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[sil] Add a move_value instruction.

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This is a new instruction that can be used by SILGen to perform a semantic move
in between two entities that are considered separate variables at the AST
level. I am going to use it to implement an experimental borrow checker.

This PR contains the following:

1. I define move_value, setup parsing, printing, serializing, deserializing,
   cloning, and filled in all of the visitors as appropriate.
2. I added createMoveValue and emitMoveValueOperation SILBuilder
   APIs. createMoveValue always creates a move and asserts is passed a trivial
   type. emitMoveValueOperation in contrast, will short circuit if passed a
   trivial value and just return the trivial value.
3. I added IRGen tests to show that we can push this through the entire system.

This is all just scaffolding for the instruction to live in SIL land and as of
this PR doesn't actually do anything.
This commit is contained in:
Michael Gottesman
2021-09-09 15:23:34 -07:00
parent 03e32c4f66
commit 5590c7b526
20 changed files with 155 additions and 2 deletions
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2
lib/Serialization/ModuleFormat.h
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@@ -56,7 +56,7 @@ const uint16_t SWIFTMODULE_VERSION_MAJOR = 0;
/// describe what change you made. The content of this comment isn't important;
/// it just ensures a conflict if two people change the module format.
/// Don't worry about adhering to the 80-column limit for this line.
const uint16_t SWIFTMODULE_VERSION_MINOR = 626; // switch & checkcast ownership
const uint16_t SWIFTMODULE_VERSION_MINOR = 627; // move_value inst
/// A standard hash seed used for all string hashes in a serialized module.
///