0704794def
This commit adds object layout information to new heap allocations. It is not yet used anywhere: the next commit will make use of it. Object layout information will eventually be used for a (mostly) precise garbage collector. This is what the data is made for. However, it is also useful in the interp package which can work better if it knows the memory layout and thus the approximate LLVM type of heap-allocated objects.
72 строки
1,2 КиБ
Go
72 строки
1,2 КиБ
Go
package main
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var (
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scalar1 *byte
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scalar2 *int32
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scalar3 *int64
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scalar4 *float32
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array1 *[3]byte
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array2 *[71]byte
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array3 *[3]*byte
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struct1 *struct{}
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struct2 *struct {
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x int
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y int
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}
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struct3 *struct {
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x *byte
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y [60]uintptr
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z *byte
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}
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slice1 []byte
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slice2 []*int
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slice3 [][]byte
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)
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func newScalar() {
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scalar1 = new(byte)
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scalar2 = new(int32)
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scalar3 = new(int64)
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scalar4 = new(float32)
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}
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func newArray() {
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array1 = new([3]byte)
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array2 = new([71]byte)
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array3 = new([3]*byte)
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}
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func newStruct() {
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struct1 = new(struct{})
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struct2 = new(struct {
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x int
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y int
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})
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struct3 = new(struct {
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x *byte
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y [60]uintptr
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z *byte
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})
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}
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func newFuncValue() *func() {
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// On some platforms that use runtime.funcValue ("switch" style) function
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// values, a func value is allocated as having two pointer words while the
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// struct looks like {unsafe.Pointer; uintptr}. This is so that the interp
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// package won't get confused, see getPointerBitmap in compiler/llvm.go for
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// details.
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return new(func())
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}
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func makeSlice() {
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slice1 = make([]byte, 5)
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slice2 = make([]*int, 5)
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slice3 = make([][]byte, 5)
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}
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func makeInterface(v complex128) interface{} {
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return v // always stored in an allocation
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}
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