[Assorted-commits] SF.net SVN: assorted:[1062] sandbox/trunk/src/nix

[<yan...@us...>]

Revision: 1062
          http://assorted.svn.sourceforge.net/assorted/?rev=1062&view=rev
Author:   yangzhang
Date:     2008-11-06 09:16:47 +0000 (Thu, 06 Nov 2008)

Log Message:
-----------
added the btmalloc debugging tool

Added Paths:
-----------
    sandbox/trunk/src/nix/btmalloc/
    sandbox/trunk/src/nix/btmalloc/backtrace.h
    sandbox/trunk/src/nix/btmalloc/btmalloc.c
    sandbox/trunk/src/nix/btmalloc/run.bash
    sandbox/trunk/src/nix/btmalloc/test.cc

Added: sandbox/trunk/src/nix/btmalloc/backtrace.h
===================================================================
--- sandbox/trunk/src/nix/btmalloc/backtrace.h	                        (rev 0)
+++ sandbox/trunk/src/nix/btmalloc/backtrace.h	2008-11-06 09:16:47 UTC (rev 1062)
@@ -0,0 +1,65 @@
+#define _GNU_SOURCE
+#include <stdio.h>
+#include <stdlib.h>
+#include <dlfcn.h>
+#include <execinfo.h>
+#include <signal.h>
+#include <bfd.h>
+#include <unistd.h>
+
+#define MAX_FRAMES (20)
+
+/* globals retained across calls to resolve. */
+static bfd* abfd = 0;
+static asymbol **syms = 0;
+static asection *text = 0;
+
+static void resolve(char *address) {
+  if (!abfd) {
+    char ename[1024];
+    int l = readlink("/proc/self/exe",ename,sizeof(ename));
+    if (l == -1) {
+      perror("failed to find executable\n");
+      return;
+    }
+    ename[l] = 0;
+
+    bfd_init();
+
+    abfd = bfd_openr(ename, 0);
+    if (!abfd) {
+      perror("bfd_openr failed: ");
+      return;
+    }
+    /* oddly, this is required for it to work... */
+    bfd_check_format(abfd,bfd_object);
+
+    unsigned storage_needed = bfd_get_symtab_upper_bound(abfd);
+    syms = (asymbol **) malloc(storage_needed);
+
+    text = bfd_get_section_by_name(abfd, ".text");
+  }
+  long offset = ((long)address) - text->vma;
+  if (offset > 0) {
+    const char *file;
+    const char *func;
+    unsigned line;
+    if (bfd_find_nearest_line(abfd, text, syms, offset, &file, &func, &line) && file)
+      printf("file: %s, line: %u, func %s\n",file,line,func);
+  }
+}
+
+static void print_trace() {
+  void *array[MAX_FRAMES];
+  size_t size;
+  size_t i;
+  void *approx_text_end = (void*) ((128+100) * 2<<20);
+
+  size = backtrace (array, MAX_FRAMES);
+  printf ("Obtained %zd stack frames.\n", size);
+  for (i = 0; i < size; i++) {
+    if (array[i] < approx_text_end) {
+      resolve(array[i]);
+    }
+  }
+}

Copied: sandbox/trunk/src/nix/btmalloc/btmalloc.c (from rev 1061, sandbox/trunk/src/nix/preload/interposer.c)
===================================================================
--- sandbox/trunk/src/nix/btmalloc/btmalloc.c	                        (rev 0)
+++ sandbox/trunk/src/nix/btmalloc/btmalloc.c	2008-11-06 09:16:47 UTC (rev 1062)
@@ -0,0 +1,24 @@
+#include "backtrace.c"
+
+#define _GNU_SOURCE
+#include <stdio.h>
+#include <dlfcn.h>
+
+void *
+malloc(size_t sz)
+{
+  // Find and cache the next malloc (in our example it should be the "real"
+  // malloc).
+  static void * (*func)();
+  if (!func)
+    func = (void *(*)()) dlsym(RTLD_NEXT, "malloc");
+
+  void *p = func(sz);
+
+  if (!p) {
+    printf("malloc failed!\n");
+    print_trace();
+  }
+
+  return p;
+}

Added: sandbox/trunk/src/nix/btmalloc/run.bash
===================================================================
--- sandbox/trunk/src/nix/btmalloc/run.bash	                        (rev 0)
+++ sandbox/trunk/src/nix/btmalloc/run.bash	2008-11-06 09:16:47 UTC (rev 1062)
@@ -0,0 +1,3 @@
+g++ -Wall -g3 -o test test.cc
+gcc -Wall -lbfd -ldl -fPIC -shared -o btmalloc.so btmalloc.c #backtrace.c
+LD_PRELOAD=./btmalloc.so ./test


Property changes on: sandbox/trunk/src/nix/btmalloc/run.bash
___________________________________________________________________
Added: svn:executable
   + *

Added: sandbox/trunk/src/nix/btmalloc/test.cc
===================================================================
--- sandbox/trunk/src/nix/btmalloc/test.cc	                        (rev 0)
+++ sandbox/trunk/src/nix/btmalloc/test.cc	2008-11-06 09:16:47 UTC (rev 1062)
@@ -0,0 +1,3 @@
+void foo() { operator new(-1); }
+void bar() { foo(); }
+int main() { bar(); return 0; }


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