Free memory before calling linker#66707
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bors merged 11 commits intorust-lang:masterfrom Nov 30, 2019
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The job Click to expand the log.I'm a bot! I can only do what humans tell me to, so if this was not helpful or you have suggestions for improvements, please ping or otherwise contact |
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☔ The latest upstream changes (presumably #66647) made this pull request unmergeable. Please resolve the merge conflicts. |
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Zoxc
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Nov 25, 2019
Zoxc
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Nov 25, 2019
Zoxc
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Nov 25, 2019
Zoxc
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Nov 25, 2019
Zoxc
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Nov 25, 2019
src/librustc_interface/queries.rs
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| // complex example. | ||
| pub fn enter<'c, F, T>(&'c self, f: F) -> Result<T> | ||
| where F: for<'q> FnOnce(&'q Queries<'c>) -> Result<T> | ||
| where F: FnOnce(Queries<'c>) -> Result<T> |
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This closure should take &Queries<'_>. We don't want to give out ownership. The 'c lifetime also isn't needed here. The comment above is also for the wrong function.
Contributor
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The goal here is to allow for moving the This PR effectively mirrors #59904 where |
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I haven't read through the code changes, but I think we're also scheduled to discuss this soon? (rust-lang/compiler-team#175) I guess maybe that's a much broader issue? |
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@Mark-Simulacrum Yeah, that meeting is about moving the |
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Generally speaking it's a bit unclear to me -- is this primarily trying to move the Arena into Queries, or is it primarily trying to drop things earlier (i.e., before linking)? The PR title suggests the latter, but your summary comment talks more about the first being the driving force. Can you clarify that perhaps? If this is an optimization (i.e., we're not currently dropping things before linking) then that seems fine (though surprising); we can probably land this if the implementation makes sense to you. If this is about moving the Arena into Queries for other reasons then I might want to look into it a bit more but am largely on board too. |
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@Mark-Simulacrum It's prerequisite work for moving the |
Zoxc
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Nov 26, 2019
Zoxc
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Nov 26, 2019
src/librustc_driver/lib.rs
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| // Drop GlobalCtxt after starting codegen to free memory | ||
| mem::drop(compiler.global_ctxt()?.take()); | ||
| // Drop GlobalCtxt after starting codegen to free memory | ||
| mem::drop(queries.global_ctxt()?.take()); |
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This can now be removed since it's freed below when we return from the closure anyway.
Zoxc
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Nov 26, 2019
src/librustc_interface/queries.rs
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| // Drop GlobalCtxt after starting codegen to free memory. | ||
| mem::drop(self.global_ctxt()?.take()); | ||
| // Drop GlobalCtxt after starting codegen to free memory. | ||
| mem::drop(queries.global_ctxt()?.take()); |
Zoxc
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Nov 26, 2019
src/librustdoc/core.rs
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| }; | ||
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| interface::run_compiler_in_existing_thread_pool(config, |compiler| { | ||
| interface::run_compiler_in_existing_thread_pool(config, |compiler| { compiler.enter(|queries| { |
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You can drop the first { here.
Zoxc
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Nov 26, 2019
src/librustc_interface/queries.rs
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| impl Compiler { | ||
| pub fn enter<F, T>(&self, f: F) -> T | ||
| where F: for<'q> FnOnce(&'q Queries<'_>) -> T |
Contributor
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You can write this as F: FnOnce(&Queries<'_>) -> T.
Zoxc
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Nov 26, 2019
src/librustdoc/test.rs
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| let tests = interface::run_compiler(config, |compiler| -> Result<_, ErrorReported> { | ||
| let lower_to_hir = compiler.lower_to_hir()?; | ||
| let tests = interface::run_compiler(config, |compiler| { compiler.enter(|queries| { |
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You can drop the first { here too.
Zoxc
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Nov 26, 2019
Contributor
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This looks good to me with the latest nits fixed. I'm not sure I should approve these changes though since I basically dictated what @cjgillot should do. So I'll just let Mark sign off on the changes. |
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Nov 29, 2019
Handle GlobalCtxt directly from librustc_interface query system This PR constructs the `GlobalCtxt` as a member of the `Queries` in librustc_interface. This simplifies the code to construct it, at the expense of added complexity in the query control flow. This allows to handle the arenas directly from librustc_interface. Based on rust-lang#66707 r? @Zoxc
RalfJung
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Nov 29, 2019
Handle GlobalCtxt directly from librustc_interface query system This PR constructs the `GlobalCtxt` as a member of the `Queries` in librustc_interface. This simplifies the code to construct it, at the expense of added complexity in the query control flow. This allows to handle the arenas directly from librustc_interface. Based on rust-lang#66707 r? @Zoxc
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☔ The latest upstream changes (presumably #66879) made this pull request unmergeable. Please resolve the merge conflicts. |
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The queries in rustc_interfaces are isolated in the
Queriestype. TheQueriesobject constructed to have the smallest possible lifetime, and to drop contents as soon as possible. The information needed by the link phase is extracted through aLinkerobject for later use.r? @Zoxc