# Copyright (C) 2019 Intel Corporation. All rights reserved.
# SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception

cmake_minimum_required(VERSION 3.14)

project(wamr_fuzzing LANGUAGES ASM C CXX)

include(CMakePrintHelpers)

# Ensure Clang is used as the compiler
if(NOT CMAKE_C_COMPILER_ID STREQUAL "Clang"
    OR NOT CMAKE_ASM_COMPILER_ID STREQUAL "Clang")
  message(FATAL_ERROR "Please use Clang as the C compiler for libFuzzer compatibility.")
endif()

#
# Global settings
#
set(CMAKE_BUILD_TYPE Debug)
set(CMAKE_C_STANDARD 11)
set(CMAKE_CXX_STANDARD 17)

string(TOLOWER ${CMAKE_HOST_SYSTEM_NAME} WAMR_BUILD_PLATFORM)

# Reset default linker flags
set(CMAKE_SHARED_LIBRARY_LINK_C_FLAGS "")
set(CMAKE_SHARED_LIBRARY_LINK_CXX_FLAGS "")

# Check if the compiler supports the sanitizer flags
include(CheckCXXCompilerFlag)
check_cxx_compiler_flag("-fsanitize=address"   HAS_ADDRESS_SANITIZER)
check_cxx_compiler_flag("-fsanitize=memory"    HAS_MEMORY_SANITIZER)
check_cxx_compiler_flag("-fsanitize=undefined" HAS_UNDEFINED_SANITIZER)

# Determine WAMR_BUILD_TARGET based on system properties
if(NOT DEFINED WAMR_BUILD_TARGET)
  if(CMAKE_SYSTEM_PROCESSOR MATCHES "^(arm64|aarch64)")
    set(WAMR_BUILD_TARGET "AARCH64")
  elseif(CMAKE_SYSTEM_PROCESSOR STREQUAL "riscv64")
    set(WAMR_BUILD_TARGET "RISCV64")
  elseif(CMAKE_SIZEOF_VOID_P EQUAL 8)
    set(WAMR_BUILD_TARGET "X86_64")
  elseif(CMAKE_SIZEOF_VOID_P EQUAL 4)
    set(WAMR_BUILD_TARGET "X86_32")
  else()
    message(SEND_ERROR "Unsupported build target platform!")
  endif()
endif()

if(APPLE)
  add_definitions(-DBH_PLATFORM_DARWIN)
endif()

# Disable hardware bound check and enable AOT validator
set(WAMR_DISABLE_HW_BOUND_CHECK 1)
set(WAMR_BUILD_AOT_VALIDATOR 1)

set(REPO_ROOT_DIR ${CMAKE_CURRENT_LIST_DIR}/../../..)
message(STATUS "REPO_ROOT_DIR: ${REPO_ROOT_DIR}")

# Use LLVM_DIR from command line if defined
# LLVM_DIR should be something like /path/to/llvm/build/lib/cmake/llvm
if(DEFINED LLVM_DIR)
  set(LLVM_DIR $ENV{LLVM_DIR})
else()
  set(LLVM_SRC_ROOT ${REPO_ROOT_DIR}/core/deps/llvm)
  set(LLVM_BUILD_ROOT ${LLVM_SRC_ROOT}/build)
  set(LLVM_DIR ${LLVM_BUILD_ROOT}/lib/cmake/llvm)
endif()

# if LLVM_DIR is an existing directory, use it
if(NOT EXISTS ${LLVM_DIR})
  message(FATAL_ERROR "LLVM_DIR not found: ${LLVM_DIR}")
endif()

find_package(LLVM REQUIRED CONFIG)

message(STATUS "Found LLVM ${LLVM_PACKAGE_VERSION}")
message(STATUS "Using LLVMConfig.cmake in: ${LLVM_DIR}")

include_directories(${LLVM_INCLUDE_DIRS})
separate_arguments(LLVM_DEFINITIONS_LIST NATIVE_COMMAND ${LLVM_DEFINITIONS})
add_definitions(${LLVM_DEFINITIONS_LIST})

set(SHARED_DIR ${REPO_ROOT_DIR}/core/shared)
set(IWASM_DIR ${REPO_ROOT_DIR}/core/iwasm)

# Global setting
add_compile_options(-Wno-unused-command-line-argument)

# Enable fuzzer
add_definitions(-DWASM_ENABLE_FUZZ_TEST=1)
add_compile_options(-fsanitize=fuzzer)
add_link_options(-fsanitize=fuzzer)

# Enable sanitizers if not in oss-fuzz environment
set(CFLAGS_ENV $ENV{CFLAGS})
string(FIND "${CFLAGS_ENV}" "-DFUZZING_BUILD_MODE_UNSAFE_FOR_PRODUCTION" IN_OSS_FUZZ)

add_subdirectory(aot-compiler)
add_subdirectory(wasm-mutator)