clang/lib/AST/Interp/Function.cpp

   1 //===--- Function.h - Bytecode function for the VM --------------*- C++ -*-===//
   2 //
   3 // Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
   4 // See https://llvm.org/LICENSE.txt for license information.
   5 // SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
   6 //
   7 //===----------------------------------------------------------------------===//
   8
   9 #include "Function.h"
  10 #include "Opcode.h"
  11 #include "Program.h"
  12 #include "clang/AST/Decl.h"
  13 #include "clang/AST/DeclCXX.h"
  14 #include "clang/Basic/Builtins.h"
  15
  16 using namespace clang;
  17 using namespace clang::interp;
  18
  19 Function::Function(Program &P, const FunctionDecl *F, unsigned ArgSize,
  20                    llvm::SmallVectorImpl<PrimType> &&ParamTypes,
  21                    llvm::DenseMap<unsigned, ParamDescriptor> &&Params,
  22                    llvm::SmallVectorImpl<unsigned> &&ParamOffsets,
  23                    bool HasThisPointer, bool HasRVO)
  24     : P(P), Loc(F->getBeginLoc()), F(F), ArgSize(ArgSize),
  25       ParamTypes(std::move(ParamTypes)), Params(std::move(Params)),
  26       ParamOffsets(std::move(ParamOffsets)), HasThisPointer(HasThisPointer),
  27       HasRVO(HasRVO), Variadic(F->isVariadic()) {}
  28
  29 Function::ParamDescriptor Function::getParamDescriptor(unsigned Offset) const {
  30   auto It = Params.find(Offset);
  31   assert(It != Params.end() && "Invalid parameter offset");
  32   return It->second;
  33 }
  34
  35 SourceInfo Function::getSource(CodePtr PC) const {
  36   assert(PC >= getCodeBegin() && "PC does not belong to this function");
  37   assert(PC <= getCodeEnd() && "PC Does not belong to this function");
  38   assert(hasBody() && "Function has no body");
  39   unsigned Offset = PC - getCodeBegin();
  40   using Elem = std::pair<unsigned, SourceInfo>;
  41   auto It = llvm::lower_bound(SrcMap, Elem{Offset, {}}, llvm::less_first());
  42   assert(It != SrcMap.end());
  43   return It->second;
  44 }
  45
  46 bool Function::isVirtual() const {
  47   if (const auto *M = dyn_cast<CXXMethodDecl>(F))
  48     return M->isVirtual();
  49   return false;
  50 }
  51
  52 bool Function::needsRuntimeArgPop(const ASTContext &Ctx) const {
  53   if (!isBuiltin())
  54     return false;
  55   return Ctx.BuiltinInfo.hasCustomTypechecking(getBuiltinID());
  56 }