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+//{{{  Banner                                           
+
+//============================================================================
+//
+//      assert.cxx
+//
+//      Host side implementation of the infrastructure assertions.
+//
+//============================================================================
+//####COPYRIGHTBEGIN####
+//                                                                          
+// ----------------------------------------------------------------------------
+// Copyright (C) 1998, 1999, 2000 Red Hat, Inc.
+//
+// This file is part of the eCos host tools.
+//
+// This program is free software; you can redistribute it and/or modify it 
+// under the terms of the GNU General Public License as published by the Free 
+// Software Foundation; either version 2 of the License, or (at your option) 
+// any later version.
+// 
+// This program is distributed in the hope that it will be useful, but WITHOUT 
+// ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or 
+// FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License for 
+// more details.
+// 
+// You should have received a copy of the GNU General Public License along with
+// this program; if not, write to the Free Software Foundation, Inc., 
+// 59 Temple Place - Suite 330, Boston, MA  02111-1307, USA.
+//
+// ----------------------------------------------------------------------------
+//                                                                          
+//####COPYRIGHTEND####
+//============================================================================
+//#####DESCRIPTIONBEGIN####
+//
+// Author(s):   bartv
+// Contact(s):  bartv
+// Date:        1998/11/27
+// Version:     0.01
+// Purpose:     To provide a host-side implementation of the eCos assertion
+//              facilities.
+//
+//####DESCRIPTIONEND####
+//============================================================================
+
+//}}}
+//{{{  #include's                                       
+
+#include "pkgconf/infra.h"
+#include "cyg/infra/cyg_type.h"
+// Without this symbol the header file has no effect
+#define CYGDBG_USE_TRACING
+// Make sure that the host-side extensions get prototyped
+// as well.
+#define CYG_DECLARE_HOST_ASSERTION_SUPPORT
+#include "cyg/infra/cyg_ass.h"
+
+// STDIO is needed for the default assertion handler.
+// STDLIB is needed for exit() and the status codes.
+#include <cstdio>
+#include <cstdlib>
+
+// These are needed for the table of callbacks.
+#include <utility>
+#include <iterator>
+#include <vector>
+
+//}}}
+
+// -------------------------------------------------------------------------
+// Statics. The host-side assertion code requires two bits of data.
+//
+// The first identifies the function that should actually get invoked
+// when an assertion is triggered. A default implementation is defined
+// in this module, but applications may install a replacement.
+//
+// The second is a table of callback functions that various libraries
+// or bits of application code may install. Each such callback gets invoked
+// when an assertion triggers.
+
+// VC++ bogosity. Using a full function pointer prototype in a template
+// confuses the compiler. It is still possible to declare the callbacks vector,
+// but not any iterators for that vector. A typedef makes the problem go
+// away.
+typedef void (*cyg_callback_fn)(void (*)(const char*));
+
+                                        // The current assertion handler
+static bool (*current_handler)( const char*, const char*, cyg_uint32, const char*) = 0;
+
+                                        // The callback table.
+static std::vector<std::pair<const char*, cyg_callback_fn> > callbacks;
+
+// ----------------------------------------------------------------------------
+// Many applications will want to handle assertion failures differently
+// from the default, for example pipe the output into an emacs buffer
+// rather than just generate a file. This routine allows a suitable
+// function to be installed.
+
+extern "C" void
+cyg_assert_install_failure_handler( bool(*fn)(const char*, const char*, cyg_uint32, const char*) )
+{
+    current_handler = fn;
+}
+
+// ----------------------------------------------------------------------------
+// Various different bits of the system may want to register callback functions
+// that get invoked during an assertion failure and that output useful
+// data. Typically this might happen in the constructor for a static object.
+// A good example of such a callback is the implementation of the trace code.
+//
+// The implementation requires creating a new entry in the static vector.
+// A memory exhaustion exception could occur but there is no sensible way of
+// handling it at this level.
+//
+// Multiple callbacks with the same name are legal. Multiple callbacks with
+// the same function are unlikely, but it is probably not worthwhile raising
+// an exception (especially since this code may be called from C).
+extern "C" void
+cyg_assert_install_failure_callback( const char* name, void (*fn)(void (*)(const char*)) )
+{
+    callbacks.push_back(std::make_pair(name, fn));
+}
+
+// -------------------------------------------------------------------------
+// Once an assertion has triggered either the default handler or the
+// installed handler will want to invoke all the callbacks. Rather than
+// provide direct access to the callback table and require the calling
+// code to be in C++, a functional interface is provided instead.
+extern "C" void
+cyg_assert_failure_invoke_callbacks(
+    void (*first_fn)(const char*),
+    void (*data_fn)(const char*),
+    void (*final_fn)(void) )
+{
+    std::vector<std::pair<const char*, cyg_callback_fn> >::const_iterator i;
+
+    for ( i = callbacks.begin(); i != callbacks.end(); i++ ) {
+
+        if (0 != first_fn) {
+            (*first_fn)(i->first);
+        }
+        if (0 != data_fn) {
+            (*(i->second))(data_fn);
+        }
+        if (0 != final_fn) {
+            (*final_fn)();
+        }
+    }
+}
+
+// ----------------------------------------------------------------------------
+// The default assertion handler. This assumes that the application is 
+// a console application with a sensible stderr stream.
+//
+// First some initial diagnostics are output immediately, in case
+// subsequent attempts to output more data cause additional failures. It
+// is worthwhile detecting recursive assertion failures.
+//
+// Assuming the table of callbacks is not empty it is possible to output
+// some more data to a file. The tmpnam() function is used to get a filename.
+// The file is opened and the callbacks are invoked. Three utilities have to
+// be provided to do the real work, and a static is used to keep track of the
+// FILE * pointer.
+//
+// The testcase tassert8, and in particular the associated Tcl proc
+// tassert8_filter in testsuite/cyginfra/assert.exp, has detailed
+// knowledge of the output format. Any changes here may need to be
+// reflected in that test case. There are also support routines in
+// hosttest.exp which may need to be updated.
+
+static FILE * default_handler_output_file = 0;
+static bool   body_contains_data          = false;
+
+                                        // output the callback name
+static void
+default_handler_first_fn(const char* name)
+{
+    if (0 != default_handler_output_file) {
+        fprintf(default_handler_output_file, "# {{{  %s\n\n", name);
+    }
+    body_contains_data = false;
+}
+
+                                        // output some actual text.
+static void
+default_handler_second_fn(const char* data)
+{
+    body_contains_data = true;
+    if (0 != default_handler_output_file) {
+        fputs(data, default_handler_output_file);
+    }
+}
+
+                                        // the end of a callback.
+static void
+default_handler_final_fn( void )
+{
+    
+    if (0 != default_handler_output_file) {
+        if (body_contains_data) {
+            fputs("\n", default_handler_output_file);
+        }
+        fputs("# }}}\n", default_handler_output_file);
+    }
+}
+
+
+static void
+default_handler(const char* fn, const char* file, cyg_uint32 lineno, const char* msg)
+{
+    static int invoke_count = 0;
+    if (2 == invoke_count) {
+        // The fprintf() immediately below causes an assertion failure
+    } else if (1 == invoke_count) {
+        invoke_count++;
+        fprintf(stderr, "Recursive assertion failure.\n");
+        return;
+    } else {
+        invoke_count = 1;
+    }
+    
+    // There is an argument for using write() rather than fprintf() here,
+    // in case the C library has been corrupted. For now this has not been
+    // attempted.
+    if (0 == msg)
+        msg ="<unknown>";
+    if (0 == file)
+        file = "<unknown>";
+    
+    fprintf(stderr, "Assertion failure: %s\n", msg);
+    fprintf(stderr, "File %s, line number %lu\n", file, (unsigned long) lineno);
+    if (0 != fn)
+        fprintf(stderr, "Function %s\n", fn);
+    
+    // Only create a logfile if more information is available.
+    if (0 != callbacks.size() ) {
+        char filename[L_tmpnam];
+        if (0 == tmpnam(filename)) {
+            fprintf(stderr, "Unable to create a suitable output file for additional data.\n");
+        } else {
+
+            // No attempt is made to ensure that the file does not already
+            // exist. This would require POSIX calls rather than ISO C ones.
+            // The probability of a problem is considered to be too small
+            // to worry about.
+            default_handler_output_file = fopen(filename, "w");
+            if (0 == default_handler_output_file) {
+                fprintf(stderr, "Unable to open output file %s\n", filename);
+                fputs("No further assertion information is available.\n", stderr);
+            } else {
+                fprintf(stderr, "Writing additional output to %s\n", filename);
+                
+                // Repeat the information about the assertion itself.
+                fprintf(default_handler_output_file, "Assertion failure: %s\n", msg);
+                fprintf(default_handler_output_file, "File %s, line number %lu\n", file, (unsigned long) lineno);
+                if (0 != fn)
+                    fprintf(default_handler_output_file, "Function %s\n", fn);
+                fputs("\n", default_handler_output_file);
+
+                // Now for the various callbacks.
+                cyg_assert_failure_invoke_callbacks( &default_handler_first_fn,
+                    &default_handler_second_fn, &default_handler_final_fn );
+
+                // And close the file.
+                fputs("\nEnd of assertion data.\n", default_handler_output_file);
+                fclose(default_handler_output_file);
+            }
+        }
+    }
+    fflush(stderr);
+}
+
+// ----------------------------------------------------------------------------
+// The assertion handler. This is the function that gets invoked when
+// an assertion triggers. If a special assertion handler has been installed
+// then this gets called. If it returns false or if no special handler is
+// available then the default handler gets called instead. Typically the
+// user will now have a lot of information about what happened to cause the
+// assertion failure. The next stage is to invoke abort() which should
+// terminate the program and generate a core dump for subsequent inspection
+// (unless of course the application is already running in a debugger session).
+// A final call to _exit() should be completely redundant.
+
+extern "C" void
+cyg_assert_fail( const char* fn, const char* file, cyg_uint32 lineno, const char* msg )
+{
+
+    if ((0 == current_handler) || !(*current_handler)(fn, file, lineno, msg)) {
+        default_handler(fn, file, lineno, msg);
+    }
+    abort();
+    _exit(0);
+}
+
+// ----------------------------------------------------------------------------
+// A utility function, primarily intended to be called from inside gdb.
+extern "C" void
+cyg_assert_quickfail(void)
+{
+    cyg_assert_fail("gdb", "<no file>", 0, "manual call");
+}