* Added breakpad support for Linux.

thirdparty/breakpad/processor/cfi_frame_info-inl.h

@@ -0,0 +1,119 @@
+// -*- mode: C++ -*-
+
+// 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.
+
+// Original author: Jim Blandy <jimb@mozilla.com> <jimb@red-bean.com>
+
+// cfi_frame_info-inl.h: Definitions for cfi_frame_info.h inlined functions.
+
+#ifndef PROCESSOR_CFI_FRAME_INFO_INL_H_
+#define PROCESSOR_CFI_FRAME_INFO_INL_H_
+
+#include <string.h>
+
+namespace google_breakpad {
+
+template <typename RegisterType, class RawContextType>
+bool SimpleCFIWalker<RegisterType, RawContextType>::FindCallerRegisters(
+    const MemoryRegion &memory,
+    const CFIFrameInfo &cfi_frame_info,
+    const RawContextType &callee_context,
+    int callee_validity,
+    RawContextType *caller_context,
+    int *caller_validity) const {
+  typedef CFIFrameInfo::RegisterValueMap<RegisterType> ValueMap;
+  ValueMap callee_registers;
+  ValueMap caller_registers;
+  // Just for brevity.
+  typename ValueMap::const_iterator caller_none = caller_registers.end();
+
+  // Populate callee_registers with register values from callee_context.
+  for (size_t i = 0; i < map_size_; i++) {
+    const RegisterSet &r = register_map_[i];
+    if (callee_validity & r.validity_flag)
+      callee_registers[r.name] = callee_context.*r.context_member;
+  }
+
+  // Apply the rules, and see what register values they yield.
+  if (!cfi_frame_info.FindCallerRegs<RegisterType>(callee_registers, memory,
+                                                   &caller_registers))
+    return false;
+
+  // Populate *caller_context with the values the rules placed in
+  // caller_registers.
+  memset(caller_context, 0xda, sizeof(*caller_context));
+  *caller_validity = 0;
+  for (size_t i = 0; i < map_size_; i++) {
+    const RegisterSet &r = register_map_[i];
+    typename ValueMap::const_iterator caller_entry;
+
+    // Did the rules provide a value for this register by its name?
+    caller_entry = caller_registers.find(r.name);
+    if (caller_entry != caller_none) {
+      caller_context->*r.context_member = caller_entry->second;
+      *caller_validity |= r.validity_flag;
+      continue;
+    }
+
+    // Did the rules provide a value for this register under its
+    // alternate name?
+    if (r.alternate_name) {
+      caller_entry = caller_registers.find(r.alternate_name);
+      if (caller_entry != caller_none) {
+        caller_context->*r.context_member = caller_entry->second;
+        *caller_validity |= r.validity_flag;
+        continue;
+      }
+    }
+
+    // Is this a callee-saves register? The walker assumes that these
+    // still hold the caller's value if the CFI doesn't mention them.
+    //
+    // Note that other frame walkers may fail to recover callee-saves
+    // registers; for example, the x86 "traditional" strategy only
+    // recovers %eip, %esp, and %ebp, even though %ebx, %esi, and %edi
+    // are callee-saves, too. It is not correct to blindly set the
+    // valid bit for all callee-saves registers, without first
+    // checking its validity bit in the callee.
+    if (r.callee_saves && (callee_validity & r.validity_flag) != 0) {
+      caller_context->*r.context_member = callee_context.*r.context_member;
+      *caller_validity |= r.validity_flag;
+      continue;
+    }
+
+    // Otherwise, the register's value is unknown.
+  }
+
+  return true;
+}
+
+} // namespace google_breakpad
+
+#endif // PROCESSOR_CFI_FRAME_INFO_INL_H_