294 lines
8.8 KiB
Go
294 lines
8.8 KiB
Go
/*
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* Copyright (c) 2024 The GoPlus Authors (goplus.org). All rights reserved.
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*
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* Licensed under the Apache License, Version 2.0 (the "License");
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* you may not use this file except in compliance with the License.
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* You may obtain a copy of the License at
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*
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* http://www.apache.org/licenses/LICENSE-2.0
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*
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* Unless required by applicable law or agreed to in writing, software
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* distributed under the License is distributed on an "AS IS" BASIS,
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* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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* See the License for the specific language governing permissions and
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* limitations under the License.
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*/
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package ssa
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import (
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"go/token"
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"go/types"
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"log"
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"github.com/goplus/llgo/ssa/abi"
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"github.com/goplus/llvm"
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)
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// -----------------------------------------------------------------------------
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// unsafeEface(t *abi.Type, data unsafe.Pointer) Eface
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func (b Builder) unsafeEface(t, data llvm.Value) llvm.Value {
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return aggregateValue(b.impl, b.Prog.rtEface(), t, data)
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}
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// unsafeIface(itab *runtime.Itab, data unsafe.Pointer) Eface
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func (b Builder) unsafeIface(itab, data llvm.Value) llvm.Value {
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return aggregateValue(b.impl, b.Prog.rtIface(), itab, data)
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}
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// func NewItab(tintf *InterfaceType, typ *Type) *runtime.Itab
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func (b Builder) newItab(tintf, typ Expr) Expr {
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return b.Call(b.Pkg.rtFunc("NewItab"), tintf, typ)
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}
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func (b Builder) unsafeInterface(rawIntf *types.Interface, t Expr, data llvm.Value) llvm.Value {
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if rawIntf.Empty() {
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return b.unsafeEface(t.impl, data)
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}
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tintf := b.abiType(rawIntf)
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itab := b.newItab(tintf, t)
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return b.unsafeIface(itab.impl, data)
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}
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func iMethodOf(rawIntf *types.Interface, name string) int {
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n := rawIntf.NumMethods()
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for i := 0; i < n; i++ {
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m := rawIntf.Method(i)
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if m.Name() == name {
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// TODO(xsw): check signature
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return i
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}
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}
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return -1
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}
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// Imethod returns closure of an interface method.
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func (b Builder) Imethod(intf Expr, method *types.Func) Expr {
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prog := b.Prog
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rawIntf := intf.raw.Type.Underlying().(*types.Interface)
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tclosure := prog.Type(method.Type(), InGo)
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i := iMethodOf(rawIntf, method.Name())
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impl := intf.impl
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itab := Expr{b.faceItab(impl), prog.VoidPtrPtr()}
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pfn := b.Advance(itab, prog.IntVal(uint64(i+3), prog.Int()))
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fn := b.Load(pfn)
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ret := b.aggregateValue(tclosure, fn.impl, b.faceData(impl))
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return ret
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}
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// -----------------------------------------------------------------------------
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// MakeInterface constructs an instance of an interface type from a
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// value of a concrete type.
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//
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// Use Program.MethodSets.MethodSet(X.Type()) to find the method-set
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// of X, and Program.MethodValue(m) to find the implementation of a method.
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//
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// To construct the zero value of an interface type T, use:
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//
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// NewConst(constant.MakeNil(), T, pos)
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//
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// Example printed form:
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//
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// t1 = make interface{} <- int (42:int)
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// t2 = make Stringer <- t0
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func (b Builder) MakeInterface(tinter Type, x Expr) (ret Expr) {
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rawIntf := tinter.raw.Type.Underlying().(*types.Interface)
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if debugInstr {
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log.Printf("MakeInterface %v, %v\n", rawIntf, x.impl)
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}
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prog := b.Prog
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typ := x.Type
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tabi := b.abiType(typ.raw.Type)
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kind, _, lvl := abi.DataKindOf(typ.raw.Type, 0, prog.is32Bits)
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switch kind {
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case abi.Indirect:
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vptr := b.AllocU(typ)
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b.Store(vptr, x)
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return Expr{b.unsafeInterface(rawIntf, tabi, vptr.impl), tinter}
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}
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ximpl := x.impl
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if lvl > 0 {
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ximpl = extractVal(b.impl, ximpl, lvl)
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}
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var u llvm.Value
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switch kind {
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case abi.Pointer:
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return Expr{b.unsafeInterface(rawIntf, tabi, ximpl), tinter}
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case abi.Integer:
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tu := prog.Uintptr()
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u = llvm.CreateIntCast(b.impl, ximpl, tu.ll)
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case abi.BitCast:
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tu := prog.Uintptr()
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u = llvm.CreateBitCast(b.impl, ximpl, tu.ll)
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default:
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panic("todo")
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}
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data := llvm.CreateIntToPtr(b.impl, u, prog.tyVoidPtr())
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return Expr{b.unsafeInterface(rawIntf, tabi, data), tinter}
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}
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func (b Builder) valFromData(typ Type, data llvm.Value) Expr {
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prog := b.Prog
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kind, real, lvl := abi.DataKindOf(typ.raw.Type, 0, prog.is32Bits)
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switch kind {
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case abi.Indirect:
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impl := b.impl
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tll := typ.ll
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tptr := llvm.PointerType(tll, 0)
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ptr := llvm.CreatePointerCast(impl, data, tptr)
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return Expr{llvm.CreateLoad(impl, tll, ptr), typ}
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}
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t := typ
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if lvl > 0 {
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t = prog.rawType(real)
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}
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switch kind {
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case abi.Pointer:
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return b.buildVal(typ, data, lvl)
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case abi.Integer:
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x := castUintptr(b, data, prog.Uintptr())
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return b.buildVal(typ, castInt(b, x, t), lvl)
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case abi.BitCast:
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x := castUintptr(b, data, prog.Uintptr())
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if int(prog.SizeOf(t)) != prog.PointerSize() {
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x = castInt(b, x, prog.Int32())
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}
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return b.buildVal(typ, llvm.CreateBitCast(b.impl, x, t.ll), lvl)
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}
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panic("todo")
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}
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func extractVal(b llvm.Builder, val llvm.Value, lvl int) llvm.Value {
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for lvl > 0 {
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// TODO(xsw): check array support
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val = llvm.CreateExtractValue(b, val, 0)
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lvl--
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}
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return val
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}
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func (b Builder) buildVal(typ Type, val llvm.Value, lvl int) Expr {
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if lvl == 0 {
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return Expr{val, typ}
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}
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switch t := typ.raw.Type.Underlying().(type) {
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case *types.Struct:
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telem := b.Prog.rawType(t.Field(0).Type())
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elem := b.buildVal(telem, val, lvl-1)
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return Expr{aggregateValue(b.impl, typ.ll, elem.impl), typ}
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}
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panic("todo")
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}
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// The TypeAssert instruction tests whether interface value X has type
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// AssertedType.
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//
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// If !CommaOk, on success it returns v, the result of the conversion
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// (defined below); on failure it panics.
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//
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// If CommaOk: on success it returns a pair (v, true) where v is the
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// result of the conversion; on failure it returns (z, false) where z
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// is AssertedType's zero value. The components of the pair must be
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// accessed using the Extract instruction.
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//
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// If Underlying: tests whether interface value X has the underlying
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// type AssertedType.
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//
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// If AssertedType is a concrete type, TypeAssert checks whether the
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// dynamic type in interface X is equal to it, and if so, the result
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// of the conversion is a copy of the value in the interface.
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//
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// If AssertedType is an interface, TypeAssert checks whether the
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// dynamic type of the interface is assignable to it, and if so, the
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// result of the conversion is a copy of the interface value X.
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// If AssertedType is a superinterface of X.Type(), the operation will
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// fail iff the operand is nil. (Contrast with ChangeInterface, which
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// performs no nil-check.)
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//
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// Type() reflects the actual type of the result, possibly a
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// 2-types.Tuple; AssertedType is the asserted type.
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//
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// Depending on the TypeAssert's purpose, Pos may return:
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// - the ast.CallExpr.Lparen of an explicit T(e) conversion;
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// - the ast.TypeAssertExpr.Lparen of an explicit e.(T) operation;
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// - the ast.CaseClause.Case of a case of a type-switch statement;
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// - the Ident(m).NamePos of an interface method value i.m
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// (for which TypeAssert may be used to effect the nil check).
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//
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// Example printed form:
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//
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// t1 = typeassert t0.(int)
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// t3 = typeassert,ok t2.(T)
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func (b Builder) TypeAssert(x Expr, assertedTyp Type, commaOk bool) Expr {
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if debugInstr {
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log.Printf("TypeAssert %v, %v, %v\n", x.impl, assertedTyp.raw.Type, commaOk)
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}
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tx := b.faceAbiType(x)
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tabi := b.abiType(assertedTyp.raw.Type)
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eq := b.BinOp(token.EQL, tx, tabi)
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if commaOk {
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prog := b.Prog
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t := prog.Struct(assertedTyp, prog.Bool())
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blks := b.Func.MakeBlocks(3)
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b.If(eq, blks[0], blks[1])
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b.SetBlockEx(blks[2], AtEnd, false)
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phi := b.Phi(t)
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phi.AddIncoming(b, blks[:2], func(i int, blk BasicBlock) Expr {
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b.SetBlockEx(blk, AtEnd, false)
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if i == 0 {
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val := b.valFromData(assertedTyp, b.faceData(x.impl))
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valTrue := aggregateValue(b.impl, t.ll, val.impl, prog.BoolVal(true).impl)
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b.Jump(blks[2])
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return Expr{valTrue, t}
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}
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zero := prog.Zero(assertedTyp)
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valFalse := aggregateValue(b.impl, t.ll, zero.impl, prog.BoolVal(false).impl)
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b.Jump(blks[2])
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return Expr{valFalse, t}
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})
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b.SetBlockEx(blks[2], AtEnd, false)
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b.blk.last = blks[2].last
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return phi.Expr
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}
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blks := b.Func.MakeBlocks(2)
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b.If(eq, blks[0], blks[1])
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b.SetBlockEx(blks[1], AtEnd, false)
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b.Panic(b.Str("type assertion failed"))
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b.SetBlockEx(blks[0], AtEnd, false)
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b.blk.last = blks[0].last
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return b.valFromData(assertedTyp, b.faceData(x.impl))
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}
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// -----------------------------------------------------------------------------
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/*
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// InterfaceData returns the data pointer of an interface.
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func (b Builder) InterfaceData(x Expr) Expr {
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if debugInstr {
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log.Printf("InterfaceData %v\n", x.impl)
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}
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return Expr{b.faceData(x.impl), b.Prog.VoidPtr()}
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}
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*/
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func (b Builder) faceData(x llvm.Value) llvm.Value {
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return llvm.CreateExtractValue(b.impl, x, 1)
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}
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func (b Builder) faceItab(x llvm.Value) llvm.Value {
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return llvm.CreateExtractValue(b.impl, x, 0)
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}
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func (b Builder) faceAbiType(x Expr) Expr {
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if x.kind == vkIface {
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panic("todo")
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}
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typ := llvm.CreateExtractValue(b.impl, x.impl, 0)
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return Expr{typ, b.Prog.AbiTypePtr()}
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}
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// -----------------------------------------------------------------------------
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