[LLVMdev] Calling OCaml functions from LLVM
jianzhou at seas.upenn.edu
Tue Feb 23 05:21:35 PST 2010
I was trying how to call OCaml code from a LLVM pass. First, I tested
how to call OCaml from
simple C++ code, which works. But when I was calling OCaml from LLVM, I have
the following problems:
1) A linkage error.
To call OCaml from C++, we need to link to libcamlrun.a, which defines
between C and OCaml. But libcamlrun.a also has a main function. So ld complains
it conflicts with the main function in opt.cpp. I did not have this
error in simple C++
and OCaml code. I might screw something up. It reports errors when
as shared libraries and as archives.
2) Initializing OCaml runtime
OCaml requires to initialize its runtime before using OCaml code in C++ via
a function caml_startup. Where is the best place to call call_startup?
or in my pass.
3) Makefile Support
Current Makefile has the default compiling setting for *.c *.ml, and linking
options. But I need to compile the *.ml and *.c that have mixed C and OCaml
with special compilation options and linking arguments.
Does anyone have any idea and an example about how to link OCaml from LLVM?
Thanks in advance
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