llvm-mirror/swiftasync.ll at 3a88dc8338922e0286910a01694c348db8b8f876 - llvm-mirror - Git.je (Gitea)

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Tim Northover 5661b7eb80 IR+AArch64: add a "swiftasync" argument attribute.

This extends any frame record created in the function to include that
parameter, passed in X22.

The new record looks like [X22, FP, LR] in memory, and FP is stored with 0b0001
in bits 63:60 (CodeGen assumes they are 0b0000 in normal operation). The effect
of this is that tools walking the stack should expect to see one of three
values there:

  * 0b0000 => a normal, non-extended record with just [FP, LR]
  * 0b0001 => the extended record [X22, FP, LR]
  * 0b1111 => kernel space, and a non-extended record.

All other values are currently reserved.

If compiling for arm64e this context pointer is address-discriminated with the
discriminator 0xc31a and the DB (process-specific) key.

There is also an "i8** @llvm.swift.async.context.addr()" intrinsic providing
front-ends access to this slot (and forcing its creation initialized to nullptr
if necessary).

2021-05-14 11:43:58 +01:00

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 ; RUN: not llvm-as %s -o /dev/null 2>&1 | FileCheck %s
 declare void @a(i32* swiftasync %a, i32* swiftasync %b)
 ; CHECK: Cannot have multiple 'swiftasync' parameters!