英文:
How to define a function on a struct pointer in assembly?
问题
例如：
// dummy.go
type dummy struct {
p uintptr
}
func (d dummy) Get(i int) uint64
//func (d *dummy) Get(i int) uint64 //无法在汇编中定义*dummy
func (d dummy) Get 可以定义为：
// dummy_amd64.s
#include "textflag.h"
TEXT ·dummy·Get(SB),NOSPLIT,$0
MOVQ $42, 24(SP)
RET
我尝试了以下几种方式：
TEXT "".(*dummy).Get+0(SB),4,$0-24 //output from 6g -S
TEXT ·(*dummy)·Get+0(SB),4,$0
TEXT ·*dummy·Get(SB),NOSPLIT,$0
//and
TEXT ·(*dummy)·Get(SB),NOSPLIT,$0
它们都给我返回了相同的错误：
语法错误，最后一个名称：""
我确定我漏掉了一些明显的东西，但我似乎无法弄清楚。
英文:
For example:
// dummy.go
type dummy struct {
p uintptr
}
func (d dummy) Get(i int) uint64
//func (d *dummy) Get(i int) uint64 //no way to define *dummy in assembly
func (d dummy) Get can be defined as:
// dummy_amd64.s
#include "textflag.h"
TEXT ·dummy·Get(SB),NOSPLIT,$0
MOVQ $42, 24(SP)
RET
I tried
TEXT "".(*dummy).Get+0(SB),4,$0-24 //output from 6g -S
TEXT ""·(*dummy)·Get+0(SB),4,$0
TEXT ·*dummy·Get(SB),NOSPLIT,$0
//and
TEXT ·(*dummy)·Get(SB),NOSPLIT,$0
All of them gives me the same error:
>syntax error, last name: "".
I'm sure I'm missing something obvious but I can't seem to figure it out.
答案1
得分: 3
这在当前的工具链中实际上是不可能的。该上下文在问题4978中有解释。
请注意，有一个简单的补丁可以启用此功能，但只有少数人在使用它。
您可以编写一个普通的汇编函数（即非方法），并在Go方法中实现对该汇编函数的调用。但是，编译器不会优化掉额外的调用。
解决这个问题的一个可能的方法是实现一些支持，允许将汇编函数内联到Go代码中-这将带来更多的好处。据我了解，过去曾经讨论过这个问题，但目前还没有计划。
英文:
This is actually not possible with the current toolchain. The context is explained in issue 4978
Note that there is a simple patch to enable this feature - but only a few people are using it.
You could write a normal assembly function (i.e. not method), and implement a call in the Go method, to this assembly function. But the extra call will not be optimized away by the compiler.
A possible workaround to this problem would be to implement some support to allow assembly functions to be inlined in Go code - which would bring more benefits. My understanding is it has been discussed in the past, but it is not planned yet.
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