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Add extend to imports #283

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MarkMcCaskey
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resolves #258 (early draft)

@MarkMcCaskey MarkMcCaskey added 🎉 enhancement New feature! 📦 lib-deprecated About the deprecated crates 📦 lib-runtime labels Mar 19, 2019
@@ -41,7 +41,13 @@ impl IsExport for Export {
/// }
/// ```
pub struct ImportObject {
map: Rc<RefCell<HashMap<String, Box<dyn LikeNamespace>>>>,
map: Rc<RefCell<HashMap<(String, String), Box<dyn IsExport>>>>,
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Main issue with this is that we need to keep imported instances alive. I'm not sure the best way to do this, however.

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Hmm, I'm not familiar enough with the code base yet to understand how this change affects the lifetimes of the Exports. It seems like it should be the same, unless you mean that we were dropping entries by namespace before 🤔

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Yeah, the Box<dyn LikeNamespace> could contain an Instance. When getting a function pointer from an ImportObject, if the Instance isn't maintained in the ImportObject, the function pointer will dangle.

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Hmm, it's possible to use two maps and check both to emulate a global name lookup.

Though, I'm still a bit unclear on the ownership... ImportObjects own Instances and Instances own ImportObjects?

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Closing this in favor of #286

bors bot added a commit that referenced this pull request Mar 25, 2019
286: Add extend to imports  r=MarkMcCaskey a=MarkMcCaskey

a rewrite of #283 with a focus on simplicity

resolves #258

Co-authored-by: Mark McCaskey <mark@wasmer.io>
@MarkMcCaskey MarkMcCaskey deleted the feature/add-extend-to-imports branch April 25, 2019 23:23
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Ability to combine two import objects
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