Good day! I am playing with llvm optimizer and I trying to setup build
process that allows me to run custom optimizations over bc. I want to:
1. Build resulting .bc of game (using llvm-link)
2. Transform this .bc with custom optimizations
3. Produce .js with emcc
For (1) I compile all source files into shared library (instead of js):
add_library(bin-lib SHARED ${SOURCES})
set_target_properties(bin-lib PROPERTIES SUFFIX .bc)
As I understand this step works perfect, because as a result I have one
libbin-lib.bc file.
For (2) I use this command:
~/emscripten/sdk/emscripten-fastcomp/bin/opt -O3 libbin-lib.bc -o
libbin-lib-opt.bc
For (3) I use this command:
~/emscripten/sdk/emscripten/emcc -O3 \
-s USE_ZLIB=1 -s USE_LIBPNG=1 -s USE_FREETYPE=1 -s USE_GLFW=3 -s
FULL_ES2=1 \
--emit-symbol-map \
-s ASSERTIONS=0 \
-s SAFE_HEAP=0 \
-s TOTAL_MEMORY=134217728 \
-s INVOKE_RUN=0 \
-s EXTRA_EXPORTED_RUNTIME_METHODS="['getMemory', 'addRunDependency',
'removeRunDependency', 'FS_createPath', 'FS_createPreloadedFile', \
'FS_createDataFile', 'lengthBytesUTF8', 'stringToUTF8']" \
-s NO_EXIT_RUNTIME=1 \
libbin-lib-opt.bc -o bin.js
If I build my game with this steps:
(1) -> (3) (skip 2)
Then I have working bin.js. I can play game exactly the same as when I
compile just .js file with emcc.
BUT, if I build my game with this steps:
(1) -> (2) -> (3)
Then I have bin.js that produce errors in browser:
Invalid function pointer called with signature 'vi'. Perhaps this is an
invalid value (e.g. caused by calling a virtual method on a NULL pointer)?
Or calling a function with an incorrect type, which will fail? (it is worth
building your source files with -Werror (warnings are errors), as warnings
can indicate undefined behavior which can cause this)
This pointer might make sense in another type signature: v: 0 vid: 0 vii: 0
vidd: 0 vidi: 0 viid: 0 viii: 0 viddi: 0 viidi: 0 viiii: 0 vidddd: 0
viiiii: 0 viddddd: 0 viiiiii: 0 vidddddi: 0 viiiiiii: 0 vidddddii: 0
viiddiidii: 0 viiiiiiiii: 0 i: 0 di: 0 ii: 0 dii: 0 iid: 0 iii: 0 diid: 0
iidi: 0 iiii: 0 iiiid: 0 iiiii: 0 iiiiid: 0 iiiiii: 0 iiiiddd: 0 iiiiiid: 0
iiiiiii: 0 iiiiiiii: 0 iiiiiiiii: 0 iiiiiiiiii: 0
uncaught exception: abort(20) at
jsStackTrace@http://localhost/gamepix-loader.js line 168 > Function:3:40923
stackTrace@http://localhost/gamepix-loader.js line 168 > Function:3:41094
abort@http://localhost/gamepix-loader.js line 168 > Function:26:243921
nullFunc_vi@http://localhost/gamepix-loader.js line 168 > Function:3:326758
b20@http://localhost/gamepix-loader.js line 168 > Function:19:112979
__ZNSt3__214__shared_count16__release_sharedEv@http://localhost/gamepix-loader.js
line 168 > Function:19:45045
__ZNSt3__26localeD2Ev@http://localhost/gamepix-loader.js line 168 >
Function:16:660576
__ZNSt3__210__stdinbufIcEC2EP8_IO_FILEP11__mbstate_t@http://localhost/gamepix-loader.js
line 168 > Function:16:635917
__ZNSt3__28ios_base4InitC2Ev@http://localhost/gamepix-loader.js line 168 >
Function:16:633585
___cxx_global_var_init@http://localhost/gamepix-loader.js line 168 >
Function:16:633478
__GLOBAL__I_000101@http://localhost/gamepix-loader.js line 168 >
Function:16:633365
Error exists if i use any level of optimizations on opt step (O1, O2, O3)
If I set --llvm-opts 0, on emcc step error still exists
Can you help me?
Thank you
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