CMake/Source/cmDepends.cxx

278 lines
8.9 KiB
C++

/* Distributed under the OSI-approved BSD 3-Clause License. See accompanying
file Copyright.txt or https://cmake.org/licensing for details. */
#include "cmDepends.h"
#include "cmFileTimeComparison.h"
#include "cmGeneratedFileStream.h"
#include "cmLocalGenerator.h"
#include "cmMakefile.h"
#include "cmSystemTools.h"
#include <cmsys/FStream.hxx>
#include <sstream>
#include <string.h>
#include <utility>
cmDepends::cmDepends(cmLocalGenerator* lg, const char* targetDir)
: CompileDirectory()
, LocalGenerator(lg)
, Verbose(false)
, FileComparison(CM_NULLPTR)
, TargetDirectory(targetDir)
, MaxPath(16384)
, Dependee(new char[MaxPath])
, Depender(new char[MaxPath])
{
}
cmDepends::~cmDepends()
{
delete[] this->Dependee;
delete[] this->Depender;
}
bool cmDepends::Write(std::ostream& makeDepends, std::ostream& internalDepends)
{
// Lookup the set of sources to scan.
std::string srcLang = "CMAKE_DEPENDS_CHECK_";
srcLang += this->Language;
cmMakefile* mf = this->LocalGenerator->GetMakefile();
const char* srcStr = mf->GetSafeDefinition(srcLang);
std::vector<std::string> pairs;
cmSystemTools::ExpandListArgument(srcStr, pairs);
std::map<std::string, std::set<std::string> > dependencies;
for (std::vector<std::string>::iterator si = pairs.begin();
si != pairs.end();) {
// Get the source and object file.
std::string const& src = *si++;
if (si == pairs.end()) {
break;
}
std::string const& obj = *si++;
dependencies[obj].insert(src);
}
for (std::map<std::string, std::set<std::string> >::const_iterator it =
dependencies.begin();
it != dependencies.end(); ++it) {
// Write the dependencies for this pair.
if (!this->WriteDependencies(it->second, it->first, makeDepends,
internalDepends)) {
return false;
}
}
return this->Finalize(makeDepends, internalDepends);
}
bool cmDepends::Finalize(std::ostream& /*unused*/, std::ostream& /*unused*/)
{
return true;
}
bool cmDepends::Check(const char* makeFile, const char* internalFile,
std::map<std::string, DependencyVector>& validDeps)
{
// Dependency checks must be done in proper working directory.
std::string oldcwd = ".";
if (this->CompileDirectory != ".") {
// Get the CWD but do not call CollapseFullPath because
// we only need it to cd back, and the form does not matter
oldcwd = cmSystemTools::GetCurrentWorkingDirectory(false);
cmSystemTools::ChangeDirectory(this->CompileDirectory);
}
// Check whether dependencies must be regenerated.
bool okay = true;
cmsys::ifstream fin(internalFile);
if (!(fin && this->CheckDependencies(fin, internalFile, validDeps))) {
// Clear all dependencies so they will be regenerated.
this->Clear(makeFile);
cmSystemTools::RemoveFile(internalFile);
okay = false;
}
// Restore working directory.
if (oldcwd != ".") {
cmSystemTools::ChangeDirectory(oldcwd);
}
return okay;
}
void cmDepends::Clear(const char* file)
{
// Print verbose output.
if (this->Verbose) {
std::ostringstream msg;
msg << "Clearing dependencies in \"" << file << "\"." << std::endl;
cmSystemTools::Stdout(msg.str().c_str());
}
// Write an empty dependency file.
cmGeneratedFileStream depFileStream(file);
depFileStream << "# Empty dependencies file\n"
<< "# This may be replaced when dependencies are built."
<< std::endl;
}
bool cmDepends::WriteDependencies(const std::set<std::string>& /*unused*/,
const std::string& /*unused*/,
std::ostream& /*unused*/,
std::ostream& /*unused*/)
{
// This should be implemented by the subclass.
return false;
}
bool cmDepends::CheckDependencies(
std::istream& internalDepends, const char* internalDependsFileName,
std::map<std::string, DependencyVector>& validDeps)
{
// Parse dependencies from the stream. If any dependee is missing
// or newer than the depender then dependencies should be
// regenerated.
bool okay = true;
bool dependerExists = false;
DependencyVector* currentDependencies = CM_NULLPTR;
while (internalDepends.getline(this->Dependee, this->MaxPath)) {
if (this->Dependee[0] == 0 || this->Dependee[0] == '#' ||
this->Dependee[0] == '\r') {
continue;
}
size_t len = internalDepends.gcount() - 1;
if (this->Dependee[len - 1] == '\r') {
len--;
this->Dependee[len] = 0;
}
if (this->Dependee[0] != ' ') {
memcpy(this->Depender, this->Dependee, len + 1);
// Calling FileExists() for the depender here saves in many cases 50%
// of the calls to FileExists() further down in the loop. E.g. for
// kdelibs/khtml this reduces the number of calls from 184k down to 92k,
// or the time for cmake -E cmake_depends from 0.3 s down to 0.21 s.
dependerExists = cmSystemTools::FileExists(this->Depender);
// If we erase validDeps[this->Depender] by overwriting it with an empty
// vector, we lose dependencies for dependers that have multiple
// entries. No need to initialize the entry, std::map will do so on first
// access.
currentDependencies = &validDeps[this->Depender];
continue;
}
/*
// Parse the dependency line.
if(!this->ParseDependency(line.c_str()))
{
continue;
}
*/
// Dependencies must be regenerated
// * if the dependee does not exist
// * if the depender exists and is older than the dependee.
// * if the depender does not exist, but the dependee is newer than the
// depends file
bool regenerate = false;
const char* dependee = this->Dependee + 1;
const char* depender = this->Depender;
if (currentDependencies != CM_NULLPTR) {
currentDependencies->push_back(dependee);
}
if (!cmSystemTools::FileExists(dependee)) {
// The dependee does not exist.
regenerate = true;
// Print verbose output.
if (this->Verbose) {
std::ostringstream msg;
msg << "Dependee \"" << dependee << "\" does not exist for depender \""
<< depender << "\"." << std::endl;
cmSystemTools::Stdout(msg.str().c_str());
}
} else {
if (dependerExists) {
// The dependee and depender both exist. Compare file times.
int result = 0;
if ((!this->FileComparison->FileTimeCompare(depender, dependee,
&result) ||
result < 0)) {
// The depender is older than the dependee.
regenerate = true;
// Print verbose output.
if (this->Verbose) {
std::ostringstream msg;
msg << "Dependee \"" << dependee << "\" is newer than depender \""
<< depender << "\"." << std::endl;
cmSystemTools::Stdout(msg.str().c_str());
}
}
} else {
// The dependee exists, but the depender doesn't. Regenerate if the
// internalDepends file is older than the dependee.
int result = 0;
if ((!this->FileComparison->FileTimeCompare(internalDependsFileName,
dependee, &result) ||
result < 0)) {
// The depends-file is older than the dependee.
regenerate = true;
// Print verbose output.
if (this->Verbose) {
std::ostringstream msg;
msg << "Dependee \"" << dependee
<< "\" is newer than depends file \""
<< internalDependsFileName << "\"." << std::endl;
cmSystemTools::Stdout(msg.str().c_str());
}
}
}
}
if (regenerate) {
// Dependencies must be regenerated.
okay = false;
// Remove the information of this depender from the map, it needs
// to be rescanned
if (currentDependencies != CM_NULLPTR) {
validDeps.erase(this->Depender);
currentDependencies = CM_NULLPTR;
}
// Remove the depender to be sure it is rebuilt.
if (dependerExists) {
cmSystemTools::RemoveFile(depender);
dependerExists = false;
}
}
}
return okay;
}
void cmDepends::SetIncludePathFromLanguage(const std::string& lang)
{
// Look for the new per "TARGET_" variant first:
const char* includePath = CM_NULLPTR;
std::string includePathVar = "CMAKE_";
includePathVar += lang;
includePathVar += "_TARGET_INCLUDE_PATH";
cmMakefile* mf = this->LocalGenerator->GetMakefile();
includePath = mf->GetDefinition(includePathVar);
if (includePath) {
cmSystemTools::ExpandListArgument(includePath, this->IncludePath);
} else {
// Fallback to the old directory level variable if no per-target var:
includePathVar = "CMAKE_";
includePathVar += lang;
includePathVar += "_INCLUDE_PATH";
includePath = mf->GetDefinition(includePathVar);
if (includePath) {
cmSystemTools::ExpandListArgument(includePath, this->IncludePath);
}
}
}