find.c File Reference

#include <ntdef.h>
#include <reactos/rossym.h>
#include "rossympriv.h"
#include <debug.h>

Include dependency graph for find.c:

Go to the source code of this file.

Macros
#define	NDEBUG

Functions
static PROSSYM_ENTRY	FindEntry (IN PROSSYM_INFO RosSymInfo, IN ULONG_PTR RelativeAddress)
BOOLEAN	RosSymGetAddressInformation (PROSSYM_INFO RosSymInfo, ULONG_PTR RelativeAddress, ULONG *LineNumber, char *FileName, char *FunctionName)

Macro Definition Documentation

NDEBUG

#define NDEBUG

Definition at line 42 of file find.c.

Function Documentation

FindEntry()

static PROSSYM_ENTRY FindEntry ( IN PROSSYM_INFO  RosSymInfo, IN ULONG_PTR  RelativeAddress  )

static

Definition at line 46 of file find.c.

{
  /*
   * Perform a binary search.
   *
   * The code below is a bit sneaky.  After a comparison fails, we
   * divide the work in half by moving either left or right. If lim
   * is odd, moving left simply involves halving lim: e.g., when lim
   * is 5 we look at item 2, so we change lim to 2 so that we will
   * look at items 0 & 1.  If lim is even, the same applies.  If lim
   * is odd, moving right again involes halving lim, this time moving
   * the base up one item past p: e.g., when lim is 5 we change base
   * to item 3 and make lim 2 so that we will look at items 3 and 4.
   * If lim is even, however, we have to shrink it by one before
   * halving: e.g., when lim is 4, we still looked at item 2, so we
   * have to make lim 3, then halve, obtaining 1, so that we will only
   * look at item 3.
   */
  PROSSYM_ENTRY Base = RosSymInfo->Symbols;
  ULONG Lim;
  PROSSYM_ENTRY Mid, Low;
 
  if (RelativeAddress < Base->Address)
    {
      return NULL;
    }
 
  Low = Base;
  for (Lim = RosSymInfo->SymbolsCount; Lim != 0; Lim >>= 1)
    {
      Mid = Base + (Lim >> 1);
      if (RelativeAddress == Mid->Address)
        {
          return Mid;
        }
      if (Mid->Address < RelativeAddress)  /* key > mid: move right */
        {
          Low = Mid;
          Base = Mid + 1;
          Lim--;
        }               /* else move left */
    }
 
  return Low;
}

Referenced by RosSymGetAddressInformation().

RosSymGetAddressInformation()

BOOLEAN RosSymGetAddressInformation	(	PROSSYM_INFO	RosSymInfo,
		ULONG_PTR	RelativeAddress,
		ULONG *	LineNumber,
		char *	FileName,
		char *	FunctionName
	)

Definition at line 94 of file find.c.

{
  PROSSYM_ENTRY RosSymEntry;
 
  DPRINT("RelativeAddress = 0x%08x\n", RelativeAddress);
 
  if (RosSymInfo->Symbols == NULL || RosSymInfo->SymbolsCount == 0 ||
      RosSymInfo->Strings == NULL || RosSymInfo->StringsLength == 0)
    {
      DPRINT1("Uninitialized RosSymInfo\n");
      return FALSE;
    }
 
  ASSERT(LineNumber || FileName || FunctionName);
 
  /* find symbol entry for function */
  RosSymEntry = FindEntry(RosSymInfo, RelativeAddress);
 
  if (NULL == RosSymEntry)
    {
      DPRINT("None of the requested information was found!\n");
      return FALSE;
    }
 
  if (LineNumber != NULL)
    {
      *LineNumber = RosSymEntry->SourceLine;
    }
  if (FileName != NULL)
    {
      PCSTR Name = "";
      if (RosSymEntry->FileOffset != 0)
        {
          Name = (PCHAR) RosSymInfo->Strings + RosSymEntry->FileOffset;
        }
      strcpy(FileName, Name);
    }
  if (FunctionName != NULL)
    {
      PCSTR Name = "";
      if (RosSymEntry->FunctionOffset != 0)
        {
          Name = (PCHAR) RosSymInfo->Strings + RosSymEntry->FunctionOffset;
        }
      strcpy(FunctionName, Name);
    }
 
  return TRUE;
}

Referenced by KdbSymPrintAddress().