CMakeLists.txt

cmake_minimum_required(VERSION 3.8)
project(snmalloc)



if (NOT CMAKE_BUILD_TYPE)
  message(STATUS "No build type selected, default to: Release")
  set(CMAKE_BUILD_TYPE "Release")
endif()

include(CheckCXXCompilerFlag)
include(CheckCSourceCompiles)

option(USE_SNMALLOC_STATS "Track allocation stats" OFF)
option(SNMALLOC_CI_BUILD "Disable features not sensible for CI" OFF)
option(USE_MEASURE "Measure performance with histograms" OFF)
option(EXPOSE_EXTERNAL_PAGEMAP "Expose the global pagemap" OFF)
option(EXPOSE_EXTERNAL_RESERVE "Expose an interface to reserve memory using the default memory provider" OFF)
option(SNMALLOC_RUST_SUPPORT "Build static library for rust" OFF)
option(SNMALLOC_STATIC_LIBRARY   "Build static libraries" ON)
option(SNMALLOC_QEMU_WORKAROUND "Disable using madvise(DONT_NEED) to zero memory on Linux" Off)
option(SNMALLOC_OPTIMISE_FOR_CURRENT_MACHINE "Compile for current machine architecture" Off)
option(ENABLE_WASI "enable snmalloc for wasi environment" ON)

set(CACHE_FRIENDLY_OFFSET OFF CACHE STRING "Base offset to place linked-list nodes.")
set(SNMALLOC_STATIC_LIBRARY_PREFIX "sn_" CACHE STRING "Static library function prefix")


if(ENABLE_WASI)

set( COMPILER_BIN /usr/local/vwasm/toolchain/bin)
set( WASM_SYSROOT /usr/local/vwasm/llvm-sysroot)

set( CMAKE_C_COMPILER ${COMPILER_BIN}/clang CACHE PATH "clang" FORCE )
set( CMAKE_CXX_COMPILER ${COMPILER_BIN}/clang++ CACHE PATH "clang++" FORCE )
set( CMAKE_AR ${COMPILER_BIN}/llvm-ar CACHE PATH "llvm-ar" FORCE )
set( CMAKE_LINKER ${COMPILER_BIN}/wasm-ld CACHE PATH "wasm-ld" FORCE )
set( CMAKE_RANLIB ${COMPILER_BIN}/llvm-ranlib CACHE PATH "llvm-ranlib" FORCE )
set( CMAKE_STRIP ${COMPILER_BIN}/llvm-strip CACHE PATH "llvm-strip" FORCE )
set( CMAKE_OBJCOPY ${COMPILER_BIN}/llvm-strip CACHE PATH "llvm-strip" FORCE )
set( CMAKE_NM ${COMPILER_BIN}/llvm-nm CACHE PATH "llvm-nm" FORCE )
set( MUSL_INCLUDES ${CMAKE_CURRENT_SOURCE_DIR}/../libc-bottom-half/headers/public ${CMAKE_CURRENT_SOURCE_DIR}/../libc-bottom-half/headers/private ${CMAKE_CURRENT_SOURCE_DIR}/../libc-top-half/musl/include)




endif()


CHECK_C_SOURCE_COMPILES("
#include <malloc.h>
size_t malloc_usable_size(const void* ptr) { return 0; }
int main() { return 0; }
" CONST_QUALIFIED_MALLOC_USABLE_SIZE)

if ((CMAKE_BUILD_TYPE STREQUAL "Release") AND (NOT SNMALLOC_CI_BUILD))
  option(USE_POSIX_COMMIT_CHECKS "Instrument Posix PAL to check for access to unused blocks of memory." Off)
else ()
  option(USE_POSIX_COMMIT_CHECKS "Instrument Posix PAL to check for access to unused blocks of memory." On)
endif ()

# Provide as macro so other projects can reuse
macro(warnings_high)
  if(MSVC)
    # Force to always compile with W4
    if(CMAKE_CXX_FLAGS MATCHES "/W[0-4]")
      string(REGEX REPLACE "/W[0-4]" "/W4" CMAKE_CXX_FLAGS "${CMAKE_CXX_FLAGS}")
    else()
      set(CMAKE_CXX_FLAGS "${CMAKE_CXX_FLAGS} /W4")
    endif()
    add_compile_options(/WX /wd4127 /wd4324 /wd4201)
  else()
    if (CMAKE_CXX_COMPILER_ID MATCHES "Clang")
      add_compile_options(-Wsign-conversion)
    endif ()
    #add_compile_options(-Wall -Wextra -Werror -Wundef -Wno-unused-parameter)
  endif()
endmacro()


macro(clangformat_targets)
  # The clang-format tool is installed under a variety of different names.  Try
  # to find a sensible one.  Only look for versions 9 explicitly - we don't
  # know whether our clang-format file will work with newer versions of the
  # tool.  It does not work with older versions as AfterCaseLabel is not supported
  # in earlier versions.
 # find_program(CLANG_FORMAT NAMES  clang-format-9)

  # If we've found a clang-format tool, generate a target for it, otherwise emit
  # a warning.
  if (${CLANG_FORMAT} STREQUAL "CLANG_FORMAT-NOTFOUND")
    message(WARNING "Not generating clangformat target, no clang-format tool found")
  else ()
    message(STATUS "Generating clangformat target using ${CLANG_FORMAT}")
    file(GLOB_RECURSE ALL_SOURCE_FILES *.cc *.h *.hh)
    add_custom_target(
      clangformat
      COMMAND ${CLANG_FORMAT}
      -i
      ${ALL_SOURCE_FILES})
  endif()
endmacro()

# The main target for snmalloc
add_library(snmalloc_lib INTERFACE)
target_include_directories(snmalloc_lib INTERFACE src/) 
add_compile_options(--target=wasm32-wasi -fno-trapping-math --sysroot=${WASM_SYSROOT} -fno-exceptions)#-nostdinc++ -nostdinc

#/opt/wasi-sdk/share/wasi-sysroot/include/c++/v1/
#${MUSL_INCLUDES}
#target_include_directories(snmalloc_lib INTERFACE /opt/wasi-sdk/share/wasi-sysroot/include/c++/v1/ /opt/wasi-sdk/share/wasi-sysroot/include )   



if(NOT MSVC)
  #find_package(Threads REQUIRED COMPONENTS snmalloc_lib)
  target_link_libraries(snmalloc_lib INTERFACE ${CMAKE_THREAD_LIBS_INIT})
  if("${CMAKE_CXX_COMPILER_ID}" STREQUAL "GNU")
    target_link_libraries(snmalloc_lib INTERFACE atomic)
  endif()

endif()

if (WIN32)
  set(WIN8COMPAT FALSE CACHE BOOL "Avoid Windows 10 APIs")
  if (WIN8COMPAT)
    target_compile_definitions(snmalloc_lib INTERFACE -DWINVER=0x0603)
    message(STATUS "snmalloc: Avoiding Windows 10 APIs")
  else()
    message(STATUS "snmalloc: Using Windows 10 APIs")
    # VirtualAlloc2 is exposed by mincore.lib, not Kernel32.lib (as the
    # documentation says)
    target_link_libraries(snmalloc_lib INTERFACE mincore)
  endif()
endif()



# Have to set this globally, as can't be set on an interface target.
set(CMAKE_CXX_STANDARD 17)

if(USE_SNMALLOC_STATS)
  target_compile_definitions(snmalloc_lib INTERFACE -DUSE_SNMALLOC_STATS)
endif()

if(SNMALLOC_QEMU_WORKAROUND)
  target_compile_definitions(snmalloc_lib INTERFACE -DSNMALLOC_QEMU_WORKAROUND)
endif()

if(USE_MEASURE)
  target_compile_definitions(snmalloc_lib INTERFACE -DUSE_MEASURE)
endif()

if(SNMALLOC_CI_BUILD)
  target_compile_definitions(snmalloc_lib INTERFACE -DSNMALLOC_CI_BUILD)
endif()

if(CACHE_FRIENDLY_OFFSET)
  target_compile_definitions(snmalloc_lib INTERFACE -DCACHE_FRIENDLY_OFFSET=${CACHE_FRIENDLY_OFFSET})
endif()

if(USE_POSIX_COMMIT_CHECKS)
  target_compile_definitions(snmalloc_lib INTERFACE -DUSE_POSIX_COMMIT_CHECKS)
endif()

if(CONST_QUALIFIED_MALLOC_USABLE_SIZE)
  target_compile_definitions(snmalloc_lib INTERFACE -DMALLOC_USABLE_SIZE_QUALIFIER=const)
endif()

if(ENABLE_WASI)
  target_compile_definitions(snmalloc_lib INTERFACE -DENABLE_WASI -DWASM_ENV) 
endif()


# To build with just the header library target define SNMALLOC_ONLY_HEADER_LIBRARY
# in containing Cmake file.
if(NOT DEFINED SNMALLOC_ONLY_HEADER_LIBRARY)

  warnings_high()

  if(MSVC)
    set(CMAKE_CXX_FLAGS_RELEASE "${CMAKE_CXX_FLAGS_RELEASE} /Zi")
    set(CMAKE_EXE_LINKER_FLAGS_RELEASE "${CMAKE_EXE_LINKER_FLAGS_RELEASE} /DEBUG")
  else()
    add_compile_options(-fno-exceptions -fno-rtti -g -fomit-frame-pointer)
    # Static TLS model unsupported on Haiku
    if (NOT CMAKE_SYSTEM_NAME MATCHES "Haiku")
	    add_compile_options(-ftls-model=initial-exec)
    endif()
    if(SNMALLOC_CI_BUILD OR (${CMAKE_BUILD_TYPE} MATCHES "Debug"))
      # Get better stack traces in CI and Debug.
     # target_link_libraries(snmalloc_lib INTERFACE "-rdynamic") #not supported in wasi
    endif()

    if(SNMALLOC_OPTIMISE_FOR_CURRENT_MACHINE)
      check_cxx_compiler_flag(-march=native SUPPORT_MARCH_NATIVE)
      if (SUPPORT_MARCH_NATIVE)
        add_compile_options(-march=native)
      else()
        message(WARNING "Compiler does not support `-march=native` required by SNMALLOC_OPTIMISE_FOR_CURRENT_MACHINE")
      endif()
    endif()

  endif()

  macro(subdirlist result curdir)
    file(GLOB children LIST_DIRECTORIES true RELATIVE ${curdir} ${curdir}/*)
    set(dirlist "")
    foreach(child ${children})
      if(IS_DIRECTORY ${curdir}/${child})
        list(APPEND dirlist ${child})
      endif()
    endforeach()
    set(${result} ${dirlist})
  endmacro()

  macro(add_shim name type)
    add_library(${name} ${type} ${ARGN})
    target_link_libraries(${name} snmalloc_lib)
    if(NOT MSVC)
      target_compile_definitions(${name} PRIVATE "SNMALLOC_EXPORT=__attribute__((visibility(\"default\")))")
    endif()
    set_target_properties(${name} PROPERTIES CXX_VISIBILITY_PRESET hidden)

    if(EXPOSE_EXTERNAL_PAGEMAP)
      if(MSVC)
        target_compile_definitions(${name} PRIVATE /DSNMALLOC_EXPOSE_PAGEMAP)
      else()
        target_compile_definitions(${name} PRIVATE -DSNMALLOC_EXPOSE_PAGEMAP)
      endif()
    endif()

    if(EXPOSE_EXTERNAL_RESERVE)
      if(MSVC)
        target_compile_definitions(${name} PRIVATE /DSNMALLOC_EXPOSE_RESERVE)
      else()
        target_compile_definitions(${name} PRIVATE -DSNMALLOC_EXPOSE_RESERVE)
      endif()
    endif()

    # Ensure that we do not link against C++ stdlib when compiling shims.
    if(NOT MSVC)
      set_target_properties(${name} PROPERTIES LINKER_LANGUAGE C)
    endif()

  endmacro()

  if (SNMALLOC_STATIC_LIBRARY)
    add_shim(snmallocshim-static STATIC src/override/malloc.cc)
    add_shim(snmallocshim-1mib-static STATIC src/override/malloc.cc)
    target_compile_definitions(snmallocshim-1mib-static PRIVATE IS_ADDRESS_SPACE_CONSTRAINED
            SNMALLOC_STATIC_LIBRARY_PREFIX=${SNMALLOC_STATIC_LIBRARY_PREFIX})
    target_compile_definitions(snmallocshim-static PRIVATE
            SNMALLOC_STATIC_LIBRARY_PREFIX=${SNMALLOC_STATIC_LIBRARY_PREFIX})
  endif ()



endif()