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go/misc/cgo
Cherry Zhang 98f8454a73 cmd/link: don't decode type symbol in shared library in deadcode
In the linker's deadcode pass we decode type symbols for
interface satisfaction analysis. When linking against Go shared
libraries, the type symbol may come from a shared library, so it
doesn't have data in the current module being linked, so we cannot
decode it. We already have code to skip DYNIMPORT symbols. However,
this doesn't actually work, because at that point the type symbols'
names haven't been mangled, whereas they may be mangled in the
shared library. So the symbol definition (in shared library) and
reference (in current module) haven't been connected.

Skip decoding type symbols of type Sxxx (along with DYNIMPORT)
when linkShared.

Note: we cannot skip all type symbols, as we still need to mark
unexported methods defined in the current module.

Fixes #44031.

Change-Id: I833d19a060c94edbd6fc448172358f9a7d760657
Reviewed-on: https://go-review.googlesource.com/c/go/+/288496
Trust: Cherry Zhang <cherryyz@google.com>
Trust: Than McIntosh <thanm@google.com>
Run-TryBot: Cherry Zhang <cherryyz@google.com>
TryBot-Result: Go Bot <gobot@golang.org>
Reviewed-by: Than McIntosh <thanm@google.com>
2021-02-02 16:00:58 +00:00
..
errors cmd/go, cmd/cgo: don't let bogus symbol set cgo_ldflag 2020-11-12 20:58:06 +00:00
fortran
gmp
life
nocgo
stdio
test misc/cgo/test: enable TestCrossPackageTests on darwin/arm64 2020-12-30 22:39:48 +00:00
testasan
testcarchive misc/cgo/testcarchive: remove special flags for Darwin/ARM 2020-12-30 22:39:59 +00:00
testcshared cmd/link: avoid exporting all symbols on windows buildmode=pie 2020-11-02 00:46:44 +00:00
testgodefs cmd/cgo: don't translate bitfields into Go fields 2020-09-16 03:02:13 +00:00
testplugin cmd/compile: mark plugin-exported types as used in interface 2020-11-13 22:01:37 +00:00
testsanitizers cmd/compile, runtime: use __msan_memmove for moving data, split msanread to fields 2020-12-03 15:40:11 +00:00
testshared cmd/link: don't decode type symbol in shared library in deadcode 2021-02-02 16:00:58 +00:00
testsigfwd
testso all: add GOOS=ios 2020-09-23 18:12:59 +00:00
testsovar all: add GOOS=ios 2020-09-23 18:12:59 +00:00
testtls