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For PR797:

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Final remove of exception handling from this file. lib/System can no longer
throw exceptions so there's no need for try/catch blocks here.


git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@29848 91177308-0d34-0410-b5e6-96231b3b80d8
This commit is contained in:
Reid Spencer 2006-08-23 20:37:59 +00:00
parent 4c97bed5d9
commit 30493372f3
1 changed files with 82 additions and 90 deletions
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172
lib/Support/FileUtilities.cpp
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@ -164,97 +164,89 @@ int llvm::DiffFilesWithTolerance(const sys::Path &FileA,
if ((A_size == 0 || B_size == 0))
return 1;
try {
// 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)
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;
} catch (const std::string &Msg) {
if (Error) *Error = Msg;
// 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;
} catch (...) {
*Error = "Unknown Exception Occurred";
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)
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;
}