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 "Program.h"
11 #include "Opcode.h"
12 #include "clang/AST/Decl.h"
13 #include "clang/AST/DeclCXX.h"
14 
15 using namespace clang;
16 using namespace clang::interp;
17 
18 Function::Function(Program &P, const FunctionDecl *F, unsigned ArgSize,
19                    llvm::SmallVectorImpl<PrimType> &&ParamTypes,
20                    llvm::DenseMap<unsigned, ParamDescriptor> &&Params,
21                    llvm::SmallVectorImpl<unsigned> &&ParamOffsets,
22                    bool HasThisPointer, bool HasRVO)
23     : P(P), Loc(F->getBeginLoc()), F(F), ArgSize(ArgSize),
24       ParamTypes(std::move(ParamTypes)), Params(std::move(Params)),
25       ParamOffsets(std::move(ParamOffsets)), HasThisPointer(HasThisPointer),
26       HasRVO(HasRVO) {}
27 
28 Function::ParamDescriptor Function::getParamDescriptor(unsigned Offset) const {
29   auto It = Params.find(Offset);
30   assert(It != Params.end() && "Invalid parameter offset");
31   return It->second;
32 }
33 
34 SourceInfo Function::getSource(CodePtr PC) const {
35   assert(PC >= getCodeBegin() && "PC does not belong to this function");
36   assert(PC <= getCodeEnd() && "PC Does not belong to this function");
37   assert(hasBody() && "Function has no body");
38   unsigned Offset = PC - getCodeBegin();
39   using Elem = std::pair<unsigned, SourceInfo>;
40   auto It = llvm::lower_bound(SrcMap, Elem{Offset, {}}, llvm::less_first());
41   assert(It != SrcMap.end());
42   return It->second;
43 }
44 
45 bool Function::isVirtual() const {
46   if (auto *M = dyn_cast<CXXMethodDecl>(F))
47     return M->isVirtual();
48   return false;
49 }
50