clang-ast: add tool that uses libclang to output ast for a file

tools/clang-ast.cpp

@@ -0,0 +1,90 @@
+// Dump the AST for a file.
+//
+// Compile with:
+// g++ `llvm-config-3.8 --cxxflags --ldflags` -lclang -o clang-ast clang-ast.cpp
+
+#include <iostream>
+#include <cstdlib>
+#include <clang-c/Index.h>
+
+std::ostream& operator<<(std::ostream& stream, const CXString& str)
+{
+    stream << clang_getCString(str);
+    clang_disposeString(str);
+    return stream;
+}
+
+int main(int argc, char **argv)
+{
+    CXIndex index = clang_createIndex(0, 0);
+    CXTranslationUnit unit = clang_parseTranslationUnit(
+                                 index,
+                                 "file1.cpp", argv, argc,
+                                 nullptr, 0,
+                                 CXTranslationUnit_None);
+    if (unit == nullptr) {
+        std::cerr << "Unable to parse translation unit. Quitting." << std::endl;
+        return EXIT_FAILURE;
+    }
+
+    std::cout << "<?xml version=\"1.0\"?>\n"
+              << "<clang-ast>\n";
+
+    CXCursor cursor = clang_getTranslationUnitCursor(unit);
+    clang_visitChildren(
+        cursor,
+    [](CXCursor c, CXCursor parent, CXClientData client_data) {
+        switch (clang_getCursorKind(c)) {
+        case CXCursor_FunctionDecl: {
+            CXSourceLocation location = clang_getCursorLocation(c);
+            CXString filename;
+            unsigned int line, column;
+            clang_getPresumedLocation(location, &filename, &line, &column);
+
+            std::cout << "<FunctionDecl"
+                      << " name=\"" << clang_getCursorSpelling(c) << '\"'
+                      << " filename=\"" << filename << '\"'
+                      << " line=\"" << line << '\"'
+//                        << " column=\"" << column << '\"'
+                      << "/>\n";
+            break;
+        }
+
+        case CXCursor_CallExpr: {
+            CXSourceLocation location = clang_getCursorLocation(c);
+            CXString filename;
+            unsigned int line, column;
+            clang_getPresumedLocation(location, &filename, &line, &column);
+
+            CXCursor ref = clang_getCursorReferenced(c);
+            CXSourceLocation locationRef = clang_getCursorLocation(ref);
+            CXString filenameRef;
+            unsigned int lineRef, columnRef;
+            clang_getPresumedLocation(locationRef, &filenameRef, &lineRef, &columnRef);
+
+            std::cout << "<CallExpr"
+                      << " name=\"" << clang_getCursorSpelling(c) << '\"'
+                      << " filename=\"" << filename << '\"'
+                      << " line=\"" << line << '\"'
+//                        << " column=\"" << column << '\"'
+                      << " filenameRef=\"" << filenameRef << '\"'
+                      << " lineRef=\"" << lineRef << '\"'
+                      << "/>\n";
+            break;
+        }
+        break;
+        default:
+            break;
+        };
+
+        return CXChildVisit_Recurse;
+    },
+    nullptr);
+
+    std::cout << "</clang-ast>\n";
+
+    clang_disposeTranslationUnit(unit);
+    clang_disposeIndex(index);
+
+    return EXIT_SUCCESS;
+}