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141 lines
4.4 KiB
Markdown
141 lines
4.4 KiB
Markdown
V8Js on GNU/Linux
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=================
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Installation of V8Js on GNU/Linux is pretty much straight forward.
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First you need to decide if you can go with a V8 library that is
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shipped with your GNU/Linux distribution or whether you would want
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to compile V8 on your own.
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Many GNU/Linux distributions, for example Debian/Ubuntu, have
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recent V8 library versions installable, that are ready to be used.
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In order to go with these, just `sudo apt-get install libv8-dev`
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(or similar, as it fits your distribution).
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If you compile V8 on your own, it is recommended to install the V8
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version for V8Js off your system's load path, so it doesn't interfere
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with the V8 library shipped with your system's distribution.
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Snapshots
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---------
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V8 has (optional) support for so-called snapshots which speed up startup
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performance drastically. Hence they are generally recommended for use.
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There are two flavours of snapshots: internal & external.
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Internal snapshots are built right into the V8 library (libv8.so file),
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so there's no need to handle them specially.
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Besides there are external snapshots (which are enabled unless configured
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otherwise). If V8 is compiled with these, then V8Js needs to provide two
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"binary blobs" to V8, named `natives_blob.bin` and `snapshot_blob.bin`.
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In that case copy those two files to the same directory `libv8.so` was
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installed to.
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Pointer Compression
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-------------------
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V8 versions 8.0 and higher enable pointer compression by default.
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See [the design document](https://docs.google.com/document/d/10qh2-b4C5OtSg-xLwyZpEI5ZihVBPtn1xwKBbQC26yI/edit)
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for details.
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Hence if you use one of the recent version (which you really should),
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then you
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a) either need to manually disable pointer compression during
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the build of the library by passing the
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`v8_enable_pointer_compression=false` flag to `v8gen.py`
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b) or compile php-v8js with pointer compression as well, by adding
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`CPPFLAGS="-DV8_COMPRESS_POINTERS"` to the `./configure` call.
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Sandbox
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-------
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V8 has optional sandbox support. You need to compile php-v8js with matching
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configurations. If your V8 library was called with sandbox support, you
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need to pass the `-DV8_ENABLE_SANDBOX` flag to the configure call.
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By default V8 currently enables this feature.
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Many GNU/Linux distributions currently seem to have sandbox feature turned
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off however.
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If you configure it the wrong way round, you'll get runtime errors like this,
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as soon as php-v8js tries to initialize V8:
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```
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Embedder-vs-V8 build configuration mismatch. On embedder side sandbox is DISABLED while on V8 side it's ENABLED.
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```
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In order to compile V8 with sandbox support off, pass `v8_enable_sandbox=false`
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to v8gen.py invocation.
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Compile V8 5.6 and newer (using GN)
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-----------------------------------
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```
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# Install required dependencies
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sudo apt-get install build-essential curl git python3 libglib2.0-dev
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cd /tmp
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# Install depot_tools first (needed for source checkout)
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git clone https://chromium.googlesource.com/chromium/tools/depot_tools.git
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export PATH=`pwd`/depot_tools:"$PATH"
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# Download v8
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fetch v8
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cd v8
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# (optional) If you'd like to build a certain version:
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git checkout 12.0.267.36
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gclient sync -D
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# Setup GN
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tools/dev/v8gen.py -vv x64.release -- is_component_build=true use_custom_libcxx=false
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# Build
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ninja -C out.gn/x64.release/
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# Install to /opt/v8/
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sudo mkdir -p /opt/v8/{lib,include}
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sudo cp out.gn/x64.release/lib*.so out.gn/x64.release/*_blob.bin \
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out.gn/x64.release/icudtl.dat /opt/v8/lib/
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sudo cp -R include/* /opt/v8/include/
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```
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On Debian Stretch you need to set RPATH on the installed libraries,
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so the library loader finds the dependencies:
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```
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sudo apt-get install patchelf
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for A in /opt/v8/lib/*.so; do sudo patchelf --set-rpath '$ORIGIN' $A; done
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```
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Compile php-v8js itself
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-----------------------
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```
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cd /tmp
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git clone https://github.com/phpv8/v8js.git
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cd v8js
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phpize
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./configure --with-v8js=/opt/v8 LDFLAGS="-lstdc++" CPPFLAGS="-DV8_COMPRESS_POINTERS -DV8_ENABLE_SANDBOX"
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make
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make test
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sudo make install
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```
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Then add `extension=v8js.so` to your php.ini file. If you have a separate configuration for CLI, add it there also.
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V8Js' build system assumes that the `icudtl.dat` file is located next to the `libv8.so`
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library file and compiles the path into the library itself. If for whatever reason the
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`icudtl.dat` file is stored at a different place during runtime, you need to set the
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php.ini variable `v8js.icudtl_dat_path` to point to the file. Otherwise locale-aware
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features of V8 will not work as expected.
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