X-Git-Url: http://demsky.eecs.uci.edu/git/?a=blobdiff_plain;f=utils%2FFileCheck%2FFileCheck.cpp;h=9606e64d6f8937482b60a18650e74a6f885ac5b6;hb=12af22e8cc217827cf4f118b0f5e4ebbda9925ae;hp=a1243774fee36f2e47eaa4595c94118e62e18c00;hpb=9583b2c3dc4743f318e7188aeabca661d2a06673;p=oota-llvm.git

diff --git a/utils/FileCheck/FileCheck.cpp b/utils/FileCheck/FileCheck.cpp
index a1243774fee..9606e64d6f8 100644
--- a/utils/FileCheck/FileCheck.cpp
+++ b/utils/FileCheck/FileCheck.cpp
@@ -27,11 +27,11 @@
 #include "llvm/Support/Signals.h"
 #include "llvm/Support/SourceMgr.h"
 #include "llvm/Support/raw_ostream.h"
-#include "llvm/Support/system_error.h"
 #include <algorithm>
 #include <cctype>
 #include <map>
 #include <string>
+#include <system_error>
 #include <vector>
 using namespace llvm;
 
@@ -50,6 +50,18 @@ static cl::opt<bool>
 NoCanonicalizeWhiteSpace("strict-whitespace",
               cl::desc("Do not treat all horizontal whitespace as equivalent"));
 
+static cl::list<std::string> ImplicitCheckNot(
+    "implicit-check-not",
+    cl::desc("Add an implicit negative check with this pattern to every\n"
+             "positive check. This can be used to ensure that no instances of\n"
+             "this pattern occur which are not matched by a positive pattern"),
+    cl::value_desc("pattern"));
+
+static cl::opt<bool> AllowEmptyInput(
+    "allow-empty", cl::init(false),
+    cl::desc("Allow the input file to be empty. This is useful when making\n"
+             "checks that some error message does not occur, for example."));
+
 typedef cl::list<std::string>::const_iterator prefix_iterator;
 
 //===----------------------------------------------------------------------===//
@@ -624,8 +636,9 @@ struct CheckString {
 ///
 /// \param PreserveHorizontal Don't squash consecutive horizontal whitespace
 /// characters to a single space.
-static MemoryBuffer *CanonicalizeInputFile(MemoryBuffer *MB,
-                                           bool PreserveHorizontal) {
+static std::unique_ptr<MemoryBuffer>
+CanonicalizeInputFile(std::unique_ptr<MemoryBuffer> MB,
+                      bool PreserveHorizontal) {
   SmallString<128> NewFile;
   NewFile.reserve(MB->getBufferSize());
 
@@ -650,12 +663,8 @@ static MemoryBuffer *CanonicalizeInputFile(MemoryBuffer *MB,
       ++Ptr;
   }
 
-  // Free the old buffer and return a new one.
-  MemoryBuffer *MB2 =
-    MemoryBuffer::getMemBufferCopy(NewFile.str(), MB->getBufferIdentifier());
-
-  delete MB;
-  return MB2;
+  return std::unique_ptr<MemoryBuffer>(
+      MemoryBuffer::getMemBufferCopy(NewFile.str(), MB->getBufferIdentifier()));
 }
 
 static bool IsPartOfWord(char c) {
@@ -820,24 +829,44 @@ static StringRef FindFirstMatchingPrefix(StringRef &Buffer,
 /// Returns true in case of an error, false otherwise.
 static bool ReadCheckFile(SourceMgr &SM,
                           std::vector<CheckString> &CheckStrings) {
-  std::unique_ptr<MemoryBuffer> File;
-  if (error_code ec =
-        MemoryBuffer::getFileOrSTDIN(CheckFilename, File)) {
-    errs() << "Could not open check file '" << CheckFilename << "': "
-           << ec.message() << '\n';
+  ErrorOr<std::unique_ptr<MemoryBuffer>> FileOrErr =
+      MemoryBuffer::getFileOrSTDIN(CheckFilename);
+  if (std::error_code EC = FileOrErr.getError()) {
+    errs() << "Could not open check file '" << CheckFilename
+           << "': " << EC.message() << '\n';
     return true;
   }
 
   // If we want to canonicalize whitespace, strip excess whitespace from the
   // buffer containing the CHECK lines. Remove DOS style line endings.
-  MemoryBuffer *F =
-    CanonicalizeInputFile(File.release(), NoCanonicalizeWhiteSpace);
-
-  SM.AddNewSourceBuffer(F, SMLoc());
+  std::unique_ptr<MemoryBuffer> F = CanonicalizeInputFile(
+      std::move(FileOrErr.get()), NoCanonicalizeWhiteSpace);
 
   // Find all instances of CheckPrefix followed by : in the file.
   StringRef Buffer = F->getBuffer();
-  std::vector<Pattern> DagNotMatches;
+
+  SM.AddNewSourceBuffer(std::move(F), SMLoc());
+
+  std::vector<Pattern> ImplicitNegativeChecks;
+  for (const auto &PatternString : ImplicitCheckNot) {
+    // Create a buffer with fake command line content in order to display the
+    // command line option responsible for the specific implicit CHECK-NOT.
+    std::string Prefix = std::string("-") + ImplicitCheckNot.ArgStr + "='";
+    std::string Suffix = "'";
+    std::unique_ptr<MemoryBuffer> CmdLine = MemoryBuffer::getMemBufferCopy(
+        Prefix + PatternString + Suffix, "command line");
+
+    StringRef PatternInBuffer =
+        CmdLine->getBuffer().substr(Prefix.size(), PatternString.size());
+    SM.AddNewSourceBuffer(std::move(CmdLine), SMLoc());
+
+    ImplicitNegativeChecks.push_back(Pattern(Check::CheckNot));
+    ImplicitNegativeChecks.back().ParsePattern(PatternInBuffer,
+                                               "IMPLICIT-CHECK", SM, 0);
+  }
+
+
+  std::vector<Pattern> DagNotMatches = ImplicitNegativeChecks;
 
   // LineNumber keeps track of the line on which CheckPrefix instances are
   // found.
@@ -910,6 +939,7 @@ static bool ReadCheckFile(SourceMgr &SM,
                                        PatternLoc,
                                        CheckTy));
     std::swap(DagNotMatches, CheckStrings.back().DagNotStrings);
+    DagNotMatches = ImplicitNegativeChecks;
   }
 
   // Add an EOF pattern for any trailing CHECK-DAG/-NOTs, and use the first
@@ -1043,7 +1073,7 @@ bool CheckString::CheckNext(const SourceMgr &SM, StringRef Buffer) const {
              SMLoc::getFromPointer(Buffer.data())))->getBufferStart() &&
          "CHECK-NEXT can't be the first check in a file");
 
-  const char *FirstNewLine = 0;
+  const char *FirstNewLine = nullptr;
   unsigned NumNewLines = CountNumNewlinesBetween(Buffer, FirstNewLine);
 
   if (NumNewLines == 0) {
@@ -1185,6 +1215,10 @@ static bool ValidateCheckPrefixes() {
        I != E; ++I) {
     StringRef Prefix(*I);
 
+    // Reject empty prefixes.
+    if (Prefix == "")
+      return false;
+
     if (!PrefixSet.insert(Prefix))
       return false;
 
@@ -1224,33 +1258,34 @@ int main(int argc, char **argv) {
     return 2;
 
   // Open the file to check and add it to SourceMgr.
-  std::unique_ptr<MemoryBuffer> File;
-  if (error_code ec =
-        MemoryBuffer::getFileOrSTDIN(InputFilename, File)) {
-    errs() << "Could not open input file '" << InputFilename << "': "
-           << ec.message() << '\n';
+  ErrorOr<std::unique_ptr<MemoryBuffer>> FileOrErr =
+      MemoryBuffer::getFileOrSTDIN(InputFilename);
+  if (std::error_code EC = FileOrErr.getError()) {
+    errs() << "Could not open input file '" << InputFilename
+           << "': " << EC.message() << '\n';
     return 2;
   }
+  std::unique_ptr<MemoryBuffer> &File = FileOrErr.get();
 
-  if (File->getBufferSize() == 0) {
+  if (File->getBufferSize() == 0 && !AllowEmptyInput) {
     errs() << "FileCheck error: '" << InputFilename << "' is empty.\n";
     return 2;
   }
 
   // Remove duplicate spaces in the input file if requested.
   // Remove DOS style line endings.
-  MemoryBuffer *F =
-    CanonicalizeInputFile(File.release(), NoCanonicalizeWhiteSpace);
-
-  SM.AddNewSourceBuffer(F, SMLoc());
-
-  /// VariableTable - This holds all the current filecheck variables.
-  StringMap<StringRef> VariableTable;
+  std::unique_ptr<MemoryBuffer> F =
+      CanonicalizeInputFile(std::move(File), NoCanonicalizeWhiteSpace);
 
   // Check that we have all of the expected strings, in order, in the input
   // file.
   StringRef Buffer = F->getBuffer();
 
+  SM.AddNewSourceBuffer(std::move(F), SMLoc());
+
+  /// VariableTable - This holds all the current filecheck variables.
+  StringMap<StringRef> VariableTable;
+
   bool hasError = false;
 
   unsigned i = 0, j = 0, e = CheckStrings.size();