compiler/driver/compiler_options.cc

/*
 * Copyright (C) 2015 The Android Open Source Project
 *
 * Licensed under the Apache License, Version 2.0 (the "License");
 * you may not use this file except in compliance with the License.
 * You may obtain a copy of the License at
 *
 *      http://www.apache.org/licenses/LICENSE-2.0
 *
 * Unless required by applicable law or agreed to in writing, software
 * distributed under the License is distributed on an "AS IS" BASIS,
 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 * See the License for the specific language governing permissions and
 * limitations under the License.
 */

#include "compiler_options.h"

#include <fstream>

#include "android-base/stringprintf.h"

#include "base/variant_map.h"
#include "cmdline_parser.h"
#include "compiler_options_map-inl.h"
#include "runtime.h"
#include "simple_compiler_options_map.h"

namespace art {

CompilerOptions::CompilerOptions()
    : compiler_filter_(CompilerFilter::kDefaultCompilerFilter),
      huge_method_threshold_(kDefaultHugeMethodThreshold),
      large_method_threshold_(kDefaultLargeMethodThreshold),
      small_method_threshold_(kDefaultSmallMethodThreshold),
      tiny_method_threshold_(kDefaultTinyMethodThreshold),
      num_dex_methods_threshold_(kDefaultNumDexMethodsThreshold),
      inline_max_code_units_(kUnsetInlineMaxCodeUnits),
      no_inline_from_(nullptr),
      boot_image_(false),
      core_image_(false),
      app_image_(false),
      top_k_profile_threshold_(kDefaultTopKProfileThreshold),
      debuggable_(false),
      generate_debug_info_(kDefaultGenerateDebugInfo),
      generate_mini_debug_info_(kDefaultGenerateMiniDebugInfo),
      generate_build_id_(false),
      implicit_null_checks_(true),
      implicit_so_checks_(true),
      implicit_suspend_checks_(false),
      compile_pic_(false),
      verbose_methods_(),
      abort_on_hard_verifier_failure_(false),
      init_failure_output_(nullptr),
      dump_cfg_file_name_(""),
      dump_cfg_append_(false),
      force_determinism_(false),
      register_allocation_strategy_(RegisterAllocator::kRegisterAllocatorDefault),
      passes_to_run_(nullptr) {
}

CompilerOptions::~CompilerOptions() {
  // The destructor looks empty but it destroys a PassManagerOptions object. We keep it here
  // because we don't want to include the PassManagerOptions definition from the header file.
}

bool CompilerOptions::EmitRunTimeChecksInDebugMode() const {
  // Run-time checks (e.g. Marking Register checks) are only emitted
  // in debug mode, and
  // - when running on device; or
  // - when running on host, but only
  //   - when compiling the core image (which is used only for testing); or
  //   - when JIT compiling (only relevant for non-native methods).
  // This is to prevent these checks from being emitted into pre-opted
  // boot image or apps, as these are compiled with dex2oatd.
  return kIsDebugBuild &&
      (kIsTargetBuild || IsCoreImage() || Runtime::Current()->UseJitCompilation());
}

bool CompilerOptions::ParseDumpInitFailures(const std::string& option, std::string* error_msg) {
  init_failure_output_.reset(new std::ofstream(option));
  if (init_failure_output_.get() == nullptr) {
    *error_msg = "Failed to construct std::ofstream";
    return false;
  } else if (init_failure_output_->fail()) {
    *error_msg = android::base::StringPrintf(
        "Failed to open %s for writing the initialization failures.", option.c_str());
    init_failure_output_.reset();
    return false;
  }
  return true;
}

bool CompilerOptions::ParseRegisterAllocationStrategy(const std::string& option,
                                                      std::string* error_msg) {
  if (option == "linear-scan") {
    register_allocation_strategy_ = RegisterAllocator::Strategy::kRegisterAllocatorLinearScan;
  } else if (option == "graph-color") {
    register_allocation_strategy_ = RegisterAllocator::Strategy::kRegisterAllocatorGraphColor;
  } else {
    *error_msg = "Unrecognized register allocation strategy. Try linear-scan, or graph-color.";
    return false;
  }
  return true;
}

#pragma GCC diagnostic push
#pragma GCC diagnostic ignored "-Wframe-larger-than="

bool CompilerOptions::ParseCompilerOptions(const std::vector<std::string>& options,
                                           bool ignore_unrecognized,
                                           std::string* error_msg) {
  auto parser = CreateSimpleParser(ignore_unrecognized);
  CmdlineResult parse_result = parser.Parse(options);
  if (!parse_result.IsSuccess()) {
    *error_msg = parse_result.GetMessage();
    return false;
  }

  SimpleParseArgumentMap args = parser.ReleaseArgumentsMap();
  return ReadCompilerOptions(args, this, error_msg);
}

#pragma GCC diagnostic pop

}  // namespace art