[LLVMdev] viewCFG call from opt loaded shared lib
wilsonk at cpsc.ucalgary.ca
Sun Oct 29 22:45:39 PST 2006
I want to call F.viewCFG() from within the Hello.so shared library
runOnFunction() function, but I keep getting:
opt: symbol lookup error: ../../../Debug/lib/LLVMHello.so: undefined
"opt -load ../../../Debug/lib/LLVMHello.so -print
I assume this means that I need to statically link in
LLVMAnalysis.a/LLVMCodeGen.a where viewCFG is located. I changed the
Makefile by adding these libs to the LLVMlibs variable and
recompiled successfully. I still get the same error, though.
I look at the VERBOSE=1 output for make and the "-lLLVMAnalysis
-lLLVMCodeGen" linking is not done. I tried it manually but I still get
What I want to do is load Hello.so using opt, and then
1. run part way through runOnFunction()
2. print out the CFG
3. modify the CFG (ie. SplitCriticalEdges or something)
4. loop to 2.
I also tried to run opt inside gdb and break at runOnfunction(). This
gives me a warning:
Function "runOnFunction" not defined.
Make breakpoint pending on future shared library load? (y or [n])
I choose y but there is no breakpoint set. If I can get this break point
then I can manually call viewCFG() (once the libs are statically linked, I
P.S. I know that I can push Hello.cpp into the llvm/lib/Transforms/...
directory, recompile and then use opt with the -hello option (then I get
the graph output I want). It just takes A LONG TIME to recompile
everything that depends on the Scalar lib stuff. Trying to speed up the
compile-link-run cycle here.
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