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<span style="font-size:14px;text-decoration-style:initial;text-decoration-color:initial;float:none;display:inline">Hi</span><div style="font-size:14px;text-decoration-style:initial;text-decoration-color:initial"><br></div><div style="font-size:14px;text-decoration-style:initial;text-decoration-color:initial">I want to trace the code of clang/llvm CFI <span style="font-size:small;background-color:rgb(255,255,255);text-decoration-style:initial;text-decoration-color:initial;float:none;display:inline">(Control Flow Integrity)</span> mechanism</div><div style="font-size:14px;text-decoration-style:initial;text-decoration-color:initial"><br></div><div style="font-size:14px;text-decoration-style:initial;text-decoration-color:initial">I found that there is <wbr>ForwardControlFlowIntegrity.<wbr>cpp in llvm 3.6</div><div style="font-size:14px;text-decoration-style:initial;text-decoration-color:initial"><br></div><div style="font-size:14px;text-decoration-style:initial;text-decoration-color:initial"><a href="https://github.com/llvm-mirror/llvm/blob/release_36/lib/CodeGen/ForwardControlFlowIntegrity.cpp" target="_blank" style="color:rgb(17,85,204)">https://github.com/llvm-<wbr>mirror/llvm/blob/release_36/<wbr>lib/CodeGen/<wbr>ForwardControlFlowIntegrity.<wbr>cpp</a><br></div><div style="font-size:14px;text-decoration-style:initial;text-decoration-color:initial"><br></div><div style="font-size:14px;text-decoration-style:initial;text-decoration-color:initial">But I don't know which files implement  CFI (Control Flow Integrity)  in later version</div><div style="font-size:14px;text-decoration-style:initial;text-decoration-color:initial"><br></div><div style="font-size:14px;text-decoration-style:initial;text-decoration-color:initial">(1)</div><div style="font-size:14px;text-decoration-style:initial;text-decoration-color:initial"><br></div><div style="font-size:14px;text-decoration-style:initial;text-decoration-color:initial">If I use this command</div><div style="font-size:14px;text-decoration-style:initial;text-decoration-color:initial"><br></div><div style="font-size:14px;text-decoration-style:initial;text-decoration-color:initial">clang-6.0 -fsanitize=cfi-icall -fvisibility=hidden -flto ./test.c<br></div><div style="font-size:14px;text-decoration-style:initial;text-decoration-color:initial"><br></div><div style="font-size:14px;text-decoration-style:initial;text-decoration-color:initial">Which files implement CFI ? </div><div style="font-size:14px;text-decoration-style:initial;text-decoration-color:initial"><br></div><div style="font-size:14px;text-decoration-style:initial;text-decoration-color:initial">(2)</div><div style="font-size:14px;text-decoration-style:initial;text-decoration-color:initial"><br></div><div style="font-size:14px;text-decoration-style:initial;text-decoration-color:initial">I found these two files</div><div style="font-size:14px;text-decoration-style:initial;text-decoration-color:initial"><br></div><div style="font-size:14px;text-decoration-style:initial;text-decoration-color:initial">but I set break point  in gdb , and didn't find anything</div><div style="font-size:14px;text-decoration-style:initial;text-decoration-color:initial"><br></div><div style="font-size:14px;text-decoration-style:initial;text-decoration-color:initial">(gdb) b llvm::CrossDSOCFI::<wbr>buildCFICheck<br></div><div style="font-size:14px;text-decoration-style:initial;text-decoration-color:initial"><br></div><div style="font-size:14px;text-decoration-style:initial;text-decoration-color:initial"><a href="https://github.com/llvm-mirror/llvm/blob/release_60/lib/Transforms/IPO/LowerTypeTests.cpp" target="_blank" style="color:rgb(17,85,204)">https://github.com/llvm-<wbr>mirror/llvm/blob/release_60/<wbr>lib/Transforms/IPO/<wbr>LowerTypeTests.cpp</a><br></div><div style="font-size:14px;text-decoration-style:initial;text-decoration-color:initial"><a href="https://github.com/llvm-mirror/llvm/blob/release_60/lib/Transforms/IPO/CrossDSOCFI.cpp" target="_blank" style="color:rgb(17,85,204)">https://github.com/llvm-<wbr>mirror/llvm/blob/release_60/<wbr>lib/Transforms/IPO/<wbr>CrossDSOCFI.cpp</a><br></div><div style="font-size:14px;text-decoration-style:initial;text-decoration-color:initial"><br></div><div style="font-size:14px;text-decoration-style:initial;text-decoration-color:initial">(3)</div><div style="font-size:14px;text-decoration-style:initial;text-decoration-color:initial"><br></div><div style="font-size:14px;text-decoration-style:initial;text-decoration-color:initial">What's "MCCFIInstruction" ?</div><div style="font-size:14px;text-decoration-style:initial;text-decoration-color:initial"><br></div><div style="font-size:14px;text-decoration-style:initial;text-decoration-color:initial">Does it relate to<span> </span><span style="font-size:small;background-color:rgb(255,255,255);text-decoration-style:initial;text-decoration-color:initial;float:none;display:inline">CFI (Control Flow Integrity) ?</span></div><div style="font-size:14px;text-decoration-style:initial;text-decoration-color:initial"><br></div><div style="font-size:14px;text-decoration-style:initial;text-decoration-color:initial"><a href="http://llvm.org/doxygen/classllvm_1_1MCCFIInstruction.html" target="_blank" style="color:rgb(17,85,204)">http://llvm.org/doxygen/<wbr>classllvm_1_1MCCFIInstruction.<wbr>html</a><br></div><div style="font-size:14px;text-decoration-style:initial;text-decoration-color:initial"><br></div><div style="font-size:14px;text-decoration-style:initial;text-decoration-color:initial">Thanks</div>

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