//===- fpcmp.cpp - A fuzzy "cmp" that permits floating point noise --------===//
-//
+//
// The LLVM Compiler Infrastructure
//
-// This file was developed by the LLVM research group and is distributed under
-// the University of Illinois Open Source License. See LICENSE.TXT for details.
-//
+// This file is distributed under the University of Illinois Open Source
+// License. See LICENSE.TXT for details.
+//
//===----------------------------------------------------------------------===//
//
// fpcmp is a tool that basically works like the 'cmp' tool, except that it can
-// tolerate errors due to floating point noise, with the -r option.
+// tolerate errors due to floating point noise, with the -r and -a options.
//
//===----------------------------------------------------------------------===//
-#include "Support/CommandLine.h"
-#include "Support/FileUtilities.h"
-#include <iostream>
-#include <cmath>
-
+#include "llvm/Support/CommandLine.h"
+#include "llvm/Support/FileUtilities.h"
+#include "llvm/Support/raw_ostream.h"
using namespace llvm;
namespace {
AbsTolerance("a", cl::desc("Absolute error tolerated"), cl::init(0));
}
-
-/// OpenFile - mmap the specified file into the address space for reading, and
-/// return the length and address of the buffer.
-static void OpenFile(const std::string &Filename, unsigned &Len, char* &BufPtr){
- BufPtr = (char*)ReadFileIntoAddressSpace(Filename, Len);
- if (BufPtr == 0) {
- std::cerr << "Error: cannot open file '" << Filename << "'\n";
- exit(2);
- }
-}
-
-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;
- }
-}
-
-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;
- return Pos;
-}
-
-static void CompareNumbers(char *&F1P, char *&F2P, char *F1End, char *F2End) {
- char *F1NumEnd, *F2NumEnd;
- double V1 = 0.0, V2 = 0.0;
- // 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;
- }
-
- if (F1NumEnd == F1P || F2NumEnd == F2P) {
- std::cerr << "Comparison failed, not a numeric difference.\n";
- exit(1);
- }
-
- // 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) {
- std::cerr << "Compared: " << V1 << " and " << V2 << ": diff = "
- << Diff << "\n";
- std::cerr << "Out of tolerance: rel/abs: " << RelTolerance
- << "/" << AbsTolerance << "\n";
- exit(1);
- }
- }
-
- // Otherwise, advance our read pointers to the end of the numbers.
- F1P = F1NumEnd; F2P = F2NumEnd;
-}
-
-// 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 (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;
- }
-}
-
int main(int argc, char **argv) {
cl::ParseCommandLineOptions(argc, argv);
- // mmap in the files.
- unsigned File1Len, File2Len;
- char *File1Start, *File2Start;
- OpenFile(File1, File1Len, File1Start);
- OpenFile(File2, File2Len, File2Start);
-
- // Okay, now that we opened the files, scan them for the first difference.
- char *File1End = File1Start+File1Len;
- char *File2End = File2Start+File2Len;
- char *F1P = File1Start;
- char *F2P = File2Start;
-
- // Scan for the end of file or first difference.
- while (F1P < File1End && F2P < File2End && *F1P == *F2P)
- ++F1P, ++F2P;
-
- // Common case: identifical files.
- if (F1P == File1End && F2P == File2End) return 0;
-
- // If the files need padding, do so now.
- PadFileIfNeeded(File1Start, File1End, F1P);
- PadFileIfNeeded(File2Start, File2End, F2P);
-
- 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.
- CompareNumbers(F1P, F2P, File1End, File2End);
- }
-
- // 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 (F1AtEnd & F2AtEnd) return 0;
-
- // Otherwise, 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.
- CompareNumbers(F1P, F2P, File1End, File2End);
-
- // If we found the end, we succeeded.
- if (F1P >= File1End && F2P >= File2End) return 0;
-
- return 1;
+ std::string ErrorMsg;
+ int DF = DiffFilesWithTolerance(File1, File2, AbsTolerance, RelTolerance,
+ &ErrorMsg);
+ if (!ErrorMsg.empty())
+ errs() << argv[0] << ": " << ErrorMsg << "\n";
+ return DF;
}
projects / oota-llvm.git / blobdiff