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//===- maps.go - IR generation for maps -----------------------------------===//
//
// 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 maps.
//
//===----------------------------------------------------------------------===//
package irgen
import (
"llvm.org/llgo/third_party/gotools/go/types"
"llvm.org/llvm/bindings/go/llvm"
)
// makeMap implements make(maptype[, initial space])
func (fr *frame) makeMap(typ types.Type, cap_ *govalue) *govalue {
// TODO(pcc): call __go_new_map_big here if needed
dyntyp := fr.types.getMapDescriptorPointer(typ)
dyntyp = fr.builder.CreateBitCast(dyntyp, llvm.PointerType(llvm.Int8Type(), 0), "")
var cap llvm.Value
if cap_ != nil {
cap = fr.convert(cap_, types.Typ[types.Uintptr]).value
} else {
cap = llvm.ConstNull(fr.types.inttype)
}
m := fr.runtime.newMap.call(fr, dyntyp, cap)
return newValue(m[0], typ)
}
// mapLookup implements v[, ok] = m[k]
func (fr *frame) mapLookup(m, k *govalue) (v *govalue, ok *govalue) {
llk := k.value
pk := fr.allocaBuilder.CreateAlloca(llk.Type(), "")
fr.builder.CreateStore(llk, pk)
valptr := fr.runtime.mapIndex.call(fr, m.value, pk, boolLLVMValue(false))[0]
attrkind := llvm.AttributeKindID("nocapture")
valptr.AddCallSiteAttribute(2, fr.types.ctx.CreateEnumAttribute(attrkind, 0))
attrkind = llvm.AttributeKindID("readonly")
valptr.AddCallSiteAttribute(2, fr.types.ctx.CreateEnumAttribute(attrkind, 0))
okbit := fr.builder.CreateIsNotNull(valptr, "")
elemtyp := m.Type().Underlying().(*types.Map).Elem()
ok = newValue(fr.builder.CreateZExt(okbit, llvm.Int8Type(), ""), types.Typ[types.Bool])
v = fr.loadOrNull(okbit, valptr, elemtyp)
return
}
// mapUpdate implements m[k] = v
func (fr *frame) mapUpdate(m, k, v *govalue) {
llk := k.value
pk := fr.allocaBuilder.CreateAlloca(llk.Type(), "")
fr.builder.CreateStore(llk, pk)
valptr := fr.runtime.mapIndex.call(fr, m.value, pk, boolLLVMValue(true))[0]
attrkind := llvm.AttributeKindID("nocapture")
valptr.AddCallSiteAttribute(2, fr.types.ctx.CreateEnumAttribute(attrkind, 0))
attrkind = llvm.AttributeKindID("readonly")
valptr.AddCallSiteAttribute(2, fr.types.ctx.CreateEnumAttribute(attrkind, 0))
elemtyp := m.Type().Underlying().(*types.Map).Elem()
llelemtyp := fr.types.ToLLVM(elemtyp)
typedvalptr := fr.builder.CreateBitCast(valptr, llvm.PointerType(llelemtyp, 0), "")
fr.builder.CreateStore(v.value, typedvalptr)
}
// mapDelete implements delete(m, k)
func (fr *frame) mapDelete(m, k *govalue) {
llk := k.value
pk := fr.allocaBuilder.CreateAlloca(llk.Type(), "")
fr.builder.CreateStore(llk, pk)
fr.runtime.mapdelete.call(fr, m.value, pk)
}
// mapIterInit creates a map iterator
func (fr *frame) mapIterInit(m *govalue) []*govalue {
// We represent an iterator as a tuple (map, *bool). The second element
// controls whether the code we generate for "next" (below) calls the
// runtime function for the first or the next element. We let the
// optimizer reorganize this into something more sensible.
isinit := fr.allocaBuilder.CreateAlloca(llvm.Int1Type(), "")
fr.builder.CreateStore(llvm.ConstNull(llvm.Int1Type()), isinit)
return []*govalue{m, newValue(isinit, types.NewPointer(types.Typ[types.Bool]))}
}
// mapIterNext advances the iterator, and returns the tuple (ok, k, v).
func (fr *frame) mapIterNext(iter []*govalue) []*govalue {
maptyp := iter[0].Type().Underlying().(*types.Map)
ktyp := maptyp.Key()
klltyp := fr.types.ToLLVM(ktyp)
vtyp := maptyp.Elem()
vlltyp := fr.types.ToLLVM(vtyp)
m, isinitptr := iter[0], iter[1]
i8ptr := llvm.PointerType(llvm.Int8Type(), 0)
mapiterbufty := llvm.ArrayType(i8ptr, 4)
mapiterbuf := fr.allocaBuilder.CreateAlloca(mapiterbufty, "")
mapiterbufelem0ptr := fr.builder.CreateStructGEP(mapiterbuf, 0, "")
keybuf := fr.allocaBuilder.CreateAlloca(klltyp, "")
keyptr := fr.builder.CreateBitCast(keybuf, i8ptr, "")
valbuf := fr.allocaBuilder.CreateAlloca(vlltyp, "")
valptr := fr.builder.CreateBitCast(valbuf, i8ptr, "")
isinit := fr.builder.CreateLoad(isinitptr.value, "")
initbb := llvm.AddBasicBlock(fr.function, "")
nextbb := llvm.AddBasicBlock(fr.function, "")
contbb := llvm.AddBasicBlock(fr.function, "")
fr.builder.CreateCondBr(isinit, nextbb, initbb)
fr.builder.SetInsertPointAtEnd(initbb)
fr.builder.CreateStore(llvm.ConstAllOnes(llvm.Int1Type()), isinitptr.value)
fr.runtime.mapiterinit.call(fr, m.value, mapiterbufelem0ptr)
fr.builder.CreateBr(contbb)
fr.builder.SetInsertPointAtEnd(nextbb)
fr.runtime.mapiternext.call(fr, mapiterbufelem0ptr)
fr.builder.CreateBr(contbb)
fr.builder.SetInsertPointAtEnd(contbb)
mapiterbufelem0 := fr.builder.CreateLoad(mapiterbufelem0ptr, "")
okbit := fr.builder.CreateIsNotNull(mapiterbufelem0, "")
ok := fr.builder.CreateZExt(okbit, llvm.Int8Type(), "")
loadbb := llvm.AddBasicBlock(fr.function, "")
cont2bb := llvm.AddBasicBlock(fr.function, "")
fr.builder.CreateCondBr(okbit, loadbb, cont2bb)
fr.builder.SetInsertPointAtEnd(loadbb)
fr.runtime.mapiter2.call(fr, mapiterbufelem0ptr, keyptr, valptr)
loadbb = fr.builder.GetInsertBlock()
loadedkey := fr.builder.CreateLoad(keybuf, "")
loadedval := fr.builder.CreateLoad(valbuf, "")
fr.builder.CreateBr(cont2bb)
fr.builder.SetInsertPointAtEnd(cont2bb)
k := fr.builder.CreatePHI(klltyp, "")
k.AddIncoming(
[]llvm.Value{llvm.ConstNull(klltyp), loadedkey},
[]llvm.BasicBlock{contbb, loadbb},
)
v := fr.builder.CreatePHI(vlltyp, "")
v.AddIncoming(
[]llvm.Value{llvm.ConstNull(vlltyp), loadedval},
[]llvm.BasicBlock{contbb, loadbb},
)
return []*govalue{newValue(ok, types.Typ[types.Bool]), newValue(k, ktyp), newValue(v, vtyp)}
}
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