2946cd7010
to reflect the new license. We understand that people may be surprised that we're moving the header entirely to discuss the new license. We checked this carefully with the Foundation's lawyer and we believe this is the correct approach. Essentially, all code in the project is now made available by the LLVM project under our new license, so you will see that the license headers include that license only. Some of our contributors have contributed code under our old license, and accordingly, we have retained a copy of our old license notice in the top-level files in each project and repository. llvm-svn: 351636
120 lines
4.2 KiB
C++
120 lines
4.2 KiB
C++
//===-- AppleGetPendingItemsHandler.h ----------------------------*- C++
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//-*-===//
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//
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// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
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// See https://llvm.org/LICENSE.txt for license information.
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// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
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//
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//===----------------------------------------------------------------------===//
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#ifndef lldb_AppleGetPendingItemsHandler_h_
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#define lldb_AppleGetPendingItemsHandler_h_
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#include <map>
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#include <mutex>
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#include <vector>
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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
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// __introspection_dispatch_queue_get_pending_items()
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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_pending_items_return_values
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// {
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// introspection_dispatch_item_info_ref *items_buffer;
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// uint64_t items_buffer_size;
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// uint64_t count;
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// };
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//
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// The items_buffer pointer is an address in the inferior program's address
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// space (items_buffer_size in size) which must be mach_vm_deallocate'd by
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// lldb. count is the number of items that were stored in the buffer.
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//
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// The AppleGetPendingItemsHandler object should persist so that the
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// UtilityFunction
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// can be reused multiple times.
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namespace lldb_private {
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class AppleGetPendingItemsHandler {
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public:
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AppleGetPendingItemsHandler(lldb_private::Process *process);
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~AppleGetPendingItemsHandler();
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struct GetPendingItemsReturnInfo {
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lldb::addr_t items_buffer_ptr; /* the address of the pending items buffer
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from libBacktraceRecording */
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lldb::addr_t
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items_buffer_size; /* the size of the pending items buffer from
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libBacktraceRecording */
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uint64_t count; /* the number of pending items included in the buffer */
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GetPendingItemsReturnInfo()
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: items_buffer_ptr(LLDB_INVALID_ADDRESS), items_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 pending items for a given queue via a call to
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/// __introspection_dispatch_queue_get_pending_items. 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] queue
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/// The dispatch_queue_t value for the queue of interest.
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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 items_buffer_ptr value will be
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/// LLDB_INVALID_ADDRESS.
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//----------------------------------------------------------
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GetPendingItemsReturnInfo GetPendingItems(Thread &thread, lldb::addr_t queue,
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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
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SetupGetPendingItemsFunction(Thread &thread,
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ValueList &get_pending_items_arglist);
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static const char *g_get_pending_items_function_name;
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static const char *g_get_pending_items_function_code;
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lldb_private::Process *m_process;
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std::unique_ptr<UtilityFunction> m_get_pending_items_impl_code;
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std::mutex m_get_pending_items_function_mutex;
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lldb::addr_t m_get_pending_items_return_buffer_addr;
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std::mutex m_get_pending_items_retbuffer_mutex;
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};
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} // using namespace lldb_private
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#endif // lldb_AppleGetPendingItemsHandler_h_
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