c++ - How to increment a Global Variable in a LLVM module? -


i want add instruction @ end of basic block increment globalvariable (using llvm c++ library). pretty new to llvm, can directly or require loading global variable, incrementing desired value , writing global variable ?

even if load variable (with loadinst constructor), how "add" instruction know variable ?

for example, @ ir ocde :

%cell_index = load i32* %cell_index_ptr %new_cell_index = add i32 1, %cell_index

the add instruction knows on variable operate (cell_index). since create load instruction c++ don't know variable created.

yes, you'll have create load, add, , store instructions.

in llvm's c++ class hierarchy, instruction subclasses value. when create loadinst, can refer directly when creating new instructions. example:

irbuilder<> ir(someinsertionpoint); loadinst *load = ir.createload(myglobalvariable); value *inc = ir.createadd(ir.getint32(1), load); storeinst *store = ir.createstore(inc, myglobalvariable);

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