Attempt to fix potential compiler segfault in lookup.c #4191
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This attempts to fix issues ponylang#4130 and ponylang#4153. The issue was when a private type in another package was used as a default value in a method call. Fix to ponylang#4130 Since it has been decided to treat this as a bug instead of a missing error, this PR implements the fix suggested by @ergl, namely using `lookup_try()` instead of lookup() in call.c's `check_partial_function_call()` since it allows to permit private types. Fix to ponylang#4153 This is also a simply fix to lookup.c that prevents a potential segfault by a dereferencing of `opt` (`typecheck_t* t = &opt->check;`) *before* `opt != NULL` was checked. As pointed out by @SeanTAllen, opt should not be NULL to begin with when lookup_nominal is called, and instead, an assert should be added and the NULL checks in that function removed.
…ult values" This reverts commit 527864d.
This attempts to fix ponylang#4130 This crash stems from the use of a private type as defined in another package when it was used as a default value in a method call. Since it has been decided to treat this as a bug instead of a missing error, this PR implements the fix suggested by @ergl, namely using `lookup_try()` instead of lookup() in call.c's `check_partial_function_call()` since the former can be configured to permit private types. Fix to ponylang#4153 This is a simply change to `lookup_nominal()` in lookup.c that prevents a potential segfault by a dereferencing of `opt` (`typecheck_t* t = &opt->check;`) *before* `opt != NULL` was checked. As pointed out by @SeanTAllen, opt should not be NULL to begin with when `lookup_nominal()` is called, and instead, an assert should be added and the NULL checks in that function removed. With this PR, the two examples below that crashed the compiler now both compile: Original example: ```pony // inside the "useful" package primitive _PrivateDefault actor Useful[A: Any val] fun tag config(value: (A | _PrivateDefault) = _PrivateDefault): Useful[A] => this // inside "main" use "useful" primitive This primitive That type Stuff is (This | That) actor Main new create(env: Env) => let u = Useful[Stuff].config() ``` Minimal example: ```pony // In the "lib" pacakge primitive _Private primitive Public fun apply[T](v: (T | _Private) = _Private): None => None // In main use lib = "lib" actor Main new create(env: Env) => let p = lib.Public.apply[U8]() env.out.print(p.string()) ```
Adding release notes
…unction/main.pony Co-authored-by: Borja o'Cook <ergl@users.noreply.github.com>
Add release notes for ponylang#4173
Co-authored-by: Sean T Allen <sean@seantallen.com>
Co-authored-by: Sean T Allen <sean@seantallen.com>
Co-authored-by: Sean T Allen <sean@seantallen.com>
Co-authored-by: Sean T Allen <sean@seantallen.com>
Co-authored-by: Sean T Allen <sean@seantallen.com>
Co-authored-by: Sean T Allen <sean@seantallen.com>
Co-authored-by: Sean T Allen <sean@seantallen.com>
Co-authored-by: Sean T Allen <sean@seantallen.com>
Co-authored-by: Sean T Allen <sean@seantallen.com>
Co-authored-by: Sean T Allen <sean@seantallen.com>
Co-authored-by: Sean T Allen <sean@seantallen.com>
Co-authored-by: Sean T Allen <sean@seantallen.com>
Co-authored-by: Sean T Allen <sean@seantallen.com>
Co-authored-by: Sean T Allen <sean@seantallen.com>
Co-authored-by: Sean T Allen <sean@seantallen.com>
Co-authored-by: Sean T Allen <sean@seantallen.com>
Co-authored-by: Sean T Allen <sean@seantallen.com>
Include tests for ponylang#4174
Further small test improvement
Ouch -- USize overflow when `_size - src_index` < 0!
It is actually Ok if the `dst_idx == dst._size` (no gap)
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@stefandd I'm going to set this as a draft PR. |
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@stefandd please let us know when this is ready for review. |
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