From c8f49a9ddc26bfc13c3e801c534dc40f712a8fd5 Mon Sep 17 00:00:00 2001
From: bloodstalker <thabogre@gmail.com>
Date: Wed, 2 Nov 2016 12:27:31 +0330
Subject: now currectly matches the conditions for ifStmt and SOC

---
 mutator.cpp | 108 ++++++++++++++++++++++++++++++++++++++++++++++++++++++++++--
 1 file changed, 105 insertions(+), 3 deletions(-)

diff --git a/mutator.cpp b/mutator.cpp
index 3af8e2b..e634acc 100644
--- a/mutator.cpp
+++ b/mutator.cpp
@@ -28,7 +28,8 @@ using namespace clang::driver;
 using namespace clang::tooling;
 /**********************************************************************************************************************/
 /*global vars*/
-
+/*the variable that holds the previously-matched SOC for class StmtTrap.*/
+std::string g_linenoold;
 
 static llvm::cl::OptionCategory MatcherSampleCategory("Matcher Sample");
 /**********************************************************************************************************************/
@@ -41,7 +42,6 @@ public:
   {
     if (MR.Nodes.getNodeAs<clang::BinaryOperator>("binopeq") != nullptr)
     {
-      /*underdev*/
       /*get the matched node.*/
       const BinaryOperator *BinOp = MR.Nodes.getNodeAs<clang::BinaryOperator>("binopeq");
 
@@ -59,7 +59,9 @@ public:
       }
 
       /*replace it.*/
+#if 0
       Rewrite.ReplaceText(BinOpSL, 2U , "XXX");
+#endif
     }
     else
     {
@@ -67,6 +69,100 @@ public:
     }
   }
 
+private:
+  Rewriter &Rewrite;
+};
+/**********************************************************************************************************************/
+class StmtTrapIf : public MatchFinder::MatchCallback {
+public:
+  StmtTrapIf (Rewriter &Rewrite) : Rewrite(Rewrite) {}
+
+  virtual void run (const MatchFinder::MatchResult &MR)
+  {
+    /*just in case*/
+    if (MR.Nodes.getNodeAs<clang::IfStmt>("iftrap") != nullptr)
+    {
+      /*getting the matched ifStmt.*/
+      const IfStmt *TrapIf = MR.Nodes.getNodeAs<clang::IfStmt>("iftrap");
+
+      /*getting the condition of the matched ifStmt.*/
+      const Expr *IfCond = TrapIf->getCond();
+
+      /*getting the sourcerange of the condition of the trapped ifstmt.*/
+      SourceLocation TrapIfCondSL = IfCond->getLocStart();
+      SourceLocation TrapIfCondSLEnd = IfCond->getLocEnd();
+      SourceRange TrapIfCondSR;
+      TrapIfCondSR.setBegin(TrapIfCondSL);
+      TrapIfCondSR.setEnd(TrapIfCondSLEnd);
+
+      /*replacing the condition with the utility trap function.*/
+      Rewrite.ReplaceText(TrapIfCondSR, "C_Trap_P()");
+    }
+    else
+    {
+      std::cout << "the matcher -iftrap- returned nullptr!" << std::endl;
+    }
+  }
+
+private:
+  Rewriter &Rewrite;
+};
+/**********************************************************************************************************************/
+class StmtTrap : public MatchFinder::MatchCallback {
+public:
+  StmtTrap (Rewriter &Rewrite) : Rewrite(Rewrite) {}
+
+  /*if there are more than 2 statements in the traditional sense in one line, the behavior is undefined.*/
+  /*for now this class only finds an SOC. later to be used for something useful.*/
+  virtual void run (const MatchFinder::MatchResult &MR)
+  {
+    /*out of paranoia*/
+    if (MR.Nodes.getNodeAs<clang::Stmt>("stmttrap") != nullptr)
+    {
+      const Stmt *StmtTrapMR = MR.Nodes.getNodeAs<clang::Stmt>("stmttrap");
+
+      SourceLocation STSL = StmtTrapMR->getLocStart();
+      SourceLocation STSLE = StmtTrapMR->getLocEnd();
+
+      /*just getting the SOC of the matched statement out of its sourcelocation.*/
+      /*this only works since we are guaranteed the same and known matching pattern by MatchFinder.*/
+      size_t startloc = 0U;
+      size_t endloc = 0U;
+      std::string lineno;
+      startloc = STSL.printToString(*MR.SourceManager).find(":", 0U);
+      endloc = STSLE.printToString(*MR.SourceManager).find(":", startloc + 1U);
+      lineno = STSL.printToString(*MR.SourceManager).substr(startloc, endloc - startloc);
+
+      /*just prints out the sourcelocations for diagnostics.*/
+#if 0
+      std::cout << STSL.printToString(*MR.SourceManager) << std::endl;
+      std::cout << STSLE.printToString(*MR.SourceManager) << std::endl;
+      std::cout << startloc << "---" << endloc << "---" << lineno << std::endl;
+#endif
+
+      /*have we matched a new SOC? if yes:*/
+      if (lineno != g_linenoold)
+      {
+        SourceRange SR;
+        SR.setBegin(StmtTrapMR->getLocStart());
+        SR.setEnd(StmtTrapMR->getLocEnd());
+
+        //Rewrite.InsertText(StmtTrapMR->getLocStart(), "XXX", "true", "true");
+      }
+      else
+      {
+        /*intentionally left blank.*/
+      }
+
+      /*set the string representing the old SOC line number to the one matched now.*/
+      g_linenoold = lineno;
+    }
+    else
+    {
+      std::cout << "the matcher -stmttrap- returned nullptr!" << std::endl;
+    }
+  }
+
 private:
   Rewriter &Rewrite;
 };
@@ -75,8 +171,12 @@ private:
 class MyASTConsumer : public ASTConsumer {
 
 public:
-  MyASTConsumer(Rewriter &R) : HandlerForFunction(R) {
+  MyASTConsumer(Rewriter &R) : HandlerForFunction(R), HandlerForIfTrap(R), HandlerForStmtTrap(R) {
     Matcher.addMatcher(binaryOperator(hasOperatorName("==")).bind("binopeq"), &HandlerForFunction);
+
+    Matcher.addMatcher(ifStmt(hasCondition(anything())).bind("iftrap"), &HandlerForIfTrap);
+
+    Matcher.addMatcher(stmt().bind("stmttrap") , &HandlerForStmtTrap);
   }
 
   void HandleTranslationUnit(ASTContext &Context) override {
@@ -85,6 +185,8 @@ public:
 
 private:
   FunctionHandler HandlerForFunction;
+  StmtTrapIf HandlerForIfTrap;
+  StmtTrap HandlerForStmtTrap;
   MatchFinder Matcher;
 };
 /**********************************************************************************************************************/
-- 
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