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Error when lvalues are requested where that's not possible

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Wolfgang (Blub) Bumiller 2012-10-30 21:15:42 +01:00
parent 0ca2807096
commit 62f55d5155
1 changed files with 28 additions and 13 deletions
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41
ast.c
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@ -1082,7 +1082,11 @@ bool ast_block_codegen(ast_block *self, ast_function *func, bool lvalue, ir_valu
* Note: an ast-representation using the comma-operator
* of the form: (a, b, c) = x should not assign to c...
*/
(void)lvalue;
if (lvalue) {
asterror(ast_ctx(self), "not an l-value (code-block)");
return false;
}
if (self->expression.outr) {
*out = self->expression.outr;
return true;
@ -1165,10 +1169,12 @@ bool ast_binary_codegen(ast_binary *self, ast_function *func, bool lvalue, ir_va
ast_expression_codegen *cgen;
ir_value *left, *right;
/* In the context of a binary operation, we can disregard
* the lvalue flag.
*/
(void)lvalue;
/* A binary operation cannot yield an l-value */
if (lvalue) {
asterror(ast_ctx(self), "not an l-value (binop)");
return false;
}
if (self->expression.outr) {
*out = self->expression.outr;
return true;
@ -1252,10 +1258,12 @@ bool ast_unary_codegen(ast_unary *self, ast_function *func, bool lvalue, ir_valu
ast_expression_codegen *cgen;
ir_value *operand;
/* In the context of a unary operation, we can disregard
* the lvalue flag.
*/
(void)lvalue;
/* An unary operation cannot yield an l-value */
if (lvalue) {
asterror(ast_ctx(self), "not an l-value (binop)");
return false;
}
if (self->expression.outr) {
*out = self->expression.outr;
return true;
@ -1280,10 +1288,14 @@ bool ast_return_codegen(ast_return *self, ast_function *func, bool lvalue, ir_va
ast_expression_codegen *cgen;
ir_value *operand;
/* In the context of a return operation, we can disregard
* the lvalue flag.
/* In the context of a return operation, we don't actually return
* anything...
*/
(void)lvalue;
if (lvalue) {
asterror(ast_ctx(self), "return-expression is not an l-value");
return false;
}
if (self->expression.outr) {
asterror(ast_ctx(self), "internal error: ast_return cannot be reused, it bears no result!");
return false;
@ -1832,7 +1844,10 @@ bool ast_call_codegen(ast_call *self, ast_function *func, bool lvalue, ir_value
ir_value *funval = NULL;
/* return values are never lvalues */
(void)lvalue;
if (lvalue) {
asterror(ast_ctx(self), "not an l-value (function call)");
return false;
}
if (self->expression.outr) {
*out = self->expression.outr;