<div dir="ltr"><div>Thanks to all! It's all ok now.<br><br></div>Alessio.<br><br></div><div class="gmail_extra"><br><br><div class="gmail_quote">2012/12/19 Duncan Sands <span dir="ltr"><<a href="mailto:baldrick@free.fr" target="_blank">baldrick@free.fr</a>></span><br>
<blockquote class="gmail_quote" style="margin:0 0 0 .8ex;border-left:1px #ccc solid;padding-left:1ex"><div class="im">On 19/12/12 10:25, Alessio Giovanni Baroni wrote:<br>
<blockquote class="gmail_quote" style="margin:0 0 0 .8ex;border-left:1px #ccc solid;padding-left:1ex">
Ok, now it's arising another problem. IR code that I obtain is the following:<br>
<br>
i8* bitcast ([5 x i8] c"hello\00" to i8*)<br>
</blockquote>
<br></div>
You need to put your "hello" in a (constant) global variable. You can then<br>
bitcast the address of the global to i8*. I suggest you compile some C code<br>
that makes use of the address of a string using "clang -emit-llvm" to see how<br>
this can be done.<br>
<br>
Ciao, Duncan.<br>
<br>
PS: Unlike in C, in LLVM IR an array is not the same thing as a pointer to the<br>
first element.<br>
<br>
<blockquote class="gmail_quote" style="margin:0 0 0 .8ex;border-left:1px #ccc solid;padding-left:1ex"><div class="im">
<br>
generated from instructions:<br>
<br>
ConstantExpr::getBitCast (ConstantDataArray::getString (getGlobalContext (),<br>
"hello"), PointerType::get (Type::getInt8Ty (getGlobalContext ()), 0))<br>
<br>
but the LLC tool says: invalid cast opcode for cast from '[5 x i8]' to 'i8*'.<br>
<br>
Any help?<br>
<br>
<br></div>
2012/12/18 Óscar Fuentes <<a href="mailto:ofv@wanadoo.es" target="_blank">ofv@wanadoo.es</a> <mailto:<a href="mailto:ofv@wanadoo.es" target="_blank">ofv@wanadoo.es</a>>><br>
<br>
Alessio Giovanni Baroni <<a href="mailto:alessiogiovanni.baroni@gmail.com" target="_blank">alessiogiovanni.baroni@gmail.<u></u>com</a><div class="im"><br>
<mailto:<a href="mailto:alessiogiovanni.baroni@gmail.com" target="_blank">alessiogiovanni.<u></u>baroni@gmail.com</a>>> writes:<br>
<br>
> Because I need to convert an [4 x i8] type to i8* in the instantiation of a<br>
> GlobalVariable.<br>
> I have the follow declaration: %xxx = type { i8* } and I must emit the<br>
> following variable:<br>
> @yyy = linkonce_odr constant %xxx { [4 x i8] c"hello\00" }, but it's wrong.<br>
><br>
> How do I do?<br>
<br>
You can use the ConstantExpr::getBitCast static member function:<br>
<br>
<a href="http://llvm.org/doxygen/classllvm_1_1ConstantExpr.html#aba93ec4079f8d709a1d5b4745310782e" target="_blank">http://llvm.org/doxygen/<u></u>classllvm_1_1ConstantExpr.<u></u>html#<u></u>aba93ec4079f8d709a1d5b47453107<u></u>82e</a><br>
<br>
This is a common idiom on LLVM: a base class has static methods for<br>
creating instances of derived classes.<br>
<br>
______________________________<u></u>_________________<br>
LLVM Developers mailing list<br></div>
<a href="mailto:LLVMdev@cs.uiuc.edu" target="_blank">LLVMdev@cs.uiuc.edu</a> <mailto:<a href="mailto:LLVMdev@cs.uiuc.edu" target="_blank">LLVMdev@cs.uiuc.edu</a>> <a href="http://llvm.cs.uiuc.edu" target="_blank">http://llvm.cs.uiuc.edu</a><div class="im">
<br>
<a href="http://lists.cs.uiuc.edu/mailman/listinfo/llvmdev" target="_blank">http://lists.cs.uiuc.edu/<u></u>mailman/listinfo/llvmdev</a><br>
<br>
<br>
<br>
<br>
______________________________<u></u>_________________<br>
LLVM Developers mailing list<br>
<a href="mailto:LLVMdev@cs.uiuc.edu" target="_blank">LLVMdev@cs.uiuc.edu</a> <a href="http://llvm.cs.uiuc.edu" target="_blank">http://llvm.cs.uiuc.edu</a><br>
<a href="http://lists.cs.uiuc.edu/mailman/listinfo/llvmdev" target="_blank">http://lists.cs.uiuc.edu/<u></u>mailman/listinfo/llvmdev</a><br>
<br>
</div></blockquote><div class="HOEnZb"><div class="h5">
<br>
______________________________<u></u>_________________<br>
LLVM Developers mailing list<br>
<a href="mailto:LLVMdev@cs.uiuc.edu" target="_blank">LLVMdev@cs.uiuc.edu</a> <a href="http://llvm.cs.uiuc.edu" target="_blank">http://llvm.cs.uiuc.edu</a><br>
<a href="http://lists.cs.uiuc.edu/mailman/listinfo/llvmdev" target="_blank">http://lists.cs.uiuc.edu/<u></u>mailman/listinfo/llvmdev</a><br>
</div></div></blockquote></div><br></div>