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package compiler
import (
"tinygo.org/x/go-llvm"
)
// createAtomicOp lowers a sync/atomic function by lowering it as an LLVM atomic
// operation. It returns the result of the operation, or a zero llvm.Value if
// the result is void.
func (b *builder) createAtomicOp(name string) llvm.Value {
switch name {
case "AddInt32", "AddInt64", "AddUint32", "AddUint64", "AddUintptr":
ptr := b.getValue(b.fn.Params[0], getPos(b.fn))
val := b.getValue(b.fn.Params[1], getPos(b.fn))
oldVal := b.CreateAtomicRMW(llvm.AtomicRMWBinOpAdd, ptr, val, llvm.AtomicOrderingSequentiallyConsistent, true)
// Return the new value, not the original value returned by atomicrmw.
return b.CreateAdd(oldVal, val, "")
case "AndInt32", "AndInt64", "AndUint32", "AndUint64", "AndUintptr":
ptr := b.getValue(b.fn.Params[0], getPos(b.fn))
val := b.getValue(b.fn.Params[1], getPos(b.fn))
oldVal := b.CreateAtomicRMW(llvm.AtomicRMWBinOpAnd, ptr, val, llvm.AtomicOrderingSequentiallyConsistent, true)
return oldVal
case "OrInt32", "OrInt64", "OrUint32", "OrUint64", "OrUintptr":
ptr := b.getValue(b.fn.Params[0], getPos(b.fn))
val := b.getValue(b.fn.Params[1], getPos(b.fn))
oldVal := b.CreateAtomicRMW(llvm.AtomicRMWBinOpOr, ptr, val, llvm.AtomicOrderingSequentiallyConsistent, true)
return oldVal
case "SwapInt32", "SwapInt64", "SwapUint32", "SwapUint64", "SwapUintptr", "SwapPointer":
ptr := b.getValue(b.fn.Params[0], getPos(b.fn))
val := b.getValue(b.fn.Params[1], getPos(b.fn))
oldVal := b.CreateAtomicRMW(llvm.AtomicRMWBinOpXchg, ptr, val, llvm.AtomicOrderingSequentiallyConsistent, true)
return oldVal
case "CompareAndSwapInt32", "CompareAndSwapInt64", "CompareAndSwapUint32", "CompareAndSwapUint64", "CompareAndSwapUintptr", "CompareAndSwapPointer":
ptr := b.getValue(b.fn.Params[0], getPos(b.fn))
old := b.getValue(b.fn.Params[1], getPos(b.fn))
newVal := b.getValue(b.fn.Params[2], getPos(b.fn))
tuple := b.CreateAtomicCmpXchg(ptr, old, newVal, llvm.AtomicOrderingSequentiallyConsistent, llvm.AtomicOrderingSequentiallyConsistent, true)
swapped := b.CreateExtractValue(tuple, 1, "")
return swapped
case "LoadInt32", "LoadInt64", "LoadUint32", "LoadUint64", "LoadUintptr", "LoadPointer":
ptr := b.getValue(b.fn.Params[0], getPos(b.fn))
val := b.CreateLoad(b.getLLVMType(b.fn.Signature.Results().At(0).Type()), ptr, "")
val.SetOrdering(llvm.AtomicOrderingSequentiallyConsistent)
val.SetAlignment(b.targetData.PrefTypeAlignment(val.Type())) // required
return val
case "StoreInt32", "StoreInt64", "StoreUint32", "StoreUint64", "StoreUintptr", "StorePointer":
ptr := b.getValue(b.fn.Params[0], getPos(b.fn))
val := b.getValue(b.fn.Params[1], getPos(b.fn))
store := b.CreateStore(val, ptr)
store.SetOrdering(llvm.AtomicOrderingSequentiallyConsistent)
store.SetAlignment(b.targetData.PrefTypeAlignment(val.Type())) // required
return llvm.Value{}
default:
b.addError(b.fn.Pos(), "unknown atomic operation: "+b.fn.Name())
return llvm.Value{}
}
}
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