Define byte-cursor output aliasing with cursor state
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还没有人认领这个 Issue。
评估
调研方向
Start with std/bytes/read.wave:40, then locate the read and peek cursor-output variants and their tests. Before implementation, get the required design discussion with @LunaStev to decide whether cursor outputs may alias position, length, or backing storage. Done means the approved rule is documented for all alias cases, existing success and rollback behavior remains intact, and read/peek variants apply the same rule without per-width duplication.
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描述
Motivation
Passing &reader.position as the u64 output of a valid eight-byte read returns success and leaves position=28 for len=8 when the decoded value is 20. O0/O2 agree. The API does not state whether output may overlap cursor state, and cannot simultaneously preserve two meanings for the same bytes.
Starting point: std/bytes/read.wave:40.
Validation
Audited canonical Wave 540728c2eb6cc12f5c69c3fb3fdb96e07ba059a4 (0.0.1-alpha-dev), whose tree matches the local checkout. Validation: Executed valid-memory output/state alias fixture at native O0/O2. Executed compiler probes use the matching checkout-built compiler and std on Linux amd64 (Rust 1.89.0 / LLVM 21.1.8). Source/header or mocked checks are not native execution on another OS.
Scope
Choose explicit non-aliasing or checked-overlap rules for cursor outputs/state/backing storage. Do not promise arbitrary alias support or call this a Rust memory-safety defect.
Related: #674, #763. These links do not claim those broader or completed scopes are unfinished.
Design discussion required
This issue records a proposal or an unresolved contract; it is not approval to choose new semantics. Please mention @LunaStev to discuss the design before starting implementation.
Completion criteria
- The position/len/data alias cases have documented permitted or rejected behavior.
- Normal outputs and failure rollback keep their existing results.
- Read and peek variants apply the same approved rule without duplicating one cause per integer width.
- 主要语言
- Rust
- 星标
- 56
- 派生
- 21
- 平均合并
- 23 小时 20 分钟
- 30 天内合并 PR
- 45
环境准备
从这里开始
- 先读完整个 Issue，再读项目的贡献指南。
- 在 Issue 下留言说明你要接手 —— 这能避免两个人做同样的事。
- Fork 仓库，在一个分支上完成修改。
- 提交 Pull Request，并在描述里引用这个 Issue 编号。
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