clang  10.0.0svn
Function.cpp
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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::SmallVector<PrimType, 8> &&ParamTypes,
20  llvm::DenseMap<unsigned, ParamDescriptor> &&Params)
21  : P(P), Loc(F->getBeginLoc()), F(F), ArgSize(ArgSize),
22  ParamTypes(std::move(ParamTypes)), Params(std::move(Params)) {}
23 
24 CodePtr Function::getCodeBegin() const { return Code.data(); }
25 
26 CodePtr Function::getCodeEnd() const { return Code.data() + Code.size(); }
27 
29  auto It = Params.find(Offset);
30  assert(It != Params.end() && "Invalid parameter offset");
31  return It->second;
32 }
33 
35  unsigned Offset = PC - getCodeBegin();
36  using Elem = std::pair<unsigned, SourceInfo>;
37  auto It = std::lower_bound(SrcMap.begin(), SrcMap.end(), Elem{Offset, {}},
38  [](Elem A, Elem B) { return A.first < B.first; });
39  if (It == SrcMap.end() || It->first != Offset)
40  llvm::report_fatal_error("missing source location");
41  return It->second;
42 }
43 
44 bool Function::isVirtual() const {
45  if (auto *M = dyn_cast<CXXMethodDecl>(F))
46  return M->isVirtual();
47  return false;
48 }
Represents a function declaration or definition.
Definition: Decl.h:1784
Pointer into the code segment.
Definition: Source.h:25
StringRef P
std::pair< PrimType, Descriptor * > ParamDescriptor
Definition: Function.h:61
SourceInfo getSource(CodePtr PC) const
Returns the source information at a given PC.
Definition: Function.cpp:34
Describes the statement/declaration an opcode was generated from.
Definition: Source.h:81
ParamDescriptor getParamDescriptor(unsigned Offset) const
Returns a parameter descriptor.
Definition: Function.cpp:28
Definition: Format.h:2392
CodePtr getCodeEnd() const
Returns a pointer to the end of the code.
Definition: Function.cpp:26
CodePtr getCodeBegin() const
Returns a pointer to the start of the code.
Definition: Function.cpp:24
unsigned Offset
Definition: Format.cpp:1809
The program contains and links the bytecode for all functions.
Definition: Program.h:43
bool isVirtual() const
Checks if the function is virtual.
Definition: Function.cpp:44
Dataflow Directional Tag Classes.
Defines the C++ Decl subclasses, other than those for templates (found in DeclTemplate.h) and friends (in DeclFriend.h).