d8866befb8
build glue.
195 lines
7.1 KiB
C++
195 lines
7.1 KiB
C++
//===-- User.cpp - Implement the User class -------------------------------===//
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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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#include "llvm/IR/User.h"
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#include "llvm/IR/Constant.h"
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#include "llvm/IR/GlobalValue.h"
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#include "llvm/IR/Operator.h"
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namespace llvm {
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class BasicBlock;
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//===----------------------------------------------------------------------===//
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// User Class
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//===----------------------------------------------------------------------===//
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void User::replaceUsesOfWith(Value *From, Value *To) {
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if (From == To) return; // Duh what?
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assert((!isa<Constant>(this) || isa<GlobalValue>(this)) &&
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"Cannot call User::replaceUsesOfWith on a constant!");
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for (unsigned i = 0, E = getNumOperands(); i != E; ++i)
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if (getOperand(i) == From) { // Is This operand is pointing to oldval?
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// The side effects of this setOperand call include linking to
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// "To", adding "this" to the uses list of To, and
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// most importantly, removing "this" from the use list of "From".
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setOperand(i, To); // Fix it now...
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}
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}
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//===----------------------------------------------------------------------===//
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// User allocHungoffUses Implementation
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//===----------------------------------------------------------------------===//
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void User::allocHungoffUses(unsigned N, bool IsPhi) {
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assert(HasHungOffUses && "alloc must have hung off uses");
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static_assert(alignof(Use) >= alignof(Use::UserRef),
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"Alignment is insufficient for 'hung-off-uses' pieces");
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static_assert(alignof(Use::UserRef) >= alignof(BasicBlock *),
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"Alignment is insufficient for 'hung-off-uses' pieces");
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// Allocate the array of Uses, followed by a pointer (with bottom bit set) to
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// the User.
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size_t size = N * sizeof(Use) + sizeof(Use::UserRef);
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if (IsPhi)
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size += N * sizeof(BasicBlock *);
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Use *Begin = static_cast<Use*>(::operator new(size));
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Use *End = Begin + N;
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(void) new(End) Use::UserRef(const_cast<User*>(this), 1);
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setOperandList(Use::initTags(Begin, End));
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}
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void User::growHungoffUses(unsigned NewNumUses, bool IsPhi) {
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assert(HasHungOffUses && "realloc must have hung off uses");
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unsigned OldNumUses = getNumOperands();
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// We don't support shrinking the number of uses. We wouldn't have enough
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// space to copy the old uses in to the new space.
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assert(NewNumUses > OldNumUses && "realloc must grow num uses");
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Use *OldOps = getOperandList();
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allocHungoffUses(NewNumUses, IsPhi);
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Use *NewOps = getOperandList();
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// Now copy from the old operands list to the new one.
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std::copy(OldOps, OldOps + OldNumUses, NewOps);
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// If this is a Phi, then we need to copy the BB pointers too.
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if (IsPhi) {
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auto *OldPtr =
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reinterpret_cast<char *>(OldOps + OldNumUses) + sizeof(Use::UserRef);
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auto *NewPtr =
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reinterpret_cast<char *>(NewOps + NewNumUses) + sizeof(Use::UserRef);
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std::copy(OldPtr, OldPtr + (OldNumUses * sizeof(BasicBlock *)), NewPtr);
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}
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Use::zap(OldOps, OldOps + OldNumUses, true);
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}
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// This is a private struct used by `User` to track the co-allocated descriptor
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// section.
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struct DescriptorInfo {
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intptr_t SizeInBytes;
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};
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ArrayRef<const uint8_t> User::getDescriptor() const {
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auto MutableARef = const_cast<User *>(this)->getDescriptor();
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return {MutableARef.begin(), MutableARef.end()};
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}
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MutableArrayRef<uint8_t> User::getDescriptor() {
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assert(HasDescriptor && "Don't call otherwise!");
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assert(!HasHungOffUses && "Invariant!");
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auto *DI = reinterpret_cast<DescriptorInfo *>(getIntrusiveOperands()) - 1;
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assert(DI->SizeInBytes != 0 && "Should not have had a descriptor otherwise!");
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return MutableArrayRef<uint8_t>(
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reinterpret_cast<uint8_t *>(DI) - DI->SizeInBytes, DI->SizeInBytes);
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}
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//===----------------------------------------------------------------------===//
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// User operator new Implementations
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//===----------------------------------------------------------------------===//
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void *User::allocateFixedOperandUser(size_t Size, unsigned Us,
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unsigned DescBytes) {
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assert(Us < (1u << NumUserOperandsBits) && "Too many operands");
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static_assert(sizeof(DescriptorInfo) % sizeof(void *) == 0, "Required below");
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unsigned DescBytesToAllocate =
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DescBytes == 0 ? 0 : (DescBytes + sizeof(DescriptorInfo));
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assert(DescBytesToAllocate % sizeof(void *) == 0 &&
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"We need this to satisfy alignment constraints for Uses");
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uint8_t *Storage = static_cast<uint8_t *>(
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::operator new(Size + sizeof(Use) * Us + DescBytesToAllocate));
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Use *Start = reinterpret_cast<Use *>(Storage + DescBytesToAllocate);
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Use *End = Start + Us;
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User *Obj = reinterpret_cast<User*>(End);
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Obj->NumUserOperands = Us;
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Obj->HasHungOffUses = false;
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Obj->HasDescriptor = DescBytes != 0;
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Use::initTags(Start, End);
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if (DescBytes != 0) {
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auto *DescInfo = reinterpret_cast<DescriptorInfo *>(Storage + DescBytes);
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DescInfo->SizeInBytes = DescBytes;
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}
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return Obj;
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}
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void *User::operator new(size_t Size, unsigned Us) {
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return allocateFixedOperandUser(Size, Us, 0);
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}
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void *User::operator new(size_t Size, unsigned Us, unsigned DescBytes) {
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return allocateFixedOperandUser(Size, Us, DescBytes);
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}
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void *User::operator new(size_t Size) {
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// Allocate space for a single Use*
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void *Storage = ::operator new(Size + sizeof(Use *));
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Use **HungOffOperandList = static_cast<Use **>(Storage);
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User *Obj = reinterpret_cast<User *>(HungOffOperandList + 1);
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Obj->NumUserOperands = 0;
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Obj->HasHungOffUses = true;
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Obj->HasDescriptor = false;
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*HungOffOperandList = nullptr;
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return Obj;
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}
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//===----------------------------------------------------------------------===//
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// User operator delete Implementation
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//===----------------------------------------------------------------------===//
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void User::operator delete(void *Usr) {
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// Hung off uses use a single Use* before the User, while other subclasses
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// use a Use[] allocated prior to the user.
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User *Obj = static_cast<User *>(Usr);
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if (Obj->HasHungOffUses) {
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assert(!Obj->HasDescriptor && "not supported!");
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Use **HungOffOperandList = static_cast<Use **>(Usr) - 1;
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// drop the hung off uses.
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Use::zap(*HungOffOperandList, *HungOffOperandList + Obj->NumUserOperands,
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/* Delete */ true);
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::operator delete(HungOffOperandList);
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} else if (Obj->HasDescriptor) {
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Use *UseBegin = static_cast<Use *>(Usr) - Obj->NumUserOperands;
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Use::zap(UseBegin, UseBegin + Obj->NumUserOperands, /* Delete */ false);
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auto *DI = reinterpret_cast<DescriptorInfo *>(UseBegin) - 1;
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uint8_t *Storage = reinterpret_cast<uint8_t *>(DI) - DI->SizeInBytes;
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::operator delete(Storage);
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} else {
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Use *Storage = static_cast<Use *>(Usr) - Obj->NumUserOperands;
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Use::zap(Storage, Storage + Obj->NumUserOperands,
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/* Delete */ false);
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::operator delete(Storage);
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}
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}
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} // End llvm namespace
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