准备 ch2-5 例子

.gitignore

@@ -19,8 +19,6 @@ _book
 *.obj
 *.exe
 
-_obj
-
 # macOS
 .DS_Store
 

ch2-cgo/ch2-05-internal.md

@@ -14,8 +14,12 @@
 
 ## Go调用C函数
 
+![](../images/ch2-call-c-sum-v1.uml.png)
+
 TODO
 
 ## C调用Go函数
 
+![](../images/ch2-call-c-sum-v2.uml.png)
+
 TODO

ch2-cgo/ch2-06-qsort.md

@@ -1 +1,3 @@
 # 2.6. 实战: 封装qsort
+
+![](../images/ch2-qsort-v2.uml.png)

examples/ch2-05-internal/01-cgo-gen-files/_obj/_cgo_export.c

@@ -0,0 +1,13 @@
+/* Created by cgo - DO NOT EDIT. */
+#include <stdlib.h>
+#include "_cgo_export.h"
+
+extern void crosscall2(void (*fn)(void *, int, __SIZE_TYPE__), void *, int, __SIZE_TYPE__);
+extern __SIZE_TYPE__ _cgo_wait_runtime_init_done();
+extern void _cgo_release_context(__SIZE_TYPE__);
+
+extern char* _cgo_topofstack(void);
+#define CGO_NO_SANITIZE_THREAD
+#define _cgo_tsan_acquire()
+#define _cgo_tsan_release()
+

examples/ch2-05-internal/01-cgo-gen-files/_obj/_cgo_export.h

@@ -0,0 +1,69 @@
+/* Created by "go tool cgo" - DO NOT EDIT. */
+
+/* package main */
+
+
+#line 1 "cgo-builtin-prolog"
+
+#include <stddef.h> /* for ptrdiff_t below */
+
+#ifndef GO_CGO_EXPORT_PROLOGUE_H
+#define GO_CGO_EXPORT_PROLOGUE_H
+
+typedef struct { const char *p; ptrdiff_t n; } _GoString_;
+
+#endif
+
+/* Start of preamble from import "C" comments.  */
+
+
+
+/* End of preamble from import "C" comments.  */
+
+
+/* Start of boilerplate cgo prologue.  */
+#line 1 "cgo-gcc-export-header-prolog"
+
+#ifndef GO_CGO_PROLOGUE_H
+#define GO_CGO_PROLOGUE_H
+
+typedef signed char GoInt8;
+typedef unsigned char GoUint8;
+typedef short GoInt16;
+typedef unsigned short GoUint16;
+typedef int GoInt32;
+typedef unsigned int GoUint32;
+typedef long long GoInt64;
+typedef unsigned long long GoUint64;
+typedef GoInt64 GoInt;
+typedef GoUint64 GoUint;
+typedef __SIZE_TYPE__ GoUintptr;
+typedef float GoFloat32;
+typedef double GoFloat64;
+typedef float _Complex GoComplex64;
+typedef double _Complex GoComplex128;
+
+/*
+  static assertion to make sure the file is being used on architecture
+  at least with matching size of GoInt.
+*/
+typedef char _check_for_64_bit_pointer_matching_GoInt[sizeof(void*)==64/8 ? 1:-1];
+
+typedef _GoString_ GoString;
+typedef void *GoMap;
+typedef void *GoChan;
+typedef struct { void *t; void *v; } GoInterface;
+typedef struct { void *data; GoInt len; GoInt cap; } GoSlice;
+
+#endif
+
+/* End of boilerplate cgo prologue.  */
+
+#ifdef __cplusplus
+extern "C" {
+#endif
+
+
+#ifdef __cplusplus
+}
+#endif

examples/ch2-05-internal/01-cgo-gen-files/_obj/_cgo_flags

@@ -0,0 +1 @@
+_CGO_CFLAGS=

examples/ch2-05-internal/01-cgo-gen-files/_obj/_cgo_gotypes.go

@@ -0,0 +1,31 @@
+// Created by cgo - DO NOT EDIT
+
+package main
+
+import "unsafe"
+
+import _ "runtime/cgo"
+
+import "syscall"
+
+var _ syscall.Errno
+func _Cgo_ptr(ptr unsafe.Pointer) unsafe.Pointer { return ptr }
+
+//go:linkname _Cgo_always_false runtime.cgoAlwaysFalse
+var _Cgo_always_false bool
+//go:linkname _Cgo_use runtime.cgoUse
+func _Cgo_use(interface{})
+type _Ctype_void [0]byte
+
+//go:linkname _cgo_runtime_cgocall runtime.cgocall
+func _cgo_runtime_cgocall(unsafe.Pointer, uintptr) int32
+
+//go:linkname _cgo_runtime_cgocallback runtime.cgocallback
+func _cgo_runtime_cgocallback(unsafe.Pointer, unsafe.Pointer, uintptr, uintptr)
+
+//go:linkname _cgoCheckPointer runtime.cgoCheckPointer
+func _cgoCheckPointer(interface{}, ...interface{})
+
+//go:linkname _cgoCheckResult runtime.cgoCheckResult
+func _cgoCheckResult(interface{})
+

examples/ch2-05-internal/01-cgo-gen-files/_obj/_cgo_main.c

@@ -0,0 +1,9 @@
+int main() { return 0; }
+void crosscall2(void(*fn)(void*, int, __SIZE_TYPE__), void *a, int c, __SIZE_TYPE__ ctxt) { }
+__SIZE_TYPE__ _cgo_wait_runtime_init_done() { return 0; }
+void _cgo_release_context(__SIZE_TYPE__ ctxt) { }
+char* _cgo_topofstack(void) { return (char*)0; }
+void _cgo_allocate(void *a, int c) { }
+void _cgo_panic(void *a, int c) { }
+void _cgo_reginit(void) { }
+#line 1 "cgo-generated-wrappers"

examples/ch2-05-internal/01-cgo-gen-files/_obj/hello.cgo1.go

@@ -0,0 +1,9 @@
+// Created by cgo - DO NOT EDIT
+
+//line hello.go:1
+// Copyright © 2017 ChaiShushan <chaishushan{AT}gmail.com>.
+// License: https://creativecommons.org/licenses/by-nc-sa/4.0/
+
+package main
+
+import _ "unsafe"

examples/ch2-05-internal/01-cgo-gen-files/_obj/hello.cgo2.c

@@ -0,0 +1,53 @@
+
+#line 1 "cgo-builtin-prolog"
+#include <stddef.h> /* for ptrdiff_t and size_t below */
+
+/* Define intgo when compiling with GCC.  */
+typedef ptrdiff_t intgo;
+
+typedef struct { const char *p; intgo n; } _GoString_;
+typedef struct { char *p; intgo n; intgo c; } _GoBytes_;
+_GoString_ GoString(char *p);
+_GoString_ GoStringN(char *p, int l);
+_GoBytes_ GoBytes(void *p, int n);
+char *CString(_GoString_);
+void *CBytes(_GoBytes_);
+void *_CMalloc(size_t);
+
+__attribute__ ((unused))
+static size_t _GoStringLen(_GoString_ s) { return s.n; }
+
+__attribute__ ((unused))
+static const char *_GoStringPtr(_GoString_ s) { return s.p; }
+
+
+
+#line 1 "cgo-gcc-prolog"
+/*
+  If x and y are not equal, the type will be invalid
+  (have a negative array count) and an inscrutable error will come
+  out of the compiler and hopefully mention "name".
+*/
+#define __cgo_compile_assert_eq(x, y, name) typedef char name[(x-y)*(x-y)*-2+1];
+
+/* Check at compile time that the sizes we use match our expectations. */
+#define __cgo_size_assert(t, n) __cgo_compile_assert_eq(sizeof(t), n, _cgo_sizeof_##t##_is_not_##n)
+
+__cgo_size_assert(char, 1)
+__cgo_size_assert(short, 2)
+__cgo_size_assert(int, 4)
+typedef long long __cgo_long_long;
+__cgo_size_assert(__cgo_long_long, 8)
+__cgo_size_assert(float, 4)
+__cgo_size_assert(double, 8)
+
+extern char* _cgo_topofstack(void);
+
+#include <errno.h>
+#include <string.h>
+
+
+#define CGO_NO_SANITIZE_THREAD
+#define _cgo_tsan_acquire()
+#define _cgo_tsan_release()
+

examples/ch2-05-internal/01-cgo-gen-files/_obj/main.cgo1.go

@@ -0,0 +1,11 @@
+// Created by cgo - DO NOT EDIT
+
+//line main.go:1
+// Copyright © 2017 ChaiShushan <chaishushan{AT}gmail.com>.
+// License: https://creativecommons.org/licenses/by-nc-sa/4.0/
+
+package main
+
+import _ "unsafe"
+
+func main() {}

examples/ch2-05-internal/01-cgo-gen-files/_obj/main.cgo2.c

@@ -0,0 +1,53 @@
+
+#line 1 "cgo-builtin-prolog"
+#include <stddef.h> /* for ptrdiff_t and size_t below */
+
+/* Define intgo when compiling with GCC.  */
+typedef ptrdiff_t intgo;
+
+typedef struct { const char *p; intgo n; } _GoString_;
+typedef struct { char *p; intgo n; intgo c; } _GoBytes_;
+_GoString_ GoString(char *p);
+_GoString_ GoStringN(char *p, int l);
+_GoBytes_ GoBytes(void *p, int n);
+char *CString(_GoString_);
+void *CBytes(_GoBytes_);
+void *_CMalloc(size_t);
+
+__attribute__ ((unused))
+static size_t _GoStringLen(_GoString_ s) { return s.n; }
+
+__attribute__ ((unused))
+static const char *_GoStringPtr(_GoString_ s) { return s.p; }
+
+
+
+#line 1 "cgo-gcc-prolog"
+/*
+  If x and y are not equal, the type will be invalid
+  (have a negative array count) and an inscrutable error will come
+  out of the compiler and hopefully mention "name".
+*/
+#define __cgo_compile_assert_eq(x, y, name) typedef char name[(x-y)*(x-y)*-2+1];
+
+/* Check at compile time that the sizes we use match our expectations. */
+#define __cgo_size_assert(t, n) __cgo_compile_assert_eq(sizeof(t), n, _cgo_sizeof_##t##_is_not_##n)
+
+__cgo_size_assert(char, 1)
+__cgo_size_assert(short, 2)
+__cgo_size_assert(int, 4)
+typedef long long __cgo_long_long;
+__cgo_size_assert(__cgo_long_long, 8)
+__cgo_size_assert(float, 4)
+__cgo_size_assert(double, 8)
+
+extern char* _cgo_topofstack(void);
+
+#include <errno.h>
+#include <string.h>
+
+
+#define CGO_NO_SANITIZE_THREAD
+#define _cgo_tsan_acquire()
+#define _cgo_tsan_release()
+

examples/ch2-05-internal/02-go-call-c-func/Makefile

@@ -0,0 +1,9 @@
+# Copyright © 2017 ChaiShushan <chaishushan{AT}gmail.com>.
+# License: https://creativecommons.org/licenses/by-nc-sa/4.0/
+
+default: clean
+	go tool cgo main.go
+	go run main.go
+
+clean:
+	-rm -rf ./_obj

examples/ch2-05-internal/02-go-call-c-func/_obj/_cgo_export.c

@@ -0,0 +1,13 @@
+/* Created by cgo - DO NOT EDIT. */
+#include <stdlib.h>
+#include "_cgo_export.h"
+
+extern void crosscall2(void (*fn)(void *, int, __SIZE_TYPE__), void *, int, __SIZE_TYPE__);
+extern __SIZE_TYPE__ _cgo_wait_runtime_init_done();
+extern void _cgo_release_context(__SIZE_TYPE__);
+
+extern char* _cgo_topofstack(void);
+#define CGO_NO_SANITIZE_THREAD
+#define _cgo_tsan_acquire()
+#define _cgo_tsan_release()
+

examples/ch2-05-internal/02-go-call-c-func/_obj/_cgo_export.h

@@ -0,0 +1,69 @@
+/* Created by "go tool cgo" - DO NOT EDIT. */
+
+/* package main */
+
+
+#line 1 "cgo-builtin-prolog"
+
+#include <stddef.h> /* for ptrdiff_t below */
+
+#ifndef GO_CGO_EXPORT_PROLOGUE_H
+#define GO_CGO_EXPORT_PROLOGUE_H
+
+typedef struct { const char *p; ptrdiff_t n; } _GoString_;
+
+#endif
+
+/* Start of preamble from import "C" comments.  */
+
+
+
+/* End of preamble from import "C" comments.  */
+
+
+/* Start of boilerplate cgo prologue.  */
+#line 1 "cgo-gcc-export-header-prolog"
+
+#ifndef GO_CGO_PROLOGUE_H
+#define GO_CGO_PROLOGUE_H
+
+typedef signed char GoInt8;
+typedef unsigned char GoUint8;
+typedef short GoInt16;
+typedef unsigned short GoUint16;
+typedef int GoInt32;
+typedef unsigned int GoUint32;
+typedef long long GoInt64;
+typedef unsigned long long GoUint64;
+typedef GoInt64 GoInt;
+typedef GoUint64 GoUint;
+typedef __SIZE_TYPE__ GoUintptr;
+typedef float GoFloat32;
+typedef double GoFloat64;
+typedef float _Complex GoComplex64;
+typedef double _Complex GoComplex128;
+
+/*
+  static assertion to make sure the file is being used on architecture
+  at least with matching size of GoInt.
+*/
+typedef char _check_for_64_bit_pointer_matching_GoInt[sizeof(void*)==64/8 ? 1:-1];
+
+typedef _GoString_ GoString;
+typedef void *GoMap;
+typedef void *GoChan;
+typedef struct { void *t; void *v; } GoInterface;
+typedef struct { void *data; GoInt len; GoInt cap; } GoSlice;
+
+#endif
+
+/* End of boilerplate cgo prologue.  */
+
+#ifdef __cplusplus
+extern "C" {
+#endif
+
+
+#ifdef __cplusplus
+}
+#endif

examples/ch2-05-internal/02-go-call-c-func/_obj/_cgo_flags

@@ -0,0 +1 @@
+_CGO_CFLAGS=

examples/ch2-05-internal/02-go-call-c-func/_obj/_cgo_gotypes.go

@@ -0,0 +1,47 @@
+// Created by cgo - DO NOT EDIT
+
+package main
+
+import "unsafe"
+
+import _ "runtime/cgo"
+
+import "syscall"
+
+var _ syscall.Errno
+func _Cgo_ptr(ptr unsafe.Pointer) unsafe.Pointer { return ptr }
+
+//go:linkname _Cgo_always_false runtime.cgoAlwaysFalse
+var _Cgo_always_false bool
+//go:linkname _Cgo_use runtime.cgoUse
+func _Cgo_use(interface{})
+type _Ctype_int int32
+
+type _Ctype_void [0]byte
+
+//go:linkname _cgo_runtime_cgocall runtime.cgocall
+func _cgo_runtime_cgocall(unsafe.Pointer, uintptr) int32
+
+//go:linkname _cgo_runtime_cgocallback runtime.cgocallback
+func _cgo_runtime_cgocallback(unsafe.Pointer, unsafe.Pointer, uintptr, uintptr)
+
+//go:linkname _cgoCheckPointer runtime.cgoCheckPointer
+func _cgoCheckPointer(interface{}, ...interface{})
+
+//go:linkname _cgoCheckResult runtime.cgoCheckResult
+func _cgoCheckResult(interface{})
+
+//go:cgo_import_static _cgo_506f45f9fa85_Cfunc_sum
+//go:linkname __cgofn__cgo_506f45f9fa85_Cfunc_sum _cgo_506f45f9fa85_Cfunc_sum
+var __cgofn__cgo_506f45f9fa85_Cfunc_sum byte
+var _cgo_506f45f9fa85_Cfunc_sum = unsafe.Pointer(&__cgofn__cgo_506f45f9fa85_Cfunc_sum)
+
+//go:cgo_unsafe_args
+func _Cfunc_sum(p0 _Ctype_int, p1 _Ctype_int) (r1 _Ctype_int) {
+	_cgo_runtime_cgocall(_cgo_506f45f9fa85_Cfunc_sum, uintptr(unsafe.Pointer(&p0)))
+	if _Cgo_always_false {
+		_Cgo_use(p0)
+		_Cgo_use(p1)
+	}
+	return
+}

examples/ch2-05-internal/02-go-call-c-func/_obj/_cgo_main.c

@@ -0,0 +1,9 @@
+int main() { return 0; }
+void crosscall2(void(*fn)(void*, int, __SIZE_TYPE__), void *a, int c, __SIZE_TYPE__ ctxt) { }
+__SIZE_TYPE__ _cgo_wait_runtime_init_done() { return 0; }
+void _cgo_release_context(__SIZE_TYPE__ ctxt) { }
+char* _cgo_topofstack(void) { return (char*)0; }
+void _cgo_allocate(void *a, int c) { }
+void _cgo_panic(void *a, int c) { }
+void _cgo_reginit(void) { }
+#line 1 "cgo-generated-wrappers"

examples/ch2-05-internal/02-go-call-c-func/_obj/main.cgo1.go

@@ -0,0 +1,14 @@
+// Created by cgo - DO NOT EDIT
+
+//line main.go:1
+// Copyright © 2017 ChaiShushan <chaishushan{AT}gmail.com>.
+// License: https://creativecommons.org/licenses/by-nc-sa/4.0/
+
+package main
+
+//int sum(int a, int b) { return a+b; }
+import _ "unsafe"
+
+func main() {
+	println((_Cfunc_sum)(1, 1))
+}

examples/ch2-05-internal/02-go-call-c-func/_obj/main.cgo2.c

@@ -0,0 +1,76 @@
+
+#line 1 "cgo-builtin-prolog"
+#include <stddef.h> /* for ptrdiff_t and size_t below */
+
+/* Define intgo when compiling with GCC.  */
+typedef ptrdiff_t intgo;
+
+typedef struct { const char *p; intgo n; } _GoString_;
+typedef struct { char *p; intgo n; intgo c; } _GoBytes_;
+_GoString_ GoString(char *p);
+_GoString_ GoStringN(char *p, int l);
+_GoBytes_ GoBytes(void *p, int n);
+char *CString(_GoString_);
+void *CBytes(_GoBytes_);
+void *_CMalloc(size_t);
+
+__attribute__ ((unused))
+static size_t _GoStringLen(_GoString_ s) { return s.n; }
+
+__attribute__ ((unused))
+static const char *_GoStringPtr(_GoString_ s) { return s.p; }
+
+#line 6 "/Users/chai/go/src/github.com/chai2010/advanced-go-programming-book/examples/ch2-05-internal/02-go-call-c-func/main.go"
+int sum(int a, int b) { return a+b; }
+
+#line 1 "cgo-generated-wrapper"
+
+
+#line 1 "cgo-gcc-prolog"
+/*
+  If x and y are not equal, the type will be invalid
+  (have a negative array count) and an inscrutable error will come
+  out of the compiler and hopefully mention "name".
+*/
+#define __cgo_compile_assert_eq(x, y, name) typedef char name[(x-y)*(x-y)*-2+1];
+
+/* Check at compile time that the sizes we use match our expectations. */
+#define __cgo_size_assert(t, n) __cgo_compile_assert_eq(sizeof(t), n, _cgo_sizeof_##t##_is_not_##n)
+
+__cgo_size_assert(char, 1)
+__cgo_size_assert(short, 2)
+__cgo_size_assert(int, 4)
+typedef long long __cgo_long_long;
+__cgo_size_assert(__cgo_long_long, 8)
+__cgo_size_assert(float, 4)
+__cgo_size_assert(double, 8)
+
+extern char* _cgo_topofstack(void);
+
+#include <errno.h>
+#include <string.h>
+
+
+#define CGO_NO_SANITIZE_THREAD
+#define _cgo_tsan_acquire()
+#define _cgo_tsan_release()
+
+CGO_NO_SANITIZE_THREAD
+void
+_cgo_506f45f9fa85_Cfunc_sum(void *v)
+{
+	struct {
+		int p0;
+		int p1;
+		int r;
+		char __pad12[4];
+	} __attribute__((__packed__)) *a = v;
+	char *stktop = _cgo_topofstack();
+	__typeof__(a->r) r;
+	_cgo_tsan_acquire();
+	r = sum(a->p0, a->p1);
+	_cgo_tsan_release();
+	a = (void*)((char*)a + (_cgo_topofstack() - stktop));
+	a->r = r;
+}
+

examples/ch2-05-internal/02-go-call-c-func/main.go

@@ -0,0 +1,11 @@
+// Copyright © 2017 ChaiShushan <chaishushan{AT}gmail.com>.
+// License: https://creativecommons.org/licenses/by-nc-sa/4.0/
+
+package main
+
+//int sum(int a, int b) { return a+b; }
+import "C"
+
+func main() {
+	println(C.sum(1, 1))
+}

examples/ch2-05-internal/03-c-call-go-func/Makefile

@@ -0,0 +1,14 @@
+# Copyright © 2017 ChaiShushan <chaishushan{AT}gmail.com>.
+# License: https://creativecommons.org/licenses/by-nc-sa/4.0/
+
+default:
+	go tool cgo sum.go
+	go build -buildmode=c-archive -o sum.a sum.go
+	gcc -o a.out main.c sum.a
+	./a.out
+
+clean:
+	-rm -rf ./_obj
+	-rm sum.a sum.h
+	-rm a.out
+

examples/ch2-05-internal/03-c-call-go-func/_obj/_cgo_export.c

@@ -0,0 +1,33 @@
+/* Created by cgo - DO NOT EDIT. */
+#include <stdlib.h>
+#include "_cgo_export.h"
+
+extern void crosscall2(void (*fn)(void *, int, __SIZE_TYPE__), void *, int, __SIZE_TYPE__);
+extern __SIZE_TYPE__ _cgo_wait_runtime_init_done();
+extern void _cgo_release_context(__SIZE_TYPE__);
+
+extern char* _cgo_topofstack(void);
+#define CGO_NO_SANITIZE_THREAD
+#define _cgo_tsan_acquire()
+#define _cgo_tsan_release()
+
+extern void _cgoexp_8313eaf44386_sum(void *, int, __SIZE_TYPE__);
+
+CGO_NO_SANITIZE_THREAD
+int sum(int p0, int p1)
+{
+	__SIZE_TYPE__ _cgo_ctxt = _cgo_wait_runtime_init_done();
+	struct {
+		int p0;
+		int p1;
+		int r0;
+		char __pad0[4];
+	} __attribute__((__packed__)) a;
+	a.p0 = p0;
+	a.p1 = p1;
+	_cgo_tsan_release();
+	crosscall2(_cgoexp_8313eaf44386_sum, &a, 16, _cgo_ctxt);
+	_cgo_tsan_acquire();
+	_cgo_release_context(_cgo_ctxt);
+	return a.r0;
+}

examples/ch2-05-internal/03-c-call-go-func/_obj/_cgo_export.h

@@ -0,0 +1,76 @@
+/* Created by "go tool cgo" - DO NOT EDIT. */
+
+/* package main */
+
+
+#line 1 "cgo-builtin-prolog"
+
+#include <stddef.h> /* for ptrdiff_t below */
+
+#ifndef GO_CGO_EXPORT_PROLOGUE_H
+#define GO_CGO_EXPORT_PROLOGUE_H
+
+typedef struct { const char *p; ptrdiff_t n; } _GoString_;
+
+#endif
+
+/* Start of preamble from import "C" comments.  */
+
+
+#line 6 "/Users/chai/go/src/github.com/chai2010/advanced-go-programming-book/examples/ch2-05-internal/03-c-call-go-func/sum.go"
+int sum(int a, int b);
+
+#line 1 "cgo-generated-wrapper"
+
+
+/* End of preamble from import "C" comments.  */
+
+
+/* Start of boilerplate cgo prologue.  */
+#line 1 "cgo-gcc-export-header-prolog"
+
+#ifndef GO_CGO_PROLOGUE_H
+#define GO_CGO_PROLOGUE_H
+
+typedef signed char GoInt8;
+typedef unsigned char GoUint8;
+typedef short GoInt16;
+typedef unsigned short GoUint16;
+typedef int GoInt32;
+typedef unsigned int GoUint32;
+typedef long long GoInt64;
+typedef unsigned long long GoUint64;
+typedef GoInt64 GoInt;
+typedef GoUint64 GoUint;
+typedef __SIZE_TYPE__ GoUintptr;
+typedef float GoFloat32;
+typedef double GoFloat64;
+typedef float _Complex GoComplex64;
+typedef double _Complex GoComplex128;
+
+/*
+  static assertion to make sure the file is being used on architecture
+  at least with matching size of GoInt.
+*/
+typedef char _check_for_64_bit_pointer_matching_GoInt[sizeof(void*)==64/8 ? 1:-1];
+
+typedef _GoString_ GoString;
+typedef void *GoMap;
+typedef void *GoChan;
+typedef struct { void *t; void *v; } GoInterface;
+typedef struct { void *data; GoInt len; GoInt cap; } GoSlice;
+
+#endif
+
+/* End of boilerplate cgo prologue.  */
+
+#ifdef __cplusplus
+extern "C" {
+#endif
+
+
+extern int sum(int p0, int p1);
+
+#ifdef __cplusplus
+}
+#endif

examples/ch2-05-internal/03-c-call-go-func/_obj/_cgo_flags

@@ -0,0 +1 @@
+_CGO_CFLAGS=

examples/ch2-05-internal/03-c-call-go-func/_obj/_cgo_gotypes.go

@@ -0,0 +1,46 @@
+// Created by cgo - DO NOT EDIT
+
+package main
+
+import "unsafe"
+
+import _ "runtime/cgo"
+
+import "syscall"
+
+var _ syscall.Errno
+func _Cgo_ptr(ptr unsafe.Pointer) unsafe.Pointer { return ptr }
+
+//go:linkname _Cgo_always_false runtime.cgoAlwaysFalse
+var _Cgo_always_false bool
+//go:linkname _Cgo_use runtime.cgoUse
+func _Cgo_use(interface{})
+type _Ctype_int int32
+
+type _Ctype_void [0]byte
+
+//go:linkname _cgo_runtime_cgocall runtime.cgocall
+func _cgo_runtime_cgocall(unsafe.Pointer, uintptr) int32
+
+//go:linkname _cgo_runtime_cgocallback runtime.cgocallback
+func _cgo_runtime_cgocallback(unsafe.Pointer, unsafe.Pointer, uintptr, uintptr)
+
+//go:linkname _cgoCheckPointer runtime.cgoCheckPointer
+func _cgoCheckPointer(interface{}, ...interface{})
+
+//go:linkname _cgoCheckResult runtime.cgoCheckResult
+func _cgoCheckResult(interface{})
+
+//go:cgo_export_dynamic sum
+//go:linkname _cgoexp_8313eaf44386_sum _cgoexp_8313eaf44386_sum
+//go:cgo_export_static _cgoexp_8313eaf44386_sum
+//go:nosplit
+//go:norace
+func _cgoexp_8313eaf44386_sum(a unsafe.Pointer, n int32, ctxt uintptr) {
+	fn := _cgoexpwrap_8313eaf44386_sum
+	_cgo_runtime_cgocallback(**(**unsafe.Pointer)(unsafe.Pointer(&fn)), a, uintptr(n), ctxt);
+}
+
+func _cgoexpwrap_8313eaf44386_sum(p0 _Ctype_int, p1 _Ctype_int) (r0 _Ctype_int) {
+	return sum(p0, p1)
+}

examples/ch2-05-internal/03-c-call-go-func/_obj/_cgo_main.c

@@ -0,0 +1,10 @@
+int main() { return 0; }
+void crosscall2(void(*fn)(void*, int, __SIZE_TYPE__), void *a, int c, __SIZE_TYPE__ ctxt) { }
+__SIZE_TYPE__ _cgo_wait_runtime_init_done() { return 0; }
+void _cgo_release_context(__SIZE_TYPE__ ctxt) { }
+char* _cgo_topofstack(void) { return (char*)0; }
+void _cgo_allocate(void *a, int c) { }
+void _cgo_panic(void *a, int c) { }
+void _cgo_reginit(void) { }
+#line 1 "cgo-generated-wrappers"
+int _cgoexp_8313eaf44386_sum;

examples/ch2-05-internal/03-c-call-go-func/_obj/sum.cgo1.go

@@ -0,0 +1,17 @@
+// Created by cgo - DO NOT EDIT
+
+//line sum.go:1
+// Copyright © 2017 ChaiShushan <chaishushan{AT}gmail.com>.
+// License: https://creativecommons.org/licenses/by-nc-sa/4.0/
+
+package main
+
+//int sum(int a, int b);
+import _ "unsafe"
+
+//export sum
+func sum(a, b _Ctype_int) _Ctype_int {
+	return a + b
+}
+
+func main() {}

examples/ch2-05-internal/03-c-call-go-func/_obj/sum.cgo2.c

@@ -0,0 +1,57 @@
+
+#line 1 "cgo-builtin-prolog"
+#include <stddef.h> /* for ptrdiff_t and size_t below */
+
+/* Define intgo when compiling with GCC.  */
+typedef ptrdiff_t intgo;
+
+typedef struct { const char *p; intgo n; } _GoString_;
+typedef struct { char *p; intgo n; intgo c; } _GoBytes_;
+_GoString_ GoString(char *p);
+_GoString_ GoStringN(char *p, int l);
+_GoBytes_ GoBytes(void *p, int n);
+char *CString(_GoString_);
+void *CBytes(_GoBytes_);
+void *_CMalloc(size_t);
+
+__attribute__ ((unused))
+static size_t _GoStringLen(_GoString_ s) { return s.n; }
+
+__attribute__ ((unused))
+static const char *_GoStringPtr(_GoString_ s) { return s.p; }
+
+#line 6 "/Users/chai/go/src/github.com/chai2010/advanced-go-programming-book/examples/ch2-05-internal/03-c-call-go-func/sum.go"
+int sum(int a, int b);
+
+#line 1 "cgo-generated-wrapper"
+
+
+#line 1 "cgo-gcc-prolog"
+/*
+  If x and y are not equal, the type will be invalid
+  (have a negative array count) and an inscrutable error will come
+  out of the compiler and hopefully mention "name".
+*/
+#define __cgo_compile_assert_eq(x, y, name) typedef char name[(x-y)*(x-y)*-2+1];
+
+/* Check at compile time that the sizes we use match our expectations. */
+#define __cgo_size_assert(t, n) __cgo_compile_assert_eq(sizeof(t), n, _cgo_sizeof_##t##_is_not_##n)
+
+__cgo_size_assert(char, 1)
+__cgo_size_assert(short, 2)
+__cgo_size_assert(int, 4)
+typedef long long __cgo_long_long;
+__cgo_size_assert(__cgo_long_long, 8)
+__cgo_size_assert(float, 4)
+__cgo_size_assert(double, 8)
+
+extern char* _cgo_topofstack(void);
+
+#include <errno.h>
+#include <string.h>
+
+
+#define CGO_NO_SANITIZE_THREAD
+#define _cgo_tsan_acquire()
+#define _cgo_tsan_release()
+

examples/ch2-05-internal/03-c-call-go-func/main.c

@@ -0,0 +1,10 @@
+// Copyright © 2017 ChaiShushan <chaishushan{AT}gmail.com>.
+// License: https://creativecommons.org/licenses/by-nc-sa/4.0/
+
+#include <stdio.h>
+
+int main() {
+	extern int sum(int a, int b);
+	printf("1+1=%d\n", sum(1, 1));
+	return 0;
+}

examples/ch2-05-internal/03-c-call-go-func/sum.go

@@ -0,0 +1,14 @@
+// Copyright © 2017 ChaiShushan <chaishushan{AT}gmail.com>.
+// License: https://creativecommons.org/licenses/by-nc-sa/4.0/
+
+package main
+
+//int sum(int a, int b);
+import "C"
+
+//export sum
+func sum(a, b C.int) C.int {
+	return a + b
+}
+
+func main() {}

examples/ch2-05-internal/03-c-call-go-func/sum.h

@@ -0,0 +1,76 @@
+/* Created by "go tool cgo" - DO NOT EDIT. */
+
+/* package command-line-arguments */
+
+
+#line 1 "cgo-builtin-prolog"
+
+#include <stddef.h> /* for ptrdiff_t below */
+
+#ifndef GO_CGO_EXPORT_PROLOGUE_H
+#define GO_CGO_EXPORT_PROLOGUE_H
+
+typedef struct { const char *p; ptrdiff_t n; } _GoString_;
+
+#endif
+
+/* Start of preamble from import "C" comments.  */
+
+
+#line 6 "/Users/chai/go/src/github.com/chai2010/advanced-go-programming-book/examples/ch2-05-internal/03-c-call-go-func/sum.go"
+int sum(int a, int b);
+
+#line 1 "cgo-generated-wrapper"
+
+
+/* End of preamble from import "C" comments.  */
+
+
+/* Start of boilerplate cgo prologue.  */
+#line 1 "cgo-gcc-export-header-prolog"
+
+#ifndef GO_CGO_PROLOGUE_H
+#define GO_CGO_PROLOGUE_H
+
+typedef signed char GoInt8;
+typedef unsigned char GoUint8;
+typedef short GoInt16;
+typedef unsigned short GoUint16;
+typedef int GoInt32;
+typedef unsigned int GoUint32;
+typedef long long GoInt64;
+typedef unsigned long long GoUint64;
+typedef GoInt64 GoInt;
+typedef GoUint64 GoUint;
+typedef __SIZE_TYPE__ GoUintptr;
+typedef float GoFloat32;
+typedef double GoFloat64;
+typedef float _Complex GoComplex64;
+typedef double _Complex GoComplex128;
+
+/*
+  static assertion to make sure the file is being used on architecture
+  at least with matching size of GoInt.
+*/
+typedef char _check_for_64_bit_pointer_matching_GoInt[sizeof(void*)==64/8 ? 1:-1];
+
+typedef _GoString_ GoString;
+typedef void *GoMap;
+typedef void *GoChan;
+typedef struct { void *t; void *v; } GoInterface;
+typedef struct { void *data; GoInt len; GoInt cap; } GoSlice;
+
+#endif
+
+/* End of boilerplate cgo prologue.  */
+
+#ifdef __cplusplus
+extern "C" {
+#endif
+
+
+extern int sum(int p0, int p1);
+
+#ifdef __cplusplus
+}
+#endif