This includes various fixes/improvements to the C backend to improve
error/union support. It also fixes up our handling of decls, where some
decls were not correctly marked alive.
This is from discussions from #11249. The stage2 behavior is correct and
is strictly more accurate, so we'd prefer to keep it. In that case, I
modified the behavior tests to have the conditional between
stage1/stage2 and get this test passing.
This commit adds a new optional argument to several Value methods which
provides the ability to resolve types if it comes to it. This prevents
having duplicated logic inside both Sema and Value.
With this commit, the "struct contains slice of itself" test is passing
by exploiting the new lazy_align Value Tag.
* Use `@Vector` syntax instead of `std.meta.Vector`.
* Use `var` instead of `const` for tests so that we get runtime
coverage instead of only comptime coverage. Comptime coverage is done
with `comptime doTheTest()` calls.
the 3 tests that called `testArray2DConstDoublePtr` started passing
after implementing `ptr_elem_val`. the rest of these I think were
already passing before.
* Identify the ones that are passing and stop skipping them.
* Flatten out the main behavior.zig file and have each individual test
disable itself if it is not passing.
* make it always return a fully qualified name. stage1 is inconsistent
about this.
* AstGen: fix anon_name_strategy to correctly be `func` when anon type
creation happens in the operand of the return expression.
* Sema: implement type names for the "function" naming strategy.
* Put "enum", "union", "opaque", or "struct" in place of "anon" when
creating respective anonymous Decl names.
* std.testing: add `expectStringStartsWith`. Didn't end up using it
after all.
Also this enables the real test runner for stage2 LLVM backend (sans
wasm32) since it works now.
Instead of doing it before the switch tower, do it afterwards, so that
special handling may be done before undefined gets casted to the
destination type.
In this case the special handling we want to do is *[N]T to []T setting
the slice length based on the array length, even when the array value is
undefined.
Notably, Value.eql and Value.hash are improved to treat NaN as equal to
itself, so that Type/Value can be hash map keys. Likewise float hashing
normalizes the float value before computing the hash.
