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1 Commits (8da7b5b4e523c8872dc49144ce17e9a6f5598d19)

Author	SHA1	Message	Date
Alessio Giacobbe	8f8ae77ec8	fix(codegen): PHP semantics for division, modulo, shifts and compound assignment on typed scalars (#45) --skip-tests ... * fix(codegen): route typed division, int modulo and shifts through PHP operators Typed int/int and float-typed division fell through to a raw C++ '/': 7 / 2 on zend_long operands truncated to 3 where PHP returns 3.5, integer division by zero was undefined behavior and float division by zero produced INF, while PHP raises a catchable DivisionByZeroError in both cases; PHP_INT_MIN / -1 also has UB in C++ but promotes to float in PHP. The '%' guard only routed through php::fn::mod when NOT both operands were int, so both-int modulo kept raw C++ '%' (UB for a zero divisor and for PHP_INT_MIN % -1, which PHP defines as 0). Dynamic int shifts were raw C++ too: PHP defines counts >= the word size as 0 (or -1 for negative right shifts) and raises ArithmeticError for negative counts, both undefined in C++. Route all of these through the encapsulated php::Var operators / php::fn::mod in non-native mode, matching the existing +/-/* pattern. Constant folds are untouched; constant shifts that C++ defines identically to PHP still emit raw operators. * fix(parser): defer literal zero divisors to the runtime DivisionByZeroError A literal `/ 0` or `% 0` (including `/=` and `%=`) was a compile-time fatal, rejecting valid PHP: Zend compiles it and raises a catchable DivisionByZeroError only when the statement executes, so dead or guarded code like `if ($cond) { $x = 1 % 0; }` must compile. The equivalent spellings `1 % (1 - 1)` and `10 / ZERO` were already accepted and lowered to the catchable runtime error. Give the literal spelling the same lowering: route the operation through the encapsulated Variant operators (compound assignments on Variant slots already defer via operator/= and operator%=), keep a compile-time warning in normal mode, and keep the fatal in native mode where the C++ operation would be undefined behavior. The six OperatorTest cases asserting the old compile-time fatal now assert the runtime-error lowering instead. * test(operator): platform-neutral literal suffixes, PHP division on typed ints The literal-division assertions hardcoded the macOS zend_long suffix (LL); Linux emits L, so they now match either. native-type.phpt asserted the truncating int division this change removes: division on typed int operands follows PHP semantics in non-native mode, consistent with the pre-existing + - * routing (use native_types keeps raw division), so std::int(10) / 4 is now float(2.5). * fix(codegen): literal zero divisors on native scalar slots raise the runtime error Downgrading the literal-zero compile fatal to a warning exposed the raw C++ compound path on typed native slots: `int $value; $value /= 0` compiled to `value /= php::toInt(0L)` and killed the process with SIGFPE instead of the catchable DivisionByZeroError (`%= 0` likewise; float `/= 0.0` produced INF). A proven zero divisor always throws before any assignment happens, so the whole compound lowers to the PHP-semantics binary operation through php::Var and the target is left untouched. Native-types mode keeps the compile-time rejection. * fix(codegen): exclude explicit native scalars from PHP arithmetic routing std::int()/std::float() opt into native C++ arithmetic independently of the file-wide native_types declaration, and the existing + - * routing already honors that via isExplicitNativeArithmeticExpr(). The new division, both-int modulo and dynamic shift branches, and the literal-zero compound lowering, bypassed it: std::int(10) / 4 changed from int(2) to float(2.5) and native-type.phpt was updated to encode the regression. Every new PHP-semantics branch now skips explicitly native operands, native-type.phpt is restored to int(2), and a proven zero divisor on an explicit native slot keeps the compile-time rejection used by native_types mode instead of being silently rerouted to PHP semantics. Boundary coverage added on both sides: ordinary typed parameters keep PHP behavior (7 / 2 is 3.5, -7 % 2 is -1) while std::int()/std::float() keep native division, modulo and shifts.	1 month ago