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79 lines
2.7 KiB
79 lines
2.7 KiB
==================================
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Status of Emscripten compatibility
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==================================
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Hello world test
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================
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Quick hello world test::
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$ ./emcc --memory-init-file 0 tests/hello_world.cpp -o /tmp/test.js
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$ duk /tmp/test.js
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Tweaks needed:
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* ``--memory-init-file 0``: don't use an external memory file.
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Normally this suffices. If you're running Duktape with a small amount of
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memory (e.g. when running the Duktape command line tool with the ``-r``
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option) you may need to reduce Emscription "virtual memory" size with the
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following additional options:
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* ``-s TOTAL_MEMORY=2097152``: reduce total memory size to avoid running
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out of memory.
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* ``-s TOTAL_STACK=524288``: reduce total stack size to fit it into the
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reduced memory size.
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Changes in Duktape versions:
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* Since Duktape 1.3 there is support for ES2015 TypedArrays which allow
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Emscripten to run better than with Duktape 1.2, and also allows use of
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Emscripten fastcomp.
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* Since Duktape 1.5 no fixups are needed to run Emscripten-generated code:
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Duktape now accepts non-standard unescaped curly braces in regexps, and
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the Function ``.toString()`` output was changed to be acceptable to the
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Emscripten regexps. Earlier a fixup script was needed::
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$ python $DUKTAPE/util/fix_emscripten.py < /tmp/test.js > /tmp/test-fixed.js
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Setting up fastcomp for Duktape
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===============================
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To build dukweb.js and to use Makefile targets like ``emscriptentest`` you
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need Emscripten "fastcomp". Example steps to setup emscripten:
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* Compile fastcomp manually:
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- https://kripken.github.io/emscripten-site/docs/building_from_source/building_fastcomp_manually_from_source.html
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- The ``LLVM_ROOT`` path in the documentation seems to be outdated,
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``.../build/bin`` should apparently be ``.../build/Release/bin``
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* Checkout emscripten::
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$ cd (duktape)
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$ make emscripten # duktape checkouts emscripten master
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* Create a ``~/.emscripten`` file which uses your manually compiled fastcomp.
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You can create a default configuration as follows::
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$ cd (duktape)/emscripten
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$ ./emcc # creates ~/.emscripten if it doesn't exist
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Then change Emscripten to use the manually compiled fastcomp by changing
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the LLVM_ROOT line in ``~/.emscripten`` to point to your fastcomp build::
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LLVM_ROOT = '/home/user/myfastcomp/emscripten-fastcomp/build/Release/bin'
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You should now be able to build dukweb.js and run Emscripten Makefile
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targets::
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$ make emscripteninceptiontest
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[...]
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emscripten/emcc -O2 -std=c99 -Wall --memory-init-file 0 -Idist/src dist/src/duktape.c dist/examples/hello/hello.c -o /tmp/duk-emcc-test.js
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[...]
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./duk /tmp/duk-emcc-test-fixed.js
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Hello world!
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2+3=5
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