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Fix reference counting issues related to lambdas/closures

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For example, circular references between a lambda function the frame
it's stored within and/or its closure could cause memory leaks.

This also fixes other various reference-count ownership issues that
could lead to memory errors.

There may still be some potential/undiscovered issues because the "outer
ID" finding logic doesn't look quite right as the AST traversal descends
within nested lambdas and considers their locals as "outer", but
possibly the other logic for locating values in closures or cloning
closures just works around that behavior.
This commit is contained in:
Jon Siwek 2020-01-01 12:13:02 -08:00
parent 0fe2a14d98
commit 44d922c4b5
11 changed files with 283 additions and 78 deletions
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5
src/Var.h
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@ -26,11 +26,6 @@ extern void begin_func(ID* id, const char* module_name, function_flavor flavor,
int is_redef, FuncType* t, attr_list* attrs = nullptr);
extern void end_func(Stmt* body);
// Gathers all of the information from a scope and a function body needed to
// build a function and collects it into a function_ingredients struct.
// Gathered elements are not refeed.
extern std::unique_ptr<function_ingredients> gather_function_ingredients(Scope* scope, Stmt* body);
// Gather all IDs referenced inside a body that aren't part of a given scope.
extern id_list gather_outer_ids(Scope* scope, Stmt* body);