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This attribute indicates that the parameter or return pointer is dereferenceable. Practically speaking, loads from such a pointer within the associated byte range are safe to speculatively execute. Such pointer parameters are common in source languages (C++ references, for example). git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@213385 91177308-0d34-0410-b5e6-96231b3b80d8
386 lines
13 KiB
C++
386 lines
13 KiB
C++
//===- CallSite.h - Abstract Call & Invoke instrs ---------------*- 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 defines the CallSite class, which is a handy wrapper for code that
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// wants to treat Call and Invoke instructions in a generic way. When in non-
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// mutation context (e.g. an analysis) ImmutableCallSite should be used.
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// Finally, when some degree of customization is necessary between these two
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// extremes, CallSiteBase<> can be supplied with fine-tuned parameters.
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//
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// NOTE: These classes are supposed to have "value semantics". So they should be
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// passed by value, not by reference; they should not be "new"ed or "delete"d.
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// They are efficiently copyable, assignable and constructable, with cost
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// equivalent to copying a pointer (notice that they have only a single data
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// member). The internal representation carries a flag which indicates which of
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// the two variants is enclosed. This allows for cheaper checks when various
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// accessors of CallSite are employed.
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//
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//===----------------------------------------------------------------------===//
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#ifndef LLVM_IR_CALLSITE_H
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#define LLVM_IR_CALLSITE_H
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#include "llvm/ADT/PointerIntPair.h"
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#include "llvm/IR/Attributes.h"
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#include "llvm/IR/CallingConv.h"
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#include "llvm/IR/Instructions.h"
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namespace llvm {
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class CallInst;
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class InvokeInst;
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template <typename FunTy = const Function,
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typename ValTy = const Value,
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typename UserTy = const User,
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typename InstrTy = const Instruction,
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typename CallTy = const CallInst,
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typename InvokeTy = const InvokeInst,
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typename IterTy = User::const_op_iterator>
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class CallSiteBase {
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protected:
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PointerIntPair<InstrTy*, 1, bool> I;
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public:
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CallSiteBase() : I(nullptr, false) {}
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CallSiteBase(CallTy *CI) : I(CI, true) { assert(CI); }
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CallSiteBase(InvokeTy *II) : I(II, false) { assert(II); }
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CallSiteBase(ValTy *II) { *this = get(II); }
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protected:
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/// CallSiteBase::get - This static method is sort of like a constructor. It
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/// will create an appropriate call site for a Call or Invoke instruction, but
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/// it can also create a null initialized CallSiteBase object for something
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/// which is NOT a call site.
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///
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static CallSiteBase get(ValTy *V) {
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if (InstrTy *II = dyn_cast<InstrTy>(V)) {
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if (II->getOpcode() == Instruction::Call)
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return CallSiteBase(static_cast<CallTy*>(II));
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else if (II->getOpcode() == Instruction::Invoke)
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return CallSiteBase(static_cast<InvokeTy*>(II));
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}
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return CallSiteBase();
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}
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public:
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/// isCall - true if a CallInst is enclosed.
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/// Note that !isCall() does not mean it is an InvokeInst enclosed,
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/// it also could signify a NULL Instruction pointer.
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bool isCall() const { return I.getInt(); }
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/// isInvoke - true if a InvokeInst is enclosed.
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///
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bool isInvoke() const { return getInstruction() && !I.getInt(); }
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InstrTy *getInstruction() const { return I.getPointer(); }
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InstrTy *operator->() const { return I.getPointer(); }
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LLVM_EXPLICIT operator bool() const { return I.getPointer(); }
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/// getCalledValue - Return the pointer to function that is being called.
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///
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ValTy *getCalledValue() const {
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assert(getInstruction() && "Not a call or invoke instruction!");
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return *getCallee();
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}
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/// getCalledFunction - Return the function being called if this is a direct
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/// call, otherwise return null (if it's an indirect call).
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///
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FunTy *getCalledFunction() const {
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return dyn_cast<FunTy>(getCalledValue());
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}
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/// setCalledFunction - Set the callee to the specified value.
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///
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void setCalledFunction(Value *V) {
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assert(getInstruction() && "Not a call or invoke instruction!");
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*getCallee() = V;
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}
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/// isCallee - Determine whether the passed iterator points to the
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/// callee operand's Use.
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bool isCallee(Value::const_user_iterator UI) const {
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return isCallee(&UI.getUse());
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}
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/// Determine whether this Use is the callee operand's Use.
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bool isCallee(const Use *U) const { return getCallee() == U; }
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ValTy *getArgument(unsigned ArgNo) const {
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assert(arg_begin() + ArgNo < arg_end() && "Argument # out of range!");
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return *(arg_begin() + ArgNo);
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}
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void setArgument(unsigned ArgNo, Value* newVal) {
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assert(getInstruction() && "Not a call or invoke instruction!");
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assert(arg_begin() + ArgNo < arg_end() && "Argument # out of range!");
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getInstruction()->setOperand(ArgNo, newVal);
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}
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/// Given a value use iterator, returns the argument that corresponds to it.
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/// Iterator must actually correspond to an argument.
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unsigned getArgumentNo(Value::const_user_iterator I) const {
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return getArgumentNo(&I.getUse());
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}
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/// Given a use for an argument, get the argument number that corresponds to
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/// it.
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unsigned getArgumentNo(const Use *U) const {
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assert(getInstruction() && "Not a call or invoke instruction!");
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assert(arg_begin() <= U && U < arg_end()
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&& "Argument # out of range!");
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return U - arg_begin();
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}
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/// arg_iterator - The type of iterator to use when looping over actual
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/// arguments at this call site.
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typedef IterTy arg_iterator;
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/// arg_begin/arg_end - Return iterators corresponding to the actual argument
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/// list for a call site.
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IterTy arg_begin() const {
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assert(getInstruction() && "Not a call or invoke instruction!");
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// Skip non-arguments
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return (*this)->op_begin();
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}
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IterTy arg_end() const { return (*this)->op_end() - getArgumentEndOffset(); }
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bool arg_empty() const { return arg_end() == arg_begin(); }
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unsigned arg_size() const { return unsigned(arg_end() - arg_begin()); }
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/// getType - Return the type of the instruction that generated this call site
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///
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Type *getType() const { return (*this)->getType(); }
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/// getCaller - Return the caller function for this call site
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///
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FunTy *getCaller() const { return (*this)->getParent()->getParent(); }
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/// \brief Tests if this call site must be tail call optimized. Only a
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/// CallInst can be tail call optimized.
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bool isMustTailCall() const {
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return isCall() && cast<CallInst>(getInstruction())->isMustTailCall();
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}
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/// \brief Tests if this call site is marked as a tail call.
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bool isTailCall() const {
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return isCall() && cast<CallInst>(getInstruction())->isTailCall();
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}
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#define CALLSITE_DELEGATE_GETTER(METHOD) \
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InstrTy *II = getInstruction(); \
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return isCall() \
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? cast<CallInst>(II)->METHOD \
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: cast<InvokeInst>(II)->METHOD
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#define CALLSITE_DELEGATE_SETTER(METHOD) \
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InstrTy *II = getInstruction(); \
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if (isCall()) \
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cast<CallInst>(II)->METHOD; \
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else \
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cast<InvokeInst>(II)->METHOD
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/// getCallingConv/setCallingConv - get or set the calling convention of the
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/// call.
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CallingConv::ID getCallingConv() const {
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CALLSITE_DELEGATE_GETTER(getCallingConv());
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}
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void setCallingConv(CallingConv::ID CC) {
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CALLSITE_DELEGATE_SETTER(setCallingConv(CC));
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}
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/// getAttributes/setAttributes - get or set the parameter attributes of
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/// the call.
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const AttributeSet &getAttributes() const {
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CALLSITE_DELEGATE_GETTER(getAttributes());
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}
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void setAttributes(const AttributeSet &PAL) {
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CALLSITE_DELEGATE_SETTER(setAttributes(PAL));
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}
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/// \brief Return true if this function has the given attribute.
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bool hasFnAttr(Attribute::AttrKind A) const {
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CALLSITE_DELEGATE_GETTER(hasFnAttr(A));
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}
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/// \brief Return true if the call or the callee has the given attribute.
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bool paramHasAttr(unsigned i, Attribute::AttrKind A) const {
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CALLSITE_DELEGATE_GETTER(paramHasAttr(i, A));
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}
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/// @brief Extract the alignment for a call or parameter (0=unknown).
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uint16_t getParamAlignment(uint16_t i) const {
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CALLSITE_DELEGATE_GETTER(getParamAlignment(i));
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}
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/// @brief Extract the number of dereferenceable bytes for a call or
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/// parameter (0=unknown).
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uint64_t getDereferenceableBytes(uint16_t i) const {
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CALLSITE_DELEGATE_GETTER(getDereferenceableBytes(i));
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}
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/// \brief Return true if the call should not be treated as a call to a
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/// builtin.
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bool isNoBuiltin() const {
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CALLSITE_DELEGATE_GETTER(isNoBuiltin());
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}
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/// @brief Return true if the call should not be inlined.
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bool isNoInline() const {
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CALLSITE_DELEGATE_GETTER(isNoInline());
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}
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void setIsNoInline(bool Value = true) {
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CALLSITE_DELEGATE_SETTER(setIsNoInline(Value));
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}
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/// @brief Determine if the call does not access memory.
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bool doesNotAccessMemory() const {
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CALLSITE_DELEGATE_GETTER(doesNotAccessMemory());
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}
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void setDoesNotAccessMemory() {
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CALLSITE_DELEGATE_SETTER(setDoesNotAccessMemory());
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}
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/// @brief Determine if the call does not access or only reads memory.
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bool onlyReadsMemory() const {
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CALLSITE_DELEGATE_GETTER(onlyReadsMemory());
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}
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void setOnlyReadsMemory() {
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CALLSITE_DELEGATE_SETTER(setOnlyReadsMemory());
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}
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/// @brief Determine if the call cannot return.
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bool doesNotReturn() const {
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CALLSITE_DELEGATE_GETTER(doesNotReturn());
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}
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void setDoesNotReturn() {
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CALLSITE_DELEGATE_SETTER(setDoesNotReturn());
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}
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/// @brief Determine if the call cannot unwind.
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bool doesNotThrow() const {
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CALLSITE_DELEGATE_GETTER(doesNotThrow());
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}
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void setDoesNotThrow() {
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CALLSITE_DELEGATE_SETTER(setDoesNotThrow());
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}
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#undef CALLSITE_DELEGATE_GETTER
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#undef CALLSITE_DELEGATE_SETTER
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/// @brief Determine whether this argument is not captured.
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bool doesNotCapture(unsigned ArgNo) const {
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return paramHasAttr(ArgNo + 1, Attribute::NoCapture);
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}
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/// @brief Determine whether this argument is passed by value.
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bool isByValArgument(unsigned ArgNo) const {
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return paramHasAttr(ArgNo + 1, Attribute::ByVal);
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}
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/// @brief Determine whether this argument is passed in an alloca.
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bool isInAllocaArgument(unsigned ArgNo) const {
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return paramHasAttr(ArgNo + 1, Attribute::InAlloca);
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}
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/// @brief Determine whether this argument is passed by value or in an alloca.
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bool isByValOrInAllocaArgument(unsigned ArgNo) const {
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return paramHasAttr(ArgNo + 1, Attribute::ByVal) ||
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paramHasAttr(ArgNo + 1, Attribute::InAlloca);
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}
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/// @brief Determine if there are is an inalloca argument. Only the last
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/// argument can have the inalloca attribute.
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bool hasInAllocaArgument() const {
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return paramHasAttr(arg_size(), Attribute::InAlloca);
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}
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bool doesNotAccessMemory(unsigned ArgNo) const {
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return paramHasAttr(ArgNo + 1, Attribute::ReadNone);
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}
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bool onlyReadsMemory(unsigned ArgNo) const {
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return paramHasAttr(ArgNo + 1, Attribute::ReadOnly) ||
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paramHasAttr(ArgNo + 1, Attribute::ReadNone);
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}
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/// @brief Return true if the return value is known to be not null.
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/// This may be because it has the nonnull attribute, or because at least
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/// one byte is dereferenceable and the pointer is in addrspace(0).
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bool isReturnNonNull() const {
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if (paramHasAttr(0, Attribute::NonNull))
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return true;
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else if (getDereferenceableBytes(0) > 0 &&
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getType()->getPointerAddressSpace() == 0)
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return true;
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return false;
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}
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/// hasArgument - Returns true if this CallSite passes the given Value* as an
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/// argument to the called function.
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bool hasArgument(const Value *Arg) const {
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for (arg_iterator AI = this->arg_begin(), E = this->arg_end(); AI != E;
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++AI)
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if (AI->get() == Arg)
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return true;
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return false;
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}
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private:
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unsigned getArgumentEndOffset() const {
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if (isCall())
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return 1; // Skip Callee
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else
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return 3; // Skip BB, BB, Callee
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}
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IterTy getCallee() const {
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if (isCall()) // Skip Callee
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return cast<CallInst>(getInstruction())->op_end() - 1;
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else // Skip BB, BB, Callee
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return cast<InvokeInst>(getInstruction())->op_end() - 3;
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}
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};
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class CallSite : public CallSiteBase<Function, Value, User, Instruction,
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CallInst, InvokeInst, User::op_iterator> {
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typedef CallSiteBase<Function, Value, User, Instruction,
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CallInst, InvokeInst, User::op_iterator> Base;
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public:
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CallSite() {}
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CallSite(Base B) : Base(B) {}
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CallSite(Value* V) : Base(V) {}
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CallSite(CallInst *CI) : Base(CI) {}
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CallSite(InvokeInst *II) : Base(II) {}
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CallSite(Instruction *II) : Base(II) {}
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bool operator==(const CallSite &CS) const { return I == CS.I; }
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bool operator!=(const CallSite &CS) const { return I != CS.I; }
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bool operator<(const CallSite &CS) const {
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return getInstruction() < CS.getInstruction();
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}
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private:
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User::op_iterator getCallee() const;
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};
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/// ImmutableCallSite - establish a view to a call site for examination
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class ImmutableCallSite : public CallSiteBase<> {
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typedef CallSiteBase<> Base;
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public:
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ImmutableCallSite(const Value* V) : Base(V) {}
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ImmutableCallSite(const CallInst *CI) : Base(CI) {}
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ImmutableCallSite(const InvokeInst *II) : Base(II) {}
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ImmutableCallSite(const Instruction *II) : Base(II) {}
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ImmutableCallSite(CallSite CS) : Base(CS.getInstruction()) {}
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};
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} // End llvm namespace
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#endif
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