* Added breakpad support for Linux.

thirdparty/breakpad/processor/range_map-inl.h

@@ -0,0 +1,210 @@
+// Copyright (c) 2010 Google Inc.
+// All rights reserved.
+//
+// Redistribution and use in source and binary forms, with or without
+// modification, are permitted provided that the following conditions are
+// met:
+//
+//     * Redistributions of source code must retain the above copyright
+// notice, this list of conditions and the following disclaimer.
+//     * Redistributions in binary form must reproduce the above
+// copyright notice, this list of conditions and the following disclaimer
+// in the documentation and/or other materials provided with the
+// distribution.
+//     * Neither the name of Google Inc. nor the names of its
+// contributors may be used to endorse or promote products derived from
+// this software without specific prior written permission.
+//
+// THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
+// "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
+// LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
+// A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
+// OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
+// SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
+// LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
+// DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
+// THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
+// (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
+// OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
+
+// range_map-inl.h: Range map implementation.
+//
+// See range_map.h for documentation.
+//
+// Author: Mark Mentovai
+
+#ifndef PROCESSOR_RANGE_MAP_INL_H__
+#define PROCESSOR_RANGE_MAP_INL_H__
+
+
+#include <assert.h>
+
+#include "processor/range_map.h"
+#include "processor/logging.h"
+
+
+namespace google_breakpad {
+
+
+template<typename AddressType, typename EntryType>
+bool RangeMap<AddressType, EntryType>::StoreRange(const AddressType &base,
+                                                  const AddressType &size,
+                                                  const EntryType &entry) {
+  AddressType high = base + size - 1;
+
+  // Check for undersize or overflow.
+  if (size <= 0 || high < base) {
+    // The processor will hit this case too frequently with common symbol
+    // files in the size == 0 case, which is more suited to a DEBUG channel.
+    // Filter those out since there's no DEBUG channel at the moment.
+    BPLOG_IF(INFO, size != 0) << "StoreRange failed, " << HexString(base) <<
+                                 "+" << HexString(size) << ", " <<
+                                 HexString(high);
+    return false;
+  }
+
+  // Ensure that this range does not overlap with another one already in the
+  // map.
+  MapConstIterator iterator_base = map_.lower_bound(base);
+  MapConstIterator iterator_high = map_.lower_bound(high);
+
+  if (iterator_base != iterator_high) {
+    // Some other range begins in the space used by this range.  It may be
+    // contained within the space used by this range, or it may extend lower.
+    // Regardless, it is an error.
+    AddressType other_base = iterator_base->second.base();
+    AddressType other_size = iterator_base->first - other_base + 1;
+    BPLOG(INFO) << "StoreRange failed, an existing range is contained by or "
+                   "extends lower than the new range: new " <<
+                   HexString(base) << "+" << HexString(size) << ", existing " <<
+                   HexString(other_base) << "+" << HexString(other_size);
+    return false;
+  }
+
+  if (iterator_high != map_.end()) {
+    if (iterator_high->second.base() <= high) {
+      // The range above this one overlaps with this one.  It may fully
+      // contain this range, or it may begin within this range and extend
+      // higher.  Regardless, it's an error.
+      AddressType other_base = iterator_high->second.base();
+      AddressType other_size = iterator_high->first - other_base + 1;
+      BPLOG(INFO) << "StoreRange failed, an existing range contains or "
+                     "extends higher than the new range: new " <<
+                     HexString(base) << "+" << HexString(size) <<
+                     ", existing " <<
+                     HexString(other_base) << "+" << HexString(other_size);
+      return false;
+    }
+  }
+
+  // Store the range in the map by its high address, so that lower_bound can
+  // be used to quickly locate a range by address.
+  map_.insert(MapValue(high, Range(base, entry)));
+  return true;
+}
+
+
+template<typename AddressType, typename EntryType>
+bool RangeMap<AddressType, EntryType>::RetrieveRange(
+    const AddressType &address, EntryType *entry,
+    AddressType *entry_base, AddressType *entry_size) const {
+  BPLOG_IF(ERROR, !entry) << "RangeMap::RetrieveRange requires |entry|";
+  assert(entry);
+
+  MapConstIterator iterator = map_.lower_bound(address);
+  if (iterator == map_.end())
+    return false;
+
+  // The map is keyed by the high address of each range, so |address| is
+  // guaranteed to be lower than the range's high address.  If |range| is
+  // not directly preceded by another range, it's possible for address to
+  // be below the range's low address, though.  When that happens, address
+  // references something not within any range, so return false.
+  if (address < iterator->second.base())
+    return false;
+
+  *entry = iterator->second.entry();
+  if (entry_base)
+    *entry_base = iterator->second.base();
+  if (entry_size)
+    *entry_size = iterator->first - iterator->second.base() + 1;
+
+  return true;
+}
+
+
+template<typename AddressType, typename EntryType>
+bool RangeMap<AddressType, EntryType>::RetrieveNearestRange(
+    const AddressType &address, EntryType *entry,
+    AddressType *entry_base, AddressType *entry_size) const {
+  BPLOG_IF(ERROR, !entry) << "RangeMap::RetrieveNearestRange requires |entry|";
+  assert(entry);
+
+  // If address is within a range, RetrieveRange can handle it.
+  if (RetrieveRange(address, entry, entry_base, entry_size))
+    return true;
+
+  // upper_bound gives the first element whose key is greater than address,
+  // but we want the first element whose key is less than or equal to address.
+  // Decrement the iterator to get there, but not if the upper_bound already
+  // points to the beginning of the map - in that case, address is lower than
+  // the lowest stored key, so return false.
+  MapConstIterator iterator = map_.upper_bound(address);
+  if (iterator == map_.begin())
+    return false;
+  --iterator;
+
+  *entry = iterator->second.entry();
+  if (entry_base)
+    *entry_base = iterator->second.base();
+  if (entry_size)
+    *entry_size = iterator->first - iterator->second.base() + 1;
+
+  return true;
+}
+
+
+template<typename AddressType, typename EntryType>
+bool RangeMap<AddressType, EntryType>::RetrieveRangeAtIndex(
+    int index, EntryType *entry,
+    AddressType *entry_base, AddressType *entry_size) const {
+  BPLOG_IF(ERROR, !entry) << "RangeMap::RetrieveRangeAtIndex requires |entry|";
+  assert(entry);
+
+  if (index >= GetCount()) {
+    BPLOG(ERROR) << "Index out of range: " << index << "/" << GetCount();
+    return false;
+  }
+
+  // Walk through the map.  Although it's ordered, it's not a vector, so it
+  // can't be addressed directly by index.
+  MapConstIterator iterator = map_.begin();
+  for (int this_index = 0; this_index < index; ++this_index)
+    ++iterator;
+
+  *entry = iterator->second.entry();
+  if (entry_base)
+    *entry_base = iterator->second.base();
+  if (entry_size)
+    *entry_size = iterator->first - iterator->second.base() + 1;
+
+  return true;
+}
+
+
+template<typename AddressType, typename EntryType>
+int RangeMap<AddressType, EntryType>::GetCount() const {
+  return map_.size();
+}
+
+
+template<typename AddressType, typename EntryType>
+void RangeMap<AddressType, EntryType>::Clear() {
+  map_.clear();
+}
+
+
+}  // namespace google_breakpad
+
+
+#endif  // PROCESSOR_RANGE_MAP_INL_H__