115 lines
3.6 KiB
Go
115 lines
3.6 KiB
Go
//===- strings.go - IR generation for string ops --------------------------===//
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//
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// The LLVM Compiler Infrastructure
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//
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// This file is distributed under the University of Illinois Open Source
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// License. See LICENSE.TXT for details.
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//
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//===----------------------------------------------------------------------===//
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//
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// This file implements IR generation for string operations.
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//
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//===----------------------------------------------------------------------===//
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package irgen
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import (
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"go/token"
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"llvm.org/llgo/third_party/gotools/go/types"
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"llvm.org/llvm/bindings/go/llvm"
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)
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func (fr *frame) concatenateStrings(lhs, rhs *govalue) *govalue {
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result := fr.runtime.stringPlus.call(fr, lhs.value, rhs.value)
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return newValue(result[0], types.Typ[types.String])
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}
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func (fr *frame) compareStringEmpty(v llvm.Value) *govalue {
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len := fr.builder.CreateExtractValue(v, 1, "")
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result := fr.builder.CreateIsNull(len, "")
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result = fr.builder.CreateZExt(result, llvm.Int8Type(), "")
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return newValue(result, types.Typ[types.Bool])
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}
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func (fr *frame) compareStrings(lhs, rhs *govalue, op token.Token) *govalue {
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if op == token.EQL {
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if lhs.value.IsNull() {
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return fr.compareStringEmpty(rhs.value)
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}
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if rhs.value.IsNull() {
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return fr.compareStringEmpty(lhs.value)
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}
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}
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result := fr.runtime.strcmp.call(fr, lhs.value, rhs.value)[0]
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zero := llvm.ConstNull(fr.types.inttype)
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var pred llvm.IntPredicate
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switch op {
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case token.EQL:
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pred = llvm.IntEQ
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case token.LSS:
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pred = llvm.IntSLT
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case token.GTR:
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pred = llvm.IntSGT
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case token.LEQ:
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pred = llvm.IntSLE
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case token.GEQ:
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pred = llvm.IntSGE
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case token.NEQ:
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panic("NEQ is handled in govalue.BinaryOp")
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default:
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panic("unreachable")
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}
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result = fr.builder.CreateICmp(pred, result, zero, "")
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result = fr.builder.CreateZExt(result, llvm.Int8Type(), "")
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return newValue(result, types.Typ[types.Bool])
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}
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// stringIndex implements v = m[i]
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func (fr *frame) stringIndex(s, i *govalue) *govalue {
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ptr := fr.builder.CreateExtractValue(s.value, 0, "")
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ptr = fr.builder.CreateGEP(ptr, []llvm.Value{i.value}, "")
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return newValue(fr.builder.CreateLoad(ptr, ""), types.Typ[types.Byte])
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}
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func (fr *frame) stringIterInit(str *govalue) []*govalue {
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indexptr := fr.allocaBuilder.CreateAlloca(fr.types.inttype, "")
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fr.builder.CreateStore(llvm.ConstNull(fr.types.inttype), indexptr)
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return []*govalue{str, newValue(indexptr, types.Typ[types.Int])}
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}
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// stringIterNext advances the iterator, and returns the tuple (ok, k, v).
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func (fr *frame) stringIterNext(iter []*govalue) []*govalue {
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str, indexptr := iter[0], iter[1]
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k := fr.builder.CreateLoad(indexptr.value, "")
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result := fr.runtime.stringiter2.call(fr, str.value, k)
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fr.builder.CreateStore(result[0], indexptr.value)
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ok := fr.builder.CreateIsNotNull(result[0], "")
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ok = fr.builder.CreateZExt(ok, llvm.Int8Type(), "")
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v := result[1]
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return []*govalue{newValue(ok, types.Typ[types.Bool]), newValue(k, types.Typ[types.Int]), newValue(v, types.Typ[types.Rune])}
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}
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func (fr *frame) runeToString(v *govalue) *govalue {
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v = fr.convert(v, types.Typ[types.Int])
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result := fr.runtime.intToString.call(fr, v.value)
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return newValue(result[0], types.Typ[types.String])
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}
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func (fr *frame) stringToRuneSlice(v *govalue) *govalue {
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result := fr.runtime.stringToIntArray.call(fr, v.value)
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runeslice := types.NewSlice(types.Typ[types.Rune])
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return newValue(result[0], runeslice)
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}
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func (fr *frame) runeSliceToString(v *govalue) *govalue {
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llv := v.value
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ptr := fr.builder.CreateExtractValue(llv, 0, "")
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len := fr.builder.CreateExtractValue(llv, 1, "")
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result := fr.runtime.intArrayToString.call(fr, ptr, len)
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return newValue(result[0], types.Typ[types.String])
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}
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