151c032c86
Before we had: ClangFunction ClangUtilityFunction ClangUserExpression and code all over in lldb that explicitly made Clang-based expressions. This patch adds an Expression base class, and three pure virtual implementations for the Expression kinds: FunctionCaller UtilityFunction UserExpression You can request one of these expression types from the Target using the Get<ExpressionType>ForLanguage. The Target will then consult all the registered TypeSystem plugins, and if the type system that matches the language can make an expression of that kind, it will do so and return it. Because all of the real expression types need to communicate with their ExpressionParser in a uniform way, I also added a ExpressionTypeSystemHelper class that expressions generically can vend, and a ClangExpressionHelper that encapsulates the operations that the ClangExpressionParser needs to perform on the ClangExpression types. Then each of the Clang* expression kinds constructs the appropriate helper to do what it needs. The patch also fixes a wart in the UtilityFunction that to use it you had to create a parallel FunctionCaller to actually call the function made by the UtilityFunction. Now the UtilityFunction can be asked to vend a FunctionCaller that will run its function. This cleaned up a lot of boiler plate code using UtilityFunctions. Note, in this patch all the expression types explicitly depend on the LLVM JIT and IR, and all the common JIT running code is in the FunctionCaller etc base classes. At some point we could also abstract that dependency but I don't see us adding another back end in the near term, so I'll leave that exercise till it is actually necessary. llvm-svn: 247720
120 lines
4.2 KiB
C++
120 lines
4.2 KiB
C++
//===-- AppleGetPendingItemsHandler.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_AppleGetPendingItemsHandler_h_
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#define lldb_AppleGetPendingItemsHandler_h_
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// C Includes
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// C++ Includes
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#include <map>
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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/lldb-public.h"
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#include "lldb/Core/Error.h"
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#include "lldb/Host/Mutex.h"
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#include "lldb/Symbol/CompilerType.h"
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// This class will insert a UtilityFunction into the inferior process for
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// calling libBacktraceRecording's __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 UtilityFunction
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// can be reused multiple times.
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namespace lldb_private
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{
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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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{
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lldb::addr_t items_buffer_ptr; /* the address of the pending items buffer from libBacktraceRecording */
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lldb::addr_t items_buffer_size; /* the size of the pending items buffer from 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),
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items_buffer_size(0),
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count(0)
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{}
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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 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 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 failure of any kind while getting
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/// the information, the items_buffer_ptr value will be LLDB_INVALID_ADDRESS.
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//----------------------------------------------------------
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GetPendingItemsReturnInfo
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GetPendingItems (Thread &thread, lldb::addr_t queue, lldb::addr_t page_to_free, uint64_t page_to_free_size, lldb_private::Error &error);
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void
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Detach ();
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private:
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lldb::addr_t
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SetupGetPendingItemsFunction (Thread &thread, 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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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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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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