Add a new method to check if an address point to the beginning of an user alloc

Add a new method to check if an address point to the beginning of an user alloc

This will be useful to check if a block has been allocated without guards.

R=chrisha@chromium.org

BUG=

Committed: https://code.google.com/p/sawbuck/source/detail?r=2275

[Sébastien Marchand, 2014-08-27 20:12:42]

PTAL.

[chrisha, 2014-08-27 20:22:36]

lgtm

https://codereview.appspot.com/131430043/diff/20001/syzygy/agent/asan/shadow.h
File syzygy/agent/asan/shadow.h (right):

https://codereview.appspot.com/131430043/diff/20001/syzygy/agent/asan/shadow....
syzygy/agent/asan/shadow.h:219: // Checks it the address @p addr correspond to
the beginning of a block's
if* the address ... corresponds*

https://codereview.appspot.com/131430043/diff/20001/syzygy/agent/asan/shadow....
syzygy/agent/asan/shadow.h:220: // body, i.e. if it's preceded by a header.
by a left redzone.

https://codereview.appspot.com/131430043/diff/20001/syzygy/agent/asan/shadow....
syzygy/agent/asan/shadow.h:222: // @returns true if the address correspond to
the beginning of a block's body,
corresponds*

https://codereview.appspot.com/131430043/diff/20001/syzygy/agent/asan/shadow_...
File syzygy/agent/asan/shadow_unittest.cc (right):

https://codereview.appspot.com/131430043/diff/20001/syzygy/agent/asan/shadow_...
syzygy/agent/asan/shadow_unittest.cc:414: uint8* data = new uint8[data_size];
Use a scoped_ptr? They can now handle arrays!

[Sébastien Marchand, 2014-08-27 20:36:38]

Thanks, committing.

https://codereview.appspot.com/131430043/diff/20001/syzygy/agent/asan/shadow.h
File syzygy/agent/asan/shadow.h (right):

https://codereview.appspot.com/131430043/diff/20001/syzygy/agent/asan/shadow....
syzygy/agent/asan/shadow.h:219: // Checks it the address @p addr correspond to
the beginning of a block's
On 2014/08/27 20:22:36, chrisha wrote:
> if* the address ... corresponds*

Done.

https://codereview.appspot.com/131430043/diff/20001/syzygy/agent/asan/shadow....
syzygy/agent/asan/shadow.h:220: // body, i.e. if it's preceded by a header.
On 2014/08/27 20:22:36, chrisha wrote:
> by a left redzone.

Done.

https://codereview.appspot.com/131430043/diff/20001/syzygy/agent/asan/shadow....
syzygy/agent/asan/shadow.h:222: // @returns true if the address correspond to
the beginning of a block's body,
On 2014/08/27 20:22:36, chrisha wrote:
> corresponds*

Done.

https://codereview.appspot.com/131430043/diff/20001/syzygy/agent/asan/shadow_...
File syzygy/agent/asan/shadow_unittest.cc (right):

https://codereview.appspot.com/131430043/diff/20001/syzygy/agent/asan/shadow_...
syzygy/agent/asan/shadow_unittest.cc:414: uint8* data = new uint8[data_size];
On 2014/08/27 20:22:36, chrisha wrote:
> Use a scoped_ptr? They can now handle arrays!

Done.

[Sébastien Marchand, 2014-08-27 20:37:36]

Committed patchset #3 (id:40001) manually as 2275.