diagnostics: make paths to external items more visible
This PR changes the reported path for an external item so that it is visible from at least one local module (i.e. it does not use any inaccessible external modules) if possible. If the external item's crate was declared with an `extern crate`, the path is guarenteed to use the `extern crate`.
Fixes#23224, fixes#23355, fixes#26635, fixes#27165.
r? @nrc
Also adds a new set of passes to run just before translation that
"prepare" the MIR for codegen. Removal of landing pads, region erasure
and break critical edges are run in this pass.
Also fixes some merge/rebase errors.
Book: Fix phrasing: “an associated type” → “an object with an associated type”.
From what I understood, `graph` is the object from which we create a trait object, and the associated types are `Graph::N` and `Graph::E`.
Remove no longer necessary coercions to fn pointer types.
Originally added in 8fe9e4dff6.
Everything appears to build fine without the coercions, so they can
presumably be removed.
Gate parser recovery via debugflag
Gate parser recovery via debugflag
Put in `-Z continue_parse_after_error`
This works by adding a method, `fn abort_if_no_parse_recovery`, to the
diagnostic handler in `syntax::errors`, and calling it after each
error is emitted in the parser.
(We might consider adding a debugflag to do such aborts in other
places where we are currently attempting recovery, such as resolve,
but I think the parser is the really important case to handle in the
face of #31994 and the parser bugs of varying degrees that were
injected by parse error recovery.)
r? @nikomatsakis
parser recovery (so that expected errors match up)
I'm opting into parser recovery in all these cases out of expediency,
not because the error messages you get with recovery enabled are
actually all that usable in all cases listed.
This works by adding a boolean flag, `continue_after_error`, to
`syntax::errors::Handler` that can be imperatively set to `true` or
`false` via a new `fn set_continue_after_error`.
The flag starts off true (since we generally try to recover from
compiler errors, and `Handler` is shared across all phases).
Then, during the `phase_1_parse_input`, we consult the setting of the
`-Z continue-parse-after-error` debug flag to determine whether we
should leave the flag set to `true` or should change it to `false`.
----
(We might consider adding a debugflag to do such aborts in other
places where we are currently attempting recovery, such as resolve,
but I think the parser is the really important case to handle in the
face of #31994 and the parser bugs of varying degrees that were
injected by parse error recovery.)
Fix panic_fmt in the Book
While implementing panic_fmt for the GameCube I noticed that the parameters given to it were completely broken. Turns out that panic_fmt requires the C ABI to work correctly. This should be fixed in the documentation, so that others don't make the same mistake. Thanks to mbrubeck in the IRC for helping me figure this out.
Not specifying extern for lang_items correctly should potentially also be a compiler error.
This commit should help configure our OSX rustbuild builder for targeting 10.7.
A key part of this is using `libc++` instead of `libstdc++` as apparently it's
more filled out and otherwise LLVM's cmake configuration would fail.
mk: A few build fixes for i586-pc-windows-msvc
Detect the triple in the configure script for probing MSVC shenanigans and also
be sure to use `llvm-config` from the build host and not the target when
configuring compiler-rt.
mk: Fix cross-host builds
The change in b20e748 had the unintended consequence of breaking cross-host
builds as we apparently relied on the incorrect definition of this variable in
the makefiles. That change, however, was required to get tests passing so we
couldn't just revert it.
This commit fixes the underlying bug by leaving the "more correct" definition of
`LD_LIBRARY_PATH_ENV_TARGETDIR` (also fixing it with a hardcoded reference to
`CFG_BUILD`) and updating the `RPATH_VAR` definition below. Turned out we
already had special-casing logic for passing `--cfg stage1` during the
well-we-print-this-as-stage0 build of a cross-host. That logic was just updated
to pull from a different variable as opposed to relying on the definition of
that variable to accommodate this.
Closes#32568
Some blocks won't be translated at all because they aren't reachable at
the LLVM level, these need to be dealt with because they lack a
terminator and therefore trigger an LLVM assertion.
Other blocks aren't reachable because of codegen-time optimistions, for
example not dropping types that don't need it, often resulting in blocks
with no predecessors. We'll clean those up as well.
This is a fairly standard transform that inserts blocks along critical
edges so code can be inserted along the edge without it affecting other
edges. The main difference is that it considers a Drop or Call
terminator that would require an `invoke` instruction in LLVM a critical
edge. This is because we can't actually insert code after an invoke, so
it ends up looking similar to a critical edge anyway.
The transform is run just before translation right now.
