diff options
author | Brian Smith <brian@dbsoft.org> | 2023-07-19 17:10:33 -0500 |
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committer | Brian Smith <brian@dbsoft.org> | 2023-07-19 17:10:33 -0500 |
commit | 24e4a09270cd7194c09e6370cf308a4350ae5e37 (patch) | |
tree | d35d3fdc84ea7bd8f3cfcf03ee18c29d6646949d /js/src/vm/Interpreter-inl.h | |
parent | f193a4a7dce742005883f67ec4260637d41661aa (diff) | |
download | uxp-24e4a09270cd7194c09e6370cf308a4350ae5e37.tar.gz |
Issue #1240 - Part 5g - Implement BigInt comparison operators.
Implement BigInt support for equality operators.
https://bugzilla.mozilla.org/show_bug.cgi?id=1486173 Part 3.
Implement BigInt support for relational comparison operators.
https://bugzilla.mozilla.org/show_bug.cgi?id=1492669
Diffstat (limited to 'js/src/vm/Interpreter-inl.h')
-rw-r--r-- | js/src/vm/Interpreter-inl.h | 177 |
1 files changed, 143 insertions, 34 deletions
diff --git a/js/src/vm/Interpreter-inl.h b/js/src/vm/Interpreter-inl.h index ecdb619868..a48c753f1d 100644 --- a/js/src/vm/Interpreter-inl.h +++ b/js/src/vm/Interpreter-inl.h @@ -8,6 +8,8 @@ #include "vm/Interpreter.h" +#include "mozilla/Maybe.h" + #include "jscompartment.h" #include "jsnum.h" #include "jsstr.h" @@ -660,51 +662,158 @@ ProcessCallSiteObjOperation(JSContext* cx, RootedObject& cso, RootedObject& raw, return true; } -#define RELATIONAL_OP(OP) \ - JS_BEGIN_MACRO \ - /* Optimize for two int-tagged operands (typical loop control). */ \ - if (lhs.isInt32() && rhs.isInt32()) { \ - *res = lhs.toInt32() OP rhs.toInt32(); \ - } else { \ - if (!ToPrimitive(cx, JSTYPE_NUMBER, lhs)) \ - return false; \ - if (!ToPrimitive(cx, JSTYPE_NUMBER, rhs)) \ - return false; \ - if (lhs.isString() && rhs.isString()) { \ - JSString* l = lhs.toString(); \ - JSString* r = rhs.toString(); \ - int32_t result; \ - if (!CompareStrings(cx, l, r, &result)) \ - return false; \ - *res = result OP 0; \ - } else { \ - double l, r; \ - if (!ToNumber(cx, lhs, &l) || !ToNumber(cx, rhs, &r)) \ - return false; \ - *res = (l OP r); \ - } \ - } \ - return true; \ - JS_END_MACRO +// BigInt proposal 3.2.4 Abstract Relational Comparison +// Returns Nothing when at least one operand is a NaN, or when +// ToNumeric or StringToBigInt can't interpret a string as a numeric +// value. (These cases correspond to a NaN result in the spec.) +// Otherwise, return a boolean to indicate whether lhs is less than +// rhs. The operands must be primitives; the caller is responsible for +// evaluating them in the correct order. +static MOZ_ALWAYS_INLINE bool +LessThanImpl(JSContext* cx, MutableHandleValue lhs, MutableHandleValue rhs, + mozilla::Maybe<bool>& res) +{ + // Steps 1 and 2 are performed by the caller. + + // Step 3. + if (lhs.isString() && rhs.isString()) { + JSString* l = lhs.toString(); + JSString* r = rhs.toString(); + int32_t result; + if (!CompareStrings(cx, l, r, &result)) { + return false; + } + res = mozilla::Some(result < 0); + return true; + } + + // Step 4a. + if (lhs.isBigInt() && rhs.isString()) { + return BigInt::lessThan(cx, lhs, rhs, res); + } + // Step 4b. + if (lhs.isString() && rhs.isBigInt()) { + return BigInt::lessThan(cx, lhs, rhs, res); + } + + // Steps 4c and 4d. + if (!ToNumeric(cx, lhs) || !ToNumeric(cx, rhs)) { + return false; + } + + // Steps 4e-j. + if (lhs.isBigInt() || rhs.isBigInt()) { + return BigInt::lessThan(cx, lhs, rhs, res); + } + + // Step 4e for Number operands. + MOZ_ASSERT(lhs.isNumber() && rhs.isNumber()); + double lhsNum = lhs.toNumber(); + double rhsNum = rhs.toNumber(); + + if (mozilla::IsNaN(lhsNum) || mozilla::IsNaN(rhsNum)) { + res = mozilla::Maybe<bool>(mozilla::Nothing()); + return true; + } + + res = mozilla::Some(lhsNum < rhsNum); + return true; +} static MOZ_ALWAYS_INLINE bool -LessThanOperation(JSContext* cx, MutableHandleValue lhs, MutableHandleValue rhs, bool* res) { - RELATIONAL_OP(<); +LessThanOperation(JSContext* cx, MutableHandleValue lhs, MutableHandleValue rhs, bool* res) +{ + if (lhs.isInt32() && rhs.isInt32()) { + *res = lhs.toInt32() < rhs.toInt32(); + return true; + } + + if (!ToPrimitive(cx, JSTYPE_NUMBER, lhs)) { + return false; + } + + if (!ToPrimitive(cx, JSTYPE_NUMBER, rhs)) { + return false; + } + + mozilla::Maybe<bool> tmpResult; + if (!LessThanImpl(cx, lhs, rhs, tmpResult)) { + return false; + } + *res = tmpResult.valueOr(false); + return true; } static MOZ_ALWAYS_INLINE bool -LessThanOrEqualOperation(JSContext* cx, MutableHandleValue lhs, MutableHandleValue rhs, bool* res) { - RELATIONAL_OP(<=); +LessThanOrEqualOperation(JSContext* cx, MutableHandleValue lhs, MutableHandleValue rhs, bool* res) +{ + if (lhs.isInt32() && rhs.isInt32()) { + *res = lhs.toInt32() <= rhs.toInt32(); + return true; + } + + if (!ToPrimitive(cx, JSTYPE_NUMBER, lhs)) { + return false; + } + + if (!ToPrimitive(cx, JSTYPE_NUMBER, rhs)) { + return false; + } + + mozilla::Maybe<bool> tmpResult; + if (!LessThanImpl(cx, rhs, lhs, tmpResult)) { + return false; + } + *res = !tmpResult.valueOr(true); + return true; } static MOZ_ALWAYS_INLINE bool -GreaterThanOperation(JSContext* cx, MutableHandleValue lhs, MutableHandleValue rhs, bool* res) { - RELATIONAL_OP(>); +GreaterThanOperation(JSContext* cx, MutableHandleValue lhs, MutableHandleValue rhs, bool* res) +{ + if (lhs.isInt32() && rhs.isInt32()) { + *res = lhs.toInt32() > rhs.toInt32(); + return true; + } + + if (!ToPrimitive(cx, JSTYPE_NUMBER, lhs)) { + return false; + } + + if (!ToPrimitive(cx, JSTYPE_NUMBER, rhs)) { + return false; + } + + mozilla::Maybe<bool> tmpResult; + if (!LessThanImpl(cx, rhs, lhs, tmpResult)) { + return false; + } + *res = tmpResult.valueOr(false); + return true; } static MOZ_ALWAYS_INLINE bool -GreaterThanOrEqualOperation(JSContext* cx, MutableHandleValue lhs, MutableHandleValue rhs, bool* res) { - RELATIONAL_OP(>=); +GreaterThanOrEqualOperation(JSContext* cx, MutableHandleValue lhs, MutableHandleValue rhs, bool* res) +{ + if (lhs.isInt32() && rhs.isInt32()) { + *res = lhs.toInt32() >= rhs.toInt32(); + return true; + } + + if (!ToPrimitive(cx, JSTYPE_NUMBER, lhs)) { + return false; + } + + if (!ToPrimitive(cx, JSTYPE_NUMBER, rhs)) { + return false; + } + + mozilla::Maybe<bool> tmpResult; + if (!LessThanImpl(cx, lhs, rhs, tmpResult)) { + return false; + } + *res = !tmpResult.valueOr(true); + return true; } static MOZ_ALWAYS_INLINE bool |