LulDwarfSummariser.h

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/* -*- Mode: C++; tab-width: 8; indent-tabs-mode: nil; c-basic-offset: 2 -*- */

/* vim: set ts=8 sts=2 et sw=2 tw=80: */

/* This Source Code Form is subject to the terms of the Mozilla Public

 * License, v. 2.0. If a copy of the MPL was not distributed with this

 * file, You can obtain one at http://mozilla.org/MPL/2.0/. */

#ifndef LulDwarfSummariser_h

#define LulDwarfSummariser_h

#include "LulMainInt.h"

namespace lul {

class Summariser {

 public:

  Summariser(SecMap* aSecMap, uintptr_t aTextBias, void (*aLog)(const char*));

  virtual void Entry(uintptr_t aAddress, uintptr_t aLength);

  virtual void End();

  // Tell the summariser that the value for |aNewReg| at |aAddress| is

  // recovered using the LExpr that can be constructed using the

  // components |how|, |oldReg| and |offset|.  The summariser will

  // inspect the components and may reject them for various reasons,

  // but the hope is that it will find them acceptable and record this

  // rule permanently.

  virtual void Rule(uintptr_t aAddress, int aNewReg, LExprHow how,

                    int16_t oldReg, int64_t offset);

  virtual uint32_t AddPfxInstr(PfxInstr pfxi);

  // Send output to the logging sink, for debugging.

  virtual void Log(const char* str) { mLog(str); }

 private:

  // The SecMap in which we park the finished summaries (RuleSets) and

  // also any PfxInstrs derived from Dwarf expressions.

  SecMap* mSecMap;

  // Running state for the current summary (RuleSet) under construction.

  RuleSet mCurrRules;

  // The start of the address range to which the RuleSet under

  // construction applies.

  uintptr_t mCurrAddr;

  // The highest address, plus one, for which the RuleSet under

  // construction could possibly apply.  If there are no further

  // incoming events then mCurrRules will eventually be emitted

  // as-is, for the range mCurrAddr.. mMax1Addr - 1, if that is

  // nonempty.

  uintptr_t mMax1Addr;

  // The bias value (to add to the SVMAs, to get AVMAs) to be used

  // when adding entries into mSecMap.

  uintptr_t mTextBias;

  // A logging sink, for debugging.

  void (*mLog)(const char* aFmt);

};

}  // namespace lul

#endif  // LulDwarfSummariser_h