Ninja
msvc_helper.h
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00001 // Copyright 2011 Google Inc. All Rights Reserved.
00002 //
00003 // Licensed under the Apache License, Version 2.0 (the "License");
00004 // you may not use this file except in compliance with the License.
00005 // You may obtain a copy of the License at
00006 //
00007 //     http://www.apache.org/licenses/LICENSE-2.0
00008 //
00009 // Unless required by applicable law or agreed to in writing, software
00010 // distributed under the License is distributed on an "AS IS" BASIS,
00011 // WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
00012 // See the License for the specific language governing permissions and
00013 // limitations under the License.
00014 
00015 #include <string>
00016 #include <set>
00017 #include <vector>
00018 using namespace std;
00019 
00020 string EscapeForDepfile(const string& path);
00021 
00022 /// Visual Studio's cl.exe requires some massaging to work with Ninja;
00023 /// for example, it emits include information on stderr in a funny
00024 /// format when building with /showIncludes.  This class parses this
00025 /// output.
00026 struct CLParser {
00027   /// Parse a line of cl.exe output and extract /showIncludes info.
00028   /// If a dependency is extracted, returns a nonempty string.
00029   /// Exposed for testing.
00030   static string FilterShowIncludes(const string& line);
00031 
00032   /// Return true if a mentioned include file is a system path.
00033   /// Filtering these out reduces dependency information considerably.
00034   static bool IsSystemInclude(string path);
00035 
00036   /// Parse a line of cl.exe output and return true if it looks like
00037   /// it's printing an input filename.  This is a heuristic but it appears
00038   /// to be the best we can do.
00039   /// Exposed for testing.
00040   static bool FilterInputFilename(string line);
00041 
00042   /// Parse the full output of cl, returning the output (if any) that
00043   /// should printed.
00044   string Parse(const string& output);
00045 
00046   set<string> includes_;
00047 };
00048 
00049 /// Wraps a synchronous execution of a CL subprocess.
00050 struct CLWrapper {
00051   CLWrapper() : env_block_(NULL) {}
00052 
00053   /// Set the environment block (as suitable for CreateProcess) to be used
00054   /// by Run().
00055   void SetEnvBlock(void* env_block) { env_block_ = env_block; }
00056 
00057   /// Start a process and gather its raw output.  Returns its exit code.
00058   /// Crashes (calls Fatal()) on error.
00059   int Run(const string& command, string* output);
00060 
00061   void* env_block_;
00062 };