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<div dir="ltr"><font face="Tahoma" size="2" color="black"><span dir="ltr" style="font-size: 10pt;"><font face="Times New Roman" size="2"><span style="font-size: 16px;"><font face="Tahoma" size="2"><span style="font-size: 10pt;">Hi John,
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<div>Thanks for your reply. "While deleting" is not in my code. </div>
<div>I have carefully checked my pass code, and test.bc which I will run for test, there is no global variable named myFlag. It's a bit weird. This global variable is added by myself in the pass. And the operation I do is just to load the global variable and
store it. I really do not know the reason.<br>
<br>
Module* JFIX::insertCounterMod(Module* mod,Instruction* OptAplusOne,Value* pthreadPID){ //insert myPid[flag++] = pid,after Operation A<br>
<br>
//type definition, myPid[20]<br>
ArrayType* ArrayTy_3 = ArrayType::get(IntegerType::get(mod->getContext(), 64), 20);<br>
<br>
ConstantInt* const_int32_20 = ConstantInt::get(mod->getContext(), APInt(32, StringRef("0"), 10)); //constant definition<br>
ConstantAggregateZero* const_array_23 = ConstantAggregateZero::get(ArrayTy_3);<br>
ConstantInt* const_int32_24 = ConstantInt::get(mod->getContext(), APInt(32, StringRef("1"), 10));<br>
<br>
GlobalVariable* gvar_int32_myFlag = getGlobalFromMap(mod->getModuleIdentifier(),"myFlag");<br>
GlobalVariable* gvar_array_myPid = getGlobalFromMap(mod->getModuleIdentifier(),"myPid");<br>
gvar_int32_myFlag->setInitializer(const_int32_20); //Global Variable Definitions<br>
gvar_array_myPid->setInitializer(const_array_23);<br>
<br>
gvar_int32_myFlag->dump();<br>
gvar_array_myPid->dump();<br>
<br>
LoadInst* int64_64 = new LoadInst(pthreadPID, "", false, OptAplusOne); //do myPid[flag++] = pthreadID<br>
int64_64->setAlignment(8);<br>
LoadInst* int32_65 = new LoadInst(gvar_int32_myFlag, "", false, OptAplusOne);<br>
int32_65->setAlignment(4);<br>
BinaryOperator* int32_inc = BinaryOperator::Create(Instruction::Add, int32_65, const_int32_24, "inc", OptAplusOne);<br>
StoreInst* void_66 = new StoreInst(int32_inc, gvar_int32_myFlag, false, OptAplusOne);<br>
void_66->setAlignment(4);<br>
CastInst* int64_idxprom = new SExtInst(int32_65, IntegerType::get(mod->getContext(), 64), "idxprom", OptAplusOne);<br>
std::vector<Value*> ptr_arrayidx_indices;<br>
ptr_arrayidx_indices.push_back(const_int32_20);<br>
ptr_arrayidx_indices.push_back(int64_idxprom);<br>
Instruction* ptr_arrayidx = GetElementPtrInst::Create(gvar_array_myPid, ptr_arrayidx_indices, "arrayidx", OptAplusOne);<br>
StoreInst* void_67 = new StoreInst(int64_64, ptr_arrayidx, false, OptAplusOne);<br>
void_67->setAlignment(8);<br>
return mod;<br>
}<br>
<br>
Best,<br>
Yuxi<br>
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<div id="divRpF767999" style="direction: ltr;"><font face="Tahoma" size="2" color="#000000"><b>From:</b> John Criswell [jtcriswel@gmail.com]<br>
<b>Sent:</b> Wednesday, March 04, 2015 9:48 PM<br>
<b>To:</b> Yuxi Chen; llvmdev@cs.uiuc.edu<br>
<b>Subject:</b> Re: [LLVMdev] global variable<br>
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<div class="moz-cite-prefix">On 3/4/15 10:13 PM, Yuxi Chen wrote:<br>
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<blockquote type="cite">
<div>Hi all,<br>
<br>
I am newbie for llvm. I just create a global variable, there are some statements in my pass like:<br>
<br>
LoadInst* int64_64 = new LoadInst(pthreadPID, "", false, OptAplusOne);<br>
int64_64->setAlignment(8);<br>
<br>
int64_64->dump();<br>
LoadInst* int32_65 = new LoadInst(gvar_int32_myFlag, "", false, OptAplusOne);<br>
int32_65->setAlignment(4);<br>
<br>
int32_65->dump();<br>
<br>
But when I run my pass, it generates an error, I don't know why.<br>
<br>
@myFlag = global i32 0, align 4<br>
@myPid = common global [20 x i64] zeroinitializer, align 16 //this is the global,
<br>
%117 = load i64* %t, align 8<br>
%118 = load i32* @myFlag, align 4<br>
While deleting: i32* %myFlag<br>
Use still stuck around after Def is destroyed:@myFlag = global i32 <null operand!>, align 4<br>
<br>
I am sure I initialize the global variable myFlag, I don't delete this global variable.<br>
<br>
Can anyone give some hints, or suggestions? <br>
</div>
</blockquote>
<br>
What code is printing the "While deleting:" text? Is it your code that prints that, or is it some existing LLVM pass?<br>
<br>
It looks like something is trying to remove the myFlag global variable, but I don't know what code is trying to do that. I suggest you find that code and figure out why it's trying to remove a global variable that you're still using.<br>
<br>
Regards,<br>
<br>
John Criswell<br>
<br>
<blockquote type="cite">
<div><br>
Yuxi<br>
<br>
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<pre class="moz-signature" cols="72">--
John Criswell
Assistant Professor
Department of Computer Science, University of Rochester
<a class="moz-txt-link-freetext" href="http://www.cs.rochester.edu/u/criswell" target="_blank">http://www.cs.rochester.edu/u/criswell</a></pre>
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