[gostls13.git] / src / cmd / cgo / internal / test / test.go

// Copyright 2010 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.

// Test cases for cgo.
// Both the import "C" prologue and the main file are sorted by issue number.
// This file contains C definitions (not just declarations)
// and so it must NOT contain any //export directives on Go functions.
// See testx.go for exports.

package cgotest

/*
#include <complex.h>
#include <math.h>
#include <stdarg.h>
#include <stdbool.h>
#include <stddef.h>
#include <stdint.h>
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include <unistd.h>
#include <sys/stat.h>
#include <errno.h>
#cgo !darwin LDFLAGS: -lm

#ifndef WIN32
#include <pthread.h>
#include <signal.h>
#endif

// alignment tests

typedef unsigned char Uint8;
typedef unsigned short Uint16;

typedef enum {
 MOD1 = 0x0000,
 MODX = 0x8000
} SDLMod;

typedef enum {
 A1 = 1,
 B1 = 322,
 SDLK_LAST
} SDLKey;

typedef struct SDL_keysym {
        Uint8 scancode;
        SDLKey sym;
        SDLMod mod;
        Uint16 unicode;
} SDL_keysym;

typedef struct SDL_KeyboardEvent {
        Uint8 typ;
        Uint8 which;
        Uint8 state;
        SDL_keysym keysym;
} SDL_KeyboardEvent;

void makeEvent(SDL_KeyboardEvent *event) {
 unsigned char *p;
 int i;

 p = (unsigned char*)event;
 for (i=0; i<sizeof *event; i++) {
   p[i] = i;
 }
}

int same(SDL_KeyboardEvent* e, Uint8 typ, Uint8 which, Uint8 state, Uint8 scan, SDLKey sym, SDLMod mod, Uint16 uni) {
  return e->typ == typ && e->which == which && e->state == state && e->keysym.scancode == scan && e->keysym.sym == sym && e->keysym.mod == mod && e->keysym.unicode == uni;
}

void cTest(SDL_KeyboardEvent *event) {
 printf("C: %#x %#x %#x %#x %#x %#x %#x\n", event->typ, event->which, event->state,
   event->keysym.scancode, event->keysym.sym, event->keysym.mod, event->keysym.unicode);
 fflush(stdout);
}

// api

const char *greeting = "hello, world";

// basic test cases

#define SHIFT(x, y)  ((x)<<(y))
#define KILO SHIFT(1, 10)
#define UINT32VAL 0xc008427bU

enum E {
        Enum1 = 1,
        Enum2 = 2,
};

typedef unsigned char cgo_uuid_t[20];

void uuid_generate(cgo_uuid_t x) {
        x[0] = 0;
}

struct S {
        int x;
};

const char *cstr = "abcefghijklmnopqrstuvwxyzABCEFGHIJKLMNOPQRSTUVWXYZ1234567890";

extern enum E myConstFunc(struct S* const ctx, int const id, struct S **const filter);

enum E myConstFunc(struct S *const ctx, int const id, struct S **const filter) { return 0; }

int add(int x, int y) {
        return x+y;
};

// escape vs noescape

#cgo noescape handleGoStringPointerNoescape
void handleGoStringPointerNoescape(void *s) {}

void handleGoStringPointerEscape(void *s) {}

// Following mimics vulkan complex definitions for benchmarking cgocheck overhead.

typedef uint32_t VkFlags;
typedef VkFlags  VkDeviceQueueCreateFlags;
typedef uint32_t VkStructureType;

typedef struct VkDeviceQueueCreateInfo {
    VkStructureType             sType;
    const void*                 pNext;
    VkDeviceQueueCreateFlags    flags;
    uint32_t                    queueFamilyIndex;
    uint32_t                    queueCount;
    const float*                pQueuePriorities;
} VkDeviceQueueCreateInfo;

typedef struct VkPhysicalDeviceFeatures {
    uint32_t bools[56];
} VkPhysicalDeviceFeatures;

typedef struct VkDeviceCreateInfo {
    VkStructureType                    sType;
    const void*                        pNext;
    VkFlags                            flags;
    uint32_t                           queueCreateInfoCount;
    const VkDeviceQueueCreateInfo*     pQueueCreateInfos;
    uint32_t                           enabledLayerCount;
    const char* const*                 ppEnabledLayerNames;
    uint32_t                           enabledExtensionCount;
    const char* const*                 ppEnabledExtensionNames;
    const VkPhysicalDeviceFeatures*    pEnabledFeatures;
} VkDeviceCreateInfo;

void handleComplexPointer(VkDeviceCreateInfo *a0) {}
void handleComplexPointer8(
        VkDeviceCreateInfo *a0, VkDeviceCreateInfo *a1, VkDeviceCreateInfo *a2, VkDeviceCreateInfo *a3,
        VkDeviceCreateInfo *a4, VkDeviceCreateInfo *a5, VkDeviceCreateInfo *a6, VkDeviceCreateInfo *a7
) {}

// complex alignment

struct {
        float x;
        _Complex float y;
} cplxAlign = { 3.14, 2.17 };

// constants and pointer checking

#define CheckConstVal 0

typedef struct {
        int *p;
} CheckConstStruct;

static void CheckConstFunc(CheckConstStruct *p, int e) {}

// duplicate symbol

int base_symbol = 0;
#define alias_one base_symbol
#define alias_two base_symbol

// function pointer variables

typedef int (*intFunc) ();

int
bridge_int_func(intFunc f)
{
        return f();
}

int fortytwo()
{
        return 42;
}

// issue 1222
typedef union {
        long align;
} xxpthread_mutex_t;
struct ibv_async_event {
        union {
                int x;
        } element;
};
struct ibv_context {
        xxpthread_mutex_t mutex;
};

// issue 1635
// Mac OS X's gcc will generate scattered relocation 2/1 for
// this function on Darwin/386, and 8l couldn't handle it.
// this example is in issue 1635
void scatter() {
        void *p = scatter;
        printf("scatter = %p\n", p);
}

// Adding this explicit extern declaration makes this a test for
// https://gcc.gnu.org/PR68072 aka https://golang.org/issue/13344 .
// It used to cause a cgo error when building with GCC 6.
extern int hola;

// this example is in issue 3253
int hola = 0;
int testHola() { return hola; }

// issue 3250
#ifdef WIN32
void testSendSIG() {}
#else
static void *thread(void *p) {
        const int M = 100;
        int i;
        (void)p;
        for (i = 0; i < M; i++) {
                pthread_kill(pthread_self(), SIGCHLD);
                usleep(rand() % 20 + 5);
        }
        return NULL;
}
void testSendSIG() {
        const int N = 20;
        int i;
        pthread_t tid[N];
        for (i = 0; i < N; i++) {
                usleep(rand() % 200 + 100);
                pthread_create(&tid[i], 0, thread, NULL);
        }
        for (i = 0; i < N; i++)
                pthread_join(tid[i], 0);
}
#endif

// issue 3261
// libgcc on ARM might be compiled as thumb code, but our 5l
// can't handle that, so we have to disable this test on arm.
#ifdef __ARMEL__
int vabs(int x) {
        puts("testLibgcc is disabled on ARM because 5l cannot handle thumb library.");
        return (x < 0) ? -x : x;
}
#elif defined(__arm64__) && defined(__clang__)
int vabs(int x) {
        puts("testLibgcc is disabled on ARM64 with clang due to lack of libgcc.");
        return (x < 0) ? -x : x;
}
#else
int __absvsi2(int); // dummy prototype for libgcc function
// we shouldn't name the function abs, as gcc might use
// the builtin one.
int vabs(int x) { return __absvsi2(x); }
#endif


// issue 3729
// access errno from void C function
const char _expA = 0x42;
const float _expB = 3.14159;
const short _expC = 0x55aa;
const int _expD = 0xdeadbeef;

#ifdef WIN32
void g(void) {}
void g2(int x, char a, float b, short c, int d) {}
#else

void g(void) {
        errno = E2BIG;
}

// try to pass some non-trivial arguments to function g2
void g2(int x, char a, float b, short c, int d) {
        if (a == _expA && b == _expB && c == _expC && d == _expD)
                errno = x;
        else
                errno = -1;
}
#endif

// issue 3945
// Test that cgo reserves enough stack space during cgo call.
// See https://golang.org/issue/3945 for details.
void say() {
        printf("%s from C\n", "hello");
}

// issue 4054 part 1 - other half in testx.go

typedef enum {
        A = 0,
        B,
        C,
        D,
        E,
        F,
        G,
        H,
        II,
        J,
} issue4054a;

// issue 4339
// We've historically permitted #include <>, so test it here.  Issue 29333.
// Also see issue 41059.
#include <issue4339.h>

// issue 4417
// cmd/cgo: bool alignment/padding issue.
// bool alignment is wrong and causing wrong arguments when calling functions.
static int c_bool(bool a, bool b, int c, bool d, bool e)  {
   return c;
}

// issue 4857
#cgo CFLAGS: -Werror
const struct { int a; } *issue4857() { return (void *)0; }

// issue 5224
// Test that the #cgo CFLAGS directive works,
// with and without platform filters.
#cgo CFLAGS: -DCOMMON_VALUE=123
#cgo windows CFLAGS: -DIS_WINDOWS=1
#cgo !windows CFLAGS: -DIS_WINDOWS=0
int common = COMMON_VALUE;
int is_windows = IS_WINDOWS;

// issue 5227
// linker incorrectly treats common symbols and
// leaves them undefined.

typedef struct {
        int Count;
} Fontinfo;

Fontinfo SansTypeface;

extern void init();

Fontinfo loadfont() {
        Fontinfo f = {0};
        return f;
}

void init() {
        SansTypeface = loadfont();
}

// issue 5242
// Cgo incorrectly computed the alignment of structs
// with no Go accessible fields as 0, and then panicked on
// modulo-by-zero computations.

// issue 50987
// disable arm64 GCC warnings
#cgo CFLAGS: -Wno-psabi -Wno-unknown-warning-option

typedef struct {
} foo;

typedef struct {
        int x : 1;
} bar;

int issue5242(foo f, bar b) {
        return 5242;
}

// issue 5337
// Verify that we can withstand SIGPROF received on foreign threads

#ifdef WIN32
void test5337() {}
#else
static void *thread1(void *p) {
        (void)p;
        pthread_kill(pthread_self(), SIGPROF);
        return NULL;
}
void test5337() {
        pthread_t tid;
        pthread_create(&tid, 0, thread1, NULL);
        pthread_join(tid, 0);
}
#endif

// issue 5603

const long long issue5603exp = 0x12345678;
long long issue5603foo0() { return issue5603exp; }
long long issue5603foo1(void *p) { return issue5603exp; }
long long issue5603foo2(void *p, void *q) { return issue5603exp; }
long long issue5603foo3(void *p, void *q, void *r) { return issue5603exp; }
long long issue5603foo4(void *p, void *q, void *r, void *s) { return issue5603exp; }

// issue 5740

int test5740a(void), test5740b(void);

// issue 5986
static void output5986()
{
    int current_row = 0, row_count = 0;
    double sum_squares = 0;
    double d;
    do {
        if (current_row == 10) {
            current_row = 0;
        }
        ++row_count;
    }
    while (current_row++ != 1);
    d =  sqrt(sum_squares / row_count);
    printf("sqrt is: %g\n", d);
}

// issue 6128
// Test handling of #defined names in clang.
// NOTE: Must use hex, or else a shortcut for decimals
// in cgo avoids trying to pass this to clang.
#define X 0x1

// issue 6472
typedef struct
{
        struct
        {
            int x;
        } y[16];
} z;

// issue 6612
// Test new scheme for deciding whether C.name is an expression, type, constant.
// Clang silences some warnings when the name is a #defined macro, so test those too
// (even though we now use errors exclusively, not warnings).

void myfunc(void) {}
int myvar = 5;
const char *mytext = "abcdef";
typedef int mytype;
enum {
        myenum = 1234,
};

#define myfunc_def myfunc
#define myvar_def myvar
#define mytext_def mytext
#define mytype_def mytype
#define myenum_def myenum
#define myint_def 12345
#define myfloat_def 1.5
#define mystring_def "hello"

// issue 6907
char* Issue6907CopyString(_GoString_ s) {
        size_t n;
        const char *p;
        char *r;

        n = _GoStringLen(s);
        p = _GoStringPtr(s);
        r = malloc(n + 1);
        memmove(r, p, n);
        r[n] = '\0';
        return r;
}

// issue 7560
typedef struct {
        char x;
        long y;
} __attribute__((__packed__)) misaligned;

int
offset7560(void)
{
        return (uintptr_t)&((misaligned*)0)->y;
}

// issue 7786
// No runtime test, just make sure that typedef and struct/union/class are interchangeable at compile time.

struct test7786;
typedef struct test7786 typedef_test7786;
void f7786(struct test7786 *ctx) {}
void g7786(typedef_test7786 *ctx) {}

typedef struct body7786 typedef_body7786;
struct body7786 { int x; };
void b7786(struct body7786 *ctx) {}
void c7786(typedef_body7786 *ctx) {}

typedef union union7786 typedef_union7786;
void u7786(union union7786 *ctx) {}
void v7786(typedef_union7786 *ctx) {}

// issue 8092
// Test that linker defined symbols (e.g., text, data) don't
// conflict with C symbols.
char text[] = "text";
char data[] = "data";
char *ctext(void) { return text; }
char *cdata(void) { return data; }

// issue 8428
// Cgo inconsistently translated zero size arrays.

struct issue8428one {
        char b;
        char rest[];
};

struct issue8428two {
        void *p;
        char b;
        char rest[0];
        char pad;
};

struct issue8428three {
        char w[1][2][3][0];
        char x[2][3][0][1];
        char y[3][0][1][2];
        char z[0][1][2][3];
};

// issue 8331 part 1 - part 2 in testx.go
// A typedef of an unnamed struct is the same struct when
// #include'd twice.  No runtime test; just make sure it compiles.
#include "issue8331.h"

// issue 8368 and 8441
// Recursive struct definitions didn't work.
// No runtime test; just make sure it compiles.
typedef struct one one;
typedef struct two two;
struct one {
        two *x;
};
struct two {
        one *x;
};

// issue 8811

extern int issue8811Initialized;
extern void issue8811Init();

void issue8811Execute() {
        if(!issue8811Initialized)
                issue8811Init();
}

// issue 8945

typedef void (*PFunc8945)();
PFunc8945 func8945;

// issue 9557

struct issue9557_t {
  int a;
} test9557bar = { 42 };
struct issue9557_t *issue9557foo = &test9557bar;

// issue 10303
// Pointers passed to C were not marked as escaping (bug in cgo).

typedef int *intptr;

void setintstar(int *x) {
        *x = 1;
}

void setintptr(intptr x) {
        *x = 1;
}

void setvoidptr(void *x) {
        *(int*)x = 1;
}

typedef struct Struct Struct;
struct Struct {
        int *P;
};

void setstruct(Struct s) {
        *s.P = 1;
}

// issue 11925
// Structs with zero-length trailing fields are now padded by the Go compiler.

struct a11925 {
        int i;
        char a[0];
        char b[0];
};

struct b11925 {
        int i;
        char a[0];
        char b[];
};

// issue 12030
void issue12030conv(char *buf, double x) {
        sprintf(buf, "d=%g", x);
}

// issue 14838

int check_cbytes(char *b, size_t l) {
        int i;
        for (i = 0; i < l; i++) {
                if (b[i] != i) {
                        return 0;
                }
        }
        return 1;
}

// issue 17065
// Test that C symbols larger than a page play nicely with the race detector.
int ii[65537];

// issue 17537
// The void* cast introduced by cgo to avoid problems
// with const/volatile qualifiers breaks C preprocessor macros that
// emulate functions.

typedef struct {
        int i;
} S17537;

int I17537(S17537 *p);

#define I17537(p) ((p)->i)

// Calling this function used to fail without the cast.
const int F17537(const char **p) {
        return **p;
}

// issue 17723
// API compatibility checks

typedef char *cstring_pointer;
static void cstring_pointer_fun(cstring_pointer dummy) { }
const char *api_hello = "hello!";

// Calling this function used to trigger an error from the C compiler
// (issue 18298).
void F18298(const void *const *p) {
}

// Test that conversions between typedefs work as they used to.
typedef const void *T18298_1;
struct S18298 { int i; };
typedef const struct S18298 *T18298_2;
void G18298(T18298_1 t) {
}

// issue 18126
// cgo check of void function returning errno.
void Issue18126C(void **p) {}

// issue 18720

#define HELLO "hello"
#define WORLD "world"
#define HELLO_WORLD HELLO "\000" WORLD

struct foo { char c; };
#define SIZE_OF(x) sizeof(x)
#define SIZE_OF_FOO SIZE_OF(struct foo)
#define VAR1 VAR
#define VAR var
int var = 5;

#define ADDR &var

#define CALL fn()
int fn(void) {
        return ++var;
}

// issue 20129

int issue20129 = 0;
typedef void issue20129Void;
issue20129Void issue20129Foo() {
        issue20129 = 1;
}
typedef issue20129Void issue20129Void2;
issue20129Void2 issue20129Bar() {
        issue20129 = 2;
}

// issue 20369
#define XUINT64_MAX        18446744073709551615ULL

// issue 21668
// Fail to guess the kind of the constant "x".
// No runtime test; just make sure it compiles.
const int x21668 = 42;

// issue 21708
#define CAST_TO_INT64 (int64_t)(-1)

// issue 21809
// Compile C `typedef` to go type aliases.

typedef long MySigned_t;
// tests alias-to-alias
typedef MySigned_t MySigned2_t;
long takes_long(long x) { return x * x; }
MySigned_t takes_typedef(MySigned_t x) { return x * x; }

// issue 22906

// It's going to be hard to include a whole real JVM to test this.
// So we'll simulate a really easy JVM using just the parts we need.
// This is the relevant part of jni.h.

struct _jobject;

typedef struct _jobject *jobject;
typedef jobject jclass;
typedef jobject jthrowable;
typedef jobject jstring;
typedef jobject jarray;
typedef jarray jbooleanArray;
typedef jarray jbyteArray;
typedef jarray jcharArray;
typedef jarray jshortArray;
typedef jarray jintArray;
typedef jarray jlongArray;
typedef jarray jfloatArray;
typedef jarray jdoubleArray;
typedef jarray jobjectArray;

typedef jobject jweak;

// Note: jvalue is already a non-pointer type due to it being a C union.

// issue 22958

typedef struct {
        unsigned long long f8  : 8;
        unsigned long long f16 : 16;
        unsigned long long f24 : 24;
        unsigned long long f32 : 32;
        unsigned long long f40 : 40;
        unsigned long long f48 : 48;
        unsigned long long f56 : 56;
        unsigned long long f64 : 64;
} issue22958Type;

// issue 23356
int a(void) { return 5; };
int r(void) { return 3; };

// issue 23720
typedef int *issue23720A;
typedef const int *issue23720B;
void issue23720F(issue23720B a) {}

// issue 24206
#if defined(__linux__) && defined(__x86_64__)
#include <sys/mman.h>
// Returns string with null byte at the last valid address
char* dangerousString1() {
        int pageSize = 4096;
        char *data = mmap(0, 2 * pageSize, PROT_READ|PROT_WRITE, MAP_ANON|MAP_PRIVATE, 0, 0);
        mprotect(data + pageSize,pageSize,PROT_NONE);
        int start = pageSize - 123 - 1; // last 123 bytes of first page + 1 null byte
        int i = start;
        for (; i < pageSize; i++) {
        data[i] = 'x';
        }
        data[pageSize -1 ] = 0;
        return data+start;
}

char* dangerousString2() {
        int pageSize = 4096;
        char *data = mmap(0, 3 * pageSize, PROT_READ|PROT_WRITE, MAP_ANON|MAP_PRIVATE, 0, 0);
        mprotect(data + 2 * pageSize,pageSize,PROT_NONE);
        int start = pageSize - 123 - 1; // last 123 bytes of first page + 1 null byte
        int i = start;
        for (; i < 2 * pageSize; i++) {
        data[i] = 'x';
        }
        data[2*pageSize -1 ] = 0;
        return data+start;
}
#else
char *dangerousString1() { return NULL; }
char *dangerousString2() { return NULL; }
#endif

// issue 26066
const unsigned long long int issue26066 = (const unsigned long long) -1;

// issue 26517
// Introduce two pointer types which are distinct, but have the same
// base type. Make sure that both of those pointer types get resolved
// correctly. Before the fix for 26517 if one of these pointer types
// was resolved before the other one was processed, the second one
// would never be resolved.
// Before this issue was fixed this test failed on Windows,
// where va_list expands to a named char* type.
typedef va_list TypeOne;
typedef char *TypeTwo;

// issue 28540

static void twoargs1(void *p, int n) {}
static void *twoargs2() { return 0; }
static int twoargs3(void * p) { return 0; }

// issue 28545
// Failed to add type conversion for negative constant.

static void issue28545F(char **p, int n, complex double a) {}

// issue 28772 part 1 - part 2 in testx.go
// Failed to add type conversion for Go constant set to C constant.
// No runtime test; just make sure it compiles.

#define issue28772Constant 1

// issue 28896
// cgo was incorrectly adding padding after a packed struct.
typedef struct {
        void *f1;
        uint32_t f2;
} __attribute__((__packed__)) innerPacked;

typedef struct {
        innerPacked g1;
        uint64_t g2;
} outerPacked;

typedef struct {
        void *f1;
        uint32_t f2;
} innerUnpacked;

typedef struct {
        innerUnpacked g1;
        uint64_t g2;
} outerUnpacked;

size_t offset(int x) {
        switch (x) {
        case 0:
                return offsetof(innerPacked, f2);
        case 1:
                return offsetof(outerPacked, g2);
        case 2:
                return offsetof(innerUnpacked, f2);
        case 3:
                return offsetof(outerUnpacked, g2);
        default:
                abort();
        }
}

// issue 29748

typedef struct { char **p; } S29748;
static int f29748(S29748 *p) { return 0; }

// issue 29781
// Error with newline inserted into constant expression.
// Compilation test only, nothing to run.

static void issue29781F(char **p, int n) {}
#define ISSUE29781C 0

// issue 31093
static uint16_t issue31093F(uint16_t v) { return v; }

// issue 32579
typedef struct S32579 { unsigned char data[1]; } S32579;

// issue 37033, cgo.Handle
extern void GoFunc37033(uintptr_t handle);
void cFunc37033(uintptr_t handle) { GoFunc37033(handle); }

// issue 38649
// Test that #define'd type aliases work.
#define netbsd_gid unsigned int

// issue 40494
// Inconsistent handling of tagged enum and union types.
enum Enum40494 { X_40494 };
union Union40494 { int x; };
void issue40494(enum Enum40494 e, union Union40494* up) {}

// Issue 45451, bad handling of go:notinheap types.
typedef struct issue45451Undefined issue45451;

// Issue 49633, example of cgo.Handle with void*.
extern void GoFunc49633(void*);
void cfunc49633(void *context) { GoFunc49633(context); }

*/
import "C"

import (
        "context"
        "fmt"
        "math"
        "math/rand"
        "os"
        "os/signal"
        "reflect"
        "runtime"
        "runtime/cgo"
        "sync"
        "syscall"
        "testing"
        "time"
        "unsafe"
)

// alignment

func testAlign(t *testing.T) {
        var evt C.SDL_KeyboardEvent
        C.makeEvent(&evt)
        if C.same(&evt, evt.typ, evt.which, evt.state, evt.keysym.scancode, evt.keysym.sym, evt.keysym.mod, evt.keysym.unicode) == 0 {
                t.Error("*** bad alignment")
                C.cTest(&evt)
                t.Errorf("Go: %#x %#x %#x %#x %#x %#x %#x\n",
                        evt.typ, evt.which, evt.state, evt.keysym.scancode,
                        evt.keysym.sym, evt.keysym.mod, evt.keysym.unicode)
                t.Error(evt)
        }
}

// api

const greeting = "hello, world"

type testPair struct {
        Name      string
        Got, Want interface{}
}

var testPairs = []testPair{
        {"GoString", C.GoString(C.greeting), greeting},
        {"GoStringN", C.GoStringN(C.greeting, 5), greeting[:5]},
        {"GoBytes", C.GoBytes(unsafe.Pointer(C.greeting), 5), []byte(greeting[:5])},
}

func testHelpers(t *testing.T) {
        for _, pair := range testPairs {
                if !reflect.DeepEqual(pair.Got, pair.Want) {
                        t.Errorf("%s: got %#v, want %#v", pair.Name, pair.Got, pair.Want)
                }
        }
}

// basic test cases

const EINVAL = C.EINVAL /* test #define */

var KILO = C.KILO

func uuidgen() {
        var uuid C.cgo_uuid_t
        C.uuid_generate(&uuid[0])
}

func Strtol(s string, base int) (int, error) {
        p := C.CString(s)
        n, err := C.strtol(p, nil, C.int(base))
        C.free(unsafe.Pointer(p))
        return int(n), err
}

func Atol(s string) int {
        p := C.CString(s)
        n := C.atol(p)
        C.free(unsafe.Pointer(p))
        return int(n)
}

func testConst(t *testing.T) {
        C.myConstFunc(nil, 0, nil)
}

func testEnum(t *testing.T) {
        if C.Enum1 != 1 || C.Enum2 != 2 {
                t.Error("bad enum", C.Enum1, C.Enum2)
        }
}

func testNamedEnum(t *testing.T) {
        e := new(C.enum_E)

        *e = C.Enum1
        if *e != 1 {
                t.Error("bad enum", C.Enum1)
        }

        *e = C.Enum2
        if *e != 2 {
                t.Error("bad enum", C.Enum2)
        }
}

func testCastToEnum(t *testing.T) {
        e := C.enum_E(C.Enum1)
        if e != 1 {
                t.Error("bad enum", C.Enum1)
        }

        e = C.enum_E(C.Enum2)
        if e != 2 {
                t.Error("bad enum", C.Enum2)
        }
}

func testAtol(t *testing.T) {
        l := Atol("123")
        if l != 123 {
                t.Error("Atol 123: ", l)
        }
}

func testErrno(t *testing.T) {
        p := C.CString("no-such-file")
        m := C.CString("r")
        f, err := C.fopen(p, m)
        C.free(unsafe.Pointer(p))
        C.free(unsafe.Pointer(m))
        if err == nil {
                C.fclose(f)
                t.Fatalf("C.fopen: should fail")
        }
        if err != syscall.ENOENT {
                t.Fatalf("C.fopen: unexpected error: %v", err)
        }
}

func testMultipleAssign(t *testing.T) {
        p := C.CString("234")
        n, m := C.strtol(p, nil, 345), C.strtol(p, nil, 10)
        if runtime.GOOS == "openbsd" {
                // Bug in OpenBSD strtol(3) - base > 36 succeeds.
                if (n != 0 && n != 239089) || m != 234 {
                        t.Fatal("Strtol x2: ", n, m)
                }
        } else if n != 0 || m != 234 {
                t.Fatal("Strtol x2: ", n, m)
        }
        C.free(unsafe.Pointer(p))
}

var (
        cuint  = (C.uint)(0)
        culong C.ulong
        cchar  C.char
)

type Context struct {
        ctx *C.struct_ibv_context
}

func benchCgoCall(b *testing.B) {
        b.Run("add-int", func(b *testing.B) {
                const x = C.int(2)
                const y = C.int(3)

                for i := 0; i < b.N; i++ {
                        C.add(x, y)
                }
        })

        b.Run("one-pointer", func(b *testing.B) {
                var a0 C.VkDeviceCreateInfo
                for i := 0; i < b.N; i++ {
                        C.handleComplexPointer(&a0)
                }
        })
        b.Run("string-pointer-escape", func(b *testing.B) {
                for i := 0; i < b.N; i++ {
                        var s string
                        C.handleGoStringPointerEscape(unsafe.Pointer(&s))
                }
        })
        b.Run("string-pointer-noescape", func(b *testing.B) {
                for i := 0; i < b.N; i++ {
                        var s string
                        C.handleGoStringPointerNoescape(unsafe.Pointer(&s))
                }
        })
        b.Run("eight-pointers", func(b *testing.B) {
                var a0, a1, a2, a3, a4, a5, a6, a7 C.VkDeviceCreateInfo
                for i := 0; i < b.N; i++ {
                        C.handleComplexPointer8(&a0, &a1, &a2, &a3, &a4, &a5, &a6, &a7)
                }
        })
        b.Run("eight-pointers-nil", func(b *testing.B) {
                var a0, a1, a2, a3, a4, a5, a6, a7 *C.VkDeviceCreateInfo
                for i := 0; i < b.N; i++ {
                        C.handleComplexPointer8(a0, a1, a2, a3, a4, a5, a6, a7)
                }
        })
        b.Run("eight-pointers-array", func(b *testing.B) {
                var a [8]C.VkDeviceCreateInfo
                for i := 0; i < b.N; i++ {
                        C.handleComplexPointer8(&a[0], &a[1], &a[2], &a[3], &a[4], &a[5], &a[6], &a[7])
                }
        })
        b.Run("eight-pointers-slice", func(b *testing.B) {
                a := make([]C.VkDeviceCreateInfo, 8)
                for i := 0; i < b.N; i++ {
                        C.handleComplexPointer8(&a[0], &a[1], &a[2], &a[3], &a[4], &a[5], &a[6], &a[7])
                }
        })
}

// Benchmark measuring overhead from Go to C and back to Go (via a callback)
func benchCallback(b *testing.B) {
        var x = false
        for i := 0; i < b.N; i++ {
                nestedCall(func() { x = true })
        }
        if !x {
                b.Fatal("nestedCall was not invoked")
        }
}

var sinkString string

func benchGoString(b *testing.B) {
        for i := 0; i < b.N; i++ {
                sinkString = C.GoString(C.cstr)
        }
        const want = "abcefghijklmnopqrstuvwxyzABCEFGHIJKLMNOPQRSTUVWXYZ1234567890"
        if sinkString != want {
                b.Fatalf("%q != %q", sinkString, want)
        }
}

// Static (build-time) test that syntax traversal visits all operands of s[i:j:k].
func sliceOperands(array [2000]int) {
        _ = array[C.KILO:C.KILO:C.KILO] // no type error
}

// set in cgo_thread_lock.go init
var testThreadLockFunc = func(*testing.T) {}

// complex alignment

func TestComplexAlign(t *testing.T) {
        if C.cplxAlign.x != 3.14 {
                t.Errorf("got %v, expected 3.14", C.cplxAlign.x)
        }
        if C.cplxAlign.y != 2.17 {
                t.Errorf("got %v, expected 2.17", C.cplxAlign.y)
        }
}

// constants and pointer checking

func testCheckConst(t *testing.T) {
        // The test is that this compiles successfully.
        p := C.malloc(C.size_t(unsafe.Sizeof(C.int(0))))
        defer C.free(p)
        C.CheckConstFunc(&C.CheckConstStruct{(*C.int)(p)}, C.CheckConstVal)
}

// duplicate symbol

func duplicateSymbols() {
        fmt.Printf("%v %v %v\n", C.base_symbol, C.alias_one, C.alias_two)
}

// environment

// This is really an os package test but here for convenience.
func testSetEnv(t *testing.T) {
        if runtime.GOOS == "windows" {
                // Go uses SetEnvironmentVariable on windows. However,
                // C runtime takes a *copy* at process startup of the
                // OS environment, and stores it in environ/envp.
                // It is this copy that getenv/putenv manipulate.
                t.Logf("skipping test")
                return
        }
        const key = "CGO_OS_TEST_KEY"
        const val = "CGO_OS_TEST_VALUE"
        os.Setenv(key, val)
        keyc := C.CString(key)
        defer C.free(unsafe.Pointer(keyc))
        v := C.getenv(keyc)
        if uintptr(unsafe.Pointer(v)) == 0 {
                t.Fatal("getenv returned NULL")
        }
        vs := C.GoString(v)
        if vs != val {
                t.Fatalf("getenv() = %q; want %q", vs, val)
        }
}

// function pointer variables

func callBridge(f C.intFunc) int {
        return int(C.bridge_int_func(f))
}

func callCBridge(f C.intFunc) C.int {
        return C.bridge_int_func(f)
}

func testFpVar(t *testing.T) {
        const expected = 42
        f := C.intFunc(C.fortytwo)
        res1 := C.bridge_int_func(f)
        if r1 := int(res1); r1 != expected {
                t.Errorf("got %d, want %d", r1, expected)
        }
        res2 := callCBridge(f)
        if r2 := int(res2); r2 != expected {
                t.Errorf("got %d, want %d", r2, expected)
        }
        r3 := callBridge(f)
        if r3 != expected {
                t.Errorf("got %d, want %d", r3, expected)
        }
}

// issue 1222
type AsyncEvent struct {
        event C.struct_ibv_async_event
}

// issue 1635

func test1635(t *testing.T) {
        C.scatter()
        if v := C.hola; v != 0 {
                t.Fatalf("C.hola is %d, should be 0", v)
        }
        if v := C.testHola(); v != 0 {
                t.Fatalf("C.testHola() is %d, should be 0", v)
        }
}

// issue 2470

func testUnsignedInt(t *testing.T) {
        a := (int64)(C.UINT32VAL)
        b := (int64)(0xc008427b)
        if a != b {
                t.Errorf("Incorrect unsigned int - got %x, want %x", a, b)
        }
}

// issue 3250

func test3250(t *testing.T) {
        if runtime.GOOS == "windows" {
                t.Skip("not applicable on windows")
        }

        t.Skip("skipped, see golang.org/issue/5885")
        var (
                thres = 1
                sig   = syscall_dot_SIGCHLD
        )
        type result struct {
                n   int
                sig os.Signal
        }
        var (
                sigCh     = make(chan os.Signal, 10)
                waitStart = make(chan struct{})
                waitDone  = make(chan result)
        )

        signal.Notify(sigCh, sig)

        go func() {
                n := 0
                alarm := time.After(time.Second * 3)
                for {
                        select {
                        case <-waitStart:
                                waitStart = nil
                        case v := <-sigCh:
                                n++
                                if v != sig || n > thres {
                                        waitDone <- result{n, v}
                                        return
                                }
                        case <-alarm:
                                waitDone <- result{n, sig}
                                return
                        }
                }
        }()

        waitStart <- struct{}{}
        C.testSendSIG()
        r := <-waitDone
        if r.sig != sig {
                t.Fatalf("received signal %v, but want %v", r.sig, sig)
        }
        t.Logf("got %d signals\n", r.n)
        if r.n <= thres {
                t.Fatalf("expected more than %d", thres)
        }
}

// issue 3261

func testLibgcc(t *testing.T) {
        var table = []struct {
                in, out C.int
        }{
                {0, 0},
                {1, 1},
                {-42, 42},
                {1000300, 1000300},
                {1 - 1<<31, 1<<31 - 1},
        }
        for _, v := range table {
                if o := C.vabs(v.in); o != v.out {
                        t.Fatalf("abs(%d) got %d, should be %d", v.in, o, v.out)
                        return
                }
        }
}

// issue 3729

func test3729(t *testing.T) {
        if runtime.GOOS == "windows" {
                t.Skip("skipping on windows")
        }

        _, e := C.g()
        if e != syscall.E2BIG {
                t.Errorf("got %q, expect %q", e, syscall.E2BIG)
        }
        _, e = C.g2(C.EINVAL, C._expA, C._expB, C._expC, C._expD)
        if e != syscall.EINVAL {
                t.Errorf("got %q, expect %q", e, syscall.EINVAL)
        }
}

// issue 3945

func testPrintf(t *testing.T) {
        C.say()
}

// issue 4054

var issue4054a = []int{C.A, C.B, C.C, C.D, C.E, C.F, C.G, C.H, C.I, C.J}

// issue 4339

func test4339(t *testing.T) {
        C.handle4339(&C.exported4339)
}

// issue 4417

func testBoolAlign(t *testing.T) {
        b := C.c_bool(true, true, 10, true, false)
        if b != 10 {
                t.Fatalf("found %d expected 10\n", b)
        }
        b = C.c_bool(true, true, 5, true, true)
        if b != 5 {
                t.Fatalf("found %d expected 5\n", b)
        }
        b = C.c_bool(true, true, 3, true, false)
        if b != 3 {
                t.Fatalf("found %d expected 3\n", b)
        }
        b = C.c_bool(false, false, 1, true, false)
        if b != 1 {
                t.Fatalf("found %d expected 1\n", b)
        }
        b = C.c_bool(false, true, 200, true, false)
        if b != 200 {
                t.Fatalf("found %d expected 200\n", b)
        }
}

// issue 4857

func test4857() {
        _ = C.issue4857()
}

// issue 5224

func testCflags(t *testing.T) {
        is_windows := C.is_windows == 1
        if is_windows != (runtime.GOOS == "windows") {
                t.Errorf("is_windows: %v, runtime.GOOS: %s", is_windows, runtime.GOOS)
        }
        if C.common != 123 {
                t.Errorf("common: %v (expected 123)", C.common)
        }
}

// issue 5227

func test5227(t *testing.T) {
        C.init()
}

func selectfont() C.Fontinfo {
        return C.SansTypeface
}

// issue 5242

func test5242(t *testing.T) {
        if got := C.issue5242(C.foo{}, C.bar{}); got != 5242 {
                t.Errorf("got %v", got)
        }
}

func test5603(t *testing.T) {
        var x [5]int64
        exp := int64(C.issue5603exp)
        x[0] = int64(C.issue5603foo0())
        x[1] = int64(C.issue5603foo1(nil))
        x[2] = int64(C.issue5603foo2(nil, nil))
        x[3] = int64(C.issue5603foo3(nil, nil, nil))
        x[4] = int64(C.issue5603foo4(nil, nil, nil, nil))
        for i, v := range x {
                if v != exp {
                        t.Errorf("issue5603foo%d() returns %v, expected %v", i, v, exp)
                }
        }
}

// issue 5337

func test5337(t *testing.T) {
        C.test5337()
}

// issue 5740

func test5740(t *testing.T) {
        if v := C.test5740a() + C.test5740b(); v != 5 {
                t.Errorf("expected 5, got %v", v)
        }
}

// issue 5986

func test5986(t *testing.T) {
        C.output5986()
}

// issue 6128

func test6128() {
        // nothing to run, just make sure this compiles.
        _ = C.X
}

// issue 6390

func test6390(t *testing.T) {
        p1 := C.malloc(1024)
        if p1 == nil {
                t.Fatalf("C.malloc(1024) returned nil")
        }
        p2 := C.malloc(0)
        if p2 == nil {
                t.Fatalf("C.malloc(0) returned nil")
        }
        C.free(p1)
        C.free(p2)
}

func test6472() {
        // nothing to run, just make sure this compiles
        s := new(C.z)
        println(s.y[0].x)
}

// issue 6506

func test6506() {
        // nothing to run, just make sure this compiles
        var x C.size_t

        C.calloc(x, x)
        C.malloc(x)
        C.realloc(nil, x)
        C.memcpy(nil, nil, x)
        C.memcmp(nil, nil, x)
        C.memmove(nil, nil, x)
        C.strncpy(nil, nil, x)
        C.strncmp(nil, nil, x)
        C.strncat(nil, nil, x)
        x = C.strxfrm(nil, nil, x)
        C.memchr(nil, 0, x)
        x = C.strcspn(nil, nil)
        x = C.strspn(nil, nil)
        C.memset(nil, 0, x)
        x = C.strlen(nil)
        _ = x
}

// issue 6612

func testNaming(t *testing.T) {
        C.myfunc()
        C.myfunc_def()
        if v := C.myvar; v != 5 {
                t.Errorf("C.myvar = %d, want 5", v)
        }
        if v := C.myvar_def; v != 5 {
                t.Errorf("C.myvar_def = %d, want 5", v)
        }
        if s := C.GoString(C.mytext); s != "abcdef" {
                t.Errorf("C.mytext = %q, want %q", s, "abcdef")
        }
        if s := C.GoString(C.mytext_def); s != "abcdef" {
                t.Errorf("C.mytext_def = %q, want %q", s, "abcdef")
        }
        if c := C.myenum; c != 1234 {
                t.Errorf("C.myenum = %v, want 1234", c)
        }
        if c := C.myenum_def; c != 1234 {
                t.Errorf("C.myenum_def = %v, want 1234", c)
        }
        {
                const c = C.myenum
                if c != 1234 {
                        t.Errorf("C.myenum as const = %v, want 1234", c)
                }
        }
        {
                const c = C.myenum_def
                if c != 1234 {
                        t.Errorf("C.myenum as const = %v, want 1234", c)
                }
        }
        if c := C.myint_def; c != 12345 {
                t.Errorf("C.myint_def = %v, want 12345", c)
        }
        {
                const c = C.myint_def
                if c != 12345 {
                        t.Errorf("C.myint as const = %v, want 12345", c)
                }
        }

        if c := C.myfloat_def; c != 1.5 {
                t.Errorf("C.myint_def = %v, want 1.5", c)
        }
        {
                const c = C.myfloat_def
                if c != 1.5 {
                        t.Errorf("C.myint as const = %v, want 1.5", c)
                }
        }

        if s := C.mystring_def; s != "hello" {
                t.Errorf("C.mystring_def = %q, want %q", s, "hello")
        }
}

// issue 6907

func test6907(t *testing.T) {
        want := "yarn"
        if got := C.GoString(C.Issue6907CopyString(want)); got != want {
                t.Errorf("C.GoString(C.Issue6907CopyString(%q)) == %q, want %q", want, got, want)
        }
}

// issue 7560

func test7560(t *testing.T) {
        // some mingw don't implement __packed__ correctly.
        if C.offset7560() != 1 {
                t.Skip("C compiler did not pack struct")
        }

        // C.misaligned should have x but then a padding field to get to the end of the struct.
        // There should not be a field named 'y'.
        var v C.misaligned
        rt := reflect.TypeOf(&v).Elem()
        if rt.NumField() != 2 || rt.Field(0).Name != "x" || rt.Field(1).Name != "_" {
                t.Errorf("unexpected fields in C.misaligned:\n")
                for i := 0; i < rt.NumField(); i++ {
                        t.Logf("%+v\n", rt.Field(i))
                }
        }
}

// issue 7786

func f() {
        var x1 *C.typedef_test7786
        var x2 *C.struct_test7786
        x1 = x2
        x2 = x1
        C.f7786(x1)
        C.f7786(x2)
        C.g7786(x1)
        C.g7786(x2)

        var b1 *C.typedef_body7786
        var b2 *C.struct_body7786
        b1 = b2
        b2 = b1
        C.b7786(b1)
        C.b7786(b2)
        C.c7786(b1)
        C.c7786(b2)

        var u1 *C.typedef_union7786
        var u2 *C.union_union7786
        u1 = u2
        u2 = u1
        C.u7786(u1)
        C.u7786(u2)
        C.v7786(u1)
        C.v7786(u2)
}

// issue 8092

func test8092(t *testing.T) {
        tests := []struct {
                s    string
                a, b *C.char
        }{
                {"text", &C.text[0], C.ctext()},
                {"data", &C.data[0], C.cdata()},
        }
        for _, test := range tests {
                if test.a != test.b {
                        t.Errorf("%s: pointer mismatch: %v != %v", test.s, test.a, test.b)
                }
                if got := C.GoString(test.a); got != test.s {
                        t.Errorf("%s: points at %#v, want %#v", test.s, got, test.s)
                }
        }
}

// issues 8368 and 8441

func issue8368(one *C.struct_one, two *C.struct_two) {
}

func issue8441(one *C.one, two *C.two) {
        issue8441(two.x, one.x)
}

// issue 8428

var _ = C.struct_issue8428one{
        b: C.char(0),
        // The trailing rest field is not available in cgo.
        // See issue 11925.
        // rest: [0]C.char{},
}

var _ = C.struct_issue8428two{
        p:    unsafe.Pointer(nil),
        b:    C.char(0),
        rest: [0]C.char{},
}

var _ = C.struct_issue8428three{
        w: [1][2][3][0]C.char{},
        x: [2][3][0][1]C.char{},
        y: [3][0][1][2]C.char{},
        z: [0][1][2][3]C.char{},
}

// issue 8811

func test8811(t *testing.T) {
        C.issue8811Execute()
}

// issue 9557

func test9557(t *testing.T) {
        // implicitly dereference a Go variable
        foo := C.issue9557foo
        if v := foo.a; v != 42 {
                t.Fatalf("foo.a expected 42, but got %d", v)
        }

        // explicitly dereference a C variable
        if v := (*C.issue9557foo).a; v != 42 {
                t.Fatalf("(*C.issue9557foo).a expected 42, but is %d", v)
        }

        // implicitly dereference a C variable
        if v := C.issue9557foo.a; v != 42 {
                t.Fatalf("C.issue9557foo.a expected 42, but is %d", v)
        }
}

// issue 8331 part 1

func issue8331a() C.issue8331 {
        return issue8331Var
}

// issue 10303

func test10303(t *testing.T, n int) {
        if runtime.Compiler == "gccgo" {
                t.Skip("gccgo permits C pointers on the stack")
        }

        // Run at a few different stack depths just to avoid an unlucky pass
        // due to variables ending up on different pages.
        if n > 0 {
                test10303(t, n-1)
        }
        if t.Failed() {
                return
        }
        var x, y, z, v, si C.int
        var s C.Struct
        C.setintstar(&x)
        C.setintptr(&y)
        C.setvoidptr(unsafe.Pointer(&v))
        s.P = &si
        C.setstruct(s)

        if uintptr(unsafe.Pointer(&x))&^0xfff == uintptr(unsafe.Pointer(&z))&^0xfff {
                t.Error("C int* argument on stack")
        }
        if uintptr(unsafe.Pointer(&y))&^0xfff == uintptr(unsafe.Pointer(&z))&^0xfff {
                t.Error("C intptr argument on stack")
        }
        if uintptr(unsafe.Pointer(&v))&^0xfff == uintptr(unsafe.Pointer(&z))&^0xfff {
                t.Error("C void* argument on stack")
        }
        if uintptr(unsafe.Pointer(&si))&^0xfff == uintptr(unsafe.Pointer(&z))&^0xfff {
                t.Error("C struct field pointer on stack")
        }
}

// issue 11925

func test11925(t *testing.T) {
        if C.sizeof_struct_a11925 != unsafe.Sizeof(C.struct_a11925{}) {
                t.Errorf("size of a changed: C %d, Go %d", C.sizeof_struct_a11925, unsafe.Sizeof(C.struct_a11925{}))
        }
        if C.sizeof_struct_b11925 != unsafe.Sizeof(C.struct_b11925{}) {
                t.Errorf("size of b changed: C %d, Go %d", C.sizeof_struct_b11925, unsafe.Sizeof(C.struct_b11925{}))
        }
}

// issue 12030

func test12030(t *testing.T) {
        buf := (*C.char)(C.malloc(256))
        defer C.free(unsafe.Pointer(buf))
        for _, f := range []float64{1.0, 2.0, 3.14} {
                C.issue12030conv(buf, C.double(f))
                got := C.GoString(buf)
                if want := fmt.Sprintf("d=%g", f); got != want {
                        t.Fatalf("C.sprintf failed for %g: %q != %q", f, got, want)
                }
        }
}

// issue 13402

var _ C.complexfloat
var _ C.complexdouble

// issue 13930
// Test that cgo's multiple-value special form for
// C function calls works in variable declaration statements.

var _, _ = C.abs(0)

// issue 14838

func test14838(t *testing.T) {
        data := []byte{0, 1, 2, 3, 4, 5, 6, 7, 8, 9}
        cData := C.CBytes(data)
        defer C.free(cData)

        if C.check_cbytes((*C.char)(cData), C.size_t(len(data))) == 0 {
                t.Fatalf("mismatched data: expected %v, got %v", data, (*(*[10]byte)(unsafe.Pointer(cData)))[:])
        }
}

// issue 17065

var sink C.int

func test17065(t *testing.T) {
        if runtime.GOOS == "darwin" || runtime.GOOS == "ios" {
                t.Skip("broken on darwin; issue 17065")
        }
        for i := range C.ii {
                sink = C.ii[i]
        }
}

// issue 17537

func test17537(t *testing.T) {
        v := C.S17537{i: 17537}
        if got, want := C.I17537(&v), C.int(17537); got != want {
                t.Errorf("got %d, want %d", got, want)
        }

        p := (*C.char)(C.malloc(1))
        *p = 17
        if got, want := C.F17537(&p), C.int(17); got != want {
                t.Errorf("got %d, want %d", got, want)
        }

        C.F18298(nil)
        var v18298 C.T18298_2
        C.G18298(C.T18298_1(v18298))
}

// issue 17723

func testAPI() {
        var cs *C.char
        cs = C.CString("hello")
        defer C.free(unsafe.Pointer(cs))
        var s string
        s = C.GoString((*C.char)(C.api_hello))
        s = C.GoStringN((*C.char)(C.api_hello), C.int(6))
        var b []byte
        b = C.GoBytes(unsafe.Pointer(C.api_hello), C.int(6))
        _, _ = s, b
        C.cstring_pointer_fun(nil)
}

// issue 18126

func test18126(t *testing.T) {
        p := C.malloc(1)
        _, err := C.Issue18126C(&p)
        C.free(p)
        _ = err
}

// issue 18720

func test18720(t *testing.T) {
        if got, want := C.HELLO_WORLD, "hello\000world"; got != want {
                t.Errorf("C.HELLO_WORLD == %q, expected %q", got, want)
        }

        if got, want := C.VAR1, C.int(5); got != want {
                t.Errorf("C.VAR1 == %v, expected %v", got, want)
        }

        if got, want := *C.ADDR, C.int(5); got != want {
                t.Errorf("*C.ADDR == %v, expected %v", got, want)
        }

        if got, want := C.CALL, C.int(6); got != want {
                t.Errorf("C.CALL == %v, expected %v", got, want)
        }

        if got, want := C.CALL, C.int(7); got != want {
                t.Errorf("C.CALL == %v, expected %v", got, want)
        }

        // Issue 20125.
        if got, want := C.SIZE_OF_FOO, 1; got != want {
                t.Errorf("C.SIZE_OF_FOO == %v, expected %v", got, want)
        }
}

// issue 20129

func test20129(t *testing.T) {
        if C.issue20129 != 0 {
                t.Fatal("test is broken")
        }
        C.issue20129Foo()
        if C.issue20129 != 1 {
                t.Errorf("got %v but expected %v", C.issue20129, 1)
        }
        C.issue20129Bar()
        if C.issue20129 != 2 {
                t.Errorf("got %v but expected %v", C.issue20129, 2)
        }
}

// issue 20369

func test20369(t *testing.T) {
        if C.XUINT64_MAX != math.MaxUint64 {
                t.Fatalf("got %v, want %v", uint64(C.XUINT64_MAX), uint64(math.MaxUint64))
        }
}

// issue 21668

var issue21668_X = C.x21668

// issue 21708

func test21708(t *testing.T) {
        if got, want := C.CAST_TO_INT64, -1; got != want {
                t.Errorf("C.CAST_TO_INT64 == %v, expected %v", got, want)
        }
}

// issue 21809

func test21809(t *testing.T) {
        longVar := C.long(3)
        typedefVar := C.MySigned_t(4)
        typedefTypedefVar := C.MySigned2_t(5)

        // all three should be considered identical to `long`
        if ret := C.takes_long(longVar); ret != 9 {
                t.Errorf("got %v but expected %v", ret, 9)
        }
        if ret := C.takes_long(typedefVar); ret != 16 {
                t.Errorf("got %v but expected %v", ret, 16)
        }
        if ret := C.takes_long(typedefTypedefVar); ret != 25 {
                t.Errorf("got %v but expected %v", ret, 25)
        }

        // They should also be identical to the typedef'd type
        if ret := C.takes_typedef(longVar); ret != 9 {
                t.Errorf("got %v but expected %v", ret, 9)
        }
        if ret := C.takes_typedef(typedefVar); ret != 16 {
                t.Errorf("got %v but expected %v", ret, 16)
        }
        if ret := C.takes_typedef(typedefTypedefVar); ret != 25 {
                t.Errorf("got %v but expected %v", ret, 25)
        }
}

// issue 22906

func test22906(t *testing.T) {
        var x1 C.jobject = 0 // Note: 0, not nil. That makes sure we use uintptr for these types.
        _ = x1
        var x2 C.jclass = 0
        _ = x2
        var x3 C.jthrowable = 0
        _ = x3
        var x4 C.jstring = 0
        _ = x4
        var x5 C.jarray = 0
        _ = x5
        var x6 C.jbooleanArray = 0
        _ = x6
        var x7 C.jbyteArray = 0
        _ = x7
        var x8 C.jcharArray = 0
        _ = x8
        var x9 C.jshortArray = 0
        _ = x9
        var x10 C.jintArray = 0
        _ = x10
        var x11 C.jlongArray = 0
        _ = x11
        var x12 C.jfloatArray = 0
        _ = x12
        var x13 C.jdoubleArray = 0
        _ = x13
        var x14 C.jobjectArray = 0
        _ = x14
        var x15 C.jweak = 0
        _ = x15
}

// issue 22958
// Nothing to run, just make sure this compiles.
var Vissue22958 C.issue22958Type

func test23356(t *testing.T) {
        if got, want := C.a(), C.int(5); got != want {
                t.Errorf("C.a() == %v, expected %v", got, want)
        }
        if got, want := C.r(), C.int(3); got != want {
                t.Errorf("C.r() == %v, expected %v", got, want)
        }
}

// issue 23720

func Issue23720F() {
        var x C.issue23720A
        C.issue23720F(x)
}

// issue 24206

func test24206(t *testing.T) {
        if runtime.GOOS != "linux" || runtime.GOARCH != "amd64" {
                t.Skipf("skipping on %s/%s", runtime.GOOS, runtime.GOARCH)
        }

        if l := len(C.GoString(C.dangerousString1())); l != 123 {
                t.Errorf("Incorrect string length - got %d, want 123", l)
        }
        if l := len(C.GoString(C.dangerousString2())); l != 4096+123 {
                t.Errorf("Incorrect string length - got %d, want %d", l, 4096+123)
        }
}

// issue 25143

func issue25143sum(ns ...C.int) C.int {
        total := C.int(0)
        for _, n := range ns {
                total += n
        }
        return total
}

func test25143(t *testing.T) {
        if got, want := issue25143sum(1, 2, 3), C.int(6); got != want {
                t.Errorf("issue25143sum(1, 2, 3) == %v, expected %v", got, want)
        }
}

// issue 26066
// Wrong type of constant with GCC 8 and newer.

func test26066(t *testing.T) {
        var i = int64(C.issue26066)
        if i != -1 {
                t.Errorf("got %d, want -1", i)
        }
}

// issue 26517
var a C.TypeOne
var b C.TypeTwo

// issue 27660
// Stress the interaction between the race detector and cgo in an
// attempt to reproduce the memory corruption described in #27660.
// The bug was very timing sensitive; at the time of writing this
// test would only trigger the bug about once out of every five runs.

func test27660(t *testing.T) {
        ctx, cancel := context.WithCancel(context.Background())
        defer cancel()
        ints := make([]int, 100)
        locks := make([]sync.Mutex, 100)
        // Slowly create threads so that ThreadSanitizer is forced to
        // frequently resize its SyncClocks.
        for i := 0; i < 100; i++ {
                go func() {
                        for ctx.Err() == nil {
                                // Sleep in C for long enough that it is likely that the runtime
                                // will retake this goroutine's currently wired P.
                                C.usleep(1000 /* 1ms */)
                                runtime.Gosched() // avoid starvation (see #28701)
                        }
                }()
                go func() {
                        // Trigger lots of synchronization and memory reads/writes to
                        // increase the likelihood that the race described in #27660
                        // results in corruption of ThreadSanitizer's internal state
                        // and thus an assertion failure or segfault.
                        i := 0
                        for ctx.Err() == nil {
                                j := rand.Intn(100)
                                locks[j].Lock()
                                ints[j]++
                                locks[j].Unlock()
                                // needed for gccgo, to avoid creation of an
                                // unpreemptible "fast path" in this loop. Choice
                                // of (1<<24) is somewhat arbitrary.
                                if i%(1<<24) == 0 {
                                        runtime.Gosched()
                                }
                                i++

                        }
                }()
                time.Sleep(time.Millisecond)
        }
}

// issue 28540

func twoargsF() {
        var v struct{ p *byte }
        C.twoargs1(C.twoargs2(), C.twoargs3(unsafe.Pointer(&v)))
}

// issue 28545

func issue28545G(p **C.char) {
        C.issue28545F(p, -1, (0))
        C.issue28545F(p, 2+3, complex(1, 1))
        C.issue28545F(p, issue28772Constant, issue28772Constant2)
}

// issue 28772 part 1 - part 2 in testx.go

const issue28772Constant = C.issue28772Constant

// issue 28896

func offset(i int) uintptr {
        var pi C.innerPacked
        var po C.outerPacked
        var ui C.innerUnpacked
        var uo C.outerUnpacked
        switch i {
        case 0:
                return unsafe.Offsetof(pi.f2)
        case 1:
                return unsafe.Offsetof(po.g2)
        case 2:
                return unsafe.Offsetof(ui.f2)
        case 3:
                return unsafe.Offsetof(uo.g2)
        default:
                panic("can't happen")
        }
}

func test28896(t *testing.T) {
        for i := 0; i < 4; i++ {
                c := uintptr(C.offset(C.int(i)))
                g := offset(i)
                if c != g {
                        t.Errorf("%d: C: %d != Go %d", i, c, g)
                }
        }
}

// issue 29383
// cgo's /*line*/ comments failed when inserted after '/',
// because the result looked like a "//" comment.
// No runtime test; just make sure it compiles.

func Issue29383(n, size uint) int {
        if ^C.size_t(0)/C.size_t(n) < C.size_t(size) {
                return 0
        }
        return 0
}

// issue 29748
// Error handling a struct initializer that requires pointer checking.
// Compilation test only, nothing to run.

var Vissue29748 = C.f29748(&C.S29748{
        nil,
})

func Fissue299748() {
        C.f29748(&C.S29748{
                nil,
        })
}

// issue 29781

var issue29781X struct{ X int }

func issue29781F(...int) int { return 0 }

func issue29781G() {
        var p *C.char
        C.issue29781F(&p, C.ISSUE29781C+1)
        C.issue29781F(nil, (C.int)(
                0))
        C.issue29781F(&p, (C.int)(0))
        C.issue29781F(&p, (C.int)(
                0))
        C.issue29781F(&p, (C.int)(issue29781X.
                X))
}

// issue 30065

func test30065(t *testing.T) {
        var a [256]byte
        b := []byte("a")
        C.memcpy(unsafe.Pointer(&a), unsafe.Pointer(&b[0]), 1)
        if a[0] != 'a' {
                t.Errorf("&a failed: got %c, want %c", a[0], 'a')
        }

        b = []byte("b")
        C.memcpy(unsafe.Pointer(&a[0]), unsafe.Pointer(&b[0]), 1)
        if a[0] != 'b' {
                t.Errorf("&a[0] failed: got %c, want %c", a[0], 'b')
        }

        d := make([]byte, 256)
        b = []byte("c")
        C.memcpy(unsafe.Pointer(&d[0]), unsafe.Pointer(&b[0]), 1)
        if d[0] != 'c' {
                t.Errorf("&d[0] failed: got %c, want %c", d[0], 'c')
        }
}

// issue 31093
// No runtime test; just make sure it compiles.

func Issue31093() {
        C.issue31093F(C.ushort(0))
}

// issue 32579

func test32579(t *testing.T) {
        var s [1]C.struct_S32579
        C.memset(unsafe.Pointer(&s[0].data[0]), 1, 1)
        if s[0].data[0] != 1 {
                t.Errorf("&s[0].data[0] failed: got %d, want %d", s[0].data[0], 1)
        }
}

// issue 37033, check if cgo.Handle works properly

func testHandle(t *testing.T) {
        ch := make(chan int)

        for i := 0; i < 42; i++ {
                h := cgo.NewHandle(ch)
                go func() {
                        C.cFunc37033(C.uintptr_t(h))
                }()
                if v := <-ch; issue37033 != v {
                        t.Fatalf("unexpected receiving value: got %d, want %d", v, issue37033)
                }
                h.Delete()
        }
}

// issue 38649

var issue38649 C.netbsd_gid = 42

// issue 39877

var issue39877 *C.void = nil

// issue 40494
// No runtime test; just make sure it compiles.

func Issue40494() {
        C.issue40494(C.enum_Enum40494(C.X_40494), (*C.union_Union40494)(nil))
}

// Issue 45451.
func test45451(t *testing.T) {
        var u *C.issue45451
        typ := reflect.ValueOf(u).Type().Elem()

        // The type is undefined in C so allocating it should panic.
        defer func() {
                if r := recover(); r == nil {
                        t.Error("expected panic")
                }
        }()

        _ = reflect.New(typ)
        t.Errorf("reflect.New(%v) should have panicked", typ)
}

// issue 52542

func func52542[T ~[]C.int]() {}

type type52542[T ~*C.float] struct{}