初步实现异常捕获机制

soft/exception.c

@@ -0,0 +1,97 @@
+
+
+#include "setjmp.h"
+#include "stdio.h"
+#include "stdlib.h"
+#include "unistd.h"
+#include "string.h"
+#include "stdarg.h"
+#include "exception.h"
+#include "mystdlib.h"
+
+
+
+exception_def *exception(){
+  static exception_def frame={0};
+  return &frame;
+}
+
+
+
+
+
+void __throw(char *file,int line,const char *fmt,...){
+  exception_def *f=exception();
+  jmp_fram *h=f->jmp_head;
+  char *buff=0;
+  int length=0;
+  va_list args;
+  f->file=file;
+  f->line=line;
+  buff=f->log;
+  va_start(args, fmt);
+  length += vsnprintf(buff + length, THROW_LOG__MAX_SIZE - length - 1, fmt, args);
+  va_end(args);
+  longjmp((h->fram),1);
+}
+
+
+
+
+char *err_(){
+  exception_def *f=exception();
+  return f->log;
+}
+char *file_(){
+  exception_def *f=exception();
+  return f->file;
+}
+int line_(){
+  exception_def *f=exception();
+  return f->line;
+}
+void func_two();
+
+int test_add(int a, int b)
+{
+  printf("setjmp test.\n");
+  try_{
+    printf("first enter setjmp.\n");
+
+    try_{
+      printf("try in try.\n");
+      func_two();
+      // throw_("throw two err.");
+    }catch_{
+      printf("file=%s,line=%d,err=%s.\n",file_(),line_(),err_());
+    }
+    throw_("throw a err.");
+
+  }catch_{
+    printf("sssss\n");
+    printf("file=%s,line=%d,err=%s.\n",file_(),line_(),err_());
+    try_{
+      printf("try in catch.\n");
+      func_two();
+      // throw_("throw two err.");
+    }catch_{
+      printf("file=%s,line=%d,err=%s.\n",file_(),line_(),err_());
+    }
+  }
+  printf("setjmp end.\n");
+  return 0;
+}
+
+
+
+
+
+void func_two(){
+  printf("in func:%s\n",__func__);
+  void *p=mem_malloc(512);
+  throw_("throw in func_two. in func:%s",__func__);
+  mem_free(p);
+}
+
+
+