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//===--- 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) const {
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;
}
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