74 lines
2.1 KiB
C++
74 lines
2.1 KiB
C++
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//===--- InterpState.cpp - Interpreter for the constexpr VM -----*- 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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#include "InterpState.h"
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#include "InterpFrame.h"
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#include "InterpStack.h"
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#include "Program.h"
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#include "State.h"
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using namespace clang;
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using namespace clang::interp;
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InterpState::InterpState(State &Parent, Program &P, InterpStack &Stk,
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Context &Ctx, SourceMapper *M)
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: Parent(Parent), M(M), P(P), Stk(Stk), Ctx(Ctx), Current(nullptr) {}
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InterpState::~InterpState() {
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while (Current) {
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InterpFrame *Next = Current->Caller;
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delete Current;
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Current = Next;
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}
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while (DeadBlocks) {
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DeadBlock *Next = DeadBlocks->Next;
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std::free(DeadBlocks);
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DeadBlocks = Next;
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}
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}
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Frame *InterpState::getCurrentFrame() {
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if (Current && Current->Caller)
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return Current;
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return Parent.getCurrentFrame();
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}
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bool InterpState::reportOverflow(const Expr *E, const llvm::APSInt &Value) {
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QualType Type = E->getType();
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CCEDiag(E, diag::note_constexpr_overflow) << Value << Type;
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return noteUndefinedBehavior();
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}
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void InterpState::deallocate(Block *B) {
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assert(B);
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const Descriptor *Desc = B->getDescriptor();
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assert(Desc);
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if (B->hasPointers()) {
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size_t Size = B->getSize();
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// Allocate a new block, transferring over pointers.
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char *Memory =
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reinterpret_cast<char *>(std::malloc(sizeof(DeadBlock) + Size));
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auto *D = new (Memory) DeadBlock(DeadBlocks, B);
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// Move data and metadata from the old block to the new (dead)block.
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if (Desc->MoveFn) {
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Desc->MoveFn(B, B->data(), D->data(), Desc);
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if (Desc->getMetadataSize() > 0)
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std::memcpy(D->rawData(), B->rawData(), Desc->getMetadataSize());
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}
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// We moved the contents over to the DeadBlock.
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B->IsInitialized = false;
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} else {
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B->invokeDtor();
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}
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}
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