#include "llvm/Support/FileUtilities.h"
#include "llvm/System/Path.h"
#include "llvm/Support/MemoryBuffer.h"
#include "llvm/ADT/OwningPtr.h"
#include "llvm/ADT/SmallString.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': case 'd': 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 const char *BackupNumber(const char *Pos, const char *FirstChar) {
if (!isNumberChar(*Pos)) return Pos;
while (Pos > FirstChar && isNumberChar(Pos[-1])) {
--Pos;
if (Pos > FirstChar && isSignedChar(Pos[0]) && !isExponentChar(Pos[-1]))
break;
}
return Pos;
}
static const char *EndOfNumber(const char *Pos) {
while (isNumberChar(*Pos))
++Pos;
return Pos;
}
static bool CompareNumbers(const char *&F1P, const char *&F2P,
const char *F1End, const char *F2End,
double AbsTolerance, double RelTolerance,
std::string *ErrorMsg) {
const char *F1NumEnd, *F2NumEnd;
double V1 = 0.0, V2 = 0.0;
while (isspace(*F1P) && F1P != F1End)
++F1P;
while (isspace(*F2P) && F2P != F2End)
++F2P;
if (!isNumberChar(*F1P) || !isNumberChar(*F2P)) {
F1NumEnd = F1P;
F2NumEnd = F2P;
} else {
V1 = strtod(F1P, const_cast<char**>(&F1NumEnd));
V2 = strtod(F2P, const_cast<char**>(&F2NumEnd));
if (*F1NumEnd == 'D' || *F1NumEnd == 'd') {
SmallString<200> StrTmp(F1P, EndOfNumber(F1NumEnd)+1);
StrTmp[static_cast<unsigned>(F1NumEnd-F1P)] = 'e';
V1 = strtod(&StrTmp[0], const_cast<char**>(&F1NumEnd));
F1NumEnd = F1P + (F1NumEnd-&StrTmp[0]);
}
if (*F2NumEnd == 'D' || *F2NumEnd == 'd') {
SmallString<200> StrTmp(F2P, EndOfNumber(F2NumEnd)+1);
StrTmp[static_cast<unsigned>(F2NumEnd-F2P)] = 'e';
V2 = strtod(&StrTmp[0], const_cast<char**>(&F2NumEnd));
F2NumEnd = F2P + (F2NumEnd-&StrTmp[0]);
}
}
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;
}
if (AbsTolerance < std::abs(V1-V2)) {
double Diff;
if (V2)
Diff = std::abs(V1/V2 - 1.0);
else if (V1)
Diff = std::abs(V2/V1 - 1.0);
else
Diff = 0; 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;
}
}
F1P = F1NumEnd; F2P = F2NumEnd;
return false;
}
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;
size_t A_size = FileAStat->getSize();
size_t B_size = FileBStat->getSize();
if (A_size == 0 && B_size == 0)
return 0;
if ((A_size == 0 || B_size == 0)) {
if (Error)
*Error = "Files differ: one is zero-sized, the other isn't";
return 1;
}
OwningPtr<MemoryBuffer> F1(MemoryBuffer::getFile(FileA.c_str(), Error));
OwningPtr<MemoryBuffer> F2(MemoryBuffer::getFile(FileB.c_str(), Error));
if (F1 == 0 || F2 == 0)
return 2;
const char *File1Start = F1->getBufferStart();
const char *File2Start = F2->getBufferStart();
const char *File1End = F1->getBufferEnd();
const char *File2End = F2->getBufferEnd();
const char *F1P = File1Start;
const char *F2P = File2Start;
if (A_size == B_size) {
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; }
}
bool CompareFailed = false;
while (1) {
while (F1P < File1End && F2P < File2End && *F1P == *F2P)
++F1P, ++F2P;
if (F1P >= File1End || F2P >= File2End) break;
F1P = BackupNumber(F1P, File1Start);
F2P = BackupNumber(F2P, File2Start);
if (CompareNumbers(F1P, F2P, File1End, File2End, AbsTol, RelTol, Error)) {
CompareFailed = true;
break;
}
}
bool F1AtEnd = F1P >= File1End;
bool F2AtEnd = F2P >= File2End;
if (!CompareFailed && (!F1AtEnd || !F2AtEnd)) {
if (F1AtEnd && isNumberChar(F1P[-1])) --F1P;
if (F2AtEnd && isNumberChar(F2P[-1])) --F2P;
F1P = BackupNumber(F1P, File1Start);
F2P = BackupNumber(F2P, File2Start);
if (CompareNumbers(F1P, F2P, File1End, File2End, AbsTol, RelTol, Error))
CompareFailed = true;
if (F1P < File1End || F2P < File2End)
CompareFailed = true;
}
return CompareFailed;
}