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// stackwalker_arm.cc: arm-specific stackwalker.
//
// See stackwalker_arm.h for documentation.
//
// Author: Mark Mentovai, Ted Mielczarek


#include "processor/stackwalker_arm.h"
#include "google_breakpad/processor/call_stack.h"
#include "google_breakpad/processor/memory_region.h"
#include "google_breakpad/processor/stack_frame_cpu.h"
#include "processor/logging.h"

namespace google_breakpad {


StackwalkerARM::StackwalkerARM(const SystemInfo *system_info,
                               const MDRawContextARM *context,
                               MemoryRegion *memory,
                               const CodeModules *modules,
                               SymbolSupplier *supplier,
                               SourceLineResolverInterface *resolver)
    : Stackwalker(system_info, memory, modules, supplier, resolver),
      context_(context) {
}


StackFrame* StackwalkerARM::GetContextFrame() {
  if (!context_ || !memory_) {
    BPLOG(ERROR) << "Can't get context frame without context or memory";
    return NULL;
  }

  StackFrameARM *frame = new StackFrameARM();

  // The instruction pointer is stored directly in a register (r15), so pull it
  // straight out of the CPU context structure.
  frame->context = *context_;
  frame->context_validity = StackFrameARM::CONTEXT_VALID_ALL;
  frame->instruction = frame->context.iregs[15];

  return frame;
}


StackFrame* StackwalkerARM::GetCallerFrame(const CallStack *stack) {
  if (!memory_ || !stack) {
    BPLOG(ERROR) << "Can't get caller frame without memory or stack";
    return NULL;
  }

  // TODO: Can't actually walk the stack on ARM without the CFI data.
  // Implement this when the CFI symbol dumper changes have landed.
  return NULL;
}


}  // namespace google_breakpad