Monospace font for control flow dot graphs

[mark-sed]

Summary

This is 1/3 changes to the CFG pass that aims to make graphs more readable and contain more information.

• 1. Change - D154092
• 2. Change - D154096
• 3. Change - D154102

This change sets the font to monospace font since almost all programmers are used to these fonts being used for code and makes it thus more readable than the current sans font.

If all 3 changes will be accepted the final graphs should look as in the attached image:

[knaumov]

LGTM

[mark-sed]

I don't have commit rights, could I get someone to commit this for me please?

llvm/include/llvm/Analysis/CFGPrinter.h

std::string getNodeAttributes(const BasicBlock *Node, DOTFuncInfo *CFGInfo) {
 
     uint64_t Freq = CFGInfo->getFreq(Node);
     std::string Color = getHeatColor(Freq, CFGInfo->getMaxFreq());
     std::string EdgeColor = (Freq <= (CFGInfo->getMaxFreq() / 2))
                                 ? (getHeatColor(0))
                                 : (getHeatColor(1));
 
     std::string Attrs = "color=\"" + EdgeColor + "ff\", style=filled," +
-                        " fillcolor=\"" + Color + "70\"";
+                        " fillcolor=\"" + Color + "70\"" +
+                        " fontname=\"Courier\"";
     return Attrs;
   }
   bool isNodeHidden(const BasicBlock *Node, const DOTFuncInfo *CFGInfo);
   void computeDeoptOrUnreachablePaths(const Function *F);
 };
 } // End llvm namespace
 
 namespace llvm {
 class FunctionPass;
 FunctionPass *createCFGPrinterLegacyPassPass();
 FunctionPass *createCFGOnlyPrinterLegacyPassPass();
 } // End llvm namespace
 
 #endif