mirror of
https://github.com/tinygo-org/tinygo.git
synced 2026-08-07 20:43:40 +00:00
Ayke van Laethem
b7a3fd8d2f
Here is the proposal: https://github.com/golang/go/issues/56378 They are documented here: https://pkg.go.dev/cmd/cgo@master#hdr-Optimizing_calls_of_C_code This would have been very useful to fix https://github.com/tinygo-org/bluetooth/issues/176 in a nice way. That bug is now fixed in a different way using a wrapper function, but once this new noescape pragma gets included in TinyGo we could remove the workaround and use `#cgo noescape` instead.
85 lines
1.7 KiB
Go
85 lines
1.7 KiB
Go
package main
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import "syscall"
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import "unsafe"
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var _ unsafe.Pointer
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//go:linkname C.CString runtime.cgo_CString
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func C.CString(string) *C.char
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//go:linkname C.GoString runtime.cgo_GoString
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func C.GoString(*C.char) string
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//go:linkname C.__GoStringN runtime.cgo_GoStringN
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func C.__GoStringN(*C.char, uintptr) string
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func C.GoStringN(cstr *C.char, length C.int) string {
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return C.__GoStringN(cstr, uintptr(length))
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}
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//go:linkname C.__GoBytes runtime.cgo_GoBytes
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func C.__GoBytes(unsafe.Pointer, uintptr) []byte
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func C.GoBytes(ptr unsafe.Pointer, length C.int) []byte {
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return C.__GoBytes(ptr, uintptr(length))
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}
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//go:linkname C.__CBytes runtime.cgo_CBytes
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func C.__CBytes([]byte) unsafe.Pointer
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func C.CBytes(b []byte) unsafe.Pointer {
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return C.__CBytes(b)
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}
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//go:linkname C.__get_errno_num runtime.cgo_errno
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func C.__get_errno_num() uintptr
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func C.__get_errno() error {
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return syscall.Errno(C.__get_errno_num())
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}
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type (
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C.char uint8
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C.schar int8
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C.uchar uint8
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C.short int16
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C.ushort uint16
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C.int int32
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C.uint uint32
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C.long int32
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C.ulong uint32
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C.longlong int64
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C.ulonglong uint64
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)
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//export foo
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func C.foo(a C.int, b C.int) C.int
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var C.foo$funcaddr unsafe.Pointer
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//export variadic0
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//go:variadic
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func C.variadic0()
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var C.variadic0$funcaddr unsafe.Pointer
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//export variadic2
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//go:variadic
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func C.variadic2(x C.int, y C.int)
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var C.variadic2$funcaddr unsafe.Pointer
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//export _Cgo_static_173c95a79b6df1980521_staticfunc
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func C.staticfunc!symbols.go(x C.int)
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var C.staticfunc!symbols.go$funcaddr unsafe.Pointer
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//export notEscapingFunction
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//go:noescape
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func C.notEscapingFunction(a *C.int)
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var C.notEscapingFunction$funcaddr unsafe.Pointer
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//go:extern someValue
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var C.someValue C.int
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