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Improved blocking (#513)

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core: major improvements to blocking, including support for buffered channels.
This commit is contained in:
Jaden Weiss
2019-09-22 11:58:00 -04:00
committed by Ron Evans
parent d17f500c8b
commit d843ebfe40
12 changed files with 1069 additions and 486 deletions
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compiler/channel.go
+6 -25
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@@ -4,32 +4,17 @@ package compiler
// or pseudo-operations that are lowered during goroutine lowering.
import (
"fmt"
"go/types"
"golang.org/x/tools/go/ssa"
"tinygo.org/x/go-llvm"
)
// emitMakeChan returns a new channel value for the given channel type.
func (c *Compiler) emitMakeChan(expr *ssa.MakeChan) (llvm.Value, error) {
chanType := c.getLLVMType(expr.Type())
size := c.targetData.TypeAllocSize(chanType.ElementType())
sizeValue := llvm.ConstInt(c.uintptrType, size, false)
ptr := c.createRuntimeCall("alloc", []llvm.Value{sizeValue}, "chan.alloc")
ptr = c.builder.CreateBitCast(ptr, chanType, "chan")
// Set the elementSize field
elementSizePtr := c.builder.CreateGEP(ptr, []llvm.Value{
llvm.ConstInt(c.ctx.Int32Type(), 0, false),
llvm.ConstInt(c.ctx.Int32Type(), 0, false),
}, "")
func (c *Compiler) emitMakeChan(frame *Frame, expr *ssa.MakeChan) llvm.Value {
elementSize := c.targetData.TypeAllocSize(c.getLLVMType(expr.Type().(*types.Chan).Elem()))
if elementSize > 0xffff {
return ptr, c.makeError(expr.Pos(), fmt.Sprintf("element size is %d bytes, which is bigger than the maximum of %d bytes", elementSize, 0xffff))
}
elementSizeValue := llvm.ConstInt(c.ctx.Int16Type(), elementSize, false)
c.builder.CreateStore(elementSizeValue, elementSizePtr)
return ptr, nil
elementSizeValue := llvm.ConstInt(c.uintptrType, elementSize, false)
bufSize := c.getValue(frame, expr.Size)
return c.createRuntimeCall("chanMake", []llvm.Value{elementSizeValue, bufSize}, "")
}
// emitChanSend emits a pseudo chan send operation. It is lowered to the actual
@@ -44,8 +29,7 @@ func (c *Compiler) emitChanSend(frame *Frame, instr *ssa.Send) {
c.builder.CreateStore(chanValue, valueAlloca)
// Do the send.
coroutine := c.createRuntimeCall("getCoroutine", nil, "")
c.createRuntimeCall("chanSend", []llvm.Value{coroutine, ch, valueAllocaCast}, "")
c.createRuntimeCall("chanSend", []llvm.Value{ch, valueAllocaCast}, "")
// End the lifetime of the alloca.
// This also works around a bug in CoroSplit, at least in LLVM 8:
@@ -63,14 +47,11 @@ func (c *Compiler) emitChanRecv(frame *Frame, unop *ssa.UnOp) llvm.Value {
valueAlloca, valueAllocaCast, valueAllocaSize := c.createTemporaryAlloca(valueType, "chan.value")
// Do the receive.
coroutine := c.createRuntimeCall("getCoroutine", nil, "")
c.createRuntimeCall("chanRecv", []llvm.Value{coroutine, ch, valueAllocaCast}, "")
commaOk := c.createRuntimeCall("chanRecv", []llvm.Value{ch, valueAllocaCast}, "")
received := c.builder.CreateLoad(valueAlloca, "chan.received")
c.emitLifetimeEnd(valueAllocaCast, valueAllocaSize)
if unop.CommaOk {
commaOk := c.createRuntimeCall("getTaskStateData", []llvm.Value{coroutine}, "chan.commaOk.wide")
commaOk = c.builder.CreateTrunc(commaOk, c.ctx.Int1Type(), "chan.commaOk")
tuple := llvm.Undef(c.ctx.StructType([]llvm.Type{valueType, c.ctx.Int1Type()}, false))
tuple = c.builder.CreateInsertValue(tuple, received, 0, "")
tuple = c.builder.CreateInsertValue(tuple, commaOk, 1, "")