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CHECK-NEXT is on. git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@79164 91177308-0d34-0410-b5e6-96231b3b80d8
359 lines
12 KiB
C++
359 lines
12 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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/// CheckString - This is a check that we found in the input file.
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struct CheckString {
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/// Str - The string to match.
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std::string Str;
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/// Loc - The location in the match file that the check string was specified.
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SMLoc Loc;
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/// IsCheckNext - This is true if this is a CHECK-NEXT: directive (as opposed
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/// to a CHECK: directive.
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bool IsCheckNext;
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CheckString(const std::string &S, SMLoc L, bool isCheckNext)
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: Str(S), Loc(L), IsCheckNext(isCheckNext) {}
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};
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/// FindFixedStringInBuffer - This works like strstr, except for two things:
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/// 1) it handles 'nul' characters in memory buffers. 2) it returns the end of
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/// the memory buffer on match failure instead of null.
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static const char *FindFixedStringInBuffer(StringRef Str, const char *CurPtr,
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const MemoryBuffer &MB) {
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assert(!Str.empty() && "Can't find an empty string");
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const char *BufEnd = MB.getBufferEnd();
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while (1) {
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// Scan for the first character in the match string.
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CurPtr = (char*)memchr(CurPtr, Str[0], BufEnd-CurPtr);
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// If we didn't find the first character of the string, then we failed to
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// match.
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if (CurPtr == 0) return BufEnd;
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// If the match string is one character, then we win.
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if (Str.size() == 1) return CurPtr;
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// Otherwise, verify that the rest of the string matches.
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if (Str.size() <= unsigned(BufEnd-CurPtr) &&
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memcmp(CurPtr+1, Str.data()+1, Str.size()-1) == 0)
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return CurPtr;
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// If not, advance past this character and try again.
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++CurPtr;
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}
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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<CheckString> &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.
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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 = FindFixedStringInBuffer(CheckPrefix, 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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const char *CheckPrefixStart = Ptr;
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// When we find a check prefix, keep track of whether we find CHECK: or
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// CHECK-NEXT:
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bool IsCheckNext;
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// Verify that the : is present after the prefix.
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if (Ptr[CheckPrefix.size()] == ':') {
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Ptr += CheckPrefix.size()+1;
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IsCheckNext = false;
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} else if (BufferEnd-Ptr > 6 &&
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memcmp(Ptr+CheckPrefix.size(), "-NEXT:", 6) == 0) {
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Ptr += CheckPrefix.size()+7;
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IsCheckNext = true;
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} else {
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CurPtr = Ptr+1;
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continue;
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}
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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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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 '"+CheckPrefix+":'",
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"error");
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return true;
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}
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// Verify that CHECK-NEXT lines have at least one CHECK line before them.
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if (IsCheckNext && CheckStrings.empty()) {
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SM.PrintMessage(SMLoc::getFromPointer(CheckPrefixStart),
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"found '"+CheckPrefix+"-NEXT:' without previous '"+
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CheckPrefix+ ": line", "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(CheckString(std::string(Ptr, CurPtr),
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SMLoc::getFromPointer(Ptr),
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IsCheckNext));
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}
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if (CheckStrings.empty()) {
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errs() << "error: no check strings found with prefix '" << CheckPrefix
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<< ":'\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<CheckString> &CheckStrings) {
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for (unsigned i = 0, e = CheckStrings.size(); i != e; ++i) {
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std::string &Str = CheckStrings[i].Str;
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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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static void PrintCheckFailed(const SourceMgr &SM, const CheckString &CheckStr,
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const char *CurPtr, const char *BufferEnd) {
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// Otherwise, we have an error, emit an error message.
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SM.PrintMessage(CheckStr.Loc, "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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}
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static unsigned CountNumNewlinesBetween(const char *Start, const char *End) {
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unsigned NumNewLines = 0;
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for (; Start != End; ++Start) {
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// Scan for newline.
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if (Start[0] != '\n' && Start[0] != '\r')
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continue;
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++NumNewLines;
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// Handle \n\r and \r\n as a single newline.
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if (Start+1 != End &&
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(Start[0] == '\n' || Start[0] == '\r') &&
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(Start[0] != Start[1]))
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++Start;
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}
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return NumNewLines;
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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<CheckString> 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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const char *LastMatch = 0;
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for (unsigned StrNo = 0, e = CheckStrings.size(); StrNo != e; ++StrNo) {
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const CheckString &CheckStr = CheckStrings[StrNo];
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// Find StrNo in the file.
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const char *Ptr = FindFixedStringInBuffer(CheckStr.Str, CurPtr, *F);
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// If we didn't find a match, reject the input.
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if (Ptr == BufferEnd) {
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PrintCheckFailed(SM, CheckStr, CurPtr, BufferEnd);
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return 1;
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}
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// If this check is a "CHECK-NEXT", verify that the previous match was on
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// the previous line (i.e. that there is one newline between them).
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if (CheckStr.IsCheckNext) {
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// Count the number of newlines between the previous match and this one.
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assert(LastMatch && "CHECK-NEXT can't be the first check in a file");
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unsigned NumNewLines = CountNumNewlinesBetween(LastMatch, Ptr);
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if (NumNewLines == 0) {
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SM.PrintMessage(CheckStr.Loc,
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CheckPrefix+"-NEXT: is on the same line as previous match",
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"error");
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SM.PrintMessage(SMLoc::getFromPointer(Ptr),
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"'next' match was here", "note");
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SM.PrintMessage(SMLoc::getFromPointer(LastMatch),
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"previous match was here", "note");
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return 1;
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}
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if (NumNewLines != 1) {
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SM.PrintMessage(CheckStr.Loc,
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CheckPrefix+
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"-NEXT: is not on the line after the previous match",
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"error");
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SM.PrintMessage(SMLoc::getFromPointer(Ptr),
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"'next' match was here", "note");
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SM.PrintMessage(SMLoc::getFromPointer(LastMatch),
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"previous match was here", "note");
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return 1;
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}
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}
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// Otherwise, everything is good. Remember this as the last match and move
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// on to the next one.
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LastMatch = Ptr;
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CurPtr = Ptr + CheckStr.Str.size();
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}
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return 0;
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}
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