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Add various "string" methods to ConstantDataSequential, which have the

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same semantics as ConstantArray's but much more efficient because they
don't have to return std::string's.  The ConstantArray methods will
eventually be removed.


git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@148792 91177308-0d34-0410-b5e6-96231b3b80d8
This commit is contained in:
Chris Lattner 2012-01-24 09:01:07 +00:00
parent a97a5eabe2
commit 6233907312
2 changed files with 54 additions and 0 deletions
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27
include/llvm/Constants.h
View File

@ -371,6 +371,9 @@ public:
return reinterpret_cast<ArrayType*>(Value::getType());
}
// FIXME: String methods will eventually be removed.
/// isString - This method returns true if the array is an array of i8 and
/// the elements of the array are all ConstantInt's.
bool isString() const;
@ -626,6 +629,30 @@ public:
/// byte.
uint64_t getElementByteSize() const;
/// isString - This method returns true if this is an array of i8.
bool isString() const;
/// isCString - This method returns true if the array "isString", ends with a
/// nul byte, and does not contains any other nul bytes.
bool isCString() const;
/// getAsString - If this array is isString(), then this method returns the
/// array as a StringRef. Otherwise, it asserts out.
///
StringRef getAsString() const;
/// getAsCString - If this array is isCString(), then this method returns the
/// array (without the trailing null byte) as a StringRef. Otherwise, it
/// asserts out.
///
StringRef getAsCString() const {
assert(isCString() && "Isn't a C string");
StringRef Str = getAsString();
return Str.substr(0, Str.size()-1);
}
virtual void destroyConstant();
/// Methods for support type inquiry through isa, cast, and dyn_cast:

27
lib/VMCore/Constants.cpp
View File

@ -2221,7 +2221,34 @@ Constant *ConstantDataSequential::getElementAsConstant(unsigned Elt) const {
return ConstantInt::get(getElementType(), getElementAsInteger(Elt));
}
/// isString - This method returns true if this is an array of i8.
bool ConstantDataSequential::isString() const {
return isa<ArrayType>(getType()) && getElementType()->isIntegerTy(8);
}
/// getAsString - If this array is isString(), then this method returns the
/// array as a StringRef. Otherwise, it asserts out.
///
StringRef ConstantDataSequential::getAsString() const {
assert(isString() && "Not a string");
return StringRef(DataElements, getType()->getNumElements());
}
/// isCString - This method returns true if the array "isString", ends with a
/// nul byte, and does not contains any other nul bytes.
bool ConstantDataSequential::isCString() const {
if (!isString())
return false;
StringRef Str = getAsString();
// The last value must be nul.
if (Str.back() != 0) return false;
// Other elements must be non-nul.
return Str.drop_back().find(0) == StringRef::npos;
}
//===----------------------------------------------------------------------===//