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+// -*- 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>
+
+// dwarf_cfi_to_module.h: Define the DwarfCFIToModule class, which
+// accepts parsed DWARF call frame info and adds it to a
+// google_breakpad::Module object, which can write that information to
+// a Breakpad symbol file.
+
+#ifndef COMMON_LINUX_DWARF_CFI_TO_MODULE_H
+#define COMMON_LINUX_DWARF_CFI_TO_MODULE_H
+
+#include <assert.h>
+#include <stdio.h>
+
+#include <set>
+#include <string>
+#include <vector>
+
+#include "common/module.h"
+#include "common/dwarf/dwarf2reader.h"
+#include "common/using_std_string.h"
+
+namespace google_breakpad {
+
+using dwarf2reader::CallFrameInfo;
+using google_breakpad::Module;
+using std::set;
+using std::vector;
+
+// A class that accepts parsed call frame information from the DWARF
+// CFI parser and populates a google_breakpad::Module object with the
+// contents.
+class DwarfCFIToModule: public CallFrameInfo::Handler {
+ public:
+
+ // DwarfCFIToModule uses an instance of this class to report errors
+ // detected while converting DWARF CFI to Breakpad STACK CFI records.
+ class Reporter {
+ public:
+ // Create a reporter that writes messages to the standard error
+ // stream. FILE is the name of the file we're processing, and
+ // SECTION is the name of the section within that file that we're
+ // looking at (.debug_frame, .eh_frame, etc.).
+ Reporter(const string &file, const string &section)
+ : file_(file), section_(section) { }
+ virtual ~Reporter() { }
+
+ // The DWARF CFI entry at OFFSET cites register REG, but REG is not
+ // covered by the vector of register names passed to the
+ // DwarfCFIToModule constructor, nor does it match the return
+ // address column number for this entry.
+ virtual void UnnamedRegister(size_t offset, int reg);
+
+ // The DWARF CFI entry at OFFSET says that REG is undefined, but the
+ // Breakpad symbol file format cannot express this.
+ virtual void UndefinedNotSupported(size_t offset, const string &reg);
+
+ // The DWARF CFI entry at OFFSET says that REG uses a DWARF
+ // expression to find its value, but DwarfCFIToModule is not
+ // capable of translating DWARF expressions to Breakpad postfix
+ // expressions.
+ virtual void ExpressionsNotSupported(size_t offset, const string &reg);
+
+ protected:
+ string file_, section_;
+ };
+
+ // Register name tables. If TABLE is a vector returned by one of these
+ // functions, then TABLE[R] is the name of the register numbered R in
+ // DWARF call frame information.
+ class RegisterNames {
+ public:
+ // Intel's "x86" or IA-32.
+ static vector<string> I386();
+
+ // AMD x86_64, AMD64, Intel EM64T, or Intel 64
+ static vector<string> X86_64();
+
+ // ARM.
+ static vector<string> ARM();
+
+ private:
+ // Given STRINGS, an array of C strings with SIZE elements, return an
+ // equivalent vector<string>.
+ static vector<string> MakeVector(const char * const *strings, size_t size);
+ };
+
+ // Create a handler for the dwarf2reader::CallFrameInfo parser that
+ // records the stack unwinding information it receives in MODULE.
+ //
+ // Use REGISTER_NAMES[I] as the name of register number I; *this
+ // keeps a reference to the vector, so the vector should remain
+ // alive for as long as the DwarfCFIToModule does.
+ //
+ // Use REPORTER for reporting problems encountered in the conversion
+ // process.
+ DwarfCFIToModule(Module *module, const vector<string> &register_names,
+ Reporter *reporter)
+ : module_(module), register_names_(register_names), reporter_(reporter),
+ entry_(NULL), return_address_(-1), cfa_name_(".cfa"), ra_name_(".ra") {
+ }
+ virtual ~DwarfCFIToModule() { delete entry_; }
+
+ virtual bool Entry(size_t offset, uint64 address, uint64 length,
+ uint8 version, const string &augmentation,
+ unsigned return_address);
+ virtual bool UndefinedRule(uint64 address, int reg);
+ virtual bool SameValueRule(uint64 address, int reg);
+ virtual bool OffsetRule(uint64 address, int reg,
+ int base_register, long offset);
+ virtual bool ValOffsetRule(uint64 address, int reg,
+ int base_register, long offset);
+ virtual bool RegisterRule(uint64 address, int reg, int base_register);
+ virtual bool ExpressionRule(uint64 address, int reg,
+ const string &expression);
+ virtual bool ValExpressionRule(uint64 address, int reg,
+ const string &expression);
+ virtual bool End();
+
+ private:
+ // Return the name to use for register REG.
+ string RegisterName(int i);
+
+ // Record RULE for register REG at ADDRESS.
+ void Record(Module::Address address, int reg, const string &rule);
+
+ // The module to which we should add entries.
+ Module *module_;
+
+ // Map from register numbers to register names.
+ const vector<string> &register_names_;
+
+ // The reporter to use to report problems.
+ Reporter *reporter_;
+
+ // The current entry we're constructing.
+ Module::StackFrameEntry *entry_;
+
+ // The section offset of the current frame description entry, for
+ // use in error messages.
+ size_t entry_offset_;
+
+ // The return address column for that entry.
+ unsigned return_address_;
+
+ // The names of the return address and canonical frame address. Putting
+ // these here instead of using string literals allows us to share their
+ // texts in reference-counted std::string implementations (all the
+ // popular ones). Many, many rules cite these strings.
+ string cfa_name_, ra_name_;
+
+ // A set of strings used by this CFI. Before storing a string in one of
+ // our data structures, insert it into this set, and then use the string
+ // from the set.
+ //
+ // Because std::string uses reference counting internally, simply using
+ // strings from this set, even if passed by value, assigned, or held
+ // directly in structures and containers (map<string, ...>, for example),
+ // causes those strings to share a single instance of each distinct piece
+ // of text.
+ set<string> common_strings_;
+};
+
+} // namespace google_breakpad
+
+#endif // COMMON_LINUX_DWARF_CFI_TO_MODULE_H