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to reflect the new license. We understand that people may be surprised that we're moving the header entirely to discuss the new license. We checked this carefully with the Foundation's lawyer and we believe this is the correct approach. Essentially, all code in the project is now made available by the LLVM project under our new license, so you will see that the license headers include that license only. Some of our contributors have contributed code under our old license, and accordingly, we have retained a copy of our old license notice in the top-level files in each project and repository. llvm-svn: 351636
106 lines
3.6 KiB
Go
106 lines
3.6 KiB
Go
//===- slice.go - IR generation for slices --------------------------------===//
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//
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// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
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// See https://llvm.org/LICENSE.txt for license information.
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// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
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//
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//===----------------------------------------------------------------------===//
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//
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// This file implements IR generation for slices.
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//
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//===----------------------------------------------------------------------===//
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package irgen
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import (
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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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// makeSlice allocates a new slice with the optional length and capacity,
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// initialising its contents to their zero values.
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func (fr *frame) makeSlice(sliceType types.Type, length, capacity *govalue) *govalue {
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length = fr.convert(length, types.Typ[types.Uintptr])
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capacity = fr.convert(capacity, types.Typ[types.Uintptr])
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runtimeType := fr.types.ToRuntime(sliceType)
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llslice := fr.runtime.makeSlice.call(fr, runtimeType, length.value, capacity.value)
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return newValue(llslice[0], sliceType)
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}
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func (fr *frame) slice(x llvm.Value, xtyp types.Type, low, high, max llvm.Value) llvm.Value {
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if !low.IsNil() {
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low = fr.createZExtOrTrunc(low, fr.types.inttype, "")
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} else {
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low = llvm.ConstNull(fr.types.inttype)
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}
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if !high.IsNil() {
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high = fr.createZExtOrTrunc(high, fr.types.inttype, "")
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}
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if !max.IsNil() {
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max = fr.createZExtOrTrunc(max, fr.types.inttype, "")
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}
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var arrayptr, arraylen, arraycap llvm.Value
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var elemtyp types.Type
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var errcode uint64
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switch typ := xtyp.Underlying().(type) {
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case *types.Pointer: // *array
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errcode = gccgoRuntimeErrorARRAY_SLICE_OUT_OF_BOUNDS
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arraytyp := typ.Elem().Underlying().(*types.Array)
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elemtyp = arraytyp.Elem()
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arrayptr = x
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arrayptr = fr.builder.CreateBitCast(arrayptr, llvm.PointerType(llvm.Int8Type(), 0), "")
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arraylen = llvm.ConstInt(fr.llvmtypes.inttype, uint64(arraytyp.Len()), false)
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arraycap = arraylen
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case *types.Slice:
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errcode = gccgoRuntimeErrorSLICE_SLICE_OUT_OF_BOUNDS
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elemtyp = typ.Elem()
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arrayptr = fr.builder.CreateExtractValue(x, 0, "")
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arraylen = fr.builder.CreateExtractValue(x, 1, "")
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arraycap = fr.builder.CreateExtractValue(x, 2, "")
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case *types.Basic:
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if high.IsNil() {
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high = llvm.ConstAllOnes(fr.types.inttype) // -1
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}
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result := fr.runtime.stringSlice.call(fr, x, low, high)
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return result[0]
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default:
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panic("unimplemented")
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}
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if high.IsNil() {
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high = arraylen
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}
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if max.IsNil() {
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max = arraycap
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}
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// Bounds checking: 0 <= low <= high <= max <= cap
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zero := llvm.ConstNull(fr.types.inttype)
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l0 := fr.builder.CreateICmp(llvm.IntSLT, low, zero, "")
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hl := fr.builder.CreateICmp(llvm.IntSLT, high, low, "")
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mh := fr.builder.CreateICmp(llvm.IntSLT, max, high, "")
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cm := fr.builder.CreateICmp(llvm.IntSLT, arraycap, max, "")
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cond := fr.builder.CreateOr(l0, hl, "")
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cond = fr.builder.CreateOr(cond, mh, "")
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cond = fr.builder.CreateOr(cond, cm, "")
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fr.condBrRuntimeError(cond, errcode)
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slicelen := fr.builder.CreateSub(high, low, "")
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slicecap := fr.builder.CreateSub(max, low, "")
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elemsize := llvm.ConstInt(fr.llvmtypes.inttype, uint64(fr.llvmtypes.Sizeof(elemtyp)), false)
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offset := fr.builder.CreateMul(low, elemsize, "")
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sliceptr := fr.builder.CreateInBoundsGEP(arrayptr, []llvm.Value{offset}, "")
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llslicetyp := fr.llvmtypes.sliceBackendType().ToLLVM(fr.llvmtypes.ctx)
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sliceValue := llvm.Undef(llslicetyp)
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sliceValue = fr.builder.CreateInsertValue(sliceValue, sliceptr, 0, "")
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sliceValue = fr.builder.CreateInsertValue(sliceValue, slicelen, 1, "")
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sliceValue = fr.builder.CreateInsertValue(sliceValue, slicecap, 2, "")
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return sliceValue
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}
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