swh:1:snp:3cba5856b0ddc3feab6c3c2d096d614b02c883ec
Tip revision: e647949539f4704a00eddac2357d59ceeb8bc0ca authored by Brad King on 28 May 2020, 10:57:26 UTC
CMake 3.17.3
CMake 3.17.3
Tip revision: e647949
cmDependsC.cxx
/* Distributed under the OSI-approved BSD 3-Clause License. See accompanying
file Copyright.txt or https://cmake.org/licensing for details. */
#include "cmDependsC.h"
#include <utility>
#include "cmsys/FStream.hxx"
#include "cmFileTime.h"
#include "cmLocalGenerator.h"
#include "cmMakefile.h"
#include "cmStringAlgorithms.h"
#include "cmSystemTools.h"
#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() = default;
cmDependsC::cmDependsC(cmLocalGenerator* lg, const std::string& targetDir,
const std::string& lang, const DependencyMap* 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 = cmStrCat("CMAKE_", lang, "_INCLUDE_REGEX_SCAN");
if (const char* sr = mf->GetDefinition(scanRegexVar)) {
scanRegex = sr;
}
std::string complainRegexVar =
cmStrCat("CMAKE_", lang, "_INCLUDE_REGEX_COMPLAIN");
if (const char* cr = mf->GetDefinition(complainRegexVar)) {
complainRegex = cr;
}
}
this->IncludeRegexLine.compile(INCLUDE_REGEX_LINE);
this->IncludeRegexScan.compile(scanRegex);
this->IncludeRegexComplain.compile(complainRegex);
this->IncludeRegexLineString = INCLUDE_REGEX_LINE_MARKER INCLUDE_REGEX_LINE;
this->IncludeRegexScanString =
cmStrCat(INCLUDE_REGEX_SCAN_MARKER, scanRegex);
this->IncludeRegexComplainString =
cmStrCat(INCLUDE_REGEX_COMPLAIN_MARKER, complainRegex);
this->SetupTransforms();
this->CacheFileName =
cmStrCat(this->TargetDirectory, '/', lang, ".includecache");
this->ReadCacheFile();
}
cmDependsC::~cmDependsC()
{
this->WriteCacheFile();
}
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;
std::string binDir = this->LocalGenerator->GetBinaryDirectory();
// Compute a path to the object file to write to the internal depend file.
// Any existing content of the internal depend file has already been
// loaded in ValidDeps with this path as a key.
std::string obj_i =
this->LocalGenerator->MaybeConvertToRelativePath(binDir, obj);
if (this->ValidDeps != nullptr) {
auto const tmpIt = this->ValidDeps->find(obj_i);
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 = static_cast<int>(sources.size());
this->Encountered.clear();
for (std::string const& src : sources) {
UnscannedEntry root;
root.FileName = src;
this->Unscanned.push(root);
this->Encountered.insert(src);
}
std::set<std::string> scanned;
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)) {
if (cmSystemTools::FileExists(current.FileName, true)) {
fullName = current.FileName;
}
} else if (!current.QuotedLocation.empty() &&
cmSystemTools::FileExists(current.QuotedLocation, 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 {
auto headerLocationIt =
this->HeaderLocationCache.find(current.FileName);
if (headerLocationIt != this->HeaderLocationCache.end()) {
fullName = headerLocationIt->second;
} else {
for (std::string const& iPath : this->IncludePath) {
// Construct the name of the file as if it were in the current
// include directory. Avoid using a leading "./".
std::string tmpPath =
cmSystemTools::CollapseFullPath(current.FileName, iPath);
// Look for the file in this location.
if (cmSystemTools::FileExists(tmpPath, true)) {
fullName = tmpPath;
this->HeaderLocationCache[current.FileName] = std::move(tmpPath);
break;
}
}
}
}
// Complain if the file cannot be found and matches the complain
// regex.
if (fullName.empty() &&
this->IncludeRegexComplain.find(current.FileName)) {
cmSystemTools::Error("Cannot find file \"" + current.FileName + "\".");
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
auto fileIt = this->FileCache.find(fullName);
if (fileIt != this->FileCache.end()) {
fileIt->second.Used = true;
dependencies.insert(fullName);
for (UnscannedEntry const& inc : fileIt->second.UnscannedEntries) {
if (this->Encountered.find(inc.FileName) ==
this->Encountered.end()) {
this->Encountered.insert(inc.FileName);
this->Unscanned.push(inc);
}
}
} 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, 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_m = cmSystemTools::ConvertToOutputPath(obj_i);
internalDepends << obj_i << std::endl;
for (std::string const& dep : dependencies) {
makeDepends << obj_m << ": "
<< cmSystemTools::ConvertToOutputPath(
this->LocalGenerator->MaybeConvertToRelativePath(binDir,
dep))
<< std::endl;
internalDepends << " " << dep << 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 = nullptr;
bool haveFileName = false;
cmFileTime cacheFileTime;
bool const cacheFileTimeGood = cacheFileTime.Load(this->CacheFileName);
while (cmSystemTools::GetLineFromStream(fin, line)) {
if (line.empty()) {
cacheEntry = nullptr;
haveFileName = false;
continue;
}
// the first line after an empty line is the name of the parsed file
if (!haveFileName) {
haveFileName = true;
cmFileTime fileTime;
bool const res = cacheFileTimeGood && fileTime.Load(line);
bool const newer = res && cacheFileTime.Newer(fileTime);
if (res && newer) // cache is newer than the parsed file
{
cacheEntry = &this->FileCache[line];
}
// file doesn't exist, check that the regular expressions
// haven't changed
else if (!res) {
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 != nullptr) {
UnscannedEntry entry;
entry.FileName = line;
if (cmSystemTools::GetLineFromStream(fin, line)) {
if (line != "-") {
entry.QuotedLocation = line;
}
cacheEntry->UnscannedEntries.push_back(std::move(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 (auto const& fileIt : this->FileCache) {
if (fileIt.second.Used) {
cacheOut << fileIt.first << std::endl;
for (UnscannedEntry const& inc : fileIt.second.UnscannedEntries) {
cacheOut << inc.FileName << std::endl;
if (inc.QuotedLocation.empty()) {
cacheOut << "-" << std::endl;
} else {
cacheOut << inc.QuotedLocation << std::endl;
}
}
cacheOut << std::endl;
}
}
}
void cmDependsC::Scan(std::istream& is, const std::string& directory,
const std::string& fullName)
{
cmIncludeLines& newCacheEntry = this->FileCache[fullName];
newCacheEntry.Used = true;
// 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)) {
// 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)) {
// 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::CollapseFullPath(entry.FileName, directory);
}
// 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)) {
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")) {
cmExpandList(xform, transformRules, true);
}
for (std::string const& tr : transformRules) {
this->ParseTransform(tr);
}
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 (auto const& tr : this->TransformRules) {
xform += sep;
xform += tr.first;
sep = "|";
}
xform += ")[ \t]*\\(([^),]*)\\)";
this->IncludeRegexTransform.compile(xform);
// Build a string that encodes all transformation rules and will
// change when rules are changed.
this->IncludeRegexTransformString += xform;
for (auto const& tr : this->TransformRules) {
this->IncludeRegexTransformString += " ";
this->IncludeRegexTransformString += tr.first;
this->IncludeRegexTransformString += "(%)=";
this->IncludeRegexTransformString += tr.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 == std::string::npos || pos == 0) {
return;
}
std::string name = xform.substr(0, pos);
std::string value = xform.substr(pos + 4);
this->TransformRules[name] = value;
}
void cmDependsC::TransformLine(std::string& line)
{
// Check for a transform rule match. Return if none.
if (!this->IncludeRegexTransform.find(line)) {
return;
}
auto 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 (char c : tri->second) {
if (c == '%') {
newline += arg;
} else {
newline += c;
}
}
// Return the transformed line.
line = newline;
}