CMake/Source/cmcldeps.cxx

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// Copyright 2011 Google Inc. All Rights Reserved.
//
// Licensed under the Apache License, Version 2.0 (the "License");
// you may not use this file except in compliance with the License.
// You may obtain a copy of the License at
//
// http://www.apache.org/licenses/LICENSE-2.0
//
// Unless required by applicable law or agreed to in writing, software
// distributed under the License is distributed on an "AS IS" BASIS,
// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
// See the License for the specific language governing permissions and
// limitations under the License.
// Wrapper around cl that adds /showIncludes to command line, and uses that to
// generate .d files that match the style from gcc -MD.
//
// /showIncludes is equivalent to -MD, not -MMD, that is, system headers are
// included.
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#include <cmSystemTools.h>
#include <cmsys/Encoding.hxx>
#include <sstream>
#include <windows.h>
// We don't want any wildcard expansion.
// See http://msdn.microsoft.com/en-us/library/zay8tzh6(v=vs.85).aspx
void _setargv()
{
}
static void Fatal(const char* msg, ...)
{
va_list ap;
fprintf(stderr, "ninja: FATAL: ");
va_start(ap, msg);
vfprintf(stderr, msg, ap);
va_end(ap);
fprintf(stderr, "\n");
// On Windows, some tools may inject extra threads.
// exit() may block on locks held by those threads, so forcibly exit.
fflush(stderr);
fflush(stdout);
ExitProcess(1);
}
static void usage(const char* msg)
{
Fatal("%s\n\nusage:\n "
"cmcldeps "
"<language C, CXX or RC> "
"<source file path> "
"<output path for *.d file> "
"<output path for *.obj file> "
"<prefix of /showIncludes> "
"<path to cl.exe> "
"<path to tool (cl or rc)> "
"<rest of command ...>\n",
msg);
}
static std::string trimLeadingSpace(const std::string& cmdline)
{
int i = 0;
for (; cmdline[i] == ' '; ++i)
;
return cmdline.substr(i);
}
static void replaceAll(std::string& str, const std::string& search,
const std::string& repl)
{
std::string::size_type pos = 0;
while ((pos = str.find(search, pos)) != std::string::npos) {
str.replace(pos, search.size(), repl);
pos += repl.size();
}
}
bool startsWith(const std::string& str, const std::string& what)
{
return str.compare(0, what.size(), what) == 0;
}
// Strips one argument from the cmdline and returns it. "surrounding quotes"
// are removed from the argument if there were any.
static std::string getArg(std::string& cmdline)
{
std::string ret;
bool in_quoted = false;
unsigned int i = 0;
cmdline = trimLeadingSpace(cmdline);
for (;; ++i) {
if (i >= cmdline.size())
usage("Couldn't parse arguments.");
if (!in_quoted && cmdline[i] == ' ')
break; // "a b" "x y"
if (cmdline[i] == '"')
in_quoted = !in_quoted;
}
ret = cmdline.substr(0, i);
if (ret[0] == '"' && ret[i - 1] == '"')
ret = ret.substr(1, ret.size() - 2);
cmdline = cmdline.substr(i);
return ret;
}
static void parseCommandLine(LPWSTR wincmdline, std::string& lang,
std::string& srcfile, std::string& dfile,
std::string& objfile, std::string& prefix,
std::string& clpath, std::string& binpath,
std::string& rest)
{
std::string cmdline = cmsys::Encoding::ToNarrow(wincmdline);
/* self */ getArg(cmdline);
lang = getArg(cmdline);
srcfile = getArg(cmdline);
dfile = getArg(cmdline);
objfile = getArg(cmdline);
prefix = getArg(cmdline);
clpath = getArg(cmdline);
binpath = getArg(cmdline);
rest = trimLeadingSpace(cmdline);
}
// Not all backslashes need to be escaped in a depfile, but it's easier that
// way. See the re2c grammar in ninja's source code for more info.
static void escapePath(std::string& path)
{
replaceAll(path, "\\", "\\\\");
replaceAll(path, " ", "\\ ");
}
static void outputDepFile(const std::string& dfile, const std::string& objfile,
std::vector<std::string>& incs)
{
if (dfile.empty())
return;
// strip duplicates
std::sort(incs.begin(), incs.end());
incs.erase(std::unique(incs.begin(), incs.end()), incs.end());
FILE* out = cmsys::SystemTools::Fopen(dfile.c_str(), "wb");
// FIXME should this be fatal or not? delete obj? delete d?
if (!out)
return;
std::string cwd = cmSystemTools::GetCurrentWorkingDirectory();
replaceAll(cwd, "/", "\\");
cwd += "\\";
std::string tmp = objfile;
escapePath(tmp);
fprintf(out, "%s: \\\n", tmp.c_str());
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std::vector<std::string>::iterator it = incs.begin();
for (; it != incs.end(); ++it) {
tmp = *it;
// The paths need to match the ones used to identify build artifacts in the
// build.ninja file. Therefore we need to canonicalize the path to use
// backward slashes and relativize the path to the build directory.
replaceAll(tmp, "/", "\\");
if (startsWith(tmp, cwd))
tmp = tmp.substr(cwd.size());
escapePath(tmp);
fprintf(out, "%s \\\n", tmp.c_str());
}
fprintf(out, "\n");
fclose(out);
}
bool contains(const std::string& str, const std::string& what)
{
return str.find(what) != std::string::npos;
}
std::string replace(const std::string& str, const std::string& what,
const std::string& replacement)
{
size_t pos = str.find(what);
if (pos == std::string::npos)
return str;
std::string replaced = str;
return replaced.replace(pos, what.size(), replacement);
}
static int process(const std::string& srcfilename, const std::string& dfile,
const std::string& objfile, const std::string& prefix,
const std::string& cmd, const std::string& dir = "",
bool quiet = false)
{
std::string output;
// break up command line into a vector
std::vector<std::string> args;
cmSystemTools::ParseWindowsCommandLine(cmd.c_str(), args);
// convert to correct vector type for RunSingleCommand
std::vector<std::string> command;
for (std::vector<std::string>::iterator i = args.begin(); i != args.end();
++i) {
command.push_back(i->c_str());
}
// run the command
int exit_code = 0;
bool run =
cmSystemTools::RunSingleCommand(command, &output, &output, &exit_code,
dir.c_str(), cmSystemTools::OUTPUT_NONE);
// process the include directives and output everything else
std::stringstream ss(output);
std::string line;
std::vector<std::string> includes;
bool isFirstLine = true; // cl prints always first the source filename
while (std::getline(ss, line)) {
if (startsWith(line, prefix)) {
std::string inc = trimLeadingSpace(line.substr(prefix.size()).c_str());
if (inc[inc.size() - 1] == '\r') // blech, stupid \r\n
inc = inc.substr(0, inc.size() - 1);
includes.push_back(inc);
} else {
if (!isFirstLine || !startsWith(line, srcfilename)) {
if (!quiet || exit_code != 0) {
fprintf(stdout, "%s\n", line.c_str());
}
} else {
isFirstLine = false;
}
}
}
// don't update .d until/unless we succeed compilation
if (run && exit_code == 0)
outputDepFile(dfile, objfile, includes);
return exit_code;
}
int main()
{
// Use the Win32 API instead of argc/argv so we can avoid interpreting the
// rest of command line after the .d and .obj. Custom parsing seemed
// preferable to the ugliness you get into in trying to re-escape quotes for
// subprocesses, so by avoiding argc/argv, the subprocess is called with
// the same command line verbatim.
std::string lang, srcfile, dfile, objfile, prefix, cl, binpath, rest;
parseCommandLine(GetCommandLineW(), lang, srcfile, dfile, objfile, prefix,
cl, binpath, rest);
// needed to suppress filename output of msvc tools
std::string srcfilename;
{
std::string::size_type pos = srcfile.rfind("\\");
if (pos == std::string::npos) {
srcfilename = srcfile;
} else {
srcfilename = srcfile.substr(pos + 1);
}
}
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std::string nol = " /nologo ";
std::string show = " /showIncludes ";
if (lang == "C" || lang == "CXX") {
return process(srcfilename, dfile, objfile, prefix,
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binpath + nol + show + rest);
} else if (lang == "RC") {
// "misuse" cl.exe to get headers from .rc files
std::string clrest = rest;
// rc: /fo x.dir\x.rc.res -> cl: /out:x.dir\x.rc.res.dep.obj
clrest = replace(clrest, "/fo", "/out:");
clrest = replace(clrest, objfile, objfile + ".dep.obj ");
// rc: src\x\x.rc -> cl: /Tc src\x\x.rc
if (srcfile.find(" ") != std::string::npos)
srcfile = "\"" + srcfile + "\"";
clrest = replace(clrest, srcfile, "/Tc " + srcfile);
cl = "\"" + cl + "\" /P /DRC_INVOKED ";
// call cl in object dir so the .i is generated there
std::string objdir;
{
std::string::size_type pos = objfile.rfind("\\");
if (pos != std::string::npos) {
objdir = objfile.substr(0, pos);
}
}
// extract dependencies with cl.exe
int exit_code = process(srcfilename, dfile, objfile, prefix,
cl + nol + show + clrest, objdir, true);
if (exit_code != 0)
return exit_code;
// compile rc file with rc.exe
return process(srcfilename, "", objfile, prefix, binpath + " " + rest);
}
usage("Invalid language specified.");
return 1;
}