From b60736ec1405bb0a8dd40989f67ef4c93da068ab Mon Sep 17 00:00:00 2001
From: Dimitry Andric <dim@FreeBSD.org>
Date: Tue, 16 Feb 2021 21:13:02 +0100
Subject: Vendor import of llvm-project main 8e464dd76bef, the last commit
 before the upstream release/12.x branch was created.

---
 clang/lib/Tooling/CompilationDatabase.cpp | 58 +++++++++++++------------------
 1 file changed, 24 insertions(+), 34 deletions(-)

(limited to 'clang/lib/Tooling/CompilationDatabase.cpp')

diff --git a/clang/lib/Tooling/CompilationDatabase.cpp b/clang/lib/Tooling/CompilationDatabase.cpp
index 2b4c26dab96f..1e19e68633d2 100644
--- a/clang/lib/Tooling/CompilationDatabase.cpp
+++ b/clang/lib/Tooling/CompilationDatabase.cpp
@@ -199,22 +199,6 @@ public:
   SmallVector<std::string, 2> UnusedInputs;
 };
 
-// Unary functor for asking "Given a StringRef S1, does there exist a string
-// S2 in Arr where S1 == S2?"
-struct MatchesAny {
-  MatchesAny(ArrayRef<std::string> Arr) : Arr(Arr) {}
-
-  bool operator() (StringRef S) {
-    for (const std::string *I = Arr.begin(), *E = Arr.end(); I != E; ++I)
-      if (*I == S)
-        return true;
-    return false;
-  }
-
-private:
-  ArrayRef<std::string> Arr;
-};
-
 // Filter of tools unused flags such as -no-integrated-as and -Wa,*.
 // They are not used for syntax checking, and could confuse targets
 // which don't support these options.
@@ -292,8 +276,7 @@ static bool stripPositionalArgs(std::vector<const char *> Args,
   // up with no jobs but then this is the user's fault.
   Args.push_back("placeholder.cpp");
 
-  Args.erase(std::remove_if(Args.begin(), Args.end(), FilterUnusedFlags()),
-             Args.end());
+  llvm::erase_if(Args, FilterUnusedFlags());
 
   const std::unique_ptr<driver::Compilation> Compilation(
       NewDriver->BuildCompilation(Args));
@@ -320,15 +303,14 @@ static bool stripPositionalArgs(std::vector<const char *> Args,
     return false;
   }
 
-  // Remove all compilation input files from the command line. This is
-  // necessary so that getCompileCommands() can construct a command line for
-  // each file.
-  std::vector<const char *>::iterator End = std::remove_if(
-      Args.begin(), Args.end(), MatchesAny(CompileAnalyzer.Inputs));
-
-  // Remove all inputs deemed unused for compilation.
-  End = std::remove_if(Args.begin(), End, MatchesAny(DiagClient.UnusedInputs));
-
+  // Remove all compilation input files from the command line and inputs deemed
+  // unused for compilation. This is necessary so that getCompileCommands() can
+  // construct a command line for each file.
+  std::vector<const char *>::iterator End =
+      llvm::remove_if(Args, [&](StringRef S) {
+        return llvm::is_contained(CompileAnalyzer.Inputs, S) ||
+               llvm::is_contained(DiagClient.UnusedInputs, S);
+      });
   // Remove the -c add above as well. It will be at the end right now.
   assert(strcmp(*(End - 1), "-c") == 0);
   --End;
@@ -341,7 +323,7 @@ std::unique_ptr<FixedCompilationDatabase>
 FixedCompilationDatabase::loadFromCommandLine(int &Argc,
                                               const char *const *Argv,
                                               std::string &ErrorMsg,
-                                              Twine Directory) {
+                                              const Twine &Directory) {
   ErrorMsg.clear();
   if (Argc == 0)
     return nullptr;
@@ -366,20 +348,28 @@ FixedCompilationDatabase::loadFromFile(StringRef Path, std::string &ErrorMsg) {
     ErrorMsg = "Error while opening fixed database: " + Result.message();
     return nullptr;
   }
+  return loadFromBuffer(llvm::sys::path::parent_path(Path),
+                        (*File)->getBuffer(), ErrorMsg);
+}
+
+std::unique_ptr<FixedCompilationDatabase>
+FixedCompilationDatabase::loadFromBuffer(StringRef Directory, StringRef Data,
+                                         std::string &ErrorMsg) {
+  ErrorMsg.clear();
   std::vector<std::string> Args;
-  for (llvm::StringRef Line :
-       llvm::make_range(llvm::line_iterator(**File), llvm::line_iterator())) {
+  StringRef Line;
+  while (!Data.empty()) {
+    std::tie(Line, Data) = Data.split('\n');
     // Stray whitespace is almost certainly unintended.
     Line = Line.trim();
     if (!Line.empty())
       Args.push_back(Line.str());
   }
-  return std::make_unique<FixedCompilationDatabase>(
-      llvm::sys::path::parent_path(Path), std::move(Args));
+  return std::make_unique<FixedCompilationDatabase>(Directory, std::move(Args));
 }
 
-FixedCompilationDatabase::
-FixedCompilationDatabase(Twine Directory, ArrayRef<std::string> CommandLine) {
+FixedCompilationDatabase::FixedCompilationDatabase(
+    const Twine &Directory, ArrayRef<std::string> CommandLine) {
   std::vector<std::string> ToolCommandLine(1, GetClangToolCommand());
   ToolCommandLine.insert(ToolCommandLine.end(),
                          CommandLine.begin(), CommandLine.end());
-- 
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