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reapply the patches reverted in r149470 that reenable ConstantDataArray,

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but with a critical fix to the SelectionDAG code that optimizes copies
from strings into immediate stores: the previous code was stopping reading
string data at the first nul.  Address this by adding a new argument to
llvm::getConstantStringInfo, preserving the behavior before the patch.



git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@149800 91177308-0d34-0410-b5e6-96231b3b80d8
This commit is contained in:
Chris Lattner
2012-02-05 02:29:43 +00:00
parent eea723fe02
commit 18c7f80b3e
19 changed files with 276 additions and 539 deletions
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36
include/llvm/Constants.h
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@ -352,17 +352,6 @@ public:
// ConstantArray accessors
static Constant *get(ArrayType *T, ArrayRef<Constant*> V);
/// This method constructs a ConstantArray and initializes it with a text
/// string. The default behavior (AddNull==true) causes a null terminator to
/// be placed at the end of the array. This effectively increases the length
/// of the array by one (you've been warned). However, in some situations
/// this is not desired so if AddNull==false then the string is copied without
/// null termination.
// FIXME Remove this.
static Constant *get(LLVMContext &Context, StringRef Initializer,
bool AddNull = true);
/// Transparently provide more efficient getOperand methods.
DECLARE_TRANSPARENT_OPERAND_ACCESSORS(Constant);
@ -373,31 +362,6 @@ 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;
/// isCString - This method returns true if the array is a string (see
/// @verbatim
/// isString) and it ends in a null byte \0 and does not contains any other
/// @endverbatim
/// 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.
///
std::string getAsString() const;
/// getAsCString - If this array is isCString(), then this method converts the
/// array (without the trailing null byte) to an std::string and returns it.
/// Otherwise, it asserts out.
///
std::string getAsCString() const;
virtual void destroyConstant();
virtual void replaceUsesOfWithOnConstant(Value *From, Value *To, Use *U);