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111 lines
3.5 KiB
C++
111 lines
3.5 KiB
C++
/* -*- Mode: C; tab-width: 8; indent-tabs-mode: nil; c-basic-offset: 4 -*-
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* vim: set ts=8 sw=4 et tw=79 ft=cpp:
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*
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* ***** BEGIN LICENSE BLOCK *****
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* Version: MPL 1.1/GPL 2.0/LGPL 2.1
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*
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* The contents of this file are subject to the Mozilla Public License Version
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* 1.1 (the "License"); you may not use this file except in compliance with
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* the License. You may obtain a copy of the License at
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* http://www.mozilla.org/MPL/
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*
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* Software distributed under the License is distributed on an "AS IS" basis,
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* WITHOUT WARRANTY OF ANY KIND, either express or implied. See the License
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* for the specific language governing rights and limitations under the
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* License.
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*
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* The Original Code is Mozilla SpiderMonkey JavaScript 1.9 code, released
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* May 28, 2008.
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*
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* The Initial Developer of the Original Code is
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* Brendan Eich <brendan@mozilla.org
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*
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* Contributor(s):
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*
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* Alternatively, the contents of this file may be used under the terms of
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* either of the GNU General Public License Version 2 or later (the "GPL"),
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* or the GNU Lesser General Public License Version 2.1 or later (the "LGPL"),
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* in which case the provisions of the GPL or the LGPL are applicable instead
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* of those above. If you wish to allow use of your version of this file only
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* under the terms of either the GPL or the LGPL, and not to allow others to
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* use your version of this file under the terms of the MPL, indicate your
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* decision by deleting the provisions above and replace them with the notice
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* and other provisions required by the GPL or the LGPL. If you do not delete
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* the provisions above, a recipient may use your version of this file under
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* the terms of any one of the MPL, the GPL or the LGPL.
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*
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* ***** END LICENSE BLOCK ***** */
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#ifndef jstracer_h___
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#define jstracer_h___
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#include "jsstddef.h"
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#include "jslock.h"
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namespace nanojit {
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class LIns;
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class Fragmento;
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class Fragment;
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class LirWriter;
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}
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/*
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* Tracker is used to keep track of values being manipulated by the
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* interpreter during trace recording.
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*/
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class Tracker
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{
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struct Page {
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struct Page* next;
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long base;
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nanojit::LIns* map[0];
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};
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struct Page* pagelist;
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long getPageBase(const void* v) const;
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struct Page* findPage(const void* v) const;
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struct Page* addPage(const void* v);
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public:
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Tracker();
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~Tracker();
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nanojit::LIns* get(const void* v) const;
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void set(const void* v, nanojit::LIns* ins);
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void clear();
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};
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enum TraceRecorderStatus {
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IDLE, RECORDING, ABORTED
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};
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/*
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* Trace monitor. Every runtime is associated with a trace monitor that keeps
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* track of loop frequencies for all JavaScript code loaded into that runtime.
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* For this we use a loop table. Adjacent slots in the loop table, one for each
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* loop header in a given script, are requested using lock-free synchronization
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* from the runtime-wide loop table slot space, when the script is compiled.
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*
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* The loop table also doubles as trace tree pointer table once a loop achieves
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* a certain number of iterations and we recorded a tree for that loop.
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*/
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struct JSTraceMonitor {
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int freq;
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TraceRecorderStatus status;
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JSFrameRegs entryState;
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Tracker tracker;
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nanojit::Fragment* fragment;
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nanojit::Fragmento* fragmento;
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nanojit::LirWriter* lir;
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};
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#define ENABLE_TRACER true
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#define TRACE_TRIGGER_MASK 0x3f
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extern void
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js_StartRecording(JSContext* cx, JSFrameRegs& regs);
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extern void
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js_EndRecording(JSContext* cx, JSFrameRegs& regs);
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#endif /* jstracer_h___ */
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