This CL adds shiftIsBounded checks for the Lsh* and Rsh* rules in arm64.
There is no need to check the shift value again with CMP + CSEL when the
shift value is valid.
Change-Id: I54620de64f02a1b5a11089add237248ae2de01b4
Reviewed-on: https://go-review.googlesource.com/c/go/+/417714
Reviewed-by: Keith Randall <khr@golang.org>
Reviewed-by: Keith Randall <khr@google.com>
Reviewed-by: Heschi Kreinick <heschi@google.com>
Apparently, some testing environments do not allow root to mount tmpfs
(due to e.g. AppArmor profile disallowing mount(2) syscall).
Always skip the test if the mount has failed.
Fixes the test issue introduced by CL 414824.
Change-Id: Ic565d2e6f277f2926d85a351be7df2498ffba656
Reviewed-on: https://go-review.googlesource.com/c/go/+/429175
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When naming case variables, the unified frontend was using
typecheck.Lookup, which uses the current package, rather than
localIdent, which uses the package the variable was originally
declared in. When inlining across package boundaries, this could cause
the case variables to be associated with the wrong package.
In practice, I don't believe this has any negative consequences, but
it's inconsistent and triggered an ICE in typecheck.ClosureType, which
expected all captured variables to be declared in the same package.
Easy fix is to ensure case variables are declared in the correct
package by using localIdent.
Fixes#54912.
Change-Id: I7a429c708ad95723f46a67872cb0cf0c53a6a0d6
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The unified frontend ICEs when inlining a function that contains a
function literal, which captures both a type switch case variable and
another variable.
Updates #54912.
Change-Id: I0e16d371ed5df48a70823beb0bf12110a5a17266
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The toStringData test was meant to test reflect.StringHeader, not
reflect.SliceHeader. It's not supported to convert *string to
*reflect.SliceHeader anyway.
Change-Id: Iaa4912eafd241886c6337bd7607cdf2412a15ead
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The lowests fives bits are the kind, and the next five bits are attributes,
not the other way around.
Change-Id: I5e1d13b195b766e99f66bb1227cc7f84e85dc49d
Reviewed-on: https://go-review.googlesource.com/c/go/+/425185
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Auto-Submit: Keith Randall <khr@golang.org>
To match _func.nameOff.
Change-Id: I75e71cadaa0f7ca8844d1b49950673797b227074
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Change-Id: I583e167dac033037e82e55a9ae6c6f0c47a34c7f
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Switch to the more Go-style name to match inlinedCall.nameOff.
Change-Id: I2115b27af8309e1ead7d61ecc65fe4fc966030f7
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The meaning of this field is unchanged, this CL simply gives it a more
descriptive name, as func_ makes it sound like a reference to the _func.
Change-Id: I70e54f34bede7636ce4d7b9dd0f7557308f02143
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If test would fail, the error message will have wrong error and its
type, because e is used after the failed type assertion.
To fix, use the original err.
While at it,
- combine the checks for error type and value into one statement;
- use the standard "got ..., want ..." format.
Fixes: 212d2f82e0 ("os: add ErrClosed, return for use of closed File")
Change-Id: I862a96607b461ab89cce6bed2443b28aa2c16468
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It was fixed by CL 422196, and have been already worked in unified IR.
Fixes#54911
Change-Id: Ie69044a64b296f6961e667e7661d8c4d1a24d84e
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Change-Id: Ie100a2a6f272b84fa2da6ac7b64452985242d788
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Change-Id: I2ed993a804dd830b9ff445c467eb224b7aaa3401
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This reverts commit CL 427140.
Reason for revert: Comments say that done should be the first field.
Change-Id: Id131da064146b44e1182289546aeb877867e63cc
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Change-Id: I610509aa35c345ff7fbb1fc94bf177ffbe934731
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Change-Id: I0d1195fcb4eceb12c4be3190b05a82079dc496a3
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Change-Id: I88b55f61eccb5764cac2a9397fd99a62f8735a9a
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In particular, (SEQZ (SNEZ x)) can arise from (Not (IsNonNil x)).
Change-Id: Ie249cd1934d71087e0f774cf8f6c937ceeed7ad5
Reviewed-on: https://go-review.googlesource.com/c/go/+/428215
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LoweredAtomicLoad8 is implemented using MOVBU, hence it is already zero
extended. LoweredAtomicCas32 and LoweredAtomicCas64 return a properly
typed boolean.
Change-Id: Ie0acbaa19403d59c7e5f76d060cc13ee51eb7834
Reviewed-on: https://go-review.googlesource.com/c/go/+/428214
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Implement Slicemask the same way every other architecture does - negate
then arithmetic right shift. This sets or clears the sign bit, before
extending it to the entire register.
Removes around 2,500 instructions from the Go binary on linux/riscv64.
Change-Id: I4d675b826e7eb23fe2b1e6e46b95dcd49ab49733
Reviewed-on: https://go-review.googlesource.com/c/go/+/426354
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Updates #54854
Change-Id: Ibaf4eea14a6259cdbca79e9e95db1602966f18e6
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Updates #54854
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Updates #54854
Change-Id: I9c14f9fa595f73eae44eb714abc5d486915893c1
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Change-Id: I840262eefff1073a452a243b9e31f61b53362fcf
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Having an executable bit set for a binary is not enough for it to be
executable -- there might be more checks in the kernel. For example,
binaries on a filesystem mounted with "noexec" flag couldn't be
executed. There might be other scenarios involving ACLs, SELinux,
file capabilities, and so on.
As a result, LookPath might either find a non-executable (while going
over $PATH elements), or return a false positive that the argument
provided is an executable.
One possible fix would be to perform the check by using access(2)
syscall with X_OK flag.
Now, since access(2) uses real (rather than effective) uid and gid,
when used by a setuid or setgid binary, it checks permissions of the
(real) user who started the binary, rather than the actual effective
permissions. Therefore, using access with X_OK won't work as expected
for setuid/setgid binaries.
To fix this, modern platforms added ways to check against effective uid
and gid, with the most common being the faccessat(2) call with the
AT_EACCESS flag, as described by POSIX.1-2008 (in Linux, only
faccessat2(2) supports flags such as AT_EACCESS). Let's use it, and fall
back to checking permission bits if faccessat is not available.
Wrap the logic into unix.Eaccess, which is currently only implemented on
Linux. While many other OSes (Free/Net/OpenBSD, AIX, Solaris/Illumos, and
Darwin) do implement faccessat(2) with AT_EACCESS, it is not wired in
syscall package (except for AIX), so these platforms are left out for now.
In the future, eaccess can be implemented for these OSes, too.
Alas, a call to unix.Eaccess is not enough since we have to filter out
directories, so use both stat and Eaccess.
One minor change introduced by this commit is that LookPath and Command
now returns "is a directory" error when the argument contains a slash
and is a directory. This is similar to what e.g. bash does on Linux:
$ bash -c /etc
bash: line 1: /etc: Is a directory
Add a test case, which, unfortunately, requires root, is specific to
Linux, and needs a relatively new kernel (supporting faccessat2). Other
platforms either have different semantics for tmpfs with noexec, or have
different ways to set up a binary which has x bit set but nevertheless
could not be executed.
Change-Id: If49b6ef6bf4dd23b2c32bebec8832d83e511a4bb
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Change-Id: I754edcf21e003a3f4037fb2c5d8d06f2cd5f2fa3
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Change-Id: I3861a73d6b9d1d454c42bec50099b916bf30f1cd
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The parent, file, and line fields are no longer used now that we have
parentPc to find the parent and NOPs in the parent to attach file/line
pcdata to.
Removing these fields reduces the binary size of cmd/go on linux-amd64
by 1.1%.
Fixes#54849.
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For defer/go calls, the function/method value are evaluated immediately.
So after devirtualizing, it may trigger a panic when implicitly deref
a nil pointer receiver, causing the program behaves unexpectedly.
It's safer to not devirtualizing defer/go calls at all.
Fixes#52072
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