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fix: pad 目标长度上界对齐 V8 串长上限

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彭俊皓
2026-09-26 15:55:19 +00:00
parent f97db6094e
commit f900cb919a
1 changed files with 9 additions and 8 deletions
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crates/oxide_builtins/src/string/basic.rs
+9 -8
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@@ -9,6 +9,9 @@ use crate::builtins_error;
use super::common::try_string; use super::common::try_string;
use super::{as_units, find_units, is_trim_unit, map_well_formed_segments, rfind_units, this_units}; use super::{as_units, find_units, is_trim_unit, map_well_formed_segments, rfind_units, this_units};
// 串长上界（V8 kMaxStringLength，node 20.19.2 逐位核）：pad 目标长度越界抛 RangeError。
const MAX_STRING_LENGTH: usize = 536870888;
// ── 静态方法 / 构造 ───────────────────────────────────────────────────── // ── 静态方法 / 构造 ─────────────────────────────────────────────────────
/// `String.fromCharCode(...codes)`：各参数经 ToUint16(ToNumber) 转单元拼接 /// `String.fromCharCode(...codes)`：各参数经 ToUint16(ToNumber) 转单元拼接
@@ -655,8 +658,8 @@ pub fn string_pad_start<H: VmHost>(vm: &mut H, args: &[u8]) -> NativeResult {
// 可观察操作序由规范钉死：receiver ToString 先行，后 targetLength 转换， // 可观察操作序由规范钉死：receiver ToString 先行，后 targetLength 转换，
// 再 padString ToString。 // 再 padString ToString。
let s: Vec<u16> = try_string!(this_units(vm, args)).into_owned(); let s: Vec<u16> = try_string!(this_units(vm, args)).into_owned();
// targetLength：ToIntegerOrInfinity 传播式，负值归 0；+Inf 经既有 10000 // targetLength：ToIntegerOrInfinity 传播式，负值归 0；+Inf 经既有串长
// 上限检查自然落 RangeError。 // 上限（536870888）检查自然落 RangeError。
let target = if args.len() > 1 { let target = if args.len() > 1 {
let p = match to_integer_or_infinity_bounded(vm, vm.reg(args[1])) { let p = match to_integer_or_infinity_bounded(vm, vm.reg(args[1])) {
Ok(p) => p, Ok(p) => p,
@@ -679,8 +682,7 @@ pub fn string_pad_start<H: VmHost>(vm: &mut H, args: &[u8]) -> NativeResult {
if s_len >= target { if s_len >= target {
return NativeResult::Ok(vm.new_string_units_owned(s)); return NativeResult::Ok(vm.new_string_units_owned(s));
} }
if target > 10000 { if target > MAX_STRING_LENGTH {
builtins_error!("String.prototype.padStart: invalid receiver");
return NativeResult::Err(crate::error::create_range_error(vm, "Invalid string length")); return NativeResult::Err(crate::error::create_range_error(vm, "Invalid string length"));
} }
if pad.is_empty() { if pad.is_empty() {
@@ -707,8 +709,8 @@ pub fn string_pad_end<H: VmHost>(vm: &mut H, args: &[u8]) -> NativeResult {
// 可观察操作序由规范钉死：receiver ToString 先行，后 targetLength 转换， // 可观察操作序由规范钉死：receiver ToString 先行，后 targetLength 转换，
// 再 padString ToString。 // 再 padString ToString。
let s: Vec<u16> = try_string!(this_units(vm, args)).into_owned(); let s: Vec<u16> = try_string!(this_units(vm, args)).into_owned();
// targetLength：ToIntegerOrInfinity 传播式，负值归 0；+Inf 经既有 10000 // targetLength：ToIntegerOrInfinity 传播式，负值归 0；+Inf 经既有串长
// 上限检查自然落 RangeError。 // 上限（536870888）检查自然落 RangeError。
let target = if args.len() > 1 { let target = if args.len() > 1 {
let p = match to_integer_or_infinity_bounded(vm, vm.reg(args[1])) { let p = match to_integer_or_infinity_bounded(vm, vm.reg(args[1])) {
Ok(p) => p, Ok(p) => p,
@@ -731,8 +733,7 @@ pub fn string_pad_end<H: VmHost>(vm: &mut H, args: &[u8]) -> NativeResult {
if s_len >= target { if s_len >= target {
return NativeResult::Ok(vm.new_string_units_owned(s)); return NativeResult::Ok(vm.new_string_units_owned(s));
} }
if target > 10000 { if target > MAX_STRING_LENGTH {
builtins_error!("String.prototype.padEnd: invalid receiver");
return NativeResult::Err(crate::error::create_range_error(vm, "Invalid string length")); return NativeResult::Err(crate::error::create_range_error(vm, "Invalid string length"));
} }
if pad.is_empty() { if pad.is_empty() {