+ isClobber // '~x'
+ };
+
+ struct ConstraintInfo {
+ /// Type - The basic type of the constraint: input/output/clobber
+ ///
+ ConstraintPrefix Type;
+
+ /// isEarlyClobber - "&": output operand writes result before inputs are all
+ /// read. This is only ever set for an output operand.
+ bool isEarlyClobber;
+
+ /// MatchingInput - If this is not -1, this is an output constraint where an
+ /// input constraint is required to match it (e.g. "0"). The value is the
+ /// constraint number that matches this one (for example, if this is
+ /// constraint #0 and constraint #4 has the value "0", this will be 4).
+ signed char MatchingInput;
+
+ /// hasMatchingInput - Return true if this is an output constraint that has
+ /// a matching input constraint.
+ bool hasMatchingInput() const { return MatchingInput != -1; }
+
+ /// isCommutative - This is set to true for a constraint that is commutative
+ /// with the next operand.
+ bool isCommutative;
+
+ /// isIndirect - True if this operand is an indirect operand. This means
+ /// that the address of the source or destination is present in the call
+ /// instruction, instead of it being returned or passed in explicitly. This
+ /// is represented with a '*' in the asm string.
+ bool isIndirect;
+
+ /// Code - The constraint code, either the register name (in braces) or the
+ /// constraint letter/number.
+ std::vector<std::string> Codes;
+
+ /// Parse - Analyze the specified string (e.g. "=*&{eax}") and fill in the
+ /// fields in this structure. If the constraint string is not understood,
+ /// return true, otherwise return false.
+ bool Parse(StringRef Str,
+ std::vector<InlineAsm::ConstraintInfo> &ConstraintsSoFar);