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discussion of this change. Boy are my fingers tired. ;-) git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@45411 91177308-0d34-0410-b5e6-96231b3b80d8
286 lines
12 KiB
C++
286 lines
12 KiB
C++
//===-- llvm/ParameterAttributes.h - Container for ParamAttrs ---*- C++ -*-===//
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//
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// The LLVM Compiler Infrastructure
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//
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// This file is distributed under the University of Illinois Open Source
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// License. See LICENSE.TXT for details.
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//
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//===----------------------------------------------------------------------===//
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//
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// This file contains the types necessary to represent the parameter attributes
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// associated with functions and their calls.
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//
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// The implementations of these classes live in lib/VMCore/Function.cpp.
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//
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//===----------------------------------------------------------------------===//
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#ifndef LLVM_PARAMETER_ATTRIBUTES_H
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#define LLVM_PARAMETER_ATTRIBUTES_H
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#include "llvm/ADT/SmallVector.h"
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#include "llvm/ADT/FoldingSet.h"
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namespace llvm {
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namespace ParamAttr {
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/// Function parameters and results can have attributes to indicate how they
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/// should be treated by optimizations and code generation. This enumeration
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/// lists the attributes that can be associated with parameters or function
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/// results.
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/// @brief Function parameter attributes.
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enum Attributes {
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None = 0, ///< No attributes have been set
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ZExt = 1 << 0, ///< Zero extended before/after call
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SExt = 1 << 1, ///< Sign extended before/after call
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NoReturn = 1 << 2, ///< Mark the function as not returning
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InReg = 1 << 3, ///< Force argument to be passed in register
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StructRet = 1 << 4, ///< Hidden pointer to structure to return
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NoUnwind = 1 << 5, ///< Function doesn't unwind stack
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NoAlias = 1 << 6, ///< Considered to not alias after call
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ByVal = 1 << 7, ///< Pass structure by value
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Nest = 1 << 8, ///< Nested function static chain
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ReadNone = 1 << 9, ///< Function does not access memory
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ReadOnly = 1 << 10 ///< Function only reads from memory
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};
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/// These attributes can safely be dropped from a function or a function call:
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/// doing so may reduce the number of optimizations performed, but it will not
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/// change a correct program into an incorrect one.
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/// @brief Attributes that do not change the calling convention.
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const uint16_t Informative = NoReturn | NoUnwind | NoAlias |
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ReadNone | ReadOnly;
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/// @brief Attributes that only apply to function parameters.
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const uint16_t ParameterOnly = ByVal | InReg | Nest | StructRet;
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/// @brief Attributes that only apply to function return values.
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const uint16_t ReturnOnly = NoReturn | NoUnwind | ReadNone | ReadOnly;
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/// @brief Attributes that only apply to integers.
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const uint16_t IntegerTypeOnly = SExt | ZExt;
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/// @brief Attributes that only apply to pointers.
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const uint16_t PointerTypeOnly = ByVal | Nest | NoAlias | StructRet;
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/// @brief Attributes that do not apply to void type function return values.
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const uint16_t VoidTypeIncompatible = IntegerTypeOnly | PointerTypeOnly |
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ParameterOnly;
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/// @brief Attributes that are mutually incompatible.
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const uint16_t MutuallyIncompatible[3] = {
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ByVal | InReg | Nest | StructRet,
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ZExt | SExt,
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ReadNone | ReadOnly
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};
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}
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/// This is just a pair of values to associate a set of parameter attributes
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/// with a parameter index.
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/// @brief ParameterAttributes with a parameter index.
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struct ParamAttrsWithIndex {
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uint16_t attrs; ///< The attributes that are set, or'd together
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uint16_t index; ///< Index of the parameter for which the attributes apply
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static ParamAttrsWithIndex get(uint16_t idx, uint16_t attrs) {
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ParamAttrsWithIndex P;
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P.index = idx;
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P.attrs = attrs;
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return P;
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}
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};
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/// @brief A vector of attribute/index pairs.
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typedef SmallVector<ParamAttrsWithIndex,4> ParamAttrsVector;
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/// @brief A more friendly way to reference the attributes.
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typedef ParamAttr::Attributes ParameterAttributes;
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/// This class represents a list of attribute/index pairs for parameter
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/// attributes. Each entry in the list contains the index of a function
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/// parameter and the associated ParameterAttributes. If a parameter's index is
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/// not present in the list, then no attributes are set for that parameter. The
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/// list may also be empty, but this does not occur in practice. An item in
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/// the list with an index of 0 refers to the function as a whole or its result.
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/// To construct a ParamAttrsList, you must first fill a ParamAttrsVector with
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/// the attribute/index pairs you wish to set. The list of attributes can be
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/// turned into a string of mnemonics suitable for LLVM Assembly output.
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/// Various accessors are provided to obtain information about the attributes.
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/// Note that objects of this class are "uniqued". The \p get method can return
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/// the pointer of an existing and identical instance. Consequently, reference
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/// counting is necessary in order to determine when the last reference to a
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/// ParamAttrsList of a given shape is dropped. Users of this class should use
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/// the addRef and dropRef methods to add/drop references. When the reference
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/// count goes to zero, the ParamAttrsList object is deleted.
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/// This class is used by Function, CallInst and InvokeInst to represent their
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/// sets of parameter attributes.
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/// @brief A List of ParameterAttributes.
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class ParamAttrsList : public FoldingSetNode {
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/// @name Construction
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/// @{
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private:
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// ParamAttrsList is uniqued, these should not be publicly available
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void operator=(const ParamAttrsList &); // Do not implement
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ParamAttrsList(const ParamAttrsList &); // Do not implement
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ParamAttrsList(); // Do not implement
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~ParamAttrsList(); // Private implementation
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/// Only the \p get method can invoke this when it wants to create a
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/// new instance.
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/// @brief Construct an ParamAttrsList from a ParamAttrsVector
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explicit ParamAttrsList(const ParamAttrsVector &attrVec)
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: attrs(attrVec), refCount(0) {}
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public:
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/// This method ensures the uniqueness of ParamAttrsList instances. The
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/// argument is a vector of attribute/index pairs as represented by the
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/// ParamAttrsWithIndex structure. The index values must be in strictly
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/// increasing order and ParamAttr::None is not allowed. The vector is
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/// used to construct the ParamAttrsList instance. If an instance with
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/// identical vector pairs exists, it will be returned instead of creating
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/// a new instance.
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/// @brief Get a ParamAttrsList instance.
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static const ParamAttrsList *get(const ParamAttrsVector &attrVec);
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/// Returns the ParamAttrsList obtained by modifying PAL using the supplied
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/// list of attribute/index pairs. Any existing attributes for the given
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/// index are replaced by the given attributes. If there were no attributes
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/// then the new ones are inserted. Attributes can be deleted by replacing
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/// them with ParamAttr::None. Index values must be strictly increasing.
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/// @brief Get a new ParamAttrsList instance by modifying an existing one.
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static const ParamAttrsList *getModified(const ParamAttrsList *PAL,
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const ParamAttrsVector &modVec);
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/// @brief Add the specified attributes to those in PAL at index idx.
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static const ParamAttrsList *includeAttrs(const ParamAttrsList *PAL,
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uint16_t idx, uint16_t attrs);
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/// @brief Remove the specified attributes from those in PAL at index idx.
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static const ParamAttrsList *excludeAttrs(const ParamAttrsList *PAL,
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uint16_t idx, uint16_t attrs);
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/// Returns whether each of the specified lists of attributes can be safely
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/// replaced with the other in a function or a function call.
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/// @brief Whether one attribute list can safely replace the other.
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static bool areCompatible(const ParamAttrsList *A, const ParamAttrsList *B);
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/// @}
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/// @name Accessors
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/// @{
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public:
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/// The parameter attributes for the \p indexth parameter are returned.
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/// The 0th parameter refers to the return type of the function. Note that
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/// the \p param_index is an index into the function's parameters, not an
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/// index into this class's list of attributes. The result of getParamIndex
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/// is always suitable input to this function.
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/// @returns The all the ParameterAttributes for the \p indexth parameter
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/// as a uint16_t of enumeration values OR'd together.
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/// @brief Get the attributes for a parameter
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uint16_t getParamAttrs(uint16_t param_index) const;
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/// This checks to see if the \p ith function parameter has the parameter
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/// attribute given by \p attr set.
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/// @returns true if the parameter attribute is set
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/// @brief Determine if a ParameterAttributes is set
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bool paramHasAttr(uint16_t i, ParameterAttributes attr) const {
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return getParamAttrs(i) & attr;
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}
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/// The set of ParameterAttributes set in Attributes is converted to a
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/// string of equivalent mnemonics. This is, presumably, for writing out
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/// the mnemonics for the assembly writer.
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/// @brief Convert parameter attribute bits to text
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static std::string getParamAttrsText(uint16_t Attributes);
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/// The \p Indexth parameter attribute is converted to string.
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/// @brief Get the text for the parmeter attributes for one parameter.
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std::string getParamAttrsTextByIndex(uint16_t Index) const {
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return getParamAttrsText(getParamAttrs(Index));
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}
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/// @brief Comparison operator for ParamAttrsList
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bool operator < (const ParamAttrsList& that) const {
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if (this->attrs.size() < that.attrs.size())
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return true;
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if (this->attrs.size() > that.attrs.size())
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return false;
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for (unsigned i = 0; i < attrs.size(); ++i) {
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if (attrs[i].index < that.attrs[i].index)
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return true;
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if (attrs[i].index > that.attrs[i].index)
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return false;
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if (attrs[i].attrs < that.attrs[i].attrs)
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return true;
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if (attrs[i].attrs > that.attrs[i].attrs)
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return false;
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}
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return false;
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}
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/// Returns the parameter index of a particular parameter attribute in this
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/// list of attributes. Note that the attr_index is an index into this
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/// class's list of attributes, not the index of a parameter. The result
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/// is the index of the parameter. Clients generally should not use this
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/// method. It is used internally by LLVM.
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/// @brief Get a parameter index
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uint16_t getParamIndex(unsigned attr_index) const {
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return attrs[attr_index].index;
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}
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uint16_t getParamAttrsAtIndex(unsigned attr_index) const {
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return attrs[attr_index].attrs;
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}
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/// Determines how many parameter attributes are set in this ParamAttrsList.
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/// This says nothing about how many parameters the function has. It also
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/// says nothing about the highest parameter index that has attributes.
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/// Clients generally should not use this method. It is used internally by
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/// LLVM.
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/// @returns the number of parameter attributes in this ParamAttrsList.
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/// @brief Return the number of parameter attributes this type has.
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unsigned size() const { return attrs.size(); }
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/// @brief Return the number of references to this ParamAttrsList.
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unsigned numRefs() const { return refCount; }
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/// @}
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/// @name Mutators
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/// @{
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public:
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/// Classes retaining references to ParamAttrsList objects should call this
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/// method to increment the reference count. This ensures that the
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/// ParamAttrsList object will not disappear until the class drops it.
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/// @brief Add a reference to this instance.
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void addRef() const { refCount++; }
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/// Classes retaining references to ParamAttrsList objects should call this
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/// method to decrement the reference count and possibly delete the
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/// ParamAttrsList object. This ensures that ParamAttrsList objects are
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/// cleaned up only when the last reference to them is dropped.
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/// @brief Drop a reference to this instance.
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void dropRef() const {
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assert(refCount != 0 && "dropRef without addRef");
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if (--refCount == 0)
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delete this;
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}
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/// @}
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/// @name Implementation Details
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/// @{
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public:
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void Profile(FoldingSetNodeID &ID) const;
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void dump() const;
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/// @}
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/// @name Data
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/// @{
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private:
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ParamAttrsVector attrs; ///< The list of attributes
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mutable unsigned refCount; ///< The number of references to this object
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/// @}
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};
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} // End llvm namespace
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#endif
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