17a6ff2b98e0c7d4c54a4c04edb4357371f34d17fChris Lattner//===- Support/FileUtilities.cpp - File System Utilities ------------------===// 2f976c856fcc5055f3fc7d9f070d72c2d027c1d9dMisha Brukman// 3b576c94c15af9a440f69d9d03c2afead7971118cJohn Criswell// The LLVM Compiler Infrastructure 4b576c94c15af9a440f69d9d03c2afead7971118cJohn Criswell// 54ee451de366474b9c228b4e5fa573795a715216dChris Lattner// This file is distributed under the University of Illinois Open Source 64ee451de366474b9c228b4e5fa573795a715216dChris Lattner// License. See LICENSE.TXT for details. 7f976c856fcc5055f3fc7d9f070d72c2d027c1d9dMisha Brukman// 8b576c94c15af9a440f69d9d03c2afead7971118cJohn Criswell//===----------------------------------------------------------------------===// 97a6ff2b98e0c7d4c54a4c04edb4357371f34d17fChris Lattner// 107a6ff2b98e0c7d4c54a4c04edb4357371f34d17fChris Lattner// This file implements a family of utility functions which are useful for doing 117a6ff2b98e0c7d4c54a4c04edb4357371f34d17fChris Lattner// various things with files. 127a6ff2b98e0c7d4c54a4c04edb4357371f34d17fChris Lattner// 137a6ff2b98e0c7d4c54a4c04edb4357371f34d17fChris Lattner//===----------------------------------------------------------------------===// 147a6ff2b98e0c7d4c54a4c04edb4357371f34d17fChris Lattner 15551ccae044b0ff658fe629dd67edd5ffe75d10e8Reid Spencer#include "llvm/Support/FileUtilities.h" 16a7750c1142baa5ad812d5209526a0b6568201e0eChris Lattner#include "llvm/Support/MemoryBuffer.h" 175908839cedfa4cfb3b7a89db01f987c47e64aa90Benjamin Kramer#include "llvm/Support/raw_ostream.h" 181f6efa3996dd1929fbc129203ce5009b620e6969Michael J. Spencer#include "llvm/Support/Path.h" 19333fb04506233255f10d8095c9e2de5e5f0fdc6fMichael J. Spencer#include "llvm/Support/system_error.h" 20a7750c1142baa5ad812d5209526a0b6568201e0eChris Lattner#include "llvm/ADT/OwningPtr.h" 21a7750c1142baa5ad812d5209526a0b6568201e0eChris Lattner#include "llvm/ADT/SmallString.h" 22ae9f3a3b7c915f725aef5a7250e88eaeddda03c6Anton Korobeynikov#include <cstdlib> 232ee51cbeb8f83f0b04d9611535151c801bbe3d4bChris Lattner#include <cstring> 24c0d0e77042ef85ade9145ff2e922487a6e49cc07Chris Lattner#include <cctype> 252cdd21c2e4d855500dfb53f77aa74da53ccf9de6Chris Lattnerusing namespace llvm; 26d0fde30ce850b78371fd1386338350591f9ff494Brian Gaeke 27599ddf9a7693a315a03fc77cf612eec53dee5f67Lauro Ramos Venanciostatic bool isSignedChar(char C) { 2842f6e455de71099d12d30dc928748147bfc8f801Lauro Ramos Venancio return (C == '+' || C == '-'); 29599ddf9a7693a315a03fc77cf612eec53dee5f67Lauro Ramos Venancio} 30599ddf9a7693a315a03fc77cf612eec53dee5f67Lauro Ramos Venancio 3142f6e455de71099d12d30dc928748147bfc8f801Lauro Ramos Venanciostatic bool isExponentChar(char C) { 3244542539233acdaf1a72179cd38506478b432de9Chris Lattner switch (C) { 338dcd5483bce94be0ac02dd5c8b749a9a2458ee2bChris Lattner case 'D': // Strange exponential notation. 348dcd5483bce94be0ac02dd5c8b749a9a2458ee2bChris Lattner case 'd': // Strange exponential notation. 3544542539233acdaf1a72179cd38506478b432de9Chris Lattner case 'e': 3644542539233acdaf1a72179cd38506478b432de9Chris Lattner case 'E': return true; 3744542539233acdaf1a72179cd38506478b432de9Chris Lattner default: return false; 3844542539233acdaf1a72179cd38506478b432de9Chris Lattner } 3944542539233acdaf1a72179cd38506478b432de9Chris Lattner} 4044542539233acdaf1a72179cd38506478b432de9Chris Lattner 41599ddf9a7693a315a03fc77cf612eec53dee5f67Lauro Ramos Venanciostatic bool isNumberChar(char C) { 42599ddf9a7693a315a03fc77cf612eec53dee5f67Lauro Ramos Venancio switch (C) { 43599ddf9a7693a315a03fc77cf612eec53dee5f67Lauro Ramos Venancio case '0': case '1': case '2': case '3': case '4': 44599ddf9a7693a315a03fc77cf612eec53dee5f67Lauro Ramos Venancio case '5': case '6': case '7': case '8': case '9': 45599ddf9a7693a315a03fc77cf612eec53dee5f67Lauro Ramos Venancio case '.': return true; 4642f6e455de71099d12d30dc928748147bfc8f801Lauro Ramos Venancio default: return isSignedChar(C) || isExponentChar(C); 47599ddf9a7693a315a03fc77cf612eec53dee5f67Lauro Ramos Venancio } 48599ddf9a7693a315a03fc77cf612eec53dee5f67Lauro Ramos Venancio} 49599ddf9a7693a315a03fc77cf612eec53dee5f67Lauro Ramos Venancio 50a7750c1142baa5ad812d5209526a0b6568201e0eChris Lattnerstatic const char *BackupNumber(const char *Pos, const char *FirstChar) { 5144542539233acdaf1a72179cd38506478b432de9Chris Lattner // If we didn't stop in the middle of a number, don't backup. 5244542539233acdaf1a72179cd38506478b432de9Chris Lattner if (!isNumberChar(*Pos)) return Pos; 5344542539233acdaf1a72179cd38506478b432de9Chris Lattner 5444542539233acdaf1a72179cd38506478b432de9Chris Lattner // Otherwise, return to the start of the number. 55d1c82fe726a8776cb965c5bf1f6f6c0d311ef6bcDaniel Dunbar bool HasPeriod = false; 56599ddf9a7693a315a03fc77cf612eec53dee5f67Lauro Ramos Venancio while (Pos > FirstChar && isNumberChar(Pos[-1])) { 57d1c82fe726a8776cb965c5bf1f6f6c0d311ef6bcDaniel Dunbar // Backup over at most one period. 58d1c82fe726a8776cb965c5bf1f6f6c0d311ef6bcDaniel Dunbar if (Pos[-1] == '.') { 59d1c82fe726a8776cb965c5bf1f6f6c0d311ef6bcDaniel Dunbar if (HasPeriod) 60d1c82fe726a8776cb965c5bf1f6f6c0d311ef6bcDaniel Dunbar break; 61d1c82fe726a8776cb965c5bf1f6f6c0d311ef6bcDaniel Dunbar HasPeriod = true; 62d1c82fe726a8776cb965c5bf1f6f6c0d311ef6bcDaniel Dunbar } 63d1c82fe726a8776cb965c5bf1f6f6c0d311ef6bcDaniel Dunbar 6444542539233acdaf1a72179cd38506478b432de9Chris Lattner --Pos; 6542f6e455de71099d12d30dc928748147bfc8f801Lauro Ramos Venancio if (Pos > FirstChar && isSignedChar(Pos[0]) && !isExponentChar(Pos[-1])) 66599ddf9a7693a315a03fc77cf612eec53dee5f67Lauro Ramos Venancio break; 67599ddf9a7693a315a03fc77cf612eec53dee5f67Lauro Ramos Venancio } 6844542539233acdaf1a72179cd38506478b432de9Chris Lattner return Pos; 6944542539233acdaf1a72179cd38506478b432de9Chris Lattner} 7044542539233acdaf1a72179cd38506478b432de9Chris Lattner 71a7750c1142baa5ad812d5209526a0b6568201e0eChris Lattner/// EndOfNumber - Return the first character that is not part of the specified 72a7750c1142baa5ad812d5209526a0b6568201e0eChris Lattner/// number. This assumes that the buffer is null terminated, so it won't fall 73a7750c1142baa5ad812d5209526a0b6568201e0eChris Lattner/// off the end. 74a7750c1142baa5ad812d5209526a0b6568201e0eChris Lattnerstatic const char *EndOfNumber(const char *Pos) { 75a7750c1142baa5ad812d5209526a0b6568201e0eChris Lattner while (isNumberChar(*Pos)) 76a7750c1142baa5ad812d5209526a0b6568201e0eChris Lattner ++Pos; 77a7750c1142baa5ad812d5209526a0b6568201e0eChris Lattner return Pos; 78a7750c1142baa5ad812d5209526a0b6568201e0eChris Lattner} 79a7750c1142baa5ad812d5209526a0b6568201e0eChris Lattner 8044542539233acdaf1a72179cd38506478b432de9Chris Lattner/// CompareNumbers - compare two numbers, returning true if they are different. 81a7750c1142baa5ad812d5209526a0b6568201e0eChris Lattnerstatic bool CompareNumbers(const char *&F1P, const char *&F2P, 82a7750c1142baa5ad812d5209526a0b6568201e0eChris Lattner const char *F1End, const char *F2End, 8344542539233acdaf1a72179cd38506478b432de9Chris Lattner double AbsTolerance, double RelTolerance, 8444542539233acdaf1a72179cd38506478b432de9Chris Lattner std::string *ErrorMsg) { 85a7750c1142baa5ad812d5209526a0b6568201e0eChris Lattner const char *F1NumEnd, *F2NumEnd; 86f976c856fcc5055f3fc7d9f070d72c2d027c1d9dMisha Brukman double V1 = 0.0, V2 = 0.0; 87c0d0e77042ef85ade9145ff2e922487a6e49cc07Chris Lattner 88c0d0e77042ef85ade9145ff2e922487a6e49cc07Chris Lattner // If one of the positions is at a space and the other isn't, chomp up 'til 89c0d0e77042ef85ade9145ff2e922487a6e49cc07Chris Lattner // the end of the space. 90c0d0e77042ef85ade9145ff2e922487a6e49cc07Chris Lattner while (isspace(*F1P) && F1P != F1End) 91c0d0e77042ef85ade9145ff2e922487a6e49cc07Chris Lattner ++F1P; 92c0d0e77042ef85ade9145ff2e922487a6e49cc07Chris Lattner while (isspace(*F2P) && F2P != F2End) 93c0d0e77042ef85ade9145ff2e922487a6e49cc07Chris Lattner ++F2P; 94c0d0e77042ef85ade9145ff2e922487a6e49cc07Chris Lattner 95a7750c1142baa5ad812d5209526a0b6568201e0eChris Lattner // If we stop on numbers, compare their difference. 96a7750c1142baa5ad812d5209526a0b6568201e0eChris Lattner if (!isNumberChar(*F1P) || !isNumberChar(*F2P)) { 97a7750c1142baa5ad812d5209526a0b6568201e0eChris Lattner // The diff failed. 9844542539233acdaf1a72179cd38506478b432de9Chris Lattner F1NumEnd = F1P; 9944542539233acdaf1a72179cd38506478b432de9Chris Lattner F2NumEnd = F2P; 100a7750c1142baa5ad812d5209526a0b6568201e0eChris Lattner } else { 101a7750c1142baa5ad812d5209526a0b6568201e0eChris Lattner // Note that some ugliness is built into this to permit support for numbers 102a7750c1142baa5ad812d5209526a0b6568201e0eChris Lattner // that use "D" or "d" as their exponential marker, e.g. "1.234D45". This 103a7750c1142baa5ad812d5209526a0b6568201e0eChris Lattner // occurs in 200.sixtrack in spec2k. 104a7750c1142baa5ad812d5209526a0b6568201e0eChris Lattner V1 = strtod(F1P, const_cast<char**>(&F1NumEnd)); 105a7750c1142baa5ad812d5209526a0b6568201e0eChris Lattner V2 = strtod(F2P, const_cast<char**>(&F2NumEnd)); 106a7750c1142baa5ad812d5209526a0b6568201e0eChris Lattner 107a7750c1142baa5ad812d5209526a0b6568201e0eChris Lattner if (*F1NumEnd == 'D' || *F1NumEnd == 'd') { 108a7750c1142baa5ad812d5209526a0b6568201e0eChris Lattner // Copy string into tmp buffer to replace the 'D' with an 'e'. 109a7750c1142baa5ad812d5209526a0b6568201e0eChris Lattner SmallString<200> StrTmp(F1P, EndOfNumber(F1NumEnd)+1); 11034cd4a484e532cc463fd5a4bf59b88d13c5467c1Evan Cheng // Strange exponential notation! 11134cd4a484e532cc463fd5a4bf59b88d13c5467c1Evan Cheng StrTmp[static_cast<unsigned>(F1NumEnd-F1P)] = 'e'; 112333ad3f2bf2941618f8e1563da022da011e615c0Michael J. Spencer 113a7750c1142baa5ad812d5209526a0b6568201e0eChris Lattner V1 = strtod(&StrTmp[0], const_cast<char**>(&F1NumEnd)); 114a7750c1142baa5ad812d5209526a0b6568201e0eChris Lattner F1NumEnd = F1P + (F1NumEnd-&StrTmp[0]); 115a7750c1142baa5ad812d5209526a0b6568201e0eChris Lattner } 116333ad3f2bf2941618f8e1563da022da011e615c0Michael J. Spencer 117a7750c1142baa5ad812d5209526a0b6568201e0eChris Lattner if (*F2NumEnd == 'D' || *F2NumEnd == 'd') { 118a7750c1142baa5ad812d5209526a0b6568201e0eChris Lattner // Copy string into tmp buffer to replace the 'D' with an 'e'. 119a7750c1142baa5ad812d5209526a0b6568201e0eChris Lattner SmallString<200> StrTmp(F2P, EndOfNumber(F2NumEnd)+1); 12034cd4a484e532cc463fd5a4bf59b88d13c5467c1Evan Cheng // Strange exponential notation! 12134cd4a484e532cc463fd5a4bf59b88d13c5467c1Evan Cheng StrTmp[static_cast<unsigned>(F2NumEnd-F2P)] = 'e'; 122333ad3f2bf2941618f8e1563da022da011e615c0Michael J. Spencer 123a7750c1142baa5ad812d5209526a0b6568201e0eChris Lattner V2 = strtod(&StrTmp[0], const_cast<char**>(&F2NumEnd)); 124a7750c1142baa5ad812d5209526a0b6568201e0eChris Lattner F2NumEnd = F2P + (F2NumEnd-&StrTmp[0]); 125a7750c1142baa5ad812d5209526a0b6568201e0eChris Lattner } 12644542539233acdaf1a72179cd38506478b432de9Chris Lattner } 12744542539233acdaf1a72179cd38506478b432de9Chris Lattner 12844542539233acdaf1a72179cd38506478b432de9Chris Lattner if (F1NumEnd == F1P || F2NumEnd == F2P) { 129bfb8eaff7356543c7f59394c74a0229684dad222Reid Spencer if (ErrorMsg) { 130bfb8eaff7356543c7f59394c74a0229684dad222Reid Spencer *ErrorMsg = "FP Comparison failed, not a numeric difference between '"; 131bfb8eaff7356543c7f59394c74a0229684dad222Reid Spencer *ErrorMsg += F1P[0]; 132bfb8eaff7356543c7f59394c74a0229684dad222Reid Spencer *ErrorMsg += "' and '"; 133bfb8eaff7356543c7f59394c74a0229684dad222Reid Spencer *ErrorMsg += F2P[0]; 134bfb8eaff7356543c7f59394c74a0229684dad222Reid Spencer *ErrorMsg += "'"; 135bfb8eaff7356543c7f59394c74a0229684dad222Reid Spencer } 13644542539233acdaf1a72179cd38506478b432de9Chris Lattner return true; 13744542539233acdaf1a72179cd38506478b432de9Chris Lattner } 13844542539233acdaf1a72179cd38506478b432de9Chris Lattner 13944542539233acdaf1a72179cd38506478b432de9Chris Lattner // Check to see if these are inside the absolute tolerance 14044542539233acdaf1a72179cd38506478b432de9Chris Lattner if (AbsTolerance < std::abs(V1-V2)) { 14144542539233acdaf1a72179cd38506478b432de9Chris Lattner // Nope, check the relative tolerance... 14244542539233acdaf1a72179cd38506478b432de9Chris Lattner double Diff; 14344542539233acdaf1a72179cd38506478b432de9Chris Lattner if (V2) 14444542539233acdaf1a72179cd38506478b432de9Chris Lattner Diff = std::abs(V1/V2 - 1.0); 14544542539233acdaf1a72179cd38506478b432de9Chris Lattner else if (V1) 14644542539233acdaf1a72179cd38506478b432de9Chris Lattner Diff = std::abs(V2/V1 - 1.0); 14744542539233acdaf1a72179cd38506478b432de9Chris Lattner else 14844542539233acdaf1a72179cd38506478b432de9Chris Lattner Diff = 0; // Both zero. 14944542539233acdaf1a72179cd38506478b432de9Chris Lattner if (Diff > RelTolerance) { 15044542539233acdaf1a72179cd38506478b432de9Chris Lattner if (ErrorMsg) { 1515908839cedfa4cfb3b7a89db01f987c47e64aa90Benjamin Kramer raw_string_ostream(*ErrorMsg) 1525908839cedfa4cfb3b7a89db01f987c47e64aa90Benjamin Kramer << "Compared: " << V1 << " and " << V2 << '\n' 1535908839cedfa4cfb3b7a89db01f987c47e64aa90Benjamin Kramer << "abs. diff = " << std::abs(V1-V2) << " rel.diff = " << Diff << '\n' 1545908839cedfa4cfb3b7a89db01f987c47e64aa90Benjamin Kramer << "Out of tolerance: rel/abs: " << RelTolerance << '/' 1555908839cedfa4cfb3b7a89db01f987c47e64aa90Benjamin Kramer << AbsTolerance; 15644542539233acdaf1a72179cd38506478b432de9Chris Lattner } 15744542539233acdaf1a72179cd38506478b432de9Chris Lattner return true; 15844542539233acdaf1a72179cd38506478b432de9Chris Lattner } 15944542539233acdaf1a72179cd38506478b432de9Chris Lattner } 16044542539233acdaf1a72179cd38506478b432de9Chris Lattner 16144542539233acdaf1a72179cd38506478b432de9Chris Lattner // Otherwise, advance our read pointers to the end of the numbers. 16244542539233acdaf1a72179cd38506478b432de9Chris Lattner F1P = F1NumEnd; F2P = F2NumEnd; 16344542539233acdaf1a72179cd38506478b432de9Chris Lattner return false; 16444542539233acdaf1a72179cd38506478b432de9Chris Lattner} 16544542539233acdaf1a72179cd38506478b432de9Chris Lattner 16644542539233acdaf1a72179cd38506478b432de9Chris Lattner/// DiffFilesWithTolerance - Compare the two files specified, returning 0 if the 16744542539233acdaf1a72179cd38506478b432de9Chris Lattner/// files match, 1 if they are different, and 2 if there is a file error. This 16844542539233acdaf1a72179cd38506478b432de9Chris Lattner/// function differs from DiffFiles in that you can specify an absolete and 16944542539233acdaf1a72179cd38506478b432de9Chris Lattner/// relative FP error that is allowed to exist. If you specify a string to fill 17044542539233acdaf1a72179cd38506478b432de9Chris Lattner/// in for the error option, it will set the string to an error message if an 17144542539233acdaf1a72179cd38506478b432de9Chris Lattner/// error occurs, allowing the caller to distinguish between a failed diff and a 17244542539233acdaf1a72179cd38506478b432de9Chris Lattner/// file system error. 17344542539233acdaf1a72179cd38506478b432de9Chris Lattner/// 174c74b4615071151b20fb1f82b11f85c2a1ba53e75Reid Spencerint llvm::DiffFilesWithTolerance(const sys::PathWithStatus &FileA, 175c74b4615071151b20fb1f82b11f85c2a1ba53e75Reid Spencer const sys::PathWithStatus &FileB, 17644542539233acdaf1a72179cd38506478b432de9Chris Lattner double AbsTol, double RelTol, 17744542539233acdaf1a72179cd38506478b432de9Chris Lattner std::string *Error) { 1788475ec068c213d0bf73f7686d82491a8f12e3b32Reid Spencer const sys::FileStatus *FileAStat = FileA.getFileStatus(false, Error); 1798475ec068c213d0bf73f7686d82491a8f12e3b32Reid Spencer if (!FileAStat) 180252ad03d7db0add504fdcc6bd67c1bc1e28bdd57Chris Lattner return 2; 1818475ec068c213d0bf73f7686d82491a8f12e3b32Reid Spencer const sys::FileStatus *FileBStat = FileB.getFileStatus(false, Error); 1828475ec068c213d0bf73f7686d82491a8f12e3b32Reid Spencer if (!FileBStat) 183862796959796d69fa490107d880854739660ffadReid Spencer return 2; 184862796959796d69fa490107d880854739660ffadReid Spencer 185252ad03d7db0add504fdcc6bd67c1bc1e28bdd57Chris Lattner // Check for zero length files because some systems croak when you try to 186252ad03d7db0add504fdcc6bd67c1bc1e28bdd57Chris Lattner // mmap an empty file. 1878475ec068c213d0bf73f7686d82491a8f12e3b32Reid Spencer size_t A_size = FileAStat->getSize(); 1888475ec068c213d0bf73f7686d82491a8f12e3b32Reid Spencer size_t B_size = FileBStat->getSize(); 189252ad03d7db0add504fdcc6bd67c1bc1e28bdd57Chris Lattner 190252ad03d7db0add504fdcc6bd67c1bc1e28bdd57Chris Lattner // If they are both zero sized then they're the same 191252ad03d7db0add504fdcc6bd67c1bc1e28bdd57Chris Lattner if (A_size == 0 && B_size == 0) 192252ad03d7db0add504fdcc6bd67c1bc1e28bdd57Chris Lattner return 0; 193bfb8eaff7356543c7f59394c74a0229684dad222Reid Spencer 194252ad03d7db0add504fdcc6bd67c1bc1e28bdd57Chris Lattner // If only one of them is zero sized then they can't be the same 195bfb8eaff7356543c7f59394c74a0229684dad222Reid Spencer if ((A_size == 0 || B_size == 0)) { 196bfb8eaff7356543c7f59394c74a0229684dad222Reid Spencer if (Error) 197bfb8eaff7356543c7f59394c74a0229684dad222Reid Spencer *Error = "Files differ: one is zero-sized, the other isn't"; 198252ad03d7db0add504fdcc6bd67c1bc1e28bdd57Chris Lattner return 1; 199bfb8eaff7356543c7f59394c74a0229684dad222Reid Spencer } 20045d55641fa3af536e48be446647ff51b15109992Reid Spencer 2017a2bdde0a0eebcd2125055e0eacaca040f0b766cChris Lattner // Now its safe to mmap the files into memory because both files 20230493372f3d403c9637eb479e7d0c4388b715c41Reid Spencer // have a non-zero size. 2033ff9563c3e391954b2e224afcf8b2b0fcc3888aaMichael J. Spencer OwningPtr<MemoryBuffer> F1; 2043ff9563c3e391954b2e224afcf8b2b0fcc3888aaMichael J. Spencer if (error_code ec = MemoryBuffer::getFile(FileA.c_str(), F1)) { 205333fb04506233255f10d8095c9e2de5e5f0fdc6fMichael J. Spencer if (Error) 206333fb04506233255f10d8095c9e2de5e5f0fdc6fMichael J. Spencer *Error = ec.message(); 207333fb04506233255f10d8095c9e2de5e5f0fdc6fMichael J. Spencer return 2; 208333fb04506233255f10d8095c9e2de5e5f0fdc6fMichael J. Spencer } 2093ff9563c3e391954b2e224afcf8b2b0fcc3888aaMichael J. Spencer OwningPtr<MemoryBuffer> F2; 2103ff9563c3e391954b2e224afcf8b2b0fcc3888aaMichael J. Spencer if (error_code ec = MemoryBuffer::getFile(FileB.c_str(), F2)) { 211333fb04506233255f10d8095c9e2de5e5f0fdc6fMichael J. Spencer if (Error) 212333fb04506233255f10d8095c9e2de5e5f0fdc6fMichael J. Spencer *Error = ec.message(); 21330493372f3d403c9637eb479e7d0c4388b715c41Reid Spencer return 2; 214333fb04506233255f10d8095c9e2de5e5f0fdc6fMichael J. Spencer } 215333fb04506233255f10d8095c9e2de5e5f0fdc6fMichael J. Spencer 21630493372f3d403c9637eb479e7d0c4388b715c41Reid Spencer // Okay, now that we opened the files, scan them for the first difference. 217a7750c1142baa5ad812d5209526a0b6568201e0eChris Lattner const char *File1Start = F1->getBufferStart(); 218a7750c1142baa5ad812d5209526a0b6568201e0eChris Lattner const char *File2Start = F2->getBufferStart(); 219a7750c1142baa5ad812d5209526a0b6568201e0eChris Lattner const char *File1End = F1->getBufferEnd(); 220a7750c1142baa5ad812d5209526a0b6568201e0eChris Lattner const char *File2End = F2->getBufferEnd(); 221a7750c1142baa5ad812d5209526a0b6568201e0eChris Lattner const char *F1P = File1Start; 222a7750c1142baa5ad812d5209526a0b6568201e0eChris Lattner const char *F2P = File2Start; 22330493372f3d403c9637eb479e7d0c4388b715c41Reid Spencer 22471907fbebf5a812b9a117574b196d8ff9561ac75Daniel Dunbar // Are the buffers identical? Common case: Handle this efficiently. 22571907fbebf5a812b9a117574b196d8ff9561ac75Daniel Dunbar if (A_size == B_size && 22671907fbebf5a812b9a117574b196d8ff9561ac75Daniel Dunbar std::memcmp(File1Start, File2Start, A_size) == 0) 22771907fbebf5a812b9a117574b196d8ff9561ac75Daniel Dunbar return 0; 22871907fbebf5a812b9a117574b196d8ff9561ac75Daniel Dunbar 22971907fbebf5a812b9a117574b196d8ff9561ac75Daniel Dunbar // Otherwise, we are done a tolerances are set. 23071907fbebf5a812b9a117574b196d8ff9561ac75Daniel Dunbar if (AbsTol == 0 && RelTol == 0) { 23171907fbebf5a812b9a117574b196d8ff9561ac75Daniel Dunbar if (Error) 23271907fbebf5a812b9a117574b196d8ff9561ac75Daniel Dunbar *Error = "Files differ without tolerance allowance"; 23371907fbebf5a812b9a117574b196d8ff9561ac75Daniel Dunbar return 1; // Files different! 23430493372f3d403c9637eb479e7d0c4388b715c41Reid Spencer } 23544542539233acdaf1a72179cd38506478b432de9Chris Lattner 23630493372f3d403c9637eb479e7d0c4388b715c41Reid Spencer bool CompareFailed = false; 23730493372f3d403c9637eb479e7d0c4388b715c41Reid Spencer while (1) { 23830493372f3d403c9637eb479e7d0c4388b715c41Reid Spencer // Scan for the end of file or next difference. 23930493372f3d403c9637eb479e7d0c4388b715c41Reid Spencer while (F1P < File1End && F2P < File2End && *F1P == *F2P) 24030493372f3d403c9637eb479e7d0c4388b715c41Reid Spencer ++F1P, ++F2P; 24144542539233acdaf1a72179cd38506478b432de9Chris Lattner 24230493372f3d403c9637eb479e7d0c4388b715c41Reid Spencer if (F1P >= File1End || F2P >= File2End) break; 24344542539233acdaf1a72179cd38506478b432de9Chris Lattner 24430493372f3d403c9637eb479e7d0c4388b715c41Reid Spencer // Okay, we must have found a difference. Backup to the start of the 24530493372f3d403c9637eb479e7d0c4388b715c41Reid Spencer // current number each stream is at so that we can compare from the 24630493372f3d403c9637eb479e7d0c4388b715c41Reid Spencer // beginning. 24730493372f3d403c9637eb479e7d0c4388b715c41Reid Spencer F1P = BackupNumber(F1P, File1Start); 24830493372f3d403c9637eb479e7d0c4388b715c41Reid Spencer F2P = BackupNumber(F2P, File2Start); 24944542539233acdaf1a72179cd38506478b432de9Chris Lattner 25030493372f3d403c9637eb479e7d0c4388b715c41Reid Spencer // Now that we are at the start of the numbers, compare them, exiting if 25130493372f3d403c9637eb479e7d0c4388b715c41Reid Spencer // they don't match. 25230493372f3d403c9637eb479e7d0c4388b715c41Reid Spencer if (CompareNumbers(F1P, F2P, File1End, File2End, AbsTol, RelTol, Error)) { 25330493372f3d403c9637eb479e7d0c4388b715c41Reid Spencer CompareFailed = true; 25430493372f3d403c9637eb479e7d0c4388b715c41Reid Spencer break; 25544542539233acdaf1a72179cd38506478b432de9Chris Lattner } 25630493372f3d403c9637eb479e7d0c4388b715c41Reid Spencer } 25744542539233acdaf1a72179cd38506478b432de9Chris Lattner 25830493372f3d403c9637eb479e7d0c4388b715c41Reid Spencer // Okay, we reached the end of file. If both files are at the end, we 25930493372f3d403c9637eb479e7d0c4388b715c41Reid Spencer // succeeded. 26030493372f3d403c9637eb479e7d0c4388b715c41Reid Spencer bool F1AtEnd = F1P >= File1End; 26130493372f3d403c9637eb479e7d0c4388b715c41Reid Spencer bool F2AtEnd = F2P >= File2End; 26230493372f3d403c9637eb479e7d0c4388b715c41Reid Spencer if (!CompareFailed && (!F1AtEnd || !F2AtEnd)) { 26330493372f3d403c9637eb479e7d0c4388b715c41Reid Spencer // Else, we might have run off the end due to a number: backup and retry. 26430493372f3d403c9637eb479e7d0c4388b715c41Reid Spencer if (F1AtEnd && isNumberChar(F1P[-1])) --F1P; 26530493372f3d403c9637eb479e7d0c4388b715c41Reid Spencer if (F2AtEnd && isNumberChar(F2P[-1])) --F2P; 26630493372f3d403c9637eb479e7d0c4388b715c41Reid Spencer F1P = BackupNumber(F1P, File1Start); 26730493372f3d403c9637eb479e7d0c4388b715c41Reid Spencer F2P = BackupNumber(F2P, File2Start); 26830493372f3d403c9637eb479e7d0c4388b715c41Reid Spencer 26930493372f3d403c9637eb479e7d0c4388b715c41Reid Spencer // Now that we are at the start of the numbers, compare them, exiting if 27030493372f3d403c9637eb479e7d0c4388b715c41Reid Spencer // they don't match. 27130493372f3d403c9637eb479e7d0c4388b715c41Reid Spencer if (CompareNumbers(F1P, F2P, File1End, File2End, AbsTol, RelTol, Error)) 27230493372f3d403c9637eb479e7d0c4388b715c41Reid Spencer CompareFailed = true; 27330493372f3d403c9637eb479e7d0c4388b715c41Reid Spencer 27430493372f3d403c9637eb479e7d0c4388b715c41Reid Spencer // If we found the end, we succeeded. 27530493372f3d403c9637eb479e7d0c4388b715c41Reid Spencer if (F1P < File1End || F2P < File2End) 27630493372f3d403c9637eb479e7d0c4388b715c41Reid Spencer CompareFailed = true; 27744542539233acdaf1a72179cd38506478b432de9Chris Lattner } 27830493372f3d403c9637eb479e7d0c4388b715c41Reid Spencer 27930493372f3d403c9637eb479e7d0c4388b715c41Reid Spencer return CompareFailed; 28044542539233acdaf1a72179cd38506478b432de9Chris Lattner} 281