From 0b7fdca640f020f9b9de53401cc2c29b36748cf7 Mon Sep 17 00:00:00 2001
From: Artem Dergachev <artem.dergachev@gmail.com>
Date: Tue, 25 Sep 2018 22:13:31 +0000
Subject: [PATCH] [analyzer] NFC: CallDescription: Improve array management.

Combine the two constructor overrides into a single ArrayRef constructor
to allow easier brace initializations and simplify how the respective field
is used internally.

Differential Revision: https://reviews.llvm.org/D51390

llvm-svn: 343037
---
 .../StaticAnalyzer/Core/PathSensitive/CallEvent.h  | 23 ++++++----------------
 clang/lib/StaticAnalyzer/Core/CallEvent.cpp        | 17 +++++++++-------
 2 files changed, 16 insertions(+), 24 deletions(-)

diff --git a/clang/include/clang/StaticAnalyzer/Core/PathSensitive/CallEvent.h b/clang/include/clang/StaticAnalyzer/Core/PathSensitive/CallEvent.h
index f8b2cf7..4c50eaf 100644
--- a/clang/include/clang/StaticAnalyzer/Core/PathSensitive/CallEvent.h
+++ b/clang/include/clang/StaticAnalyzer/Core/PathSensitive/CallEvent.h
@@ -82,7 +82,7 @@ class CallDescription {
   mutable bool IsLookupDone = false;
   // The list of the qualified names used to identify the specified CallEvent,
   // e.g. "{a, b}" represent the qualified names, like "a::b".
-  std::vector<StringRef> QualifiedName;
+  std::vector<const char *> QualifiedName;
   unsigned RequiredArgs;
 
 public:
@@ -90,29 +90,18 @@ public:
 
   /// Constructs a CallDescription object.
   ///
-  /// @param QualifiedName The list of the qualified names of the function that
-  /// will be matched. It does not require the user to provide the full list of
-  /// the qualified name. The more details provided, the more accurate the
-  /// matching.
+  /// @param QualifiedName The list of the name qualifiers of the function that
+  /// will be matched. The user is allowed to skip any of the qualifiers.
+  /// For example, {"std", "basic_string", "c_str"} would match both
+  /// std::basic_string<...>::c_str() and std::__1::basic_string<...>::c_str().
   ///
   /// @param RequiredArgs The number of arguments that is expected to match a
   /// call. Omit this parameter to match every occurrence of call with a given
   /// name regardless the number of arguments.
-  CallDescription(std::vector<StringRef> QualifiedName,
+  CallDescription(ArrayRef<const char *> QualifiedName,
                   unsigned RequiredArgs = NoArgRequirement)
       : QualifiedName(QualifiedName), RequiredArgs(RequiredArgs) {}
 
-  /// Constructs a CallDescription object.
-  ///
-  /// @param FuncName The name of the function that will be matched.
-  ///
-  /// @param RequiredArgs The number of arguments that is expected to match a
-  /// call. Omit this parameter to match every occurrence of call with a given
-  /// name regardless the number of arguments.
-  CallDescription(StringRef FuncName, unsigned RequiredArgs = NoArgRequirement)
-      : CallDescription(std::vector<StringRef>({FuncName}), NoArgRequirement) {
-  }
-
   /// Get the name of the function that this object matches.
   StringRef getFunctionName() const { return QualifiedName.back(); }
 };
diff --git a/clang/lib/StaticAnalyzer/Core/CallEvent.cpp b/clang/lib/StaticAnalyzer/Core/CallEvent.cpp
index 3ba68d4..7b6a8d4 100644
--- a/clang/lib/StaticAnalyzer/Core/CallEvent.cpp
+++ b/clang/lib/StaticAnalyzer/Core/CallEvent.cpp
@@ -371,23 +371,26 @@ bool CallEvent::isCalled(const CallDescription &CD) const {
   // accuracy.
   if (CD.QualifiedName.size() > 1 && D) {
     const DeclContext *Ctx = D->getDeclContext();
-    std::vector<StringRef> QualifiedName = CD.QualifiedName;
-    QualifiedName.pop_back();
+    // See if we'll be able to match them all.
+    size_t NumUnmatched = CD.QualifiedName.size() - 1;
     for (; Ctx && isa<NamedDecl>(Ctx); Ctx = Ctx->getParent()) {
+      if (NumUnmatched == 0)
+        break;
+
       if (const auto *ND = dyn_cast<NamespaceDecl>(Ctx)) {
-        if (!QualifiedName.empty() && ND->getName() == QualifiedName.back())
-          QualifiedName.pop_back();
+        if (ND->getName() == CD.QualifiedName[NumUnmatched - 1])
+          --NumUnmatched;
         continue;
       }
 
       if (const auto *RD = dyn_cast<RecordDecl>(Ctx)) {
-        if (!QualifiedName.empty() && RD->getName() == QualifiedName.back())
-          QualifiedName.pop_back();
+        if (RD->getName() == CD.QualifiedName[NumUnmatched - 1])
+          --NumUnmatched;
         continue;
       }
     }
 
-    if (!QualifiedName.empty())
+    if (NumUnmatched > 0)
       return false;
   }
 
-- 
2.7.4