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