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492 lines
17 KiB
C++
492 lines
17 KiB
C++
//===--- Descriptor.cpp - Types 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 "Descriptor.h"
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#include "Boolean.h"
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#include "FixedPoint.h"
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#include "Floating.h"
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#include "IntegralAP.h"
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#include "MemberPointer.h"
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#include "Pointer.h"
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#include "PrimType.h"
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#include "Record.h"
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#include "Source.h"
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using namespace clang;
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using namespace clang::interp;
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template <typename T>
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static void ctorTy(Block *, std::byte *Ptr, bool, bool, bool, bool,
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const Descriptor *) {
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new (Ptr) T();
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}
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template <typename T>
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static void dtorTy(Block *, std::byte *Ptr, const Descriptor *) {
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reinterpret_cast<T *>(Ptr)->~T();
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}
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template <typename T>
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static void moveTy(Block *, std::byte *Src, std::byte *Dst,
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const Descriptor *) {
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auto *SrcPtr = reinterpret_cast<T *>(Src);
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auto *DstPtr = reinterpret_cast<T *>(Dst);
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new (DstPtr) T(std::move(*SrcPtr));
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}
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template <typename T>
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static void ctorArrayTy(Block *, std::byte *Ptr, bool, bool, bool, bool,
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const Descriptor *D) {
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new (Ptr) InitMapPtr(std::nullopt);
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Ptr += sizeof(InitMapPtr);
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for (unsigned I = 0, NE = D->getNumElems(); I < NE; ++I) {
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new (&reinterpret_cast<T *>(Ptr)[I]) T();
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}
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}
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template <typename T>
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static void dtorArrayTy(Block *, std::byte *Ptr, const Descriptor *D) {
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InitMapPtr &IMP = *reinterpret_cast<InitMapPtr *>(Ptr);
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if (IMP)
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IMP = std::nullopt;
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Ptr += sizeof(InitMapPtr);
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for (unsigned I = 0, NE = D->getNumElems(); I < NE; ++I) {
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reinterpret_cast<T *>(Ptr)[I].~T();
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}
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}
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template <typename T>
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static void moveArrayTy(Block *, std::byte *Src, std::byte *Dst,
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const Descriptor *D) {
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InitMapPtr &SrcIMP = *reinterpret_cast<InitMapPtr *>(Src);
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if (SrcIMP) {
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// We only ever invoke the moveFunc when moving block contents to a
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// DeadBlock. DeadBlocks don't need InitMaps, so we destroy them here.
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SrcIMP = std::nullopt;
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}
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Src += sizeof(InitMapPtr);
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Dst += sizeof(InitMapPtr);
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for (unsigned I = 0, NE = D->getNumElems(); I < NE; ++I) {
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auto *SrcPtr = &reinterpret_cast<T *>(Src)[I];
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auto *DstPtr = &reinterpret_cast<T *>(Dst)[I];
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new (DstPtr) T(std::move(*SrcPtr));
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}
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}
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static void ctorArrayDesc(Block *B, std::byte *Ptr, bool IsConst,
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bool IsMutable, bool IsActive, bool InUnion,
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const Descriptor *D) {
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const unsigned NumElems = D->getNumElems();
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const unsigned ElemSize =
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D->ElemDesc->getAllocSize() + sizeof(InlineDescriptor);
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unsigned ElemOffset = 0;
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for (unsigned I = 0; I < NumElems; ++I, ElemOffset += ElemSize) {
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auto *ElemPtr = Ptr + ElemOffset;
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auto *Desc = reinterpret_cast<InlineDescriptor *>(ElemPtr);
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auto *ElemLoc = reinterpret_cast<std::byte *>(Desc + 1);
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auto *SD = D->ElemDesc;
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Desc->Offset = ElemOffset + sizeof(InlineDescriptor);
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Desc->Desc = SD;
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Desc->IsInitialized = true;
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Desc->IsBase = false;
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Desc->IsActive = IsActive;
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Desc->IsConst = IsConst || D->IsConst;
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Desc->IsFieldMutable = IsMutable || D->IsMutable;
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Desc->InUnion = InUnion;
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Desc->IsArrayElement = true;
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if (auto Fn = D->ElemDesc->CtorFn)
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Fn(B, ElemLoc, Desc->IsConst, Desc->IsFieldMutable, IsActive,
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Desc->InUnion || SD->isUnion(), D->ElemDesc);
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}
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}
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static void dtorArrayDesc(Block *B, std::byte *Ptr, const Descriptor *D) {
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const unsigned NumElems = D->getNumElems();
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const unsigned ElemSize =
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D->ElemDesc->getAllocSize() + sizeof(InlineDescriptor);
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unsigned ElemOffset = 0;
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for (unsigned I = 0; I < NumElems; ++I, ElemOffset += ElemSize) {
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auto *ElemPtr = Ptr + ElemOffset;
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auto *Desc = reinterpret_cast<InlineDescriptor *>(ElemPtr);
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auto *ElemLoc = reinterpret_cast<std::byte *>(Desc + 1);
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if (auto Fn = D->ElemDesc->DtorFn)
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Fn(B, ElemLoc, D->ElemDesc);
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}
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}
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static void moveArrayDesc(Block *B, std::byte *Src, std::byte *Dst,
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const Descriptor *D) {
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const unsigned NumElems = D->getNumElems();
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const unsigned ElemSize =
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D->ElemDesc->getAllocSize() + sizeof(InlineDescriptor);
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unsigned ElemOffset = 0;
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for (unsigned I = 0; I < NumElems; ++I, ElemOffset += ElemSize) {
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auto *SrcPtr = Src + ElemOffset;
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auto *DstPtr = Dst + ElemOffset;
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auto *SrcDesc = reinterpret_cast<InlineDescriptor *>(SrcPtr);
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auto *SrcElemLoc = reinterpret_cast<std::byte *>(SrcDesc + 1);
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auto *DstDesc = reinterpret_cast<InlineDescriptor *>(DstPtr);
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auto *DstElemLoc = reinterpret_cast<std::byte *>(DstDesc + 1);
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*DstDesc = *SrcDesc;
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if (auto Fn = D->ElemDesc->MoveFn)
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Fn(B, SrcElemLoc, DstElemLoc, D->ElemDesc);
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}
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}
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static void initField(Block *B, std::byte *Ptr, bool IsConst, bool IsMutable,
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bool IsActive, bool IsUnionField, bool InUnion,
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const Descriptor *D, unsigned FieldOffset) {
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auto *Desc = reinterpret_cast<InlineDescriptor *>(Ptr + FieldOffset) - 1;
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Desc->Offset = FieldOffset;
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Desc->Desc = D;
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Desc->IsInitialized = D->IsArray;
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Desc->IsBase = false;
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Desc->IsActive = IsActive && !IsUnionField;
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Desc->InUnion = InUnion;
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Desc->IsConst = IsConst || D->IsConst;
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Desc->IsFieldMutable = IsMutable || D->IsMutable;
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if (auto Fn = D->CtorFn)
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Fn(B, Ptr + FieldOffset, Desc->IsConst, Desc->IsFieldMutable,
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Desc->IsActive, InUnion || D->isUnion(), D);
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}
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static void initBase(Block *B, std::byte *Ptr, bool IsConst, bool IsMutable,
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bool IsActive, bool InUnion, const Descriptor *D,
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unsigned FieldOffset, bool IsVirtualBase) {
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assert(D);
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assert(D->ElemRecord);
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assert(!D->ElemRecord->isUnion()); // Unions cannot be base classes.
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auto *Desc = reinterpret_cast<InlineDescriptor *>(Ptr + FieldOffset) - 1;
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Desc->Offset = FieldOffset;
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Desc->Desc = D;
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Desc->IsInitialized = D->IsArray;
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Desc->IsBase = true;
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Desc->IsVirtualBase = IsVirtualBase;
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Desc->IsActive = IsActive && !InUnion;
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Desc->IsConst = IsConst || D->IsConst;
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Desc->IsFieldMutable = IsMutable || D->IsMutable;
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Desc->InUnion = InUnion;
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for (const auto &V : D->ElemRecord->bases())
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initBase(B, Ptr + FieldOffset, IsConst, IsMutable, IsActive, InUnion,
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V.Desc, V.Offset, false);
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for (const auto &F : D->ElemRecord->fields())
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initField(B, Ptr + FieldOffset, IsConst, IsMutable, IsActive, InUnion,
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InUnion, F.Desc, F.Offset);
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}
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static void ctorRecord(Block *B, std::byte *Ptr, bool IsConst, bool IsMutable,
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bool IsActive, bool InUnion, const Descriptor *D) {
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for (const auto &V : D->ElemRecord->bases())
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initBase(B, Ptr, IsConst, IsMutable, IsActive, InUnion, V.Desc, V.Offset,
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false);
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for (const auto &F : D->ElemRecord->fields()) {
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bool IsUnionField = D->isUnion();
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initField(B, Ptr, IsConst, IsMutable, IsActive, IsUnionField,
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InUnion || IsUnionField, F.Desc, F.Offset);
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}
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for (const auto &V : D->ElemRecord->virtual_bases())
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initBase(B, Ptr, IsConst, IsMutable, IsActive, InUnion, V.Desc, V.Offset,
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true);
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}
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static void destroyField(Block *B, std::byte *Ptr, const Descriptor *D,
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unsigned FieldOffset) {
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if (auto Fn = D->DtorFn)
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Fn(B, Ptr + FieldOffset, D);
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}
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static void destroyBase(Block *B, std::byte *Ptr, const Descriptor *D,
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unsigned FieldOffset) {
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assert(D);
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assert(D->ElemRecord);
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for (const auto &V : D->ElemRecord->bases())
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destroyBase(B, Ptr + FieldOffset, V.Desc, V.Offset);
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for (const auto &F : D->ElemRecord->fields())
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destroyField(B, Ptr + FieldOffset, F.Desc, F.Offset);
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}
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static void dtorRecord(Block *B, std::byte *Ptr, const Descriptor *D) {
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for (const auto &F : D->ElemRecord->bases())
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destroyBase(B, Ptr, F.Desc, F.Offset);
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for (const auto &F : D->ElemRecord->fields())
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destroyField(B, Ptr, F.Desc, F.Offset);
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for (const auto &F : D->ElemRecord->virtual_bases())
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destroyBase(B, Ptr, F.Desc, F.Offset);
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}
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static void moveRecord(Block *B, std::byte *Src, std::byte *Dst,
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const Descriptor *D) {
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assert(D);
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assert(D->ElemRecord);
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// FIXME: Code duplication.
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for (const auto &F : D->ElemRecord->fields()) {
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auto FieldOffset = F.Offset;
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const auto *SrcDesc =
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reinterpret_cast<const InlineDescriptor *>(Src + FieldOffset) - 1;
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auto *DestDesc =
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reinterpret_cast<InlineDescriptor *>(Dst + FieldOffset) - 1;
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std::memcpy(DestDesc, SrcDesc, sizeof(InlineDescriptor));
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if (auto Fn = F.Desc->MoveFn)
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Fn(B, Src + FieldOffset, Dst + FieldOffset, F.Desc);
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}
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for (const auto &Base : D->ElemRecord->bases()) {
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auto BaseOffset = Base.Offset;
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const auto *SrcDesc =
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reinterpret_cast<const InlineDescriptor *>(Src + BaseOffset) - 1;
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auto *DestDesc = reinterpret_cast<InlineDescriptor *>(Dst + BaseOffset) - 1;
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std::memcpy(DestDesc, SrcDesc, sizeof(InlineDescriptor));
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if (auto Fn = Base.Desc->MoveFn)
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Fn(B, Src + BaseOffset, Dst + BaseOffset, Base.Desc);
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}
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for (const auto &VBase : D->ElemRecord->virtual_bases()) {
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auto VBaseOffset = VBase.Offset;
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const auto *SrcDesc =
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reinterpret_cast<const InlineDescriptor *>(Src + VBaseOffset) - 1;
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auto *DestDesc =
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reinterpret_cast<InlineDescriptor *>(Dst + VBaseOffset) - 1;
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std::memcpy(DestDesc, SrcDesc, sizeof(InlineDescriptor));
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}
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}
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static BlockCtorFn getCtorPrim(PrimType Type) {
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// Floating types are special. They are primitives, but need their
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// constructor called.
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if (Type == PT_Float)
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return ctorTy<PrimConv<PT_Float>::T>;
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if (Type == PT_IntAP)
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return ctorTy<PrimConv<PT_IntAP>::T>;
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if (Type == PT_IntAPS)
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return ctorTy<PrimConv<PT_IntAPS>::T>;
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if (Type == PT_MemberPtr)
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return ctorTy<PrimConv<PT_MemberPtr>::T>;
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COMPOSITE_TYPE_SWITCH(Type, return ctorTy<T>, return nullptr);
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}
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static BlockDtorFn getDtorPrim(PrimType Type) {
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// Floating types are special. They are primitives, but need their
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// destructor called, since they might allocate memory.
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if (Type == PT_Float)
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return dtorTy<PrimConv<PT_Float>::T>;
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if (Type == PT_IntAP)
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return dtorTy<PrimConv<PT_IntAP>::T>;
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if (Type == PT_IntAPS)
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return dtorTy<PrimConv<PT_IntAPS>::T>;
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if (Type == PT_MemberPtr)
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return dtorTy<PrimConv<PT_MemberPtr>::T>;
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COMPOSITE_TYPE_SWITCH(Type, return dtorTy<T>, return nullptr);
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}
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static BlockMoveFn getMovePrim(PrimType Type) {
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if (Type == PT_Float)
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return moveTy<PrimConv<PT_Float>::T>;
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if (Type == PT_IntAP)
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return moveTy<PrimConv<PT_IntAP>::T>;
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if (Type == PT_IntAPS)
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return moveTy<PrimConv<PT_IntAPS>::T>;
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if (Type == PT_MemberPtr)
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return moveTy<PrimConv<PT_MemberPtr>::T>;
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COMPOSITE_TYPE_SWITCH(Type, return moveTy<T>, return nullptr);
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}
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static BlockCtorFn getCtorArrayPrim(PrimType Type) {
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TYPE_SWITCH(Type, return ctorArrayTy<T>);
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llvm_unreachable("unknown Expr");
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}
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static BlockDtorFn getDtorArrayPrim(PrimType Type) {
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TYPE_SWITCH(Type, return dtorArrayTy<T>);
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llvm_unreachable("unknown Expr");
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}
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static BlockMoveFn getMoveArrayPrim(PrimType Type) {
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TYPE_SWITCH(Type, return moveArrayTy<T>);
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llvm_unreachable("unknown Expr");
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}
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/// Primitives.
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Descriptor::Descriptor(const DeclTy &D, PrimType Type, MetadataSize MD,
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bool IsConst, bool IsTemporary, bool IsMutable)
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: Source(D), ElemSize(primSize(Type)), Size(ElemSize),
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MDSize(MD.value_or(0)), AllocSize(align(Size + MDSize)), PrimT(Type),
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IsConst(IsConst), IsMutable(IsMutable), IsTemporary(IsTemporary),
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CtorFn(getCtorPrim(Type)), DtorFn(getDtorPrim(Type)),
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MoveFn(getMovePrim(Type)) {
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assert(AllocSize >= Size);
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assert(Source && "Missing source");
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}
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/// Primitive arrays.
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Descriptor::Descriptor(const DeclTy &D, PrimType Type, MetadataSize MD,
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size_t NumElems, bool IsConst, bool IsTemporary,
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bool IsMutable)
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: Source(D), ElemSize(primSize(Type)), Size(ElemSize * NumElems),
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MDSize(MD.value_or(0)),
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AllocSize(align(MDSize) + align(Size) + sizeof(InitMapPtr)), PrimT(Type),
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IsConst(IsConst), IsMutable(IsMutable), IsTemporary(IsTemporary),
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IsArray(true), CtorFn(getCtorArrayPrim(Type)),
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DtorFn(getDtorArrayPrim(Type)), MoveFn(getMoveArrayPrim(Type)) {
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assert(Source && "Missing source");
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assert(NumElems <= (MaxArrayElemBytes / ElemSize));
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}
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/// Primitive unknown-size arrays.
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Descriptor::Descriptor(const DeclTy &D, PrimType Type, MetadataSize MD,
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bool IsTemporary, UnknownSize)
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: Source(D), ElemSize(primSize(Type)), Size(UnknownSizeMark),
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MDSize(MD.value_or(0)),
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AllocSize(MDSize + sizeof(InitMapPtr) + alignof(void *)), IsConst(true),
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IsMutable(false), IsTemporary(IsTemporary), IsArray(true),
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CtorFn(getCtorArrayPrim(Type)), DtorFn(getDtorArrayPrim(Type)),
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MoveFn(getMoveArrayPrim(Type)) {
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assert(Source && "Missing source");
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}
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/// Arrays of composite elements.
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Descriptor::Descriptor(const DeclTy &D, const Type *SourceTy,
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const Descriptor *Elem, MetadataSize MD,
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unsigned NumElems, bool IsConst, bool IsTemporary,
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bool IsMutable)
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: Source(D), SourceType(SourceTy),
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ElemSize(Elem->getAllocSize() + sizeof(InlineDescriptor)),
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Size(ElemSize * NumElems), MDSize(MD.value_or(0)),
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AllocSize(std::max<size_t>(alignof(void *), Size) + MDSize),
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ElemDesc(Elem), IsConst(IsConst), IsMutable(IsMutable),
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IsTemporary(IsTemporary), IsArray(true), CtorFn(ctorArrayDesc),
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DtorFn(dtorArrayDesc), MoveFn(moveArrayDesc) {
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assert(Source && "Missing source");
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}
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/// Unknown-size arrays of composite elements.
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Descriptor::Descriptor(const DeclTy &D, const Descriptor *Elem, MetadataSize MD,
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bool IsTemporary, UnknownSize)
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: Source(D), ElemSize(Elem->getAllocSize() + sizeof(InlineDescriptor)),
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Size(UnknownSizeMark), MDSize(MD.value_or(0)),
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AllocSize(MDSize + alignof(void *)), ElemDesc(Elem), IsConst(true),
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IsMutable(false), IsTemporary(IsTemporary), IsArray(true),
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CtorFn(ctorArrayDesc), DtorFn(dtorArrayDesc), MoveFn(moveArrayDesc) {
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assert(Source && "Missing source");
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}
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/// Composite records.
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Descriptor::Descriptor(const DeclTy &D, const Record *R, MetadataSize MD,
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bool IsConst, bool IsTemporary, bool IsMutable)
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: Source(D), ElemSize(std::max<size_t>(alignof(void *), R->getFullSize())),
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Size(ElemSize), MDSize(MD.value_or(0)), AllocSize(Size + MDSize),
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ElemRecord(R), IsConst(IsConst), IsMutable(IsMutable),
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IsTemporary(IsTemporary), CtorFn(ctorRecord), DtorFn(dtorRecord),
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MoveFn(moveRecord) {
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assert(Source && "Missing source");
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}
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/// Dummy.
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Descriptor::Descriptor(const DeclTy &D, MetadataSize MD)
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: Source(D), ElemSize(1), Size(1), MDSize(MD.value_or(0)),
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AllocSize(MDSize), ElemRecord(nullptr), IsConst(true), IsMutable(false),
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IsTemporary(false), IsDummy(true) {
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assert(Source && "Missing source");
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}
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QualType Descriptor::getType() const {
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if (SourceType)
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return QualType(SourceType, 0);
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if (const auto *D = asValueDecl())
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return D->getType();
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if (const auto *T = dyn_cast_if_present<TypeDecl>(asDecl()))
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return QualType(T->getTypeForDecl(), 0);
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// The Source sometimes has a different type than the once
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// we really save. Try to consult the Record first.
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if (isRecord())
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return QualType(ElemRecord->getDecl()->getTypeForDecl(), 0);
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if (const auto *E = asExpr())
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return E->getType();
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llvm_unreachable("Invalid descriptor type");
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}
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QualType Descriptor::getElemQualType() const {
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assert(isArray());
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QualType T = getType();
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if (T->isPointerOrReferenceType())
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T = T->getPointeeType();
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if (const auto *AT = T->getAsArrayTypeUnsafe()) {
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// For primitive arrays, we don't save a QualType at all,
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// just a PrimType. Try to figure out the QualType here.
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if (isPrimitiveArray()) {
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while (T->isArrayType())
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T = T->getAsArrayTypeUnsafe()->getElementType();
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return T;
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}
|
|
return AT->getElementType();
|
|
}
|
|
if (const auto *CT = T->getAs<ComplexType>())
|
|
return CT->getElementType();
|
|
if (const auto *CT = T->getAs<VectorType>())
|
|
return CT->getElementType();
|
|
|
|
return T;
|
|
}
|
|
|
|
SourceLocation Descriptor::getLocation() const {
|
|
if (auto *D = dyn_cast<const Decl *>(Source))
|
|
return D->getLocation();
|
|
if (auto *E = dyn_cast<const Expr *>(Source))
|
|
return E->getExprLoc();
|
|
llvm_unreachable("Invalid descriptor type");
|
|
}
|
|
|
|
SourceInfo Descriptor::getLoc() const {
|
|
if (const auto *D = dyn_cast<const Decl *>(Source))
|
|
return SourceInfo(D);
|
|
if (const auto *E = dyn_cast<const Expr *>(Source))
|
|
return SourceInfo(E);
|
|
llvm_unreachable("Invalid descriptor type");
|
|
}
|
|
|
|
bool Descriptor::isUnion() const { return isRecord() && ElemRecord->isUnion(); }
|
|
|
|
InitMap::InitMap(unsigned N)
|
|
: UninitFields(N), Data(std::make_unique<T[]>(numFields(N))) {
|
|
std::fill_n(data(), numFields(N), 0);
|
|
}
|
|
|
|
bool InitMap::initializeElement(unsigned I) {
|
|
unsigned Bucket = I / PER_FIELD;
|
|
T Mask = T(1) << (I % PER_FIELD);
|
|
if (!(data()[Bucket] & Mask)) {
|
|
data()[Bucket] |= Mask;
|
|
UninitFields -= 1;
|
|
}
|
|
return UninitFields == 0;
|
|
}
|
|
|
|
bool InitMap::isElementInitialized(unsigned I) const {
|
|
unsigned Bucket = I / PER_FIELD;
|
|
return data()[Bucket] & (T(1) << (I % PER_FIELD));
|
|
}
|