Monday, March 12, 2018

UB will delete your null checks

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Last week, I committed r326965 to Clang. Some buildbots showed that one of our tests, diagnose_if.c, was crashing reliably after my change. ...
Thursday, November 8, 2012

Funny performance characteristics of DBI tools

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These days I'm working on dynamic binary instrumentation (DBI) tools built with DynamoRIO, in particular Dr. Memory.  One of the things ...
Monday, July 16, 2012

The environment is a command line with a standard format

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This isn't particularly deep, but I was playing with _start and totally static ELF exes yesterday, and I had this minor realization abou...
Monday, December 12, 2011

Stack crawling in DrMemory without frame pointers or debug info

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I work on DrMemory, a dynamic instrumentation tool for finding memory bugs in native apps similar to memcheck, more widely known as just Val...
Thursday, August 11, 2011

Early injection of DBI frameworks on Linux

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I just had an interesting discussion with Qin Zhao about how the various instrumentation frameworks out there achieve early injection. I ha...
Thursday, May 5, 2011

FLAGS dependencies on x86

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One big annoyance I have with x86 in my work on DynamoRIO is the special FLAGS register. You can't read or write to it like a normal re...
Wednesday, April 6, 2011

HipHop talk

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I just went to a talk by Facebook HipHop engineer Haiping Zhao about various systems issues FB has had. There was a discussion of language ...