/thirdparty/breakpad/common/dwarf/dwarf2diehandler.cc
http://github.com/tomahawk-player/tomahawk · C++ · 196 lines · 118 code · 20 blank · 58 comment · 31 complexity · 11e0e9ad3ee2e4459334a17c9dd4fbaf MD5 · raw file
- // 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>
- // dwarf2diehandler.cc: Implement the dwarf2reader::DieDispatcher class.
- // See dwarf2diehandler.h for details.
- #include "common/dwarf/dwarf2diehandler.h"
- #include <assert.h>
- namespace dwarf2reader {
- DIEDispatcher::~DIEDispatcher() {
- while (!die_handlers_.empty()) {
- HandlerStack &entry = die_handlers_.top();
- if (entry.handler_ != root_handler_)
- delete entry.handler_;
- die_handlers_.pop();
- }
- }
- bool DIEDispatcher::StartCompilationUnit(uint64 offset, uint8 address_size,
- uint8 offset_size, uint64 cu_length,
- uint8 dwarf_version) {
- return root_handler_->StartCompilationUnit(offset, address_size,
- offset_size, cu_length,
- dwarf_version);
- }
- bool DIEDispatcher::StartDIE(uint64 offset, enum DwarfTag tag,
- const AttributeList& attrs) {
- // The stack entry for the parent of this DIE, if there is one.
- HandlerStack *parent = die_handlers_.empty() ? NULL : &die_handlers_.top();
- // Does this call indicate that we're done receiving the parent's
- // attributes' values? If so, call its EndAttributes member function.
- if (parent && parent->handler_ && !parent->reported_attributes_end_) {
- parent->reported_attributes_end_ = true;
- if (!parent->handler_->EndAttributes()) {
- // Finish off this handler now. and edit *PARENT to indicate that
- // we don't want to visit any of the children.
- parent->handler_->Finish();
- if (parent->handler_ != root_handler_)
- delete parent->handler_;
- parent->handler_ = NULL;
- return false;
- }
- }
- // Find a handler for this DIE.
- DIEHandler *handler;
- if (parent) {
- if (parent->handler_)
- // Ask the parent to find a handler.
- handler = parent->handler_->FindChildHandler(offset, tag, attrs);
- else
- // No parent handler means we're not interested in any of our
- // children.
- handler = NULL;
- } else {
- // This is the root DIE. For a non-root DIE, the parent's handler
- // decides whether to visit it, but the root DIE has no parent
- // handler, so we have a special method on the root DIE handler
- // itself to decide.
- if (root_handler_->StartRootDIE(offset, tag, attrs))
- handler = root_handler_;
- else
- handler = NULL;
- }
- // Push a handler stack entry for this new handler. As an
- // optimization, we don't push NULL-handler entries on top of other
- // NULL-handler entries; we just let the oldest such entry stand for
- // the whole subtree.
- if (handler || !parent || parent->handler_) {
- HandlerStack entry;
- entry.offset_ = offset;
- entry.handler_ = handler;
- entry.reported_attributes_end_ = false;
- die_handlers_.push(entry);
- }
- return handler != NULL;
- }
- void DIEDispatcher::EndDIE(uint64 offset) {
- assert(!die_handlers_.empty());
- HandlerStack *entry = &die_handlers_.top();
- if (entry->handler_) {
- // This entry had better be the handler for this DIE.
- assert(entry->offset_ == offset);
- // If a DIE has no children, this EndDIE call indicates that we're
- // done receiving its attributes' values.
- if (!entry->reported_attributes_end_)
- entry->handler_->EndAttributes(); // Ignore return value: no children.
- entry->handler_->Finish();
- if (entry->handler_ != root_handler_)
- delete entry->handler_;
- } else {
- // If this DIE is within a tree we're ignoring, then don't pop the
- // handler stack: that entry stands for the whole tree.
- if (entry->offset_ != offset)
- return;
- }
- die_handlers_.pop();
- }
- void DIEDispatcher::ProcessAttributeUnsigned(uint64 offset,
- enum DwarfAttribute attr,
- enum DwarfForm form,
- uint64 data) {
- HandlerStack ¤t = die_handlers_.top();
- // This had better be an attribute of the DIE we were meant to handle.
- assert(offset == current.offset_);
- current.handler_->ProcessAttributeUnsigned(attr, form, data);
- }
- void DIEDispatcher::ProcessAttributeSigned(uint64 offset,
- enum DwarfAttribute attr,
- enum DwarfForm form,
- int64 data) {
- HandlerStack ¤t = die_handlers_.top();
- // This had better be an attribute of the DIE we were meant to handle.
- assert(offset == current.offset_);
- current.handler_->ProcessAttributeSigned(attr, form, data);
- }
- void DIEDispatcher::ProcessAttributeReference(uint64 offset,
- enum DwarfAttribute attr,
- enum DwarfForm form,
- uint64 data) {
- HandlerStack ¤t = die_handlers_.top();
- // This had better be an attribute of the DIE we were meant to handle.
- assert(offset == current.offset_);
- current.handler_->ProcessAttributeReference(attr, form, data);
- }
- void DIEDispatcher::ProcessAttributeBuffer(uint64 offset,
- enum DwarfAttribute attr,
- enum DwarfForm form,
- const char* data,
- uint64 len) {
- HandlerStack ¤t = die_handlers_.top();
- // This had better be an attribute of the DIE we were meant to handle.
- assert(offset == current.offset_);
- current.handler_->ProcessAttributeBuffer(attr, form, data, len);
- }
- void DIEDispatcher::ProcessAttributeString(uint64 offset,
- enum DwarfAttribute attr,
- enum DwarfForm form,
- const std::string& data) {
- HandlerStack ¤t = die_handlers_.top();
- // This had better be an attribute of the DIE we were meant to handle.
- assert(offset == current.offset_);
- current.handler_->ProcessAttributeString(attr, form, data);
- }
- void DIEDispatcher::ProcessAttributeSignature(uint64 offset,
- enum DwarfAttribute attr,
- enum DwarfForm form,
- uint64 signature) {
- HandlerStack ¤t = die_handlers_.top();
- // This had better be an attribute of the DIE we were meant to handle.
- assert(offset == current.offset_);
- current.handler_->ProcessAttributeSignature(attr, form, signature);
- }
- } // namespace dwarf2reader