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Source file src/runtime/cgo.go

     1	// Copyright 2014 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 runtime
     6	
     7	import "unsafe"
     8	
     9	//go:cgo_export_static main
    10	
    11	// Filled in by runtime/cgo when linked into binary.
    12	
    13	//go:linkname _cgo_init _cgo_init
    14	//go:linkname _cgo_thread_start _cgo_thread_start
    15	//go:linkname _cgo_sys_thread_create _cgo_sys_thread_create
    16	//go:linkname _cgo_notify_runtime_init_done _cgo_notify_runtime_init_done
    17	//go:linkname _cgo_callers _cgo_callers
    18	//go:linkname _cgo_set_context_function _cgo_set_context_function
    19	
    20	var (
    21		_cgo_init                     unsafe.Pointer
    22		_cgo_thread_start             unsafe.Pointer
    23		_cgo_sys_thread_create        unsafe.Pointer
    24		_cgo_notify_runtime_init_done unsafe.Pointer
    25		_cgo_callers                  unsafe.Pointer
    26		_cgo_set_context_function     unsafe.Pointer
    27	)
    28	
    29	// iscgo is set to true by the runtime/cgo package
    30	var iscgo bool
    31	
    32	// cgoHasExtraM is set on startup when an extra M is created for cgo.
    33	// The extra M must be created before any C/C++ code calls cgocallback.
    34	var cgoHasExtraM bool
    35	
    36	// cgoUse is called by cgo-generated code (using go:linkname to get at
    37	// an unexported name). The calls serve two purposes:
    38	// 1) they are opaque to escape analysis, so the argument is considered to
    39	// escape to the heap.
    40	// 2) they keep the argument alive until the call site; the call is emitted after
    41	// the end of the (presumed) use of the argument by C.
    42	// cgoUse should not actually be called (see cgoAlwaysFalse).
    43	func cgoUse(interface{}) { throw("cgoUse should not be called") }
    44	
    45	// cgoAlwaysFalse is a boolean value that is always false.
    46	// The cgo-generated code says if cgoAlwaysFalse { cgoUse(p) }.
    47	// The compiler cannot see that cgoAlwaysFalse is always false,
    48	// so it emits the test and keeps the call, giving the desired
    49	// escape analysis result. The test is cheaper than the call.
    50	var cgoAlwaysFalse bool
    51	

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