github.com/ice-blockchain/go/src@v0.0.0-20240403114104-1564d284e521/runtime/cgo/libcgo.h (about)

     1  // Copyright 2009 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  #include <stdint.h>
     6  #include <stdlib.h>
     7  #include <stdio.h>
     8  
     9  #undef nil
    10  #define nil ((void*)0)
    11  #define nelem(x) (sizeof(x)/sizeof((x)[0]))
    12  
    13  typedef uint32_t uint32;
    14  typedef uint64_t uint64;
    15  typedef uintptr_t uintptr;
    16  
    17  /*
    18   * The beginning of the per-goroutine structure,
    19   * as defined in ../pkg/runtime/runtime.h.
    20   * Just enough to edit these two fields.
    21   */
    22  typedef struct G G;
    23  struct G
    24  {
    25  	uintptr stacklo;
    26  	uintptr stackhi;
    27  };
    28  
    29  /*
    30   * Arguments to the _cgo_thread_start call.
    31   * Also known to ../pkg/runtime/runtime.h.
    32   */
    33  typedef struct ThreadStart ThreadStart;
    34  struct ThreadStart
    35  {
    36  	G *g;
    37  	uintptr *tls;
    38  	void (*fn)(void);
    39  };
    40  
    41  /*
    42   * Called by 5c/6c/8c world.
    43   * Makes a local copy of the ThreadStart and
    44   * calls _cgo_sys_thread_start(ts).
    45   */
    46  extern void (*_cgo_thread_start)(ThreadStart *ts);
    47  
    48  /*
    49   * Creates a new operating system thread without updating any Go state
    50   * (OS dependent).
    51   */
    52  extern void (*_cgo_sys_thread_create)(void* (*func)(void*), void* arg);
    53  
    54  /*
    55   * Indicates whether a dummy pthread per-thread variable is allocated.
    56   */
    57  extern uintptr_t *_cgo_pthread_key_created;
    58  
    59  /*
    60   * Creates the new operating system thread (OS, arch dependent).
    61   */
    62  void _cgo_sys_thread_start(ThreadStart *ts);
    63  
    64  /*
    65   * Waits for the Go runtime to be initialized (OS dependent).
    66   * If runtime.SetCgoTraceback is used to set a context function,
    67   * calls the context function and returns the context value.
    68   */
    69  uintptr_t _cgo_wait_runtime_init_done(void);
    70  
    71  /*
    72   * Get the low and high boundaries of the stack.
    73   */
    74  void x_cgo_getstackbound(uintptr bounds[2]);
    75  
    76  /*
    77   * Prints error then calls abort. For linux and android.
    78   */
    79  void fatalf(const char* format, ...) __attribute__ ((noreturn));
    80  
    81  /*
    82   * Registers the current mach thread port for EXC_BAD_ACCESS processing.
    83   */
    84  void darwin_arm_init_thread_exception_port(void);
    85  
    86  /*
    87   * Starts a mach message server processing EXC_BAD_ACCESS.
    88   */
    89  void darwin_arm_init_mach_exception_handler(void);
    90  
    91  /*
    92   * The cgo context function. See runtime.SetCgoTraceback.
    93   */
    94  struct context_arg {
    95  	uintptr_t Context;
    96  };
    97  extern void (*(_cgo_get_context_function(void)))(struct context_arg*);
    98  
    99  /*
   100   * The argument for the cgo traceback callback. See runtime.SetCgoTraceback.
   101   */
   102  struct cgoTracebackArg {
   103  	uintptr_t  Context;
   104  	uintptr_t  SigContext;
   105  	uintptr_t* Buf;
   106  	uintptr_t  Max;
   107  };
   108  
   109  /*
   110   * TSAN support.  This is only useful when building with
   111   *   CGO_CFLAGS="-fsanitize=thread" CGO_LDFLAGS="-fsanitize=thread" go install
   112   */
   113  #undef CGO_TSAN
   114  #if defined(__has_feature)
   115  # if __has_feature(thread_sanitizer)
   116  #  define CGO_TSAN
   117  # endif
   118  #elif defined(__SANITIZE_THREAD__)
   119  # define CGO_TSAN
   120  #endif
   121  
   122  #ifdef CGO_TSAN
   123  
   124  // These must match the definitions in yesTsanProlog in cmd/cgo/out.go.
   125  // In general we should call _cgo_tsan_acquire when we enter C code,
   126  // and call _cgo_tsan_release when we return to Go code.
   127  // This is only necessary when calling code that might be instrumented
   128  // by TSAN, which mostly means system library calls that TSAN intercepts.
   129  // See the comment in cmd/cgo/out.go for more details.
   130  
   131  long long _cgo_sync __attribute__ ((common));
   132  
   133  extern void __tsan_acquire(void*);
   134  extern void __tsan_release(void*);
   135  
   136  __attribute__ ((unused))
   137  static void _cgo_tsan_acquire() {
   138  	__tsan_acquire(&_cgo_sync);
   139  }
   140  
   141  __attribute__ ((unused))
   142  static void _cgo_tsan_release() {
   143  	__tsan_release(&_cgo_sync);
   144  }
   145  
   146  #else // !defined(CGO_TSAN)
   147  
   148  #define _cgo_tsan_acquire()
   149  #define _cgo_tsan_release()
   150  
   151  #endif // !defined(CGO_TSAN)