<div dir="ltr">Hi Qiuping,<div><br></div><div> IIRC, there's a wrapper API for easy use of all type definitions; however I cannot remember exactly now.</div><div> For a void* type, is the size i8? I don't think you can get the size of *p though since this formal parameter of a function in C is no more than an address.</div>
<div> Another tip: you can try some C++11 features(such as range-based for loops) in order to avoid "ugly code", or customize some macros yourself.</div><div><br></div><div class="gmail_extra"><br clear="all">
<div><div dir="ltr"><font color="#313131" face="Arial, sans-serif"><span style="font-size:12px">Thanks and Regards,</span></font><div><font color="#313131" face="Arial, sans-serif"><span style="font-size:12px">Hongxu</span></font></div>
</div></div>
<br><br><div class="gmail_quote">On Tue, May 13, 2014 at 5:01 PM, Qiuping Yi-2 [via LLVM] <span dir="ltr"><<a href="/user/SendEmail.jtp?type=node&node=68554&i=0" target="_top" rel="nofollow" link="external">[hidden email]</a>></span> wrote:<br>
<blockquote style='border-left:2px solid #CCCCCC;padding:0 1em' class="gmail_quote" style="margin:0 0 0 .8ex;border-left:1px #ccc solid;padding-left:1ex">
<div dir="ltr"><div>Hi everyone, </div><div><br></div><div>I have some trouble in instrumenting load instructions. I want to instrument load instructions as follow: Firstly, I judge whether the loaded pointer(<b>any type is possible</b>) is NULL. If so, I want to explicitly allocate the corresponding address space of its type to the pointer. </div>
<div><br></div><div>For example, in source code level I want to translate the next statement </div><div><br></div><div>*p = 1; </div><div><br></div><div>into the next statements</div><div><br></div><div>if (p == NULL) </div>
<div> *p = malloc(sizeof(*p));</div><div>*p = 1;</div><div><br></div><div>For simplicity, I want to wrapper the first two statements into function init. And then I can implement as follow:</div><div><br></div><div>init((void*)p, sizeof(*p));</div>
<div>*p = 1;</div><div><br></div><div>where</div><div><br></div><div>void init(void *p, int size) {</div><div> if (p == NULL)</div><div> p = malloc(size);</div><div>}</div><br clear="all"><div>I am trying to use the next pass for instrumentation:</div>
<div><br></div><div>for (Module::iterator f=M.begin(), fe=M.end(); f!=fe; ++f) {</div><div> for (Function::iterator b=f->begin(), be=f->end(); b!=be; ++b) {</div><div> for (BasicBlock::iterator i=b->begin(), ie=b->end()l i!=ie; ++i) {</div>
<div> if (i->getOpcode() == Instruction::Load) {</div><div> </div><div><b> CallInst::create(....); // add a call inst before inst i to invoke function init</b></div><div><br></div><div>
<br></div><div> }</div><div> }</div><div> }</div><div>}</div><div><br></div><div>So my question is How should I create the previous call inst to execute invocation: init((void*)p, sizeof(p)). Because any pointer type is possible, so I let the first parameter of function init as 'void*'. Furthermore, how should I get the size of *p? I check Type.h, and found class Type only provide function getPrimitiveSizeInBits() to return the size of the primitive types. How can I know the size of other types, eg. the size of a structure type.</div>
<div><p>Any Suggestions are welcome. Thank you all in advance. </p><p>Best Regards!</p></div><div><br>--------------------------------------------<br>Qiuping Yi<br>Institute Of Software<br>Chinese Academy of Sciences</div>
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