LLDB  mainline
PdbFPOProgramToDWARFExpression.cpp
Go to the documentation of this file.
1 //===-- PdbFPOProgramToDWARFExpression.cpp --------------------------------===//
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 
11 
12 #include "lldb/Core/StreamBuffer.h"
15 #include "lldb/Utility/Stream.h"
16 #include "llvm/ADT/DenseMap.h"
17 
18 #include "llvm/ADT/StringExtras.h"
19 #include "llvm/DebugInfo/CodeView/CodeView.h"
20 #include "llvm/DebugInfo/CodeView/EnumTables.h"
21 
22 using namespace lldb;
23 using namespace lldb_private;
24 using namespace lldb_private::postfix;
25 
26 static uint32_t ResolveLLDBRegisterNum(llvm::StringRef reg_name, llvm::Triple::ArchType arch_type) {
27  // lookup register name to get lldb register number
28  llvm::codeview::CPUType cpu_type;
29  switch (arch_type) {
30  case llvm::Triple::ArchType::aarch64:
31  cpu_type = llvm::codeview::CPUType::ARM64;
32  break;
33 
34  default:
35  cpu_type = llvm::codeview::CPUType::X64;
36  break;
37  }
38 
39  llvm::ArrayRef<llvm::EnumEntry<uint16_t>> register_names =
40  llvm::codeview::getRegisterNames(cpu_type);
41  auto it = llvm::find_if(
42  register_names,
43  [&reg_name](const llvm::EnumEntry<uint16_t> &register_entry) {
44  return reg_name.compare_lower(register_entry.Name) == 0;
45  });
46 
47  if (it == register_names.end())
48  return LLDB_INVALID_REGNUM;
49 
50  auto reg_id = static_cast<llvm::codeview::RegisterId>(it->Value);
51  return npdb::GetLLDBRegisterNumber(arch_type, reg_id);
52 }
53 
54 static Node *ResolveFPOProgram(llvm::StringRef program,
55  llvm::StringRef register_name,
56  llvm::Triple::ArchType arch_type,
57  llvm::BumpPtrAllocator &alloc) {
58  std::vector<std::pair<llvm::StringRef, Node *>> parsed =
59  postfix::ParseFPOProgram(program, alloc);
60 
61  for (auto it = parsed.begin(), end = parsed.end(); it != end; ++it) {
62  // Emplace valid dependent subtrees to make target assignment independent
63  // from predecessors. Resolve all other SymbolNodes as registers.
64  bool success =
65  ResolveSymbols(it->second, [&](SymbolNode &symbol) -> Node * {
66  for (const auto &pair : llvm::make_range(parsed.begin(), it)) {
67  if (pair.first == symbol.GetName())
68  return pair.second;
69  }
70 
71  uint32_t reg_num =
72  ResolveLLDBRegisterNum(symbol.GetName().drop_front(1), arch_type);
73 
74  if (reg_num == LLDB_INVALID_REGNUM)
75  return nullptr;
76 
77  return MakeNode<RegisterNode>(alloc, reg_num);
78  });
79  if (!success)
80  return nullptr;
81 
82  if (it->first == register_name) {
83  // found target assignment program - no need to parse further
84  return it->second;
85  }
86  }
87 
88  return nullptr;
89 }
90 
92  llvm::StringRef program, llvm::StringRef register_name,
93  llvm::Triple::ArchType arch_type, Stream &stream) {
94  llvm::BumpPtrAllocator node_alloc;
95  Node *target_program =
96  ResolveFPOProgram(program, register_name, arch_type, node_alloc);
97  if (target_program == nullptr) {
98  return false;
99  }
100 
101  ToDWARF(*target_program, stream);
102  return true;
103 }
void ToDWARF(Node &node, Stream &stream)
Serialize the given expression tree as DWARF.
A class that represents a running process on the host machine.
A stream class that can stream formatted output to a file.
Definition: Stream.h:28
static Node * ResolveFPOProgram(llvm::StringRef program, llvm::StringRef register_name, llvm::Triple::ArchType arch_type, llvm::BumpPtrAllocator &alloc)
uint32_t GetLLDBRegisterNumber(llvm::Triple::ArchType arch_type, llvm::codeview::RegisterId register_id)
static uint32_t ResolveLLDBRegisterNum(llvm::StringRef reg_name, llvm::Triple::ArchType arch_type)
A node representing a symbolic reference to a named entity.
bool ResolveSymbols(Node *&node, llvm::function_ref< Node *(SymbolNode &symbol)> replacer)
A utility function for "resolving" SymbolNodes.
The base class for all nodes in the parsed postfix tree.
std::vector< std::pair< llvm::StringRef, Node * > > ParseFPOProgram(llvm::StringRef prog, llvm::BumpPtrAllocator &alloc)
Definition: SBAddress.h:15
bool TranslateFPOProgramToDWARFExpression(llvm::StringRef program, llvm::StringRef register_name, llvm::Triple::ArchType arch_type, lldb_private::Stream &stream)
#define LLDB_INVALID_REGNUM
Definition: lldb-defines.h:90