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Add a Place::is_indirect method to determine whether a Place contains a Deref projection - #64005
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This returns whether a `Place` references the same region of memory as its base, or equivalently whether it contains a `Deref` projection. This is helpful for analyses that must track state for locals, since an assignment to `x` or `x.field` is fundamentally different than one to `*x`, which may mutate any memory region.
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From the changes in this PR it looks to me like all use cases could use the find_local function instead?
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What do you think about changing the true to !place.is_indirect()?
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That works better.
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r? @spastorino this looks like something right up your alley |
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Nice work and looks good to me. I'm not sure I like the name of the function but can't think of a better one right now. Any other ideas?, @oli-obk do you consider the fn name good enough? any better ideas?. |
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@bors r+ Nope, no better ideas here |
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📌 Commit 96ac02b has been approved by |
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Add a `Place::is_indirect` method to determine whether a `Place` contains a `Deref` projection Working on rust-lang#63860 requires tracking some property about each local. This requires differentiating `Place`s like `x` and `x.field[index]` from ones like `*x` and `*x.field`, since the first two will always access the same region of memory as `x` while the latter two may access any region of memory. This functionality is duplicated in various places across the compiler. This PR adds a helper method to `Place` which determines whether that `Place` has a `Deref` projection at any point and changes some existing code to use the new method. I've not converted `qualify_consts.rs` to use the new method, since it's not a trivial conversion and it will get replaced anyway by rust-lang#63860. There may be other potential uses besides the two I change in this PR. r? @oli-obk
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Add a `Place::is_indirect` method to determine whether a `Place` contains a `Deref` projection Working on rust-lang#63860 requires tracking some property about each local. This requires differentiating `Place`s like `x` and `x.field[index]` from ones like `*x` and `*x.field`, since the first two will always access the same region of memory as `x` while the latter two may access any region of memory. This functionality is duplicated in various places across the compiler. This PR adds a helper method to `Place` which determines whether that `Place` has a `Deref` projection at any point and changes some existing code to use the new method. I've not converted `qualify_consts.rs` to use the new method, since it's not a trivial conversion and it will get replaced anyway by rust-lang#63860. There may be other potential uses besides the two I change in this PR. r? @oli-obk
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Rollup of 15 pull requests Successful merges: - #62860 (Stabilize checked_duration_since for 1.38.0) - #63549 (Rev::rposition counts from the wrong end) - #63985 (Stabilize pin_into_inner in 1.39.0) - #64005 (Add a `Place::is_indirect` method to determine whether a `Place` contains a `Deref` projection) - #64031 (Harden `param_attrs` test wrt. usage of a proc macro `#[attr]`) - #64038 (Check impl trait substs when checking for recursive types) - #64043 (Add some more tests for underscore imports) - #64092 (Update xLTO compatibility table in rustc book.) - #64110 (Refer to "`self` type" instead of "receiver type") - #64120 (Move path parsing earlier) - #64123 (Added warning around code with reference to uninit bytes) - #64128 (unused_parens: account for or-patterns and `&(mut x)`) - #64141 (Minimize uses of `LocalInternedString`) - #64142 (Fix doc links in `std::cmp` module) - #64148 (fix a few typos in comments) Failed merges: r? @ghost
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Working on #63860 requires tracking some property about each local. This requires differentiating
Places likexandx.field[index]from ones like*xand*x.field, since the first two will always access the same region of memory asxwhile the latter two may access any region of memory. This functionality is duplicated in various places across the compiler. This PR adds a helper method toPlacewhich determines whether thatPlacehas aDerefprojection at any point and changes some existing code to use the new method.I've not converted
qualify_consts.rsto use the new method, since it's not a trivial conversion and it will get replaced anyway by #63860. There may be other potential uses besides the two I change in this PR.r? @oli-obk