reference, declaration → definition definition → references, declarations, derived classes, virtual overrides reference to multiple definitions → definitions unreferenced |
1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48 49 50 51 52 53 54 55 56 57 58 59 60 61 62 63 64 65 66 67 68 69 70 71 72 73 74 75 76 77 78 | //===--- InterpStack.cpp - Stack implementation for the VM ------*- C++ -*-===// // // Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions. // See https://llvm.org/LICENSE.txt for license information. // SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception // //===----------------------------------------------------------------------===// #include <cassert> #include <cstdlib> #include "InterpStack.h" using namespace clang; using namespace clang::interp; InterpStack::~InterpStack() { clear(); } void InterpStack::clear() { if (Chunk && Chunk->Next) free(Chunk->Next); if (Chunk) free(Chunk); Chunk = nullptr; StackSize = 0; } void *InterpStack::grow(size_t Size) { assert(Size < ChunkSize - sizeof(StackChunk) && "Object too large"); if (!Chunk || sizeof(StackChunk) + Chunk->size() + Size > ChunkSize) { if (Chunk && Chunk->Next) { Chunk = Chunk->Next; } else { StackChunk *Next = new (malloc(ChunkSize)) StackChunk(Chunk); if (Chunk) Chunk->Next = Next; Chunk = Next; } } auto *Object = reinterpret_cast<void *>(Chunk->End); Chunk->End += Size; StackSize += Size; return Object; } void *InterpStack::peek(size_t Size) { assert(Chunk && "Stack is empty!"); StackChunk *Ptr = Chunk; while (Size > Ptr->size()) { Size -= Ptr->size(); Ptr = Ptr->Prev; assert(Ptr && "Offset too large"); } return reinterpret_cast<void *>(Ptr->End - Size); } void InterpStack::shrink(size_t Size) { assert(Chunk && "Chunk is empty!"); while (Size > Chunk->size()) { Size -= Chunk->size(); if (Chunk->Next) { free(Chunk->Next); Chunk->Next = nullptr; } Chunk->End = Chunk->start(); Chunk = Chunk->Prev; assert(Chunk && "Offset too large"); } Chunk->End -= Size; StackSize -= Size; } |