1 // Copyright 2016 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 main 6 7 // This program will crash. 8 // We want the stack trace to include the C functions. 9 // We use a fake traceback, and a symbolizer that dumps a string we recognize. 10 11 /* 12 #cgo CFLAGS: -g -O0 13 14 #include <stdint.h> 15 16 char *p; 17 18 static int f3(void) { 19 *p = 0; 20 return 0; 21 } 22 23 static int f2(void) { 24 return f3(); 25 } 26 27 static int f1(void) { 28 return f2(); 29 } 30 31 struct cgoTracebackArg { 32 uintptr_t context; 33 uintptr_t sigContext; 34 uintptr_t* buf; 35 uintptr_t max; 36 }; 37 38 struct cgoSymbolizerArg { 39 uintptr_t pc; 40 const char* file; 41 uintptr_t lineno; 42 const char* func; 43 uintptr_t entry; 44 uintptr_t more; 45 uintptr_t data; 46 }; 47 48 void cgoTraceback(void* parg) { 49 struct cgoTracebackArg* arg = (struct cgoTracebackArg*)(parg); 50 arg->buf[0] = 1; 51 arg->buf[1] = 2; 52 arg->buf[2] = 3; 53 arg->buf[3] = 0; 54 } 55 56 void cgoSymbolizer(void* parg) { 57 struct cgoSymbolizerArg* arg = (struct cgoSymbolizerArg*)(parg); 58 if (arg->pc != arg->data + 1) { 59 arg->file = "unexpected data"; 60 } else { 61 arg->file = "cgo symbolizer"; 62 } 63 arg->lineno = arg->data + 1; 64 arg->data++; 65 } 66 */ 67 import "C" 68 69 import ( 70 "runtime" 71 "unsafe" 72 ) 73 74 func init() { 75 register("CrashTraceback", CrashTraceback) 76 } 77 78 func CrashTraceback() { 79 runtime.SetCgoTraceback(0, unsafe.Pointer(C.cgoTraceback), nil, unsafe.Pointer(C.cgoSymbolizer)) 80 C.f1() 81 } 82
