Re: Android Arm issues
- From: Kaj Eijlers <bizziboi@xxxxxxxxx>
- To: luajit@xxxxxxxxxxxxx
- Date: Thu, 10 May 2012 06:04:07 -0700
I'd say lua_tointeger depends on the underlying machine word size. On a 32
bit platform this would be max 7fffffff since integer is signed.
Have you verified this is a luajit issue and not expected lua behaviour?
On Thu, May 10, 2012 at 3:35 AM, Fredrik Ehnbom <quarnster@xxxxxxxxx> wrote:
> Hi,
>
> I'm having an issue with LuaJit on ARM android. Large parts of my scripts
> work great, but for some reason lua_tointeger doesn't return what I'm
> expecting.
>
> On android the output of this little reproduction case is:
> $ adb shell /data/repro
> 0x400fe1c0
> 0
> 0
> 7fffffff, 2852126720.000000
> Segmentation fault
>
> Whereas on OSX it is the expected:
> $ ./repro
> 0x42378
> 0
> 0
> 0
> aa000000, 2852126720.000000
>
> Any idea why tointeger would differ so much? The right number is clearly
> there as shown by the tonumber call... Any number up to and
> including 7fffffff will be correct on android, but 80000000 and above gets
> "clamped" to 7fffffff.
>
> Is there any compiler flag or setting I've missed?
>
> Also, any idea why it's segfaulting at the end?
>
> BTW, I had to set TARGET_SYS=Linux when cross compiling for arm android on
> my MAC, otherwise lj_vm.s wouldn't assemble. Exact commands used to build
> LuaJit 2.0.0-beta10 were:
>
> NDK=~/android/android-ndk-r7
> NDKABI=8
> NDKVER=$NDK/toolchains/arm-linux-androideabi-4.4.3
> NDKP=$NDKVER/prebuilt/darwin-x86/bin/arm-linux-androideabi-
> NDKF="--sysroot $NDK/platforms/android-$NDKABI/arch-arm"
> make HOST_CC="gcc -m32" CROSS=$NDKP TARGET_FLAGS="$NDKF" TARGET_SYS=Linux
>
>
>
> Sources create my little sample that I'm having problems with:
>
>
>
>
> CMakeLists.txt:
> cmake_minimum_required(VERSION 2.8)
>
> if(ANDROID)
> set(CMAKE_REQUIRED_INCLUDES "${ANDROID_TOOLCHAIN_ROOT}/user/include")
> include_directories(${ANDROID_TOOLCHAIN_ROOT}/user/include/luajit-2.0/)
> link_directories(${ANDROID_TOOLCHAIN_ROOT}/user/lib)
> else()
> set(CMAKE_CXX_FLAGS "${CMAKE_CXX_FLAGS} -pagezero_size 10000
> -image_base 100000000")
> include_directories(/usr/local/include/luajit-2.0)
> endif()
>
> add_executable(repro repro.cpp)
> target_link_libraries(repro luajit-5.1)
>
>
>
>
> repro.cpp:
>
>
> #include <lua.hpp>
> #include <stdio.h>
>
>
> int main(int argc, char **argv)
> {
> lua_State *L = luaL_newstate();
> printf("%p\n", L);
> LUAJIT_VERSION_SYM();
> lua_gc(L, LUA_GCSTOP, 0);
> luaL_openlibs(L);
> lua_gc(L, LUA_GCRESTART, -1);
>
> printf("%d\n", luaL_dostring(L, "background_color = 0xaa000000"));
> printf("%d\n", luaL_dostring(L, "return background_color"));
>
> printf("%x, %f\n", lua_tointeger(L, -1), lua_tonumber(L, -1));
> lua_close(L);
> return 0;
> }
>
>
> Cheers,
>
> /f
>
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