tinygo-org/tinygo
1
0
Fork 0
mirror of https://github.com/tinygo-org/tinygo.git synced 2026-08-15 08:23:41 +00:00
Code Issues Packages Projects Releases 6 Wiki Activity

transform: remove switched func lowering

Browse Source 
The switched func lowering was mainly necessary for coroutines.
With coroutines removed, this is no longer necessary.
This commit is contained in:
Nia Waldvogel
2021-12-31 13:51:47 -05:00
committed by Nia
parent ea2a6b70b2
commit 0c2fefa09b
14 changed files with 57 additions and 617 deletions
Download Patch File Download Diff File Expand all files Collapse all files
compiler/func.go
+9 -54
View File
@@ -19,29 +19,8 @@ func (b *builder) createFuncValue(funcPtr, context llvm.Value, sig *types.Signat
// createFuncValue creates a function value from a raw function pointer with no
// context.
func (c *compilerContext) createFuncValue(builder llvm.Builder, funcPtr, context llvm.Value, sig *types.Signature) llvm.Value {
var funcValueScalar llvm.Value
switch c.FuncImplementation {
case "doubleword":
// Closure is: {context, function pointer}
funcValueScalar = llvm.ConstBitCast(funcPtr, c.rawVoidFuncType)
case "switch":
funcValueWithSignatureGlobalName := funcPtr.Name() + "$withSignature"
funcValueWithSignatureGlobal := c.mod.NamedGlobal(funcValueWithSignatureGlobalName)
if funcValueWithSignatureGlobal.IsNil() {
funcValueWithSignatureType := c.getLLVMRuntimeType("funcValueWithSignature")
funcValueWithSignature := llvm.ConstNamedStruct(funcValueWithSignatureType, []llvm.Value{
llvm.ConstPtrToInt(funcPtr, c.uintptrType),
c.getFuncSignatureID(sig),
})
funcValueWithSignatureGlobal = llvm.AddGlobal(c.mod, funcValueWithSignatureType, funcValueWithSignatureGlobalName)
funcValueWithSignatureGlobal.SetInitializer(funcValueWithSignature)
funcValueWithSignatureGlobal.SetGlobalConstant(true)
funcValueWithSignatureGlobal.SetLinkage(llvm.LinkOnceODRLinkage)
}
funcValueScalar = llvm.ConstPtrToInt(funcValueWithSignatureGlobal, c.uintptrType)
default:
panic("unimplemented func value variant")
}
// Closure is: {context, function pointer}
funcValueScalar := llvm.ConstBitCast(funcPtr, c.rawVoidFuncType)
funcValueType := c.getFuncType(sig)
funcValue := llvm.Undef(funcValueType)
funcValue = builder.CreateInsertValue(funcValue, context, 0, "")
@@ -78,43 +57,19 @@ func (b *builder) extractFuncContext(funcValue llvm.Value) llvm.Value {
// value. This may be an expensive operation.
func (b *builder) decodeFuncValue(funcValue llvm.Value, sig *types.Signature) (funcPtr, context llvm.Value) {
context = b.CreateExtractValue(funcValue, 0, "")
switch b.FuncImplementation {
case "doubleword":
bitcast := b.CreateExtractValue(funcValue, 1, "")
if !bitcast.IsAConstantExpr().IsNil() && bitcast.Opcode() == llvm.BitCast {
funcPtr = bitcast.Operand(0)
return
}
llvmSig := b.getRawFuncType(sig)
funcPtr = b.CreateBitCast(bitcast, llvmSig, "")
case "switch":
if !funcValue.IsAConstant().IsNil() {
// If this is a constant func value, the underlying function is
// known and can be returned directly.
funcValueWithSignatureGlobal := llvm.ConstExtractValue(funcValue, []uint32{1}).Operand(0)
funcPtr = llvm.ConstExtractValue(funcValueWithSignatureGlobal.Initializer(), []uint32{0}).Operand(0)
return
}
llvmSig := b.getRawFuncType(sig)
sigGlobal := b.getFuncSignatureID(sig)
funcPtr = b.createRuntimeCall("getFuncPtr", []llvm.Value{funcValue, sigGlobal}, "")
funcPtr = b.CreateIntToPtr(funcPtr, llvmSig, "")
default:
panic("unimplemented func value variant")
bitcast := b.CreateExtractValue(funcValue, 1, "")
if !bitcast.IsAConstantExpr().IsNil() && bitcast.Opcode() == llvm.BitCast {
funcPtr = bitcast.Operand(0)
return
}
llvmSig := b.getRawFuncType(sig)
funcPtr = b.CreateBitCast(bitcast, llvmSig, "")
return
}
// getFuncType returns the type of a func value given a signature.
func (c *compilerContext) getFuncType(typ *types.Signature) llvm.Type {
switch c.FuncImplementation {
case "doubleword":
return c.ctx.StructType([]llvm.Type{c.i8ptrType, c.rawVoidFuncType}, false)
case "switch":
return c.getLLVMRuntimeType("funcValue")
default:
panic("unimplemented func value variant")
}
return c.ctx.StructType([]llvm.Type{c.i8ptrType, c.rawVoidFuncType}, false)
}
// getRawFuncType returns a LLVM function pointer type for a given signature.