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+// Copyright 2007 Google LLC
+//
+// 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 LLC 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.
+
+//  dynamic_images.h
+//
+//    Implements most of the function of the dyld API, but allowing an
+//    arbitrary task to be introspected, unlike the dyld API which
+//    only allows operation on the current task.  The current implementation
+//    is limited to use by 32-bit tasks.
+
+#ifndef CLIENT_MAC_HANDLER_DYNAMIC_IMAGES_H__
+#define CLIENT_MAC_HANDLER_DYNAMIC_IMAGES_H__
+
+#include <mach/mach.h>
+#include <mach-o/dyld.h>
+#include <mach-o/loader.h>
+#include <sys/types.h>
+
+#include <string>
+#include <vector>
+
+#include "mach_vm_compat.h"
+
+namespace google_breakpad {
+
+using std::string;
+using std::vector;
+
+//==============================================================================
+// The memory layout of this struct matches the dyld_image_info struct
+// defined in "dyld_gdb.h" in the darwin source.
+typedef struct dyld_image_info32 {
+  uint32_t                   load_address_;  // struct mach_header*
+  uint32_t                   file_path_;     // char*
+  uint32_t                   file_mod_date_;
+} dyld_image_info32;
+
+typedef struct dyld_image_info64 {
+  uint64_t                   load_address_;  // struct mach_header*
+  uint64_t                   file_path_;     // char*
+  uint64_t                   file_mod_date_;
+} dyld_image_info64;
+
+//==============================================================================
+// This is as defined in "dyld_gdb.h" in the darwin source.
+// _dyld_all_image_infos (in dyld) is a structure of this type
+// which will be used to determine which dynamic code has been loaded.
+typedef struct dyld_all_image_infos32 {
+  uint32_t                      version;  // == 1 in Mac OS X 10.4
+  uint32_t                      infoArrayCount;
+  uint32_t                      infoArray;  // const struct dyld_image_info*
+  uint32_t                      notification;
+  bool                          processDetachedFromSharedRegion;
+} dyld_all_image_infos32;
+
+typedef struct dyld_all_image_infos64 {
+  uint32_t                      version;  // == 1 in Mac OS X 10.4
+  uint32_t                      infoArrayCount;
+  uint64_t                      infoArray;  // const struct dyld_image_info*
+  uint64_t                      notification;
+  bool                          processDetachedFromSharedRegion;
+} dyld_all_image_infos64;
+
+// some typedefs to isolate 64/32 bit differences
+#ifdef __LP64__
+typedef mach_header_64 breakpad_mach_header;
+typedef segment_command_64 breakpad_mach_segment_command;
+#else
+typedef mach_header breakpad_mach_header;
+typedef segment_command breakpad_mach_segment_command;
+#endif
+
+// Helper functions to deal with 32-bit/64-bit Mach-O differences.
+class DynamicImage;
+template<typename MachBits>
+bool FindTextSection(DynamicImage& image);
+
+template<typename MachBits>
+uint32_t GetFileTypeFromHeader(DynamicImage& image);
+
+//==============================================================================
+// Represents a single dynamically loaded mach-o image
+class DynamicImage {
+ public:
+  DynamicImage(uint8_t* header,     // data is copied
+               size_t header_size,  // includes load commands
+               uint64_t load_address,
+               string file_path,
+               uintptr_t image_mod_date,
+               mach_port_t task,
+               cpu_type_t cpu_type)
+    : header_(header, header + header_size),
+      header_size_(header_size),
+      load_address_(load_address),
+      vmaddr_(0),
+      vmsize_(0),
+      slide_(0),
+      version_(0),
+      file_path_(file_path),
+      file_mod_date_(image_mod_date),
+      task_(task),
+      cpu_type_(cpu_type) {
+    CalculateMemoryAndVersionInfo();
+  }
+
+  // Size of mach_header plus load commands
+  size_t GetHeaderSize() const {return header_.size();}
+
+  // Full path to mach-o binary
+  string GetFilePath() {return file_path_;}
+
+  uint64_t GetModDate() const {return file_mod_date_;}
+
+  // Actual address where the image was loaded
+  uint64_t GetLoadAddress() const {return load_address_;}
+
+  // Address where the image should be loaded
+  mach_vm_address_t GetVMAddr() const {return vmaddr_;}
+
+  // Difference between GetLoadAddress() and GetVMAddr()
+  ptrdiff_t GetVMAddrSlide() const {return slide_;}
+
+  // Size of the image
+  mach_vm_size_t GetVMSize() const {return vmsize_;}
+
+  // Task owning this loaded image
+  mach_port_t GetTask() {return task_;}
+
+  // CPU type of the task
+  cpu_type_t GetCPUType() {return cpu_type_;}
+
+  // filetype from the Mach-O header.
+  uint32_t GetFileType();
+
+  // Return true if the task is a 64-bit architecture.
+  bool Is64Bit() { return (GetCPUType() & CPU_ARCH_ABI64) == CPU_ARCH_ABI64; }
+
+  uint32_t GetVersion() {return version_;}
+  // For sorting
+  bool operator<(const DynamicImage& inInfo) {
+    return GetLoadAddress() < inInfo.GetLoadAddress();
+  }
+
+  // Sanity checking
+  bool IsValid() {return GetVMSize() != 0;}
+
+ private:
+  DynamicImage(const DynamicImage&);
+  DynamicImage& operator=(const DynamicImage&);
+
+  friend class DynamicImages;
+  template<typename MachBits>
+  friend bool FindTextSection(DynamicImage& image);
+  template<typename MachBits>
+  friend uint32_t GetFileTypeFromHeader(DynamicImage& image);
+
+  // Initializes vmaddr_, vmsize_, and slide_
+  void CalculateMemoryAndVersionInfo();
+
+  const vector<uint8_t>   header_;        // our local copy of the header
+  size_t                  header_size_;    // mach_header plus load commands
+  uint64_t                load_address_;   // base address image is mapped into
+  mach_vm_address_t       vmaddr_;
+  mach_vm_size_t          vmsize_;
+  ptrdiff_t               slide_;
+  uint32_t                version_;        // Dylib version
+  string                  file_path_;     // path dyld used to load the image
+  uintptr_t               file_mod_date_;  // time_t of image file
+
+  mach_port_t             task_;
+  cpu_type_t              cpu_type_;        // CPU type of task_
+};
+
+//==============================================================================
+// DynamicImageRef is just a simple wrapper for a pointer to
+// DynamicImage.  The reason we use it instead of a simple typedef is so
+// that we can use stl::sort() on a vector of DynamicImageRefs
+// and simple class pointers can't implement operator<().
+//
+class DynamicImageRef {
+ public:
+  explicit DynamicImageRef(DynamicImage* inP) : p(inP) {}
+  // The copy constructor is required by STL
+  DynamicImageRef(const DynamicImageRef& inRef) = default;
+  DynamicImageRef& operator=(const DynamicImageRef& inRef) = default;
+
+  bool operator<(const DynamicImageRef& inRef) const {
+    return (*const_cast<DynamicImageRef*>(this)->p)
+      < (*const_cast<DynamicImageRef&>(inRef).p);
+  }
+
+  bool operator==(const DynamicImageRef& inInfo) const {
+    return (*const_cast<DynamicImageRef*>(this)->p).GetLoadAddress() ==
+        (*const_cast<DynamicImageRef&>(inInfo)).GetLoadAddress();
+  }
+
+  // Be just like DynamicImage*
+  DynamicImage* operator->() {return p;}
+  operator DynamicImage*() {return p;}
+
+ private:
+  DynamicImage* p;
+};
+
+// Helper function to deal with 32-bit/64-bit Mach-O differences.
+class DynamicImages;
+template<typename MachBits>
+void ReadImageInfo(DynamicImages& images, uint64_t image_list_address);
+
+//==============================================================================
+// An object of type DynamicImages may be created to allow introspection of
+// an arbitrary task's dynamically loaded mach-o binaries.  This makes the
+// assumption that the current task has send rights to the target task.
+class DynamicImages {
+ public:
+  explicit DynamicImages(mach_port_t task);
+
+  ~DynamicImages() {
+    for (int i = 0; i < GetImageCount(); ++i) {
+      delete image_list_[i];
+    }
+  }
+
+  // Returns the number of dynamically loaded mach-o images.
+  int GetImageCount() const {return static_cast<int>(image_list_.size());}
+
+  // Returns an individual image.
+  DynamicImage* GetImage(int i) {
+    if (i < (int)image_list_.size()) {
+      return image_list_[i];
+    }
+    return NULL;
+  }
+
+  // Returns the image corresponding to the main executable.
+  DynamicImage* GetExecutableImage();
+  int GetExecutableImageIndex();
+
+  // Returns the task which we're looking at.
+  mach_port_t GetTask() const {return task_;}
+
+  // CPU type of the task
+  cpu_type_t GetCPUType() {return cpu_type_;}
+
+  // Return true if the task is a 64-bit architecture.
+  bool Is64Bit() { return (GetCPUType() & CPU_ARCH_ABI64) == CPU_ARCH_ABI64; }
+
+  // Determine the CPU type of the task being dumped.
+  static cpu_type_t DetermineTaskCPUType(task_t task);
+
+  // Get the native CPU type of this task.
+  static cpu_type_t GetNativeCPUType() {
+#if defined(__i386__)
+    return CPU_TYPE_I386;
+#elif defined(__x86_64__)
+    return CPU_TYPE_X86_64;
+#elif defined(__ppc__)
+    return CPU_TYPE_POWERPC;
+#elif defined(__ppc64__)
+    return CPU_TYPE_POWERPC64;
+#elif defined(__arm__)
+    return CPU_TYPE_ARM;
+#elif defined(__aarch64__)
+    return CPU_TYPE_ARM64;
+#else
+#error "GetNativeCPUType not implemented for this architecture"
+#endif
+  }
+
+ private:
+  template<typename MachBits>
+  friend void ReadImageInfo(DynamicImages& images, uint64_t image_list_address);
+
+  bool IsOurTask() {return task_ == mach_task_self();}
+
+  // Initialization
+  void ReadImageInfoForTask();
+  uint64_t GetDyldAllImageInfosPointer();
+
+  mach_port_t              task_;
+  cpu_type_t               cpu_type_;  // CPU type of task_
+  vector<DynamicImageRef>  image_list_;
+};
+
+// Fill bytes with the contents of memory at a particular
+// location in another task.
+kern_return_t ReadTaskMemory(task_port_t target_task,
+                             const uint64_t address,
+                             size_t length,
+                             vector<uint8_t>& bytes);
+
+}   // namespace google_breakpad
+
+#endif // CLIENT_MAC_HANDLER_DYNAMIC_IMAGES_H__