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//===--- EvalEmitter.cpp - Instruction emitter 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 "EvalEmitter.h"
#include "ByteCodeGenError.h"
#include "Context.h"
#include "IntegralAP.h"
#include "Interp.h"
#include "Opcode.h"
#include "clang/AST/DeclCXX.h"
using namespace clang;
using namespace clang::interp;
EvalEmitter::EvalEmitter(Context &Ctx, Program &P, State &Parent,
InterpStack &Stk, APValue &Result)
: Ctx(Ctx), P(P), S(Parent, P, Stk, Ctx, this), EvalResult(&Ctx) {
// Create a dummy frame for the interpreter which does not have locals.
S.Current =
new InterpFrame(S, /*Func=*/nullptr, /*Caller=*/nullptr, CodePtr());
}
EvalEmitter::~EvalEmitter() {
for (auto &[K, V] : Locals) {
Block *B = reinterpret_cast<Block *>(V.get());
if (B->isInitialized())
B->invokeDtor();
}
}
EvaluationResult EvalEmitter::interpretExpr(const Expr *E) {
EvalResult.setSource(E);
if (!this->visitExpr(E))
EvalResult.setInvalid();
return std::move(this->EvalResult);
}
EvaluationResult EvalEmitter::interpretDecl(const VarDecl *VD) {
EvalResult.setSource(VD);
if (!this->visitDecl(VD))
EvalResult.setInvalid();
return std::move(this->EvalResult);
}
void EvalEmitter::emitLabel(LabelTy Label) {
CurrentLabel = Label;
}
EvalEmitter::LabelTy EvalEmitter::getLabel() { return NextLabel++; }
Scope::Local EvalEmitter::createLocal(Descriptor *D) {
// Allocate memory for a local.
auto Memory = std::make_unique<char[]>(sizeof(Block) + D->getAllocSize());
auto *B = new (Memory.get()) Block(D, /*isStatic=*/false);
B->invokeCtor();
// Initialize local variable inline descriptor.
InlineDescriptor &Desc = *reinterpret_cast<InlineDescriptor *>(B->rawData());
Desc.Desc = D;
Desc.Offset = sizeof(InlineDescriptor);
Desc.IsActive = true;
Desc.IsBase = false;
Desc.IsFieldMutable = false;
Desc.IsConst = false;
Desc.IsInitialized = false;
// Register the local.
unsigned Off = Locals.size();
Locals.insert({Off, std::move(Memory)});
return {Off, D};
}
bool EvalEmitter::jumpTrue(const LabelTy &Label) {
if (isActive()) {
if (S.Stk.pop<bool>())
ActiveLabel = Label;
}
return true;
}
bool EvalEmitter::jumpFalse(const LabelTy &Label) {
if (isActive()) {
if (!S.Stk.pop<bool>())
ActiveLabel = Label;
}
return true;
}
bool EvalEmitter::jump(const LabelTy &Label) {
if (isActive())
CurrentLabel = ActiveLabel = Label;
return true;
}
bool EvalEmitter::fallthrough(const LabelTy &Label) {
if (isActive())
ActiveLabel = Label;
CurrentLabel = Label;
return true;
}
template <PrimType OpType> bool EvalEmitter::emitRet(const SourceInfo &Info) {
if (!isActive())
return true;
using T = typename PrimConv<OpType>::T;
EvalResult.setValue(S.Stk.pop<T>().toAPValue());
return true;
}
template <> bool EvalEmitter::emitRet<PT_Ptr>(const SourceInfo &Info) {
if (!isActive())
return true;
EvalResult.setPointer(S.Stk.pop<Pointer>());
return true;
}
template <> bool EvalEmitter::emitRet<PT_FnPtr>(const SourceInfo &Info) {
if (!isActive())
return true;
EvalResult.setFunctionPointer(S.Stk.pop<FunctionPointer>());
return true;
}
bool EvalEmitter::emitRetVoid(const SourceInfo &Info) {
EvalResult.setValid();
return true;
}
bool EvalEmitter::emitRetValue(const SourceInfo &Info) {
const auto &Ptr = S.Stk.pop<Pointer>();
if (std::optional<APValue> APV = Ptr.toRValue(S.getCtx())) {
EvalResult.setValue(*APV);
return true;
}
EvalResult.setInvalid();
return false;
}
bool EvalEmitter::emitGetPtrLocal(uint32_t I, const SourceInfo &Info) {
if (!isActive())
return true;
Block *B = getLocal(I);
S.Stk.push<Pointer>(B, sizeof(InlineDescriptor));
return true;
}
template <PrimType OpType>
bool EvalEmitter::emitGetLocal(uint32_t I, const SourceInfo &Info) {
if (!isActive())
return true;
using T = typename PrimConv<OpType>::T;
Block *B = getLocal(I);
S.Stk.push<T>(*reinterpret_cast<T *>(B->data()));
return true;
}
template <PrimType OpType>
bool EvalEmitter::emitSetLocal(uint32_t I, const SourceInfo &Info) {
if (!isActive())
return true;
using T = typename PrimConv<OpType>::T;
Block *B = getLocal(I);
*reinterpret_cast<T *>(B->data()) = S.Stk.pop<T>();
InlineDescriptor &Desc = *reinterpret_cast<InlineDescriptor *>(B->rawData());
Desc.IsInitialized = true;
return true;
}
bool EvalEmitter::emitDestroy(uint32_t I, const SourceInfo &Info) {
if (!isActive())
return true;
for (auto &Local : Descriptors[I]) {
Block *B = getLocal(Local.Offset);
S.deallocate(B);
}
return true;
}
//===----------------------------------------------------------------------===//
// Opcode evaluators
//===----------------------------------------------------------------------===//
#define GET_EVAL_IMPL
#include "Opcodes.inc"
#undef GET_EVAL_IMPL
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