Andrew Kelley f0deef1d79 Sema: fix analyzeBlockBody logic ...

Previously, when a coercion needed to be inserted into a break
instruction, the `br` AIR instruction would be rewritten so that the
block operand was a sub-block that did the coercion. The problem is that
the sub-block itself was never added to the parent block, resulting in
the `br` instruction operand being a bad reference.

Now, the `br` AIR instruction that needs to have coercion instructions
added is replaced with the sub-block itself with type `noreturn`, and
then the sub-block has the coercion instructions and a new `br`
instruction that breaks from the original block.

LLVM backend needed to be fixed to lower `noreturn` blocks without
emitting an unused LLVM basic block.

2021-11-26 23:17:01 -07:00

3.5 KiB

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