[PATCH v3 02/21] expression: init constexpr_flags at expression allocation

[Nicolai Stange <nicstange@gmail.com>]

Currently, the expression evaluation code explicitly opts out from
constness at evaluation if certain criteria regarding the subexpressions
are not matched.

Instead of this active opt-out, we want to have subexpression constness
attributes to get propagated from child expressions to their parents in
the future.

A prerequisite is that each expression's ->constexpr_flags is in a defined
state at all times.

Set ->constexpr_flags to CONSTEXPR_FLAG_NONE at expression allocation time,
i.e. in alloc_expression() as well as in alloc_const_expression().

Signed-off-by: Nicolai Stange <nicstange@gmail.com>
---
 expression.h | 2 ++
 1 file changed, 2 insertions(+)

diff --git a/expression.h b/expression.h
index 3725a73..8a943a4 100644
--- a/expression.h
+++ b/expression.h
@@ -255,6 +255,7 @@ static inline struct expression *alloc_expression(struct position pos, int type)
 	struct expression *expr = __alloc_expression(0);
 	expr->type = type;
 	expr->pos = pos;
+	expr->constexpr_flags = CONSTEXPR_FLAG_NONE;
 	return expr;
 }
 
@@ -265,6 +266,7 @@ static inline struct expression *alloc_const_expression(struct position pos, int
 	expr->pos = pos;
 	expr->value = value;
 	expr->ctype = &int_ctype;
+	expr->constexpr_flags = CONSTEXPR_FLAG_NONE;
 	return expr;
 }
 
-- 
2.7.0