281 lines
9.1 KiB
C++
281 lines
9.1 KiB
C++
//===- Support/FileUtilities.cpp - File System Utilities ------------------===//
|
|
//
|
|
// The LLVM Compiler Infrastructure
|
|
//
|
|
// This file is distributed under the University of Illinois Open Source
|
|
// License. See LICENSE.TXT for details.
|
|
//
|
|
//===----------------------------------------------------------------------===//
|
|
//
|
|
// This file implements a family of utility functions which are useful for doing
|
|
// various things with files.
|
|
//
|
|
//===----------------------------------------------------------------------===//
|
|
|
|
#include "llvm/Support/FileUtilities.h"
|
|
#include "llvm/System/Path.h"
|
|
#include "llvm/System/MappedFile.h"
|
|
#include "llvm/ADT/StringExtras.h"
|
|
#include <cstdlib>
|
|
#include <cstring>
|
|
#include <cctype>
|
|
using namespace llvm;
|
|
|
|
static bool isSignedChar(char C) {
|
|
return (C == '+' || C == '-');
|
|
}
|
|
|
|
static bool isExponentChar(char C) {
|
|
switch (C) {
|
|
case 'D': // Strange exponential notation.
|
|
case 'd': // Strange exponential notation.
|
|
case 'e':
|
|
case 'E': return true;
|
|
default: return false;
|
|
}
|
|
}
|
|
|
|
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 '.': return true;
|
|
default: return isSignedChar(C) || isExponentChar(C);
|
|
}
|
|
}
|
|
|
|
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;
|
|
|
|
// Otherwise, return to the start of the number.
|
|
while (Pos > FirstChar && isNumberChar(Pos[-1])) {
|
|
--Pos;
|
|
if (Pos > FirstChar && isSignedChar(Pos[0]) && !isExponentChar(Pos[-1]))
|
|
break;
|
|
}
|
|
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. Note that some ugliness
|
|
// is built into this to permit support for numbers that use "D" or "d" as
|
|
// their exponential marker, e.g. "1.234D45". This occurs in 200.sixtrack in
|
|
// spec2k.
|
|
if (isNumberChar(*F1P) && isNumberChar(*F2P)) {
|
|
bool isDNotation;
|
|
do {
|
|
isDNotation = false;
|
|
V1 = strtod(F1P, &F1NumEnd);
|
|
V2 = strtod(F2P, &F2NumEnd);
|
|
|
|
if (*F1NumEnd == 'D' || *F1NumEnd == 'd') {
|
|
*F1NumEnd = 'e'; // Strange exponential notation!
|
|
isDNotation = true;
|
|
}
|
|
if (*F2NumEnd == 'D' || *F2NumEnd == 'd') {
|
|
*F2NumEnd = 'e'; // Strange exponential notation!
|
|
isDNotation = true;
|
|
}
|
|
} while (isDNotation);
|
|
} else {
|
|
// Otherwise, the diff failed.
|
|
F1NumEnd = F1P;
|
|
F2NumEnd = F2P;
|
|
}
|
|
|
|
if (F1NumEnd == F1P || F2NumEnd == F2P) {
|
|
if (ErrorMsg) {
|
|
*ErrorMsg = "FP Comparison failed, not a numeric difference between '";
|
|
*ErrorMsg += F1P[0];
|
|
*ErrorMsg += "' and '";
|
|
*ErrorMsg += F2P[0];
|
|
*ErrorMsg += "'";
|
|
}
|
|
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) + "\n";
|
|
*ErrorMsg += "abs. diff = " + ftostr(std::abs(V1-V2)) +
|
|
" rel.diff = " + ftostr(Diff) + "\n";
|
|
*ErrorMsg += "Out of tolerance: rel/abs: " + ftostr(RelTolerance) +
|
|
"/" + ftostr(AbsTolerance);
|
|
}
|
|
return true;
|
|
}
|
|
}
|
|
|
|
// Otherwise, advance our read pointers to the end of the numbers.
|
|
F1P = F1NumEnd; F2P = F2NumEnd;
|
|
return false;
|
|
}
|
|
|
|
// 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;
|
|
}
|
|
}
|
|
|
|
/// 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.
|
|
///
|
|
int llvm::DiffFilesWithTolerance(const sys::PathWithStatus &FileA,
|
|
const sys::PathWithStatus &FileB,
|
|
double AbsTol, double RelTol,
|
|
std::string *Error) {
|
|
const sys::FileStatus *FileAStat = FileA.getFileStatus(false, Error);
|
|
if (!FileAStat)
|
|
return 2;
|
|
const sys::FileStatus *FileBStat = FileB.getFileStatus(false, Error);
|
|
if (!FileBStat)
|
|
return 2;
|
|
|
|
// Check for zero length files because some systems croak when you try to
|
|
// mmap an empty file.
|
|
size_t A_size = FileAStat->getSize();
|
|
size_t B_size = FileBStat->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)) {
|
|
if (Error)
|
|
*Error = "Files differ: one is zero-sized, the other isn't";
|
|
return 1;
|
|
}
|
|
|
|
// Now its safe to mmap the files into memory becasue both files
|
|
// have a non-zero size.
|
|
sys::MappedFile F1;
|
|
if (F1.open(FileA, sys::MappedFile::READ_ACCESS, Error))
|
|
return 2;
|
|
sys::MappedFile F2;
|
|
if (F2.open(FileB, sys::MappedFile::READ_ACCESS, Error))
|
|
return 2;
|
|
if (!F1.map(Error))
|
|
return 2;
|
|
if (!F2.map(Error))
|
|
return 2;
|
|
|
|
// 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) {
|
|
if (Error)
|
|
*Error = "Files differ without tolerance allowance";
|
|
return 1; // Files different!
|
|
}
|
|
}
|
|
|
|
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;
|
|
}
|
|
}
|
|
|
|
// 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;
|
|
}
|
|
|
|
if (OrigFile1Start != File1Start)
|
|
delete[] (File1Start-1); // Back up past null byte
|
|
if (OrigFile2Start != File2Start)
|
|
delete[] (File2Start-1); // Back up past null byte
|
|
return CompareFailed;
|
|
}
|