1 // Copyright 2011 The Go Authors. All rights reserved. 2 // Use of this source code is governed by a BSD-style 3 // license that can be found in the LICENSE file. 4 5 package cgo 6 7 import "unsafe" 8 9 // These utility functions are available to be called from code 10 // compiled with gcc via crosscall2. 11 12 // cgocallback is defined in runtime 13 //go:linkname _runtime_cgocallback runtime.cgocallback 14 func _runtime_cgocallback(unsafe.Pointer, unsafe.Pointer, uintptr) 15 16 // The declaration of crosscall2 is: 17 // void crosscall2(void (*fn)(void *, int), void *, int); 18 // 19 // We need to export the symbol crosscall2 in order to support 20 // callbacks from shared libraries. This applies regardless of 21 // linking mode. 22 //go:cgo_export_static crosscall2 23 //go:cgo_export_dynamic crosscall2 24 25 // Panic. The argument is converted into a Go string. 26 27 // Call like this in code compiled with gcc: 28 // struct { const char *p; } a; 29 // a.p = /* string to pass to panic */; 30 // crosscall2(_cgo_panic, &a, sizeof a); 31 // /* The function call will not return. */ 32 33 //go:linkname _runtime_cgo_panic_internal runtime._cgo_panic_internal 34 var _runtime_cgo_panic_internal byte 35 36 //go:linkname _cgo_panic _cgo_panic 37 //go:cgo_export_static _cgo_panic 38 //go:cgo_export_dynamic _cgo_panic 39 //go:nosplit 40 //go:norace 41 func _cgo_panic(a unsafe.Pointer, n int32) { 42 _runtime_cgocallback(unsafe.Pointer(&_runtime_cgo_panic_internal), a, uintptr(n)) 43 } 44 45 //go:cgo_import_static x_cgo_init 46 //go:linkname x_cgo_init x_cgo_init 47 //go:linkname _cgo_init _cgo_init 48 var x_cgo_init byte 49 var _cgo_init = &x_cgo_init 50 51 //go:cgo_import_static x_cgo_malloc 52 //go:linkname x_cgo_malloc x_cgo_malloc 53 //go:linkname _cgo_malloc _cgo_malloc 54 var x_cgo_malloc byte 55 var _cgo_malloc = &x_cgo_malloc 56 57 //go:cgo_import_static x_cgo_free 58 //go:linkname x_cgo_free x_cgo_free 59 //go:linkname _cgo_free _cgo_free 60 var x_cgo_free byte 61 var _cgo_free = &x_cgo_free 62 63 //go:cgo_import_static x_cgo_thread_start 64 //go:linkname x_cgo_thread_start x_cgo_thread_start 65 //go:linkname _cgo_thread_start _cgo_thread_start 66 var x_cgo_thread_start byte 67 var _cgo_thread_start = &x_cgo_thread_start 68 69 // Creates a new system thread without updating any Go state. 70 // 71 // This method is invoked during shared library loading to create a new OS 72 // thread to perform the runtime initialization. This method is similar to 73 // _cgo_sys_thread_start except that it doesn't update any Go state. 74 75 //go:cgo_import_static x_cgo_sys_thread_create 76 //go:linkname x_cgo_sys_thread_create x_cgo_sys_thread_create 77 //go:linkname _cgo_sys_thread_create _cgo_sys_thread_create 78 var x_cgo_sys_thread_create byte 79 var _cgo_sys_thread_create = &x_cgo_sys_thread_create 80 81 // Notifies that the runtime has been intialized. 82 // 83 // We currently block at every CGO entry point (via _cgo_wait_runtime_init_done) 84 // to ensure that the runtime has been initialized before the CGO call is 85 // executed. This is necessary for shared libraries where we kickoff runtime 86 // initialization in a separate thread and return without waiting for this 87 // thread to complete the init. 88 89 //go:cgo_import_static x_cgo_notify_runtime_init_done 90 //go:linkname x_cgo_notify_runtime_init_done x_cgo_notify_runtime_init_done 91 //go:linkname _cgo_notify_runtime_init_done _cgo_notify_runtime_init_done 92 var x_cgo_notify_runtime_init_done byte 93 var _cgo_notify_runtime_init_done = &x_cgo_notify_runtime_init_done 94 95 //go:cgo_export_static _cgo_topofstack 96 //go:cgo_export_dynamic _cgo_topofstack 97
