f180339d6b
This gives a small improvement now, and is needed to be able to use the
Heap2Stack transform that's available in the Attributor pass. This
Heap2Stack transform could replace our custom OptimizeAllocs pass.
Most of the changes are just IR that changed, the actual change is
relatively small.
To give an example of why this is useful, here is the code size before
this change:
$ tinygo build -o test -size=short ./testdata/stdlib.go
code data bss | flash ram
95620 1812 968 | 97432 2780
$ tinygo build -o test -size=short ./testdata/stdlib.go
code data bss | flash ram
95380 1812 968 | 97192 2780
That's a 0.25% reduction. Not a whole lot, but nice for such a small
patch.
86 строки
1,7 КиБ
Go
86 строки
1,7 КиБ
Go
package main
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func main() {
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n1 := 5
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derefInt(&n1)
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// This should eventually be modified to not escape.
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n2 := 6 // OUT: object allocated on the heap: escapes at line 9
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returnIntPtr(&n2)
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s1 := make([]int, 3)
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readIntSlice(s1)
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s2 := [3]int{}
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readIntSlice(s2[:])
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// This should also be modified to not escape.
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s3 := make([]int, 3) // OUT: object allocated on the heap: escapes at line 19
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returnIntSlice(s3)
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useSlice(make([]int, getUnknownNumber())) // OUT: object allocated on the heap: size is not constant
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s4 := make([]byte, 300) // OUT: object allocated on the heap: object size 300 exceeds maximum stack allocation size 256
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readByteSlice(s4)
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s5 := make([]int, 4) // OUT: object allocated on the heap: escapes at line 27
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_ = append(s5, 5)
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s6 := make([]int, 3)
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s7 := []int{1, 2, 3}
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copySlice(s6, s7)
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c1 := getComplex128() // OUT: object allocated on the heap: escapes at line 34
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useInterface(c1)
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n3 := 5
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func() int {
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return n3
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}()
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callVariadic(3, 5, 8) // OUT: object allocated on the heap: escapes at line 41
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s8 := []int{3, 5, 8} // OUT: object allocated on the heap: escapes at line 44
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callVariadic(s8...)
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n4 := 3 // OUT: object allocated on the heap: escapes at line 48
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n5 := 7 // OUT: object allocated on the heap: escapes at line 48
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func() {
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n4 = n5
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}()
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println(n4, n5)
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}
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func derefInt(x *int) int {
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return *x
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}
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func returnIntPtr(x *int) *int {
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return x
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}
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func readIntSlice(s []int) int {
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return s[1]
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}
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func readByteSlice(s []byte) byte {
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return s[1]
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}
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func returnIntSlice(s []int) []int {
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return s
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}
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func getUnknownNumber() int
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func copySlice(out, in []int) {
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copy(out, in)
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}
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func getComplex128() complex128
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func useInterface(interface{})
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func callVariadic(...int)
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func useSlice([]int)
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