|
| 1 | +//===----------------------------------------------------------------------===// |
| 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 "RegisterContextWasm.h" |
| 10 | +#include "Plugins/Process/gdb-remote/GDBRemoteRegisterContext.h" |
| 11 | +#include "ProcessWasm.h" |
| 12 | +#include "ThreadWasm.h" |
| 13 | +#include "lldb/Utility/LLDBLog.h" |
| 14 | +#include "lldb/Utility/Log.h" |
| 15 | +#include "lldb/Utility/RegisterValue.h" |
| 16 | +#include "llvm/Support/Error.h" |
| 17 | +#include <memory> |
| 18 | + |
| 19 | +using namespace lldb; |
| 20 | +using namespace lldb_private; |
| 21 | +using namespace lldb_private::process_gdb_remote; |
| 22 | +using namespace lldb_private::wasm; |
| 23 | + |
| 24 | +RegisterContextWasm::RegisterContextWasm( |
| 25 | + wasm::ThreadWasm &thread, uint32_t concrete_frame_idx, |
| 26 | + GDBRemoteDynamicRegisterInfoSP reg_info_sp) |
| 27 | + : GDBRemoteRegisterContext(thread, concrete_frame_idx, reg_info_sp, false, |
| 28 | + false) {} |
| 29 | + |
| 30 | +RegisterContextWasm::~RegisterContextWasm() = default; |
| 31 | + |
| 32 | +uint32_t RegisterContextWasm::ConvertRegisterKindToRegisterNumber( |
| 33 | + lldb::RegisterKind kind, uint32_t num) { |
| 34 | + return num; |
| 35 | +} |
| 36 | + |
| 37 | +size_t RegisterContextWasm::GetRegisterCount() { |
| 38 | + // Wasm has no registers. |
| 39 | + return 0; |
| 40 | +} |
| 41 | + |
| 42 | +const RegisterInfo *RegisterContextWasm::GetRegisterInfoAtIndex(size_t reg) { |
| 43 | + uint32_t tag = GetWasmVirtualRegisterTag(reg); |
| 44 | + if (tag == eWasmTagNotAWasmLocation) |
| 45 | + return m_reg_info_sp->GetRegisterInfoAtIndex( |
| 46 | + GetWasmVirtualRegisterIndex(reg)); |
| 47 | + |
| 48 | + auto it = m_register_map.find(reg); |
| 49 | + if (it == m_register_map.end()) { |
| 50 | + WasmVirtualRegisterKinds kind = static_cast<WasmVirtualRegisterKinds>(tag); |
| 51 | + std::tie(it, std::ignore) = m_register_map.insert( |
| 52 | + {reg, std::make_unique<WasmVirtualRegisterInfo>( |
| 53 | + kind, GetWasmVirtualRegisterIndex(reg))}); |
| 54 | + } |
| 55 | + return it->second.get(); |
| 56 | +} |
| 57 | + |
| 58 | +size_t RegisterContextWasm::GetRegisterSetCount() { return 0; } |
| 59 | + |
| 60 | +const RegisterSet *RegisterContextWasm::GetRegisterSet(size_t reg_set) { |
| 61 | + // Wasm has no registers. |
| 62 | + return nullptr; |
| 63 | +} |
| 64 | + |
| 65 | +bool RegisterContextWasm::ReadRegister(const RegisterInfo *reg_info, |
| 66 | + RegisterValue &value) { |
| 67 | + // The only real registers is the PC. |
| 68 | + if (reg_info->name) |
| 69 | + return GDBRemoteRegisterContext::ReadRegister(reg_info, value); |
| 70 | + |
| 71 | + // Read the virtual registers. |
| 72 | + ThreadWasm *thread = static_cast<ThreadWasm *>(&GetThread()); |
| 73 | + ProcessWasm *process = static_cast<ProcessWasm *>(thread-> GetProcess(). get()); |
| 74 | + if (!thread) |
| 75 | + return false; |
| 76 | + |
| 77 | + uint32_t frame_index = m_concrete_frame_idx; |
| 78 | + WasmVirtualRegisterInfo *wasm_reg_info = |
| 79 | + static_cast<WasmVirtualRegisterInfo *>( |
| 80 | + const_cast<RegisterInfo *>(reg_info)); |
| 81 | + |
| 82 | + llvm::Expected<DataBufferSP> maybe_buffer = process->GetWasmVariable( |
| 83 | + wasm_reg_info->kind, frame_index, wasm_reg_info->index); |
| 84 | + if (!maybe_buffer) { |
| 85 | + LLDB_LOG_ERROR(GetLog(LLDBLog::Process), maybe_buffer.takeError(), |
| 86 | + "Failed to read Wasm local: {0}"); |
| 87 | + return false; |
| 88 | + } |
| 89 | + |
| 90 | + DataBufferSP buffer_sp = *maybe_buffer; |
| 91 | + DataExtractor reg_data(buffer_sp, process->GetByteOrder(), |
| 92 | + process->GetAddressByteSize()); |
| 93 | + wasm_reg_info->byte_size = buffer_sp->GetByteSize(); |
| 94 | + wasm_reg_info->encoding = lldb::eEncodingUint; |
| 95 | + |
| 96 | + Status error = value.SetValueFromData( |
| 97 | + *reg_info, reg_data, reg_info->byte_offset, /*partial_data_ok=*/false); |
| 98 | + return error.Success(); |
| 99 | +} |
| 100 | + |
| 101 | +void RegisterContextWasm::InvalidateAllRegisters() {} |
| 102 | + |
| 103 | +bool RegisterContextWasm::WriteRegister(const RegisterInfo *reg_info, |
| 104 | + const RegisterValue &value) { |
| 105 | + // The only real registers is the PC. |
| 106 | + if (reg_info->name) |
| 107 | + return GDBRemoteRegisterContext::WriteRegister(reg_info, value); |
| 108 | + return false; |
| 109 | +} |
0 commit comments