vendor/clang/clang-trunk-r154661

1 files changed, 230 insertions, 0 deletions

diff --git a/lib/Tooling/CompilationDatabase.cpp b/lib/Tooling/CompilationDatabase.cpp
new file mode 100644
index 000000000000..eea1055f491c
--- /dev/null
+++ b/lib/Tooling/CompilationDatabase.cpp
@@ -0,0 +1,230 @@
+//===--- CompilationDatabase.cpp - ----------------------------------------===//
+//
+//                     The LLVM Compiler Infrastructure
+//
+// This file is distributed under the University of Illinois Open Source
+// License. See LICENSE.TXT for details.
+//
+//===----------------------------------------------------------------------===//
+//
+//  This file contains multiple implementations for CompilationDatabases.
+//
+//===----------------------------------------------------------------------===//
+
+#include "clang/Tooling/CompilationDatabase.h"
+#include "llvm/ADT/SmallString.h"
+#include "llvm/Support/JSONParser.h"
+#include "llvm/Support/Path.h"
+#include "llvm/Support/system_error.h"
+
+namespace clang {
+namespace tooling {
+
+namespace {
+
+/// \brief A parser for JSON escaped strings of command line arguments.
+///
+/// Assumes \-escaping for quoted arguments (see the documentation of
+/// unescapeJSONCommandLine(...)).
+class CommandLineArgumentParser {
+ public:
+  CommandLineArgumentParser(StringRef CommandLine)
+      : Input(CommandLine), Position(Input.begin()-1) {}
+
+  std::vector<std::string> parse() {
+    bool HasMoreInput = true;
+    while (HasMoreInput && nextNonWhitespace()) {
+      std::string Argument;
+      HasMoreInput = parseStringInto(Argument);
+      CommandLine.push_back(Argument);
+    }
+    return CommandLine;
+  }
+
+ private:
+  // All private methods return true if there is more input available.
+
+  bool parseStringInto(std::string &String) {
+    do {
+      if (*Position == '"') {
+        if (!parseQuotedStringInto(String)) return false;
+      } else {
+        if (!parseFreeStringInto(String)) return false;
+      }
+    } while (*Position != ' ');
+    return true;
+  }
+
+  bool parseQuotedStringInto(std::string &String) {
+    if (!next()) return false;
+    while (*Position != '"') {
+      if (!skipEscapeCharacter()) return false;
+      String.push_back(*Position);
+      if (!next()) return false;
+    }
+    return next();
+  }
+
+  bool parseFreeStringInto(std::string &String) {
+    do {
+      if (!skipEscapeCharacter()) return false;
+      String.push_back(*Position);
+      if (!next()) return false;
+    } while (*Position != ' ' && *Position != '"');
+    return true;
+  }
+
+  bool skipEscapeCharacter() {
+    if (*Position == '\\') {
+      return next();
+    }
+    return true;
+  }
+
+  bool nextNonWhitespace() {
+    do {
+      if (!next()) return false;
+    } while (*Position == ' ');
+    return true;
+  }
+
+  bool next() {
+    ++Position;
+    if (Position == Input.end()) return false;
+    // Remove the JSON escaping first. This is done unconditionally.
+    if (*Position == '\\') ++Position;
+    return Position != Input.end();
+  }
+
+  const StringRef Input;
+  StringRef::iterator Position;
+  std::vector<std::string> CommandLine;
+};
+
+std::vector<std::string> unescapeJSONCommandLine(
+    StringRef JSONEscapedCommandLine) {
+  CommandLineArgumentParser parser(JSONEscapedCommandLine);
+  return parser.parse();
+}
+
+} // end namespace
+
+CompilationDatabase::~CompilationDatabase() {}
+
+CompilationDatabase *
+CompilationDatabase::loadFromDirectory(StringRef BuildDirectory,
+                                       std::string &ErrorMessage) {
+  llvm::SmallString<1024> JSONDatabasePath(BuildDirectory);
+  llvm::sys::path::append(JSONDatabasePath, "compile_commands.json");
+  llvm::OwningPtr<CompilationDatabase> Database(
+    JSONCompilationDatabase::loadFromFile(JSONDatabasePath, ErrorMessage));
+  if (!Database) {
+    return NULL;
+  }
+  return Database.take();
+}
+
+JSONCompilationDatabase *
+JSONCompilationDatabase::loadFromFile(StringRef FilePath,
+                                      std::string &ErrorMessage) {
+  llvm::OwningPtr<llvm::MemoryBuffer> DatabaseBuffer;
+  llvm::error_code Result =
+    llvm::MemoryBuffer::getFile(FilePath, DatabaseBuffer);
+  if (Result != 0) {
+    ErrorMessage = "Error while opening JSON database: " + Result.message();
+    return NULL;
+  }
+  llvm::OwningPtr<JSONCompilationDatabase> Database(
+    new JSONCompilationDatabase(DatabaseBuffer.take()));
+  if (!Database->parse(ErrorMessage))
+    return NULL;
+  return Database.take();
+}
+
+JSONCompilationDatabase *
+JSONCompilationDatabase::loadFromBuffer(StringRef DatabaseString,
+                                        std::string &ErrorMessage) {
+  llvm::OwningPtr<llvm::MemoryBuffer> DatabaseBuffer(
+      llvm::MemoryBuffer::getMemBuffer(DatabaseString));
+  llvm::OwningPtr<JSONCompilationDatabase> Database(
+    new JSONCompilationDatabase(DatabaseBuffer.take()));
+  if (!Database->parse(ErrorMessage))
+    return NULL;
+  return Database.take();
+}
+
+std::vector<CompileCommand>
+JSONCompilationDatabase::getCompileCommands(StringRef FilePath) const {
+  llvm::StringMap< std::vector<CompileCommandRef> >::const_iterator
+    CommandsRefI = IndexByFile.find(FilePath);
+  if (CommandsRefI == IndexByFile.end())
+    return std::vector<CompileCommand>();
+  const std::vector<CompileCommandRef> &CommandsRef = CommandsRefI->getValue();
+  std::vector<CompileCommand> Commands;
+  for (int I = 0, E = CommandsRef.size(); I != E; ++I) {
+    Commands.push_back(CompileCommand(
+      // FIXME: Escape correctly:
+      CommandsRef[I].first,
+      unescapeJSONCommandLine(CommandsRef[I].second)));
+  }
+  return Commands;
+}
+
+bool JSONCompilationDatabase::parse(std::string &ErrorMessage) {
+  llvm::SourceMgr SM;
+  llvm::JSONParser Parser(Database->getBuffer(), &SM);
+  llvm::JSONValue *Root = Parser.parseRoot();
+  if (Root == NULL) {
+    ErrorMessage = "Error while parsing JSON.";
+    return false;
+  }
+  llvm::JSONArray *Array = dyn_cast<llvm::JSONArray>(Root);
+  if (Array == NULL) {
+    ErrorMessage = "Expected array.";
+    return false;
+  }
+  for (llvm::JSONArray::const_iterator AI = Array->begin(), AE = Array->end();
+       AI != AE; ++AI) {
+    const llvm::JSONObject *Object = dyn_cast<llvm::JSONObject>(*AI);
+    if (Object == NULL) {
+      ErrorMessage = "Expected object.";
+      return false;
+    }
+    StringRef EntryDirectory;
+    StringRef EntryFile;
+    StringRef EntryCommand;
+    for (llvm::JSONObject::const_iterator KVI = Object->begin(),
+                                          KVE = Object->end();
+         KVI != KVE; ++KVI) {
+      const llvm::JSONValue *Value = (*KVI)->Value;
+      if (Value == NULL) {
+        ErrorMessage = "Expected value.";
+        return false;
+      }
+      const llvm::JSONString *ValueString =
+        dyn_cast<llvm::JSONString>(Value);
+      if (ValueString == NULL) {
+        ErrorMessage = "Expected string as value.";
+        return false;
+      }
+      if ((*KVI)->Key->getRawText() == "directory") {
+        EntryDirectory = ValueString->getRawText();
+      } else if ((*KVI)->Key->getRawText() == "file") {
+        EntryFile = ValueString->getRawText();
+      } else if ((*KVI)->Key->getRawText() == "command") {
+        EntryCommand = ValueString->getRawText();
+      } else {
+        ErrorMessage = (Twine("Unknown key: \"") +
+                        (*KVI)->Key->getRawText() + "\"").str();
+        return false;
+      }
+    }
+    IndexByFile[EntryFile].push_back(
+      CompileCommandRef(EntryDirectory, EntryCommand));
+  }
+  return true;
+}
+
+} // end namespace tooling
+} // end namespace clang
+