llvm dev - Dec 2012 - [LLVMdev] how to get and modify a local variable's value through executionEngine?

hello Óscar Fuentes,
thanks for your reply, if i use the API provided by parser.h and the program
*.ll i parsed contains local variable, i can get a module have local
variable without defines it first.
i think that module is a structure like AST(i am not sure whether i was
right), this must be a traversal method. am i right or do i misunderstand
something?



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Dong Chen <jameschennerd at gmail.com> writes:
> hello Óscar Fuentes,
> thanks for your reply, if i use the API provided by parser.h and the
program
> *.ll i parsed contains local variable, i can get a module have local
> variable without defines it first.
> i think that module is a structure like AST(i am not sure whether i was
> right), this must be a traversal method. am i right or do i misunderstand
> something?
Yes, you can traverse the functions and the basic blocks inside those
functions, but how do you detect a local variable? LLVM IR is in SSA
form plus memory loads/stores. A local variable, as you see it in the
original source code (C, C++ or other language) might not clearly map to
a local variable in LLVM IR, depending on how you generate the IR and/or
the passes you run on it.

hi Óscar Fuentes,
i am new to llvm, so i still have several questions. thanks for you help.
(1)what is SSA form(static single assignment)?
(2)how to traverse the basic blocks? if the module is gained by parser, what
will the basic blocks contain?
i will be on the line, thank you very much



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