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Thank you for your confirmation Eli.<br>
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<font size="3"><b>Thanks,</b></font></div>
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<font size="3"><b>Jason Hu</b></font></div>
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<font size="3"><b><a href="https://hustmphrrr.github.io/" style="">https://hustmphrrr.github.io/</a></b></font><br>
<font size="3"><b></b></font><font style="font-size:12pt" size="3"><span style="color: rgb(69, 129, 142);"><span style="font-family:trebuchet ms,sans-serif"><b><a target="_blank" style=""></a></b></span></span></font></div>
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<div id="divRplyFwdMsg" dir="ltr"><font face="Calibri, sans-serif" style="font-size:11pt" color="#000000"><b>From:</b> Eli Friedman <efriedma@quicinc.com><br>
<b>Sent:</b> April 15, 2020 2:32 PM<br>
<b>To:</b> Jason -Zhong Sheng- Hu <fdhzs2010@hotmail.com>; llvm-dev <llvm-dev@lists.llvm.org><br>
<b>Subject:</b> RE: [llvm-dev] question on the signature of malloc</font>
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<p class="x_MsoNormal">It’s simply wrong.</p>
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<p class="x_MsoNormal">On many 64-bit targets, it will appear to work anyway, depending on your luck, due to the way calling conventions works.
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<p class="x_MsoNormal">-Eli</p>
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<p class="x_MsoNormal" style="margin-left:.5in"><b>From:</b> llvm-dev <llvm-dev-bounces@lists.llvm.org>
<b>On Behalf Of </b>Jason -Zhong Sheng- Hu via llvm-dev<br>
<b>Sent:</b> Tuesday, April 14, 2020 6:49 PM<br>
<b>To:</b> llvm-dev@lists.llvm.org<br>
<b>Subject:</b> [EXT] [llvm-dev] question on the signature of malloc</p>
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<p class="x_MsoNormal" style="margin-left:.5in; background:white"><span style="font-size:12.0pt; color:black">Hi all,</span></p>
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<p class="x_MsoNormal" style="margin-left:.5in; background:white"><span style="font-size:12.0pt; color:black">consider the following function from Core.cpp in LLVM 9.0.0:</span></p>
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<p class="x_MsoNormal" style="margin-left:.5in; background:white"><span style="font-size:12.0pt; font-family:"Courier New"; color:black">LLVMValueRef LLVMBuildMalloc(LLVMBuilderRef B, LLVMTypeRef Ty,</span><span style="font-size:12.0pt; color:black"></span></p>
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<p class="x_MsoNormal" style="margin-left:.5in; background:white"><span style="font-size:12.0pt; font-family:"Courier New"; color:black"> const char *Name) {</span><span style="font-size:12.0pt; color:black"></span></p>
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<p class="x_MsoNormal" style="margin-left:.5in; background:white"><span style="font-size:12.0pt; font-family:"Courier New"; color:black; background:yellow"> Type* ITy = Type::getInt32Ty(unwrap(B)->GetInsertBlock()->getContext());</span><span style="font-size:12.0pt; color:black"></span></p>
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<p class="x_MsoNormal" style="margin-left:.5in; background:white"><span style="font-size:12.0pt; font-family:"Courier New"; color:black"> Constant* AllocSize = ConstantExpr::getSizeOf(unwrap(Ty));</span><span style="font-size:12.0pt; color:black"></span></p>
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<p class="x_MsoNormal" style="margin-left:.5in; background:white"><span style="font-size:12.0pt; font-family:"Courier New"; color:black"> AllocSize = ConstantExpr::getTruncOrBitCast(AllocSize, ITy);</span><span style="font-size:12.0pt; color:black"></span></p>
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<p class="x_MsoNormal" style="margin-left:.5in; background:white"><span style="font-size:12.0pt; font-family:"Courier New"; color:black"> Instruction* Malloc = CallInst::CreateMalloc(unwrap(B)->GetInsertBlock(),</span><span style="font-size:12.0pt; color:black"></span></p>
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<p class="x_MsoNormal" style="margin-left:.5in; background:white"><span style="font-size:12.0pt; font-family:"Courier New"; color:black"> ITy, unwrap(Ty), AllocSize,</span><span style="font-size:12.0pt; color:black"></span></p>
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<p class="x_MsoNormal" style="margin-left:.5in; background:white"><span style="font-size:12.0pt; font-family:"Courier New"; color:black"> nullptr, nullptr, "");</span><span style="font-size:12.0pt; color:black"></span></p>
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<p class="x_MsoNormal" style="margin-left:.5in; background:white"><span style="font-size:12.0pt; font-family:"Courier New"; color:black"> return wrap(unwrap(B)->Insert(Malloc, Twine(Name)));</span><span style="font-size:12.0pt; color:black"></span></p>
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<p class="x_MsoNormal" style="margin-left:.5in; background:white"><span style="font-size:12.0pt; font-family:"Courier New"; color:black">}</span><span style="font-size:12.0pt; color:black"></span></p>
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<p class="x_MsoNormal" style="margin-left:.5in; background:white"><span style="font-size:12.0pt; color:black">In this code I highlighted the line which I have question on. the signature of malloc is</span></p>
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<p class="x_MsoNormal" style="margin-left:.5in; background:white"><span style="font-size:12.0pt; font-family:"Courier New"; color:black">void *malloc(size_t size);</span><span style="font-size:12.0pt; color:black"></span></p>
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<p class="x_MsoNormal" style="margin-left:.5in; background:white"><span style="font-size:12.0pt; color:black">is this suspiciously wrong that this builder assumes size_t is 32 bit int? will LLVM backend smart enough to link the right one, which in 64 bit system
is 64 bit int?</span></p>
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<p class="x_MsoNormal" style="margin-left:.5in"><b><span style="font-size:12.0pt; color:black">Thanks,</span></b><span style="font-size:12.0pt; color:black"></span></p>
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<p class="x_MsoNormal" style="margin-left:.5in"><b><span style="font-size:12.0pt; color:black">Jason Hu</span></b><span style="font-size:12.0pt; color:black"></span></p>
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<p class="x_MsoNormal" style="margin-left:.5in"><b><span style="font-size:12.0pt; color:black"><a href="https://hustmphrrr.github.io/">https://hustmphrrr.github.io/</a></span></b><span style="font-size:12.0pt; color:black"></span></p>
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