| 1 | //===--- InterpState.cpp - Interpreter for the constexpr VM -----*- C++ -*-===// |
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| 2 | // |
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| 3 | // Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions. |
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| 4 | // See https://llvm.org/LICENSE.txt for license information. |
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| 5 | // SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception |
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| 6 | // |
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| 7 | //===----------------------------------------------------------------------===// |
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| 8 | |
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| 9 | #include "InterpState.h" |
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| 10 | #include "InterpFrame.h" |
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| 11 | #include "InterpStack.h" |
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| 12 | #include "Program.h" |
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| 13 | #include "State.h" |
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| 14 | |
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| 15 | using namespace clang; |
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| 16 | using namespace clang::interp; |
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| 17 | |
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| 18 | InterpState::InterpState(State &Parent, Program &P, InterpStack &Stk, |
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| 19 | Context &Ctx, SourceMapper *M) |
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| 20 | : Parent(Parent), M(M), P(P), Stk(Stk), Ctx(Ctx), Current(nullptr) {} |
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| 21 | |
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| 22 | InterpState::~InterpState() { |
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| 23 | while (Current) { |
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| 24 | InterpFrame *Next = Current->Caller; |
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| 25 | delete Current; |
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| 26 | Current = Next; |
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| 27 | } |
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| 28 | |
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| 29 | while (DeadBlocks) { |
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| 30 | DeadBlock *Next = DeadBlocks->Next; |
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| 31 | std::free(ptr: DeadBlocks); |
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| 32 | DeadBlocks = Next; |
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| 33 | } |
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| 34 | } |
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| 35 | |
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| 36 | Frame *InterpState::getCurrentFrame() { |
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| 37 | if (Current && Current->Caller) |
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| 38 | return Current; |
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| 39 | return Parent.getCurrentFrame(); |
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| 40 | } |
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| 41 | |
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| 42 | bool InterpState::reportOverflow(const Expr *E, const llvm::APSInt &Value) { |
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| 43 | QualType Type = E->getType(); |
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| 44 | CCEDiag(E, diag::note_constexpr_overflow) << Value << Type; |
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| 45 | return noteUndefinedBehavior(); |
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| 46 | } |
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| 47 | |
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| 48 | void InterpState::deallocate(Block *B) { |
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| 49 | assert(B); |
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| 50 | const Descriptor *Desc = B->getDescriptor(); |
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| 51 | assert(Desc); |
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| 52 | |
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| 53 | if (B->hasPointers()) { |
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| 54 | size_t Size = B->getSize(); |
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| 55 | |
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| 56 | // Allocate a new block, transferring over pointers. |
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| 57 | char *Memory = |
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| 58 | reinterpret_cast<char *>(std::malloc(size: sizeof(DeadBlock) + Size)); |
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| 59 | auto *D = new (Memory) DeadBlock(DeadBlocks, B); |
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| 60 | |
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| 61 | // Move data and metadata from the old block to the new (dead)block. |
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| 62 | if (Desc->MoveFn) { |
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| 63 | Desc->MoveFn(B, B->data(), D->data(), Desc); |
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| 64 | if (Desc->getMetadataSize() > 0) |
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| 65 | std::memcpy(dest: D->rawData(), src: B->rawData(), n: Desc->getMetadataSize()); |
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| 66 | } |
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| 67 | |
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| 68 | // We moved the contents over to the DeadBlock. |
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| 69 | B->IsInitialized = false; |
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| 70 | } else { |
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| 71 | B->invokeDtor(); |
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| 72 | } |
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| 73 | } |
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| 74 | |
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