aboutsummaryrefslogtreecommitdiff
diff options
context:
space:
mode:
authorTeddy <[email protected]>2014-04-05 03:18:12 +0800
committerTeddy <[email protected]>2014-04-05 03:18:12 +0800
commit3112a26c6818fc208342db3a624d6e0b93d39dbd (patch)
tree27fbb9f03f74170cc7d317ecf26f15e68a9f7c7c
parentea1ded0a422b2cf784c7cc5e014345621dfb49fb (diff)
cast expression
-rw-r--r--semantics.c105
1 files changed, 93 insertions, 12 deletions
diff --git a/semantics.c b/semantics.c
index 1d0816c..43b4db0 100644
--- a/semantics.c
+++ b/semantics.c
@@ -427,6 +427,33 @@ CVar_t semantics_p_decl(CNode *p, CScope_t scope) {
scope);
}
+CType_t semantics_type_name(CNode *p, CScope_t scope) {
+ CNode *t, *ast;
+ CType_t tt, type;
+ if (p->type == TYPE_SPEC)
+ {
+ type = semantics_type_spec(p, scope);
+ ast = p;
+ }
+ else
+ {
+ type = ctype_create("", CPTR, p); /* pointer */
+ for (t = p, tt = type;; t = t->chd)
+ {
+ if (t->chd->type == TYPE_SPEC)
+ {
+ tt->rec.ref = semantics_type_spec(t->chd, scope);
+ ast = t;
+ break;
+ }
+ tt->rec.ref = ctype_create("", CPTR, t);
+ tt = tt->rec.ref;
+ }
+ }
+ type->ast = ast;
+ return type;
+}
+
CVar_t semantics_params(CNode *p, CScope_t scope) {
CHECK_TYPE(p, PARAMS);
p = p->chd;
@@ -603,7 +630,18 @@ CVar_t semantics_decl(CNode *p, CScope_t scope) {
ERROR(ast); \
} while (0)
+#define NOT_IGNORE_VOID(et, ast) \
+ if (et.type->type == CVOID) \
+ do \
+ { \
+ sprintf(err_buff, "void value not ignored as it ought to be"); \
+ ERROR(ast); \
+ } while (0)
+
+
ExpType exp_check_aseq(ExpType lhs, ExpType rhs, CNode *ast) {
+ NOT_IGNORE_VOID(lhs, ast);
+ NOT_IGNORE_VOID(rhs, ast);
switch (lhs.type->type)
{
case CSTRUCT: case CUNION:
@@ -654,6 +692,8 @@ ExpType exp_check_arith(ExpType op1, ExpType op2, CNode *ast) {
int t1 = op1.type->type,
t2 = op2.type->type;
ExpType res;
+ NOT_IGNORE_VOID(op1, ast);
+ NOT_IGNORE_VOID(op2, ast);
res.lval = 0;
res.type = basic_type_int;
if (!(IS_ARITH(t1) && IS_ARITH(t2)))
@@ -668,6 +708,8 @@ ExpType exp_check_bitwise(ExpType op1, ExpType op2, CNode *ast) {
int t1 = op1.type->type,
t2 = op2.type->type;
ExpType res;
+ NOT_IGNORE_VOID(op1, ast);
+ NOT_IGNORE_VOID(op2, ast);
res.lval = 0;
res.type = basic_type_int;
if (!(IS_INT(t1) && IS_INT(t2)))
@@ -681,6 +723,8 @@ ExpType exp_check_bitwise(ExpType op1, ExpType op2, CNode *ast) {
ExpType exp_check_add(ExpType op1, ExpType op2, CNode *ast, int sub) {
int t1 = op1.type->type,
t2 = op2.type->type;
+ NOT_IGNORE_VOID(op1, ast);
+ NOT_IGNORE_VOID(op2, ast);
if (!sub && t2 == CPTR)
{
/* place the pointer type in the first place */
@@ -714,6 +758,8 @@ ExpType exp_check_logical(ExpType op1, ExpType op2, CNode *ast) {
int t1 = op1.type->type,
t2 = op2.type->type;
ExpType res;
+ NOT_IGNORE_VOID(op1, ast);
+ NOT_IGNORE_VOID(op2, ast);
res.lval = 0;
res.type = basic_type_int;
if (!(IS_SCALAR(t1) && IS_SCALAR(t2)))
@@ -725,6 +771,8 @@ ExpType exp_check_logical(ExpType op1, ExpType op2, CNode *ast) {
}
ExpType exp_check_ass(ExpType lhs, ExpType rhs, CNode *p) {
+ NOT_IGNORE_VOID(lhs, p);
+ NOT_IGNORE_VOID(rhs, p);
if (!lhs.lval)
{
sprintf(err_buff, "lvalue required as left operand of assignment");
@@ -753,6 +801,8 @@ ExpType exp_check_equality(ExpType op1, ExpType op2, CNode *ast) {
int t1 = op1.type->type,
t2 = op2.type->type;
ExpType res;
+ NOT_IGNORE_VOID(op1, ast);
+ NOT_IGNORE_VOID(op2, ast);
res.lval = 0;
res.type = basic_type_int;
if (IS_ARITH(t1) && IS_ARITH(t2))
@@ -792,7 +842,7 @@ ExpType semantics_exp(CNode *p, CScope_t scope) {
res.lval = 1;
break;
case INT:
- p->ext.type = res.type = basic_type_int;
+ res.type = basic_type_int;
res.lval = 0;
break;
case CHAR:
@@ -803,18 +853,22 @@ ExpType semantics_exp(CNode *p, CScope_t scope) {
{
CType_t type = ctype_create("", CPTR, NULL);
type->rec.ref = basic_type_char;
- p->ext.type = res.type = type;
+ res.type = type;
}
case EXP:
{
- ExpType op1 = semantics_exp(p->chd, scope);
+ ExpType op1;
ExpType op2;
- if (p->chd->next)
- op2 = semantics_exp(p->chd->next, scope);
+ if (p->rec.subtype != EXP_CAST)
+ {
+ op1 = semantics_exp(p->chd, scope);
+ if (p->chd->next)
+ op2 = semantics_exp(p->chd->next, scope);
+ }
switch (p->rec.subtype)
{
/* following cases are binary expressions */
- case ',': return op2;
+ case ',': res = op2; break;
case '=' :
case ASS_MUL:
case ASS_DIV:
@@ -826,20 +880,47 @@ ExpType semantics_exp(CNode *p, CScope_t scope) {
case ASS_AND:
case ASS_XOR:
case ASS_OR:
- return exp_check_ass(op1, op2, p);
+ res = exp_check_ass(op1, op2, p);
+ break;
case OPT_OR:
case OPT_AND:
- return exp_check_logical(op1, op2, p);
- case '|': case '^': case '&':
- return exp_check_bitwise(op1, op2, p);
- case OPT_EQ: case OPT_NE:
- return exp_check_equality(op1, op2, p);
+ res = exp_check_logical(op1, op2, p);
+ break;
+ case OPT_SHL:
+ case OPT_SHR:
+ case '|':
+ case '^':
+ case '&':
+ res = exp_check_bitwise(op1, op2, p);
+ break;
+ case OPT_EQ:
+ case OPT_NE:
+ case '<':
+ case '>' :
+ case OPT_LE:
+ case OPT_GE:
+ res = exp_check_equality(op1, op2, p);
+ break;
+ case '+':
+ res = exp_check_add(op1, op2, p, 0);
+ break;
+ case '-':
+ res = exp_check_add(op1, op2, p, 1);
+ break;
+ case '*': case '/': case '%':
+ res = exp_check_arith(op1, op2, p);
+ break;
+ case EXP_CAST:
+ res.type = semantics_type_name(p->chd, scope);
+ res.lval = 0;
+ break;
default: assert(0);
}
}
break;
default: assert(0);
}
+ p->ext.type = res.type;
return res;
}