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This requires a number of steps. 1) Move value_use_iterator into the Value class as an implementation detail 2) Change it to actually be a *Use* iterator rather than a *User* iterator. 3) Add an adaptor which is a User iterator that always looks through the Use to the User. 4) Wrap these in Value::use_iterator and Value::user_iterator typedefs. 5) Add the range adaptors as Value::uses() and Value::users(). 6) Update *all* of the callers to correctly distinguish between whether they wanted a use_iterator (and to explicitly dig out the User when needed), or a user_iterator which makes the Use itself totally opaque. Because #6 requires churning essentially everything that walked the Use-Def chains, I went ahead and added all of the range adaptors and switched them to range-based loops where appropriate. Also because the renaming requires at least churning every line of code, it didn't make any sense to split these up into multiple commits -- all of which would touch all of the same lies of code. The result is still not quite optimal. The Value::use_iterator is a nice regular iterator, but Value::user_iterator is an iterator over User*s rather than over the User objects themselves. As a consequence, it fits a bit awkwardly into the range-based world and it has the weird extra-dereferencing 'operator->' that so many of our iterators have. I think this could be fixed by providing something which transforms a range of T&s into a range of T*s, but that *can* be separated into another patch, and it isn't yet 100% clear whether this is the right move. However, this change gets us most of the benefit and cleans up a substantial amount of code around Use and User. =] git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@203364 91177308-0d34-0410-b5e6-96231b3b80d8
584 lines
21 KiB
C++
584 lines
21 KiB
C++
//===-- llvm/Value.h - Definition of the Value class ------------*- 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 declares the Value class.
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//
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//===----------------------------------------------------------------------===//
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#ifndef LLVM_IR_VALUE_H
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#define LLVM_IR_VALUE_H
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#include "llvm-c/Core.h"
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#include "llvm/ADT/iterator_range.h"
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#include "llvm/IR/Use.h"
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#include "llvm/Support/CBindingWrapping.h"
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#include "llvm/Support/Casting.h"
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#include "llvm/Support/Compiler.h"
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namespace llvm {
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class APInt;
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class Argument;
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class AssemblyAnnotationWriter;
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class BasicBlock;
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class Constant;
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class DataLayout;
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class Function;
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class GlobalAlias;
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class GlobalValue;
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class GlobalVariable;
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class InlineAsm;
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class Instruction;
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class LLVMContext;
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class MDNode;
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class Module;
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class StringRef;
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class Twine;
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class Type;
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class ValueHandleBase;
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class ValueSymbolTable;
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class raw_ostream;
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template<typename ValueTy> class StringMapEntry;
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typedef StringMapEntry<Value*> ValueName;
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//===----------------------------------------------------------------------===//
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// Value Class
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//===----------------------------------------------------------------------===//
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/// This is a very important LLVM class. It is the base class of all values
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/// computed by a program that may be used as operands to other values. Value is
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/// the super class of other important classes such as Instruction and Function.
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/// All Values have a Type. Type is not a subclass of Value. Some values can
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/// have a name and they belong to some Module. Setting the name on the Value
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/// automatically updates the module's symbol table.
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///
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/// Every value has a "use list" that keeps track of which other Values are
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/// using this Value. A Value can also have an arbitrary number of ValueHandle
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/// objects that watch it and listen to RAUW and Destroy events. See
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/// llvm/IR/ValueHandle.h for details.
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///
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/// @brief LLVM Value Representation
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class Value {
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const unsigned char SubclassID; // Subclass identifier (for isa/dyn_cast)
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unsigned char HasValueHandle : 1; // Has a ValueHandle pointing to this?
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protected:
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/// SubclassOptionalData - This member is similar to SubclassData, however it
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/// is for holding information which may be used to aid optimization, but
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/// which may be cleared to zero without affecting conservative
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/// interpretation.
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unsigned char SubclassOptionalData : 7;
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private:
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template <typename UseT> // UseT == 'Use' or 'const Use'
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class use_iterator_impl
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: public std::iterator<std::forward_iterator_tag, UseT *, ptrdiff_t> {
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typedef std::iterator<std::forward_iterator_tag, UseT *, ptrdiff_t> super;
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UseT *U;
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explicit use_iterator_impl(UseT *u) : U(u) {}
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friend class Value;
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public:
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typedef typename super::reference reference;
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typedef typename super::pointer pointer;
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use_iterator_impl() : U() {}
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bool operator==(const use_iterator_impl &x) const { return U == x.U; }
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bool operator!=(const use_iterator_impl &x) const { return !operator==(x); }
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use_iterator_impl &operator++() { // Preincrement
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assert(U && "Cannot increment end iterator!");
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U = U->getNext();
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return *this;
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}
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use_iterator_impl operator++(int) { // Postincrement
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auto tmp = *this;
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++*this;
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return tmp;
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}
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UseT &operator*() const {
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assert(U && "Cannot dereference end iterator!");
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return *U;
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}
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UseT *operator->() const { return &operator*(); }
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operator use_iterator_impl<const UseT>() const {
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return use_iterator_impl<const UseT>(U);
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}
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};
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template <typename UserTy> // UserTy == 'User' or 'const User'
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class user_iterator_impl
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: public std::iterator<std::forward_iterator_tag, UserTy *, ptrdiff_t> {
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typedef std::iterator<std::forward_iterator_tag, UserTy *, ptrdiff_t> super;
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use_iterator_impl<Use> UI;
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explicit user_iterator_impl(Use *U) : UI(U) {}
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friend class Value;
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public:
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typedef typename super::reference reference;
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typedef typename super::pointer pointer;
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user_iterator_impl() {}
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bool operator==(const user_iterator_impl &x) const { return UI == x.UI; }
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bool operator!=(const user_iterator_impl &x) const { return !operator==(x); }
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/// \brief Returns true if this iterator is equal to user_end() on the value.
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bool atEnd() const { return *this == user_iterator_impl(); }
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user_iterator_impl &operator++() { // Preincrement
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++UI;
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return *this;
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}
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user_iterator_impl operator++(int) { // Postincrement
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auto tmp = *this;
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++*this;
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return tmp;
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}
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// Retrieve a pointer to the current User.
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UserTy *operator*() const {
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return UI->getUser();
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}
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UserTy *operator->() const { return operator*(); }
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operator user_iterator_impl<const UserTy>() const {
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return user_iterator_impl<const UserTy>(*UI);
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}
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Use &getUse() const { return *UI; }
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/// \brief Return the operand # of this use in its User.
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/// FIXME: Replace all callers with a direct call to Use::getOperandNo.
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unsigned getOperandNo() const { return UI->getOperandNo(); }
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};
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/// SubclassData - This member is defined by this class, but is not used for
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/// anything. Subclasses can use it to hold whatever state they find useful.
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/// This field is initialized to zero by the ctor.
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unsigned short SubclassData;
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Type *VTy;
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Use *UseList;
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friend class ValueSymbolTable; // Allow ValueSymbolTable to directly mod Name.
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friend class ValueHandleBase;
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ValueName *Name;
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void operator=(const Value &) LLVM_DELETED_FUNCTION;
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Value(const Value &) LLVM_DELETED_FUNCTION;
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protected:
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/// printCustom - Value subclasses can override this to implement custom
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/// printing behavior.
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virtual void printCustom(raw_ostream &O) const;
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Value(Type *Ty, unsigned scid);
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public:
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virtual ~Value();
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/// dump - Support for debugging, callable in GDB: V->dump()
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//
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void dump() const;
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/// print - Implement operator<< on Value.
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///
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void print(raw_ostream &O, AssemblyAnnotationWriter *AAW = 0) const;
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/// \brief Print the name of this Value out to the specified raw_ostream.
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/// This is useful when you just want to print 'int %reg126', not the
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/// instruction that generated it. If you specify a Module for context, then
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/// even constanst get pretty-printed; for example, the type of a null
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/// pointer is printed symbolically.
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void printAsOperand(raw_ostream &O, bool PrintType = true, const Module *M = 0) const;
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/// All values are typed, get the type of this value.
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///
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Type *getType() const { return VTy; }
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/// All values hold a context through their type.
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LLVMContext &getContext() const;
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// All values can potentially be named.
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bool hasName() const { return Name != 0 && SubclassID != MDStringVal; }
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ValueName *getValueName() const { return Name; }
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void setValueName(ValueName *VN) { Name = VN; }
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/// getName() - Return a constant reference to the value's name. This is cheap
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/// and guaranteed to return the same reference as long as the value is not
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/// modified.
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StringRef getName() const;
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/// setName() - Change the name of the value, choosing a new unique name if
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/// the provided name is taken.
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///
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/// \param Name The new name; or "" if the value's name should be removed.
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void setName(const Twine &Name);
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/// takeName - transfer the name from V to this value, setting V's name to
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/// empty. It is an error to call V->takeName(V).
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void takeName(Value *V);
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/// replaceAllUsesWith - Go through the uses list for this definition and make
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/// each use point to "V" instead of "this". After this completes, 'this's
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/// use list is guaranteed to be empty.
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///
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void replaceAllUsesWith(Value *V);
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//----------------------------------------------------------------------
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// Methods for handling the chain of uses of this Value.
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//
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bool use_empty() const { return UseList == 0; }
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typedef use_iterator_impl<Use> use_iterator;
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typedef use_iterator_impl<const Use> const_use_iterator;
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use_iterator use_begin() { return use_iterator(UseList); }
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const_use_iterator use_begin() const { return const_use_iterator(UseList); }
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use_iterator use_end() { return use_iterator(); }
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const_use_iterator use_end() const { return const_use_iterator(); }
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iterator_range<use_iterator> uses() {
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return iterator_range<use_iterator>(use_begin(), use_end());
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}
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iterator_range<const_use_iterator> uses() const {
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return iterator_range<const_use_iterator>(use_begin(), use_end());
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}
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typedef user_iterator_impl<User> user_iterator;
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typedef user_iterator_impl<const User> const_user_iterator;
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user_iterator user_begin() { return user_iterator(UseList); }
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const_user_iterator user_begin() const { return const_user_iterator(UseList); }
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user_iterator user_end() { return user_iterator(); }
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const_user_iterator user_end() const { return const_user_iterator(); }
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User *user_back() { return *user_begin(); }
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const User *user_back() const { return *user_begin(); }
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iterator_range<user_iterator> users() {
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return iterator_range<user_iterator>(user_begin(), user_end());
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}
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iterator_range<const_user_iterator> users() const {
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return iterator_range<const_user_iterator>(user_begin(), user_end());
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}
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/// hasOneUse - Return true if there is exactly one user of this value. This
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/// is specialized because it is a common request and does not require
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/// traversing the whole use list.
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///
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bool hasOneUse() const {
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const_use_iterator I = use_begin(), E = use_end();
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if (I == E) return false;
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return ++I == E;
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}
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/// hasNUses - Return true if this Value has exactly N users.
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///
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bool hasNUses(unsigned N) const;
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/// hasNUsesOrMore - Return true if this value has N users or more. This is
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/// logically equivalent to getNumUses() >= N.
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///
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bool hasNUsesOrMore(unsigned N) const;
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bool isUsedInBasicBlock(const BasicBlock *BB) const;
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/// getNumUses - This method computes the number of uses of this Value. This
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/// is a linear time operation. Use hasOneUse, hasNUses, or hasNUsesOrMore
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/// to check for specific values.
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unsigned getNumUses() const;
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/// addUse - This method should only be used by the Use class.
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///
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void addUse(Use &U) { U.addToList(&UseList); }
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/// An enumeration for keeping track of the concrete subclass of Value that
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/// is actually instantiated. Values of this enumeration are kept in the
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/// Value classes SubclassID field. They are used for concrete type
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/// identification.
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enum ValueTy {
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ArgumentVal, // This is an instance of Argument
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BasicBlockVal, // This is an instance of BasicBlock
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FunctionVal, // This is an instance of Function
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GlobalAliasVal, // This is an instance of GlobalAlias
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GlobalVariableVal, // This is an instance of GlobalVariable
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UndefValueVal, // This is an instance of UndefValue
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BlockAddressVal, // This is an instance of BlockAddress
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ConstantExprVal, // This is an instance of ConstantExpr
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ConstantAggregateZeroVal, // This is an instance of ConstantAggregateZero
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ConstantDataArrayVal, // This is an instance of ConstantDataArray
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ConstantDataVectorVal, // This is an instance of ConstantDataVector
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ConstantIntVal, // This is an instance of ConstantInt
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ConstantFPVal, // This is an instance of ConstantFP
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ConstantArrayVal, // This is an instance of ConstantArray
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ConstantStructVal, // This is an instance of ConstantStruct
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ConstantVectorVal, // This is an instance of ConstantVector
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ConstantPointerNullVal, // This is an instance of ConstantPointerNull
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MDNodeVal, // This is an instance of MDNode
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MDStringVal, // This is an instance of MDString
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InlineAsmVal, // This is an instance of InlineAsm
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PseudoSourceValueVal, // This is an instance of PseudoSourceValue
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FixedStackPseudoSourceValueVal, // This is an instance of
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// FixedStackPseudoSourceValue
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InstructionVal, // This is an instance of Instruction
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// Enum values starting at InstructionVal are used for Instructions;
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// don't add new values here!
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// Markers:
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ConstantFirstVal = FunctionVal,
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ConstantLastVal = ConstantPointerNullVal
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};
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/// getValueID - Return an ID for the concrete type of this object. This is
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/// used to implement the classof checks. This should not be used for any
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/// other purpose, as the values may change as LLVM evolves. Also, note that
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/// for instructions, the Instruction's opcode is added to InstructionVal. So
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/// this means three things:
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/// # there is no value with code InstructionVal (no opcode==0).
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/// # there are more possible values for the value type than in ValueTy enum.
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/// # the InstructionVal enumerator must be the highest valued enumerator in
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/// the ValueTy enum.
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unsigned getValueID() const {
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return SubclassID;
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}
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/// getRawSubclassOptionalData - Return the raw optional flags value
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/// contained in this value. This should only be used when testing two
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/// Values for equivalence.
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unsigned getRawSubclassOptionalData() const {
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return SubclassOptionalData;
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}
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/// clearSubclassOptionalData - Clear the optional flags contained in
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/// this value.
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void clearSubclassOptionalData() {
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SubclassOptionalData = 0;
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}
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/// hasSameSubclassOptionalData - Test whether the optional flags contained
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/// in this value are equal to the optional flags in the given value.
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bool hasSameSubclassOptionalData(const Value *V) const {
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return SubclassOptionalData == V->SubclassOptionalData;
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}
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/// intersectOptionalDataWith - Clear any optional flags in this value
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/// that are not also set in the given value.
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void intersectOptionalDataWith(const Value *V) {
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SubclassOptionalData &= V->SubclassOptionalData;
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}
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/// hasValueHandle - Return true if there is a value handle associated with
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/// this value.
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bool hasValueHandle() const { return HasValueHandle; }
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/// \brief Strips off any unneeded pointer casts, all-zero GEPs and aliases
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/// from the specified value, returning the original uncasted value.
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///
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/// If this is called on a non-pointer value, it returns 'this'.
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Value *stripPointerCasts();
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const Value *stripPointerCasts() const {
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return const_cast<Value*>(this)->stripPointerCasts();
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}
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/// \brief Strips off any unneeded pointer casts and all-zero GEPs from the
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/// specified value, returning the original uncasted value.
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///
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/// If this is called on a non-pointer value, it returns 'this'.
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Value *stripPointerCastsNoFollowAliases();
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const Value *stripPointerCastsNoFollowAliases() const {
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return const_cast<Value*>(this)->stripPointerCastsNoFollowAliases();
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}
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/// \brief Strips off unneeded pointer casts and all-constant GEPs from the
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/// specified value, returning the original pointer value.
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///
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/// If this is called on a non-pointer value, it returns 'this'.
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Value *stripInBoundsConstantOffsets();
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const Value *stripInBoundsConstantOffsets() const {
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return const_cast<Value*>(this)->stripInBoundsConstantOffsets();
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}
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/// \brief Strips like \c stripInBoundsConstantOffsets but also accumulates
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/// the constant offset stripped.
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///
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/// Stores the resulting constant offset stripped into the APInt provided.
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/// The provided APInt will be extended or truncated as needed to be the
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/// correct bitwidth for an offset of this pointer type.
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///
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/// If this is called on a non-pointer value, it returns 'this'.
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Value *stripAndAccumulateInBoundsConstantOffsets(const DataLayout &DL,
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APInt &Offset);
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const Value *stripAndAccumulateInBoundsConstantOffsets(const DataLayout &DL,
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APInt &Offset) const {
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return const_cast<Value *>(this)
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->stripAndAccumulateInBoundsConstantOffsets(DL, Offset);
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}
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/// \brief Strips off unneeded pointer casts and any in-bounds offsets from
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/// the specified value, returning the original pointer value.
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///
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/// If this is called on a non-pointer value, it returns 'this'.
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Value *stripInBoundsOffsets();
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const Value *stripInBoundsOffsets() const {
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return const_cast<Value*>(this)->stripInBoundsOffsets();
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}
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/// isDereferenceablePointer - Test if this value is always a pointer to
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/// allocated and suitably aligned memory for a simple load or store.
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bool isDereferenceablePointer() const;
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/// DoPHITranslation - If this value is a PHI node with CurBB as its parent,
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/// return the value in the PHI node corresponding to PredBB. If not, return
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/// ourself. This is useful if you want to know the value something has in a
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/// predecessor block.
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Value *DoPHITranslation(const BasicBlock *CurBB, const BasicBlock *PredBB);
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const Value *DoPHITranslation(const BasicBlock *CurBB,
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const BasicBlock *PredBB) const{
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return const_cast<Value*>(this)->DoPHITranslation(CurBB, PredBB);
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}
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/// MaximumAlignment - This is the greatest alignment value supported by
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/// load, store, and alloca instructions, and global values.
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static const unsigned MaximumAlignment = 1u << 29;
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/// mutateType - Mutate the type of this Value to be of the specified type.
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/// Note that this is an extremely dangerous operation which can create
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/// completely invalid IR very easily. It is strongly recommended that you
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/// recreate IR objects with the right types instead of mutating them in
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/// place.
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void mutateType(Type *Ty) {
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VTy = Ty;
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}
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protected:
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unsigned short getSubclassDataFromValue() const { return SubclassData; }
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void setValueSubclassData(unsigned short D) { SubclassData = D; }
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};
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|
|
inline raw_ostream &operator<<(raw_ostream &OS, const Value &V) {
|
|
V.print(OS);
|
|
return OS;
|
|
}
|
|
|
|
void Use::set(Value *V) {
|
|
if (Val) removeFromList();
|
|
Val = V;
|
|
if (V) V->addUse(*this);
|
|
}
|
|
|
|
|
|
// isa - Provide some specializations of isa so that we don't have to include
|
|
// the subtype header files to test to see if the value is a subclass...
|
|
//
|
|
template <> struct isa_impl<Constant, Value> {
|
|
static inline bool doit(const Value &Val) {
|
|
return Val.getValueID() >= Value::ConstantFirstVal &&
|
|
Val.getValueID() <= Value::ConstantLastVal;
|
|
}
|
|
};
|
|
|
|
template <> struct isa_impl<Argument, Value> {
|
|
static inline bool doit (const Value &Val) {
|
|
return Val.getValueID() == Value::ArgumentVal;
|
|
}
|
|
};
|
|
|
|
template <> struct isa_impl<InlineAsm, Value> {
|
|
static inline bool doit(const Value &Val) {
|
|
return Val.getValueID() == Value::InlineAsmVal;
|
|
}
|
|
};
|
|
|
|
template <> struct isa_impl<Instruction, Value> {
|
|
static inline bool doit(const Value &Val) {
|
|
return Val.getValueID() >= Value::InstructionVal;
|
|
}
|
|
};
|
|
|
|
template <> struct isa_impl<BasicBlock, Value> {
|
|
static inline bool doit(const Value &Val) {
|
|
return Val.getValueID() == Value::BasicBlockVal;
|
|
}
|
|
};
|
|
|
|
template <> struct isa_impl<Function, Value> {
|
|
static inline bool doit(const Value &Val) {
|
|
return Val.getValueID() == Value::FunctionVal;
|
|
}
|
|
};
|
|
|
|
template <> struct isa_impl<GlobalVariable, Value> {
|
|
static inline bool doit(const Value &Val) {
|
|
return Val.getValueID() == Value::GlobalVariableVal;
|
|
}
|
|
};
|
|
|
|
template <> struct isa_impl<GlobalAlias, Value> {
|
|
static inline bool doit(const Value &Val) {
|
|
return Val.getValueID() == Value::GlobalAliasVal;
|
|
}
|
|
};
|
|
|
|
template <> struct isa_impl<GlobalValue, Value> {
|
|
static inline bool doit(const Value &Val) {
|
|
return isa<GlobalVariable>(Val) || isa<Function>(Val) ||
|
|
isa<GlobalAlias>(Val);
|
|
}
|
|
};
|
|
|
|
template <> struct isa_impl<MDNode, Value> {
|
|
static inline bool doit(const Value &Val) {
|
|
return Val.getValueID() == Value::MDNodeVal;
|
|
}
|
|
};
|
|
|
|
// Value* is only 4-byte aligned.
|
|
template<>
|
|
class PointerLikeTypeTraits<Value*> {
|
|
typedef Value* PT;
|
|
public:
|
|
static inline void *getAsVoidPointer(PT P) { return P; }
|
|
static inline PT getFromVoidPointer(void *P) {
|
|
return static_cast<PT>(P);
|
|
}
|
|
enum { NumLowBitsAvailable = 2 };
|
|
};
|
|
|
|
// Create wrappers for C Binding types (see CBindingWrapping.h).
|
|
DEFINE_ISA_CONVERSION_FUNCTIONS(Value, LLVMValueRef)
|
|
|
|
/* Specialized opaque value conversions.
|
|
*/
|
|
inline Value **unwrap(LLVMValueRef *Vals) {
|
|
return reinterpret_cast<Value**>(Vals);
|
|
}
|
|
|
|
template<typename T>
|
|
inline T **unwrap(LLVMValueRef *Vals, unsigned Length) {
|
|
#ifdef DEBUG
|
|
for (LLVMValueRef *I = Vals, *E = Vals + Length; I != E; ++I)
|
|
cast<T>(*I);
|
|
#endif
|
|
(void)Length;
|
|
return reinterpret_cast<T**>(Vals);
|
|
}
|
|
|
|
inline LLVMValueRef *wrap(const Value **Vals) {
|
|
return reinterpret_cast<LLVMValueRef*>(const_cast<Value**>(Vals));
|
|
}
|
|
|
|
} // End llvm namespace
|
|
|
|
#endif
|