compiler

1634 Commits

2 Branches

15 Tags

56 MiB

Tag: Branch: Tree: e4d8cbb798

Commit Graph

Author	SHA1	Message	Date
Lucas Raineri Giandon	a6cd38ae01	fix(optimizer): round() must not lower a RoundingMode enum to an int (#30 ) --skip-tests * fix(optimizer): round() must not lower a RoundingMode enum to an int Since PHP 8.4 the third parameter of round() is a RoundingMode enum, but php::fn::round() models the mode as an Int, which only covers the legacy PHP_ROUND_* constants. genRound sent the argument through convertIntExpr regardless, so the enum went through an object-to-int conversion that yields 1 - PHP_ROUND_HALF_UP: round(2.5, 0, RoundingMode::HalfEven); // compiled: Warning: Object of class RoundingMode could not be // converted to int // compiled: 3 // PHP: 2 Banker's rounding silently became half away from zero. Code that spells out HalfEven is usually money code, where that is the exact difference it was avoiding. A mode that is not statically an int now falls through to the dynamic path, which passes the enum to the runtime function unchanged. The legacy integer constants keep the native call - PHP_ROUND_HALF_DOWN still lowers to a plain 2L - and the one and two argument forms are untouched. Only the compile-time lowering is covered by a test here. A runtime PHPT cannot pass yet: phpx resolves a class constant on an internal class by reading the raw zval out of the constants table, so RoundingMode::HalfEven does not materialise at all. That is reported separately; once it ships, the runtime case can be added to type_conv-style coverage. * fix(optimizer): send every explicit round() mode to the dynamic path Checking only Type::INT was not enough. php::fn::round() calls _php_math_round() directly and never runs Zend's validation of the mode, so an integer outside 1-8 reaches php_round_helper and terminates the process rather than raising ValueError: round(2.5, 0, 99); // segmentation fault A static int type does not prove the runtime value is a valid mode, so an int variable reaches the same path. Since three-argument round() is uncommon, take the conservative option and route every call with an explicit mode to the dynamic Zend path, which validates the argument and accepts both a RoundingMode enum and a legacy PHP_ROUND_* constant. Reject unpacked and named arguments as well: they carry a single Node\Arg whatever their runtime arity is, so genRound() was reading the unpacked array as the number being rounded. Add tests/compiler/stdlib/round-mode.phpt covering valid legacy modes, out-of-range literal and variable modes, and full and partial unpacking. The enum case still cannot produce PHP's result until the swoole/phpx class-constant fix is part of the pinned dependency, so it stays out of the runtime coverage for now. --------- Co-authored-by: Giandonn <lucas_raineri@hotmail.com>	2 days ago
Giandonn	c4ce700868	fix(optimizer): class_exists() must not fold a trait name to true doFoldKnownClass folds class_exists() whenever the name is a literal the symbol table knows. That table also holds traits, so a trait name folded to true while PHP answers false: trait Helper {} class_exists('Helper'); // folded to true $name = 'Helper'; class_exists($name); // reaches php::fn::class_exists, answers false The same program therefore gives two different answers for the same trait, decided only by whether the argument is a literal. The runtime side is already right, and deliberately so: traits are compile-time AST templates in TypePHP, which is why tests/compiler/stdlib/class_exists.phpt expects trait_exists() to be false. Only the constant fold disagreed - with PHP and with the compiler's own runtime. A trait name now folds to false. Classes and enums keep folding to true, which matches PHP: an enum is a class, a trait is not. class_exists.phpt gains the literal and non-literal trait cases, and ClassExistsTraitFoldTest pins the fold decision in the generated C++.	5 days ago

Author

SHA1

Message

Date

Lucas Raineri Giandon

a6cd38ae01

fix(optimizer): round() must not lower a RoundingMode enum to an int (#30 ) --skip-tests

* fix(optimizer): round() must not lower a RoundingMode enum to an int

Since PHP 8.4 the third parameter of round() is a RoundingMode enum, but
php::fn::round() models the mode as an Int, which only covers the legacy
PHP_ROUND_* constants. genRound sent the argument through convertIntExpr
regardless, so the enum went through an object-to-int conversion that
yields 1 - PHP_ROUND_HALF_UP:

    round(2.5, 0, RoundingMode::HalfEven);
    // compiled: Warning: Object of class RoundingMode could not be
    //           converted to int
    // compiled: 3
    // PHP:      2

Banker's rounding silently became half away from zero. Code that spells
out HalfEven is usually money code, where that is the exact difference it
was avoiding.

A mode that is not statically an int now falls through to the dynamic
path, which passes the enum to the runtime function unchanged. The legacy
integer constants keep the native call - PHP_ROUND_HALF_DOWN still lowers
to a plain 2L - and the one and two argument forms are untouched.

Only the compile-time lowering is covered by a test here. A runtime PHPT
cannot pass yet: phpx resolves a class constant on an internal class by
reading the raw zval out of the constants table, so RoundingMode::HalfEven
does not materialise at all. That is reported separately; once it ships,
the runtime case can be added to type_conv-style coverage.

* fix(optimizer): send every explicit round() mode to the dynamic path

Checking only Type::INT was not enough. php::fn::round() calls
_php_math_round() directly and never runs Zend's validation of the mode,
so an integer outside 1-8 reaches php_round_helper and terminates the
process rather than raising ValueError:

    round(2.5, 0, 99);   // segmentation fault

A static int type does not prove the runtime value is a valid mode, so
an int variable reaches the same path. Since three-argument round() is
uncommon, take the conservative option and route every call with an
explicit mode to the dynamic Zend path, which validates the argument and
accepts both a RoundingMode enum and a legacy PHP_ROUND_* constant.

Reject unpacked and named arguments as well: they carry a single
Node\Arg whatever their runtime arity is, so genRound() was reading the
unpacked array as the number being rounded.

Add tests/compiler/stdlib/round-mode.phpt covering valid legacy modes,
out-of-range literal and variable modes, and full and partial unpacking.
The enum case still cannot produce PHP's result until the swoole/phpx
class-constant fix is part of the pinned dependency, so it stays out of
the runtime coverage for now.

---------

Co-authored-by: Giandonn <lucas_raineri@hotmail.com>

2 days ago

Giandonn

c4ce700868

fix(optimizer): class_exists() must not fold a trait name to true

doFoldKnownClass folds class_exists() whenever the name is a literal the
symbol table knows. That table also holds traits, so a trait name folded
to true while PHP answers false:

    trait Helper {}

    class_exists('Helper');   // folded to true
    $name = 'Helper';
    class_exists($name);      // reaches php::fn::class_exists, answers false

The same program therefore gives two different answers for the same
trait, decided only by whether the argument is a literal.

The runtime side is already right, and deliberately so: traits are
compile-time AST templates in TypePHP, which is why
tests/compiler/stdlib/class_exists.phpt expects trait_exists() to be
false. Only the constant fold disagreed - with PHP and with the
compiler's own runtime.

A trait name now folds to false. Classes and enums keep folding to true,
which matches PHP: an enum is a class, a trait is not.

class_exists.phpt gains the literal and non-literal trait cases, and
ClassExistsTraitFoldTest pins the fold decision in the generated C++.

5 days ago

1 Commits (e4d8cbb798f270a8477ac406ca634e12842bbf3a)