* Sema: avoid unnecessary safety checks when an error set is empty.
* Sema: make zirErrorToInt handle comptime errors that are represented
as integers.
* Sema: make empty error sets properly integrate with
typeHasOnePossibleValue.
* Type: correct the ABI alignment and size of error unions which have
both zero-bit error set and zero-bit payload. The previous code did
not account for the fact that we still need to store a bit for
whether there is an error.
* LLVM: lower error unions possibly with the payload first or with the
error code first, depending on alignment. Previously it always put
the error code first and used a padding array.
* LLVM: lower functions which have an empty error set as the return
type the same as anyerror, so that they can be used where
fn()anyerror function pointers are expected. In such functions, Zig
will lower ret to returning zero instead of void.
As a result, one more behavior test is passing.
Rename all references of sparcv9 to sparc64, to make Zig align more with
other projects. Also, added new function to convert glibc arch name to Zig
arch name, since it refers to the architecture as sparcv9.
This is based on the suggestion by @kubkon in PR 11847.
(https://github.com/ziglang/zig/pull/11487#pullrequestreview-963761757)
Adding `unreachable` prevents the futex code from being inspected during
a single-threaded build. Without futex, first draft BYOS packages don't
need to implement `nanosleep` to get a single-threaded "hello world"
program working.
Use of `assert()` did not achieve the desired effect of avoiding futex
in a single-threaded build.
With this change, it is now possible to safely call
`var di = std.debug.openSelfDebugInfo(gpa)`. Calling then
`di.deinit()` on the object will correctly free all allocated
resources.
Ensure we store the result of `mmap` with correct alignment.
With this change, it is now possible to safely call
`var di = std.debug.openSelfDebugInfo(gpa)`. Calling then
`di.deinit()` on the object will correctly free all allocated
resources.
While this code probably could do with some love and a redesign,
this commit fixes the allocations by making sure we explicitly
pass an allocator where required, and we use arenas for temporary
or narrowly-scoped objects such as a `Die` (for `Die` in particular,
not every `FormValue` will be allocated - we could duplicate, or
we can use an arena which is the proposal of this commit).
When the last instruction is a debug instruction, the type of it is void.
Similarly for 'noreturn' emit an 'unreachable' instruction to tell the wasm-validator
the path cannot be reached.
Also respect the '--strip' flag in the self-hosted wasm linker and not emit a 'name' section
when the flag is set to `true`.
This fixes lack of stack traces on arm64 macOS which were regressed
and not getting generated at all after this addition to write
current stack traces. Prior to this, function `isValidMemory` would
sync two subsequent pages if the aligned (base) address was different
than the frame pointer. I fail to see what the logic for such assumption
here is as the manual of `msync` clearly states it will fail with error
if the passed in memory region length contains unmapped regions.
This was the very reason why there were no stack traces print on
arm64 macOS as the second page was unmapped thus incorrectly flagging
the frame pointer as invalid.
DWARF 5 moves around some fields and adds a few new ones that can't be
parsed or ignored by our current DWARF 4 parser. This isn't a complete
implementation of DWARF 5, but this is enough to make stack traces
mostly work. Line numbers from C++ don't show up, but I know the info
is there. I think the answer is to iterate through .debug_line_str in
getLineNumberInfo, but I didn't want to fall into an even deeper rabbit
hole tonight.
This commit fixes two related things:
1. If the loop goes all the way through the slice without a match, on
the last iteration `mid == symbols.len - 1` which causes
`&symbols[mid + 1]` to be out of bounds. End one step before that
instead.
2. If the address we're looking for is greater than the address of the
last symbol in the slice, we now match it to that symbol. Previously,
we would miss this case since we only matched if the address was _in
between_ the address of two symbols.
I don't think we can guarantee that especially for system dyld
dylibs which can be loaded at any address (perhaps even some
OS preferential low memory address).
Incidentally, this fixes stack trace tests on x86_64 macOS 12.
In order to be linker-independent, when parsing debug info in each
linked OSO, we also create a quick lookup table for symbols defined
within the OSO. We then use this lookup to map symbol from the EXE
to its defined address within the original OSO which we can then
use to extract its associated DWARF info (if any).
This is a breaking change. Before, usage looked like this:
```zig
const held = mutex.acquire();
defer held.release();
```
Now it looks like this:
```zig
mutex.lock();
defer mutex.unlock();
```
The `Held` type was an idea to make mutexes slightly safer by making it
more difficult to forget to release an aquired lock. However, this
ultimately caused more problems than it solved, when any data structures
needed to store a held mutex. Simplify everything by reducing the API
down to the primitives: lock() and unlock().
Closes#8051Closes#8246Closes#10105
The main purpose of this branch is to explore avoiding the
`usingnamespace` feature of the zig language, specifically with regards
to `std.os` and related functionality.
If this experiment is successful, it will provide a data point on
whether or not it would be practical to entirely remove `usingnamespace`
from the language.
In this commit, `usingnamespace` has been completely eliminated from
the Linux x86_64 compilation path, aside from io_uring.
The behavior tests pass, however that's as far as this branch goes. It is
very breaking, and a lot more work is needed before it could be
considered mergeable. I wanted to put a pull requset up early so that
zig programmers have time to provide feedback.
This is progress towards closing #6600 since it clarifies where the
actual "owner" of each declaration is, and reduces the number of
different ways to import the same declarations.
One of the main organizational strategies used here is to do namespacing
with real namespaces (e.g. structs) rather than by having declarations
share a common prefix (the C strategy). It's no coincidence that
`usingnamespace` has similar semantics to `#include` and becomes much
less necessary when using proper namespaces.
We already have a LICENSE file that covers the Zig Standard Library. We
no longer need to remind everyone that the license is MIT in every single
file.
Previously this was introduced to clarify the situation for a fork of
Zig that made Zig's LICENSE file harder to find, and replaced it with
their own license that required annual payments to their company.
However that fork now appears to be dead. So there is no need to
reinforce the copyright notice in every single file.
On arm64 macOS, the address of the last frame is 0x0 rather than
a positive value like 0x1 on x86_64 macOS, therefore, we overflow
an integer trying to subtract 1 when printing the stack trace. This
patch fixes it by first checking for this condition before trying
to subtract 1.
Note that we do not need to signal the `SignalIterator` about this
as it will correctly detect this condition on the subsequent iteration
and return `null`, thus terminating the loop.
No functional changes are expected, this patch is only moving some code
in order to slim the huge bowl of spaghetti that is debug.zig.
The amount of memory leaked on error is much less than before but not
zero, some further work is required to smooth the edges of this old part
of the stdlib.
