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 //go:build !cgo && (darwin || freebsd || linux || netbsd)
6 7 package fakecgo
8 9 import (
10 _ "unsafe"
11 )
12 13 // TODO: decide if we need _runtime_cgo_panic_internal
14 15 //go:linkname x_cgo_init_trampoline x_cgo_init_trampoline
16 //go:linkname _cgo_init _cgo_init
17 var x_cgo_init_trampoline byte
18 var _cgo_init = &x_cgo_init_trampoline
19 20 // Creates a new system thread without updating any Go state.
21 //
22 // This method is invoked during shared library loading to create a new OS
23 // thread to perform the runtime initialization. This method is similar to
24 // _cgo_sys_thread_start except that it doesn't update any Go state.
25 26 //go:linkname x_cgo_thread_start_trampoline x_cgo_thread_start_trampoline
27 //go:linkname _cgo_thread_start _cgo_thread_start
28 var x_cgo_thread_start_trampoline byte
29 var _cgo_thread_start = &x_cgo_thread_start_trampoline
30 31 // Notifies that the runtime has been initialized.
32 //
33 // We currently block at every CGO entry point (via _cgo_wait_runtime_init_done)
34 // to ensure that the runtime has been initialized before the CGO call is
35 // executed. This is necessary for shared libraries where we kickoff runtime
36 // initialization in a separate thread and return without waiting for this
37 // thread to complete the init.
38 39 //go:linkname x_cgo_notify_runtime_init_done_trampoline x_cgo_notify_runtime_init_done_trampoline
40 //go:linkname _cgo_notify_runtime_init_done _cgo_notify_runtime_init_done
41 var x_cgo_notify_runtime_init_done_trampoline byte
42 var _cgo_notify_runtime_init_done = &x_cgo_notify_runtime_init_done_trampoline
43 44 // Indicates whether a dummy thread key has been created or not.
45 //
46 // When calling go exported function from C, we register a destructor
47 // callback, for a dummy thread key, by using pthread_key_create.
48 49 //go:linkname _cgo_pthread_key_created _cgo_pthread_key_created
50 var x_cgo_pthread_key_created uintptr
51 var _cgo_pthread_key_created = &x_cgo_pthread_key_created
52 53 // Set the x_crosscall2_ptr C function pointer variable point to crosscall2.
54 // It's for the runtime package to call at init time.
55 func set_crosscall2() {
56 // nothing needs to be done here for fakecgo
57 // because it's possible to just call cgocallback directly
58 }
59 60 //go:linkname _set_crosscall2 runtime.set_crosscall2
61 var _set_crosscall2 = set_crosscall2
62 63 // Store the g into the thread-specific value.
64 // So that pthread_key_destructor will dropm when the thread is exiting.
65 66 //go:linkname x_cgo_bindm_trampoline x_cgo_bindm_trampoline
67 //go:linkname _cgo_bindm _cgo_bindm
68 var x_cgo_bindm_trampoline byte
69 var _cgo_bindm = &x_cgo_bindm_trampoline
70 71 // TODO: decide if we need x_cgo_set_context_function
72 // TODO: decide if we need _cgo_yield
73 74 var (
75 // In Go 1.20 the race detector was rewritten to pure Go
76 // on darwin. This means that when CGO_ENABLED=0 is set
77 // fakecgo is built with race detector code. This is not
78 // good since this code is pretending to be C. The go:norace
79 // pragma is not enough, since it only applies to the native
80 // ABIInternal function. The ABIO wrapper (which is necessary,
81 // since all references to text symbols from assembly will use it)
82 // does not inherit the go:norace pragma, so it will still be
83 // instrumented by the race detector.
84 //
85 // To circumvent this issue, using closure calls in the
86 // assembly, which forces the compiler to use the ABIInternal
87 // native implementation (which has go:norace) instead.
88 threadentry_call = threadentry
89 x_cgo_init_call = x_cgo_init
90 x_cgo_setenv_call = x_cgo_setenv
91 x_cgo_unsetenv_call = x_cgo_unsetenv
92 x_cgo_thread_start_call = x_cgo_thread_start
93 )
94