clang  10.0.0svn
Disasm.cpp
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1 //===--- Disasm.cpp - Disassembler for bytecode functions -------*- 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 // Dump method for Function which disassembles the bytecode.
10 //
11 //===----------------------------------------------------------------------===//
12 
13 #include "Function.h"
14 #include "Opcode.h"
15 #include "PrimType.h"
16 #include "Program.h"
17 #include "clang/AST/DeclCXX.h"
18 #include "llvm/Support/Compiler.h"
19 
20 using namespace clang;
21 using namespace clang::interp;
22 
23 LLVM_DUMP_METHOD void Function::dump() const { dump(llvm::errs()); }
24 
25 LLVM_DUMP_METHOD void Function::dump(llvm::raw_ostream &OS) const {
26  if (F) {
27  if (auto *Cons = dyn_cast<CXXConstructorDecl>(F)) {
28  const std::string &Name = Cons->getParent()->getNameAsString();
29  OS << Name << "::" << Name << ":\n";
30  } else {
31  OS << F->getNameAsString() << ":\n";
32  }
33  } else {
34  OS << "<<expr>>\n";
35  }
36 
37  OS << "frame size: " << getFrameSize() << "\n";
38  OS << "arg size: " << getArgSize() << "\n";
39  OS << "rvo: " << hasRVO() << "\n";
40 
41  auto PrintName = [&OS](const char *Name) {
42  OS << Name;
43  for (long I = 0, N = strlen(Name); I < 30 - N; ++I) {
44  OS << ' ';
45  }
46  };
47 
48  for (CodePtr Start = getCodeBegin(), PC = Start; PC != getCodeEnd();) {
49  size_t Addr = PC - Start;
50  auto Op = PC.read<Opcode>();
51  OS << llvm::format("%8d", Addr) << " ";
52  switch (Op) {
53 #define GET_DISASM
54 #include "Opcodes.inc"
55 #undef GET_DISASM
56  }
57  }
58 }
59 
60 LLVM_DUMP_METHOD void Program::dump() const { dump(llvm::errs()); }
61 
62 LLVM_DUMP_METHOD void Program::dump(llvm::raw_ostream &OS) const {
63  for (auto &Func : Funcs) {
64  Func.second->dump();
65  }
66  for (auto &Anon : AnonFuncs) {
67  Anon->dump();
68  }
69 }
Pointer into the code segment.
Definition: Source.h:25
bool hasRVO() const
Checks if the first argument is a RVO pointer.
Definition: Function.h:83
CodePtr getCodeEnd() const
Returns a pointer to the end of the code.
Definition: Function.cpp:26
void dump() const
Dumps the disassembled bytecode to llvm::errs().
Definition: Disasm.cpp:23
CodePtr getCodeBegin() const
Returns a pointer to the start of the code.
Definition: Function.cpp:24
std::string getNameAsString() const
Get a human-readable name for the declaration, even if it is one of the special kinds of names (C++ c...
Definition: Decl.h:291
unsigned getFrameSize() const
Returns the size of the function&#39;s local stack.
Definition: Function.h:64
Dataflow Directional Tag Classes.
Defines the C++ Decl subclasses, other than those for templates (found in DeclTemplate.h) and friends (in DeclFriend.h).
unsigned getArgSize() const
Returns the size of the argument stackx.
Definition: Function.h:66
void dump() const
Dumps the disassembled bytecode to llvm::errs().
Definition: Disasm.cpp:60