CoreMedia.cpp

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//===-- CoreMedia.cpp -----------------------------------------------------===//
//
// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
// See https://llvm.org/LICENSE.txt for license information.
// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
//
//===----------------------------------------------------------------------===//

#include "CoreMedia.h"

#include "lldb/Utility/Flags.h"
#include "lldb/Utility/Log.h"

#include "lldb/Symbol/TypeSystem.h"
#include "lldb/Target/Target.h"
#include <inttypes.h>

using namespace lldb;
using namespace lldb_private;
using namespace lldb_private::formatters;

bool lldb_private::formatters::CMTimeSummaryProvider(
    ValueObject &valobj, Stream &stream, const TypeSummaryOptions &options) {
  CompilerType type = valobj.GetCompilerType();
  if (!type.IsValid())
    return false;

  auto type_system_or_err =
      valobj.GetExecutionContextRef()
          .GetTargetSP()
          ->GetScratchTypeSystemForLanguage(lldb::eLanguageTypeC);
  if (auto err = type_system_or_err.takeError()) {
    LLDB_LOG_ERROR(
        lldb_private::GetLogIfAnyCategoriesSet(LIBLLDB_LOG_DATAFORMATTERS),
        std::move(err), "Failed to get scratch type system");
    return false;
  }
  // fetch children by offset to compensate for potential lack of debug info
  auto int64_ty = type_system_or_err->GetBuiltinTypeForEncodingAndBitSize(
      eEncodingSint, 64);
  auto int32_ty = type_system_or_err->GetBuiltinTypeForEncodingAndBitSize(
      eEncodingSint, 32);

  auto value_sp(valobj.GetSyntheticChildAtOffset(0, int64_ty, true));
  auto timescale_sp(valobj.GetSyntheticChildAtOffset(8, int32_ty, true));
  auto flags_sp(valobj.GetSyntheticChildAtOffset(12, int32_ty, true));

  if (!value_sp || !timescale_sp || !flags_sp)
    return false;

  auto value = value_sp->GetValueAsUnsigned(0);
  auto timescale = (int32_t)timescale_sp->GetValueAsUnsigned(
      0); // the timescale specifies the fraction of a second each unit in the
          // numerator occupies
  auto flags = Flags(flags_sp->GetValueAsUnsigned(0) &
                     0x00000000000000FF); // the flags I need sit in the LSB

  const unsigned int FlagPositiveInf = 4;
  const unsigned int FlagNegativeInf = 8;
  const unsigned int FlagIndefinite = 16;

  if (flags.AnySet(FlagIndefinite)) {
    stream.Printf("indefinite");
    return true;
  }

  if (flags.AnySet(FlagPositiveInf)) {
    stream.Printf("+oo");
    return true;
  }

  if (flags.AnySet(FlagNegativeInf)) {
    stream.Printf("-oo");
    return true;
  }

  if (timescale == 0)
    return false;

  switch (timescale) {
  case 0:
    return false;
  case 1:
    stream.Printf("%" PRId64 " seconds", value);
    return true;
  case 2:
    stream.Printf("%" PRId64 " half seconds", value);
    return true;
  case 3:
    stream.Printf("%" PRId64 " third%sof a second", value,
                  value == 1 ? " " : "s ");
    return true;
  default:
    stream.Printf("%" PRId64 " %" PRId32 "th%sof a second", value, timescale,
                  value == 1 ? " " : "s ");
    return true;
  }
}