13.6.2 Source Maps in PHP7

Haxe source code positions in call stack and exception stack.

Since 3.4.1, Haxe can generate source maps for the PHP target when compiling with the -D php7 and -D source_map flags. Generated source maps can be utilized by the JStack library to automatically transform haxe.CallStack.callStack(), haxe.CallStack.exceptionStack() and uncaught exceptions to make them point at Haxe sources instead of generated PHP files.

class Main {
    static function main() {
        terribleError();
    }

    static function terribleError() {
        throw "Terrible error";
    }
}

Building it with flags:

--main Main
-D php7
--php build
--debug

Running this build will trace the uncaught exception:

$ php build/index.php
PHP Fatal error:  Uncaught php/_Boot/HxException: Terrible error in build/lib/Main.php:25
Stack trace:
#0 build/lib/Main.php(16): Main::terribleError()
#1 build/index.php(13): Main::main()
#2 {main}
  thrown in build/lib/Main.php on line 25

Install JStack using haxelib install jstack. JStack automatically adds the -D source_map flag, so there is no need to add it manually.

If JStack is installed, it can be added to the compilation process like so:

--main Main
-D php7
--php build
--debug
-L jstack

The output will have a more informative stack trace for exceptions:

$ php build/index.php
Terrible error
Called from Main.terribleError (src/Main.hx line 7)
Called from Main.main (src/Main.hx line 3)
Called from build/index.php line 13

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