Add modified libbacktrace.

https://github.com/ianlancetaylor/libbacktrace 5a99ff7fed66b8ea8f09c9805c138524a7035ece
2025-03-20 07:40:02 +08:00 · 2019-01-20 16:53:45 +01:00
parent d4e9baa0d9
commit 0ce3dfaba7
12 changed files with 7555 additions and 0 deletions
@@ -0,0 +1,189 @@
+/* fileline.c -- Get file and line number information in a backtrace.
+   Copyright (C) 2012-2018 Free Software Foundation, Inc.
+   Written by Ian Lance Taylor, Google.
+
+Redistribution and use in source and binary forms, with or without
+modification, are permitted provided that the following conditions are
+met:
+
+    (1) Redistributions of source code must retain the above copyright
+    notice, this list of conditions and the following disclaimer.
+
+    (2) Redistributions in binary form must reproduce the above copyright
+    notice, this list of conditions and the following disclaimer in
+    the documentation and/or other materials provided with the
+    distribution.
+
+    (3) The name of the author may not be used to
+    endorse or promote products derived from this software without
+    specific prior written permission.
+
+THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR
+IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED
+WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
+DISCLAIMED. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT,
+INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES
+(INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR
+SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
+HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT,
+STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING
+IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
+POSSIBILITY OF SUCH DAMAGE.  */
+
+#include "config.h"
+
+#include <sys/types.h>
+#include <sys/stat.h>
+#include <errno.h>
+#include <fcntl.h>
+#include <stdlib.h>
+#include <unistd.h>
+
+#include "backtrace.hpp"
+#include "internal.hpp"
+
+#ifndef HAVE_GETEXECNAME
+#define getexecname() NULL
+#endif
+
+namespace tracy
+{
+
+/* Initialize the fileline information from the executable.  Returns 1
+   on success, 0 on failure.  */
+
+static int
+fileline_initialize (struct backtrace_state *state,
+		     backtrace_error_callback error_callback, void *data)
+{
+  int failed;
+  fileline fileline_fn;
+  int pass;
+  int called_error_callback;
+  int descriptor;
+  const char *filename;
+  char buf[64];
+
+  failed = state->fileline_initialization_failed;
+
+  if (failed)
+    {
+      error_callback (data, "failed to read executable information", -1);
+      return 0;
+    }
+
+  fileline_fn = state->fileline_fn;
+  if (fileline_fn != NULL)
+    return 1;
+
+  /* We have not initialized the information.  Do it now.  */
+
+  descriptor = -1;
+  called_error_callback = 0;
+  for (pass = 0; pass < 5; ++pass)
+    {
+      int does_not_exist;
+
+      switch (pass)
+	{
+	case 0:
+	  filename = state->filename;
+	  break;
+	case 1:
+	  filename = getexecname ();
+	  break;
+	case 2:
+	  filename = "/proc/self/exe";
+	  break;
+	case 3:
+	  filename = "/proc/curproc/file";
+	  break;
+	case 4:
+	  snprintf (buf, sizeof (buf), "/proc/%ld/object/a.out",
+		    (long) getpid ());
+	  filename = buf;
+	  break;
+	default:
+	  abort ();
+	}
+
+      if (filename == NULL)
+	continue;
+
+      descriptor = backtrace_open (filename, error_callback, data,
+				   &does_not_exist);
+      if (descriptor < 0 && !does_not_exist)
+	{
+	  called_error_callback = 1;
+	  break;
+	}
+      if (descriptor >= 0)
+	break;
+    }
+
+  if (descriptor < 0)
+    {
+      if (!called_error_callback)
+	{
+	  if (state->filename != NULL)
+	    error_callback (data, state->filename, ENOENT);
+	  else
+	    error_callback (data,
+			    "libbacktrace could not find executable to open",
+			    0);
+	}
+      failed = 1;
+    }
+
+  if (!failed)
+    {
+      if (!backtrace_initialize (state, filename, descriptor, error_callback,
+				 data, &fileline_fn))
+	failed = 1;
+    }
+
+  if (failed)
+  {
+    state->fileline_initialization_failed = 1;
+    return 0;
+  }
+
+  state->fileline_fn = fileline_fn;
+
+  return 1;
+}
+
+/* Given a PC, find the file name, line number, and function name.  */
+
+int
+backtrace_pcinfo (struct backtrace_state *state, uintptr_t pc,
+		  backtrace_full_callback callback,
+		  backtrace_error_callback error_callback, void *data)
+{
+  if (!fileline_initialize (state, error_callback, data))
+    return 0;
+
+  if (state->fileline_initialization_failed)
+    return 0;
+
+  return state->fileline_fn (state, pc, callback, error_callback, data);
+}
+
+/* Given a PC, find the symbol for it, and its value.  */
+
+int
+backtrace_syminfo (struct backtrace_state *state, uintptr_t pc,
+		   backtrace_syminfo_callback callback,
+		   backtrace_error_callback error_callback, void *data)
+{
+  if (!fileline_initialize (state, error_callback, data))
+    return 0;
+
+  if (state->fileline_initialization_failed)
+    return 0;
+
+  state->syminfo_fn (state, pc, callback, error_callback, data);
+  return 1;
+}
+
+}