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https://github.com/c64scene-ar/llvm-6502.git
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c95b5604e0
git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@19769 91177308-0d34-0410-b5e6-96231b3b80d8
251 lines
8.5 KiB
C++
251 lines
8.5 KiB
C++
//===- Support/FileUtilities.cpp - File System Utilities ------------------===//
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//
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// The LLVM Compiler Infrastructure
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//
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// This file was developed by the LLVM research group and is distributed under
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// the University of Illinois Open Source License. See LICENSE.TXT for details.
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//
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//===----------------------------------------------------------------------===//
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//
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// This file implements a family of utility functions which are useful for doing
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// various things with files.
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//
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//===----------------------------------------------------------------------===//
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#include "llvm/Support/FileUtilities.h"
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#include "llvm/System/Path.h"
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#include "llvm/System/MappedFile.h"
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#include "llvm/ADT/StringExtras.h"
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#include <cmath>
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#include <fstream>
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#include <iostream>
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using namespace llvm;
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/// DiffFiles - Compare the two files specified, returning true if they are
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/// different or if there is a file error. If you specify a string to fill in
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/// for the error option, it will set the string to an error message if an error
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/// occurs, allowing the caller to distinguish between a failed diff and a file
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/// system error.
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///
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bool llvm::DiffFiles(const std::string &FileA, const std::string &FileB,
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std::string *Error) {
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std::ios::openmode io_mode = std::ios::in | std::ios::binary;
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std::ifstream FileAStream(FileA.c_str(), io_mode);
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if (!FileAStream) {
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if (Error) *Error = "Couldn't open file '" + FileA + "'";
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return true;
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}
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std::ifstream FileBStream(FileB.c_str(), io_mode);
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if (!FileBStream) {
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if (Error) *Error = "Couldn't open file '" + FileB + "'";
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return true;
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}
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// Compare the two files...
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int C1, C2;
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do {
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C1 = FileAStream.get();
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C2 = FileBStream.get();
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if (C1 != C2) return true;
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} while (C1 != EOF);
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return false;
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}
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/// MoveFileOverIfUpdated - If the file specified by New is different than Old,
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/// or if Old does not exist, move the New file over the Old file. Otherwise,
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/// remove the New file.
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///
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void llvm::MoveFileOverIfUpdated(const std::string &New,
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const std::string &Old) {
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if (DiffFiles(New, Old)) {
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if (std::rename(New.c_str(), Old.c_str()))
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std::cerr << "Error renaming '" << New << "' to '" << Old << "'!\n";
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} else {
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std::remove(New.c_str());
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}
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}
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static bool isNumberChar(char C) {
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switch (C) {
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case '0': case '1': case '2': case '3': case '4':
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case '5': case '6': case '7': case '8': case '9':
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case '.': case '+': case '-':
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case 'e':
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case 'E': return true;
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default: return false;
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}
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}
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static char *BackupNumber(char *Pos, char *FirstChar) {
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// If we didn't stop in the middle of a number, don't backup.
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if (!isNumberChar(*Pos)) return Pos;
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// Otherwise, return to the start of the number.
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while (Pos > FirstChar && isNumberChar(Pos[-1]))
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--Pos;
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return Pos;
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}
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/// CompareNumbers - compare two numbers, returning true if they are different.
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static bool CompareNumbers(char *&F1P, char *&F2P, char *F1End, char *F2End,
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double AbsTolerance, double RelTolerance,
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std::string *ErrorMsg) {
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char *F1NumEnd, *F2NumEnd;
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double V1 = 0.0, V2 = 0.0;
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// If we stop on numbers, compare their difference.
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if (isNumberChar(*F1P) && isNumberChar(*F2P)) {
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V1 = strtod(F1P, &F1NumEnd);
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V2 = strtod(F2P, &F2NumEnd);
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} else {
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// Otherwise, the diff failed.
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F1NumEnd = F1P;
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F2NumEnd = F2P;
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}
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if (F1NumEnd == F1P || F2NumEnd == F2P) {
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if (ErrorMsg) *ErrorMsg = "Comparison failed, not a numeric difference.";
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return true;
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}
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// Check to see if these are inside the absolute tolerance
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if (AbsTolerance < std::abs(V1-V2)) {
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// Nope, check the relative tolerance...
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double Diff;
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if (V2)
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Diff = std::abs(V1/V2 - 1.0);
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else if (V1)
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Diff = std::abs(V2/V1 - 1.0);
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else
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Diff = 0; // Both zero.
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if (Diff > RelTolerance) {
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if (ErrorMsg) {
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*ErrorMsg = "Compared: " + ftostr(V1) + " and " + ftostr(V2) +
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": diff = " + ftostr(Diff) + "\n";
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*ErrorMsg += "Out of tolerance: rel/abs: " + ftostr(RelTolerance) +
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"/" + ftostr(AbsTolerance);
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}
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return true;
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}
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}
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// Otherwise, advance our read pointers to the end of the numbers.
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F1P = F1NumEnd; F2P = F2NumEnd;
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return false;
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}
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// PadFileIfNeeded - If the files are not identical, we will have to be doing
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// numeric comparisons in here. There are bad cases involved where we (i.e.,
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// strtod) might run off the beginning or end of the file if it starts or ends
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// with a number. Because of this, if needed, we pad the file so that it starts
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// and ends with a null character.
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static void PadFileIfNeeded(char *&FileStart, char *&FileEnd, char *&FP) {
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if (isNumberChar(FileStart[0]) || isNumberChar(FileEnd[-1])) {
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unsigned FileLen = FileEnd-FileStart;
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char *NewFile = new char[FileLen+2];
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NewFile[0] = 0; // Add null padding
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NewFile[FileLen+1] = 0; // Add null padding
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memcpy(NewFile+1, FileStart, FileLen);
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FP = NewFile+(FP-FileStart)+1;
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FileStart = NewFile+1;
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FileEnd = FileStart+FileLen;
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}
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}
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/// DiffFilesWithTolerance - Compare the two files specified, returning 0 if the
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/// files match, 1 if they are different, and 2 if there is a file error. This
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/// function differs from DiffFiles in that you can specify an absolete and
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/// relative FP error that is allowed to exist. If you specify a string to fill
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/// in for the error option, it will set the string to an error message if an
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/// error occurs, allowing the caller to distinguish between a failed diff and a
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/// file system error.
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///
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int llvm::DiffFilesWithTolerance(const std::string &FileA,
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const std::string &FileB,
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double AbsTol, double RelTol,
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std::string *Error) {
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try {
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// Map in the files into memory.
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sys::MappedFile F1((sys::Path(FileA)));
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sys::MappedFile F2((sys::Path(FileB)));
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F1.map();
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F2.map();
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// Okay, now that we opened the files, scan them for the first difference.
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char *File1Start = F1.charBase();
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char *File2Start = F2.charBase();
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char *File1End = File1Start+F1.size();
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char *File2End = File2Start+F2.size();
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char *F1P = File1Start;
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char *F2P = File2Start;
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// Scan for the end of file or first difference.
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while (F1P < File1End && F2P < File2End && *F1P == *F2P)
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++F1P, ++F2P;
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// Common case: identifical files.
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if (F1P == File1End && F2P == File2End) return 0;
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char *OrigFile1Start = File1Start;
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char *OrigFile2Start = File2Start;
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// If the files need padding, do so now.
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PadFileIfNeeded(File1Start, File1End, F1P);
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PadFileIfNeeded(File2Start, File2End, F2P);
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bool CompareFailed = false;
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while (1) {
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// Scan for the end of file or next difference.
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while (F1P < File1End && F2P < File2End && *F1P == *F2P)
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++F1P, ++F2P;
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if (F1P >= File1End || F2P >= File2End) break;
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// Okay, we must have found a difference. Backup to the start of the
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// current number each stream is at so that we can compare from the
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// beginning.
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F1P = BackupNumber(F1P, File1Start);
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F2P = BackupNumber(F2P, File2Start);
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// Now that we are at the start of the numbers, compare them, exiting if
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// they don't match.
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if (CompareNumbers(F1P, F2P, File1End, File2End, AbsTol, RelTol, Error)) {
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CompareFailed = true;
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break;
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}
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}
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// Okay, we reached the end of file. If both files are at the end, we
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// succeeded.
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bool F1AtEnd = F1P >= File1End;
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bool F2AtEnd = F2P >= File2End;
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if (!CompareFailed && (!F1AtEnd || !F2AtEnd)) {
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// Else, we might have run off the end due to a number: backup and retry.
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if (F1AtEnd && isNumberChar(F1P[-1])) --F1P;
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if (F2AtEnd && isNumberChar(F2P[-1])) --F2P;
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F1P = BackupNumber(F1P, File1Start);
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F2P = BackupNumber(F2P, File2Start);
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// Now that we are at the start of the numbers, compare them, exiting if
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// they don't match.
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if (CompareNumbers(F1P, F2P, File1End, File2End, AbsTol, RelTol, Error))
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CompareFailed = true;
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// If we found the end, we succeeded.
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if (F1P < File1End || F2P < File2End)
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CompareFailed = true;
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}
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if (OrigFile1Start != File1Start)
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delete[] File1Start-1; // Back up past null byte
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if (OrigFile2Start != File2Start)
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delete[] File2Start-1; // Back up past null byte
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return CompareFailed;
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} catch (const std::string &Msg) {
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if (Error) *Error = Msg;
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return 2;
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}
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}
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