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Convert upcalls to core Rust functions #2861
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A-codegenArea: Code generationArea: Code generationA-runtimeArea: std's runtime and "pre-main" init for handling backtraces, unwinds, stack overflowsArea: std's runtime and "pre-main" init for handling backtraces, unwinds, stack overflowsC-enhancementCategory: An issue proposing an enhancement or a PR with one.Category: An issue proposing an enhancement or a PR with one.
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A-codegenArea: Code generationArea: Code generationA-runtimeArea: std's runtime and "pre-main" init for handling backtraces, unwinds, stack overflowsArea: std's runtime and "pre-main" init for handling backtraces, unwinds, stack overflowsC-enhancementCategory: An issue proposing an enhancement or a PR with one.Category: An issue proposing an enhancement or a PR with one.
The main motivation is that the new failure code is written in Rust so calling it directly makes more sense than indirecting through native runtime code.
This also lets us to have fewer stack-switching mechanisms as upcalls are dealt with differently than other foreign functions.