeAdd (left, right,lvl),lvl);
}
right = geniCodeMultiply (right,
/* geniCodeDerefPtr - dereference pointer with '*' */
/*-----------------------------------------------------------------*/
operand *
-geniCodeDerefPtr (operand * op)
+geniCodeDerefPtr (operand * op,int lvl)
{
sym_link *rtype, *retype;
sym_link *optype = operandType (op);
}
/* now get rid of the pointer part */
- if (lvaluereq && IS_ITEMP (op))
+ if (isLvaluereq(lvl) && IS_ITEMP (op))
{
retype = getSpec (rtype = copyLinkChain (optype));
}
IS_CHAR (rtype) ||
IS_FLOAT (rtype));
- if (!lvaluereq)
+ if (!isLvaluereq(lvl))
op = geniCodeRValue (op, TRUE);
setOperandType (op, rtype);
/* geniCodeConditional - geniCode for '?' ':' operation */
/*-----------------------------------------------------------------*/
operand *
-geniCodeConditional (ast * tree)
+geniCodeConditional (ast * tree,int lvl)
{
iCode *ic;
symbol *falseLabel = newiTempLabel (NULL);
symbol *exitLabel = newiTempLabel (NULL);
- operand *cond = ast2iCode (tree->left);
+ operand *cond = ast2iCode (tree->left,lvl+1);
operand *true, *false, *result;
ic = newiCodeCondition (geniCodeRValue (cond, FALSE),
NULL, falseLabel);
ADDTOCHAIN (ic);
- true = ast2iCode (tree->right->left);
+ true = ast2iCode (tree->right->left,lvl+1);
/* move the value to a new Operand */
result = newiTempOperand (operandType (true), 0);
/* now for the right side */
geniCodeLabel (falseLabel);
- false = ast2iCode (tree->right->right);
+ false = ast2iCode (tree->right->right,lvl+1);
geniCodeAssign (result, geniCodeRValue (false, FALSE), 0);
/* create the exit label */
/* geniCodeSEParms - generate code for side effecting fcalls */
/*-----------------------------------------------------------------*/
static void
-geniCodeSEParms (ast * parms)
+geniCodeSEParms (ast * parms,int lvl)
{
if (!parms)
return;
if (parms->type == EX_OP && parms->opval.op == PARAM)
{
- geniCodeSEParms (parms->left);
- geniCodeSEParms (parms->right);
+ geniCodeSEParms (parms->left,lvl);
+ geniCodeSEParms (parms->right,lvl);
return;
}
parms->right->left->lvalue = 1;
parms->opval.oprnd =
- geniCodeRValue (ast2iCode (parms), FALSE);
+ geniCodeRValue (ast2iCode (parms,lvl+1), FALSE);
parms->type = EX_OPERAND;
}
/* geniCodeParms - generates parameters */
/*-----------------------------------------------------------------*/
static void
-geniCodeParms (ast * parms, int *stack, sym_link * fetype, symbol * func)
+geniCodeParms (ast * parms, int *stack, sym_link * fetype, symbol * func,int lvl)
{
iCode *ic;
operand *pval;
/* if this is a param node then do the left & right */
if (parms->type == EX_OP && parms->opval.op == PARAM)
{
- geniCodeParms (parms->left, stack, fetype, func);
- geniCodeParms (parms->right, stack, fetype, func);
+ geniCodeParms (parms->left, stack, fetype, func,lvl);
+ geniCodeParms (parms->right, stack, fetype, func,lvl);
return;
}
IS_ADDRESS_OF_OP (parms->right))
parms->right->left->lvalue = 1;
- pval = geniCodeRValue (ast2iCode (parms), FALSE);
+ pval = geniCodeRValue (ast2iCode (parms,lvl+1), FALSE);
}
/* if register parm then make it a send */
/* geniCodeCall - generates temp code for calling */
/*-----------------------------------------------------------------*/
operand *
-geniCodeCall (operand * left, ast * parms)
+geniCodeCall (operand * left, ast * parms,int lvl)
{
iCode *ic;
operand *result;
/* take care of parameters with side-effecting
function calls in them, this is required to take care
of overlaying function parameters */
- geniCodeSEParms (parms);
+ geniCodeSEParms (parms,lvl);
/* first the parameters */
- geniCodeParms (parms, &stack, getSpec (operandType (left)), OP_SYMBOL (left));
+ geniCodeParms (parms, &stack, getSpec (operandType (left)), OP_SYMBOL (left),lvl);
/* now call : if symbol then pcall */
if (IS_OP_POINTER (left) || IS_ITEMP(left))
/* geniCodeFunctionBody - create the function body */
/*-----------------------------------------------------------------*/
void
-geniCodeFunctionBody (ast * tree)
+geniCodeFunctionBody (ast * tree,int lvl)
{
iCode *ic;
operand *func;
iTempLblNum = 0;
operandKey = 0;
iCodeKey = 0;
- func = ast2iCode (tree->left);
+ func = ast2iCode (tree->left,lvl+1);
fetype = getSpec (operandType (func));
savelineno = lineno;
geniCodeReceive (tree->values.args);
/* generate code for the body */
- ast2iCode (tree->right);
+ ast2iCode (tree->right,lvl+1);
/* create a label for return */
geniCodeLabel (returnLabel);
/* geniCodeIfx - generates code for extended if statement */
/*-----------------------------------------------------------------*/
void
-geniCodeIfx (ast * tree)
+geniCodeIfx (ast * tree,int lvl)
{
iCode *ic;
- operand *condition = ast2iCode (tree->left);
+ operand *condition = ast2iCode (tree->left,lvl+1);
sym_link *cetype;
/* if condition is null then exit */
}
exit:
- ast2iCode (tree->right);
+ ast2iCode (tree->right,lvl+1);
}
/*-----------------------------------------------------------------*/
/* geniCodeSwitch - changes a switch to a if statement */
/*-----------------------------------------------------------------*/
void
-geniCodeSwitch (ast * tree)
+geniCodeSwitch (ast * tree,int lvl)
{
iCode *ic;
- operand *cond = geniCodeRValue (ast2iCode (tree->left), FALSE);
+ operand *cond = geniCodeRValue (ast2iCode (tree->left,lvl+1), FALSE);
value *caseVals = tree->values.switchVals.swVals;
symbol *trueLabel, *falseLabel;
geniCodeGoto (falseLabel);
jumpTable:
- ast2iCode (tree->right);
+ ast2iCode (tree->right,lvl+1);
}
/*-----------------------------------------------------------------*/
ADDTOCHAIN (ic);
}
+/*-----------------------------------------------------------------*/
+/* Stuff used in ast2iCode to modify geniCodeDerefPtr in some */
+/* particular case. Ie : assigning or dereferencing array or ptr */
+/*-----------------------------------------------------------------*/
+set * lvaluereqSet = NULL;
+typedef struct lvalItem
+ {
+ int req;
+ int lvl;
+ }
+lvalItem;
+
+/*-----------------------------------------------------------------*/
+/* addLvaluereq - add a flag for lvalreq for current ast level */
+/*-----------------------------------------------------------------*/
+void addLvaluereq(int lvl)
+{
+ lvalItem * lpItem = (lvalItem *)Safe_calloc (1, sizeof (lvalItem));
+ lpItem->req=1;
+ lpItem->lvl=lvl;
+ addSetHead(&lvaluereqSet,lpItem);
+
+}
+/*-----------------------------------------------------------------*/
+/* delLvaluereq - del a flag for lvalreq for current ast level */
+/*-----------------------------------------------------------------*/
+void delLvaluereq()
+{
+ lvalItem * lpItem;
+ lpItem = getSet(&lvaluereqSet);
+ if(lpItem) free(lpItem);
+}
+/*-----------------------------------------------------------------*/
+/* clearLvaluereq - clear lvalreq flag */
+/*-----------------------------------------------------------------*/
+void clearLvaluereq()
+{
+ lvalItem * lpItem;
+ lpItem = peekSet(lvaluereqSet);
+ if(lpItem) lpItem->req = 0;
+}
+/*-----------------------------------------------------------------*/
+/* getLvaluereq - get the last lvalreq level */
+/*-----------------------------------------------------------------*/
+int getLvaluereqLvl()
+{
+ lvalItem * lpItem;
+ lpItem = peekSet(lvaluereqSet);
+ if(lpItem) return lpItem->lvl;
+ return 0;
+}
+/*-----------------------------------------------------------------*/
+/* isLvaluereq - is lvalreq valid for this level ? */
+/*-----------------------------------------------------------------*/
+int isLvaluereq(int lvl)
+{
+ lvalItem * lpItem;
+ lpItem = peekSet(lvaluereqSet);
+ if(lpItem) return ((lpItem->req)&&(lvl <= (lpItem->lvl+1)));
+ return 0;
+}
+
/*-----------------------------------------------------------------*/
/* ast2iCode - creates an icodeList from an ast */
/*-----------------------------------------------------------------*/
operand *
-ast2iCode (ast * tree)
+ast2iCode (ast * tree,int lvl)
{
operand *left = NULL;
operand *right = NULL;
-
if (!tree)
return NULL;
-
/* set the global variables for filename & line number */
if (tree->filename)
filename = tree->filename;
/* if we find a nullop */
if (tree->type == EX_OP &&
- (tree->opval.op == NULLOP ||
- tree->opval.op == BLOCK))
+ (tree->opval.op == NULLOP ||
+ tree->opval.op == BLOCK))
{
- ast2iCode (tree->left);
- ast2iCode (tree->right);
+ ast2iCode (tree->left,lvl+1);
+ ast2iCode (tree->right,lvl+1);
return NULL;
}
tree->opval.op != INLINEASM)
{
- if (IS_ASSIGN_OP (tree->opval.op) ||
- IS_DEREF_OP (tree) ||
- (tree->opval.op == '&' && !tree->right) ||
- tree->opval.op == PTR_OP)
- {
- lvaluereq++;
- if ((IS_ARRAY_OP (tree->left) && IS_ARRAY_OP (tree->left->left)) ||
- (IS_DEREF_OP (tree) && IS_ARRAY_OP (tree->left)))
- {
- int olvr = lvaluereq;
- lvaluereq = 0;
- left = operandFromAst (tree->left);
- lvaluereq = olvr - 1;
- }
- else
- {
- left = operandFromAst (tree->left);
- lvaluereq--;
- }
- if (IS_DEREF_OP (tree) && IS_DEREF_OP (tree->left))
- left = geniCodeRValue (left, TRUE);
- }
- else
- {
- left = operandFromAst (tree->left);
- }
- if (tree->opval.op == INC_OP ||
- tree->opval.op == DEC_OP)
- {
- lvaluereq++;
- right = operandFromAst (tree->right);
- lvaluereq--;
- }
- else
- {
- right = operandFromAst (tree->right);
- }
- }
+ if (IS_ASSIGN_OP (tree->opval.op) ||
+ IS_DEREF_OP (tree) ||
+ (tree->opval.op == '&' && !tree->right) ||
+ tree->opval.op == PTR_OP)
+ {
+ addLvaluereq(lvl);
+ if ((IS_ARRAY_OP (tree->left) && IS_ARRAY_OP (tree->left->left)) ||
+ (IS_DEREF_OP (tree) && IS_ARRAY_OP (tree->left)))
+ clearLvaluereq();
+
+ left = operandFromAst (tree->left,lvl);
+ delLvaluereq();
+ if (IS_DEREF_OP (tree) && IS_DEREF_OP (tree->left))
+ left = geniCodeRValue (left, TRUE);
+ }
+ else
+ {
+ left = operandFromAst (tree->left,lvl);
+ }
+ if (tree->opval.op == INC_OP ||
+ tree->opval.op == DEC_OP)
+ {
+ addLvaluereq(lvl);
+ right = operandFromAst (tree->right,lvl);
+ delLvaluereq();
+ }
+ else
+ {
+ right = operandFromAst (tree->right,lvl);
+ }
+ }
/* now depending on the type of operand */
/* this will be a biggy */
right = geniCodeRValue (right, TRUE);
}
- return geniCodeArray (left, right);
+ return geniCodeArray (left, right,lvl);
case '.': /* structure dereference */
if (IS_PTR (operandType (left)))
return geniCodeMultiply (geniCodeRValue (left, FALSE),
geniCodeRValue (right, FALSE),IS_INT(tree->ftype));
else
- return geniCodeDerefPtr (geniCodeRValue (left, FALSE));
+ return geniCodeDerefPtr (geniCodeRValue (left, FALSE),lvl);
case '-':
if (right)
case '+':
if (right)
return geniCodeAdd (geniCodeRValue (left, FALSE),
- geniCodeRValue (right, FALSE));
+ geniCodeRValue (right, FALSE),lvl);
else
return geniCodeRValue (left, FALSE); /* unary '+' has no meaning */
geniCodeRValue (right, FALSE),
tree->opval.op);
case '?':
- return geniCodeConditional (tree);
+ return geniCodeConditional (tree,lvl);
case SIZEOF:
return operandFromLit (getSize (tree->right->ftype));
return geniCodeAssign (left,
geniCodeAdd (geniCodeRValue (operandFromOperand (left),
FALSE),
- right), 0);
+ right,lvl), 0);
}
case SUB_ASSIGN:
{
return geniCodeRValue (right, FALSE);
case CALL:
- return geniCodeCall (ast2iCode (tree->left),
- tree->right);
+ return geniCodeCall (ast2iCode (tree->left,lvl+1),
+ tree->right,lvl);
case LABEL:
- geniCodeLabel (ast2iCode (tree->left)->operand.symOperand);
- return ast2iCode (tree->right);
+ geniCodeLabel (ast2iCode (tree->left,lvl+1)->operand.symOperand);
+ return ast2iCode (tree->right,lvl+1);
case GOTO:
- geniCodeGoto (ast2iCode (tree->left)->operand.symOperand);
- return ast2iCode (tree->right);
+ geniCodeGoto (ast2iCode (tree->left,lvl+1)->operand.symOperand);
+ return ast2iCode (tree->right,lvl+1);
case FUNCTION:
- geniCodeFunctionBody (tree);
+ geniCodeFunctionBody (tree,lvl);
return NULL;
case RETURN:
return NULL;
case IFX:
- geniCodeIfx (tree);
+ geniCodeIfx (tree,lvl);
return NULL;
case SWITCH:
- geniCodeSwitch (tree);
+ geniCodeSwitch (tree,lvl);
return NULL;
case INLINEASM:
{
returnLabel = newiTempLabel ("_return");
entryLabel = newiTempLabel ("_entry");
- ast2iCode (tree);
+ ast2iCode (tree,0);
return reverseiCChain ();
}
projects / fw / sdcc / commitdiff