KernelDataFlow
This is an LLVM pass to traverse a "kernel function" (KF) and record its data flow graph. The resulting graph is constructed such that it does not only provides data flows but also a bit of control flow.
Dependencies
- LLVM >= 3.2
- Clang is preferred
- make
Limitations
It is very likely, that this pass does not handle every input. Thus, asserts may
happen on various situations. The tool is easily extensible. To add a missing
instruction one has to extend src/BlockProcessor/AnalyzeInstruction.cpp.i
Installation
- Match the settings in
Makefile.into your needs - Type
make - Use the generated
KernelDataVolume.soas LLVM pass
Usage
You can input C or C++ code where the kernel function is annotated. Annotation
is done by setting __attribute__((annotate("kernel"))) right before the kernel
function, i.e. its declaration or definition. Once the kernel function was
processed, a graph is generated which currently is written to disk as Graphviz
file. This file can then be further processed, e.g. to create a visualization.
Furthermore, block-related graphs can be found within the graphs directory.
The pass is yet extendable to also use the in-memory graph. To do so, simply
create a new folder inside the src directory, copy the Makefile of one of
the other sub-directories and adapt it. Also adapt the Makefiles in src and
in the root directory as well.