cmake_minimum_required (VERSION 3.0)
cmake_policy(SET CMP0048 NEW)
project (Bloaty VERSION 1.0)

# Options we define for users.
option(BLOATY_ENABLE_ASAN "Enable address sanitizer." OFF)
option(BLOATY_ENABLE_UBSAN "Enable undefined behavior sanitizer." OFF)

# Set default build type.
if(NOT CMAKE_BUILD_TYPE)
  message(STATUS "Setting build type to 'RelWithDebInfo' as none was specified.")
  set(CMAKE_BUILD_TYPE "RelWithDebInfo" CACHE STRING
      "Choose the type of build, options are: Debug Release RelWithDebInfo MinSizeRel."
      FORCE)
endif()

# Check out Git submodules.
if (EXISTS "${CMAKE_CURRENT_SOURCE_DIR}/.gitmodules")
  execute_process (COMMAND git submodule update --init --recursive
                   WORKING_DIRECTORY ${CMAKE_CURRENT_SOURCE_DIR})
endif()

# Add third_party libraries, disabling as much as we can of their builds.
set(RE2_BUILD_TESTING OFF CACHE BOOL "enable testing for RE2" FORCE)
set(CAPSTONE_BUILD_SHARED OFF CACHE BOOL "Build shared library" FORCE)
set(CAPSTONE_BUILD_TESTS OFF CACHE BOOL "Build tests" FORCE)
set(protobuf_BUILD_TESTS OFF CACHE BOOL "enable tests for proto2" FORCE)
set(protobuf_BUILD_SHARED_LIBS OFF CACHE BOOL "enable shared libs for proto2" FORCE)
add_definitions(-D_LIBCXXABI_FUNC_VIS=)  # For Demumble.
add_subdirectory(third_party/re2)
add_subdirectory(third_party/capstone)
add_subdirectory(third_party/protobuf/cmake)

include_directories(third_party/capstone/include)
include_directories(third_party/re2)
include_directories(third_party/protobuf/src)
include_directories(.)
include_directories(src)
include_directories(third_party/abseil-cpp)
include_directories("${CMAKE_CURRENT_BINARY_DIR}/src")

# Baseline build flags.
set(CMAKE_CXX_FLAGS "-std=c++11 -W -Wall -Wno-sign-compare")
set(CMAKE_CXX_FLAGS_DEBUG "-g1")
set(CMAKE_CXX_FLAGS_RELEASE "-O2")
set(CMAKE_CXX_FLAGS_RELWITHDEBINFO "-O2 -g1")

if(APPLE)
elseif(UNIX)
  set(CMAKE_EXE_LINKER_FLAGS "-Wl,--build-id")
endif()

# When using Ninja, compiler output won't be colorized without this.
include(CheckCXXCompilerFlag)
CHECK_CXX_COMPILER_FLAG(-fdiagnostics-color=always SUPPORTS_COLOR_ALWAYS)
if(SUPPORTS_COLOR_ALWAYS)
  set(CMAKE_CXX_FLAGS "${CMAKE_CXX_FLAGS} -fdiagnostics-color=always")
endif()

# Implement ASAN/UBSAN options
if(BLOATY_ENABLE_ASAN)
  set(CMAKE_CXX_FLAGS "${CMAKE_CXX_FLAGS} -fsanitize=address")
  set(CMAKE_LINKER_FLAGS_DEBUG "${CMAKE_LINKER_FLAGS_DEBUG} -fsanitize=address")
endif()

if(BLOATY_ENABLE_UBSAN)
  set(CMAKE_CXX_FLAGS "${CMAKE_CXX_FLAGS} -fsanitize=undefined")
  set(CMAKE_LINKER_FLAGS_DEBUG "${CMAKE_LINKER_FLAGS_DEBUG} -fsanitize=undefined")
endif()

if(DEFINED ENV{CXXFLAGS})
  set(CMAKE_CXX_FLAGS "${CMAKE_CXX_FLAGS} $ENV{CXXFLAGS}")
endif()

file(MAKE_DIRECTORY ${CMAKE_CURRENT_BINARY_DIR}/src)
add_custom_command(
  OUTPUT ${CMAKE_CURRENT_BINARY_DIR}/src/bloaty.pb.cc
  DEPENDS protoc ${CMAKE_CURRENT_SOURCE_DIR}/src/bloaty.proto
  COMMAND protoc ${CMAKE_CURRENT_SOURCE_DIR}/src/bloaty.proto
      --cpp_out=${CMAKE_CURRENT_BINARY_DIR}/src
      -I${CMAKE_CURRENT_SOURCE_DIR}/src
)

add_library(libbloaty
    src/bloaty.cc
    src/demangle.cc
    src/disassemble.cc
    ${CMAKE_CURRENT_BINARY_DIR}/src/bloaty.pb.cc
    src/dwarf.cc
    src/elf.cc
    src/macho.cc
    src/range_map.cc
    src/webassembly.cc
    # Until Abseil has a proper CMake build system
    third_party/abseil-cpp/absl/base/internal/raw_logging.cc # Grrrr...
    third_party/abseil-cpp/absl/base/internal/throw_delegate.cc
    third_party/abseil-cpp/absl/strings/ascii.cc
    third_party/abseil-cpp/absl/strings/charconv.cc
    third_party/abseil-cpp/absl/strings/internal/charconv_bigint.cc
    third_party/abseil-cpp/absl/strings/internal/charconv_parse.cc
    third_party/abseil-cpp/absl/strings/escaping.cc
    third_party/abseil-cpp/absl/strings/internal/memutil.cc
    third_party/abseil-cpp/absl/strings/internal/utf8.cc
    third_party/abseil-cpp/absl/strings/numbers.cc
    third_party/abseil-cpp/absl/strings/str_cat.cc
    third_party/abseil-cpp/absl/strings/string_view.cc
    third_party/abseil-cpp/absl/strings/str_split.cc
    third_party/abseil-cpp/absl/strings/substitute.cc
    third_party/abseil-cpp/absl/types/bad_optional_access.cc
    third_party/abseil-cpp/absl/types/optional.cc
    # One source file, no special build system needed.
    third_party/demumble/third_party/libcxxabi/cxa_demangle.cpp
    )


set(LIBBLOATY_LIBS libbloaty libprotoc re2 capstone-static)


if(DEFINED ENV{LIB_FUZZING_ENGINE})
  message("LIB_FUZZING_ENGINE set, building fuzz_target instead of Bloaty")
  add_executable(fuzz_target tests/fuzz_target.cc)
  target_link_libraries(fuzz_target "${LIBBLOATY_LIBS}" "${CMAKE_THREAD_LIBS_INIT}" $ENV{LIB_FUZZING_ENGINE})
else()
  add_executable(bloaty src/main.cc)
  target_link_libraries(bloaty "${LIBBLOATY_LIBS}")

  # All of this is to add -pthread, which is required by re2 (not us).
  find_package(Threads REQUIRED)
  if(THREADS_HAVE_PTHREAD_ARG)
    set_property(TARGET bloaty PROPERTY COMPILE_OPTIONS "-pthread")
    set_property(TARGET bloaty PROPERTY INTERFACE_COMPILE_OPTIONS "-pthread")
  endif()
  if(CMAKE_THREAD_LIBS_INIT)
    target_link_libraries(bloaty "${CMAKE_THREAD_LIBS_INIT}")
  endif()

  install(
    TARGETS bloaty
    EXPORT ${PROJECT_NAME}Targets
    RUNTIME DESTINATION bin
  )

  if (IS_DIRECTORY "${PROJECT_SOURCE_DIR}/tests")
    enable_testing()

    if(BUILD_TESTING)
      add_subdirectory(third_party/googletest)
      include_directories(third_party/googletest/googletest/include)
      include_directories(third_party/googletest/googlemock/include)

      set(TEST_TARGETS
          bloaty_test
          bloaty_misc_test
          range_map_test
          )

      foreach(target ${TEST_TARGETS})
        add_executable(${target} tests/${target}.cc)
        target_link_libraries(${target} "${LIBBLOATY_LIBS}" gtest_main gmock "${CMAKE_THREAD_LIBS_INIT}")
      endforeach(target)

      add_executable(fuzz_test tests/fuzz_target.cc tests/fuzz_driver.cc)
      target_link_libraries(fuzz_test "${LIBBLOATY_LIBS}" "${CMAKE_THREAD_LIBS_INIT}")

      file(GLOB fuzz_corpus tests/testdata/fuzz_corpus/*)

      add_test(NAME range_map_test COMMAND range_map_test)
      add_test(NAME bloaty_test_x86-64 COMMAND bloaty_test WORKING_DIRECTORY ${CMAKE_CURRENT_SOURCE_DIR}/tests/testdata/linux-x86_64)
      add_test(NAME bloaty_test_x86 COMMAND bloaty_test WORKING_DIRECTORY ${CMAKE_CURRENT_SOURCE_DIR}/tests/testdata/linux-x86)
      add_test(NAME bloaty_misc_test COMMAND bloaty_misc_test WORKING_DIRECTORY ${CMAKE_CURRENT_SOURCE_DIR}/tests/testdata/misc)
      add_test(NAME fuzz_test COMMAND fuzz_test ${fuzz_corpus} WORKING_DIRECTORY ${CMAKE_CURRENT_SOURCE_DIR}/tests/testdata/fuzz_corpus)
    endif()
  endif()

  install(EXPORT ${PROJECT_NAME}Targets NAMESPACE ${PROJECT_NAME} DESTINATION lib/${PROJECT_NAME})
endif()