//===- Support/FileUtilities.cpp - File System Utilities ------------------===//
-//
+//
// 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 implements a family of utility functions which are useful for doing
#include "llvm/System/MappedFile.h"
#include "llvm/ADT/StringExtras.h"
#include <cmath>
+#include <cstring>
+#include <cctype>
using namespace llvm;
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 '5': case '6': case '7': case '8': case '9':
case '.': case '+': case '-':
+ case 'D': // Strange exponential notation.
+ case 'd': // Strange exponential notation.
case 'e':
case 'E': return true;
default: return false;
double AbsTolerance, double RelTolerance,
std::string *ErrorMsg) {
char *F1NumEnd, *F2NumEnd;
- double V1 = 0.0, V2 = 0.0;
- // If we stop on numbers, compare their difference.
+ 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)) {
- V1 = strtod(F1P, &F1NumEnd);
- V2 = strtod(F2P, &F2NumEnd);
+ 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;
// 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])) {
+ 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
double AbsTol, double RelTol,
std::string *Error) {
try {
- // Map in the files into memory.
+ // 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();
// Okay, now that we opened the files, scan them for the first difference.
char *File1Start = F1.charBase();
char *File2Start = F2.charBase();
- char *File1End = File1Start+F1.size();
- char *File2End = File2Start+F2.size();
+ char *File1End = File1Start+A_size;
+ char *File2End = File2Start+B_size;
char *F1P = File1Start;
char *F2P = File2Start;
- // Scan for the end of file or first difference.
- while (F1P < File1End && F2P < File2End && *F1P == *F2P)
- ++F1P, ++F2P;
+ if (A_size == B_size) {
+ // Are the buffers identical?
+ if (std::memcmp(File1Start, File2Start, A_size) == 0)
+ return 0;
- // Common case: identifical files.
- if (F1P == File1End && F2P == File2End) return 0;
-
- if (AbsTol == 0 && RelTol == 0)
- return 1; // Files different!
+ if (AbsTol == 0 && RelTol == 0)
+ 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.