//===----------------------------------------------------------------------===//
#include "llvm/Support/FileUtilities.h"
-#include "llvm/Support/DataTypes.h"
#include "llvm/System/Path.h"
-#include "llvm/Config/unistd.h"
-#include "llvm/Config/fcntl.h"
-#include "llvm/Config/sys/types.h"
-#include "llvm/Config/sys/stat.h"
-#include "llvm/Config/sys/mman.h"
-#include "llvm/Config/alloca.h"
-#include <cerrno>
-#include <cstdio>
-#include <fstream>
-#include <iostream>
+#include "llvm/System/MappedFile.h"
+#include "llvm/ADT/StringExtras.h"
+#include <cmath>
+#include <cstring>
+#include <cctype>
using namespace llvm;
-/// DiffFiles - Compare the two files specified, returning true if they are
-/// different or if there is a file error. If you specify a string to fill in
-/// for the error option, it will set the string to an error message if an error
-/// occurs, allowing the caller to distinguish between a failed diff and a file
-/// system error.
-///
-bool llvm::DiffFiles(const std::string &FileA, const std::string &FileB,
- std::string *Error) {
- std::ifstream FileAStream(FileA.c_str());
- if (!FileAStream) {
- if (Error) *Error = "Couldn't open file '" + FileA + "'";
- return true;
- }
-
- std::ifstream FileBStream(FileB.c_str());
- if (!FileBStream) {
- if (Error) *Error = "Couldn't open file '" + FileB + "'";
- return true;
+static bool isNumberChar(char C) {
+ switch (C) {
+ case '0': case '1': case '2': case '3': case '4':
+ case '5': case '6': case '7': case '8': case '9':
+ case '.': case '+': case '-':
+ case 'e':
+ case 'E': return true;
+ default: return false;
}
+}
- // Compare the two files...
- int C1, C2;
- do {
- C1 = FileAStream.get();
- C2 = FileBStream.get();
- if (C1 != C2) return true;
- } while (C1 != EOF);
+static char *BackupNumber(char *Pos, char *FirstChar) {
+ // If we didn't stop in the middle of a number, don't backup.
+ if (!isNumberChar(*Pos)) return Pos;
- return false;
+ // Otherwise, return to the start of the number.
+ while (Pos > FirstChar && isNumberChar(Pos[-1]))
+ --Pos;
+ return Pos;
}
+/// CompareNumbers - compare two numbers, returning true if they are different.
+static bool CompareNumbers(char *&F1P, char *&F2P, char *F1End, char *F2End,
+ double AbsTolerance, double RelTolerance,
+ std::string *ErrorMsg) {
+ char *F1NumEnd, *F2NumEnd;
+ double V1 = 0.0, V2 = 0.0;
+
+ // If one of the positions is at a space and the other isn't, chomp up 'til
+ // the end of the space.
+ while (isspace(*F1P) && F1P != F1End)
+ ++F1P;
+ while (isspace(*F2P) && F2P != F2End)
+ ++F2P;
+
+ // If we stop on numbers, compare their difference.
+ if (isNumberChar(*F1P) && isNumberChar(*F2P)) {
+ V1 = strtod(F1P, &F1NumEnd);
+ V2 = strtod(F2P, &F2NumEnd);
+ } else {
+ // Otherwise, the diff failed.
+ F1NumEnd = F1P;
+ F2NumEnd = F2P;
+ }
-/// CopyFile - Copy the specified source file to the specified destination,
-/// overwriting destination if it exists. This returns true on failure.
-///
-bool llvm::CopyFile(const std::string &Dest, const std::string &Src) {
- FDHandle InFD(open(Src.c_str(), O_RDONLY));
- if (InFD == -1) return true;
-
- FileRemover FR(Dest);
-
- FDHandle OutFD(open(Dest.c_str(), O_WRONLY|O_CREAT, 0666));
- if (OutFD == -1) return true;
-
- char Buffer[16*1024];
- while (ssize_t Amt = read(InFD, Buffer, 16*1024)) {
- if (Amt == -1) {
- if (errno != EINTR) return true; // Error reading the file.
- } else {
- char *BufPtr = Buffer;
- while (Amt) {
- ssize_t AmtWritten = write(OutFD, BufPtr, Amt);
- if (AmtWritten == -1) {
- if (errno != EINTR) return true; // Error writing the file.
- } else {
- Amt -= AmtWritten;
- BufPtr += AmtWritten;
- }
+ if (F1NumEnd == F1P || F2NumEnd == F2P) {
+ if (ErrorMsg) *ErrorMsg = "Comparison failed, not a numeric difference.";
+ return true;
+ }
+
+ // Check to see if these are inside the absolute tolerance
+ if (AbsTolerance < std::abs(V1-V2)) {
+ // Nope, check the relative tolerance...
+ double Diff;
+ if (V2)
+ Diff = std::abs(V1/V2 - 1.0);
+ else if (V1)
+ Diff = std::abs(V2/V1 - 1.0);
+ else
+ Diff = 0; // Both zero.
+ if (Diff > RelTolerance) {
+ if (ErrorMsg) {
+ *ErrorMsg = "Compared: " + ftostr(V1) + " and " + ftostr(V2) +
+ ": diff = " + ftostr(Diff) + "\n";
+ *ErrorMsg += "Out of tolerance: rel/abs: " + ftostr(RelTolerance) +
+ "/" + ftostr(AbsTolerance);
}
+ return true;
}
}
- FR.releaseFile(); // Success!
+ // Otherwise, advance our read pointers to the end of the numbers.
+ F1P = F1NumEnd; F2P = F2NumEnd;
return false;
}
-
-/// MoveFileOverIfUpdated - If the file specified by New is different than Old,
-/// or if Old does not exist, move the New file over the Old file. Otherwise,
-/// remove the New file.
-///
-void llvm::MoveFileOverIfUpdated(const std::string &New,
- const std::string &Old) {
- if (DiffFiles(New, Old)) {
- if (std::rename(New.c_str(), Old.c_str()))
- std::cerr << "Error renaming '" << New << "' to '" << Old << "'!\n";
- } else {
- std::remove(New.c_str());
- }
-}
-
-/// removeFile - Delete the specified file
-///
-void llvm::removeFile(const std::string &Filename) {
- std::remove(Filename.c_str());
+// PadFileIfNeeded - If the files are not identical, we will have to be doing
+// numeric comparisons in here. There are bad cases involved where we (i.e.,
+// strtod) might run off the beginning or end of the file if it starts or ends
+// with a number. Because of this, if needed, we pad the file so that it starts
+// and ends with a null character.
+static void PadFileIfNeeded(char *&FileStart, char *&FileEnd, char *&FP) {
+ if (FileStart-FileEnd < 2 ||
+ isNumberChar(FileStart[0]) || isNumberChar(FileEnd[-1])) {
+ unsigned FileLen = FileEnd-FileStart;
+ char *NewFile = new char[FileLen+2];
+ NewFile[0] = 0; // Add null padding
+ NewFile[FileLen+1] = 0; // Add null padding
+ memcpy(NewFile+1, FileStart, FileLen);
+ FP = NewFile+(FP-FileStart)+1;
+ FileStart = NewFile+1;
+ FileEnd = FileStart+FileLen;
+ }
}
-/// getUniqueFilename - Return a filename with the specified prefix. If the
-/// file does not exist yet, return it, otherwise add a suffix to make it
-/// unique.
+/// DiffFilesWithTolerance - Compare the two files specified, returning 0 if the
+/// files match, 1 if they are different, and 2 if there is a file error. This
+/// function differs from DiffFiles in that you can specify an absolete and
+/// relative FP error that is allowed to exist. If you specify a string to fill
+/// in for the error option, it will set the string to an error message if an
+/// error occurs, allowing the caller to distinguish between a failed diff and a
+/// file system error.
///
-std::string llvm::getUniqueFilename(const std::string &FilenameBase) {
- if (!std::ifstream(FilenameBase.c_str()))
- return FilenameBase; // Couldn't open the file? Use it!
-
- // Create a pattern for mkstemp...
- char *FNBuffer = new char[FilenameBase.size()+8];
- strcpy(FNBuffer, FilenameBase.c_str());
- strcpy(FNBuffer+FilenameBase.size(), "-XXXXXX");
-
- // Agree on a temporary file name to use....
-#if defined(HAVE_MKSTEMP) && !defined(_MSC_VER)
- int TempFD;
- if ((TempFD = mkstemp(FNBuffer)) == -1) {
- // FIXME: this should return an emtpy string or something and allow the
- // caller to deal with the error!
- std::cerr << "bugpoint: ERROR: Cannot create temporary file in the current "
- << " directory!\n";
- exit(1);
- }
-
- // We don't need to hold the temp file descriptor... we will trust that no one
- // will overwrite/delete the file while we are working on it...
- close(TempFD);
-#else
- // If we don't have mkstemp, use the old and obsolete mktemp function.
- if (mktemp(FNBuffer) == 0) {
- // FIXME: this should return an emtpy string or something and allow the
- // caller to deal with the error!
- std::cerr << "bugpoint: ERROR: Cannot create temporary file in the current "
- << " directory!\n";
- exit(1);
- }
-#endif
-
- std::string Result(FNBuffer);
- delete[] FNBuffer;
- return Result;
-}
+int llvm::DiffFilesWithTolerance(const sys::Path &FileA,
+ const sys::Path &FileB,
+ double AbsTol, double RelTol,
+ std::string *Error) {
+ try {
+ // Check for zero length files because some systems croak when you try to
+ // mmap an empty file.
+ size_t A_size = FileA.getSize();
+ size_t B_size = FileB.getSize();
+
+ // If they are both zero sized then they're the same
+ if (A_size == 0 && B_size == 0)
+ return 0;
+ // If only one of them is zero sized then they can't be the same
+ if ((A_size == 0 || B_size == 0))
+ return 1;
+
+ // Now its safe to mmap the files into memory becasue both files
+ // have a non-zero size.
+ sys::MappedFile F1(FileA);
+ sys::MappedFile F2(FileB);
+ F1.map();
+ F2.map();
+
+ // Okay, now that we opened the files, scan them for the first difference.
+ char *File1Start = F1.charBase();
+ char *File2Start = F2.charBase();
+ char *File1End = File1Start+A_size;
+ char *File2End = File2Start+B_size;
+ char *F1P = File1Start;
+ char *F2P = File2Start;
+
+ if (A_size == B_size) {
+ // Are the buffers identical?
+ if (std::memcmp(File1Start, File2Start, A_size) == 0)
+ return 0;
+
+ if (AbsTol == 0 && RelTol == 0)
+ return 1; // Files different!
+ }
-//===----------------------------------------------------------------------===//
-// FDHandle class implementation
-//
+ char *OrigFile1Start = File1Start;
+ char *OrigFile2Start = File2Start;
+
+ // If the files need padding, do so now.
+ PadFileIfNeeded(File1Start, File1End, F1P);
+ PadFileIfNeeded(File2Start, File2End, F2P);
+
+ bool CompareFailed = false;
+ while (1) {
+ // Scan for the end of file or next difference.
+ while (F1P < File1End && F2P < File2End && *F1P == *F2P)
+ ++F1P, ++F2P;
+
+ if (F1P >= File1End || F2P >= File2End) break;
+
+ // Okay, we must have found a difference. Backup to the start of the
+ // current number each stream is at so that we can compare from the
+ // beginning.
+ F1P = BackupNumber(F1P, File1Start);
+ F2P = BackupNumber(F2P, File2Start);
+
+ // Now that we are at the start of the numbers, compare them, exiting if
+ // they don't match.
+ if (CompareNumbers(F1P, F2P, File1End, File2End, AbsTol, RelTol, Error)) {
+ CompareFailed = true;
+ break;
+ }
+ }
-FDHandle::~FDHandle() throw() {
- if (FD != -1) close(FD);
-}
+ // Okay, we reached the end of file. If both files are at the end, we
+ // succeeded.
+ bool F1AtEnd = F1P >= File1End;
+ bool F2AtEnd = F2P >= File2End;
+ if (!CompareFailed && (!F1AtEnd || !F2AtEnd)) {
+ // Else, we might have run off the end due to a number: backup and retry.
+ if (F1AtEnd && isNumberChar(F1P[-1])) --F1P;
+ if (F2AtEnd && isNumberChar(F2P[-1])) --F2P;
+ F1P = BackupNumber(F1P, File1Start);
+ F2P = BackupNumber(F2P, File2Start);
+
+ // Now that we are at the start of the numbers, compare them, exiting if
+ // they don't match.
+ if (CompareNumbers(F1P, F2P, File1End, File2End, AbsTol, RelTol, Error))
+ CompareFailed = true;
+
+ // If we found the end, we succeeded.
+ if (F1P < File1End || F2P < File2End)
+ CompareFailed = true;
+ }
-FDHandle &FDHandle::operator=(int fd) throw() {
- if (FD != -1) close(FD);
- FD = fd;
- return *this;
+ if (OrigFile1Start != File1Start)
+ delete[] (File1Start-1); // Back up past null byte
+ if (OrigFile2Start != File2Start)
+ delete[] (File2Start-1); // Back up past null byte
+ return CompareFailed;
+ } catch (const std::string &Msg) {
+ if (Error) *Error = Msg;
+ return 2;
+ }
}
-