Hood ChathamandPaulo Matos
765f0d14fe
Originally #71540 by Paolo Matos, I picked it up and finished it. Resolves https://github.com/llvm/llvm-project/issues/69894. Model WebAssembly externref and funcref as target("wasm.externref") / target("wasm.funcref") TargetExtTypes instead of pointers in non-integral address spaces 10 and 20. The entire WebAssemblyLowerRefTypesIntPtrConv can be removed. This breaks the GlobalISel handling for reference types, I just disabled GlobalISel handling for functions that use them. I added intrinsics for `wasm.ptr.to_funcref` and `wasm.funcref.to_ptr`. ptr.to_funcref does a table.get from the indirect function pointer table. As a special case, 0 is converted to the null funcref rather than doing table.get on 0. `wasm.funcref.to_ptr` is only handled when we call it immediately, otherwise it will fail to lower. We could dynamically put the funcref into the table to make it work but that would require a stack of spilled funcrefs and isn't worth the effort. In the process of looking into this, I noticed that clang used to allow casting from funcref to function pointer but if the cast result escaped it would hit `Cannot select: FUNCREF_TO_PTR` in the backend. I added a diagnostic that says "a funcref can only be converted to a pointer to be directly called" to make this a little cleaner. cc @QuantumSegfault --------- Co-authored-by: Paulo Matos <pmatos@igalia.com>
65 lines
2.2 KiB
LLVM
65 lines
2.2 KiB
LLVM
; NOTE: Assertions have been autogenerated by utils/update_llc_test_checks.py
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; RUN: llc --mtriple=wasm32-unknown-unknown -mattr=+reference-types < %s | FileCheck %s
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%externref = type target("wasm.externref")
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%funcref = type target("wasm.funcref")
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declare %externref @llvm.wasm.ref.null.extern() nounwind
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declare %funcref @llvm.wasm.ref.null.func() nounwind
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declare i32 @llvm.wasm.ref.is_null.extern(%externref) nounwind
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declare i32 @llvm.wasm.ref.is_null.func(%funcref) nounwind
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define %externref @get_null_extern() {
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; CHECK-LABEL: get_null_extern:
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; CHECK: .functype get_null_extern () -> (externref)
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; CHECK-NEXT: # %bb.0:
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; CHECK-NEXT: ref.null_extern
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; CHECK-NEXT: # fallthrough-return
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%null = call %externref @llvm.wasm.ref.null.extern()
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ret %externref %null
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}
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define %funcref @get_null_func() {
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; CHECK-LABEL: get_null_func:
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; CHECK: .functype get_null_func () -> (funcref)
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; CHECK-NEXT: # %bb.0:
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; CHECK-NEXT: ref.null_func
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; CHECK-NEXT: # fallthrough-return
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%null = call %funcref @llvm.wasm.ref.null.func()
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ret %funcref %null
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}
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define i32 @ref_is_null_extern(%externref %eref) {
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; CHECK-LABEL: ref_is_null_extern:
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; CHECK: .functype ref_is_null_extern (externref) -> (i32)
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; CHECK-NEXT: # %bb.0:
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; CHECK-NEXT: ref.null_extern
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; CHECK-NEXT: ref.is_null
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; CHECK-NEXT: local.get 0
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; CHECK-NEXT: ref.is_null
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; CHECK-NEXT: i32.add
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; CHECK-NEXT: # fallthrough-return
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%null = call %externref @llvm.wasm.ref.null.extern()
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%is_null = call i32 @llvm.wasm.ref.is_null.extern(%externref %null)
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%arg_is_null = call i32 @llvm.wasm.ref.is_null.extern(%externref %eref)
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%res = add i32 %is_null, %arg_is_null
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ret i32 %res
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}
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define i32 @ref_is_null_func(%funcref %fref) {
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; CHECK-LABEL: ref_is_null_func:
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; CHECK: .functype ref_is_null_func (funcref) -> (i32)
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; CHECK-NEXT: # %bb.0:
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; CHECK-NEXT: ref.null_func
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; CHECK-NEXT: ref.is_null
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; CHECK-NEXT: local.get 0
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; CHECK-NEXT: ref.is_null
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; CHECK-NEXT: i32.add
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; CHECK-NEXT: # fallthrough-return
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%null = call %funcref @llvm.wasm.ref.null.func()
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%is_null = call i32 @llvm.wasm.ref.is_null.func(%funcref %null)
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%arg_is_null = call i32 @llvm.wasm.ref.is_null.func(%funcref %fref)
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%res = add i32 %is_null, %arg_is_null
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ret i32 %res
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}
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