8dc2499aa6
gotools/ * Makefile.am (go_cmd_cgo_files): Add ast_go118.go (check-go-tool): Copy golang.org/x/tools directories. * Makefile.in: Regenerate. Reviewed-on: https://go-review.googlesource.com/c/gofrontend/+/384695
95 lines
2.7 KiB
Go
95 lines
2.7 KiB
Go
// Copyright 2014 The Go Authors. All rights reserved.
|
|
// Use of this source code is governed by a BSD-style
|
|
// license that can be found in the LICENSE file.
|
|
|
|
package reflect
|
|
|
|
import (
|
|
"internal/goarch"
|
|
"unsafe"
|
|
)
|
|
|
|
// The makeFuncFFI function, written in C, fills in an FFI closure.
|
|
// It arranges for ffiCall to be invoked directly from FFI.
|
|
func makeFuncFFI(cif unsafe.Pointer, impl unsafe.Pointer)
|
|
|
|
// The makeCIF function, implemented in the runtime package, allocates a CIF.
|
|
func makeCIF(ft *funcType) unsafe.Pointer
|
|
|
|
// Export ffiCallbackGo so that C code in makefunc_ffi_c.c can call it.
|
|
//go:linkname ffiCallbackGo
|
|
|
|
// ffiCallbackGo implements the Go side of the libffi callback.
|
|
//
|
|
// The call chain arriving here looks like
|
|
// some_go_caller
|
|
// ->some_ffi_internals
|
|
// ->ffi_callback (in C)
|
|
// ->ffiCallbackGo
|
|
//
|
|
// The ffi_callback handles __go_makefunc_can_recover, and
|
|
// then passes off the data as received from ffi here.
|
|
func ffiCallbackGo(results unsafe.Pointer, params unsafe.Pointer, impl *makeFuncImpl, wordsize int32, bigEndian bool) {
|
|
ftyp := impl.typ
|
|
in := make([]Value, 0, len(ftyp.in))
|
|
ap := params
|
|
for _, rt := range ftyp.in {
|
|
p := unsafe_New(rt)
|
|
typedmemmove(rt, p, *(*unsafe.Pointer)(ap))
|
|
v := Value{rt, p, flag(rt.Kind()) | flagIndir}
|
|
in = append(in, v)
|
|
ap = (unsafe.Pointer)(uintptr(ap) + goarch.PtrSize)
|
|
}
|
|
|
|
out := impl.call(in)
|
|
|
|
checkValue := func(v Value, typ *rtype, addr unsafe.Pointer) {
|
|
if v.flag&flagRO != 0 {
|
|
panic("reflect: function created by MakeFunc using " + funcName(impl.fn) +
|
|
" returned value obtained from unexported field")
|
|
}
|
|
|
|
// Convert v to type typ if v is assignable to a variable
|
|
// of type t in the language spec.
|
|
// See issue 28761.
|
|
v = v.assignTo("reflect.MakeFunc", typ, addr)
|
|
}
|
|
|
|
// In libffi a single integer return value is always promoted
|
|
// to a full word. This only matters for integers whose size
|
|
// is less than the size of a full word. There is similar code
|
|
// in libgo/runtime/go-reflect-call.c.
|
|
if len(ftyp.out) == 1 {
|
|
typ := ftyp.out[0]
|
|
switch typ.Kind() {
|
|
case Bool, Int8, Int16, Int32, Uint8, Uint16, Uint32:
|
|
v := out[0]
|
|
checkValue(v, typ, nil)
|
|
|
|
if bigEndian {
|
|
results = unsafe.Pointer(uintptr(results) + uintptr(wordsize) - typ.size)
|
|
}
|
|
|
|
memmove(results, v.ptr, typ.size)
|
|
return
|
|
}
|
|
}
|
|
|
|
off := uintptr(0)
|
|
for i, typ := range ftyp.out {
|
|
v := out[i]
|
|
|
|
off = align(off, uintptr(typ.fieldAlign))
|
|
addr := unsafe.Pointer(uintptr(results) + off)
|
|
|
|
checkValue(v, typ, addr)
|
|
|
|
if v.flag&flagIndir == 0 && (v.kind() == Ptr || v.kind() == UnsafePointer) {
|
|
*(*unsafe.Pointer)(addr) = v.ptr
|
|
} else {
|
|
typedmemmove(typ, addr, v.ptr)
|
|
}
|
|
off += typ.size
|
|
}
|
|
}
|