[PATCH] D126633: [pseudo] Use the pseudoCXX library in fuzzer.

[Haojian Wu via Phabricator via cfe-commits]

hokein created this revision.
hokein added a reviewer: sammccall.
Herald added a subscriber: mgorny.
Herald added a project: All.
hokein requested review of this revision.
Herald added a subscriber: alextsao1999.
Herald added a project: clang-tools-extra.

Get rid of the tedious grammar command-flag handling, and simply the
code.


Repository:
  rG LLVM Github Monorepo

https://reviews.llvm.org/D126633

Files:
  clang-tools-extra/pseudo/fuzzer/CMakeLists.txt
  clang-tools-extra/pseudo/fuzzer/Fuzzer.cpp


Index: clang-tools-extra/pseudo/fuzzer/Fuzzer.cpp
===================================================================
--- clang-tools-extra/pseudo/fuzzer/Fuzzer.cpp
+++ clang-tools-extra/pseudo/fuzzer/Fuzzer.cpp
@@ -12,6 +12,7 @@
 #include "clang-pseudo/Grammar.h"
 #include "clang-pseudo/LRTable.h"
 #include "clang-pseudo/Token.h"
+#include "clang-pseudo/cxx/CXX.h"
 #include "clang/Basic/LangOptions.h"
 #include "llvm/ADT/StringRef.h"
 #include "llvm/Support/MemoryBuffer.h"
@@ -24,28 +25,10 @@
 
 class Fuzzer {
   clang::LangOptions LangOpts = clang::pseudo::genericLangOpts();
-  std::unique_ptr<Grammar> G;
-  LRTable T;
   bool Print;
 
 public:
-  Fuzzer(llvm::StringRef GrammarPath, bool Print) : Print(Print) {
-    llvm::ErrorOr<std::unique_ptr<llvm::MemoryBuffer>> GrammarText =
-        llvm::MemoryBuffer::getFile(GrammarPath);
-    if (std::error_code EC = GrammarText.getError()) {
-      llvm::errs() << "Error: can't read grammar file '" << GrammarPath
-                   << "': " << EC.message() << "\n";
-      std::exit(1);
-    }
-    std::vector<std::string> Diags;
-    G = Grammar::parseBNF(GrammarText->get()->getBuffer(), Diags);
-    if (!Diags.empty()) {
-      for (const auto &Diag : Diags)
-        llvm::errs() << Diag << "\n";
-      std::exit(1);
-    }
-    T = LRTable::buildSLR(*G);
-  }
+  Fuzzer(bool Print) : Print(Print) {}
 
   void operator()(llvm::StringRef Code) {
     std::string CodeStr = Code.str(); // Must be null-terminated.
@@ -58,11 +41,13 @@
 
     clang::pseudo::ForestArena Arena;
     clang::pseudo::GSS GSS;
+    const auto &G = cxx::getGrammar();
+    const LRTable &T = cxx::getLRTable();
     auto &Root =
-        glrParse(ParseableStream, clang::pseudo::ParseParams{*G, T, Arena, GSS},
-                 *G->findNonterminal("translation-unit"));
+        glrParse(ParseableStream, clang::pseudo::ParseParams{G, T, Arena, GSS},
+                 static_cast<SymbolID>(cxx::Symbol::translation_unit));
     if (Print)
-      llvm::outs() << Root.dumpRecursive(*G);
+      llvm::outs() << Root.dumpRecursive(G);
   }
 };
 
@@ -78,13 +63,9 @@
 //  -grammar=<file> (required) - path to cxx.bnf
 //  -print                     - used for testing the fuzzer
 int LLVMFuzzerInitialize(int *Argc, char ***Argv) {
-  llvm::StringRef GrammarFile;
   bool PrintForest = false;
   auto ConsumeArg = [&](llvm::StringRef Arg) -> bool {
-    if (Arg.consume_front("-grammar=")) {
-      GrammarFile = Arg;
-      return true;
-    } else if (Arg == "-print") {
+    if (Arg == "-print") {
       PrintForest = true;
       return true;
     }
@@ -92,11 +73,7 @@
   };
   *Argc = std::remove_if(*Argv + 1, *Argv + *Argc, ConsumeArg) - *Argv;
 
-  if (GrammarFile.empty()) {
-    fprintf(stderr, "Fuzzer needs -grammar=/path/to/cxx.bnf\n");
-    exit(1);
-  }
-  clang::pseudo::Fuzz = new clang::pseudo::Fuzzer(GrammarFile, PrintForest);
+  clang::pseudo::Fuzz = new clang::pseudo::Fuzzer(PrintForest);
   return 0;
 }
 
Index: clang-tools-extra/pseudo/fuzzer/CMakeLists.txt
===================================================================
--- clang-tools-extra/pseudo/fuzzer/CMakeLists.txt
+++ clang-tools-extra/pseudo/fuzzer/CMakeLists.txt
@@ -11,5 +11,6 @@
 target_link_libraries(clang-pseudo-fuzzer
   PRIVATE
   clangPseudo
+  clangPseudoCXX
   clangPseudoGrammar
   )


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