[go-nuts] [RFC] Dynamically instrumentation Go binaries

robes, which is linux-specific. And at the opposite, there are user-space binary code instrumentation libraries such as dyninst that modify the code at run time... So I am wondering if anyone here has any thoughts on this subject, that doesn't seem to be solved for Go programs. Than

[go-nuts] How to safely convert a pointer to *unsafe.Pointer

use atomic.Value which performs two atomic operations and possible disable preemption ( https://golang.org/src/sync/atomic/value.go?s=1233:1269#L35). Thanks for your help, Julio -- You received this message because you are subscribed to the Google Groups "golang-nuts" group. To unsubscribe f

[go-nuts] Distributing Go bindings: Go plugin vs Go archive vs Go shared package

nclude the resulting Go package archive in the repo, and simply use some go CLI option in order to use the correct archive for the target GOOS/GOARCH? I couldn't find out how to pass such option to the go compiler so far, so I was hoping for some help. Thanks for your help, Julio -- You receiv

[go-nuts] Assigning a value to a function pointer

using instead `*interface{}` (that I can atomically load + type-assert + call). Thanks for your help, Julio -- You received this message because you are subscribed to the Google Groups "golang-nuts" group. To unsubscribe from this group and stop receiving emails from it, send an email

Re: [go-nuts] Assigning a value to a function pointer

> > But I cannot find any way of assigning a value to the function pointer > `f` even using the `unsafe` package. > > https://play.golang.org/p/qP5kuSCW6dO > Thanks, unfortunately the asm shows that what gets into `f` is the stack address of `f0` and not the address of the function: LEAQ

[go-nuts] Enforcing a type name rather than a variable name

Hello, Is there any way to avoid the compilation error "*error is not a type" of this example https://play.golang.org/p/gWNStGSCfTm ? I understand the variable named `error` hides the type named `error` but is there some other syntax to specify the error type? I am facing this issue while writi

[go-nuts] Re: Enforcing a type name rather than a variable name

By the way, here is the function having this in package `net`: https://golang.org/src/net/lookup.go#L81 -- You received this message because you are subscribed to the Google Groups "golang-nuts" group. To unsubscribe from this group and stop receiving emails from it, send an email to golang-nu

[go-nuts] How to print an AST without formatting?

Hello, I am looking for a way to keep to original token positioning but I cannot find how to avoid it when using `go/printer` or `go/format`. Basically, how to make this example print the same string that was parsed: https://play.golang.org/p/dI7WcevQJAZ Thanks for your help! Julio -- You

Re: [go-nuts] Re: [RFC] Dynamically instrumentation Go binaries

y the best option for performance and to avoid code relocation at run time... Unfortunately, the go toolchain currently doesn't have any "plugin" interface to add extra compilation stages. -- Julio Guerra -- You received this message because you are subscribed to the Google Groups

Re: [go-nuts] [RFC] Dynamically instrumentation Go binaries

and it doesn't use any plugin interface :( -- Julio Guerra -- You received this message because you are subscribed to the Google Groups "golang-nuts" group. To unsubscribe from this group and stop receiving emails from it, send an email to golang-nuts+unsubscr...@googlegroups

Re: [go-nuts] [RFC] Dynamically instrumentation Go binaries

is twice slower. So it may be a very good solution for a first linux-only version, as I don't need return probes (uretprobes seem to be a problem with Go's dynamic stack management). -- Julio Guerra -- You received this message because you are subscribed to the Google Groups "go

[go-nuts] Getting a function's linked address?

Hello, I am wondering if it is possible to get the address of a function but at link-time. Kind of the equivalent to the C keyword `extern`. Maybe using the link name directive? But it is not super clear to me. I would like to get them instead at link time instead of using the gosymtab. Thank

Re: [go-nuts] Getting a function's linked address?

I was meaning an equivalent to declaring an extern function using the same name as the symbol we want. The function address will be the linked symbol address. I indeed use the reflect package today, but this happen at run time while I would like to get those values at link time. I'd like to crea

Re: [go-nuts] Getting a function's linked address?

> > You can create a lookup table at run time. What would change if you > could do it at link time? Can you show us the code you want to write? > This is actually linked to my remark on build-time source instrumentation on https://github.com/golang/go/issues/35204 : I insert hooks into func

[go-nuts] Re: reading from file that is closed after starting the read

I am having the same trouble with a tty too. I ended up with pthread_kill to signal the specific goroutines blocked in read: https://play.golang.org/p/VZhm2-dX0B The two goroutines share their ids and wait for each other's completion with a signal. I am not sure how safe it is. But it does the

Re: [go-nuts] Is it safe to invoke len(channel) on multi-gorountine

I almost got into the trap with this, trying to prioritize selected channel... https://play.golang.org/p/VOrPwx7HC_ -- You received this message because you are subscribed to the Google Groups "golang-nuts" group. To unsubscribe from this group and stop receiving emails from it, send an email

[go-nuts] Re: How to print an AST without formatting?

I saw `go tool cover` does it, but I don't see anything else but a simple call to printer.Fprint(w, f.fset, f.astFile) at https://github.com/golang/tools/blob/master/cmd/cover/cover.go#L384 -- You received this message because you are subscribed to the Google Groups "golang-nuts" group. To uns

Re: [go-nuts] Getting a function's linked address?

For the record, I could do what I needed using the `//go:linkname` directive. My instrumentation tool injects statements that need features from another package that I cannot import. So I forward declare functions using a given link name that is implemented in another package - similarly to wha