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
114 lines
3.9 KiB
C++
114 lines
3.9 KiB
C++
//===-- AppleGetThreadItemInfoHandler.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_AppleGetThreadItemInfoHandler_h_
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#define lldb_AppleGetThreadItemInfoHandler_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_thread_get_item_info()
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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_thread_item_info_return_values
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// {
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// introspection_dispatch_item_info_ref *item_buffer;
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// uint64_t item_buffer_size;
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// };
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//
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// The item_buffer pointer is an address in the inferior program's address
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// space (item_buffer_size in size) which must be mach_vm_deallocate'd by
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// lldb.
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//
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// The AppleGetThreadItemInfoHandler 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 AppleGetThreadItemInfoHandler {
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public:
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AppleGetThreadItemInfoHandler (lldb_private::Process *process);
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~AppleGetThreadItemInfoHandler();
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struct GetThreadItemInfoReturnInfo
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{
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lldb::addr_t item_buffer_ptr; /* the address of the item buffer from libBacktraceRecording */
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lldb::addr_t item_buffer_size; /* the size of the item buffer from libBacktraceRecording */
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GetThreadItemInfoReturnInfo() :
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item_buffer_ptr(LLDB_INVALID_ADDRESS),
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item_buffer_size(0)
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{}
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};
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//----------------------------------------------------------
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/// Get the information about a work item by calling
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/// __introspection_dispatch_thread_get_item_info. 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_id
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/// The thread to get the extended backtrace for.
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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 item_buffer_ptr value will be LLDB_INVALID_ADDRESS.
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//----------------------------------------------------------
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GetThreadItemInfoReturnInfo
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GetThreadItemInfo (Thread &thread, lldb::tid_t thread_id, 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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SetupGetThreadItemInfoFunction (Thread &thread, ValueList &get_thread_item_info_arglist);
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static const char *g_get_thread_item_info_function_name;
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static const char *g_get_thread_item_info_function_code;
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lldb_private::Process *m_process;
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std::unique_ptr<UtilityFunction> m_get_thread_item_info_impl_code;
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Mutex m_get_thread_item_info_function_mutex;
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lldb::addr_t m_get_thread_item_info_return_buffer_addr;
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Mutex m_get_thread_item_info_retbuffer_mutex;
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};
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} // using namespace lldb_private
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#endif // lldb_AppleGetThreadItemInfoHandler_h_
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