#
# cmake warning options
#

if(DYNINST_DISABLE_DIAGNOSTIC_SUPPRESSIONS)
  message(
    STATUS
      "DYNINST_DISABLE_DIAGNOSTIC_SUPPRESSIONS set: disabling all dyninst warning suppressions and frame size overrides"
    )
endif()

# Frame sizes are larger for debug build, so adjust based on build type files with
# functions containing large frames are adjust below (the value could be made
# significantly maller if more files are adjusted).
#
set(defaultDebugMaxFrameSize 24576)
set(defaultNonDebugMaxFrameSize 20480)

# REQUESTED_WARNING_FLAGS is a list of warning flags for C and C++ programs to enable if
# supported by the compiler.  The values do not include the the initial '-'

list(
  APPEND
  REQUESTED_WARNING_FLAGS
  Wall
  Wextra
  Wpedantic
  Walloca
  Wcast-align
  Wcast-qual
  Wcomma-subscript
  Wctor-dtor-privacy
  Wdeprecated-copy-dtor
  Wdouble-promotion
  Wduplicated-branches
  Wduplicated-cond
  Wenum-conversion
  Wextra-semi
  Wfloat-equal
  Wformat-overflow=2
  Wformat-signedness
  Wformat=2
  Wframe-larger-than=${defaultNonDebugMaxFrameSize}
  Wjump-misses-init
  Wlogical-op
  Wmismatched-tags
  Wmissing-braces
  Wmultichar
  Wnoexcept
  Wnon-virtual-dtor
  Woverloaded-virtual
  Wpointer-arith
  Wrange-loop-construct
  Wrestrict
  Wshadow
  Wstrict-null-sentinel
  Wsuggest-attribute=format
  Wsuggest-attribute=malloc
  Wuninitialized
  Wvla
  Wvolatile
  Wwrite-strings)

# cmake-format: off
#list(APPEND REQUESTED_WARNING_FLAGS Werror)
#list(APPEND REQUESTED_WARNING_FLAGS Wredundant-tags)
#list(APPEND REQUESTED_WARNING_FLAGS Wnull-dereference)
#list(APPEND REQUESTED_WARNING_FLAGS Wconversion)
#list(APPEND REQUESTED_WARNING_FLAGS Wzero-as-null-pointer-constant)
#list(APPEND REQUESTED_WARNING_FLAGS Wuseless-cast)
#list(APPEND REQUESTED_WARNING_FLAGS Wsuggest-override)
#list(APPEND REQUESTED_WARNING_FLAGS Wsuggest-final-types)
#list(APPEND REQUESTED_WARNING_FLAGS Wsuggest-final-methods)
#list(APPEND REQUESTED_WARNING_FLAGS Wsign-promo)
#list(APPEND REQUESTED_WARNING_FLAGS Wold-style-cast)
#list(APPEND REQUESTED_WARNING_FLAGS Walloc-zero)
# cmake-format: on

if(DYNINST_EXTRA_WARNINGS)
  list(APPEND REQUESTED_WARNING_FLAGS ${DYNINST_EXTRA_WARNINGS})
  message(
    STATUS "DYNINST_EXTRA_WARNINGS set, adding extra warnings:  ${DYNINST_EXTRA_WARNINGS}"
    )
endif()

if(DYNINST_WARNINGS_AS_ERRORS)
  list(APPEND REQUESTED_WARNING_FLAGS "Werror")
  message(STATUS "DYNINST_WARNINGS_AS_ERRORS set: treating warnings as errors")
endif()

# If not building with OpenMP or if static libs are enabled, ignore OpenMP pragma
# warnings
if(NOT USE_OpenMP OR ENABLE_STATIC_LIBS)
  list(APPEND REQUESTED_WARNING_FLAGS "Wno-unknown-pragmas")
endif()

if(CMAKE_C_COMPILER_ID MATCHES "^(GNU|Clang)$")
  include(CheckCCompilerFlag)
  foreach(f IN LISTS REQUESTED_WARNING_FLAGS)
    string(REGEX REPLACE "[^a-zA-Z0-9]" "_" v "HAS_C_FLAG_${f}")
    set(CMAKE_REQUIRED_FLAGS "-${f}")
    check_c_source_compiles("int main(){return 0;}" "${v}" FAIL_REGEX
                            "warning: *command[- ]line option|-Wunknown-warning-option")
    # Previous two lines are equivalent to below, but also catches a 0 exit status
    # with a warning message output: check_c_compiler_flag("-${f}" "${v}")
    if(${v})
      list(APPEND SUPPORTED_C_WARNING_FLAGS "-${f}")
      if(f MATCHES "^(.*)=[0-9]+$")
        # set generic variable if warning is parameterized with a number
        string(REGEX REPLACE "[^a-zA-Z0-9]" "_" v "HAS_C_FLAG_${CMAKE_MATCH_1}")
        set("${v}" 1)
      endif()
    endif()
  endforeach()
endif()

if(CMAKE_CXX_COMPILER_ID MATCHES "^(GNU|Clang)$")
  include(CheckCXXCompilerFlag)
  foreach(f IN LISTS REQUESTED_WARNING_FLAGS)
    string(REGEX REPLACE "[^a-zA-Z0-9]" "_" v "HAS_CPP_FLAG_${f}")
    set(CMAKE_REQUIRED_FLAGS "-${f}")
    check_cxx_source_compiles("int main(){return 0;}" "${v}" FAIL_REGEX
                              "warning: *command[- ]line option|-Wunknown-warning-option")
    if(${v})
      list(APPEND SUPPORTED_CXX_WARNING_FLAGS "-${f}")
      if(f MATCHES "^(.*)=[0-9]+$")
        string(REGEX REPLACE "[^a-zA-Z0-9]" "_" v "HAS_CPP_FLAG_${CMAKE_MATCH_1}")
        set("${v}" 1)
      endif()
    endif()
  endforeach()
endif()

# cmake-format: off
# If -Wframe-larger-than is available adjust the value to allow for larger frames based on
# compiler version and build type for the following 3 files:
#
# instructionAPI/src/InstructionDecoder-power.C (includes instructionAPI/src/power-opcode-table.C)
# instructionAPI/src/AMDGPU/gfx90a/InstructionDecoder-amdgpu-gfx90a.C (includes instructionAPI/src/AMDGPU/gfx90a/finalizeOperands.C)
# common/src/MachSyscall.C (includes common/src/SyscallInformation.C)
# cmake-format: on
#
if(HAS_CPP_FLAG_Wframe_larger_than AND NOT DYNINST_DISABLE_DIAGNOSTIC_SUPPRESSIONS)
  # Override the default frame size maximum for DEBUG (-O0) build types as there stack
  # frames are larger:
  #
  add_compile_options($<$<CONFIG:DEBUG>:-Wframe-larger-than=${defaultDebugMaxFrameSize}>)

  # Use worst-case values discovered so far.  For most gcc versions SyscallInformation.C
  # stack frame size is less than than the default and InstructionDecoder-power.C is
  # less than 76800, but for some environments and compiler configurations the following
  # are needed:
  #
  if(${CMAKE_CXX_COMPILER_ID} STREQUAL "GNU")
    set(debugMaxFrameSizeOverrideSyscallInformation 81920)
    set(debugMaxFrameSizeOverridePowerOpcodeTable 358400)
    if(${CMAKE_CXX_COMPILER_VERSION} MATCHES "^[7](\.|$)")
      set(nonDebugMaxFrameSizeOverridePowerOpcodeTable 38912)
    endif()
    # most gcc's are under the default using -Og, but rhel's requires 30000
    set(debugMaxFrameSizeOverrideFinalizeOperands 30000)
    if(${CMAKE_CXX_COMPILER_VERSION} MATCHES "^[6](\.|$)")
      set(nonDebugMaxFrameSizeOverrideFinalizeOperands 30000)
    endif()
  elseif(${CMAKE_CXX_COMPILER_ID} STREQUAL "Clang")
    if(${CMAKE_CXX_COMPILER_VERSION} MATCHES "^1[3-7](\.|$)")
      set(debugMaxFrameSizeOverridePowerOpcodeTable 40000)
    else()
      set(debugMaxFrameSizeOverridePowerOpcodeTable 30000)
    endif()
    set(nonDebugMaxFrameSizeOverridePowerOpcodeTable 38000)
    set(debugMaxFrameSizeOverrideFinalizeOperands 29000)
    set(nonDebugMaxFrameSizeOverrideFinalizeOperands 29000)
  endif()
endif()

unset(CMAKE_REQUIRED_FLAGS)

if(MSVC)
  message(STATUS "TODO: Set up custom warning flags for MSVC")
endif()

message(STATUS "Using C warning flags: ${SUPPORTED_C_WARNING_FLAGS}")
message(STATUS "Using CXX warning flags: ${SUPPORTED_CXX_WARNING_FLAGS}")
message(
  STATUS "Extra CXX DEBUG warning flags: -Wframe-larger-than=${defaultDebugMaxFrameSize}")