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+//===- llvm/IR/Statepoint.h - gc.statepoint utilities -----------*- C++ -*-===//
+//
+// The LLVM Compiler Infrastructure
+//
+// This file is distributed under the University of Illinois Open Source
+// License. See LICENSE.TXT for details.
+//
+//===----------------------------------------------------------------------===//
+//
+// This file contains utility functions and a wrapper class analogous to
+// CallSite for accessing the fields of gc.statepoint, gc.relocate,
+// gc.result intrinsics; and some general utilities helpful when dealing with
+// gc.statepoint.
+//
+//===----------------------------------------------------------------------===//
+
+#ifndef LLVM_IR_STATEPOINT_H
+#define LLVM_IR_STATEPOINT_H
+
+#include "llvm/ADT/Optional.h"
+#include "llvm/ADT/iterator_range.h"
+#include "llvm/IR/Attributes.h"
+#include "llvm/IR/BasicBlock.h"
+#include "llvm/IR/CallSite.h"
+#include "llvm/IR/Constants.h"
+#include "llvm/IR/Function.h"
+#include "llvm/IR/Instruction.h"
+#include "llvm/IR/Instructions.h"
+#include "llvm/IR/IntrinsicInst.h"
+#include "llvm/IR/Intrinsics.h"
+#include "llvm/Support/Casting.h"
+#include "llvm/Support/MathExtras.h"
+#include <cassert>
+#include <cstddef>
+#include <cstdint>
+#include <vector>
+
+namespace llvm {
+
+/// The statepoint intrinsic accepts a set of flags as its third argument.
+/// Valid values come out of this set.
+enum class StatepointFlags {
+ None = 0,
+ GCTransition = 1, ///< Indicates that this statepoint is a transition from
+ ///< GC-aware code to code that is not GC-aware.
+ /// Mark the deopt arguments associated with the statepoint as only being
+ /// "live-in". By default, deopt arguments are "live-through". "live-through"
+ /// requires that they the value be live on entry, on exit, and at any point
+ /// during the call. "live-in" only requires the value be available at the
+ /// start of the call. In particular, "live-in" values can be placed in
+ /// unused argument registers or other non-callee saved registers.
+ DeoptLiveIn = 2,
+
+ MaskAll = 3 ///< A bitmask that includes all valid flags.
+};
+
+class GCRelocateInst;
+class GCResultInst;
+
+bool isStatepoint(ImmutableCallSite CS);
+bool isStatepoint(const Value *V);
+bool isStatepoint(const Value &V);
+
+bool isGCRelocate(ImmutableCallSite CS);
+bool isGCRelocate(const Value *V);
+
+bool isGCResult(ImmutableCallSite CS);
+bool isGCResult(const Value *V);
+
+/// Analogous to CallSiteBase, this provides most of the actual
+/// functionality for Statepoint and ImmutableStatepoint. It is
+/// templatized to allow easily specializing of const and non-const
+/// concrete subtypes. This is structured analogous to CallSite
+/// rather than the IntrinsicInst.h helpers since we need to support
+/// invokable statepoints.
+template <typename FunTy, typename InstructionTy, typename ValueTy,
+ typename CallSiteTy>
+class StatepointBase {
+ CallSiteTy StatepointCS;
+
+protected:
+ explicit StatepointBase(InstructionTy *I) {
+ if (isStatepoint(I)) {
+ StatepointCS = CallSiteTy(I);
+ assert(StatepointCS && "isStatepoint implies CallSite");
+ }
+ }
+
+ explicit StatepointBase(CallSiteTy CS) {
+ if (isStatepoint(CS))
+ StatepointCS = CS;
+ }
+
+public:
+ using arg_iterator = typename CallSiteTy::arg_iterator;
+
+ enum {
+ IDPos = 0,
+ NumPatchBytesPos = 1,
+ CalledFunctionPos = 2,
+ NumCallArgsPos = 3,
+ FlagsPos = 4,
+ CallArgsBeginPos = 5,
+ };
+
+ void *operator new(size_t, unsigned) = delete;
+ void *operator new(size_t s) = delete;
+
+ explicit operator bool() const {
+ // We do not assign non-statepoint CallSites to StatepointCS.
+ return (bool)StatepointCS;
+ }
+
+ /// Return the underlying CallSite.
+ CallSiteTy getCallSite() const {
+ assert(*this && "check validity first!");
+ return StatepointCS;
+ }
+
+ uint64_t getFlags() const {
+ return cast<ConstantInt>(getCallSite().getArgument(FlagsPos))
+ ->getZExtValue();
+ }
+
+ /// Return the ID associated with this statepoint.
+ uint64_t getID() const {
+ const Value *IDVal = getCallSite().getArgument(IDPos);
+ return cast<ConstantInt>(IDVal)->getZExtValue();
+ }
+
+ /// Return the number of patchable bytes associated with this statepoint.
+ uint32_t getNumPatchBytes() const {
+ const Value *NumPatchBytesVal = getCallSite().getArgument(NumPatchBytesPos);
+ uint64_t NumPatchBytes =
+ cast<ConstantInt>(NumPatchBytesVal)->getZExtValue();
+ assert(isInt<32>(NumPatchBytes) && "should fit in 32 bits!");
+ return NumPatchBytes;
+ }
+
+ /// Return the value actually being called or invoked.
+ ValueTy *getCalledValue() const {
+ return getCallSite().getArgument(CalledFunctionPos);
+ }
+
+ InstructionTy *getInstruction() const {
+ return getCallSite().getInstruction();
+ }
+
+ /// Return the function being called if this is a direct call, otherwise
+ /// return null (if it's an indirect call).
+ FunTy *getCalledFunction() const {
+ return dyn_cast<Function>(getCalledValue());
+ }
+
+ /// Return the caller function for this statepoint.
+ FunTy *getCaller() const { return getCallSite().getCaller(); }
+
+ /// Determine if the statepoint cannot unwind.
+ bool doesNotThrow() const {
+ Function *F = getCalledFunction();
+ return getCallSite().doesNotThrow() || (F ? F->doesNotThrow() : false);
+ }
+
+ /// Return the type of the value returned by the call underlying the
+ /// statepoint.
+ Type *getActualReturnType() const {
+ auto *FTy = cast<FunctionType>(
+ cast<PointerType>(getCalledValue()->getType())->getElementType());
+ return FTy->getReturnType();
+ }
+
+ /// Number of arguments to be passed to the actual callee.
+ int getNumCallArgs() const {
+ const Value *NumCallArgsVal = getCallSite().getArgument(NumCallArgsPos);
+ return cast<ConstantInt>(NumCallArgsVal)->getZExtValue();
+ }
+
+ size_t arg_size() const { return getNumCallArgs(); }
+ typename CallSiteTy::arg_iterator arg_begin() const {
+ assert(CallArgsBeginPos <= (int)getCallSite().arg_size());
+ return getCallSite().arg_begin() + CallArgsBeginPos;
+ }
+ typename CallSiteTy::arg_iterator arg_end() const {
+ auto I = arg_begin() + arg_size();
+ assert((getCallSite().arg_end() - I) >= 0);
+ return I;
+ }
+
+ ValueTy *getArgument(unsigned Index) {
+ assert(Index < arg_size() && "out of bounds!");
+ return *(arg_begin() + Index);
+ }
+
+ /// range adapter for call arguments
+ iterator_range<arg_iterator> call_args() const {
+ return make_range(arg_begin(), arg_end());
+ }
+
+ /// \brief Return true if the call or the callee has the given attribute.
+ bool paramHasAttr(unsigned i, Attribute::AttrKind A) const {
+ Function *F = getCalledFunction();
+ return getCallSite().paramHasAttr(i + CallArgsBeginPos, A) ||
+ (F ? F->getAttributes().hasAttribute(i, A) : false);
+ }
+
+ /// Number of GC transition args.
+ int getNumTotalGCTransitionArgs() const {
+ const Value *NumGCTransitionArgs = *arg_end();
+ return cast<ConstantInt>(NumGCTransitionArgs)->getZExtValue();
+ }
+ typename CallSiteTy::arg_iterator gc_transition_args_begin() const {
+ auto I = arg_end() + 1;
+ assert((getCallSite().arg_end() - I) >= 0);
+ return I;
+ }
+ typename CallSiteTy::arg_iterator gc_transition_args_end() const {
+ auto I = gc_transition_args_begin() + getNumTotalGCTransitionArgs();
+ assert((getCallSite().arg_end() - I) >= 0);
+ return I;
+ }
+
+ /// range adapter for GC transition arguments
+ iterator_range<arg_iterator> gc_transition_args() const {
+ return make_range(gc_transition_args_begin(), gc_transition_args_end());
+ }
+
+ /// Number of additional arguments excluding those intended
+ /// for garbage collection.
+ int getNumTotalVMSArgs() const {
+ const Value *NumVMSArgs = *gc_transition_args_end();
+ return cast<ConstantInt>(NumVMSArgs)->getZExtValue();
+ }
+
+ typename CallSiteTy::arg_iterator deopt_begin() const {
+ auto I = gc_transition_args_end() + 1;
+ assert((getCallSite().arg_end() - I) >= 0);
+ return I;
+ }
+ typename CallSiteTy::arg_iterator deopt_end() const {
+ auto I = deopt_begin() + getNumTotalVMSArgs();
+ assert((getCallSite().arg_end() - I) >= 0);
+ return I;
+ }
+
+ /// range adapter for vm state arguments
+ iterator_range<arg_iterator> deopt_operands() const {
+ return make_range(deopt_begin(), deopt_end());
+ }
+
+ typename CallSiteTy::arg_iterator gc_args_begin() const {
+ return deopt_end();
+ }
+ typename CallSiteTy::arg_iterator gc_args_end() const {
+ return getCallSite().arg_end();
+ }
+
+ unsigned gcArgsStartIdx() const {
+ return gc_args_begin() - getInstruction()->op_begin();
+ }
+
+ /// range adapter for gc arguments
+ iterator_range<arg_iterator> gc_args() const {
+ return make_range(gc_args_begin(), gc_args_end());
+ }
+
+ /// Get list of all gc reloactes linked to this statepoint
+ /// May contain several relocations for the same base/derived pair.
+ /// For example this could happen due to relocations on unwinding
+ /// path of invoke.
+ std::vector<const GCRelocateInst *> getRelocates() const;
+
+ /// Get the experimental_gc_result call tied to this statepoint. Can be
+ /// nullptr if there isn't a gc_result tied to this statepoint. Guaranteed to
+ /// be a CallInst if non-null.
+ const GCResultInst *getGCResult() const {
+ for (auto *U : getInstruction()->users())
+ if (auto *GRI = dyn_cast<GCResultInst>(U))
+ return GRI;
+ return nullptr;
+ }
+
+#ifndef NDEBUG
+ /// Asserts if this statepoint is malformed. Common cases for failure
+ /// include incorrect length prefixes for variable length sections or
+ /// illegal values for parameters.
+ void verify() {
+ assert(getNumCallArgs() >= 0 &&
+ "number of arguments to actually callee can't be negative");
+
+ // The internal asserts in the iterator accessors do the rest.
+ (void)arg_begin();
+ (void)arg_end();
+ (void)gc_transition_args_begin();
+ (void)gc_transition_args_end();
+ (void)deopt_begin();
+ (void)deopt_end();
+ (void)gc_args_begin();
+ (void)gc_args_end();
+ }
+#endif
+};
+
+/// A specialization of it's base class for read only access
+/// to a gc.statepoint.
+class ImmutableStatepoint
+ : public StatepointBase<const Function, const Instruction, const Value,
+ ImmutableCallSite> {
+ using Base =
+ StatepointBase<const Function, const Instruction, const Value,
+ ImmutableCallSite>;
+
+public:
+ explicit ImmutableStatepoint(const Instruction *I) : Base(I) {}
+ explicit ImmutableStatepoint(ImmutableCallSite CS) : Base(CS) {}
+};
+
+/// A specialization of it's base class for read-write access
+/// to a gc.statepoint.
+class Statepoint
+ : public StatepointBase<Function, Instruction, Value, CallSite> {
+ using Base = StatepointBase<Function, Instruction, Value, CallSite>;
+
+public:
+ explicit Statepoint(Instruction *I) : Base(I) {}
+ explicit Statepoint(CallSite CS) : Base(CS) {}
+};
+
+/// Common base class for representing values projected from a statepoint.
+/// Currently, the only projections available are gc.result and gc.relocate.
+class GCProjectionInst : public IntrinsicInst {
+public:
+ static bool classof(const IntrinsicInst *I) {
+ return I->getIntrinsicID() == Intrinsic::experimental_gc_relocate ||
+ I->getIntrinsicID() == Intrinsic::experimental_gc_result;
+ }
+
+ static bool classof(const Value *V) {
+ return isa<IntrinsicInst>(V) && classof(cast<IntrinsicInst>(V));
+ }
+
+ /// Return true if this relocate is tied to the invoke statepoint.
+ /// This includes relocates which are on the unwinding path.
+ bool isTiedToInvoke() const {
+ const Value *Token = getArgOperand(0);
+
+ return isa<LandingPadInst>(Token) || isa<InvokeInst>(Token);
+ }
+
+ /// The statepoint with which this gc.relocate is associated.
+ const Instruction *getStatepoint() const {
+ const Value *Token = getArgOperand(0);
+
+ // This takes care both of relocates for call statepoints and relocates
+ // on normal path of invoke statepoint.
+ if (!isa<LandingPadInst>(Token)) {
+ assert(isStatepoint(Token));
+ return cast<Instruction>(Token);
+ }
+
+ // This relocate is on exceptional path of an invoke statepoint
+ const BasicBlock *InvokeBB =
+ cast<Instruction>(Token)->getParent()->getUniquePredecessor();
+
+ assert(InvokeBB && "safepoints should have unique landingpads");
+ assert(InvokeBB->getTerminator() &&
+ "safepoint block should be well formed");
+ assert(isStatepoint(InvokeBB->getTerminator()));
+
+ return InvokeBB->getTerminator();
+ }
+};
+
+/// Represents calls to the gc.relocate intrinsic.
+class GCRelocateInst : public GCProjectionInst {
+public:
+ static bool classof(const IntrinsicInst *I) {
+ return I->getIntrinsicID() == Intrinsic::experimental_gc_relocate;
+ }
+
+ static bool classof(const Value *V) {
+ return isa<IntrinsicInst>(V) && classof(cast<IntrinsicInst>(V));
+ }
+
+ /// The index into the associate statepoint's argument list
+ /// which contains the base pointer of the pointer whose
+ /// relocation this gc.relocate describes.
+ unsigned getBasePtrIndex() const {
+ return cast<ConstantInt>(getArgOperand(1))->getZExtValue();
+ }
+
+ /// The index into the associate statepoint's argument list which
+ /// contains the pointer whose relocation this gc.relocate describes.
+ unsigned getDerivedPtrIndex() const {
+ return cast<ConstantInt>(getArgOperand(2))->getZExtValue();
+ }
+
+ Value *getBasePtr() const {
+ ImmutableCallSite CS(getStatepoint());
+ return *(CS.arg_begin() + getBasePtrIndex());
+ }
+
+ Value *getDerivedPtr() const {
+ ImmutableCallSite CS(getStatepoint());
+ return *(CS.arg_begin() + getDerivedPtrIndex());
+ }
+};
+
+/// Represents calls to the gc.result intrinsic.
+class GCResultInst : public GCProjectionInst {
+public:
+ static bool classof(const IntrinsicInst *I) {
+ return I->getIntrinsicID() == Intrinsic::experimental_gc_result;
+ }
+
+ static bool classof(const Value *V) {
+ return isa<IntrinsicInst>(V) && classof(cast<IntrinsicInst>(V));
+ }
+};
+
+template <typename FunTy, typename InstructionTy, typename ValueTy,
+ typename CallSiteTy>
+std::vector<const GCRelocateInst *>
+StatepointBase<FunTy, InstructionTy, ValueTy, CallSiteTy>::getRelocates()
+ const {
+
+ std::vector<const GCRelocateInst *> Result;
+
+ CallSiteTy StatepointCS = getCallSite();
+
+ // Search for relocated pointers. Note that working backwards from the
+ // gc_relocates ensures that we only get pairs which are actually relocated
+ // and used after the statepoint.
+ for (const User *U : getInstruction()->users())
+ if (auto *Relocate = dyn_cast<GCRelocateInst>(U))
+ Result.push_back(Relocate);
+
+ if (!StatepointCS.isInvoke())
+ return Result;
+
+ // We need to scan thorough exceptional relocations if it is invoke statepoint
+ LandingPadInst *LandingPad =
+ cast<InvokeInst>(getInstruction())->getLandingPadInst();
+
+ // Search for gc relocates that are attached to this landingpad.
+ for (const User *LandingPadUser : LandingPad->users()) {
+ if (auto *Relocate = dyn_cast<GCRelocateInst>(LandingPadUser))
+ Result.push_back(Relocate);
+ }
+ return Result;
+}
+
+/// Call sites that get wrapped by a gc.statepoint (currently only in
+/// RewriteStatepointsForGC and potentially in other passes in the future) can
+/// have attributes that describe properties of gc.statepoint call they will be
+/// eventually be wrapped in. This struct is used represent such directives.
+struct StatepointDirectives {
+ Optional<uint32_t> NumPatchBytes;
+ Optional<uint64_t> StatepointID;
+
+ static const uint64_t DefaultStatepointID = 0xABCDEF00;
+ static const uint64_t DeoptBundleStatepointID = 0xABCDEF0F;
+};
+
+/// Parse out statepoint directives from the function attributes present in \p
+/// AS.
+StatepointDirectives parseStatepointDirectivesFromAttrs(AttributeList AS);
+
+/// Return \c true if the \p Attr is an attribute that is a statepoint
+/// directive.
+bool isStatepointDirectiveAttr(Attribute Attr);
+
+} // end namespace llvm
+
+#endif // LLVM_IR_STATEPOINT_H