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The Go programming language
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The problem is that the cdecl() function in cmd/cgo/godefs.go isn't properly translating the Go array type to a C array type when an asterisk follows the [] in the array type declaration (it is perfectly legal to put the asterisk on either side of the [] in go syntax, depending on how you set up your pointers). That said, the cdefs tool is only designed to translate from Go types generated using the cgo *godefs* tool -- where the godefs tool is designed to translate gcc-style C types into Go types. In essence, the cdefs tool translates from gcc-style C types to Go types (via the godefs tool), then back to kenc-style C types. Because of this, cdefs does not need to know how to translate arbitraty Go types into C, just the ones produced by godefs. The problem is that during this translation process, the logic is slightly wrong when going from (e.g.): char *array[10]; to: array [10]*int8; back to: int8 *array[10]; In the current implementation of cdecl(), the translation from the Go type declaration back to the kenc-style declaration looks for Go types of the form: name *[]type; rather than the actual generated Go type declaration of: name []*type; Both are valid Go syntax, with slightly different semantics, but the latter is the only one that can ever be generated by the godefs tools. (The semantics of the former are not directly expressible in a single C statement -- you would have to have to first typedef the array type, then declare a pointer to that typedef'd type in a separate statement). This commit changes the logic of cdecl() to look properly for, and translate, Go type declarations of the form: name []*type; Additionally, the original implementation only allowed for a single asterisk and a single sized aray (i.e. only a single level of pointer indirection, and only one set of []) on the type, whereas the patched version allows for an arbitrary number of both. Tests are included in misc/cgo/testcdefs and the all.bash script has been updated to account for these. R=golang-dev, bradfitz, dave, iant CC=golang-dev https://golang.org/cl/11377043 |
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This is the source code repository for the Go programming language.
For documentation about how to install and use Go,
visit http://golang.org/ or load doc/install.html in your web browser.
After installing Go, you can view a nicely formatted
doc/install.html by running godoc --http=:6060
and then visiting http://localhost:6060/doc/install.html.
Unless otherwise noted, the Go source files are distributed
under the BSD-style license found in the LICENSE file.
--
Binary Distribution Notes
If you have just untarred a binary Go distribution, you need to set
the environment variable $GOROOT to the full path of the go
directory (the one containing this README). You can omit the
variable if you unpack it into /usr/local/go, or if you rebuild
from sources by running all.bash (see doc/install.html).
You should also add the Go binary directory $GOROOT/bin
to your shell's path.
For example, if you extracted the tar file into $HOME/go, you might
put the following in your .profile:
export GOROOT=$HOME/go
export PATH=$PATH:$GOROOT/bin
See doc/install.html for more details.