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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 "UnwindWasm.h"
#include "Plugins/Process/gdb-remote/ThreadGDBRemote.h"
#include "ProcessWasm.h"
#include "ThreadWasm.h"
#include "lldb/Utility/LLDBLog.h"
#include "lldb/Utility/Log.h"
using namespace lldb;
using namespace lldb_private;
using namespace process_gdb_remote;
using namespace wasm;
class WasmGDBRemoteRegisterContext : public GDBRemoteRegisterContext {
public:
WasmGDBRemoteRegisterContext(ThreadGDBRemote &thread,
uint32_t concrete_frame_idx,
GDBRemoteDynamicRegisterInfoSP ®_info_sp,
uint64_t pc)
: GDBRemoteRegisterContext(thread, concrete_frame_idx, reg_info_sp, false,
false) {
// Wasm does not have a fixed set of registers but relies on a mechanism
// named local and global variables to store information such as the stack
// pointer. The only actual register is the PC.
PrivateSetRegisterValue(0, pc);
}
};
lldb::RegisterContextSP
UnwindWasm::DoCreateRegisterContextForFrame(lldb_private::StackFrame *frame) {
if (m_frames.size() <= frame->GetFrameIndex())
return lldb::RegisterContextSP();
ThreadSP thread = frame->GetThread();
ThreadGDBRemote *gdb_thread = static_cast<ThreadGDBRemote *>(thread.get());
ProcessWasm *wasm_process =
static_cast<ProcessWasm *>(thread->GetProcess().get());
return std::make_shared<WasmGDBRemoteRegisterContext>(
*gdb_thread, frame->GetConcreteFrameIndex(),
wasm_process->GetRegisterInfo(), m_frames[frame->GetFrameIndex()]);
}
uint32_t UnwindWasm::DoGetFrameCount() {
if (m_unwind_complete)
return m_frames.size();
m_unwind_complete = true;
m_frames.clear();
ThreadWasm &wasm_thread = static_cast<ThreadWasm &>(GetThread());
llvm::Expected<std::vector<lldb::addr_t>> call_stack_pcs =
wasm_thread.GetWasmCallStack();
if (!call_stack_pcs) {
LLDB_LOG_ERROR(GetLog(LLDBLog::Unwind), call_stack_pcs.takeError(),
"Failed to get Wasm callstack: {0}");
m_frames.clear();
return 0;
}
m_frames = *call_stack_pcs;
return m_frames.size();
}
bool UnwindWasm::DoGetFrameInfoAtIndex(uint32_t frame_idx, lldb::addr_t &cfa,
lldb::addr_t &pc,
bool &behaves_like_zeroth_frame) {
if (m_frames.size() == 0)
DoGetFrameCount();
if (frame_idx >= m_frames.size())
return false;
behaves_like_zeroth_frame = (frame_idx == 0);
cfa = 0;
pc = m_frames[frame_idx];
return true;
}
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