[analyzer] Add basic support for pluggable checkers.

git-svn-id: https://llvm.org/svn/llvm-project/cfe/trunk@137802 91177308-0d34-0410-b5e6-96231b3b80d8

3 files changed, 86 insertions, 0 deletions

diff --git a/examples/analyzer-plugin/CMakeLists.txt b/examples/analyzer-plugin/CMakeLists.txt
new file mode 100644
index 0000000000..865422684c
--- /dev/null
+++ b/examples/analyzer-plugin/CMakeLists.txt
@@ -0,0 +1,14 @@
+set(MODULE TRUE)
+
+set( LLVM_USED_LIBS
+  clangStaticAnalyzerCore
+  )
+
+set( LLVM_LINK_COMPONENTS support mc)
+
+add_clang_library(SampleAnalyzerPlugin SampleAnalyzerPlugin)
+
+set_target_properties(SampleAnalyzerPlugin
+  PROPERTIES
+  LINKER_LANGUAGE CXX
+  PREFIX "")
diff --git a/examples/analyzer-plugin/MainCallChecker.cpp b/examples/analyzer-plugin/MainCallChecker.cpp
new file mode 100644
index 0000000000..bf753899c2
--- /dev/null
+++ b/examples/analyzer-plugin/MainCallChecker.cpp
@@ -0,0 +1,52 @@
+#include "clang/StaticAnalyzer/Core/Checker.h"
+#include "clang/StaticAnalyzer/Core/PathSensitive/CheckerContext.h"
+#include "clang/StaticAnalyzer/Core/CheckerRegistry.h"
+#include "clang/StaticAnalyzer/Core/BugReporter/BugType.h"
+
+using namespace clang;
+using namespace ento;
+
+namespace {
+class MainCallChecker : public Checker < check::PreStmt<CallExpr> > {
+  mutable llvm::OwningPtr<BugType> BT;
+
+public:
+  void checkPreStmt(const CallExpr *CE, CheckerContext &C) const;
+};
+} // end anonymous namespace
+
+void MainCallChecker::checkPreStmt(const CallExpr *CE, CheckerContext &C) const {
+  const ProgramState *state = C.getState();
+  const Expr *Callee = CE->getCallee();
+  const FunctionDecl *FD = state->getSVal(Callee).getAsFunctionDecl();
+
+  if (!FD)
+    return;
+
+  // Get the name of the callee.
+  IdentifierInfo *II = FD->getIdentifier();
+  if (!II)   // if no identifier, not a simple C function
+    return;
+
+  if (II->isStr("main")) {
+    ExplodedNode *N = C.generateSink();
+    if (!N)
+      return;
+
+    if (!BT)
+      BT.reset(new BuiltinBug("call to main"));
+
+    RangedBugReport *report = new RangedBugReport(*BT, BT->getName(), N);
+    report->addRange(Callee->getSourceRange());
+    C.EmitReport(report);    
+  }
+}
+
+// Register plugin!
+extern "C"
+void clang_registerCheckers (CheckerRegistry &registry) {
+  registry.addChecker<MainCallChecker>("example.MainCallChecker", "Disallows calls to functions called main");
+}
+
+extern "C"
+const char clang_analyzerAPIVersionString[] = CLANG_ANALYZER_API_VERSION_STRING;
diff --git a/examples/analyzer-plugin/Makefile b/examples/analyzer-plugin/Makefile
new file mode 100644
index 0000000000..5537ee03d8
--- /dev/null
+++ b/examples/analyzer-plugin/Makefile
@@ -0,0 +1,20 @@
+##===- examples/analyzer-plugin/Makefile -------------------*- Makefile -*-===##
+# 
+#                     The LLVM Compiler Infrastructure
+#
+# This file is distributed under the University of Illinois Open Source
+# License. See LICENSE.TXT for details.
+# 
+##===----------------------------------------------------------------------===##
+
+CLANG_LEVEL := ../..
+LIBRARYNAME = SampleAnalyzerPlugin
+
+LINK_LIBS_IN_SHARED = 0
+SHARED_LIBRARY = 1
+
+include $(CLANG_LEVEL)/Makefile
+
+ifeq ($(OS),Darwin)
+  LDFLAGS=-Wl,-undefined,dynamic_lookup
+endif