Calling with a new stack, with a runtime-known stack pointer (e.g.
not a global variable) is regressed with this branch. It is now a
compile-error, due to the Runtime Hint system not being smart enough
to mix a compile-time modifier field with a runtime stack field.
I'm OK with this regression because this feature is flawed (see #3268)
and may be deleted from the language.
The new plan to support hobby operating systems is #3784.
And what kind of name is "Zen" anyway? There's already a
[Zen programming language](http://zenlang.sourceforge.net/)
and that's just confusing.
Total bytes used in stage1 std lib tests:
3.418 -> 3.198 GiB (saving 225 MiB)
There's still this from pass 1 not getting freed:
Const: 6909049 items, 72 bytes each, total 474.407 MiB
This is due to 2 things hanging on to references to IrAnalyze pointers:
* ZigVar->owner_exec->analysis
* LazyValue->ira
The LazyValue one could be solved by memoizing the results after the
lazy value is resolved, and then it could unref the IrAnalyze.
ZigVars that are determined to be comptime const, could have their
const_value set to that value, instead of using the mem_slot_index
mechanism. This would prevent an IrAnalyze ref in some cases.
Having ConstGlobalRefs be a pointer in ZigValue was a hack that caused
plenty of bugs. It was used to work around difficulties in type coercing
array values into slices.
However, after #3787 is merged, array values no longer type coerce into
slices, and so this provided an opportunity to clean up the code.
This has the nice effect of reducing stage1 peak RAM usage during the
std lib tests from 3.443 GiB to 3.405 GiB (saving 39 MiB).
There is one behavior test failing in this branch, which I plan to debug
after merging #3787.
* Implements #3768. This is a sweeping breaking change that requires
many (trivial) edits to Zig source code. Array values no longer
coerced to slices; however one may use `&` to obtain a reference to
an array value, which may then be coerced to a slice.
* Adds `IrInstruction::dump`, for debugging purposes. It's useful to
call to inspect the instruction when debugging Zig IR.
* Fixes bugs with result location semantics. See the new behavior test
cases, and compile error test cases.
* Fixes bugs with `@typeInfo` not properly resolving const values.
* Behavior tests are passing but std lib tests are not yet. There
is more work to do before merging this branch.
Andrew Kelley