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//===-- AppleGetQueuesHandler.h ----------------------------*- C++ -*-===//
//
// The LLVM Compiler Infrastructure
//
// This file is distributed under the University of Illinois Open Source
// License. See LICENSE.TXT for details.
//
//===----------------------------------------------------------------------===//
#ifndef lldb_AppleGetQueuesHandler_h_
#define lldb_AppleGetQueuesHandler_h_
#include <map>
#include <mutex>
#include <vector>
#include "lldb/Symbol/CompilerType.h"
#include "lldb/Utility/Status.h"
#include "lldb/lldb-public.h"
// This class will insert a UtilityFunction into the inferior process for
// calling libBacktraceRecording's introspection_get_dispatch_queues()
// function. The function in the inferior will return a struct by value
// with these members:
//
// struct get_current_queues_return_values
// {
// introspection_dispatch_queue_info_t *queues_buffer;
// uint64_t queues_buffer_size;
// uint64_t count;
// };
//
// The queues_buffer pointer is an address in the inferior program's address
// space (queues_buffer_size in size) which must be mach_vm_deallocate'd by
// lldb. count is the number of queues that were stored in the buffer.
//
// The AppleGetQueuesHandler object should persist so that the UtilityFunction
// can be reused multiple times.
namespace lldb_private {
class AppleGetQueuesHandler {
public:
AppleGetQueuesHandler(lldb_private::Process *process);
~AppleGetQueuesHandler();
struct GetQueuesReturnInfo {
lldb::addr_t queues_buffer_ptr; /* the address of the queues buffer from
libBacktraceRecording */
lldb::addr_t queues_buffer_size; /* the size of the queues buffer from
libBacktraceRecording */
uint64_t count; /* the number of queues included in the queues buffer */
GetQueuesReturnInfo()
: queues_buffer_ptr(LLDB_INVALID_ADDRESS), queues_buffer_size(0),
count(0) {}
};
//----------------------------------------------------------
/// Get the list of queues that exist (with any active or pending items) via
/// a call to introspection_get_dispatch_queues(). If there's a page of
/// memory that needs to be freed, pass in the address and size and it will
/// be freed before getting the list of queues.
///
/// @param [in] thread
/// The thread to run this plan on.
///
/// @param [in] page_to_free
/// An address of an inferior process vm page that needs to be
/// deallocated,
/// LLDB_INVALID_ADDRESS if this is not needed.
///
/// @param [in] page_to_free_size
/// The size of the vm page that needs to be deallocated if an address was
/// passed in to page_to_free.
///
/// @param [out] error
/// This object will be updated with the error status / error string from
/// any failures encountered.
///
/// @returns
/// The result of the inferior function call execution. If there was a
/// failure of any kind while getting
/// the information, the queues_buffer_ptr value will be
/// LLDB_INVALID_ADDRESS.
//----------------------------------------------------------
GetQueuesReturnInfo GetCurrentQueues(Thread &thread,
lldb::addr_t page_to_free,
uint64_t page_to_free_size,
lldb_private::Status &error);
void Detach();
private:
lldb::addr_t SetupGetQueuesFunction(Thread &thread,
ValueList &get_queues_arglist);
static const char *g_get_current_queues_function_name;
static const char *g_get_current_queues_function_code;
lldb_private::Process *m_process;
std::unique_ptr<UtilityFunction> m_get_queues_impl_code_up;
std::mutex m_get_queues_function_mutex;
lldb::addr_t m_get_queues_return_buffer_addr;
std::mutex m_get_queues_retbuffer_mutex;
};
} // using namespace lldb_private
#endif // lldb_AppleGetQueuesHandler_h_
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