dump_context.h

// Copyright (c) 2014 Google Inc.
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// dump_context.h: A (mini/micro) dump CPU-specific context.

#ifndef GOOGLE_BREAKPAD_PROCESSOR_DUMP_CONTEXT_H__
#define GOOGLE_BREAKPAD_PROCESSOR_DUMP_CONTEXT_H__

#include "google_breakpad/common/minidump_format.h"
#include "google_breakpad/processor/dump_object.h"

namespace google_breakpad {

// DumpContext carries a CPU-specific MDRawContext structure, which contains CPU
// context such as register states.
class DumpContext : public DumpObject {
 public:
  virtual ~DumpContext();

  // Returns an MD_CONTEXT_* value such as MD_CONTEXT_X86 or MD_CONTEXT_PPC
  // identifying the CPU type that the context was collected from.  The
  // returned value will identify the CPU only, and will have any other
  // MD_CONTEXT_* bits masked out.  Returns 0 on failure.
  uint32_t GetContextCPU() const;

  // Return the raw value of |context_flags_|
  uint32_t GetContextFlags() const;

  // Returns raw CPU-specific context data for the named CPU type.  If the
  // context data does not match the CPU type or does not exist, returns NULL.
  const MDRawContextAMD64* GetContextAMD64() const;
  const MDRawContextARM*   GetContextARM() const;
  const MDRawContextARM64* GetContextARM64() const;
  const MDRawContextMIPS*  GetContextMIPS() const;
  const MDRawContextPPC*   GetContextPPC() const;
  const MDRawContextPPC64* GetContextPPC64() const;
  const MDRawContextSPARC* GetContextSPARC() const;
  const MDRawContextX86*   GetContextX86() const;

  // A convenience method to get the instruction pointer out of the
  // MDRawContext, since it varies per-CPU architecture.
  bool GetInstructionPointer(uint64_t* ip) const;

  // Similar to the GetInstructionPointer method, this method gets the stack
  // pointer for all CPU architectures.
  bool GetStackPointer(uint64_t* sp) const;

  // Print a human-readable representation of the object to stdout.
  void Print();

 protected:
  DumpContext();

  // Sets row CPU-specific context data for the names CPU type.
  void SetContextFlags(uint32_t context_flags);
  void SetContextX86(MDRawContextX86* x86);
  void SetContextPPC(MDRawContextPPC* ppc);
  void SetContextPPC64(MDRawContextPPC64* ppc64);
  void SetContextAMD64(MDRawContextAMD64* amd64);
  void SetContextSPARC(MDRawContextSPARC* ctx_sparc);
  void SetContextARM(MDRawContextARM* arm);
  void SetContextARM64(MDRawContextARM64* arm64);
  void SetContextMIPS(MDRawContextMIPS* ctx_mips);

  // Free the CPU-specific context structure.
  void FreeContext();

 private:
  // The CPU-specific context structure.
  union {
    MDRawContextBase*  base;
    MDRawContextX86*   x86;
    MDRawContextPPC*   ppc;
    MDRawContextPPC64* ppc64;
    MDRawContextAMD64* amd64;
    // on Solaris SPARC, sparc is defined as a numeric constant,
    // so variables can NOT be named as sparc
    MDRawContextSPARC* ctx_sparc;
    MDRawContextARM*   arm;
    MDRawContextARM64* arm64;
    MDRawContextMIPS*  ctx_mips;
  } context_;

  // Store this separately because of the weirdo AMD64 context
  uint32_t context_flags_;
};

}  // namespace google_breakpad

#endif  // GOOGLE_BREAKPAD_PROCESSOR_DUMP_CONTEXT_H__