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Add isCString() - returns true if a ConstantArray is a CString.

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llvm-svn: 31201
This commit is contained in:
Evan Cheng 2006-10-26 19:15:05 +00:00
parent 53cc483549
commit 9d0bfecda6
2 changed files with 18 additions and 0 deletions
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5
include/llvm/Constants.h
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@ -334,6 +334,11 @@ public:
/// ubyte, and if the elements of the array are all ConstantInt's.
bool isString() const;
/// isCString - This method returns true if the array is a string (see
/// isString) and it ends in a null byte \0 and does not contains any other
/// null bytes except its terminator.
bool isCString() const;
/// getAsString - If this array is isString(), then this method converts the
/// array to an std::string and returns it. Otherwise, it asserts out.
///

13
lib/VMCore/Constants.cpp
View File

@ -1073,6 +1073,19 @@ bool ConstantArray::isString() const {
return true;
}
/// isCString - This method returns true if the array is a string (see
/// isString) and it ends in a null byte \0 and does not contains any other
/// null bytes except its terminator.
bool ConstantArray::isCString() const {
if (!isString()) return false;
// This is safe because a ConstantArray cannot be a zero array.
for (unsigned i = 0, e = getNumOperands()-1; i != e; ++i)
if (cast<ConstantInt>(getOperand(i))->getZExtValue() == 0)
return false;
return true;
}
// getAsString - If the sub-element type of this array is either sbyte or ubyte,
// then this method converts the array to an std::string and returns it.
// Otherwise, it asserts out.