forked from OSchip/llvm-project
254 lines
8.6 KiB
C++
254 lines
8.6 KiB
C++
//===- FileCheck.cpp - Check that File's Contents match what is expected --===//
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//
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// The LLVM Compiler Infrastructure
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//
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// This file is distributed under the University of Illinois Open Source
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// License. See LICENSE.TXT for details.
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//
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//===----------------------------------------------------------------------===//
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//
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// FileCheck does a line-by line check of a file that validates whether it
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// contains the expected content. This is useful for regression tests etc.
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//
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// This program exits with an error status of 2 on error, exit status of 0 if
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// the file matched the expected contents, and exit status of 1 if it did not
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// contain the expected contents.
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//
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//===----------------------------------------------------------------------===//
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#include "llvm/Support/CommandLine.h"
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#include "llvm/Support/MemoryBuffer.h"
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#include "llvm/Support/PrettyStackTrace.h"
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#include "llvm/Support/SourceMgr.h"
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#include "llvm/Support/raw_ostream.h"
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#include "llvm/System/Signals.h"
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using namespace llvm;
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static cl::opt<std::string>
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CheckFilename(cl::Positional, cl::desc("<check-file>"), cl::Required);
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static cl::opt<std::string>
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InputFilename("input-file", cl::desc("File to check (defaults to stdin)"),
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cl::init("-"), cl::value_desc("filename"));
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static cl::opt<std::string>
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CheckPrefix("check-prefix", cl::init("CHECK"),
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cl::desc("Prefix to use from check file (defaults to 'CHECK')"));
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static cl::opt<bool>
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NoCanonicalizeWhiteSpace("strict-whitespace",
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cl::desc("Do not treat all horizontal whitespace as equivalent"));
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/// FindStringInBuffer - This is basically just a strstr wrapper that differs in
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/// two ways: first it handles 'nul' characters in memory buffers, second, it
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/// returns the end of the memory buffer on match failure.
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static const char *FindStringInBuffer(const char *Str, const char *CurPtr,
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const MemoryBuffer &MB) {
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// Check to see if we have a match. If so, just return it.
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if (const char *Res = strstr(CurPtr, Str))
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return Res;
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// If not, check to make sure we didn't just find an embedded nul in the
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// memory buffer.
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const char *Ptr = CurPtr + strlen(CurPtr);
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// If we really reached the end of the file, return it.
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if (Ptr == MB.getBufferEnd())
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return Ptr;
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// Otherwise, just skip this section of the file, including the nul.
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return FindStringInBuffer(Str, Ptr+1, MB);
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}
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/// ReadCheckFile - Read the check file, which specifies the sequence of
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/// expected strings. The strings are added to the CheckStrings vector.
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static bool ReadCheckFile(SourceMgr &SM,
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std::vector<std::pair<std::string, SMLoc> >
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&CheckStrings) {
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// Open the check file, and tell SourceMgr about it.
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std::string ErrorStr;
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MemoryBuffer *F =
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MemoryBuffer::getFileOrSTDIN(CheckFilename.c_str(), &ErrorStr);
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if (F == 0) {
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errs() << "Could not open check file '" << CheckFilename << "': "
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<< ErrorStr << '\n';
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return true;
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}
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SM.AddNewSourceBuffer(F, SMLoc());
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// Find all instances of CheckPrefix followed by : in the file. The
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// MemoryBuffer is guaranteed to be nul terminated, but may have nul's
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// embedded into it. We don't support check strings with embedded nuls.
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std::string Prefix = CheckPrefix + ":";
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const char *CurPtr = F->getBufferStart(), *BufferEnd = F->getBufferEnd();
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while (1) {
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// See if Prefix occurs in the memory buffer.
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const char *Ptr = FindStringInBuffer(Prefix.c_str(), CurPtr, *F);
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// If we didn't find a match, we're done.
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if (Ptr == BufferEnd)
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break;
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// Okay, we found the prefix, yay. Remember the rest of the line, but
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// ignore leading and trailing whitespace.
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Ptr += Prefix.size();
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while (*Ptr == ' ' || *Ptr == '\t')
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++Ptr;
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// Scan ahead to the end of line.
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CurPtr = Ptr;
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while (CurPtr != BufferEnd && *CurPtr != '\n' && *CurPtr != '\r')
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++CurPtr;
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// Ignore trailing whitespace.
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while (CurPtr[-1] == ' ' || CurPtr[-1] == '\t')
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--CurPtr;
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// Check that there is something on the line.
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if (Ptr >= CurPtr) {
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SM.PrintMessage(SMLoc::getFromPointer(CurPtr),
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"found empty check string with prefix '"+Prefix+"'",
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"error");
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return true;
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}
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// Okay, add the string we captured to the output vector and move on.
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CheckStrings.push_back(std::make_pair(std::string(Ptr, CurPtr),
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SMLoc::getFromPointer(Ptr)));
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}
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if (CheckStrings.empty()) {
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errs() << "error: no check strings found with prefix '" << Prefix << "'\n";
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return true;
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}
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return false;
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}
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// CanonicalizeCheckStrings - Replace all sequences of horizontal whitespace in
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// the check strings with a single space.
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static void CanonicalizeCheckStrings(std::vector<std::pair<std::string, SMLoc> >
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&CheckStrings) {
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for (unsigned i = 0, e = CheckStrings.size(); i != e; ++i) {
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std::string &Str = CheckStrings[i].first;
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for (unsigned C = 0; C != Str.size(); ++C) {
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// If C is not a horizontal whitespace, skip it.
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if (Str[C] != ' ' && Str[C] != '\t')
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continue;
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// Replace the character with space, then remove any other space
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// characters after it.
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Str[C] = ' ';
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while (C+1 != Str.size() &&
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(Str[C+1] == ' ' || Str[C+1] == '\t'))
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Str.erase(Str.begin()+C+1);
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}
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}
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}
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/// CanonicalizeInputFile - Remove duplicate horizontal space from the specified
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/// memory buffer, free it, and return a new one.
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static MemoryBuffer *CanonicalizeInputFile(MemoryBuffer *MB) {
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SmallVector<char, 16> NewFile;
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NewFile.reserve(MB->getBufferSize());
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for (const char *Ptr = MB->getBufferStart(), *End = MB->getBufferEnd();
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Ptr != End; ++Ptr) {
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// If C is not a horizontal whitespace, skip it.
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if (*Ptr != ' ' && *Ptr != '\t') {
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NewFile.push_back(*Ptr);
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continue;
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}
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// Otherwise, add one space and advance over neighboring space.
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NewFile.push_back(' ');
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while (Ptr+1 != End &&
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(Ptr[1] == ' ' || Ptr[1] == '\t'))
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++Ptr;
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}
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// Free the old buffer and return a new one.
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MemoryBuffer *MB2 =
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MemoryBuffer::getMemBufferCopy(NewFile.data(),
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NewFile.data() + NewFile.size(),
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MB->getBufferIdentifier());
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delete MB;
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return MB2;
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}
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int main(int argc, char **argv) {
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sys::PrintStackTraceOnErrorSignal();
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PrettyStackTraceProgram X(argc, argv);
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cl::ParseCommandLineOptions(argc, argv);
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SourceMgr SM;
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// Read the expected strings from the check file.
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std::vector<std::pair<std::string, SMLoc> > CheckStrings;
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if (ReadCheckFile(SM, CheckStrings))
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return 2;
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// Remove duplicate spaces in the check strings if requested.
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if (!NoCanonicalizeWhiteSpace)
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CanonicalizeCheckStrings(CheckStrings);
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// Open the file to check and add it to SourceMgr.
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std::string ErrorStr;
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MemoryBuffer *F =
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MemoryBuffer::getFileOrSTDIN(InputFilename.c_str(), &ErrorStr);
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if (F == 0) {
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errs() << "Could not open input file '" << InputFilename << "': "
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<< ErrorStr << '\n';
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return true;
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}
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// Remove duplicate spaces in the input file if requested.
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if (!NoCanonicalizeWhiteSpace)
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F = CanonicalizeInputFile(F);
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SM.AddNewSourceBuffer(F, SMLoc());
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// Check that we have all of the expected strings, in order, in the input
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// file.
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const char *CurPtr = F->getBufferStart(), *BufferEnd = F->getBufferEnd();
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for (unsigned StrNo = 0, e = CheckStrings.size(); StrNo != e; ++StrNo) {
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const std::pair<std::string, SMLoc> &CheckStr = CheckStrings[StrNo];
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// Find StrNo in the file.
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const char *Ptr = FindStringInBuffer(CheckStr.first.c_str(), CurPtr, *F);
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// If we found a match, we're done, move on.
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if (Ptr != BufferEnd) {
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CurPtr = Ptr + CheckStr.first.size();
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continue;
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}
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// Otherwise, we have an error, emit an error message.
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SM.PrintMessage(CheckStr.second, "expected string not found in input",
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"error");
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// Print the "scanning from here" line. If the current position is at the
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// end of a line, advance to the start of the next line.
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const char *Scan = CurPtr;
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while (Scan != BufferEnd &&
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(*Scan == ' ' || *Scan == '\t'))
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++Scan;
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if (*Scan == '\n' || *Scan == '\r')
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CurPtr = Scan+1;
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SM.PrintMessage(SMLoc::getFromPointer(CurPtr), "scanning from here",
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"note");
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return 1;
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}
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return 0;
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}
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