104 lines · cpp
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-exception6//7//===----------------------------------------------------------------------===//8 9#include "PdbFPOProgramToDWARFExpression.h"10#include "CodeViewRegisterMapping.h"11 12#include "lldb/Symbol/PostfixExpression.h"13#include "lldb/Utility/LLDBAssert.h"14#include "lldb/Utility/Stream.h"15#include "llvm/ADT/DenseMap.h"16 17#include "llvm/ADT/StringExtras.h"18#include "llvm/DebugInfo/CodeView/CodeView.h"19#include "llvm/DebugInfo/CodeView/EnumTables.h"20#include "llvm/Support/ScopedPrinter.h"21 22using namespace lldb;23using namespace lldb_private;24using namespace lldb_private::postfix;25 26static uint32_t ResolveLLDBRegisterNum(llvm::StringRef reg_name, llvm::Triple::ArchType arch_type) {27 // lookup register name to get lldb register number28 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_insensitive(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 54static 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 independent63 // 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 further84 return it->second;85 }86 }87 88 return nullptr;89}90 91bool 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