//===--- Function.h - Bytecode function 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 "Function.h"

#include "Program.h"

#include "Opcode.h"

#include "clang/AST/Decl.h"

#include "clang/AST/DeclCXX.h"

using namespace clang;

using namespace clang::interp;

Function::Function(Program &P, const FunctionDecl *F, unsigned ArgSize,

                   llvm::SmallVector<PrimType, 8> &&ParamTypes,

                   llvm::DenseMap<unsigned, ParamDescriptor> &&Params)

    : P(P), Loc(F->getBeginLoc()), F(F), ArgSize(ArgSize),

      ParamTypes(std::move(ParamTypes)), Params(std::move(Params)) {}

CodePtr Function::getCodeBegin() const { return Code.data(); }

CodePtr Function::getCodeEnd() const { return Code.data() + Code.size(); }

Function::ParamDescriptor Function::getParamDescriptor(unsigned Offset) const {

  auto It = Params.find(Offset);

  assert(It != Params.end() && "Invalid parameter offset");

  return It->second;

}

SourceInfo Function::getSource(CodePtr PC) const {

  unsigned Offset = PC - getCodeBegin();

  using Elem = std::pair<unsigned, SourceInfo>;

  auto It = std::lower_bound(SrcMap.begin(), SrcMap.end(), Elem{Offset, {}},

                             [](Elem A, Elem B) { return A.first < B.first; });

  if (It == SrcMap.end() || It->first != Offset)

    llvm::report_fatal_error("missing source location");

  return It->second;

}

bool Function::isVirtual() const {

  if (auto *M = dyn_cast<CXXMethodDecl>(F))

    return M->isVirtual();

  return false;

}