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Diving into
HHVM Extensions
James Titcumb
PHPNW Conference 2015
James Titcumb
www.jamestitcumb.com
www.roave.com
www.phphants.co.uk
www.phpsouthcoast.co.uk
@asgrim
Who is this guy?
First, some background...
source: Microsoft
Diving into HHVM Extensions (PHPNW Conference 2015)
Diving into HHVM Extensions (PHPNW Conference 2015)
Diving into HHVM Extensions (PHPNW Conference 2015)
How PHP works
PHP code
OpCache
Execute (VM)
Lexer + Parser
Compiler
How HHVM works
PHP code
OpCache
Execute (VM)
Lexer + Parser
Compiler
JIT
Execute (Native)
Hack features
● Return/parameter type hints
● ?nullable
● Collections (Vectors, Sets, Maps, etc.)
● Async functions
● Enums
● Generics
● Lambda expressions ==>
● XHP
● more stuff
The HHVM codebase
The Engine
hphp/parser
The Engine
hphp/parser
hphp/compiler
The Engine
hphp/parser
hphp/compiler
hphp/hhbbc
The Engine
hphp/parser
hphp/compiler
hphp/hhbbc
hphp/hhvm
The Engine
hphp/parser
hphp/compiler
hphp/hhbbc
hphp/hhvm
hphp/runtime/vm
The Engine
hphp/parser
hphp/compiler
hphp/hhbbc
hphp/hhvm
hphp/runtime/vm
hphp/runtime/vm/jit
The Extensions
hphp/runtime/ext
The Extensions
hphp/runtime/ext
hphp/system/php
Compile HHVM?
source: https://xkcd.com/303/
My First HHVM Extension™
config.cmake
HHVM_EXTENSION(calc ext_calc.cpp)
ext_calc.cpp
#include "hphp/runtime/ext/extension.h"
namespace HPHP {
static class CalcExtension : public Extension {
public:
CalcExtension(): Extension("calc") {}
virtual void moduleInit() {}
} s_calc_extension;
HHVM_GET_MODULE(calc);
} // namespace HPHP
ext_calc.cpp
#include "hphp/runtime/ext/extension.h"
namespace HPHP {
static class CalcExtension : public Extension {
public:
CalcExtension(): Extension("calc") {}
virtual void moduleInit() {}
} s_calc_extension;
HHVM_GET_MODULE(calc);
} // namespace HPHP
ext_calc.cpp
#include "hphp/runtime/ext/extension.h"
namespace HPHP {
static class CalcExtension : public Extension {
public:
CalcExtension(): Extension("calc") {}
virtual void moduleInit() {}
} s_calc_extension;
HHVM_GET_MODULE(calc);
} // namespace HPHP
ext_calc.cpp
#include "hphp/runtime/ext/extension.h"
namespace HPHP {
static class CalcExtension : public Extension {
public:
CalcExtension(): Extension("calc") {}
virtual void moduleInit() {}
} s_calc_extension;
HHVM_GET_MODULE(calc);
} // namespace HPHP
ext_calc.cpp
#include "hphp/runtime/ext/extension.h"
namespace HPHP {
static class CalcExtension : public Extension {
public:
CalcExtension(): Extension("calc") {}
virtual void moduleInit() {}
} s_calc_extension;
HHVM_GET_MODULE(calc);
} // namespace HPHP
… that’s it.
<?php
var_dump(extension_loaded('calc'));
test.php
Compile it.
(waaaat?!)
Compile & run the test
#!/bin/bash
hphpize
cmake . && make
/usr/bin/hhvm 
-d extension_dir=. 
-d hhvm.extensions[]=calc.so 
test.php
Compile & run the test
$ ./build.sh
bool(true)
$
Hack it!
source: http://goo.gl/kUAxBI
config.cmake
HHVM_EXTENSION(calc ext_calc.cpp)
HHVM_SYSTEMLIB(calc ext_calc.php)
ext_calc.cpp
#include "hphp/runtime/ext/extension.h"
namespace HPHP {
static class CalcExtension : public Extension {
public:
CalcExtension(): Extension("calc") {}
virtual void moduleInit() {
loadSystemlib();
}
} s_calc_extension;
HHVM_GET_MODULE(calc);
} // namespace HPHP
ext_calc.php
<?hh
function calc_sub(int $a, int $b): int {
return $a - $b;
}
… that’s it.
<?php
var_dump(extension_loaded('calc'));
var_dump(calc_sub(5, 3));
test.php
Compile & run the test
$ ./build.sh
bool(true)
int(2)
$
Sprinkle some C++ in
for good measure
ext_calc.cpp
// ... SNIP ...
virtual void moduleInit() {
HHVM_FE(calc_add);
loadSystemlib();
}
// ... SNIP ...
ext_calc.cpp
// ... SNIP ...
static int64_t HHVM_FUNCTION(calc_add, int64_t a, int64_t b) {
return a + b;
}
// ... SNIP ...
in php extensions...
PHP_FUNCTION(calc_add)
{
// ... SNIP ...
#ifndef FAST_ZPP
if (zend_parse_parameters(ZEND_NUM_ARGS(), "ll", &a, &b) == FAILURE) {
return;
}
#else
ZEND_PARSE_PARAMETERS_START(2, 2)
Z_PARAM_LONG(a)
Z_PARAM_LONG(b)
ZEND_PARSE_PARAMETERS_END();
#endif
// ... SNIP ...
ext_calc.php
<?hh
<<__Native>>
function calc_add(int $a, int $b): int;
function calc_sub(int $a, int $b): int {
return $a - $b;
}
… that’s it.
<?php
var_dump(extension_loaded('calc'));
var_dump(calc_sub(5, 3));
var_dump(calc_add(5, 3));
test.php
Compile & run the test
$ ./build.sh
bool(true)
int(2)
int(8)
$
Debugging?!
source: http://www.gnu.org/software/gdb/
Add debug mode
#!/bin/bash
hphpize
cmake 
-DCMAKE_C_FLAGS="-O0 -ggdb3" 
-DCMAKE_CXX_FLAGS="-O0 -ggdb3" 
-DCMAKE_BUILD_TYPE=Debug 
.
make
# ... SNIP ...
Run with gdb
$ gdb --args 
/usr/bin/hhvm 
-d extension_dir=. 
-d hhvm.extensions[]=calc.so 
test.php
GNU gdb (Ubuntu 7.9-1ubuntu1) 7.9
Copyright (C) 2015 Free Software Foundation, Inc.
License GPLv3+: GNU GPL version 3 or later <http://gnu.
org/licenses/gpl.html>
--- snip ---
Reading symbols from /usr/bin/hhvm...done.
(gdb)
Breakpoints
(gdb) b ext_calc.cpp:6
No source file named ext_calc.cpp.
Make breakpoint pending on future shared library load? (y or [n]) y
Breakpoint 1 (ext_calc.cpp:6) pending.
(gdb)
Running
(gdb) r
Starting program: /usr/bin/hhvm -d extension_dir=. -d hhvm.extensions[]
=calc.so smoke.php
[Thread debugging using libthread_db enabled]
Using host libthread_db library "/lib/x86_64-linux-gnu/libthread_db.so.1".
Breakpoint 2, HPHP::f_calc_add (a=5, b=3) at /home/james/workspace/hhvm-
calc/ext_calc.cpp:6
6 return a + b;
(gdb) p a
$1 = 5
(gdb) p b
$2 = 3
(gdb)
Handy commands
c continue / step out
n step over
s step into
p x print the value of a variable (x)
set x = y set a variable (x) to value (y)
bt print backtrace
q quit :)
When NOT to write extensions
When to write extensions
BUCKLE UP.
source: https://goo.gl/x7Srhe
Integrating OpenGL
into an HHVM extension
Don’t try this in
production!
srsly.
Extension
Browser
What I did
Diving into HHVM Extensions (PHPNW Conference 2015)
huh?!
Make it OOOOOOO
ext_foo.php
<?hh
<<__NativeData("Foo")>>
class Foo {
<<__Native>>
public function bar(): int;
}
C++ object
!==
PHP object
source: http://goo.gl/HORwLQ
HHVM Universe
<?php
$o = new Foo();
$o->bar();
PHP Land
class Foo {
public:
Foo() {}
~Foo() {}
int value = 5;
}
Planet C++
int64_t HHVM_METHOD(Foo,bar)
{
auto data =
Native::data<Foo>(this_);
return data->value;
}
Time Vortex!?!?!
C++ object !== PHP object
HHVM Universe
<?php
$o = new Foo();
$o->bar();
PHP Land
class Foo {
public:
Foo() {}
~Foo() {}
int value = 5;
}
Planet C++
int64_t HHVM_METHOD(Foo,bar)
{
auto data =
Native::data<Foo>(this_);
return data->value;
}
Time Vortex!?!?!
C++ object !== PHP object
HHVM Universe
<?php
$o = new Foo();
$o->bar();
PHP Land
class Foo {
public:
Foo() {}
~Foo() {}
int value = 5;
}
Planet C++
int64_t HHVM_METHOD(Foo,bar)
{
auto data =
Native::data<Foo>(this_);
return data->value;
}
Time Vortex!?!?!
C++ object !== PHP object
HHVM Universe
<?php
$o = new Foo();
$o->bar();
PHP Land
class Foo {
public:
Foo() {}
~Foo() {}
int value = 5;
}
Planet C++
int64_t HHVM_METHOD(Foo,bar)
{
auto data =
Native::data<Foo>(this_);
return data->value;
}
Time Vortex!?!?!
C++ object !== PHP object
this slide is intentionally left blank
ext_foo.php
<?hh
class Foo {
private int $value
public function bar(): int
{
return $this->value;
}
}
Demo?
Diving into HHVM Extensions (PHPNW Conference 2015)
source: http://goo.gl/7gWfNz
Resources
● OpenGL Tutorial
○ http://www.opengl-tutorial.org/
● HHVM Example Extension
○ https://github.com/hhvm/extension-example
● Sara Golemon - HHVM extension blog series
○ http://blog.golemon.com/2015/01/hhvm-extension-writing-part-iii.html
● Derick Rethans’ extension API cookbook
○ https://github.com/derickr/hhvm-hni-cookbook
● The official API documentation
○ https://github.com/facebook/hhvm/wiki/Extension%20API
● Journey of a Thousand Bytecodes
○ http://hhvm.com/blog/6323/the-journey-of-a-thousand-bytecodes
Any questions? :)
https://joind.in/15434
James Titcumb @asgrim

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