88 lines
1.9 KiB
C++
88 lines
1.9 KiB
C++
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//===--- Block.cpp - Allocated blocks for the interpreter -------*- C++ -*-===//
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//
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// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
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// See https://llvm.org/LICENSE.txt for license information.
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// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
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//
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//===----------------------------------------------------------------------===//
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//
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// Defines the classes describing allocated blocks.
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//
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//===----------------------------------------------------------------------===//
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#include "InterpBlock.h"
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#include "Pointer.h"
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using namespace clang;
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using namespace clang::interp;
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void Block::addPointer(Pointer *P) {
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if (IsStatic)
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return;
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if (Pointers)
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Pointers->Prev = P;
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P->Next = Pointers;
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P->Prev = nullptr;
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Pointers = P;
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}
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void Block::removePointer(Pointer *P) {
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if (IsStatic)
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return;
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if (Pointers == P)
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Pointers = P->Next;
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if (P->Prev)
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P->Prev->Next = P->Next;
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if (P->Next)
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P->Next->Prev = P->Prev;
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}
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void Block::cleanup() {
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if (Pointers == nullptr && IsDead)
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(reinterpret_cast<DeadBlock *>(this + 1) - 1)->free();
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}
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void Block::movePointer(Pointer *From, Pointer *To) {
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if (IsStatic)
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return;
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To->Prev = From->Prev;
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if (To->Prev)
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To->Prev->Next = To;
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To->Next = From->Next;
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if (To->Next)
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To->Next->Prev = To;
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if (Pointers == From)
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Pointers = To;
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From->Prev = nullptr;
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From->Next = nullptr;
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}
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DeadBlock::DeadBlock(DeadBlock *&Root, Block *Blk)
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: Root(Root), B(Blk->Desc, Blk->IsStatic, Blk->IsExtern, /*isDead=*/true) {
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// Add the block to the chain of dead blocks.
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if (Root)
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Root->Prev = this;
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Next = Root;
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Prev = nullptr;
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Root = this;
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// Transfer pointers.
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B.Pointers = Blk->Pointers;
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for (Pointer *P = Blk->Pointers; P; P = P->Next)
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P->Pointee = &B;
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}
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void DeadBlock::free() {
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if (Prev)
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Prev->Next = Next;
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if (Next)
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Next->Prev = Prev;
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if (Root == this)
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Root = Next;
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::free(this);
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}
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