gcc/libgo/go/runtime/cgocallback.go
Ian Lance Taylor f8d9fa9e80 libgo, compiler: Upgrade libgo to Go 1.4, except for runtime.
This upgrades all of libgo other than the runtime package to
the Go 1.4 release.  In Go 1.4 much of the runtime was
rewritten into Go.  Merging that code will take more time and
will not change the API, so I'm putting it off for now.

There are a few runtime changes anyhow, to accomodate other
packages that rely on minor modifications to the runtime
support.

The compiler changes slightly to add a one-bit flag to each
type descriptor kind that is stored directly in an interface,
which for gccgo is currently only pointer types.  Another
one-bit flag (gcprog) is reserved because it is used by the gc
compiler, but gccgo does not currently use it.

There is another error check in the compiler since I ran
across it during testing.

gotools/:
	* Makefile.am (go_cmd_go_files): Sort entries.  Add generate.go.
	* Makefile.in: Rebuild.

From-SVN: r219627
2015-01-15 00:27:56 +00:00

41 lines
1.2 KiB
Go

// Copyright 2011 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 runtime
import "unsafe"
// These functions are called from C code via cgo/callbacks.c.
// Allocate memory. This allocates the requested number of bytes in
// memory controlled by the Go runtime. The allocated memory will be
// zeroed. You are responsible for ensuring that the Go garbage
// collector can see a pointer to the allocated memory for as long as
// it is valid, e.g., by storing a pointer in a local variable in your
// C function, or in memory allocated by the Go runtime. If the only
// pointers are in a C global variable or in memory allocated via
// malloc, then the Go garbage collector may collect the memory.
//
// TODO(rsc,iant): This memory is untyped.
// Either we need to add types or we need to stop using it.
func _cgo_allocate_internal(len uintptr) unsafe.Pointer {
if len == 0 {
len = 1
}
ret := unsafe.Pointer(&make([]unsafe.Pointer, (len+ptrSize-1)/ptrSize)[0])
c := new(cgomal)
c.alloc = ret
gp := getg()
c.next = gp.m.cgomal
gp.m.cgomal = c
return ret
}
// Panic.
func _cgo_panic_internal(p *byte) {
panic(gostringnocopy(p))
}