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broader support for AST traversal, including Attr and Attributes objects

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Vern Paxson 2022-05-04 17:07:18 -07:00 • committed by Tim Wojtulewicz
parent 9a2200e60a
commit a0fc8ca5e4
10 changed files with 280 additions and 23 deletions
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17
src/Traverse.h
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@ -9,6 +9,7 @@ namespace zeek
{
class Func;
class Type;
namespace detail
{
@ -16,6 +17,8 @@ namespace detail
class Stmt;
class Expr;
class ID;
class Attributes;
class Attr;
class TraversalCallback
{
@ -41,6 +44,20 @@ public:
virtual TraversalCode PreDecl(const ID*) { return TC_CONTINUE; }
virtual TraversalCode PostDecl(const ID*) { return TC_CONTINUE; }
// A caution regarding using the next two: when traversing types,
// there's a possibility of encountering a (directly or indirectly)
// recursive record. So you'll need some way of avoiding that,
// such as remembering which types have already been traversed
// and skipping via TC_ABORTSTMT when seen again.
virtual TraversalCode PreType(const Type*) { return TC_CONTINUE; }
virtual TraversalCode PostType(const Type*) { return TC_CONTINUE; }
virtual TraversalCode PreAttrs(const Attributes*) { return TC_CONTINUE; }
virtual TraversalCode PostAttrs(const Attributes*) { return TC_CONTINUE; }
virtual TraversalCode PreAttr(const Attr*) { return TC_CONTINUE; }
virtual TraversalCode PostAttr(const Attr*) { return TC_CONTINUE; }
ScopePtr current_scope;
};