Because I need to convert an [4 x i8] type to i8* in the instantiation of a
GlobalVariable.
I have the follow declaration: %xxx = type { i8* } and I must emit the
following variable:
@yyy = linkonce_odr constant %xxx { [4 x i8] c"hello\00" }, but
it's wrong.
How do I do?
2012/12/18 Óscar Fuentes <ofv at wanadoo.es>
> Alessio Giovanni Baroni <alessiogiovanni.baroni at gmail.com> writes:
>
> > I need the class in object, but the file ConstantsContext,h isn't
> installed.
> >
> > What can I do? Copy that header under include? It's an
installation bug?
>
> That's an internal header, not part of the public API.
>
> Why do you need the classes declared on that header?
>
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Alessio Giovanni Baroni <alessiogiovanni.baroni at gmail.com> writes:> Because I need to convert an [4 x i8] type to i8* in the instantiation of a > GlobalVariable. > I have the follow declaration: %xxx = type { i8* } and I must emit the > following variable: > @yyy = linkonce_odr constant %xxx { [4 x i8] c"hello\00" }, but it's wrong. > > How do I do?You can use the ConstantExpr::getBitCast static member function: http://llvm.org/doxygen/classllvm_1_1ConstantExpr.html#aba93ec4079f8d709a1d5b4745310782e This is a common idiom on LLVM: a base class has static methods for creating instances of derived classes.
Ok, now it's arising another problem. IR code that I obtain is the following: i8* bitcast ([5 x i8] c"hello\00" to i8*) generated from instructions: ConstantExpr::getBitCast (ConstantDataArray::getString (getGlobalContext (), "hello"), PointerType::get (Type::getInt8Ty (getGlobalContext ()), 0)) but the LLC tool says: invalid cast opcode for cast from '[5 x i8]' to 'i8*'. Any help? 2012/12/18 Óscar Fuentes <ofv at wanadoo.es>> Alessio Giovanni Baroni <alessiogiovanni.baroni at gmail.com> writes: > > > Because I need to convert an [4 x i8] type to i8* in the instantiation > of a > > GlobalVariable. > > I have the follow declaration: %xxx = type { i8* } and I must emit the > > following variable: > > @yyy = linkonce_odr constant %xxx { [4 x i8] c"hello\00" }, but it's > wrong. > > > > How do I do? > > You can use the ConstantExpr::getBitCast static member function: > > > http://llvm.org/doxygen/classllvm_1_1ConstantExpr.html#aba93ec4079f8d709a1d5b4745310782e > > This is a common idiom on LLVM: a base class has static methods for > creating instances of derived classes. > > _______________________________________________ > LLVM Developers mailing list > LLVMdev at cs.uiuc.edu http://llvm.cs.uiuc.edu > http://lists.cs.uiuc.edu/mailman/listinfo/llvmdev >-------------- next part -------------- An HTML attachment was scrubbed... URL: <http://lists.llvm.org/pipermail/llvm-dev/attachments/20121219/a998104a/attachment.html>