Add gdbinit to tools/ directory.

tools/gdbinit

Index: tools/gdbinit
diff --git a/tools/gdbinit b/tools/gdbinit
new file mode 100644
index 0000000000000000000000000000000000000000..47542c558542da1db316c77e1f9c754bc94c9b60
--- /dev/null
+++ b/tools/gdbinit
@@ -0,0 +1,29 @@
+# Copyright 2014 the V8 project authors. All rights reserved.
+# Use of this source code is governed by a BSD-style license that can be
+# found in the LICENSE file.
+

[Michael Starzinger, 2014/07/07 16:14:30]

nit: I have this comment in my file, maybe it's helpful, your call.

# Additional V8 command: Print objects contents.

[Jakob Kummerow, 2014/07/07 16:21:19]

Done.

+define job
+print ((v8::internal::HeapObject*)($arg0))->Print()
+end
+document job
+Print a v8 JavaScript object
+Usage: job tagged_ptr
+end
+

[Michael Starzinger, 2014/07/07 16:14:30]

# Additional V8 command: Print code object containing given PC.

[Jakob Kummerow, 2014/07/07 16:21:19]

Done.

+define jco
+job (v8::internal::Isolate::Current()->FindCodeObject((v8::internal::Address)$arg0))
+end
+document jco
+Print a v8 Code object from an internal code address
+Usage: jco pc
+end
+

[Michael Starzinger, 2014/07/07 16:14:29]

# Additional V8 command: Print stack trace.

[Jakob Kummerow, 2014/07/07 16:21:18]

Done.

+define jst 
+print v8::internal::Isolate::Current()->PrintStack(stdout)
+end
+document jst
+Print the current JavaScript stack trace
+Usage: jst
+end

[Michael Starzinger, 2014/07/07 16:14:30]

nit: Maybe add an empty newline to separate the last two commands.

[Jakob Kummerow, 2014/07/07 16:21:18]

Done.

+set disassembly-flavor intel
+set disable-randomization off