* Bring back rbuild build to be used until bug 6372 is fixed.

[reactos.git] / lib / rossym / find.c

diff --git a/lib/rossym/find.c b/lib/rossym/find.c
index 5f613dc..c311e3e 100644 (file)
--- a/lib/rossym/find.c
+++ b/lib/rossym/find.c
@@ -42,9 +42,53 @@
 #define NDEBUG
 #include <debug.h>
 
-#include "rossym.h"
-#include "dwarf.h"
-#include "pe.h"
+static PROSSYM_ENTRY
+FindEntry(IN PROSSYM_INFO RosSymInfo, IN ULONG_PTR RelativeAddress)
+{
+  /*
+   * 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;
+}
+
 
 BOOLEAN
 RosSymGetAddressInformation(PROSSYM_INFO RosSymInfo,
@@ -53,34 +97,52 @@ RosSymGetAddressInformation(PROSSYM_INFO RosSymInfo,
                             char *FileName,
                             char *FunctionName)
 {
-       char *cdir, *dir, *file, *function;
-       ulong line, mtime, length;
-       int res = dwarfpctoline
-               (RosSymInfo, 
-                RelativeAddress + RosSymInfo->pe->imagebase, 
-                &cdir,
-                &dir,
-                &file,
-                &function,
-                &line,
-                &mtime,
-                &length);
-       if (res != -1) {
-               *LineNumber = line;
-               FileName[0] = 0;
-               if (dir) {
-                       strcpy(FileName, dir);
-                       strcat(FileName, "/");
-               }
-               if (file)
-                       strcat(FileName, file);
-               FunctionName[0] = 0;
-               if (function)
-                       strcpy(FunctionName, function);
-               return TRUE;
-       } else {
-               return FALSE;
-       }
+  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;
 }
 
 /* EOF */