From 9b509bca858cbc37ab8e36383f2550d5e2f8a312 Mon Sep 17 00:00:00 2001
From: Kadir Cetinkaya <kadircet@google.com>
Date: Wed, 6 May 2020 13:16:50 +0200
Subject: [PATCH] Revert "[clangd] Handle PresumedLocations in
 IncludeCollector"

This reverts commit 4f7917c269d65cd3c85eddee19385861c4b8390c as it is
breaking windows build bots.
---
 clang-tools-extra/clangd/Headers.cpp          | 56 +------------------
 .../clangd/unittests/HeadersTests.cpp         | 23 --------
 2 files changed, 3 insertions(+), 76 deletions(-)

diff --git a/clang-tools-extra/clangd/Headers.cpp b/clang-tools-extra/clangd/Headers.cpp
index ffd6bd1dd6cc..50c375988f7b 100644
--- a/clang-tools-extra/clangd/Headers.cpp
+++ b/clang-tools-extra/clangd/Headers.cpp
@@ -10,8 +10,6 @@
 #include "Compiler.h"
 #include "SourceCode.h"
 #include "support/Logger.h"
-#include "clang/Basic/SourceLocation.h"
-#include "clang/Basic/SourceManager.h"
 #include "clang/Frontend/CompilerInstance.h"
 #include "clang/Frontend/CompilerInvocation.h"
 #include "clang/Frontend/FrontendActions.h"
@@ -23,11 +21,6 @@ namespace clang {
 namespace clangd {
 namespace {
 
-bool isMainFile(llvm::StringRef FileName, const SourceManager &SM) {
-  auto FE = SM.getFileManager().getFile(FileName);
-  return FE && *FE == SM.getFileEntryForID(SM.getMainFileID());
-}
-
 class RecordHeaders : public PPCallbacks {
 public:
   RecordHeaders(const SourceManager &SM, IncludeStructure *Out)
@@ -37,27 +30,11 @@ public:
   // in the main file are collected.
   void InclusionDirective(SourceLocation HashLoc, const Token &IncludeTok,
                           llvm::StringRef FileName, bool IsAngled,
-                          CharSourceRange /*FilenameRange*/,
-                          const FileEntry *File, llvm::StringRef /*SearchPath*/,
+                          CharSourceRange FilenameRange, const FileEntry *File,
+                          llvm::StringRef /*SearchPath*/,
                           llvm::StringRef /*RelativePath*/,
                           const Module * /*Imported*/,
                           SrcMgr::CharacteristicKind FileKind) override {
-    auto MainFID = SM.getMainFileID();
-    // If an include is part of the preamble patch, translate #line directives.
-    if (InBuiltinFile) {
-      auto Presumed = SM.getPresumedLoc(HashLoc);
-      // Presumed locations will have an invalid file id when #line directive
-      // changes the filename.
-      if (Presumed.getFileID().isInvalid() &&
-          isMainFile(Presumed.getFilename(), SM)) {
-        // Now we'll hit the case below.
-        HashLoc = SM.translateLineCol(MainFID, Presumed.getLine(),
-                                      Presumed.getColumn());
-      }
-    }
-
-    // Record main-file inclusions (including those mapped from the preamble
-    // patch).
     if (isInsideMainFile(HashLoc, SM)) {
       Out->MainFileIncludes.emplace_back();
       auto &Inc = Out->MainFileIncludes.back();
@@ -70,48 +47,21 @@ public:
       Inc.FileKind = FileKind;
       Inc.Directive = IncludeTok.getIdentifierInfo()->getPPKeywordID();
     }
-
-    // Record include graph (not just for main-file includes)
     if (File) {
       auto *IncludingFileEntry = SM.getFileEntryForID(SM.getFileID(HashLoc));
       if (!IncludingFileEntry) {
         assert(SM.getBufferName(HashLoc).startswith("<") &&
                "Expected #include location to be a file or <built-in>");
         // Treat as if included from the main file.
-        IncludingFileEntry = SM.getFileEntryForID(MainFID);
+        IncludingFileEntry = SM.getFileEntryForID(SM.getMainFileID());
       }
       Out->recordInclude(IncludingFileEntry->getName(), File->getName(),
                          File->tryGetRealPathName());
     }
   }
 
-  void FileChanged(SourceLocation Loc, FileChangeReason Reason,
-                   SrcMgr::CharacteristicKind FileType,
-                   FileID PrevFID) override {
-    switch (Reason) {
-    case PPCallbacks::EnterFile:
-      if (BuiltinFile.isInvalid() && SM.isWrittenInBuiltinFile(Loc)) {
-        BuiltinFile = SM.getFileID(Loc);
-        InBuiltinFile = true;
-      }
-      break;
-    case PPCallbacks::ExitFile:
-      if (PrevFID == BuiltinFile)
-        InBuiltinFile = false;
-      break;
-    case PPCallbacks::RenameFile:
-    case PPCallbacks::SystemHeaderPragma:
-      break;
-    }
-  }
-
 private:
   const SourceManager &SM;
-  // Set after entering the <built-in> file.
-  FileID BuiltinFile;
-  // Indicates whether <built-in> file is part of include stack.
-  bool InBuiltinFile = false;
-
   IncludeStructure *Out;
 };
 
diff --git a/clang-tools-extra/clangd/unittests/HeadersTests.cpp b/clang-tools-extra/clangd/unittests/HeadersTests.cpp
index b40d883186b2..a6464c64fd28 100644
--- a/clang-tools-extra/clangd/unittests/HeadersTests.cpp
+++ b/clang-tools-extra/clangd/unittests/HeadersTests.cpp
@@ -16,7 +16,6 @@
 #include "clang/Frontend/CompilerInvocation.h"
 #include "clang/Frontend/FrontendActions.h"
 #include "clang/Lex/PreprocessorOptions.h"
-#include "llvm/Support/FormatVariadic.h"
 #include "llvm/Support/Path.h"
 #include "gmock/gmock.h"
 #include "gtest/gtest.h"
@@ -26,9 +25,7 @@ namespace clangd {
 namespace {
 
 using ::testing::AllOf;
-using ::testing::Contains;
 using ::testing::ElementsAre;
-using ::testing::Not;
 using ::testing::UnorderedElementsAre;
 
 class HeadersTest : public ::testing::Test {
@@ -305,26 +302,6 @@ TEST(Headers, NoHeaderSearchInfo) {
             llvm::None);
 }
 
-TEST_F(HeadersTest, PresumedLocations) {
-  std::string HeaderFile = "implicit_include.h";
-
-  // Line map inclusion back to main file.
-  std::string HeaderContents = llvm::formatv("#line 0 \"{0}\"", MainFile);
-  HeaderContents += R"cpp(
-#line 3
-#include <a.h>)cpp";
-  FS.Files[HeaderFile] = HeaderContents;
-
-  // Including through non-builtin file has no effects.
-  FS.Files[MainFile] = "#include \"implicit_include.h\"\n\n";
-  EXPECT_THAT(collectIncludes().MainFileIncludes,
-              Not(Contains(Written("<a.h>"))));
-
-  // Now include through built-in file.
-  CDB.ExtraClangFlags = {"-include", testPath(HeaderFile)};
-  EXPECT_THAT(collectIncludes().MainFileIncludes,
-              Contains(AllOf(IncludeLine(2), Written("<a.h>"))));
-}
 } // namespace
 } // namespace clangd
 } // namespace clang