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/*first line intentionally left blank.*/
/**********************************************************************************************************************/
/*included modules*/
/*standard library*/
#include <string>
#include <iostream>
#include <cassert>
/*LLVM-libs*/
#include "clang/AST/AST.h"
#include "clang/AST/ASTConsumer.h"
#include "clang/ASTMatchers/ASTMatchers.h"
#include "clang/ASTMatchers/ASTMatchFinder.h"
#include "clang/Frontend/CompilerInstance.h"
#include "clang/Frontend/FrontendActions.h"
#include "clang/Lex/Lexer.h"
#include "clang/Tooling/CommonOptionsParser.h"
#include "clang/Tooling/Tooling.h"
#include "clang/Rewrite/Core/Rewriter.h"
#include "llvm/Support/raw_ostream.h"
#include "llvm/IR/Function.h"
/**********************************************************************************************************************/
/*used namespaces*/
using namespace llvm;
using namespace clang;
using namespace clang::ast_matchers;
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");
/**********************************************************************************************************************/
/*matcher callback for something.*/
class FunctionHandler : public MatchFinder::MatchCallback {
public:
FunctionHandler (Rewriter &Rewrite) : Rewrite(Rewrite) {}
virtual void run(const MatchFinder::MatchResult &MR)
{
if (MR.Nodes.getNodeAs<clang::BinaryOperator>("binopeq") != nullptr)
{
/*get the matched node.*/
const BinaryOperator *BinOp = MR.Nodes.getNodeAs<clang::BinaryOperator>("binopeq");
/*get the sourceloation.*/
SourceLocation BinOpSL = BinOp->getLocStart();
/*does the sourcelocation include a macro expansion?*/
if ( BinOpSL.isMacroID() )
{
/*get the expansion range which is startloc and endloc*/
std::pair <SourceLocation, SourceLocation> expansionRange = Rewrite.getSourceMgr().getImmediateExpansionRange(BinOpSL);
/*get the startloc.*/
BinOpSL = expansionRange.first;
}
/*replace it.*/
#if 0
Rewrite.ReplaceText(BinOpSL, 2U , "XXX");
#endif
}
else
{
std::cout << "the macther -binopeq- returned nullptr!" << std::endl;
}
}
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;
};
/**********************************************************************************************************************/
/**********************************************************************************************************************/
class MyASTConsumer : public ASTConsumer {
public:
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 {
Matcher.matchAST(Context);
}
private:
FunctionHandler HandlerForFunction;
StmtTrapIf HandlerForIfTrap;
StmtTrap HandlerForStmtTrap;
MatchFinder Matcher;
};
/**********************************************************************************************************************/
class MyFrontendAction : public ASTFrontendAction {
public:
MyFrontendAction() {}
void EndSourceFileAction() override {
TheRewriter.getEditBuffer(TheRewriter.getSourceMgr().getMainFileID()).write(llvm::outs());
}
std::unique_ptr<ASTConsumer> CreateASTConsumer(CompilerInstance &CI, StringRef file) override {
TheRewriter.setSourceMgr(CI.getSourceManager(), CI.getLangOpts());
return llvm::make_unique<MyASTConsumer>(TheRewriter);
}
private:
Rewriter TheRewriter;
};
/**********************************************************************************************************************/
/*MAIN*/
int main(int argc, const char **argv) {
CommonOptionsParser op(argc, argv, MatcherSampleCategory);
ClangTool Tool(op.getCompilations(), op.getSourcePathList());
return Tool.run(newFrontendActionFactory<MyFrontendAction>().get());
}
/*last line intentionally left blank.*/
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