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cmFileTimeComparison: Use cmFileTime internally

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This replaces OS dependent code in `cmFileTimeComparison` with `cmFileTime`
instances that provide the required file time load and comparison operations.

A new public `cmFileTimeComparison::Load` method is introduced that,
for a given file name, updates the `cmFileTimeComparison` cache on demand and
returns a `cmFileTime` instance on success.
This commit is contained in:
Sebastian Holtermann
2019-03-13 18:50:06 +01:00
parent 6f24c4e93f
commit 103aa9e46a
3 changed files with 54 additions and 184 deletions
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2
Source/CMakeLists.txt
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@@ -800,8 +800,6 @@ foreach(check
endif()
set_property(SOURCE cmFileTime.cxx APPEND PROPERTY
COMPILE_DEFINITIONS CMake_${check}=${CMake_${check}})
set_property(SOURCE cmFileTimeComparison.cxx APPEND PROPERTY
COMPILE_DEFINITIONS CMake_${check}=${CMake_${check}})
endforeach()
# create a library used by the command line and the GUI

207
Source/cmFileTimeComparison.cxx
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@@ -3,74 +3,40 @@
#include "cmFileTimeComparison.h"
#include <string>
#include <time.h>
#include <unordered_map>
#include <utility>
// Use a platform-specific API to get file times efficiently.
#if !defined(_WIN32) || defined(__CYGWIN__)
# include "cm_sys_stat.h"
# define cmFileTimeComparison_Type struct stat
#else
# include "cmsys/Encoding.hxx"
# include <windows.h>
# define cmFileTimeComparison_Type FILETIME
#endif
class cmFileTimeComparisonInternal
{
public:
// Internal comparison method.
inline bool FileTimeCompare(const std::string& f1, const std::string& f2,
inline bool Load(std::string const& fname, cmFileTime& ftm);
inline bool FileTimeCompare(std::string const& f1, std::string const& f2,
int* result);
bool FileTimesDiffer(const std::string& f1, const std::string& f2);
bool FileTimesDiffer(std::string const& f1, std::string const& f2);
private:
typedef std::unordered_map<std::string, cmFileTimeComparison_Type>
FileStatsMap;
typedef std::unordered_map<std::string, cmFileTime> FileStatsMap;
FileStatsMap Files;
// Internal methods to lookup and compare modification times.
inline bool Stat(const std::string& fname, cmFileTimeComparison_Type* st);
inline int Compare(cmFileTimeComparison_Type* st1,
cmFileTimeComparison_Type* st2);
inline bool TimesDiffer(cmFileTimeComparison_Type* st1,
cmFileTimeComparison_Type* st2);
};
bool cmFileTimeComparisonInternal::Stat(const std::string& fname,
cmFileTimeComparison_Type* st)
bool cmFileTimeComparisonInternal::Load(std::string const& fname,
cmFileTime& ftm)
{
// Use the stored time if available.
cmFileTimeComparisonInternal::FileStatsMap::iterator fit =
this->Files.find(fname);
if (fit != this->Files.end()) {
*st = fit->second;
return true;
{
auto fit = this->Files.find(fname);
if (fit != this->Files.end()) {
ftm = fit->second;
return true;
}
}
#if !defined(_WIN32) || defined(__CYGWIN__)
// POSIX version. Use the stat function.
int res = ::stat(fname.c_str(), st);
if (res != 0) {
// Read file time from OS
if (!ftm.Load(fname)) {
return false;
}
#else
// Windows version. Get the modification time from extended file
// attributes.
WIN32_FILE_ATTRIBUTE_DATA fdata;
if (!GetFileAttributesExW(cmsys::Encoding::ToWide(fname).c_str(),
GetFileExInfoStandard, &fdata)) {
return false;
}
// Copy the file time to the output location.
*st = fdata.ftLastWriteTime;
#endif
// Store the time for future use.
this->Files[fname] = *st;
// Store file time in cache
this->Files[fname] = ftm;
return true;
}
@@ -84,133 +50,33 @@ cmFileTimeComparison::~cmFileTimeComparison()
delete this->Internals;
}
bool cmFileTimeComparison::FileTimeCompare(const std::string& f1,
const std::string& f2, int* result)
bool cmFileTimeComparison::Load(std::string const& fileName,
cmFileTime& fileTime)
{
return this->Internals->Load(fileName, fileTime);
}
bool cmFileTimeComparison::FileTimeCompare(std::string const& f1,
std::string const& f2, int* result)
{
return this->Internals->FileTimeCompare(f1, f2, result);
}
bool cmFileTimeComparison::FileTimesDiffer(const std::string& f1,
const std::string& f2)
bool cmFileTimeComparison::FileTimesDiffer(std::string const& f1,
std::string const& f2)
{
return this->Internals->FileTimesDiffer(f1, f2);
}
int cmFileTimeComparisonInternal::Compare(cmFileTimeComparison_Type* s1,
cmFileTimeComparison_Type* s2)
{
#if !defined(_WIN32) || defined(__CYGWIN__)
# if CMake_STAT_HAS_ST_MTIM
// Compare using nanosecond resolution.
if (s1->st_mtim.tv_sec < s2->st_mtim.tv_sec) {
return -1;
}
if (s1->st_mtim.tv_sec > s2->st_mtim.tv_sec) {
return 1;
}
if (s1->st_mtim.tv_nsec < s2->st_mtim.tv_nsec) {
return -1;
}
if (s1->st_mtim.tv_nsec > s2->st_mtim.tv_nsec) {
return 1;
}
# elif CMake_STAT_HAS_ST_MTIMESPEC
// Compare using nanosecond resolution.
if (s1->st_mtimespec.tv_sec < s2->st_mtimespec.tv_sec) {
return -1;
}
if (s1->st_mtimespec.tv_sec > s2->st_mtimespec.tv_sec) {
return 1;
}
if (s1->st_mtimespec.tv_nsec < s2->st_mtimespec.tv_nsec) {
return -1;
}
if (s1->st_mtimespec.tv_nsec > s2->st_mtimespec.tv_nsec) {
return 1;
}
# else
// Compare using 1 second resolution.
if (s1->st_mtime < s2->st_mtime) {
return -1;
}
if (s1->st_mtime > s2->st_mtime) {
return 1;
}
# endif
// Files have the same time.
return 0;
#else
// Compare using system-provided function.
return (int)CompareFileTime(s1, s2);
#endif
}
bool cmFileTimeComparisonInternal::TimesDiffer(cmFileTimeComparison_Type* s1,
cmFileTimeComparison_Type* s2)
{
#if !defined(_WIN32) || defined(__CYGWIN__)
# if CMake_STAT_HAS_ST_MTIM
// Times are integers in units of 1ns.
long long bil = 1000000000;
long long t1 = s1->st_mtim.tv_sec * bil + s1->st_mtim.tv_nsec;
long long t2 = s2->st_mtim.tv_sec * bil + s2->st_mtim.tv_nsec;
if (t1 < t2) {
return (t2 - t1) >= bil;
}
if (t2 < t1) {
return (t1 - t2) >= bil;
}
return false;
# elif CMake_STAT_HAS_ST_MTIMESPEC
// Times are integers in units of 1ns.
long long bil = 1000000000;
long long t1 = s1->st_mtimespec.tv_sec * bil + s1->st_mtimespec.tv_nsec;
long long t2 = s2->st_mtimespec.tv_sec * bil + s2->st_mtimespec.tv_nsec;
if (t1 < t2) {
return (t2 - t1) >= bil;
}
if (t2 < t1) {
return (t1 - t2) >= bil;
}
return false;
# else
// Times are integers in units of 1s.
if (s1->st_mtime < s2->st_mtime) {
return (s2->st_mtime - s1->st_mtime) >= 1;
}
if (s1->st_mtime > s2->st_mtime) {
return (s1->st_mtime - s2->st_mtime) >= 1;
}
return false;
# endif
#else
// Times are integers in units of 100ns.
LARGE_INTEGER t1;
LARGE_INTEGER t2;
t1.LowPart = s1->dwLowDateTime;
t1.HighPart = s1->dwHighDateTime;
t2.LowPart = s2->dwLowDateTime;
t2.HighPart = s2->dwHighDateTime;
if (t1.QuadPart < t2.QuadPart) {
return (t2.QuadPart - t1.QuadPart) >= static_cast<LONGLONG>(10000000);
} else if (t2.QuadPart < t1.QuadPart) {
return (t1.QuadPart - t2.QuadPart) >= static_cast<LONGLONG>(10000000);
} else {
return false;
}
#endif
}
bool cmFileTimeComparisonInternal::FileTimeCompare(const std::string& f1,
const std::string& f2,
bool cmFileTimeComparisonInternal::FileTimeCompare(std::string const& f1,
std::string const& f2,
int* result)
{
// Get the modification time for each file.
cmFileTimeComparison_Type s1;
cmFileTimeComparison_Type s2;
if (this->Stat(f1, &s1) && this->Stat(f2, &s2)) {
cmFileTime ft1, ft2;
if (this->Load(f1, ft1) && this->Load(f2, ft2)) {
// Compare the two modification times.
*result = this->Compare(&s1, &s2);
*result = ft1.Compare(ft2);
return true;
}
// No comparison available. Default to the same time.
@@ -218,15 +84,14 @@ bool cmFileTimeComparisonInternal::FileTimeCompare(const std::string& f1,
return false;
}
bool cmFileTimeComparisonInternal::FileTimesDiffer(const std::string& f1,
const std::string& f2)
bool cmFileTimeComparisonInternal::FileTimesDiffer(std::string const& f1,
std::string const& f2)
{
// Get the modification time for each file.
cmFileTimeComparison_Type s1;
cmFileTimeComparison_Type s2;
if (this->Stat(f1, &s1) && this->Stat(f2, &s2)) {
cmFileTime ft1, ft2;
if (this->Load(f1, ft1) && this->Load(f2, ft2)) {
// Compare the two modification times.
return this->TimesDiffer(&s1, &s2);
return ft1.DifferS(ft2);
}
// No comparison available. Default to different times.
return true;

29
Source/cmFileTimeComparison.h
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@@ -5,14 +5,13 @@
#include "cmConfigure.h" // IWYU pragma: keep
#include "cmFileTime.h"
#include <string>
class cmFileTimeComparisonInternal;
/** \class cmFileTimeComparison
* \brief Helper class for comparing file modification times.
*
* Compare file modification times or test if file modification times differ.
* \brief Caches file modification times in an internal map for fast lookups.
*/
class cmFileTimeComparison
{
@@ -24,19 +23,27 @@ public:
cmFileTimeComparison& operator=(const cmFileTimeComparison&) = delete;
/**
* Compare file modification times.
* Return true for successful comparison and false for error.
* When true is returned, result has -1, 0, +1 for
* f1 older, same, or newer than f2.
* @brief Loads the file time from the cache or the file system.
* @return true on success
*/
bool FileTimeCompare(const std::string& f1, const std::string& f2,
bool Load(std::string const& fileName, cmFileTime& fileTime);
/**
* @brief Compare file modification times.
* @return true for successful comparison and false for error.
*
* When true is returned, result has -1, 0, +1 for
* f1 older, same, or newer than f2.
*/
bool FileTimeCompare(std::string const& f1, std::string const& f2,
int* result);
/**
* Compare file modification times. Return true unless both files
* exist and have modification times less than 1 second apart.
* @brief Compare file modification times.
* @return true unless both files exist and have modification times less
* than 1 second apart.
*/
bool FileTimesDiffer(const std::string& f1, const std::string& f2);
bool FileTimesDiffer(std::string const& f1, std::string const& f2);
protected:
cmFileTimeComparisonInternal* Internals;