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//===----------------------------------------------------------------------===//
//
// 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 "ProcessWasm.h"
#include "ThreadWasm.h"
#include "lldb/Core/Module.h"
#include "lldb/Core/PluginManager.h"
#include "lldb/Core/Value.h"
#include "lldb/Utility/DataBufferHeap.h"
#include "lldb/Target/UnixSignals.h"
using namespace lldb;
using namespace lldb_private;
using namespace lldb_private::process_gdb_remote;
using namespace lldb_private::wasm;
LLDB_PLUGIN_DEFINE(ProcessWasm)
ProcessWasm::ProcessWasm(lldb::TargetSP target_sp, ListenerSP listener_sp)
: ProcessGDBRemote(target_sp, listener_sp) {
assert(target_sp);
// Wasm doesn't have any Unix-like signals as a platform concept, but pretend
// like it does to appease LLDB.
m_unix_signals_sp = UnixSignals::Create(target_sp->GetArchitecture());
}
void ProcessWasm::Initialize() {
static llvm::once_flag g_once_flag;
llvm::call_once(g_once_flag, []() {
PluginManager::RegisterPlugin(GetPluginNameStatic(),
GetPluginDescriptionStatic(), CreateInstance,
DebuggerInitialize);
});
}
void ProcessWasm::DebuggerInitialize(Debugger &debugger) {
ProcessGDBRemote::DebuggerInitialize(debugger);
}
llvm::StringRef ProcessWasm::GetPluginName() { return GetPluginNameStatic(); }
llvm::StringRef ProcessWasm::GetPluginNameStatic() { return "wasm"; }
llvm::StringRef ProcessWasm::GetPluginDescriptionStatic() {
return "GDB Remote protocol based WebAssembly debugging plug-in.";
}
void ProcessWasm::Terminate() {
PluginManager::UnregisterPlugin(ProcessWasm::CreateInstance);
}
lldb::ProcessSP ProcessWasm::CreateInstance(lldb::TargetSP target_sp,
ListenerSP listener_sp,
const FileSpec *crash_file_path,
bool can_connect) {
if (crash_file_path == nullptr)
return std::make_shared<ProcessWasm>(target_sp, listener_sp);
return {};
}
bool ProcessWasm::CanDebug(lldb::TargetSP target_sp,
bool plugin_specified_by_name) {
if (plugin_specified_by_name)
return true;
if (Module *exe_module = target_sp->GetExecutableModulePointer()) {
if (ObjectFile *exe_objfile = exe_module->GetObjectFile())
return exe_objfile->GetArchitecture().GetMachine() ==
llvm::Triple::wasm32;
}
// However, if there is no wasm module, we return false, otherwise,
// we might use ProcessWasm to attach gdb remote.
return false;
}
std::shared_ptr<ThreadGDBRemote> ProcessWasm::CreateThread(lldb::tid_t tid) {
return std::make_shared<ThreadWasm>(*this, tid);
}
size_t ProcessWasm::ReadMemory(lldb::addr_t vm_addr, void *buf, size_t size,
Status &error) {
wasm_addr_t wasm_addr(vm_addr);
switch (wasm_addr.GetType()) {
case WasmAddressType::Memory:
case WasmAddressType::Object:
return ProcessGDBRemote::ReadMemory(vm_addr, buf, size, error);
case WasmAddressType::Invalid:
error.FromErrorStringWithFormat(
"Wasm read failed for invalid address 0x%" PRIx64, vm_addr);
return 0;
}
llvm_unreachable("Fully covered switch above");
}
llvm::Expected<std::vector<lldb::addr_t>>
ProcessWasm::GetWasmCallStack(lldb::tid_t tid) {
StreamString packet;
packet.Printf("qWasmCallStack:");
packet.Printf("%" PRIx64, tid);
StringExtractorGDBRemote response;
if (m_gdb_comm.SendPacketAndWaitForResponse(packet.GetString(), response) !=
GDBRemoteCommunication::PacketResult::Success)
return llvm::createStringError("failed to send qWasmCallStack");
if (!response.IsNormalResponse())
return llvm::createStringError("failed to get response for qWasmCallStack");
WritableDataBufferSP data_buffer_sp =
std::make_shared<DataBufferHeap>(response.GetStringRef().size() / 2, 0);
const size_t bytes = response.GetHexBytes(data_buffer_sp->GetData(), '\xcc');
if (bytes == 0 || bytes % sizeof(uint64_t) != 0)
return llvm::createStringError("invalid response for qWasmCallStack");
// To match the Wasm specification, the addresses are encoded in little endian
// byte order.
DataExtractor data(data_buffer_sp, lldb::eByteOrderLittle,
GetAddressByteSize());
lldb::offset_t offset = 0;
std::vector<lldb::addr_t> call_stack_pcs;
while (offset < bytes)
call_stack_pcs.push_back(data.GetU64(&offset));
return call_stack_pcs;
}
llvm::Expected<lldb::DataBufferSP>
ProcessWasm::GetWasmVariable(WasmVirtualRegisterKinds kind, int frame_index,
int index) {
StreamString packet;
switch (kind) {
case eWasmTagLocal:
packet.Printf("qWasmLocal:");
break;
case eWasmTagGlobal:
packet.Printf("qWasmGlobal:");
break;
case eWasmTagOperandStack:
packet.PutCString("qWasmStackValue:");
break;
case eWasmTagNotAWasmLocation:
return llvm::createStringError("not a Wasm location");
}
packet.Printf("%d;%d", frame_index, index);
StringExtractorGDBRemote response;
if (m_gdb_comm.SendPacketAndWaitForResponse(packet.GetString(), response) !=
GDBRemoteCommunication::PacketResult::Success)
return llvm::createStringError("failed to send Wasm variable");
if (!response.IsNormalResponse())
return llvm::createStringError("failed to get response for Wasm variable");
WritableDataBufferSP buffer_sp(
new DataBufferHeap(response.GetStringRef().size() / 2, 0));
response.GetHexBytes(buffer_sp->GetData(), '\xcc');
return buffer_sp;
}
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