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104 lines
3.4 KiB
104 lines
3.4 KiB
4 months ago
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//===-- PdbFPOProgramToDWARFExpression.cpp --------------------------------===//
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//
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// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
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// See https://llvm.org/LICENSE.txt for license information.
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// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
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//
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//===----------------------------------------------------------------------===//
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#include "PdbFPOProgramToDWARFExpression.h"
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#include "CodeViewRegisterMapping.h"
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#include "lldb/Core/StreamBuffer.h"
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#include "lldb/Symbol/PostfixExpression.h"
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#include "lldb/Utility/LLDBAssert.h"
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#include "lldb/Utility/Stream.h"
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#include "llvm/ADT/DenseMap.h"
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#include "llvm/ADT/StringExtras.h"
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#include "llvm/DebugInfo/CodeView/CodeView.h"
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#include "llvm/DebugInfo/CodeView/EnumTables.h"
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using namespace lldb;
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using namespace lldb_private;
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using namespace lldb_private::postfix;
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static uint32_t ResolveLLDBRegisterNum(llvm::StringRef reg_name, llvm::Triple::ArchType arch_type) {
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// lookup register name to get lldb register number
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llvm::codeview::CPUType cpu_type;
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switch (arch_type) {
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case llvm::Triple::ArchType::aarch64:
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cpu_type = llvm::codeview::CPUType::ARM64;
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break;
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default:
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cpu_type = llvm::codeview::CPUType::X64;
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break;
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}
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llvm::ArrayRef<llvm::EnumEntry<uint16_t>> register_names =
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llvm::codeview::getRegisterNames(cpu_type);
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auto it = llvm::find_if(
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register_names,
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[®_name](const llvm::EnumEntry<uint16_t> ®ister_entry) {
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return reg_name.compare_lower(register_entry.Name) == 0;
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});
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if (it == register_names.end())
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return LLDB_INVALID_REGNUM;
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auto reg_id = static_cast<llvm::codeview::RegisterId>(it->Value);
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return npdb::GetLLDBRegisterNumber(arch_type, reg_id);
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}
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static Node *ResolveFPOProgram(llvm::StringRef program,
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llvm::StringRef register_name,
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llvm::Triple::ArchType arch_type,
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llvm::BumpPtrAllocator &alloc) {
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std::vector<std::pair<llvm::StringRef, Node *>> parsed =
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postfix::ParseFPOProgram(program, alloc);
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for (auto it = parsed.begin(), end = parsed.end(); it != end; ++it) {
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// Emplace valid dependent subtrees to make target assignment independent
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// from predecessors. Resolve all other SymbolNodes as registers.
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bool success =
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ResolveSymbols(it->second, [&](SymbolNode &symbol) -> Node * {
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for (const auto &pair : llvm::make_range(parsed.begin(), it)) {
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if (pair.first == symbol.GetName())
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return pair.second;
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}
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uint32_t reg_num =
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ResolveLLDBRegisterNum(symbol.GetName().drop_front(1), arch_type);
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if (reg_num == LLDB_INVALID_REGNUM)
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return nullptr;
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return MakeNode<RegisterNode>(alloc, reg_num);
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});
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if (!success)
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return nullptr;
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if (it->first == register_name) {
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// found target assignment program - no need to parse further
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return it->second;
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}
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}
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return nullptr;
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}
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bool lldb_private::npdb::TranslateFPOProgramToDWARFExpression(
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llvm::StringRef program, llvm::StringRef register_name,
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llvm::Triple::ArchType arch_type, Stream &stream) {
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llvm::BumpPtrAllocator node_alloc;
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Node *target_program =
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ResolveFPOProgram(program, register_name, arch_type, node_alloc);
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if (target_program == nullptr) {
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return false;
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}
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ToDWARF(*target_program, stream);
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return true;
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}
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