mirror of
https://github.com/c64scene-ar/llvm-6502.git
synced 2024-12-17 03:30:28 +00:00
36397f5034
still under discussion. git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@40549 91177308-0d34-0410-b5e6-96231b3b80d8
223 lines
9.4 KiB
C++
223 lines
9.4 KiB
C++
//===-- llvm/ParameterAttributes.h - Container for ParamAttrs ---*- C++ -*-===//
|
|
//
|
|
// The LLVM Compiler Infrastructure
|
|
//
|
|
// This file was developed by Reid Spencer and is distributed under the
|
|
// University of Illinois Open Source License. See LICENSE.TXT for details.
|
|
//
|
|
//===----------------------------------------------------------------------===//
|
|
//
|
|
// This file contains the types necessary to represent the parameter attributes
|
|
// associated with functions and their calls.
|
|
//
|
|
// The implementations of these classes live in lib/VMCore/Function.cpp.
|
|
//
|
|
//===----------------------------------------------------------------------===//
|
|
|
|
#ifndef LLVM_PARAMETER_ATTRIBUTES_H
|
|
#define LLVM_PARAMETER_ATTRIBUTES_H
|
|
|
|
#include "llvm/ADT/SmallVector.h"
|
|
#include "llvm/ADT/FoldingSet.h"
|
|
|
|
namespace llvm {
|
|
namespace ParamAttr {
|
|
|
|
/// Function parameters and results can have attributes to indicate how they
|
|
/// should be treated by optimizations and code generation. This enumeration
|
|
/// lists the attributes that can be associated with parameters or function
|
|
/// results.
|
|
/// @brief Function parameter attributes.
|
|
enum Attributes {
|
|
None = 0, ///< No attributes have been set
|
|
ZExt = 1 << 0, ///< Zero extended before/after call
|
|
SExt = 1 << 1, ///< Sign extended before/after call
|
|
NoReturn = 1 << 2, ///< Mark the function as not returning
|
|
InReg = 1 << 3, ///< Force argument to be passed in register
|
|
StructRet = 1 << 4, ///< Hidden pointer to structure to return
|
|
NoUnwind = 1 << 5, ///< Function doesn't unwind stack
|
|
NoAlias = 1 << 6, ///< Considered to not alias after call
|
|
ByVal = 1 << 7, ///< Pass structure by value
|
|
Nest = 1 << 8 ///< Nested function static chain
|
|
};
|
|
|
|
}
|
|
|
|
/// This is just a pair of values to associate a set of parameter attributes
|
|
/// with a parameter index.
|
|
/// @brief ParameterAttributes with a parameter index.
|
|
struct ParamAttrsWithIndex {
|
|
uint16_t attrs; ///< The attributes that are set, |'d together
|
|
uint16_t index; ///< Index of the parameter for which the attributes apply
|
|
|
|
static ParamAttrsWithIndex get(uint16_t idx, uint16_t attrs) {
|
|
ParamAttrsWithIndex P;
|
|
P.index = idx;
|
|
P.attrs = attrs;
|
|
return P;
|
|
}
|
|
};
|
|
|
|
/// @brief A vector of attribute/index pairs.
|
|
typedef SmallVector<ParamAttrsWithIndex,4> ParamAttrsVector;
|
|
|
|
/// @brief A more friendly way to reference the attributes.
|
|
typedef ParamAttr::Attributes ParameterAttributes;
|
|
|
|
/// This class represents a list of attribute/index pairs for parameter
|
|
/// attributes. Each entry in the list contains the index of a function
|
|
/// parameter and the associated ParameterAttributes. If a parameter's index is
|
|
/// not present in the list, then no attributes are set for that parameter. The
|
|
/// list may also be empty, but this does not occur in practice. An item in
|
|
/// the list with an index of 0 refers to the function as a whole or its result.
|
|
/// To construct a ParamAttrsList, you must first fill a ParamAttrsVector with
|
|
/// the attribute/index pairs you wish to set. The list of attributes can be
|
|
/// turned into a string of mnemonics suitable for LLVM Assembly output.
|
|
/// Various accessors are provided to obtain information about the attributes.
|
|
/// Note that objects of this class are "uniqued". The \p get method can return
|
|
/// the pointer of an existing and identical instance. Consequently, reference
|
|
/// counting is necessary in order to determine when the last reference to a
|
|
/// ParamAttrsList of a given shape is dropped. Users of this class should use
|
|
/// the addRef and dropRef methods to add/drop references. When the reference
|
|
/// count goes to zero, the ParamAttrsList object is deleted.
|
|
/// This class is used by Function, CallInst and InvokeInst to represent their
|
|
/// sets of parameter attributes.
|
|
/// @brief A List of ParameterAttributes.
|
|
class ParamAttrsList : public FoldingSetNode {
|
|
/// @name Construction
|
|
/// @{
|
|
private:
|
|
// ParamAttrsList is uniqued, these should not be publicly available
|
|
void operator=(const ParamAttrsList &); // Do not implement
|
|
ParamAttrsList(const ParamAttrsList &); // Do not implement
|
|
ParamAttrsList(); // Do not implement
|
|
~ParamAttrsList(); // Private implementation
|
|
|
|
/// Only the \p get method can invoke this when it wants to create a
|
|
/// new instance.
|
|
/// @brief Construct an ParamAttrsList from a ParamAttrsVector
|
|
explicit ParamAttrsList(const ParamAttrsVector &attrVec)
|
|
: attrs(attrVec), refCount(0) {}
|
|
|
|
public:
|
|
/// This method ensures the uniqueness of ParamAttrsList instances. The
|
|
/// argument is a vector of attribute/index pairs as represented by the
|
|
/// ParamAttrsWithIndex structure. The vector is used in the construction of
|
|
/// the ParamAttrsList instance. If an instance with identical vector pairs
|
|
/// exists, it will be returned instead of creating a new instance.
|
|
/// @brief Get a ParamAttrsList instance.
|
|
static ParamAttrsList *get(const ParamAttrsVector &attrVec);
|
|
|
|
/// @}
|
|
/// @name Accessors
|
|
/// @{
|
|
public:
|
|
/// The parameter attributes for the \p indexth parameter are returned.
|
|
/// The 0th parameter refers to the return type of the function. Note that
|
|
/// the \p param_index is an index into the function's parameters, not an
|
|
/// index into this class's list of attributes. The result of getParamIndex
|
|
/// is always suitable input to this function.
|
|
/// @returns The all the ParameterAttributes for the \p indexth parameter
|
|
/// as a uint16_t of enumeration values OR'd together.
|
|
/// @brief Get the attributes for a parameter
|
|
uint16_t getParamAttrs(uint16_t param_index) const;
|
|
|
|
/// This checks to see if the \p ith function parameter has the parameter
|
|
/// attribute given by \p attr set.
|
|
/// @returns true if the parameter attribute is set
|
|
/// @brief Determine if a ParameterAttributes is set
|
|
bool paramHasAttr(uint16_t i, ParameterAttributes attr) const {
|
|
return getParamAttrs(i) & attr;
|
|
}
|
|
|
|
/// The set of ParameterAttributes set in Attributes is converted to a
|
|
/// string of equivalent mnemonics. This is, presumably, for writing out
|
|
/// the mnemonics for the assembly writer.
|
|
/// @brief Convert parameter attribute bits to text
|
|
static std::string getParamAttrsText(uint16_t Attributes);
|
|
|
|
/// The \p Indexth parameter attribute is converted to string.
|
|
/// @brief Get the text for the parmeter attributes for one parameter.
|
|
std::string getParamAttrsTextByIndex(uint16_t Index) const {
|
|
return getParamAttrsText(getParamAttrs(Index));
|
|
}
|
|
|
|
/// @brief Comparison operator for ParamAttrsList
|
|
bool operator < (const ParamAttrsList& that) const {
|
|
if (this->attrs.size() < that.attrs.size())
|
|
return true;
|
|
if (this->attrs.size() > that.attrs.size())
|
|
return false;
|
|
for (unsigned i = 0; i < attrs.size(); ++i) {
|
|
if (attrs[i].index < that.attrs[i].index)
|
|
return true;
|
|
if (attrs[i].index > that.attrs[i].index)
|
|
return false;
|
|
if (attrs[i].attrs < that.attrs[i].attrs)
|
|
return true;
|
|
if (attrs[i].attrs > that.attrs[i].attrs)
|
|
return false;
|
|
}
|
|
return false;
|
|
}
|
|
|
|
/// Returns the parameter index of a particular parameter attribute in this
|
|
/// list of attributes. Note that the attr_index is an index into this
|
|
/// class's list of attributes, not the index of a parameter. The result
|
|
/// is the index of the parameter. Clients generally should not use this
|
|
/// method. It is used internally by LLVM.
|
|
/// @brief Get a parameter index
|
|
uint16_t getParamIndex(unsigned attr_index) const {
|
|
return attrs[attr_index].index;
|
|
}
|
|
|
|
uint16_t getParamAttrsAtIndex(unsigned attr_index) const {
|
|
return attrs[attr_index].attrs;
|
|
}
|
|
|
|
/// Determines how many parameter attributes are set in this ParamAttrsList.
|
|
/// This says nothing about how many parameters the function has. It also
|
|
/// says nothing about the highest parameter index that has attributes.
|
|
/// Clients generally should not use this method. It is used internally by
|
|
/// LLVM.
|
|
/// @returns the number of parameter attributes in this ParamAttrsList.
|
|
/// @brief Return the number of parameter attributes this type has.
|
|
unsigned size() const { return attrs.size(); }
|
|
|
|
/// Classes retaining references to ParamAttrsList objects should call this
|
|
/// method to increment the reference count. This ensures that the
|
|
/// ParamAttrsList object will not disappear until the class drops it.
|
|
/// @brief Add a reference to this instance.
|
|
void addRef() const { refCount++; }
|
|
|
|
/// Classes retaining references to ParamAttrsList objects should call this
|
|
/// method to decrement the reference count and possibly delete the
|
|
/// ParamAttrsList object. This ensures that ParamAttrsList objects are
|
|
/// cleaned up only when the last reference to them is dropped.
|
|
/// @brief Drop a reference to this instance.
|
|
void dropRef() const {
|
|
assert(refCount != 0 && "dropRef without addRef");
|
|
if (--refCount == 0)
|
|
delete this;
|
|
}
|
|
|
|
/// @}
|
|
/// @name Implementation Details
|
|
/// @{
|
|
public:
|
|
void Profile(FoldingSetNodeID &ID) const;
|
|
void dump() const;
|
|
|
|
/// @}
|
|
/// @name Data
|
|
/// @{
|
|
private:
|
|
ParamAttrsVector attrs; ///< The list of attributes
|
|
mutable unsigned refCount; ///< The number of references to this object
|
|
/// @}
|
|
};
|
|
|
|
} // End llvm namespace
|
|
|
|
#endif
|