// 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.

// stackwalk_common.cc: Module shared by the {micro,mini}dump_stackwalck
// executables to print the content of dumps (w/ stack traces) on the console.
//
// Author: Mark Mentovai

#include "processor/stackwalk_common.h"

#include <assert.h>
#include <stdlib.h>
#include <string.h>

#include <string>
#include <vector>

#include "common/stdio_wrapper.h"
#include "common/using_std_string.h"
#include "google_breakpad/processor/call_stack.h"
#include "google_breakpad/processor/code_module.h"
#include "google_breakpad/processor/code_modules.h"
#include "google_breakpad/processor/process_state.h"
#include "google_breakpad/processor/source_line_resolver_interface.h"
#include "google_breakpad/processor/stack_frame_cpu.h"
#include "processor/logging.h"
#include "processor/pathname_stripper.h"

namespace google_breakpad {

namespace {

using std::vector;

// Separator character for machine readable output.
static const char kOutputSeparator = '|';

// PrintRegister prints a register's name and value to stdout.  It will
// print four registers on a line.  For the first register in a set,
// pass 0 for |start_col|.  For registers in a set, pass the most recent
// return value of PrintRegister.
// The caller is responsible for printing the final newline after a set
// of registers is completely printed, regardless of the number of calls
// to PrintRegister.
static const int kMaxWidth = 80;  // optimize for an 80-column terminal
static int PrintRegister(const char* name, uint32_t value, int start_col) {
  char buffer[64];
  snprintf(buffer, sizeof(buffer), " %5s = 0x%08x", name, value);

  if (start_col + static_cast<ssize_t>(strlen(buffer)) > kMaxWidth) {
    start_col = 0;
    printf("\n ");
  }
  fputs(buffer, stdout);

  return start_col + strlen(buffer);
}

// PrintRegister64 does the same thing, but for 64-bit registers.
static int PrintRegister64(const char* name, uint64_t value, int start_col) {
  char buffer[64];
  snprintf(buffer, sizeof(buffer), " %5s = 0x%016" PRIx64 , name, value);

  if (start_col + static_cast<ssize_t>(strlen(buffer)) > kMaxWidth) {
    start_col = 0;
    printf("\n ");
  }
  fputs(buffer, stdout);

  return start_col + strlen(buffer);
}

// StripSeparator takes a string |original| and returns a copy
// of the string with all occurences of |kOutputSeparator| removed.
static string StripSeparator(const string& original) {
  string result = original;
  string::size_type position = 0;
  while ((position = result.find(kOutputSeparator, position)) != string::npos) {
    result.erase(position, 1);
  }
  position = 0;
  while ((position = result.find('\n', position)) != string::npos) {
    result.erase(position, 1);
  }
  return result;
}

// PrintStackContents prints the stack contents of the current frame to stdout.
static void PrintStackContents(const string& indent,
                               const StackFrame* frame,
                               const StackFrame* prev_frame,
                               const string& cpu,
                               const MemoryRegion* memory,
                               const CodeModules* modules,
                               SourceLineResolverInterface* resolver) {
  // Find stack range.
  int word_length = 0;
  uint64_t stack_begin = 0, stack_end = 0;
  if (cpu == "x86") {
    word_length = 4;
    const StackFrameX86* frame_x86 = static_cast<const StackFrameX86*>(frame);
    const StackFrameX86* prev_frame_x86 =
        static_cast<const StackFrameX86*>(prev_frame);
    if ((frame_x86->context_validity & StackFrameX86::CONTEXT_VALID_ESP) &&
        (prev_frame_x86->context_validity & StackFrameX86::CONTEXT_VALID_ESP)) {
      stack_begin = frame_x86->context.esp;
      stack_end = prev_frame_x86->context.esp;
    }
  } else if (cpu == "amd64") {
    word_length = 8;
    const StackFrameAMD64* frame_amd64 =
        static_cast<const StackFrameAMD64*>(frame);
    const StackFrameAMD64* prev_frame_amd64 =
        static_cast<const StackFrameAMD64*>(prev_frame);
    if ((frame_amd64->context_validity & StackFrameAMD64::CONTEXT_VALID_RSP) &&
        (prev_frame_amd64->context_validity &
         StackFrameAMD64::CONTEXT_VALID_RSP)) {
      stack_begin = frame_amd64->context.rsp;
      stack_end = prev_frame_amd64->context.rsp;
    }
  } else if (cpu == "arm") {
    word_length = 4;
    const StackFrameARM* frame_arm = static_cast<const StackFrameARM*>(frame);
    const StackFrameARM* prev_frame_arm =
        static_cast<const StackFrameARM*>(prev_frame);
    if ((frame_arm->context_validity & StackFrameARM::CONTEXT_VALID_SP) &&
        (prev_frame_arm->context_validity & StackFrameARM::CONTEXT_VALID_SP)) {
      stack_begin = frame_arm->context.iregs[13];
      stack_end = prev_frame_arm->context.iregs[13];
    }
  } else if (cpu == "arm64") {
    word_length = 8;
    const StackFrameARM64* frame_arm64 =
        static_cast<const StackFrameARM64*>(frame);
    const StackFrameARM64* prev_frame_arm64 =
        static_cast<const StackFrameARM64*>(prev_frame);
    if ((frame_arm64->context_validity & StackFrameARM64::CONTEXT_VALID_SP) &&
        (prev_frame_arm64->context_validity &
         StackFrameARM64::CONTEXT_VALID_SP)) {
      stack_begin = frame_arm64->context.iregs[31];
      stack_end = prev_frame_arm64->context.iregs[31];
    }
  }
  if (!word_length || !stack_begin || !stack_end)
    return;

  // Print stack contents.
  printf("\n%sStack contents:", indent.c_str());
  for(uint64_t address = stack_begin; address < stack_end; ) {
    // Print the start address of this row.
    if (word_length == 4)
      printf("\n%s %08x", indent.c_str(), static_cast<uint32_t>(address));
    else
      printf("\n%s %016" PRIx64, indent.c_str(), address);

    // Print data in hex.
    const int kBytesPerRow = 16;
    string data_as_string;
    for (int i = 0; i < kBytesPerRow; ++i, ++address) {
      uint8_t value = 0;
      if (address < stack_end &&
          memory->GetMemoryAtAddress(address, &value)) {
        printf(" %02x", value);
        data_as_string.push_back(isprint(value) ? value : '.');
      } else {
        printf("   ");
        data_as_string.push_back(' ');
      }
    }
    // Print data as string.
    printf("  %s", data_as_string.c_str());
  }

  // Try to find instruction pointers from stack.
  printf("\n%sPossible instruction pointers:\n", indent.c_str());
  for (uint64_t address = stack_begin; address < stack_end;
       address += word_length) {
    StackFrame pointee_frame;

    // Read a word (possible instruction pointer) from stack.
    if (word_length == 4) {
      uint32_t data32 = 0;
      memory->GetMemoryAtAddress(address, &data32);
      pointee_frame.instruction = data32;
    } else {
      uint64_t data64 = 0;
      memory->GetMemoryAtAddress(address, &data64);
      pointee_frame.instruction = data64;
    }
    pointee_frame.module =
        modules->GetModuleForAddress(pointee_frame.instruction);

    // Try to look up the function name.
    if (pointee_frame.module)
      resolver->FillSourceLineInfo(&pointee_frame);

    // Print function name.
    if (!pointee_frame.function_name.empty()) {
      if (word_length == 4) {
        printf("%s *(0x%08x) = 0x%08x", indent.c_str(),
               static_cast<uint32_t>(address),
               static_cast<uint32_t>(pointee_frame.instruction));
      } else {
        printf("%s *(0x%016" PRIx64 ") = 0x%016" PRIx64,
               indent.c_str(), address, pointee_frame.instruction);
      }
      printf(" <%s> [%s : %d + 0x%" PRIx64 "]\n",
             pointee_frame.function_name.c_str(),
             PathnameStripper::File(pointee_frame.source_file_name).c_str(),
             pointee_frame.source_line,
             pointee_frame.instruction - pointee_frame.source_line_base);
    }
  }
  printf("\n");
}

// PrintStack prints the call stack in |stack| to stdout, in a reasonably
// useful form.  Module, function, and source file names are displayed if
// they are available.  The code offset to the base code address of the
// source line, function, or module is printed, preferring them in that
// order.  If no source line, function, or module information is available,
// an absolute code offset is printed.
//
// If |cpu| is a recognized CPU name, relevant register state for each stack
// frame printed is also output, if available.
static void PrintStack(const CallStack* stack,
                       const string& cpu,
                       bool output_stack_contents,
                       const MemoryRegion* memory,
                       const CodeModules* modules,
                       SourceLineResolverInterface* resolver) {
  int frame_count = stack->frames()->size();
  if (frame_count == 0) {
    printf(" <no frames>\n");
  }
  for (int frame_index = 0; frame_index < frame_count; ++frame_index) {
    const StackFrame* frame = stack->frames()->at(frame_index);
    printf("%2d  ", frame_index);

    uint64_t instruction_address = frame->ReturnAddress();

    if (frame->module) {
      printf("%s", PathnameStripper::File(frame->module->code_file()).c_str());
      if (!frame->function_name.empty()) {
        printf("!%s", frame->function_name.c_str());
        if (!frame->source_file_name.empty()) {
          string source_file = PathnameStripper::File(frame->source_file_name);
          printf(" [%s : %d + 0x%" PRIx64 "]",
                 source_file.c_str(),
                 frame->source_line,
                 instruction_address - frame->source_line_base);
        } else {
          printf(" + 0x%" PRIx64, instruction_address - frame->function_base);
        }
      } else {
        printf(" + 0x%" PRIx64,
               instruction_address - frame->module->base_address());
      }
    } else {
      printf("0x%" PRIx64, instruction_address);
    }
    printf("\n ");

    int sequence = 0;
    if (cpu == "x86") {
      const StackFrameX86* frame_x86 =
        reinterpret_cast<const StackFrameX86*>(frame);

      if (frame_x86->context_validity & StackFrameX86::CONTEXT_VALID_EIP)
        sequence = PrintRegister("eip", frame_x86->context.eip, sequence);
      if (frame_x86->context_validity & StackFrameX86::CONTEXT_VALID_ESP)
        sequence = PrintRegister("esp", frame_x86->context.esp, sequence);
      if (frame_x86->context_validity & StackFrameX86::CONTEXT_VALID_EBP)
        sequence = PrintRegister("ebp", frame_x86->context.ebp, sequence);
      if (frame_x86->context_validity & StackFrameX86::CONTEXT_VALID_EBX)
        sequence = PrintRegister("ebx", frame_x86->context.ebx, sequence);
      if (frame_x86->context_validity & StackFrameX86::CONTEXT_VALID_ESI)
        sequence = PrintRegister("esi", frame_x86->context.esi, sequence);
      if (frame_x86->context_validity & StackFrameX86::CONTEXT_VALID_EDI)
        sequence = PrintRegister("edi", frame_x86->context.edi, sequence);
      if (frame_x86->context_validity == StackFrameX86::CONTEXT_VALID_ALL) {
        sequence = PrintRegister("eax", frame_x86->context.eax, sequence);
        sequence = PrintRegister("ecx", frame_x86->context.ecx, sequence);
        sequence = PrintRegister("edx", frame_x86->context.edx, sequence);
        sequence = PrintRegister("efl", frame_x86->context.eflags, sequence);
      }
    } else if (cpu == "ppc") {
      const StackFramePPC* frame_ppc =
        reinterpret_cast<const StackFramePPC*>(frame);

      if (frame_ppc->context_validity & StackFramePPC::CONTEXT_VALID_SRR0)
        sequence = PrintRegister("srr0", frame_ppc->context.srr0, sequence);
      if (frame_ppc->context_validity & StackFramePPC::CONTEXT_VALID_GPR1)
        sequence = PrintRegister("r1", frame_ppc->context.gpr[1], sequence);
    } else if (cpu == "amd64") {
      const StackFrameAMD64* frame_amd64 =
        reinterpret_cast<const StackFrameAMD64*>(frame);

      if (frame_amd64->context_validity & StackFrameAMD64::CONTEXT_VALID_RAX)
        sequence = PrintRegister64("rax", frame_amd64->context.rax, sequence);
      if (frame_amd64->context_validity & StackFrameAMD64::CONTEXT_VALID_RDX)
        sequence = PrintRegister64("rdx", frame_amd64->context.rdx, sequence);
      if (frame_amd64->context_validity & StackFrameAMD64::CONTEXT_VALID_RCX)
        sequence = PrintRegister64("rcx", frame_amd64->context.rcx, sequence);
      if (frame_amd64->context_validity & StackFrameAMD64::CONTEXT_VALID_RBX)
        sequence = PrintRegister64("rbx", frame_amd64->context.rbx, sequence);
      if (frame_amd64->context_validity & StackFrameAMD64::CONTEXT_VALID_RSI)
        sequence = PrintRegister64("rsi", frame_amd64->context.rsi, sequence);
      if (frame_amd64->context_validity & StackFrameAMD64::CONTEXT_VALID_RDI)
        sequence = PrintRegister64("rdi", frame_amd64->context.rdi, sequence);
      if (frame_amd64->context_validity & StackFrameAMD64::CONTEXT_VALID_RBP)
        sequence = PrintRegister64("rbp", frame_amd64->context.rbp, sequence);
      if (frame_amd64->context_validity & StackFrameAMD64::CONTEXT_VALID_RSP)
        sequence = PrintRegister64("rsp", frame_amd64->context.rsp, sequence);
      if (frame_amd64->context_validity & StackFrameAMD64::CONTEXT_VALID_R8)
        sequence = PrintRegister64("r8", frame_amd64->context.r8, sequence);
      if (frame_amd64->context_validity & StackFrameAMD64::CONTEXT_VALID_R9)
        sequence = PrintRegister64("r9", frame_amd64->context.r9, sequence);
      if (frame_amd64->context_validity & StackFrameAMD64::CONTEXT_VALID_R10)
        sequence = PrintRegister64("r10", frame_amd64->context.r10, sequence);
      if (frame_amd64->context_validity & StackFrameAMD64::CONTEXT_VALID_R11)
        sequence = PrintRegister64("r11", frame_amd64->context.r11, sequence);
      if (frame_amd64->context_validity & StackFrameAMD64::CONTEXT_VALID_R12)
        sequence = PrintRegister64("r12", frame_amd64->context.r12, sequence);
      if (frame_amd64->context_validity & StackFrameAMD64::CONTEXT_VALID_R13)
        sequence = PrintRegister64("r13", frame_amd64->context.r13, sequence);
      if (frame_amd64->context_validity & StackFrameAMD64::CONTEXT_VALID_R14)
        sequence = PrintRegister64("r14", frame_amd64->context.r14, sequence);
      if (frame_amd64->context_validity & StackFrameAMD64::CONTEXT_VALID_R15)
        sequence = PrintRegister64("r15", frame_amd64->context.r15, sequence);
      if (frame_amd64->context_validity & StackFrameAMD64::CONTEXT_VALID_RIP)
        sequence = PrintRegister64("rip", frame_amd64->context.rip, sequence);
    } else if (cpu == "sparc") {
      const StackFrameSPARC* frame_sparc =
        reinterpret_cast<const StackFrameSPARC*>(frame);

      if (frame_sparc->context_validity & StackFrameSPARC::CONTEXT_VALID_SP)
        sequence = PrintRegister("sp", frame_sparc->context.g_r[14], sequence);
      if (frame_sparc->context_validity & StackFrameSPARC::CONTEXT_VALID_FP)
        sequence = PrintRegister("fp", frame_sparc->context.g_r[30], sequence);
      if (frame_sparc->context_validity & StackFrameSPARC::CONTEXT_VALID_PC)
        sequence = PrintRegister("pc", frame_sparc->context.pc, sequence);
    } else if (cpu == "arm") {
      const StackFrameARM* frame_arm =
        reinterpret_cast<const StackFrameARM*>(frame);

      // Argument registers (caller-saves), which will likely only be valid
      // for the youngest frame.
      if (frame_arm->context_validity & StackFrameARM::CONTEXT_VALID_R0)
        sequence = PrintRegister("r0", frame_arm->context.iregs[0], sequence);
      if (frame_arm->context_validity & StackFrameARM::CONTEXT_VALID_R1)
        sequence = PrintRegister("r1", frame_arm->context.iregs[1], sequence);
      if (frame_arm->context_validity & StackFrameARM::CONTEXT_VALID_R2)
        sequence = PrintRegister("r2", frame_arm->context.iregs[2], sequence);
      if (frame_arm->context_validity & StackFrameARM::CONTEXT_VALID_R3)
        sequence = PrintRegister("r3", frame_arm->context.iregs[3], sequence);

      // General-purpose callee-saves registers.
      if (frame_arm->context_validity & StackFrameARM::CONTEXT_VALID_R4)
        sequence = PrintRegister("r4", frame_arm->context.iregs[4], sequence);
      if (frame_arm->context_validity & StackFrameARM::CONTEXT_VALID_R5)
        sequence = PrintRegister("r5", frame_arm->context.iregs[5], sequence);
      if (frame_arm->context_validity & StackFrameARM::CONTEXT_VALID_R6)
        sequence = PrintRegister("r6", frame_arm->context.iregs[6], sequence);
      if (frame_arm->context_validity & StackFrameARM::CONTEXT_VALID_R7)
        sequence = PrintRegister("r7", frame_arm->context.iregs[7], sequence);
      if (frame_arm->context_validity & StackFrameARM::CONTEXT_VALID_R8)
        sequence = PrintRegister("r8", frame_arm->context.iregs[8], sequence);
      if (frame_arm->context_validity & StackFrameARM::CONTEXT_VALID_R9)
        sequence = PrintRegister("r9", frame_arm->context.iregs[9], sequence);
      if (frame_arm->context_validity & StackFrameARM::CONTEXT_VALID_R10)
        sequence = PrintRegister("r10", frame_arm->context.iregs[10], sequence);
      if (frame_arm->context_validity & StackFrameARM::CONTEXT_VALID_R12)
        sequence = PrintRegister("r12", frame_arm->context.iregs[12], sequence);

      // Registers with a dedicated or conventional purpose.
      if (frame_arm->context_validity & StackFrameARM::CONTEXT_VALID_FP)
        sequence = PrintRegister("fp", frame_arm->context.iregs[11], sequence);
      if (frame_arm->context_validity & StackFrameARM::CONTEXT_VALID_SP)
        sequence = PrintRegister("sp", frame_arm->context.iregs[13], sequence);
      if (frame_arm->context_validity & StackFrameARM::CONTEXT_VALID_LR)
        sequence = PrintRegister("lr", frame_arm->context.iregs[14], sequence);
      if (frame_arm->context_validity & StackFrameARM::CONTEXT_VALID_PC)
        sequence = PrintRegister("pc", frame_arm->context.iregs[15], sequence);
    } else if (cpu == "arm64") {
      const StackFrameARM64* frame_arm64 =
        reinterpret_cast<const StackFrameARM64*>(frame);

      if (frame_arm64->context_validity & StackFrameARM64::CONTEXT_VALID_X0) {
        sequence =
            PrintRegister64("x0", frame_arm64->context.iregs[0], sequence);
      }
      if (frame_arm64->context_validity & StackFrameARM64::CONTEXT_VALID_X1) {
        sequence =
            PrintRegister64("x1", frame_arm64->context.iregs[1], sequence);
      }
      if (frame_arm64->context_validity & StackFrameARM64::CONTEXT_VALID_X2) {
        sequence =
            PrintRegister64("x2", frame_arm64->context.iregs[2], sequence);
      }
      if (frame_arm64->context_validity & StackFrameARM64::CONTEXT_VALID_X3) {
        sequence =
            PrintRegister64("x3", frame_arm64->context.iregs[3], sequence);
      }
      if (frame_arm64->context_validity & StackFrameARM64::CONTEXT_VALID_X4) {
        sequence =
            PrintRegister64("x4", frame_arm64->context.iregs[4], sequence);
      }
      if (frame_arm64->context_validity & StackFrameARM64::CONTEXT_VALID_X5) {
        sequence =
            PrintRegister64("x5", frame_arm64->context.iregs[5], sequence);
      }
      if (frame_arm64->context_validity & StackFrameARM64::CONTEXT_VALID_X6) {
        sequence =
            PrintRegister64("x6", frame_arm64->context.iregs[6], sequence);
      }
      if (frame_arm64->context_validity & StackFrameARM64::CONTEXT_VALID_X7) {
        sequence =
            PrintRegister64("x7", frame_arm64->context.iregs[7], sequence);
      }
      if (frame_arm64->context_validity & StackFrameARM64::CONTEXT_VALID_X8) {
        sequence =
            PrintRegister64("x8", frame_arm64->context.iregs[8], sequence);
      }
      if (frame_arm64->context_validity & StackFrameARM64::CONTEXT_VALID_X9) {
        sequence =
            PrintRegister64("x9", frame_arm64->context.iregs[9], sequence);
      }
      if (frame_arm64->context_validity & StackFrameARM64::CONTEXT_VALID_X10) {
        sequence =
            PrintRegister64("x10", frame_arm64->context.iregs[10], sequence);
      }
      if (frame_arm64->context_validity & StackFrameARM64::CONTEXT_VALID_X11) {
        sequence =
            PrintRegister64("x11", frame_arm64->context.iregs[11], sequence);
      }
      if (frame_arm64->context_validity & StackFrameARM64::CONTEXT_VALID_X12) {
        sequence =
            PrintRegister64("x12", frame_arm64->context.iregs[12], sequence);
      }
      if (frame_arm64->context_validity & StackFrameARM64::CONTEXT_VALID_X13) {
        sequence =
            PrintRegister64("x13", frame_arm64->context.iregs[13], sequence);
      }
      if (frame_arm64->context_validity & StackFrameARM64::CONTEXT_VALID_X14) {
        sequence =
            PrintRegister64("x14", frame_arm64->context.iregs[14], sequence);
      }
      if (frame_arm64->context_validity & StackFrameARM64::CONTEXT_VALID_X15) {
        sequence =
            PrintRegister64("x15", frame_arm64->context.iregs[15], sequence);
      }
      if (frame_arm64->context_validity & StackFrameARM64::CONTEXT_VALID_X16) {
        sequence =
            PrintRegister64("x16", frame_arm64->context.iregs[16], sequence);
      }
      if (frame_arm64->context_validity & StackFrameARM64::CONTEXT_VALID_X17) {
        sequence =
            PrintRegister64("x17", frame_arm64->context.iregs[17], sequence);
      }
      if (frame_arm64->context_validity & StackFrameARM64::CONTEXT_VALID_X18) {
        sequence =
            PrintRegister64("x18", frame_arm64->context.iregs[18], sequence);
      }
      if (frame_arm64->context_validity & StackFrameARM64::CONTEXT_VALID_X19) {
        sequence =
            PrintRegister64("x19", frame_arm64->context.iregs[19], sequence);
      }
      if (frame_arm64->context_validity & StackFrameARM64::CONTEXT_VALID_X20) {
        sequence =
            PrintRegister64("x20", frame_arm64->context.iregs[20], sequence);
      }
      if (frame_arm64->context_validity & StackFrameARM64::CONTEXT_VALID_X21) {
        sequence =
            PrintRegister64("x21", frame_arm64->context.iregs[21], sequence);
      }
      if (frame_arm64->context_validity & StackFrameARM64::CONTEXT_VALID_X22) {
        sequence =
            PrintRegister64("x22", frame_arm64->context.iregs[22], sequence);
      }
      if (frame_arm64->context_validity & StackFrameARM64::CONTEXT_VALID_X23) {
        sequence =
            PrintRegister64("x23", frame_arm64->context.iregs[23], sequence);
      }
      if (frame_arm64->context_validity & StackFrameARM64::CONTEXT_VALID_X24) {
        sequence =
            PrintRegister64("x24", frame_arm64->context.iregs[24], sequence);
      }
      if (frame_arm64->context_validity & StackFrameARM64::CONTEXT_VALID_X25) {
        sequence =
            PrintRegister64("x25", frame_arm64->context.iregs[25], sequence);
      }
      if (frame_arm64->context_validity & StackFrameARM64::CONTEXT_VALID_X26) {
        sequence =
            PrintRegister64("x26", frame_arm64->context.iregs[26], sequence);
      }
      if (frame_arm64->context_validity & StackFrameARM64::CONTEXT_VALID_X27) {
        sequence =
            PrintRegister64("x27", frame_arm64->context.iregs[27], sequence);
      }
      if (frame_arm64->context_validity & StackFrameARM64::CONTEXT_VALID_X28) {
        sequence =
            PrintRegister64("x28", frame_arm64->context.iregs[28], sequence);
      }

      // Registers with a dedicated or conventional purpose.
      if (frame_arm64->context_validity & StackFrameARM64::CONTEXT_VALID_FP) {
        sequence =
            PrintRegister64("fp", frame_arm64->context.iregs[29], sequence);
      }
      if (frame_arm64->context_validity & StackFrameARM64::CONTEXT_VALID_LR) {
        sequence =
            PrintRegister64("lr", frame_arm64->context.iregs[30], sequence);
      }
      if (frame_arm64->context_validity & StackFrameARM64::CONTEXT_VALID_SP) {
        sequence =
            PrintRegister64("sp", frame_arm64->context.iregs[31], sequence);
      }
      if (frame_arm64->context_validity & StackFrameARM64::CONTEXT_VALID_PC) {
        sequence =
            PrintRegister64("pc", frame_arm64->context.iregs[32], sequence);
      }
    } else if ((cpu == "mips") || (cpu == "mips64")) {
      const StackFrameMIPS* frame_mips =
        reinterpret_cast<const StackFrameMIPS*>(frame);

      if (frame_mips->context_validity & StackFrameMIPS::CONTEXT_VALID_GP)
        sequence = PrintRegister64("gp",
                     frame_mips->context.iregs[MD_CONTEXT_MIPS_REG_GP],
                     sequence);
      if (frame_mips->context_validity & StackFrameMIPS::CONTEXT_VALID_SP)
        sequence = PrintRegister64("sp",
                     frame_mips->context.iregs[MD_CONTEXT_MIPS_REG_SP],
                     sequence);
      if (frame_mips->context_validity & StackFrameMIPS::CONTEXT_VALID_FP)
        sequence = PrintRegister64("fp",
                     frame_mips->context.iregs[MD_CONTEXT_MIPS_REG_FP],
                     sequence);
      if (frame_mips->context_validity & StackFrameMIPS::CONTEXT_VALID_RA)
        sequence = PrintRegister64("ra",
                     frame_mips->context.iregs[MD_CONTEXT_MIPS_REG_RA],
                     sequence);
      if (frame_mips->context_validity & StackFrameMIPS::CONTEXT_VALID_PC)
        sequence = PrintRegister64("pc", frame_mips->context.epc, sequence);

      // Save registers s0-s7
      if (frame_mips->context_validity & StackFrameMIPS::CONTEXT_VALID_S0)
        sequence = PrintRegister64("s0",
                     frame_mips->context.iregs[MD_CONTEXT_MIPS_REG_S0],
                     sequence);
      if (frame_mips->context_validity & StackFrameMIPS::CONTEXT_VALID_S1)
        sequence = PrintRegister64("s1",
                     frame_mips->context.iregs[MD_CONTEXT_MIPS_REG_S1],
                     sequence);
      if (frame_mips->context_validity & StackFrameMIPS::CONTEXT_VALID_S2)
        sequence = PrintRegister64("s2",
                     frame_mips->context.iregs[MD_CONTEXT_MIPS_REG_S2],
                     sequence);
      if (frame_mips->context_validity & StackFrameMIPS::CONTEXT_VALID_S3)
        sequence = PrintRegister64("s3",
                     frame_mips->context.iregs[MD_CONTEXT_MIPS_REG_S3],
                     sequence);
      if (frame_mips->context_validity & StackFrameMIPS::CONTEXT_VALID_S4)
        sequence = PrintRegister64("s4",
                     frame_mips->context.iregs[MD_CONTEXT_MIPS_REG_S4],
                     sequence);
      if (frame_mips->context_validity & StackFrameMIPS::CONTEXT_VALID_S5)
        sequence = PrintRegister64("s5",
                     frame_mips->context.iregs[MD_CONTEXT_MIPS_REG_S5],
                     sequence);
      if (frame_mips->context_validity & StackFrameMIPS::CONTEXT_VALID_S6)
        sequence = PrintRegister64("s6",
                     frame_mips->context.iregs[MD_CONTEXT_MIPS_REG_S6],
                     sequence);
      if (frame_mips->context_validity & StackFrameMIPS::CONTEXT_VALID_S7)
        sequence = PrintRegister64("s7",
                     frame_mips->context.iregs[MD_CONTEXT_MIPS_REG_S7],
                     sequence);
    }
    printf("\n    Found by: %s\n", frame->trust_description().c_str());

    // Print stack contents.
    if (output_stack_contents && frame_index + 1 < frame_count) {
      const string indent("    ");
      PrintStackContents(indent, frame, stack->frames()->at(frame_index + 1),
                         cpu, memory, modules, resolver);
    }
  }
}

// PrintStackMachineReadable prints the call stack in |stack| to stdout,
// in the following machine readable pipe-delimited text format:
// thread number|frame number|module|function|source file|line|offset
//
// Module, function, source file, and source line may all be empty
// depending on availability.  The code offset follows the same rules as
// PrintStack above.
static void PrintStackMachineReadable(int thread_num, const CallStack* stack) {
  int frame_count = stack->frames()->size();
  for (int frame_index = 0; frame_index < frame_count; ++frame_index) {
    const StackFrame* frame = stack->frames()->at(frame_index);
    printf("%d%c%d%c", thread_num, kOutputSeparator, frame_index,
           kOutputSeparator);

    uint64_t instruction_address = frame->ReturnAddress();

    if (frame->module) {
      assert(!frame->module->code_file().empty());
      printf("%s", StripSeparator(PathnameStripper::File(
                     frame->module->code_file())).c_str());
      if (!frame->function_name.empty()) {
        printf("%c%s", kOutputSeparator,
               StripSeparator(frame->function_name).c_str());
        if (!frame->source_file_name.empty()) {
          printf("%c%s%c%d%c0x%" PRIx64,
                 kOutputSeparator,
                 StripSeparator(frame->source_file_name).c_str(),
                 kOutputSeparator,
                 frame->source_line,
                 kOutputSeparator,
                 instruction_address - frame->source_line_base);
        } else {
          printf("%c%c%c0x%" PRIx64,
                 kOutputSeparator,  // empty source file
                 kOutputSeparator,  // empty source line
                 kOutputSeparator,
                 instruction_address - frame->function_base);
        }
      } else {
        printf("%c%c%c%c0x%" PRIx64,
               kOutputSeparator,  // empty function name
               kOutputSeparator,  // empty source file
               kOutputSeparator,  // empty source line
               kOutputSeparator,
               instruction_address - frame->module->base_address());
      }
    } else {
      // the printf before this prints a trailing separator for module name
      printf("%c%c%c%c0x%" PRIx64,
             kOutputSeparator,  // empty function name
             kOutputSeparator,  // empty source file
             kOutputSeparator,  // empty source line
             kOutputSeparator,
             instruction_address);
    }
    printf("\n");
  }
}

// ContainsModule checks whether a given |module| is in the vector
// |modules_without_symbols|.
static bool ContainsModule(
    const vector<const CodeModule*>* modules,
    const CodeModule* module) {
  assert(modules);
  assert(module);
  vector<const CodeModule*>::const_iterator iter;
  for (iter = modules->begin(); iter != modules->end(); ++iter) {
    if (module->debug_file().compare((*iter)->debug_file()) == 0 &&
        module->debug_identifier().compare((*iter)->debug_identifier()) == 0) {
      return true;
    }
  }
  return false;
}

// PrintModule prints a single |module| to stdout.
// |modules_without_symbols| should contain the list of modules that were
// confirmed to be missing their symbols during the stack walk.
static void PrintModule(
    const CodeModule* module,
    const vector<const CodeModule*>* modules_without_symbols,
    const vector<const CodeModule*>* modules_with_corrupt_symbols,
    uint64_t main_address) {
  string symbol_issues;
  if (ContainsModule(modules_without_symbols, module)) {
    symbol_issues = "  (WARNING: No symbols, " +
        PathnameStripper::File(module->debug_file()) + ", " +
        module->debug_identifier() + ")";
  } else if (ContainsModule(modules_with_corrupt_symbols, module)) {
    symbol_issues = "  (WARNING: Corrupt symbols, " +
        PathnameStripper::File(module->debug_file()) + ", " +
        module->debug_identifier() + ")";
  }
  uint64_t base_address = module->base_address();
  printf("0x%08" PRIx64 " - 0x%08" PRIx64 "  %s  %s%s%s\n",
         base_address, base_address + module->size() - 1,
         PathnameStripper::File(module->code_file()).c_str(),
         module->version().empty() ? "???" : module->version().c_str(),
         main_address != 0 && base_address == main_address ? "  (main)" : "",
         symbol_issues.c_str());
}

// PrintModules prints the list of all loaded |modules| to stdout.
// |modules_without_symbols| should contain the list of modules that were
// confirmed to be missing their symbols during the stack walk.
static void PrintModules(
    const CodeModules* modules,
    const vector<const CodeModule*>* modules_without_symbols,
    const vector<const CodeModule*>* modules_with_corrupt_symbols) {
  if (!modules)
    return;

  printf("\n");
  printf("Loaded modules:\n");

  uint64_t main_address = 0;
  const CodeModule* main_module = modules->GetMainModule();
  if (main_module) {
    main_address = main_module->base_address();
  }

  unsigned int module_count = modules->module_count();
  for (unsigned int module_sequence = 0;
       module_sequence < module_count;
       ++module_sequence) {
    const CodeModule* module = modules->GetModuleAtSequence(module_sequence);
    PrintModule(module, modules_without_symbols, modules_with_corrupt_symbols,
                main_address);
  }
}

// PrintModulesMachineReadable outputs a list of loaded modules,
// one per line, in the following machine-readable pipe-delimited
// text format:
// Module|{Module Filename}|{Version}|{Debug Filename}|{Debug Identifier}|
// {Base Address}|{Max Address}|{Main}
static void PrintModulesMachineReadable(const CodeModules* modules) {
  if (!modules)
    return;

  uint64_t main_address = 0;
  const CodeModule* main_module = modules->GetMainModule();
  if (main_module) {
    main_address = main_module->base_address();
  }

  unsigned int module_count = modules->module_count();
  for (unsigned int module_sequence = 0;
       module_sequence < module_count;
       ++module_sequence) {
    const CodeModule* module = modules->GetModuleAtSequence(module_sequence);
    uint64_t base_address = module->base_address();
    printf("Module%c%s%c%s%c%s%c%s%c0x%08" PRIx64 "%c0x%08" PRIx64 "%c%d\n",
           kOutputSeparator,
           StripSeparator(PathnameStripper::File(module->code_file())).c_str(),
           kOutputSeparator, StripSeparator(module->version()).c_str(),
           kOutputSeparator,
           StripSeparator(PathnameStripper::File(module->debug_file())).c_str(),
           kOutputSeparator,
           StripSeparator(module->debug_identifier()).c_str(),
           kOutputSeparator, base_address,
           kOutputSeparator, base_address + module->size() - 1,
           kOutputSeparator,
           main_module != NULL && base_address == main_address ? 1 : 0);
  }
}

}  // namespace

void PrintProcessState(const ProcessState& process_state,
                       bool output_stack_contents,
                       SourceLineResolverInterface* resolver) {
  // Print OS and CPU information.
  string cpu = process_state.system_info()->cpu;
  string cpu_info = process_state.system_info()->cpu_info;
  printf("Operating system: %s\n", process_state.system_info()->os.c_str());
  printf("                  %s\n",
         process_state.system_info()->os_version.c_str());
  printf("CPU: %s\n", cpu.c_str());
  if (!cpu_info.empty()) {
    // This field is optional.
    printf("     %s\n", cpu_info.c_str());
  }
  printf("     %d CPU%s\n",
         process_state.system_info()->cpu_count,
         process_state.system_info()->cpu_count != 1 ? "s" : "");
  printf("\n");

  // Print GPU information
  string gl_version = process_state.system_info()->gl_version;
  string gl_vendor = process_state.system_info()->gl_vendor;
  string gl_renderer = process_state.system_info()->gl_renderer;
  printf("GPU:");
  if (!gl_version.empty() || !gl_vendor.empty() || !gl_renderer.empty()) {
    printf(" %s\n", gl_version.c_str());
    printf("     %s\n", gl_vendor.c_str());
    printf("     %s\n", gl_renderer.c_str());
  } else {
    printf(" UNKNOWN\n");
  }
  printf("\n");

  // Print crash information.
  if (process_state.crashed()) {
    printf("Crash reason:  %s\n", process_state.crash_reason().c_str());
    printf("Crash address: 0x%" PRIx64 "\n", process_state.crash_address());
  } else {
    printf("No crash\n");
  }

  string assertion = process_state.assertion();
  if (!assertion.empty()) {
    printf("Assertion: %s\n", assertion.c_str());
  }

  // Compute process uptime if the process creation and crash times are
  // available in the dump.
  if (process_state.time_date_stamp() != 0 &&
      process_state.process_create_time() != 0 &&
      process_state.time_date_stamp() >= process_state.process_create_time()) {
    printf("Process uptime: %d seconds\n",
           process_state.time_date_stamp() -
               process_state.process_create_time());
  } else {
    printf("Process uptime: not available\n");
  }

  // If the thread that requested the dump is known, print it first.
  int requesting_thread = process_state.requesting_thread();
  if (requesting_thread != -1) {
    printf("\n");
    printf("Thread %d (%s)\n",
          requesting_thread,
          process_state.crashed() ? "crashed" :
                                    "requested dump, did not crash");
    PrintStack(process_state.threads()->at(requesting_thread), cpu,
               output_stack_contents,
               process_state.thread_memory_regions()->at(requesting_thread),
               process_state.modules(), resolver);
  }

  // Print all of the threads in the dump.
  int thread_count = process_state.threads()->size();
  for (int thread_index = 0; thread_index < thread_count; ++thread_index) {
    if (thread_index != requesting_thread) {
      // Don't print the crash thread again, it was already printed.
      printf("\n");
      printf("Thread %d\n", thread_index);
      PrintStack(process_state.threads()->at(thread_index), cpu,
                 output_stack_contents,
                 process_state.thread_memory_regions()->at(thread_index),
                 process_state.modules(), resolver);
    }
  }

  PrintModules(process_state.modules(),
               process_state.modules_without_symbols(),
               process_state.modules_with_corrupt_symbols());
}

void PrintProcessStateMachineReadable(const ProcessState& process_state) {
  // Print OS and CPU information.
  // OS|{OS Name}|{OS Version}
  // CPU|{CPU Name}|{CPU Info}|{Number of CPUs}
  // GPU|{GPU version}|{GPU vendor}|{GPU renderer}
  printf("OS%c%s%c%s\n", kOutputSeparator,
         StripSeparator(process_state.system_info()->os).c_str(),
         kOutputSeparator,
         StripSeparator(process_state.system_info()->os_version).c_str());
  printf("CPU%c%s%c%s%c%d\n", kOutputSeparator,
         StripSeparator(process_state.system_info()->cpu).c_str(),
         kOutputSeparator,
         // this may be empty
         StripSeparator(process_state.system_info()->cpu_info).c_str(),
         kOutputSeparator,
         process_state.system_info()->cpu_count);
  printf("GPU%c%s%c%s%c%s\n", kOutputSeparator,
         StripSeparator(process_state.system_info()->gl_version).c_str(),
         kOutputSeparator,
         StripSeparator(process_state.system_info()->gl_vendor).c_str(),
         kOutputSeparator,
         StripSeparator(process_state.system_info()->gl_renderer).c_str());

  int requesting_thread = process_state.requesting_thread();

  // Print crash information.
  // Crash|{Crash Reason}|{Crash Address}|{Crashed Thread}
  printf("Crash%c", kOutputSeparator);
  if (process_state.crashed()) {
    printf("%s%c0x%" PRIx64 "%c",
           StripSeparator(process_state.crash_reason()).c_str(),
           kOutputSeparator, process_state.crash_address(), kOutputSeparator);
  } else {
    // print assertion info, if available, in place of crash reason,
    // instead of the unhelpful "No crash"
    string assertion = process_state.assertion();
    if (!assertion.empty()) {
      printf("%s%c%c", StripSeparator(assertion).c_str(),
             kOutputSeparator, kOutputSeparator);
    } else {
      printf("No crash%c%c", kOutputSeparator, kOutputSeparator);
    }
  }

  if (requesting_thread != -1) {
    printf("%d\n", requesting_thread);
  } else {
    printf("\n");
  }

  PrintModulesMachineReadable(process_state.modules());

  // blank line to indicate start of threads
  printf("\n");

  // If the thread that requested the dump is known, print it first.
  if (requesting_thread != -1) {
    PrintStackMachineReadable(requesting_thread,
                              process_state.threads()->at(requesting_thread));
  }

  // Print all of the threads in the dump.
  int thread_count = process_state.threads()->size();
  for (int thread_index = 0; thread_index < thread_count; ++thread_index) {
    if (thread_index != requesting_thread) {
      // Don't print the crash thread again, it was already printed.
      PrintStackMachineReadable(thread_index,
                                process_state.threads()->at(thread_index));
    }
  }
}

}  // namespace google_breakpad