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rewrite FileCheck in terms of StringRef instead of manual pointer pairs.

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git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@82407 91177308-0d34-0410-b5e6-96231b3b80d8
This commit is contained in:
Chris Lattner 2009-09-20 22:11:44 +00:00
parent 386251341f
commit 96077036f0
1 changed files with 37 additions and 68 deletions
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105
utils/FileCheck/FileCheck.cpp
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@ -56,35 +56,6 @@ struct CheckString {
};
/// FindFixedStringInBuffer - This works like strstr, except for two things:
/// 1) it handles 'nul' characters in memory buffers. 2) it returns the end of
/// the memory buffer on match failure instead of null.
static const char *FindFixedStringInBuffer(StringRef Str, const char *CurPtr,
const MemoryBuffer &MB) {
assert(!Str.empty() && "Can't find an empty string");
const char *BufEnd = MB.getBufferEnd();
while (1) {
// Scan for the first character in the match string.
CurPtr = (char*)memchr(CurPtr, Str[0], BufEnd-CurPtr);
// If we didn't find the first character of the string, then we failed to
// match.
if (CurPtr == 0) return BufEnd;
// If the match string is one character, then we win.
if (Str.size() == 1) return CurPtr;
// Otherwise, verify that the rest of the string matches.
if (Str.size() <= unsigned(BufEnd-CurPtr) &&
memcmp(CurPtr+1, Str.data()+1, Str.size()-1) == 0)
return CurPtr;
// If not, advance past this character and try again.
++CurPtr;
}
}
/// ReadCheckFile - Read the check file, which specifies the sequence of
/// expected strings. The strings are added to the CheckStrings vector.
static bool ReadCheckFile(SourceMgr &SM,
@ -101,52 +72,51 @@ static bool ReadCheckFile(SourceMgr &SM,
SM.AddNewSourceBuffer(F, SMLoc());
// Find all instances of CheckPrefix followed by : in the file.
const char *CurPtr = F->getBufferStart(), *BufferEnd = F->getBufferEnd();
StringRef Buffer = F->getBuffer();
while (1) {
// See if Prefix occurs in the memory buffer.
const char *Ptr = FindFixedStringInBuffer(CheckPrefix, CurPtr, *F);
Buffer = Buffer.substr(Buffer.find(CheckPrefix));
// If we didn't find a match, we're done.
if (Ptr == BufferEnd)
if (Buffer.empty())
break;
const char *CheckPrefixStart = Ptr;
const char *CheckPrefixStart = Buffer.data();
// When we find a check prefix, keep track of whether we find CHECK: or
// CHECK-NEXT:
bool IsCheckNext;
// Verify that the : is present after the prefix.
if (Ptr[CheckPrefix.size()] == ':') {
Ptr += CheckPrefix.size()+1;
if (Buffer[CheckPrefix.size()] == ':') {
Buffer = Buffer.substr(CheckPrefix.size()+1);
IsCheckNext = false;
} else if (BufferEnd-Ptr > 6 &&
memcmp(Ptr+CheckPrefix.size(), "-NEXT:", 6) == 0) {
Ptr += CheckPrefix.size()+7;
} else if (Buffer.size() > CheckPrefix.size()+6 &&
memcmp(Buffer.data()+CheckPrefix.size(), "-NEXT:", 6) == 0) {
Buffer = Buffer.substr(CheckPrefix.size()+7);
IsCheckNext = true;
} else {
CurPtr = Ptr+1;
Buffer = Buffer.substr(1);
continue;
}
// Okay, we found the prefix, yay. Remember the rest of the line, but
// ignore leading and trailing whitespace.
while (*Ptr == ' ' || *Ptr == '\t')
++Ptr;
while (!Buffer.empty() && (Buffer[0] == ' ' || Buffer[0] == '\t'))
Buffer = Buffer.substr(1);
// Scan ahead to the end of line.
CurPtr = Ptr;
while (CurPtr != BufferEnd && *CurPtr != '\n' && *CurPtr != '\r')
++CurPtr;
size_t EOL = Buffer.find_first_of("\n\r");
if (EOL == StringRef::npos) EOL = Buffer.size();
// Ignore trailing whitespace.
while (CurPtr[-1] == ' ' || CurPtr[-1] == '\t')
--CurPtr;
while (EOL && (Buffer[EOL-1] == ' ' || Buffer[EOL-1] == '\t'))
--EOL;
// Check that there is something on the line.
if (Ptr >= CurPtr) {
SM.PrintMessage(SMLoc::getFromPointer(CurPtr),
if (EOL == 0) {
SM.PrintMessage(SMLoc::getFromPointer(Buffer.data()),
"found empty check string with prefix '"+CheckPrefix+":'",
"error");
return true;
@ -161,9 +131,12 @@ static bool ReadCheckFile(SourceMgr &SM,
}
// Okay, add the string we captured to the output vector and move on.
CheckStrings.push_back(CheckString(std::string(Ptr, CurPtr),
SMLoc::getFromPointer(Ptr),
CheckStrings.push_back(CheckString(std::string(Buffer.data(),
Buffer.data()+EOL),
SMLoc::getFromPointer(Buffer.data()),
IsCheckNext));
Buffer = Buffer.substr(EOL);
}
if (CheckStrings.empty()) {
@ -230,22 +203,16 @@ static MemoryBuffer *CanonicalizeInputFile(MemoryBuffer *MB) {
static void PrintCheckFailed(const SourceMgr &SM, const CheckString &CheckStr,
const char *CurPtr, const char *BufferEnd) {
StringRef Buffer) {
// Otherwise, we have an error, emit an error message.
SM.PrintMessage(CheckStr.Loc, "expected string not found in input",
"error");
// Print the "scanning from here" line. If the current position is at the
// end of a line, advance to the start of the next line.
const char *Scan = CurPtr;
while (Scan != BufferEnd &&
(*Scan == ' ' || *Scan == '\t'))
++Scan;
if (*Scan == '\n' || *Scan == '\r')
CurPtr = Scan+1;
Buffer = Buffer.substr(Buffer.find_first_not_of(" \t\n\r"));
SM.PrintMessage(SMLoc::getFromPointer(CurPtr), "scanning from here",
SM.PrintMessage(SMLoc::getFromPointer(Buffer.data()), "scanning from here",
"note");
}
@ -302,18 +269,20 @@ int main(int argc, char **argv) {
// Check that we have all of the expected strings, in order, in the input
// file.
const char *CurPtr = F->getBufferStart(), *BufferEnd = F->getBufferEnd();
StringRef Buffer = F->getBuffer();
const char *LastMatch = 0;
for (unsigned StrNo = 0, e = CheckStrings.size(); StrNo != e; ++StrNo) {
const CheckString &CheckStr = CheckStrings[StrNo];
StringRef SearchFrom = Buffer;
// Find StrNo in the file.
const char *Ptr = FindFixedStringInBuffer(CheckStr.Str, CurPtr, *F);
Buffer = Buffer.substr(Buffer.find(CheckStr.Str));
// If we didn't find a match, reject the input.
if (Ptr == BufferEnd) {
PrintCheckFailed(SM, CheckStr, CurPtr, BufferEnd);
if (Buffer.empty()) {
PrintCheckFailed(SM, CheckStr, SearchFrom);
return 1;
}
@ -323,12 +292,12 @@ int main(int argc, char **argv) {
// Count the number of newlines between the previous match and this one.
assert(LastMatch && "CHECK-NEXT can't be the first check in a file");
unsigned NumNewLines = CountNumNewlinesBetween(LastMatch, Ptr);
unsigned NumNewLines = CountNumNewlinesBetween(LastMatch, Buffer.data());
if (NumNewLines == 0) {
SM.PrintMessage(CheckStr.Loc,
CheckPrefix+"-NEXT: is on the same line as previous match",
"error");
SM.PrintMessage(SMLoc::getFromPointer(Ptr),
SM.PrintMessage(SMLoc::getFromPointer(Buffer.data()),
"'next' match was here", "note");
SM.PrintMessage(SMLoc::getFromPointer(LastMatch),
"previous match was here", "note");
@ -340,7 +309,7 @@ int main(int argc, char **argv) {
CheckPrefix+
"-NEXT: is not on the line after the previous match",
"error");
SM.PrintMessage(SMLoc::getFromPointer(Ptr),
SM.PrintMessage(SMLoc::getFromPointer(Buffer.data()),
"'next' match was here", "note");
SM.PrintMessage(SMLoc::getFromPointer(LastMatch),
"previous match was here", "note");
@ -350,8 +319,8 @@ int main(int argc, char **argv) {
// Otherwise, everything is good. Remember this as the last match and move
// on to the next one.
LastMatch = Ptr;
CurPtr = Ptr + CheckStr.Str.size();
LastMatch = Buffer.data();
Buffer = Buffer.substr(CheckStr.Str.size());
}
return 0;