Now the branch is compiling again, provided that one uses
`-Dskip-non-native`, but many code paths are disabled. The code paths
can now be re-enabled one at a time and updated to conform to the new
AIR memory layout.
to the link infrastructure, instead of being stored with Module.Fn. This
moves towards a strategy to make more efficient use of memory by not
storing Air or Liveness data in the Fn struct, but computing it on
demand, immediately sending it to the backend, and then immediately
freeing it.
Backends which want to defer codegen until flush() such as SPIR-V
must move the Air/Liveness data upon `updateFunc` being called and keep
track of that data in the backend implementation itself.
Previously, this field was used because the Zir.Inst.Ref encoding
supported the concept of references to function parameters. However now
thanks to whole-file-astgen, the implementations of indexToRef and
refToIndex are trivial addition/subtraction of a comptime const integer.
It's pretty compact, with each AIR instruction only taking up 4 bits,
plus a sparse table for special instructions such as conditional branch,
switch branch, and function calls with more than 2 arguments.
This commit changes the AIR file and the documentation of the memory
layout. The actual work of modifying the surrounding code (in Sema and
codegen) is not yet done.
c_void is *not* simply `const c_void = opaque{};`. It has unique
semantics as any pointer type may coerce to `*c_void` which is not true
for an arbitrary `*opaque{}`.
Use `@` syntax to escape `_` when used as an identifier.
Remove the stage1 astgen prohibition against assigning from `_`
Note: there a few stage1 bugs preventing `_` from being used as an identifier
for a local variable or function parameter; these will be fixed by stage2.
They are unlikely to arise in real C code since identifiers starting with
underscore are reserved for the implementation.
Amends b009aca38a861f74fd5378db19c65db286ad397e.
The PR predated the introduction of unused variable/constant checks,
thus the build checks weren't reporting this failure until later when
merged into master.
* remove unused download page html. It's now handled in the
www.ziglang.org website repo.
* add netbsd to the downloads index.json file that we send to
the www.ziglang.org website repo.
* shallow clone the website repo to avoid downloading old copies of
data.js unnecessarily.
Implement io_uring submission queue entry preparation methods for
epoll_ctl, poll_add and poll_remove.
Poll masks are designated as 32-bit little-endian integers as
specified in liburing's definitions.
Updated io_uring_prep_rw to take in an unsigned 64-bit address instead
of an anytype. io_uring_sqe by default assumes that the address
specified in a submission queue entry is an unsigned 64-bit integer.
For stage1 ZIR instructions and stage1 AIR instructions, the instruction
op code was taking up 8 bytes due to padding even though it only needed
1 byte. This commit reduces the ref_count field from uint32_t to
uint16_t because the code only really cares if instructions are
referenced at all, not how many times they are referenced. With the
ref_count field reduced to uint16_t the uint8_t op code is now placed in
the freed up space.
Empirically, this saves 382 MiB of peak RAM usage when building the
self-hosted compiler, which is a reduction of 5%. Consequently this
resulted in a 3% reduction of cache-misses when building the self-hosted
compiler.
This was @SpexGuy's idea, committed by me because we tested it on my
computer.
