82 lines
2.0 KiB
Go
82 lines
2.0 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 runtime
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import (
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"unsafe"
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"github.com/goplus/llgo/c"
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)
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// -----------------------------------------------------------------------------
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// Slice is the runtime representation of a slice.
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type Slice struct {
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data unsafe.Pointer
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len int
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cap int
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}
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func NewSlice3(base unsafe.Pointer, eltSize, cap, i, j, k int) (s Slice) {
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if i < 0 || j < i || k < j || k > cap {
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panic("slice index out of bounds")
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}
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s.len = j - i
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s.cap = k - i
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if k-i > 0 {
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s.data = c.Advance(base, i*eltSize)
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} else {
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s.data = base
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}
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return
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}
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// SliceAppend append elem data and returns a slice.
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func SliceAppend(src Slice, data unsafe.Pointer, num, etSize int) Slice {
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if etSize == 0 {
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return src
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}
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oldLen := src.len
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newLen := src.len + num
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if newLen > src.cap {
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newCap := nextslicecap(newLen, src.cap)
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p := AllocZ(uintptr(newCap * etSize))
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if oldLen != 0 {
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c.Memcpy(p, src.data, uintptr(oldLen*etSize))
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}
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src.data = p
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src.cap = newCap
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}
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src.len = newLen
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c.Memcpy(c.Advance(src.data, oldLen*etSize), data, uintptr(num*etSize))
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return src
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}
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// SliceCopy copy data to slice and returns a slice.
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func SliceCopy(dst Slice, data unsafe.Pointer, num int, etSize int) int {
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n := dst.len
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if n > num {
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n = num
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}
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if n > 0 {
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c.Memmove(dst.data, data, uintptr(n*etSize))
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}
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return n
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}
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// -----------------------------------------------------------------------------
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