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