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Miri engine cleanup#53671

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RalfJung:miri-refactorRalfJung/rust:miri-refactorCopy head branch name to clipboard

Aug 29, 2018

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Commits on Aug 27, 2018

• Miri Memory Work

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• without all those copies of constants, we can finally make eval_operand take &self

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• allow Machine to hook into foreign statics; remove unused HasMemory trait

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• simplify const_to_allocation_provider because it is used for statics only

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• Clean up function calling

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• terminator/drop.rs is just one fn... merge it together with the other terminator stuff

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• switch validation to use operand, not mplace

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• move const_eval out of rustc_mir::interpret

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• get rid of FinishStatic hack from stack clenaup; const_eval can do that itself

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• dedicated handling for binops on bool and char (UB if they are not valid)

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• validate enum discriminant whenever it is read

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• fix handling of unsized types in validation; validate str to be UTF-8

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• expand comment on how statics work

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• fix len() on non-array but array-layout types (e.g. SIMD)

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• get rid of *most* of the fn call hack by honoring mir.spread_arg

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• use associated const for machine controlling mutable statics

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Commits on Aug 28, 2018

• address nits

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• fix unsized extern types

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• restructure unary_op to also dispatch on type first; fix promotion with unary '-' overflowing

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• fix const_prop detecting unary neg underflows

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• first test const-ness, then hook fn call

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