118 lines
4.2 KiB
Go
118 lines
4.2 KiB
Go
//===- builtins.go - IR generation for builtins ---------------------------===//
|
|
//
|
|
// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
|
|
// See https://llvm.org/LICENSE.txt for license information.
|
|
// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
|
|
//
|
|
//===----------------------------------------------------------------------===//
|
|
//
|
|
// This file implements IR generation for the built-in functions.
|
|
//
|
|
//===----------------------------------------------------------------------===//
|
|
|
|
package irgen
|
|
|
|
import (
|
|
"llvm.org/llgo/third_party/gotools/go/types"
|
|
"llvm.org/llvm/bindings/go/llvm"
|
|
)
|
|
|
|
func (fr *frame) callCap(arg *govalue) *govalue {
|
|
var v llvm.Value
|
|
switch typ := arg.Type().Underlying().(type) {
|
|
case *types.Array:
|
|
v = llvm.ConstInt(fr.llvmtypes.inttype, uint64(typ.Len()), false)
|
|
case *types.Pointer:
|
|
atyp := typ.Elem().Underlying().(*types.Array)
|
|
v = llvm.ConstInt(fr.llvmtypes.inttype, uint64(atyp.Len()), false)
|
|
case *types.Slice:
|
|
v = fr.builder.CreateExtractValue(arg.value, 2, "")
|
|
case *types.Chan:
|
|
v = fr.runtime.chanCap.call(fr, arg.value)[0]
|
|
}
|
|
return newValue(v, types.Typ[types.Int])
|
|
}
|
|
|
|
func (fr *frame) callLen(arg *govalue) *govalue {
|
|
var lenvalue llvm.Value
|
|
switch typ := arg.Type().Underlying().(type) {
|
|
case *types.Array:
|
|
lenvalue = llvm.ConstInt(fr.llvmtypes.inttype, uint64(typ.Len()), false)
|
|
case *types.Pointer:
|
|
atyp := typ.Elem().Underlying().(*types.Array)
|
|
lenvalue = llvm.ConstInt(fr.llvmtypes.inttype, uint64(atyp.Len()), false)
|
|
case *types.Slice:
|
|
lenvalue = fr.builder.CreateExtractValue(arg.value, 1, "")
|
|
case *types.Map:
|
|
lenvalue = fr.runtime.mapLen.call(fr, arg.value)[0]
|
|
case *types.Basic:
|
|
if isString(typ) {
|
|
lenvalue = fr.builder.CreateExtractValue(arg.value, 1, "")
|
|
}
|
|
case *types.Chan:
|
|
lenvalue = fr.runtime.chanLen.call(fr, arg.value)[0]
|
|
}
|
|
return newValue(lenvalue, types.Typ[types.Int])
|
|
}
|
|
|
|
// callAppend takes two slices of the same type, and yields
|
|
// the result of appending the second to the first.
|
|
func (fr *frame) callAppend(a, b *govalue) *govalue {
|
|
bptr := fr.builder.CreateExtractValue(b.value, 0, "")
|
|
blen := fr.builder.CreateExtractValue(b.value, 1, "")
|
|
elemsizeInt64 := fr.types.Sizeof(a.Type().Underlying().(*types.Slice).Elem())
|
|
elemsize := llvm.ConstInt(fr.target.IntPtrType(), uint64(elemsizeInt64), false)
|
|
result := fr.runtime.append.call(fr, a.value, bptr, blen, elemsize)[0]
|
|
return newValue(result, a.Type())
|
|
}
|
|
|
|
// callCopy takes two slices a and b of the same type, and
|
|
// yields the result of calling "copy(a, b)".
|
|
func (fr *frame) callCopy(dest, source *govalue) *govalue {
|
|
aptr := fr.builder.CreateExtractValue(dest.value, 0, "")
|
|
alen := fr.builder.CreateExtractValue(dest.value, 1, "")
|
|
bptr := fr.builder.CreateExtractValue(source.value, 0, "")
|
|
blen := fr.builder.CreateExtractValue(source.value, 1, "")
|
|
aless := fr.builder.CreateICmp(llvm.IntULT, alen, blen, "")
|
|
minlen := fr.builder.CreateSelect(aless, alen, blen, "")
|
|
elemsizeInt64 := fr.types.Sizeof(dest.Type().Underlying().(*types.Slice).Elem())
|
|
elemsize := llvm.ConstInt(fr.types.inttype, uint64(elemsizeInt64), false)
|
|
bytes := fr.builder.CreateMul(minlen, elemsize, "")
|
|
fr.runtime.copy.call(fr, aptr, bptr, bytes)
|
|
return newValue(minlen, types.Typ[types.Int])
|
|
}
|
|
|
|
func (fr *frame) callRecover(isDeferredRecover bool) *govalue {
|
|
startbb := fr.builder.GetInsertBlock()
|
|
recoverbb := llvm.AddBasicBlock(fr.function, "")
|
|
contbb := llvm.AddBasicBlock(fr.function, "")
|
|
canRecover := fr.builder.CreateTrunc(fr.canRecover, llvm.Int1Type(), "")
|
|
fr.builder.CreateCondBr(canRecover, recoverbb, contbb)
|
|
|
|
fr.builder.SetInsertPointAtEnd(recoverbb)
|
|
var recovered llvm.Value
|
|
if isDeferredRecover {
|
|
recovered = fr.runtime.deferredRecover.call(fr)[0]
|
|
} else {
|
|
recovered = fr.runtime.recover.call(fr)[0]
|
|
}
|
|
recoverbb = fr.builder.GetInsertBlock()
|
|
fr.builder.CreateBr(contbb)
|
|
|
|
fr.builder.SetInsertPointAtEnd(contbb)
|
|
eface := types.NewInterface(nil, nil)
|
|
llv := fr.builder.CreatePHI(fr.types.ToLLVM(eface), "")
|
|
llv.AddIncoming(
|
|
[]llvm.Value{llvm.ConstNull(llv.Type()), recovered},
|
|
[]llvm.BasicBlock{startbb, recoverbb},
|
|
)
|
|
return newValue(llv, eface)
|
|
}
|
|
|
|
func (fr *frame) callPanic(arg *govalue, term bool) {
|
|
fr.runtime.panic.call(fr, arg.value)
|
|
if term {
|
|
fr.builder.CreateUnreachable()
|
|
}
|
|
}
|