[cte][NFC] Remove all references to stdlib stream headers.

[njames93]

Summary

Inclusion of iostream is frobidden and using other stream classes from standard library is discouraged as per https://llvm.org/docs/CodingStandards.html#include-iostream-is-forbidden

[aaron.ballman]

clang-tools-extra/clangd/benchmarks/IndexBenchmark.cpp

38

[sammccall]

LGTM (apart from Aaron's comment!)

[njames93]

clang-tools-extra/clangd/benchmarks/IndexBenchmark.cpp

38

Duh 🙄

clang-tools-extra/clang-query/tool/ClangQuery.cpp

 #include "Query.h"
 #include "QueryParser.h"
 #include "QuerySession.h"
 #include "clang/Frontend/ASTUnit.h"
 #include "clang/Tooling/CommonOptionsParser.h"
 #include "clang/Tooling/Tooling.h"
 #include "llvm/LineEditor/LineEditor.h"
 #include "llvm/Support/CommandLine.h"
+#include "llvm/Support/Error.h"
 #include "llvm/Support/MemoryBuffer.h"
 #include "llvm/Support/Signals.h"
 #include "llvm/Support/WithColor.h"
-#include <fstream>
 #include <string>
 
 using namespace clang;
 using namespace clang::ast_matchers;
 using namespace clang::ast_matchers::dynamic;
 using namespace clang::query;
 using namespace clang::tooling;
 using namespace llvm;

 
 static cl::opt<std::string> PreloadFile(
     "preload",
     cl::desc("Preload commands from file and start interactive mode"),
     cl::value_desc("file"), cl::cat(ClangQueryCategory));
 
 bool runCommandsInFile(const char *ExeName, std::string const &FileName,
                        QuerySession &QS) {
-  std::ifstream Input(FileName.c_str());
-  if (!Input.is_open()) {
-    llvm::errs() << ExeName << ": cannot open " << FileName << "\n";
-    return 1;
+  auto Buffer = llvm::MemoryBuffer::getFile(FileName);
+  if (!Buffer) {
+    llvm::errs() << ExeName << ": cannot open " << FileName << ": "
+                 << Buffer.getError().message() << "\n";
+    return true;
   }
 
-  std::string FileContent((std::istreambuf_iterator<char>(Input)),
-                          std::istreambuf_iterator<char>());
+  StringRef FileContentRef(Buffer.get()->getBuffer());
 
-  StringRef FileContentRef(FileContent);
   while (!FileContentRef.empty()) {
     QueryRef Q = QueryParser::parse(FileContentRef, QS);
     if (!Q->run(llvm::outs(), QS))
       return true;
     FileContentRef = Q->RemainingContent;
   }
   return false;
 }

clang-tools-extra/clang-tidy/altera/StructPackAlignCheck.cpp

 //===--- StructPackAlignCheck.cpp - clang-tidy ----------------------------===//
 //
 // Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
 // See https://llvm.org/LICENSE.txt for license information.
 // SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 
 #include "StructPackAlignCheck.h"
 #include "clang/AST/ASTContext.h"
 #include "clang/AST/RecordLayout.h"
 #include "clang/ASTMatchers/ASTMatchFinder.h"
 #include <math.h>
-#include <sstream>
 
 using namespace clang::ast_matchers;
 
 namespace clang {
 namespace tidy {
 namespace altera {
 
 void StructPackAlignCheck::registerMatchers(MatchFinder *Finder) {
diag(Struct->getLocation(),
          DiagnosticIDs::Note)
         << Struct;
   }
 
   FixItHint FixIt;
   AlignedAttr *Attribute = Struct->getAttr<AlignedAttr>();
   std::string NewAlignQuantity = std::to_string((int)NewAlign.getQuantity());
   if (Attribute) {
-    std::ostringstream FixItString;
-    FixItString << "aligned(" << NewAlignQuantity << ")";
-    FixIt =
-        FixItHint::CreateReplacement(Attribute->getRange(), FixItString.str());
+    FixIt = FixItHint::CreateReplacement(
+        Attribute->getRange(),
+        (Twine("aligned(") + NewAlignQuantity + ")").str());
   } else {
-    std::ostringstream FixItString;
-    FixItString << " __attribute__((aligned(" << NewAlignQuantity << ")))";
-    FixIt = FixItHint::CreateInsertion(Struct->getEndLoc().getLocWithOffset(1),
-                                       FixItString.str());
+    FixIt = FixItHint::CreateInsertion(
+        Struct->getEndLoc().getLocWithOffset(1),
+        (Twine(" __attribute__((aligned(") + NewAlignQuantity + ")))").str());
   }
 
   // And suggest the minimum power-of-two alignment for the struct as a whole
   // (with and without packing).
   if (NeedsAlignment) {
     diag(Struct->getLocation(),
          "accessing fields in struct %0 is inefficient due to poor alignment; "
          "currently aligned to %1 bytes, but recommended alignment is %2 bytes")

clang-tools-extra/clang-tidy/readability/InconsistentDeclarationParameterNameCheck.cpp

 //===--- InconsistentDeclarationParameterNameCheck.cpp - clang-tidy-------===//
 //
 // Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
 // See https://llvm.org/LICENSE.txt for license information.
 // SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 
 #include "InconsistentDeclarationParameterNameCheck.h"
 #include "clang/AST/ASTContext.h"
 #include "clang/ASTMatchers/ASTMatchFinder.h"
 
 #include <algorithm>
 #include <functional>
-#include <sstream>
 
 using namespace clang::ast_matchers;
 
 namespace clang {
 namespace tidy {
 namespace readability {
 
 namespace {

clang-tools-extra/clangd/benchmarks/IndexBenchmark.cpp

 //===--- IndexBenchmark.cpp - Clangd index benchmarks -----------*- C++ -*-===//
 //
 // Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
 // See https://llvm.org/LICENSE.txt for license information.
 // SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 
 #include "../index/Serialization.h"
 #include "../index/dex/Dex.h"
 #include "benchmark/benchmark.h"
 #include "llvm/ADT/SmallVector.h"
 #include "llvm/ADT/StringRef.h"
 #include "llvm/Support/Path.h"
 #include "llvm/Support/Regex.h"
-#include <fstream>
-#include <streambuf>
 #include <string>
 
 const char *IndexFilename;
 const char *RequestsFilename;
 
 namespace clang {
 namespace clangd {
 namespace {
 
 std::unique_ptr<SymbolIndex> buildMem() {
   return loadIndex(IndexFilename, /*UseDex=*/false);
 }
 
 std::unique_ptr<SymbolIndex> buildDex() {
   return loadIndex(IndexFilename, /*UseDex=*/true);
 }
 
 // Reads JSON array of serialized FuzzyFindRequest's from user-provided file.
 std::vector<FuzzyFindRequest> extractQueriesFromLogs() {
-  std::ifstream InputStream(RequestsFilename);
-  std::string Log((std::istreambuf_iterator<char>(InputStream)),
-                  std::istreambuf_iterator<char>());
+
+  auto Buffer = llvm::MemoryBuffer::getFile(RequestsFilename);
+  if (!Buffer) {
+    llvm::errs() << "Error cannot open JSON request file:" << RequestsFilename
+                 << ": " << Buffer.getError().message() << "\n";
+    exit(1);
+  }
+
+  StringRef Log = Buffer.get()->getBuffer();
 
   std::vector<FuzzyFindRequest> Requests;
   auto JSONArray = llvm::json::parse(Log);
 
   // Panic if the provided file couldn't be parsed.
   if (!JSONArray) {
     llvm::errs() << "Error when parsing JSON requests file: "
                  << llvm::toString(JSONArray.takeError());

clang-tools-extra/clangd/fuzzer/clangd-fuzzer.cpp

 /// This function is then linked into the Fuzzer library.
 ///
 //===----------------------------------------------------------------------===//
 
 #include "ClangdLSPServer.h"
 #include "ClangdServer.h"
 #include "support/ThreadsafeFS.h"
 #include <cstdio>
-#include <sstream>
 
 using namespace clang::clangd;
 
 extern "C" int LLVMFuzzerTestOneInput(uint8_t *data, size_t size) {
   if (size == 0)
     return 0;
 
   // fmemopen isn't portable, but I think we only run the fuzzer on Linux.

clang-tools-extra/clangd/tool/ClangdMain.cpp

 #include "llvm/Support/Path.h"
 #include "llvm/Support/Process.h"
 #include "llvm/Support/Program.h"
 #include "llvm/Support/Signals.h"
 #include "llvm/Support/TargetSelect.h"
 #include "llvm/Support/raw_ostream.h"
 #include <chrono>
 #include <cstdlib>
-#include <iostream>
 #include <memory>
 #include <mutex>
 #include <string>
 #include <thread>
 #include <vector>
 
 #ifndef _WIN32
 #include <unistd.h>

clang-tools-extra/modularize/Modularize.cpp

 #include "llvm/Option/ArgList.h"
 #include "llvm/Option/OptTable.h"
 #include "llvm/Option/Option.h"
 #include "llvm/Support/CommandLine.h"
 #include "llvm/Support/FileSystem.h"
 #include "llvm/Support/MemoryBuffer.h"
 #include "llvm/Support/Path.h"
 #include <algorithm>
-#include <fstream>
 #include <iterator>
 #include <string>
 #include <vector>
 
 using namespace clang;
 using namespace clang::driver;
 using namespace clang::driver::options;
 using namespace clang::tooling;