194 lines
8.4 KiB
C++
194 lines
8.4 KiB
C++
/*
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* Copyright 1997-2007 Sun Microsystems, Inc. All Rights Reserved.
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* DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
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*
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* This code is free software; you can redistribute it and/or modify it
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* under the terms of the GNU General Public License version 2 only, as
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* published by the Free Software Foundation.
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*
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* This code is distributed in the hope that it will be useful, but WITHOUT
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* ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
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* FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License
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* version 2 for more details (a copy is included in the LICENSE file that
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* accompanied this code).
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*
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* You should have received a copy of the GNU General Public License version
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* 2 along with this work; if not, write to the Free Software Foundation,
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* Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
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*
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* Please contact Sun Microsystems, Inc., 4150 Network Circle, Santa Clara,
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* CA 95054 USA or visit www.sun.com if you need additional information or
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* have any questions.
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*
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*/
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// A frame represents a physical stack frame (an activation). Frames can be
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// C or Java frames, and the Java frames can be interpreted or compiled.
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// In contrast, vframes represent source-level activations, so that one physical frame
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// can correspond to multiple source level frames because of inlining.
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// A frame is comprised of {pc, fp, sp}
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// ------------------------------ Asm interpreter ----------------------------------------
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// Layout of asm interpreter frame:
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// [expression stack ] * <- sp
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// [monitors ] \
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// ... | monitor block size
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// [monitors ] /
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// [monitor block size ]
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// [byte code index/pointr] = bcx() bcx_offset
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// [pointer to locals ] = locals() locals_offset
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// [constant pool cache ] = cache() cache_offset
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// [methodData ] = mdp() mdx_offset
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// [methodOop ] = method() method_offset
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// [last sp ] = last_sp() last_sp_offset
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// [old stack pointer ] (sender_sp) sender_sp_offset
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// [old frame pointer ] <- fp = link()
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// [return pc ]
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// [oop temp ] (only for native calls)
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// [locals and parameters ]
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// <- sender sp
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// ------------------------------ Asm interpreter ----------------------------------------
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// ------------------------------ C++ interpreter ----------------------------------------
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//
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// Layout of C++ interpreter frame: (While executing in BytecodeInterpreter::run)
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//
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// <- SP (current esp/rsp)
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// [local variables ] BytecodeInterpreter::run local variables
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// ... BytecodeInterpreter::run local variables
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// [local variables ] BytecodeInterpreter::run local variables
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// [old frame pointer ] fp [ BytecodeInterpreter::run's ebp/rbp ]
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// [return pc ] (return to frame manager)
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// [interpreter_state* ] (arg to BytecodeInterpreter::run) --------------
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// [expression stack ] <- last_Java_sp |
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// [... ] * <- interpreter_state.stack |
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// [expression stack ] * <- interpreter_state.stack_base |
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// [monitors ] \ |
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// ... | monitor block size |
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// [monitors ] / <- interpreter_state.monitor_base |
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// [struct interpretState ] <-----------------------------------------|
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// [return pc ] (return to callee of frame manager [1]
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// [locals and parameters ]
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// <- sender sp
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// [1] When the c++ interpreter calls a new method it returns to the frame
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// manager which allocates a new frame on the stack. In that case there
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// is no real callee of this newly allocated frame. The frame manager is
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// aware of the additional frame(s) and will pop them as nested calls
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// complete. Howevers tTo make it look good in the debugger the frame
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// manager actually installs a dummy pc pointing to RecursiveInterpreterActivation
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// with a fake interpreter_state* parameter to make it easy to debug
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// nested calls.
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// Note that contrary to the layout for the assembly interpreter the
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// expression stack allocated for the C++ interpreter is full sized.
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// However this is not as bad as it seems as the interpreter frame_manager
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// will truncate the unused space on succesive method calls.
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//
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// ------------------------------ C++ interpreter ----------------------------------------
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public:
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enum {
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pc_return_offset = 0,
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// All frames
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link_offset = 0,
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return_addr_offset = 1,
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// non-interpreter frames
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sender_sp_offset = 2,
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#ifndef CC_INTERP
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// Interpreter frames
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interpreter_frame_result_handler_offset = 3, // for native calls only
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interpreter_frame_oop_temp_offset = 2, // for native calls only
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interpreter_frame_sender_sp_offset = -1,
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// outgoing sp before a call to an invoked method
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interpreter_frame_last_sp_offset = interpreter_frame_sender_sp_offset - 1,
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interpreter_frame_method_offset = interpreter_frame_last_sp_offset - 1,
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interpreter_frame_mdx_offset = interpreter_frame_method_offset - 1,
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interpreter_frame_cache_offset = interpreter_frame_mdx_offset - 1,
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interpreter_frame_locals_offset = interpreter_frame_cache_offset - 1,
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interpreter_frame_bcx_offset = interpreter_frame_locals_offset - 1,
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interpreter_frame_initial_sp_offset = interpreter_frame_bcx_offset - 1,
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interpreter_frame_monitor_block_top_offset = interpreter_frame_initial_sp_offset,
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interpreter_frame_monitor_block_bottom_offset = interpreter_frame_initial_sp_offset,
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#endif // CC_INTERP
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// Entry frames
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#ifdef AMD64
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#ifdef _WIN64
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entry_frame_after_call_words = 8,
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entry_frame_call_wrapper_offset = 2,
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arg_reg_save_area_bytes = 32, // Register argument save area
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#else
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entry_frame_after_call_words = 13,
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entry_frame_call_wrapper_offset = -6,
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arg_reg_save_area_bytes = 0,
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#endif // _WIN64
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#else
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entry_frame_call_wrapper_offset = 2,
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#endif // AMD64
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// Native frames
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native_frame_initial_param_offset = 2
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};
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intptr_t ptr_at(int offset) const {
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return *ptr_at_addr(offset);
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}
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void ptr_at_put(int offset, intptr_t value) {
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*ptr_at_addr(offset) = value;
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}
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private:
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// an additional field beyond _sp and _pc:
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intptr_t* _fp; // frame pointer
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// The interpreter and adapters will extend the frame of the caller.
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// Since oopMaps are based on the sp of the caller before extension
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// we need to know that value. However in order to compute the address
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// of the return address we need the real "raw" sp. Since sparc already
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// uses sp() to mean "raw" sp and unextended_sp() to mean the caller's
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// original sp we use that convention.
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intptr_t* _unextended_sp;
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intptr_t* ptr_at_addr(int offset) const {
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return (intptr_t*) addr_at(offset);
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}
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public:
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// Constructors
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frame(intptr_t* sp, intptr_t* fp, address pc);
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frame(intptr_t* sp, intptr_t* unextended_sp, intptr_t* fp, address pc);
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frame(intptr_t* sp, intptr_t* fp);
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// accessors for the instance variables
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intptr_t* fp() const { return _fp; }
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inline address* sender_pc_addr() const;
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// return address of param, zero origin index.
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inline address* native_param_addr(int idx) const;
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// expression stack tos if we are nested in a java call
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intptr_t* interpreter_frame_last_sp() const;
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#ifndef CC_INTERP
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// deoptimization support
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void interpreter_frame_set_last_sp(intptr_t* sp);
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#endif // CC_INTERP
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#ifdef CC_INTERP
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inline interpreterState get_interpreterState() const;
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#endif // CC_INTERP
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