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+// 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.
+
+// disassembler_x86.h: Basic x86 bytecode disassembler
+//
+// Provides a simple disassembler which wraps libdisasm. This allows simple
+// tests to be run against bytecode to test for various properties.
+//
+// Author: Cris Neckar
+
+#ifndef GOOGLE_BREAKPAD_PROCESSOR_DISASSEMBLER_X86_H_
+#define GOOGLE_BREAKPAD_PROCESSOR_DISASSEMBLER_X86_H_
+
+#include <stddef.h>
+#include <sys/types.h>
+
+#include "google_breakpad/common/breakpad_types.h"
+
+namespace libdis {
+#include "third_party/libdisasm/libdis.h"
+}
+
+namespace google_breakpad {
+
+enum {
+  DISX86_NONE =                 0x0,
+  DISX86_BAD_BRANCH_TARGET =    0x1,
+  DISX86_BAD_ARGUMENT_PASSED =  0x2,
+  DISX86_BAD_WRITE =            0x4,
+  DISX86_BAD_BLOCK_WRITE =      0x8,
+  DISX86_BAD_READ =             0x10,
+  DISX86_BAD_BLOCK_READ =       0x20,
+  DISX86_BAD_COMPARISON =       0x40
+};
+
+class DisassemblerX86 {
+  public:
+    // TODO(cdn): Modify this class to take a MemoryRegion instead of just
+    // a raw buffer. This will make it easier to use this on arbitrary
+    // minidumps without first copying out the code segment.
+    DisassemblerX86(const uint8_t *bytecode, uint32_t, uint32_t);
+    ~DisassemblerX86();
+
+    // This walks to the next instruction in the memory region and
+    // sets flags based on the type of instruction and previous state
+    // including any registers marked as bad through setBadRead()
+    // or setBadWrite(). This method can be called in a loop to
+    // disassemble until the end of a region.
+    uint32_t NextInstruction();
+
+    // Indicates whether the current disassembled instruction was valid.
+    bool currentInstructionValid() { return instr_valid_; }
+
+    // Returns the current instruction as defined in libdis.h,
+    // or NULL if the current instruction is not valid.
+    const libdis::x86_insn_t* currentInstruction() {
+      return instr_valid_ ? &current_instr_ : NULL;
+    }
+
+    // Returns the type of the current instruction as defined in libdis.h.
+    libdis::x86_insn_group currentInstructionGroup() {
+      return current_instr_.group;
+    }
+
+    // Indicates whether a return instruction has been encountered.
+    bool endOfBlock() { return end_of_block_; }
+
+    // The flags set so far for the disassembly.
+    uint16_t flags() { return flags_; }
+
+    // This sets an indicator that the register used to determine
+    // src or dest for the current instruction is tainted. These can
+    // be used after examining the current instruction to indicate,
+    // for example that a bad read or write occurred and the pointer
+    // stored in the register is currently invalid.
+    bool setBadRead();
+    bool setBadWrite();
+
+  protected:
+    const uint8_t *bytecode_;
+    uint32_t size_;
+    uint32_t virtual_address_;
+    uint32_t current_byte_offset_;
+    uint32_t current_inst_offset_;
+
+    bool instr_valid_;
+    libdis::x86_insn_t current_instr_;
+
+    // TODO(cdn): Maybe also track an expression's index register.
+    // ex: mov eax, [ebx + ecx]; ebx is base, ecx is index.
+    bool register_valid_;
+    libdis::x86_reg_t bad_register_;
+
+    bool pushed_bad_value_;
+    bool end_of_block_;
+
+    uint16_t flags_;
+};
+
+}  // namespace google_breakpad
+
+#endif  // GOOGLE_BREAKPAD_PROCESSOR_DISASSEMBLER_X86_H_