https://github.com/Kitware/CMake
Tip revision: 9c507c13a0cffb163a1d56f34c020b5474a3e100 authored by Brad King on 02 November 2016, 15:46:41 UTC
CMake 3.6.3
CMake 3.6.3
Tip revision: 9c507c1
cmDependsC.cxx
/*============================================================================
CMake - Cross Platform Makefile Generator
Copyright 2000-2009 Kitware, Inc., Insight Software Consortium
Distributed under the OSI-approved BSD License (the "License");
see accompanying file Copyright.txt for details.
This software is distributed WITHOUT ANY WARRANTY; without even the
implied warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.
See the License for more information.
============================================================================*/
#include "cmDependsC.h"
#include "cmAlgorithms.h"
#include "cmFileTimeComparison.h"
#include "cmLocalGenerator.h"
#include "cmMakefile.h"
#include "cmSystemTools.h"
#include <cmsys/FStream.hxx>
#include <ctype.h> // isspace
#define INCLUDE_REGEX_LINE \
"^[ \t]*#[ \t]*(include|import)[ \t]*[<\"]([^\">]+)([\">])"
#define INCLUDE_REGEX_LINE_MARKER "#IncludeRegexLine: "
#define INCLUDE_REGEX_SCAN_MARKER "#IncludeRegexScan: "
#define INCLUDE_REGEX_COMPLAIN_MARKER "#IncludeRegexComplain: "
#define INCLUDE_REGEX_TRANSFORM_MARKER "#IncludeRegexTransform: "
cmDependsC::cmDependsC()
: ValidDeps(0)
{
}
cmDependsC::cmDependsC(
cmLocalGenerator* lg, const char* targetDir, const std::string& lang,
const std::map<std::string, DependencyVector>* validDeps)
: cmDepends(lg, targetDir)
, ValidDeps(validDeps)
{
cmMakefile* mf = lg->GetMakefile();
// Configure the include file search path.
this->SetIncludePathFromLanguage(lang);
// Configure regular expressions.
std::string scanRegex = "^.*$";
std::string complainRegex = "^$";
{
std::string scanRegexVar = "CMAKE_";
scanRegexVar += lang;
scanRegexVar += "_INCLUDE_REGEX_SCAN";
if (const char* sr = mf->GetDefinition(scanRegexVar)) {
scanRegex = sr;
}
std::string complainRegexVar = "CMAKE_";
complainRegexVar += lang;
complainRegexVar += "_INCLUDE_REGEX_COMPLAIN";
if (const char* cr = mf->GetDefinition(complainRegexVar)) {
complainRegex = cr;
}
}
this->IncludeRegexLine.compile(INCLUDE_REGEX_LINE);
this->IncludeRegexScan.compile(scanRegex.c_str());
this->IncludeRegexComplain.compile(complainRegex.c_str());
this->IncludeRegexLineString = INCLUDE_REGEX_LINE_MARKER INCLUDE_REGEX_LINE;
this->IncludeRegexScanString = INCLUDE_REGEX_SCAN_MARKER;
this->IncludeRegexScanString += scanRegex;
this->IncludeRegexComplainString = INCLUDE_REGEX_COMPLAIN_MARKER;
this->IncludeRegexComplainString += complainRegex;
this->SetupTransforms();
this->CacheFileName = this->TargetDirectory;
this->CacheFileName += "/";
this->CacheFileName += lang;
this->CacheFileName += ".includecache";
this->ReadCacheFile();
}
cmDependsC::~cmDependsC()
{
this->WriteCacheFile();
cmDeleteAll(this->FileCache);
}
bool cmDependsC::WriteDependencies(const std::set<std::string>& sources,
const std::string& obj,
std::ostream& makeDepends,
std::ostream& internalDepends)
{
// Make sure this is a scanning instance.
if (sources.empty() || sources.begin()->empty()) {
cmSystemTools::Error("Cannot scan dependencies without a source file.");
return false;
}
if (obj.empty()) {
cmSystemTools::Error("Cannot scan dependencies without an object file.");
return false;
}
std::set<std::string> dependencies;
bool haveDeps = false;
if (this->ValidDeps != 0) {
std::map<std::string, DependencyVector>::const_iterator tmpIt =
this->ValidDeps->find(obj);
if (tmpIt != this->ValidDeps->end()) {
dependencies.insert(tmpIt->second.begin(), tmpIt->second.end());
haveDeps = true;
}
}
if (!haveDeps) {
// Walk the dependency graph starting with the source file.
int srcFiles = (int)sources.size();
this->Encountered.clear();
for (std::set<std::string>::const_iterator srcIt = sources.begin();
srcIt != sources.end(); ++srcIt) {
UnscannedEntry root;
root.FileName = *srcIt;
this->Unscanned.push(root);
this->Encountered.insert(*srcIt);
}
std::set<std::string> scanned;
// Use reserve to allocate enough memory for tempPathStr
// so that during the loops no memory is allocated or freed
std::string tempPathStr;
tempPathStr.reserve(4 * 1024);
while (!this->Unscanned.empty()) {
// Get the next file to scan.
UnscannedEntry current = this->Unscanned.front();
this->Unscanned.pop();
// If not a full path, find the file in the include path.
std::string fullName;
if ((srcFiles > 0) ||
cmSystemTools::FileIsFullPath(current.FileName.c_str())) {
if (cmSystemTools::FileExists(current.FileName.c_str(), true)) {
fullName = current.FileName;
}
} else if (!current.QuotedLocation.empty() &&
cmSystemTools::FileExists(current.QuotedLocation.c_str(),
true)) {
// The include statement producing this entry was a double-quote
// include and the included file is present in the directory of
// the source containing the include statement.
fullName = current.QuotedLocation;
} else {
std::map<std::string, std::string>::iterator headerLocationIt =
this->HeaderLocationCache.find(current.FileName);
if (headerLocationIt != this->HeaderLocationCache.end()) {
fullName = headerLocationIt->second;
} else
for (std::vector<std::string>::const_iterator i =
this->IncludePath.begin();
i != this->IncludePath.end(); ++i) {
// Construct the name of the file as if it were in the current
// include directory. Avoid using a leading "./".
tempPathStr =
cmSystemTools::CollapseCombinedPath(*i, current.FileName);
// Look for the file in this location.
if (cmSystemTools::FileExists(tempPathStr.c_str(), true)) {
fullName = tempPathStr;
HeaderLocationCache[current.FileName] = fullName;
break;
}
}
}
// Complain if the file cannot be found and matches the complain
// regex.
if (fullName.empty() &&
this->IncludeRegexComplain.find(current.FileName.c_str())) {
cmSystemTools::Error("Cannot find file \"", current.FileName.c_str(),
"\".");
return false;
}
// Scan the file if it was found and has not been scanned already.
if (!fullName.empty() && (scanned.find(fullName) == scanned.end())) {
// Record scanned files.
scanned.insert(fullName);
// Check whether this file is already in the cache
std::map<std::string, cmIncludeLines*>::iterator fileIt =
this->FileCache.find(fullName);
if (fileIt != this->FileCache.end()) {
fileIt->second->Used = true;
dependencies.insert(fullName);
for (std::vector<UnscannedEntry>::const_iterator incIt =
fileIt->second->UnscannedEntries.begin();
incIt != fileIt->second->UnscannedEntries.end(); ++incIt) {
if (this->Encountered.find(incIt->FileName) ==
this->Encountered.end()) {
this->Encountered.insert(incIt->FileName);
this->Unscanned.push(*incIt);
}
}
} else {
// Try to scan the file. Just leave it out if we cannot find
// it.
cmsys::ifstream fin(fullName.c_str());
if (fin) {
cmsys::FStream::BOM bom = cmsys::FStream::ReadBOM(fin);
if (bom == cmsys::FStream::BOM_None ||
bom == cmsys::FStream::BOM_UTF8) {
// Add this file as a dependency.
dependencies.insert(fullName);
// Scan this file for new dependencies. Pass the directory
// containing the file to handle double-quote includes.
std::string dir = cmSystemTools::GetFilenamePath(fullName);
this->Scan(fin, dir.c_str(), fullName);
} else {
// Skip file with encoding we do not implement.
}
}
}
}
srcFiles--;
}
}
// Write the dependencies to the output stream. Makefile rules
// written by the original local generator for this directory
// convert the dependencies to paths relative to the home output
// directory. We must do the same here.
std::string obj_i =
this->LocalGenerator->Convert(obj, cmOutputConverter::HOME_OUTPUT);
std::string obj_m = this->LocalGenerator->ConvertToOutputFormat(
obj_i, cmOutputConverter::MAKERULE);
internalDepends << obj_i << std::endl;
for (std::set<std::string>::const_iterator i = dependencies.begin();
i != dependencies.end(); ++i) {
makeDepends << obj_m << ": "
<< this->LocalGenerator->Convert(
*i, cmOutputConverter::HOME_OUTPUT,
cmOutputConverter::MAKERULE)
<< std::endl;
internalDepends << " " << *i << std::endl;
}
makeDepends << std::endl;
return true;
}
void cmDependsC::ReadCacheFile()
{
if (this->CacheFileName.empty()) {
return;
}
cmsys::ifstream fin(this->CacheFileName.c_str());
if (!fin) {
return;
}
std::string line;
cmIncludeLines* cacheEntry = 0;
bool haveFileName = false;
while (cmSystemTools::GetLineFromStream(fin, line)) {
if (line.empty()) {
cacheEntry = 0;
haveFileName = false;
continue;
}
// the first line after an empty line is the name of the parsed file
if (haveFileName == false) {
haveFileName = true;
int newer = 0;
cmFileTimeComparison comp;
bool res = comp.FileTimeCompare(this->CacheFileName.c_str(),
line.c_str(), &newer);
if ((res == true) && (newer == 1)) // cache is newer than the parsed file
{
cacheEntry = new cmIncludeLines;
this->FileCache[line] = cacheEntry;
}
// file doesn't exist, check that the regular expressions
// haven't changed
else if (res == false) {
if (line.find(INCLUDE_REGEX_LINE_MARKER) == 0) {
if (line != this->IncludeRegexLineString) {
return;
}
} else if (line.find(INCLUDE_REGEX_SCAN_MARKER) == 0) {
if (line != this->IncludeRegexScanString) {
return;
}
} else if (line.find(INCLUDE_REGEX_COMPLAIN_MARKER) == 0) {
if (line != this->IncludeRegexComplainString) {
return;
}
} else if (line.find(INCLUDE_REGEX_TRANSFORM_MARKER) == 0) {
if (line != this->IncludeRegexTransformString) {
return;
}
}
}
} else if (cacheEntry != 0) {
UnscannedEntry entry;
entry.FileName = line;
if (cmSystemTools::GetLineFromStream(fin, line)) {
if (line != "-") {
entry.QuotedLocation = line;
}
cacheEntry->UnscannedEntries.push_back(entry);
}
}
}
}
void cmDependsC::WriteCacheFile() const
{
if (this->CacheFileName.empty()) {
return;
}
cmsys::ofstream cacheOut(this->CacheFileName.c_str());
if (!cacheOut) {
return;
}
cacheOut << this->IncludeRegexLineString << "\n\n";
cacheOut << this->IncludeRegexScanString << "\n\n";
cacheOut << this->IncludeRegexComplainString << "\n\n";
cacheOut << this->IncludeRegexTransformString << "\n\n";
for (std::map<std::string, cmIncludeLines*>::const_iterator fileIt =
this->FileCache.begin();
fileIt != this->FileCache.end(); ++fileIt) {
if (fileIt->second->Used) {
cacheOut << fileIt->first.c_str() << std::endl;
for (std::vector<UnscannedEntry>::const_iterator incIt =
fileIt->second->UnscannedEntries.begin();
incIt != fileIt->second->UnscannedEntries.end(); ++incIt) {
cacheOut << incIt->FileName.c_str() << std::endl;
if (incIt->QuotedLocation.empty()) {
cacheOut << "-" << std::endl;
} else {
cacheOut << incIt->QuotedLocation.c_str() << std::endl;
}
}
cacheOut << std::endl;
}
}
}
void cmDependsC::Scan(std::istream& is, const char* directory,
const std::string& fullName)
{
cmIncludeLines* newCacheEntry = new cmIncludeLines;
newCacheEntry->Used = true;
this->FileCache[fullName] = newCacheEntry;
// Read one line at a time.
std::string line;
while (cmSystemTools::GetLineFromStream(is, line)) {
// Transform the line content first.
if (!this->TransformRules.empty()) {
this->TransformLine(line);
}
// Match include directives.
if (this->IncludeRegexLine.find(line.c_str())) {
// Get the file being included.
UnscannedEntry entry;
entry.FileName = this->IncludeRegexLine.match(2);
cmSystemTools::ConvertToUnixSlashes(entry.FileName);
if (this->IncludeRegexLine.match(3) == "\"" &&
!cmSystemTools::FileIsFullPath(entry.FileName.c_str())) {
// This was a double-quoted include with a relative path. We
// must check for the file in the directory containing the
// file we are scanning.
entry.QuotedLocation =
cmSystemTools::CollapseCombinedPath(directory, entry.FileName);
}
// Queue the file if it has not yet been encountered and it
// matches the regular expression for recursive scanning. Note
// that this check does not account for the possibility of two
// headers with the same name in different directories when one
// is included by double-quotes and the other by angle brackets.
// It also does not work properly if two header files with the same
// name exist in different directories, and both are included from a
// file their own directory by simply using "filename.h" (#12619)
// This kind of problem will be fixed when a more
// preprocessor-like implementation of this scanner is created.
if (this->IncludeRegexScan.find(entry.FileName.c_str())) {
newCacheEntry->UnscannedEntries.push_back(entry);
if (this->Encountered.find(entry.FileName) ==
this->Encountered.end()) {
this->Encountered.insert(entry.FileName);
this->Unscanned.push(entry);
}
}
}
}
}
void cmDependsC::SetupTransforms()
{
// Get the transformation rules.
std::vector<std::string> transformRules;
cmMakefile* mf = this->LocalGenerator->GetMakefile();
if (const char* xform = mf->GetDefinition("CMAKE_INCLUDE_TRANSFORMS")) {
cmSystemTools::ExpandListArgument(xform, transformRules, true);
}
for (std::vector<std::string>::const_iterator tri = transformRules.begin();
tri != transformRules.end(); ++tri) {
this->ParseTransform(*tri);
}
this->IncludeRegexTransformString = INCLUDE_REGEX_TRANSFORM_MARKER;
if (!this->TransformRules.empty()) {
// Construct the regular expression to match lines to be
// transformed.
std::string xform = "^([ \t]*#[ \t]*(include|import)[ \t]*)(";
const char* sep = "";
for (TransformRulesType::const_iterator tri = this->TransformRules.begin();
tri != this->TransformRules.end(); ++tri) {
xform += sep;
xform += tri->first;
sep = "|";
}
xform += ")[ \t]*\\(([^),]*)\\)";
this->IncludeRegexTransform.compile(xform.c_str());
// Build a string that encodes all transformation rules and will
// change when rules are changed.
this->IncludeRegexTransformString += xform;
for (TransformRulesType::const_iterator tri = this->TransformRules.begin();
tri != this->TransformRules.end(); ++tri) {
this->IncludeRegexTransformString += " ";
this->IncludeRegexTransformString += tri->first;
this->IncludeRegexTransformString += "(%)=";
this->IncludeRegexTransformString += tri->second;
}
}
}
void cmDependsC::ParseTransform(std::string const& xform)
{
// A transform rule is of the form SOME_MACRO(%)=value-with-%
// We can simply separate with "(%)=".
std::string::size_type pos = xform.find("(%)=");
if (pos == xform.npos || pos == 0) {
return;
}
std::string name = xform.substr(0, pos);
std::string value = xform.substr(pos + 4, xform.npos);
this->TransformRules[name] = value;
}
void cmDependsC::TransformLine(std::string& line)
{
// Check for a transform rule match. Return if none.
if (!this->IncludeRegexTransform.find(line.c_str())) {
return;
}
TransformRulesType::const_iterator tri =
this->TransformRules.find(this->IncludeRegexTransform.match(3));
if (tri == this->TransformRules.end()) {
return;
}
// Construct the transformed line.
std::string newline = this->IncludeRegexTransform.match(1);
std::string arg = this->IncludeRegexTransform.match(4);
for (const char* c = tri->second.c_str(); *c; ++c) {
if (*c == '%') {
newline += arg;
} else {
newline += *c;
}
}
// Return the transformed line.
line = newline;
}