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<div class=Section1>
<p class=MsoNormal>Hola LLVMers, <o:p></o:p></p>
<p class=MsoNormal><o:p> </o:p></p>
<p class=MsoNormal>I’m debugging through some strangeness that I’m
seeing on X64 on windows with LLVM2.2. I had to change the code so that it
would engage the x64 target machine on windows builds, but I’ve otherwise
left LLVM 2.2 alone. The basic idea is that I’ve got a function bar
which is compiled by VStudio and I’m creating another function foo via
LLVM JIT which is going to call into bar. This has been working for me for a long
time on win32 and also under xcode of course. I’ve included the code
that generates the situation at the bottom. Some questions (which may be
really brain dead) are:<o:p></o:p></p>
<p class=MsoNormal><o:p> </o:p></p>
<p class=MsoListParagraph style='text-indent:-.25in;mso-list:l0 level1 lfo1'><![if !supportLists]><span
style='mso-list:Ignore'>1.<span style='font:7.0pt "Times New Roman"'>
</span></span><![endif]>Why isn’t the stack getting set up in foo prior
to the call down into bar?<o:p></o:p></p>
<p class=MsoListParagraph style='text-indent:-.25in;mso-list:l0 level1 lfo1'><![if !supportLists]><span
style='mso-list:Ignore'>2.<span style='font:7.0pt "Times New Roman"'>
</span></span><![endif]>Why is the call to bar a pointer to a jump. I.e. why
didn’t it resolve the address in foo?<o:p></o:p></p>
<p class=MsoListParagraph style='text-indent:-.25in;mso-list:l0 level1 lfo1'><![if !supportLists]><span
style='mso-list:Ignore'>3.<span style='font:7.0pt "Times New Roman"'>
</span></span><![endif]>What are some good places for me to be looking to try
and drill down further on what’s happening? I’ve tried switching calling
conventions and have watched it create machine instructions for adjusting the
stack up and down, but they seem to be removed by the time it actually gets
down to execution time. <o:p></o:p></p>
<p class=MsoNormal><o:p> </o:p></p>
<p class=MsoNormal>Any suggestions would be appreciated.<o:p></o:p></p>
<p class=MsoNormal><o:p> </o:p></p>
<p class=MsoNormal>Thanks,<o:p></o:p></p>
<p class=MsoNormal>Chuck.<o:p></o:p></p>
<p class=MsoNormal><o:p> </o:p></p>
<p class=MsoNormal>Call into function (foo)<o:p></o:p></p>
<p class=MsoNormal style='text-autospace:none'><span style='font-size:8.0pt;
font-family:"Courier New";color:gray'>0000000000980030 mov
rax,140001591h <o:p></o:p></span></p>
<p class=MsoNormal style='text-autospace:none'><span style='font-size:8.0pt;
font-family:"Courier New";color:gray'>000000000098003A call rax </span><span
style='font-size:8.0pt;font-family:Wingdings;color:gray'>ß</span><span
style='font-size:8.0pt;font-family:"Courier New";color:gray'> this is calling
to bar via a jump table<o:p></o:p></span></p>
<p class=MsoNormal style='text-autospace:none'><span style='font-size:8.0pt;
font-family:"Courier New";color:gray'>000000000098003C ret <o:p></o:p></span></p>
<p class=MsoNormal><o:p> </o:p></p>
<p class=MsoNormal>Leads to <o:p></o:p></p>
<p class=MsoNormal style='text-autospace:none'><span style='font-size:8.0pt;
font-family:"Courier New";color:gray'>0000000140001591 jmp bar
(1400064E0h) <o:p></o:p></span></p>
<p class=MsoNormal><o:p> </o:p></p>
<p class=MsoNormal>Leads to<o:p></o:p></p>
<p class=MsoNormal style='text-autospace:none'><span style='font-size:8.0pt;
font-family:"Courier New"'>void bar(int i)<o:p></o:p></span></p>
<p class=MsoNormal style='text-autospace:none'><span style='font-size:8.0pt;
font-family:"Courier New"'>{<o:p></o:p></span></p>
<p class=MsoNormal style='text-autospace:none'><span style='font-size:8.0pt;
font-family:"Courier New";color:gray'>00000001400064E0 mov dword ptr
[rsp+8],ecx <o:p></o:p></span></p>
<p class=MsoNormal style='text-autospace:none'><span style='font-size:8.0pt;
font-family:"Courier New";color:gray'>00000001400064E4 push rdi <o:p></o:p></span></p>
<p class=MsoNormal style='text-autospace:none'><span style='font-size:8.0pt;
font-family:"Courier New";color:gray'>00000001400064E5 sub rsp,20h <o:p></o:p></span></p>
<p class=MsoNormal style='text-autospace:none'><span style='font-size:8.0pt;
font-family:"Courier New";color:gray'>00000001400064E9 mov rdi,rsp <o:p></o:p></span></p>
<p class=MsoNormal style='text-autospace:none'><span style='font-size:8.0pt;
font-family:"Courier New";color:gray'>00000001400064EC mov rcx,8 <o:p></o:p></span></p>
<p class=MsoNormal style='text-autospace:none'><span style='font-size:8.0pt;
font-family:"Courier New";color:gray'>00000001400064F6 mov
eax,0CCCCCCCCh <o:p></o:p></span></p>
<p class=MsoNormal style='text-autospace:none'><span style='font-size:8.0pt;
font-family:"Courier New";color:gray'>00000001400064FB rep stos dword ptr
[rdi] <o:p></o:p></span></p>
<p class=MsoNormal style='text-autospace:none'><span style='font-size:8.0pt;
font-family:"Courier New";color:gray'>00000001400064FD mov ecx,dword
ptr [rsp+30h] <o:p></o:p></span></p>
<p class=MsoNormal style='text-autospace:none'><span style='font-size:8.0pt;
font-family:"Courier New"'> printf("the int is %i\n",i);<o:p></o:p></span></p>
<p class=MsoNormal style='text-autospace:none'><span style='font-size:8.0pt;
font-family:"Courier New";color:gray'>0000000140006501 mov edx,dword
ptr [i] <o:p></o:p></span></p>
<p class=MsoNormal style='text-autospace:none'><span style='font-size:8.0pt;
font-family:"Courier New";color:gray'>0000000140006505 lea rcx,[string
"the int is %i\n" (140C1A240h)] <o:p></o:p></span></p>
<p class=MsoNormal style='text-autospace:none'><span style='font-size:8.0pt;
font-family:"Courier New";color:gray'>000000014000650C call qword ptr
[__imp_printf (141145920h)] <o:p></o:p></span></p>
<p class=MsoNormal style='text-autospace:none'><span style='font-size:8.0pt;
font-family:"Courier New"'>}<o:p></o:p></span></p>
<p class=MsoNormal style='text-autospace:none'><span style='font-size:8.0pt;
font-family:"Courier New";color:gray'>0000000140006512 add rsp,20h <o:p></o:p></span></p>
<p class=MsoNormal style='text-autospace:none'><span style='font-size:8.0pt;
font-family:"Courier New";color:gray'>0000000140006516 pop rdi <o:p></o:p></span></p>
<p class=MsoNormal style='text-autospace:none'><span style='font-size:8.0pt;
font-family:"Courier New";color:gray'>0000000140006517 ret <o:p></o:p></span></p>
<p class=MsoNormal><o:p> </o:p></p>
<p class=MsoNormal>At this point, we seem to be jumping back up but the stack
is no longer in order, so <o:p></o:p></p>
<p class=MsoNormal style='text-autospace:none'><span style='font-size:8.0pt;
font-family:"Courier New";color:gray'>000000000098003C ret <o:p></o:p></span></p>
<p class=MsoNormal><o:p> </o:p></p>
<p class=MsoNormal>Takes us into wonderland<o:p></o:p></p>
<p class=MsoNormal style='text-autospace:none'><span style='font-size:8.0pt;
font-family:"Courier New";color:gray'>0000000100000003 ??? <o:p></o:p></span></p>
<p class=MsoNormal><o:p> </o:p></p>
<p class=MsoNormal>But unfortunately not through the looking glass.<o:p></o:p></p>
<p class=MsoNormal><o:p> </o:p></p>
<p class=MsoNormal>Here’s the modification of the Fibonacci program which
got me the above:<o:p></o:p></p>
<p class=MsoNormal style='text-autospace:none'><span style='font-size:10.0pt;
font-family:"Courier New";color:blue'>#include</span><span style='font-size:
10.0pt;font-family:"Courier New"'> <span style='color:#A31515'>"llvm/Module.h"<o:p></o:p></span></span></p>
<p class=MsoNormal style='text-autospace:none'><span style='font-size:10.0pt;
font-family:"Courier New";color:blue'>#include</span><span style='font-size:
10.0pt;font-family:"Courier New"'> <span style='color:#A31515'>"llvm/DerivedTypes.h"<o:p></o:p></span></span></p>
<p class=MsoNormal style='text-autospace:none'><span style='font-size:10.0pt;
font-family:"Courier New";color:blue'>#include</span><span style='font-size:
10.0pt;font-family:"Courier New"'> <span style='color:#A31515'>"llvm/Constants.h"<o:p></o:p></span></span></p>
<p class=MsoNormal style='text-autospace:none'><span style='font-size:10.0pt;
font-family:"Courier New";color:blue'>#include</span><span style='font-size:
10.0pt;font-family:"Courier New"'> <span style='color:#A31515'>"llvm/Instructions.h"<o:p></o:p></span></span></p>
<p class=MsoNormal style='text-autospace:none'><span style='font-size:10.0pt;
font-family:"Courier New";color:blue'>#include</span><span style='font-size:
10.0pt;font-family:"Courier New"'> <span style='color:#A31515'>"llvm/ModuleProvider.h"<o:p></o:p></span></span></p>
<p class=MsoNormal style='text-autospace:none'><span style='font-size:10.0pt;
font-family:"Courier New";color:blue'>#include</span><span style='font-size:
10.0pt;font-family:"Courier New"'> <span style='color:#A31515'>"llvm/Analysis/Verifier.h"<o:p></o:p></span></span></p>
<p class=MsoNormal style='text-autospace:none'><span style='font-size:10.0pt;
font-family:"Courier New";color:blue'>#include</span><span style='font-size:
10.0pt;font-family:"Courier New"'> <span style='color:#A31515'>"llvm/ExecutionEngine/JIT.h"<o:p></o:p></span></span></p>
<p class=MsoNormal style='text-autospace:none'><span style='font-size:10.0pt;
font-family:"Courier New";color:blue'>#include</span><span style='font-size:
10.0pt;font-family:"Courier New"'> <span style='color:#A31515'>"llvm/ExecutionEngine/Interpreter.h"<o:p></o:p></span></span></p>
<p class=MsoNormal style='text-autospace:none'><span style='font-size:10.0pt;
font-family:"Courier New";color:blue'>#include</span><span style='font-size:
10.0pt;font-family:"Courier New"'> <span style='color:#A31515'>"llvm/ExecutionEngine/GenericValue.h"<o:p></o:p></span></span></p>
<p class=MsoNormal style='text-autospace:none'><span style='font-size:10.0pt;
font-family:"Courier New";color:blue'>#include</span><span style='font-size:
10.0pt;font-family:"Courier New"'> <span style='color:#A31515'>"llvm/System/DynamicLibrary.h"<o:p></o:p></span></span></p>
<p class=MsoNormal style='text-autospace:none'><span style='font-size:10.0pt;
font-family:"Courier New";color:blue'>#include</span><span style='font-size:
10.0pt;font-family:"Courier New"'> <span style='color:#A31515'>"llvm/CallingConv.h"<o:p></o:p></span></span></p>
<p class=MsoNormal style='text-autospace:none'><span style='font-size:10.0pt;
font-family:"Courier New";color:blue'>#include</span><span style='font-size:
10.0pt;font-family:"Courier New"'> <span style='color:#A31515'><iostream><o:p></o:p></span></span></p>
<p class=MsoNormal style='text-autospace:none'><span style='font-size:10.0pt;
font-family:"Courier New";color:blue'>#include</span><span style='font-size:
10.0pt;font-family:"Courier New"'> <span style='color:#A31515'><stdio.h><o:p></o:p></span></span></p>
<p class=MsoNormal style='text-autospace:none'><span style='font-size:10.0pt;
font-family:"Courier New";color:blue'>using</span><span style='font-size:10.0pt;
font-family:"Courier New"'> <span style='color:blue'>namespace</span> llvm;<o:p></o:p></span></p>
<p class=MsoNormal style='text-autospace:none'><span style='font-size:10.0pt;
font-family:"Courier New"'><o:p> </o:p></span></p>
<p class=MsoNormal style='text-autospace:none'><span style='font-size:10.0pt;
font-family:"Courier New";color:blue'>void</span><span style='font-size:10.0pt;
font-family:"Courier New"'> bar(<span style='color:blue'>int</span> i)<o:p></o:p></span></p>
<p class=MsoNormal style='text-autospace:none'><span style='font-size:10.0pt;
font-family:"Courier New"'>{<o:p></o:p></span></p>
<p class=MsoNormal style='text-autospace:none'><span style='font-size:10.0pt;
font-family:"Courier New"'> printf(<span style='color:#A31515'>"the int
is %i\n"</span>,i);<o:p></o:p></span></p>
<p class=MsoNormal style='text-autospace:none'><span style='font-size:10.0pt;
font-family:"Courier New"'>}<o:p></o:p></span></p>
<p class=MsoNormal style='text-autospace:none'><span style='font-size:10.0pt;
font-family:"Courier New"'><o:p> </o:p></span></p>
<p class=MsoNormal style='text-autospace:none'><span style='font-size:10.0pt;
font-family:"Courier New"'>Function* createBarFunction(Module* M)<o:p></o:p></span></p>
<p class=MsoNormal style='text-autospace:none'><span style='font-size:10.0pt;
font-family:"Courier New"'>{<o:p></o:p></span></p>
<p class=MsoNormal style='text-autospace:none'><span style='font-size:10.0pt;
font-family:"Courier New"'> Function* pBarF =
cast<Function>(M->getOrInsertFunction(<span style='color:#A31515'>"bar"</span>,
Type::VoidTy, Type::Int32Ty, NULL));<o:p></o:p></span></p>
<p class=MsoNormal style='text-autospace:none'><span style='font-size:10.0pt;
font-family:"Courier New"'> <span style='color:blue'>return</span> pBarF;<o:p></o:p></span></p>
<p class=MsoNormal style='text-autospace:none'><span style='font-size:10.0pt;
font-family:"Courier New"'>}<o:p></o:p></span></p>
<p class=MsoNormal style='text-autospace:none'><span style='font-size:10.0pt;
font-family:"Courier New"'><o:p> </o:p></span></p>
<p class=MsoNormal style='text-autospace:none'><span style='font-size:10.0pt;
font-family:"Courier New"'>Function* createFooFunction(Module* M)<o:p></o:p></span></p>
<p class=MsoNormal style='text-autospace:none'><span style='font-size:10.0pt;
font-family:"Courier New"'>{<o:p></o:p></span></p>
<p class=MsoNormal style='text-autospace:none'><span style='font-size:10.0pt;
font-family:"Courier New"'> Function* pBarF = createBarFunction(M),<o:p></o:p></span></p>
<p class=MsoNormal style='text-autospace:none'><span style='font-size:10.0pt;
font-family:"Courier New"'> * pFooF;<o:p></o:p></span></p>
<p class=MsoNormal style='text-autospace:none'><span style='font-size:10.0pt;
font-family:"Courier New"'><o:p> </o:p></span></p>
<p class=MsoNormal style='text-autospace:none'><span style='font-size:10.0pt;
font-family:"Courier New"'> pFooF =
cast<Function>(M->getOrInsertFunction(<span style='color:#A31515'>"foo"</span>,
Type::VoidTy, Type::Int32Ty, NULL));<o:p></o:p></span></p>
<p class=MsoNormal style='text-autospace:none'><span style='font-size:10.0pt;
font-family:"Courier New"'> BasicBlock* pBody = <span style='color:blue'>new</span>
BasicBlock(<span style='color:#A31515'>"body"</span>,pFooF);<o:p></o:p></span></p>
<p class=MsoNormal style='text-autospace:none'><span style='font-size:10.0pt;
font-family:"Courier New"'> Argument* pArg = pFooF->arg_begin();<o:p></o:p></span></p>
<p class=MsoNormal style='text-autospace:none'><span style='font-size:10.0pt;
font-family:"Courier New"'> pArg->setName(<span style='color:#A31515'>"i"</span>);<o:p></o:p></span></p>
<p class=MsoNormal style='text-autospace:none'><span style='font-size:10.0pt;
font-family:"Courier New"'> std::vector<Value*> barArgs;<o:p></o:p></span></p>
<p class=MsoNormal style='text-autospace:none'><span style='font-size:10.0pt;
font-family:"Courier New"'> barArgs.push_back(pArg);<o:p></o:p></span></p>
<p class=MsoNormal style='text-autospace:none'><span style='font-size:10.0pt;
font-family:"Courier New"'> <span style='color:blue'>new</span>
CallInst(pBarF, barArgs.begin(), barArgs.end(), <span style='color:#A31515'>""</span>,
pBody);<o:p></o:p></span></p>
<p class=MsoNormal style='text-autospace:none'><span style='font-size:10.0pt;
font-family:"Courier New"'> <span style='color:blue'>new</span>
ReturnInst(NULL, pBody);<o:p></o:p></span></p>
<p class=MsoNormal style='text-autospace:none'><span style='font-size:10.0pt;
font-family:"Courier New"'> <span style='color:blue'>return</span> pFooF;<o:p></o:p></span></p>
<p class=MsoNormal style='text-autospace:none'><span style='font-size:10.0pt;
font-family:"Courier New"'>}<o:p></o:p></span></p>
<p class=MsoNormal style='text-autospace:none'><span style='font-size:10.0pt;
font-family:"Courier New"'><o:p> </o:p></span></p>
<p class=MsoNormal style='text-autospace:none'><span style='font-size:10.0pt;
font-family:"Courier New";color:blue'>int</span><span style='font-size:10.0pt;
font-family:"Courier New"'> main(<span style='color:blue'>int</span> argc, <span
style='color:blue'>char</span> **argv) {<o:p></o:p></span></p>
<p class=MsoNormal style='text-autospace:none'><span style='font-size:10.0pt;
font-family:"Courier New"'> <span style='color:green'>// Create some module
to put our function into it.<o:p></o:p></span></span></p>
<p class=MsoNormal style='text-autospace:none'><span style='font-size:10.0pt;
font-family:"Courier New"'> Module *M = <span style='color:blue'>new</span>
Module(<span style='color:#A31515'>"test"</span>);<o:p></o:p></span></p>
<p class=MsoNormal style='text-autospace:none'><span style='font-size:10.0pt;
font-family:"Courier New"'><o:p> </o:p></span></p>
<p class=MsoNormal style='text-autospace:none'><span style='font-size:10.0pt;
font-family:"Courier New"'> M->setDataLayout(<span style='color:#A31515'>"e-p:64:64:64-i1:8:8:8-i8:8:8:8-i32:32:32:32-f32:32:32:32"</span>);<o:p></o:p></span></p>
<p class=MsoNormal style='text-autospace:none'><span style='font-size:10.0pt;
font-family:"Courier New"'> Function* pFooF = createFooFunction(M);<o:p></o:p></span></p>
<p class=MsoNormal style='text-autospace:none'><span style='font-size:10.0pt;
font-family:"Courier New"'> M->print(std::cout);<o:p></o:p></span></p>
<p class=MsoNormal style='text-autospace:none'><span style='font-size:10.0pt;
font-family:"Courier New"'><o:p> </o:p></span></p>
<p class=MsoNormal style='text-autospace:none'><span style='font-size:10.0pt;
font-family:"Courier New"'> <span style='color:green'>// Now we going to
create JIT<o:p></o:p></span></span></p>
<p class=MsoNormal style='text-autospace:none'><span style='font-size:10.0pt;
font-family:"Courier New"'> ExistingModuleProvider *MP = <span
style='color:blue'>new</span> ExistingModuleProvider(M);<o:p></o:p></span></p>
<p class=MsoNormal style='text-autospace:none'><span style='font-size:10.0pt;
font-family:"Courier New"'> ExecutionEngine *EE =
ExecutionEngine::create(MP, <span style='color:blue'>false</span>);<o:p></o:p></span></p>
<p class=MsoNormal style='text-autospace:none'><span style='font-size:10.0pt;
font-family:"Courier New"'><o:p> </o:p></span></p>
<p class=MsoNormal style='text-autospace:none'><span style='font-size:10.0pt;
font-family:"Courier New"'> sys::DynamicLibrary::AddSymbol(<span
style='color:#A31515'>"bar"</span>, (<span style='color:blue'>void</span>*)
bar);<o:p></o:p></span></p>
<p class=MsoNormal style='text-autospace:none'><span style='font-size:10.0pt;
font-family:"Courier New"'> llvm::Module::FunctionListType& funcList =
MP->getModule()->getFunctionList();<o:p></o:p></span></p>
<p class=MsoNormal style='text-autospace:none'><span style='font-size:10.0pt;
font-family:"Courier New"'><o:p> </o:p></span></p>
<p class=MsoNormal style='text-autospace:none'><span style='font-size:10.0pt;
font-family:"Courier New"'> <span style='color:blue'>for</span>
(llvm::Module::FunctionListType::iterator i = funcList.begin() ; i !=
funcList.end() ; ++i)<o:p></o:p></span></p>
<p class=MsoNormal style='text-autospace:none'><span style='font-size:10.0pt;
font-family:"Courier New"'> {<o:p></o:p></span></p>
<p class=MsoNormal style='text-autospace:none'><span style='font-size:10.0pt;
font-family:"Courier New"'> EE->getPointerToFunction(i);<o:p></o:p></span></p>
<p class=MsoNormal style='text-autospace:none'><span style='font-size:10.0pt;
font-family:"Courier New"'> }<o:p></o:p></span></p>
<p class=MsoNormal style='text-autospace:none'><span style='font-size:10.0pt;
font-family:"Courier New"'><o:p> </o:p></span></p>
<p class=MsoNormal style='text-autospace:none'><span style='font-size:10.0pt;
font-family:"Courier New"'> EE->recompileAndRelinkFunction(pFooF);<o:p></o:p></span></p>
<p class=MsoNormal style='text-autospace:none'><span style='font-size:10.0pt;
font-family:"Courier New"'><o:p> </o:p></span></p>
<p class=MsoNormal style='text-autospace:none'><span style='font-size:10.0pt;
font-family:"Courier New"'> std::vector<GenericValue> Args(1);<o:p></o:p></span></p>
<p class=MsoNormal style='text-autospace:none'><span style='font-size:10.0pt;
font-family:"Courier New"'> Args[0].IntVal = APInt(32, 3);<o:p></o:p></span></p>
<p class=MsoNormal style='text-autospace:none'><span style='font-size:10.0pt;
font-family:"Courier New"'> GenericValue GV = EE->runFunction(pFooF,
Args);<o:p></o:p></span></p>
<p class=MsoNormal style='text-autospace:none'><span style='font-size:10.0pt;
font-family:"Courier New"'><o:p> </o:p></span></p>
<p class=MsoNormal style='text-autospace:none'><span style='font-size:10.0pt;
font-family:"Courier New"'> <span style='color:blue'>return</span> 0;<o:p></o:p></span></p>
<p class=MsoNormal style='text-autospace:none'><span style='font-size:10.0pt;
font-family:"Courier New"'>}<o:p></o:p></span></p>
<p class=MsoNormal><o:p> </o:p></p>
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