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
9 #include "PdbFPOProgramToDWARFExpression.h"
10 #include "CodeViewRegisterMapping.h"
11
12 #include "lldb/Core/StreamBuffer.h"
13 #include "lldb/Symbol/PostfixExpression.h"
14 #include "lldb/Utility/LLDBAssert.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
ResolveLLDBRegisterNum(llvm::StringRef reg_name,llvm::Triple::ArchType arch_type)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 [®_name](const llvm::EnumEntry<uint16_t> ®ister_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
ResolveFPOProgram(llvm::StringRef program,llvm::StringRef register_name,llvm::Triple::ArchType arch_type,llvm::BumpPtrAllocator & alloc)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
TranslateFPOProgramToDWARFExpression(llvm::StringRef program,llvm::StringRef register_name,llvm::Triple::ArchType arch_type,Stream & stream)91 bool lldb_private::npdb::TranslateFPOProgramToDWARFExpression(
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 }
104