ast matcher with libtooling

README.md

@@ -8,3 +8,6 @@
     metadata.
 
 - `clang-plugins`: suite of examples of clang plugins.
+
+
+- `ast-matcher`: AST matcher implementation with LibTooling

ast-matcher/CMakeLists.txt

@@ -0,0 +1,11 @@
+
+cmake_minimum_required(VERSION 3.20)
+
+set(CMAKE_CXX_STANDARD "20")
+project(forMatcher)
+
+set(CMAKE_BUILD_TYPE RelWithDebInfo)
+
+set(CMAKE_RUNTIME_OUTPUT_DIRECTORY ${CMAKE_BINARY_DIR}/bin)
+
+add_subdirectory(lib)

ast-matcher/input/for1.c

@@ -0,0 +1,8 @@
+int main()
+{
+	int sum = 10;
+	for (int i = 0; i < 10; i++)
+	{
+		sum += i;
+	}
+}

ast-matcher/lib/CMakeLists.txt

@@ -0,0 +1,8 @@
+
+find_package(Clang REQUIRED)
+include_directories(${LLVM_INCLUDE_DIRS} ${CLANG_INCLUDE_DIRS})
+add_definitions(${LLVM_DEFINITIONS})
+
+add_executable(forMatcher forMatcher.cpp)
+
+target_link_libraries(forMatcher clangTooling)

ast-matcher/lib/forMatcher.cpp

@@ -0,0 +1,74 @@
+// Declares clang::SyntaxOnlyAction.
+#include "clang/Frontend/FrontendActions.h"
+#include "clang/Tooling/CommonOptionsParser.h"
+#include "clang/Tooling/Tooling.h"
+// Declares llvm::cl::extrahelp.
+#include "llvm/Support/CommandLine.h"
+#include "clang/ASTMatchers/ASTMatchers.h"
+#include "clang/ASTMatchers/ASTMatchFinder.h"
+
+using namespace clang::ast_matchers;
+using namespace clang::tooling;
+
+
+static llvm::cl::OptionCategory MatcherCategory("matcher options");
+
+StatementMatcher forCond = forStmt(
+                            hasLoopInit(
+                              declStmt(
+                                hasSingleDecl(
+                                  varDecl(
+                                    hasInitializer(
+                                      integerLiteral(
+                                        equals(0)))).bind("init_var")))));
+
+class MatchPrinter: public MatchFinder::MatchCallback {
+
+public:
+  virtual void run(const MatchFinder::MatchResult &Result) {
+    if (const clang::VarDecl *var = Result.Nodes.getNodeAs<clang::VarDecl>("init_var"))
+    	llvm::outs() << var-> getNameAsString();
+  }
+};
+
+
+int main(int argc, const char **argv) {
+  CommonOptionsParser OptionsParser(argc, argv, MatcherCategory);
+  ClangTool Matcher(OptionsParser.getCompilations(), OptionsParser.getSourcePathList());
+
+  MatchPrinter Printer; 
+  MatchFinder Finder;
+  Finder.addMatcher(traverse(clang::TK_IgnoreUnlessSpelledInSource, forCond), &Printer);
+  Matcher.run(newFrontendActionFactory(&Finder).get());
+
+  return 0;
+}
+
+
+// StatementMatcher forCond =  forStmt(hasCondition(
+//                        binaryOperator(
+//                             hasOperatorName("<"),
+//                                 hasLHS(ignoringParenImpCasts(declRefExpr(
+//                                    to(varDecl(hasType(isInteger())).bind("condVarName"))))),
+//                        hasRHS(
+//                            expr(
+//                              hasType(
+//                                isInteger())).bind("condValue")))));
+
+
+
+
+
+
+
+// int main(int argc, const char **argv) {
+//   CommonOptionsParser OptionsParser(argc, argv, MatcherCategory);
+//   ClangTool Matcher(OptionsParser.getCompilations(), OptionsParser.getSourcePathList());
+
+//   LoopPrinter Printer; 
+//   MatchFinder Finder;
+//   Finder.addMatcher(traverse(clang::TK_IgnoreUnlessSpelledInSource, forCond), &Printer);
+//   Matcher.run(newFrontendActionFactory(&Finder).get());
+
+//   return 0;
+// }

ast-matcher/setup

@@ -0,0 +1,24 @@
+#!/usr/bin/env zsh
+# =========================================================================== #
+
+llvmBuildDir="$HOME/repos/llvm-project/build"
+
+buildDir=$(realpath -L ./build)
+
+cc=$llvmBuildDir/bin/clang
+cxx=$llvmBuildDir/bin/clang++
+
+cmake -S . -B $buildDir -G "Ninja"              \
+    -DLLVM_DIR=${llvmBuildDir}/lib/cmake/llvm   \
+    -DClang_DIR=${llvmBuildDir}/lib/cmake/clang \
+    -DCMAKE_C_COMPILER=$cc                      \
+    -DCMAKE_CXX_COMPILER=$cxx                   \
+    -DCMAKE_EXPORT_COMPILE_COMMANDS=ON
+
+
+# --------------------------------------------------------------------------- #
+
+ninja -C $buildDir -j$(nproc)
+
+
+# =========================================================================== #