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149 lines
4.8 KiB
C
149 lines
4.8 KiB
C
/*
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* COPYRIGHT: See COPYING in the top level directory
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* PROJECT: ReactOS kernel
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* FILE: lib/rossym/find.c
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* PURPOSE: Find symbol info for an address
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*
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* PROGRAMMERS: Ge van Geldorp (gvg@reactos.com)
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*/
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/*
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* Parts of this file based on work Copyright (c) 1990, 1993
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* The Regents of the University of California. All rights reserved.
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*
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* Redistribution and use in source and binary forms, with or without
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* modification, are permitted provided that the following conditions
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* are met:
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* 1. Redistributions of source code must retain the above copyright
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* notice, this list of conditions and the following disclaimer.
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* 2. Redistributions in binary form must reproduce the above copyright
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* notice, this list of conditions and the following disclaimer in the
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* documentation and/or other materials provided with the distribution.
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* 4. Neither the name of the University nor the names of its contributors
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* may be used to endorse or promote products derived from this software
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* without specific prior written permission.
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*
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* THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
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* ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
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* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
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* ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
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* FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
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* DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
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* OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
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* HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
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* LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
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* OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
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* SUCH DAMAGE.
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*/
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#include <ntdef.h>
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#include <reactos/rossym.h>
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#include "rossympriv.h"
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#define NDEBUG
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#include <debug.h>
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static PROSSYM_ENTRY
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FindEntry(IN PROSSYM_INFO RosSymInfo, IN ULONG_PTR RelativeAddress)
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{
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/*
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* Perform a binary search.
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*
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* The code below is a bit sneaky. After a comparison fails, we
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* divide the work in half by moving either left or right. If lim
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* is odd, moving left simply involves halving lim: e.g., when lim
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* is 5 we look at item 2, so we change lim to 2 so that we will
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* look at items 0 & 1. If lim is even, the same applies. If lim
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* is odd, moving right again involes halving lim, this time moving
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* the base up one item past p: e.g., when lim is 5 we change base
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* to item 3 and make lim 2 so that we will look at items 3 and 4.
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* If lim is even, however, we have to shrink it by one before
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* halving: e.g., when lim is 4, we still looked at item 2, so we
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* have to make lim 3, then halve, obtaining 1, so that we will only
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* look at item 3.
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*/
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PROSSYM_ENTRY Base = RosSymInfo->Symbols;
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ULONG Lim;
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PROSSYM_ENTRY Mid, Low;
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if (RelativeAddress < Base->Address)
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{
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return NULL;
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}
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Low = Base;
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for (Lim = RosSymInfo->SymbolsCount; Lim != 0; Lim >>= 1)
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{
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Mid = Base + (Lim >> 1);
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if (RelativeAddress == Mid->Address)
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{
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return Mid;
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}
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if (Mid->Address < RelativeAddress) /* key > mid: move right */
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{
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Low = Mid;
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Base = Mid + 1;
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Lim--;
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} /* else move left */
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}
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return Low;
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}
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BOOLEAN
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RosSymGetAddressInformation(PROSSYM_INFO RosSymInfo,
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ULONG_PTR RelativeAddress,
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ULONG *LineNumber,
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char *FileName,
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char *FunctionName)
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{
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PROSSYM_ENTRY RosSymEntry;
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DPRINT("RelativeAddress = 0x%08x\n", RelativeAddress);
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if (RosSymInfo->Symbols == NULL || RosSymInfo->SymbolsCount == 0 ||
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RosSymInfo->Strings == NULL || RosSymInfo->StringsLength == 0)
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{
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DPRINT1("Uninitialized RosSymInfo\n");
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return FALSE;
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}
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ASSERT(LineNumber || FileName || FunctionName);
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/* find symbol entry for function */
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RosSymEntry = FindEntry(RosSymInfo, RelativeAddress);
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if (NULL == RosSymEntry)
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{
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DPRINT("None of the requested information was found!\n");
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return FALSE;
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}
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if (LineNumber != NULL)
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{
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*LineNumber = RosSymEntry->SourceLine;
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}
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if (FileName != NULL)
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{
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PCSTR Name = "";
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if (RosSymEntry->FileOffset != 0)
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{
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Name = (PCHAR) RosSymInfo->Strings + RosSymEntry->FileOffset;
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}
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strcpy(FileName, Name);
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}
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if (FunctionName != NULL)
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{
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PCSTR Name = "";
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if (RosSymEntry->FunctionOffset != 0)
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{
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Name = (PCHAR) RosSymInfo->Strings + RosSymEntry->FunctionOffset;
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}
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strcpy(FunctionName, Name);
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}
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return TRUE;
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}
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/* EOF */
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