Desiring bool any_key_pressed()
Here is a very simple version of the program I'm working on. Is
there a way to write is_any_key_pressed() that doesn't block,
doesn't require the Enter key, and doesn't require dragging in
any complex libraries or dealing with low-level stuff like
ioctl()? Is there nothing in Phobos that provides the needed
functionality?
I won't go into the details, but I tried threading, putting the
getchar() in a separate thread that sets a global bool
g_keypressed variable. It was a disaster. Maybe there's a right
way to use threading? I am not talented at threads.
```
import core.thread;
import core.time;
import std.stdio;
import std.conv;
void light_on() {
write("on "); stdout.flush;
}
void light_off() {
write("off "); stdout.flush;
}
void wait() {
Duration dur = dur!("seconds")( to!int(1) );
Thread.sleep(dur);
}
bool is_any_key_pressed() {
getchar(); // nope, requires Enter key to be pressed, and is
blocking
return true;
}
void main(string[] args)
{
while (true) {
light_on();
wait();
light_off();
wait();
if (is_any_key_pressed()) {
break;
}
}
}
```
Some questions with D and webassembly
In webassembly, there's a type called `externref`, which opaquely
represents a javascript object. So, you could do this for
example, with this javascript:
```js
class Foo {
constructor(x) {
this.x = x;
}
}
const imports = {
env: {
fooNew: (x) => new Foo(x),
fooX: (foo) => foo.x,
fooSetX: (foo, x) => { foo.x = x; }
}
}
WebAssembly.instantiateStreaming(fetch("./foo.wasm"),
imports).then(module => {
let foo = module.instance.exports.f();
console.log(foo.x); // 5
module.instance.exports.g(foo);
console.log(foo.x); // 8
});
```
and this webassembly:
```wat
(module
(import "env" "fooNew" (func $fooNew (param i32) (result
externref)))
(import "env" "fooX" (func $fooX (result i32)))
(import "env" "fooSetX" (func $fooSetX (param externref) (param
i32)))
(func (export "f") (result externref)
i32.const 5
call $fooNew)
(func (export "g") (param $foo externref)
local.get $foo
i32.const 8
call $fooSetX))
```
5 and 8 get logged. Equivalent D to the webassembly part would be:
```d
extern(C):
// how to get this externref type?
externref fooNew(int);
externref fooX(externref);
void fooSetX(externref, int);
externref f() {
return fooNew();
}
void g(externref foo) {
fooSetX(foo, 8);
}
```
problem being, there exists no `externref` type. So how would you
achieve it with ldc2?
B) In the javascript WebAssembly API, you can pass in memory like
so:
```js
const imports = {
"mem": new WebAssembly.Memory({ initial: 1 })
}
WebAssembly.instantiateStreaming(fetch("bar.wasm"), imports,
module => { ... });
```
then in WebAssembly
```wat
(import "mem" (memory 1))
```
so how could I do that in D? That is, I want the memory that D
uses to be accessible to javascript (this way I can pass pointers
between JS and D)
Re: Bug in DMD?
On Friday, 3 March 2023 at 01:37:42 UTC, Richard (Rikki) Andrew Cattermole wrote: On 03/03/2023 2:33 PM, ryuukk_ wrote: So it is a DMD bug? Yes and thanks to you I can now say that we can absolutely get rid of DllMain requirement for DLLs! glad the outcome is positive, and i apologies about earlier comments, i may have sounded a little bit rude
Re: Bug in DMD?
On Friday, 3 March 2023 at 01:21:52 UTC, ryuukk_ wrote: I have some questions: 1. why does it work with LDC? 2. why does it work with DMD when build/link in 2 step? 3. why it doesn't work when DMD is invoked once for build/link I think these are probably coincidences and the answer can be summarized as "that's what ends up happening due to the details of the implementation". 4. is this a bug in DMD or my code is wrong? I would say the code is wrong in principle, though as you've noted it can still work in some specific circumstances. 5. if it's wrong, then why does it compile/no error? `extern(C) main` is a low-level feature, because it effectively turns off parts of the language. However, the rest of the program doesn't know that this is the case - currently the compiler simply assumes you know what you're doing. Maybe it's not OK that it's easy to use it by accident.
Re: Bug in DMD?
I added a note here: https://issues.dlang.org/show_bug.cgi?id=20737
Re: Bug in DMD?
On 03/03/2023 2:33 PM, ryuukk_ wrote: So it is a DMD bug? Yes and thanks to you I can now say that we can absolutely get rid of DllMain requirement for DLLs!
Re: Bug in DMD?
On Friday, 3 March 2023 at 01:24:42 UTC, Richard (Rikki) Andrew
Cattermole wrote:
This works:
```d
extern(C) void main()
{
Stuff[5] temp = [
Stuff(),
Stuff(),
Stuff(),
Stuff(),
Stuff(),
];
stuffs = temp[];
stuffs[0].do_something();
}
```
```d
Stuff[] stuffs;
```
The problem here is dmd isn't initializing TLS with a value,
but TLS itself is working.
So it is a DMD bug?
Re: Bug in DMD?
This works:
```d
extern(C) void main()
{
Stuff[5] temp = [
Stuff(),
Stuff(),
Stuff(),
Stuff(),
Stuff(),
];
stuffs = temp[];
stuffs[0].do_something();
}
```
```d
Stuff[] stuffs;
```
The problem here is dmd isn't initializing TLS with a value, but TLS
itself is working.
Re: Bug in DMD?
On Friday, 3 March 2023 at 01:11:06 UTC, Vladimir Panteleev wrote:
On Friday, 3 March 2023 at 01:07:07 UTC, ryuukk_ wrote:
I couldn't figure out dustmite, so i started from 0 and
managed to hit something:
https://github.com/ryuukk/dmd_bug
``Assertion failed: array index out of bounds, file
game\app.d, line 5``
Wich indicates probably TLS problem?
Yeah... `rt.a.stuffs` is a TLS variable. The D runtime manages
TLS. `extern(C) main` bypasses D runtime initialization.
I have some questions:
1. why does it work with LDC?
2. why does it work with DMD when build/link in 2 step?
3. why it doesn't work when DMD is invoked once for build/link
4. is this a bug in DMD or my code is wrong?
5. if it's wrong, then why does it compile/no error?
```sh
#!/usr/bin/env bash
set -e
build_dmd() {
echo "build dmd"
dmd \
-debug -g \
-m64 -vcolumns -betterC -w -i -i=-std -i=-core \
-Igame \
-Istuff/ \
stuff/rt/object.d \
game/app.d \
-of=game.exe
}
build_ldc() {
echo "build ldc"
ldc2 \
-d-debug -g \
-m64 -vcolumns -betterC -w -i -i=-std -i=-core \
-Igame \
-Istuff/ \
stuff/rt/object.d \
game/app.d \
-of=game.exe
}
build_dmd_and_link() {
echo "build dmd and link (2step)"
dmd \
-debug -g -c \
-m64 -vcolumns -betterC -w -i -i=-std -i=-core \
-Igame \
-Istuff/ \
stuff/rt/object.d \
game/app.d \
-of=game.obj
dmd \
-debug -g \
-m64 -vcolumns -betterC -w -i -i=-std -i=-core \
-Igame \
-Istuff/ \
game.obj \
-of=game.exe
}
build_ldc
./game.exe
rm game.obj game.exe
build_dmd_and_link
./game.exe
rm game.obj game.exe
build_dmd
./game.exe
rm game.obj game.exe
```
Re: Bug in DMD?
On Friday, 3 March 2023 at 01:07:07 UTC, ryuukk_ wrote: I couldn't figure out dustmite, so i started from 0 and managed to hit something: https://github.com/ryuukk/dmd_bug ``Assertion failed: array index out of bounds, file game\app.d, line 5`` Wich indicates probably TLS problem? Yeah... `rt.a.stuffs` is a TLS variable. The D runtime manages TLS. `extern(C) main` bypasses D runtime initialization.
Re: Bug in DMD?
I couldn't figure out dustmite, so i started from 0 and managed to hit something: https://github.com/ryuukk/dmd_bug ``Assertion failed: array index out of bounds, file game\app.d, line 5`` Wich indicates probably TLS problem? This now reminds me of: https://issues.dlang.org/show_bug.cgi?id=23310 I am clueless what to do next, but at least now there is a small repro available for knowledgeable people
Re: Bug in DMD?
On 03/03/2023 10:38 AM, ryuukk_ wrote: On Thursday, 2 March 2023 at 21:21:14 UTC, Richard (Rikki) Andrew Cattermole wrote: There isn't anything we can do without source. But here is what I would do in this situation: 1. Look at the assembly at the point of debug break, from here it should give you hints as to why its trying to write to dawn.assets.Resource init array. 2. Dustmite, so we have something we can work with. I have no idea what does 1. mean, as for 2. do you have a link for a guide how to setup "dustmite"? When debugging, native debuggers i.e. Visual Studio, will provide you with the disassembly of the function currently being executed. Between this and other entries in the call stack, you can generally figure out what the statement is being executed just by looking at things like call instructions. The symbols there will be accurate.
Re: Bug in DMD?
On 3/2/23 15:34, ryuukk_ wrote: > the problem is not that it can run in the background, the problem is > figuring out > > 1. how to install > 2. how to setup > 3. how to run I haven't used it myself but dustmite seems to be integrated into dub. 'dub dustmite <...>' Ali
Re: Bug in DMD?
On 03/03/2023 12:34 PM, ryuukk_ wrote: 1. how to install Already is. Comes with dmd and ldc. You can also just do ``$ dub run digger -- args``. 2. how to setup > 3. how to run It is a bit of a pain but the basics is you need some sort of compilation command, list of sources and a test to confirm if it still fails. https://github.com/CyberShadow/DustMite/wiki#how-to-use-it
Re: Bug in DMD?
On Thursday, 2 March 2023 at 22:24:11 UTC, H. S. Teoh wrote: On Thu, Mar 02, 2023 at 09:55:55PM +, ryuukk_ via Digitalmars-d-learn wrote: On Thursday, 2 March 2023 at 21:38:23 UTC, ryuukk_ wrote: > On Thursday, 2 March 2023 at 21:21:14 UTC, Richard (Rikki) > Andrew > Cattermole wrote: [...] > > 2. Dustmite, so we have something we can work with. > > [...] 2. do you have a link for a guide how to setup > "dustmite"? https://dlang.org/blog/2020/04/13/dustmite-the-general-purpose-data-reduction-tool/ Dustmite automatically reduces your code to a minimal example that still exhibits the same problem, good for bug reports that are easily reproducible. Also useful if you don't want to publicly share the code for whatever reason, but still want to provide enough information so that the dmd devs can find the problem and fix it. [...] That's is not something i like doing, it should just work, i shouldn't have to debug DMD, that aint my job Dustmite can run in the background on a temporary copy of your code, you don't have to babysit it and can work on other things while it's doing its thing. T the problem is not that it can run in the background, the problem is figuring out 1. how to install 2. how to setup 3. how to run i was initially working on my game, i shouldn't have to take a 1 week break to debug dmd
Re: Bug in DMD?
On Thu, Mar 02, 2023 at 09:55:55PM +, ryuukk_ via Digitalmars-d-learn wrote: > On Thursday, 2 March 2023 at 21:38:23 UTC, ryuukk_ wrote: > > On Thursday, 2 March 2023 at 21:21:14 UTC, Richard (Rikki) Andrew > > Cattermole wrote: [...] > > > 2. Dustmite, so we have something we can work with. > > > > [...] 2. do you have a link for a guide how to setup "dustmite"? https://dlang.org/blog/2020/04/13/dustmite-the-general-purpose-data-reduction-tool/ Dustmite automatically reduces your code to a minimal example that still exhibits the same problem, good for bug reports that are easily reproducible. Also useful if you don't want to publicly share the code for whatever reason, but still want to provide enough information so that the dmd devs can find the problem and fix it. [...] > That's is not something i like doing, it should just work, i shouldn't > have to debug DMD, that aint my job Dustmite can run in the background on a temporary copy of your code, you don't have to babysit it and can work on other things while it's doing its thing. T -- Written on the window of a clothing store: No shirt, no shoes, no service.
Re: Bug in DMD?
On Thursday, 2 March 2023 at 21:38:23 UTC, ryuukk_ wrote: On Thursday, 2 March 2023 at 21:21:14 UTC, Richard (Rikki) Andrew Cattermole wrote: There isn't anything we can do without source. But here is what I would do in this situation: 1. Look at the assembly at the point of debug break, from here it should give you hints as to why its trying to write to dawn.assets.Resource init array. 2. Dustmite, so we have something we can work with. I have no idea what does 1. mean, as for 2. do you have a link for a guide how to setup "dustmite"? Better, can i send you a zip of my project? i'm not sure i'm willing to waste any more time trying to figure out what is wrong That's is not something i like doing, it should just work, i shouldn't have to debug DMD, that aint my job
Re: Bug in DMD?
On Thursday, 2 March 2023 at 21:21:14 UTC, Richard (Rikki) Andrew Cattermole wrote: There isn't anything we can do without source. But here is what I would do in this situation: 1. Look at the assembly at the point of debug break, from here it should give you hints as to why its trying to write to dawn.assets.Resource init array. 2. Dustmite, so we have something we can work with. I have no idea what does 1. mean, as for 2. do you have a link for a guide how to setup "dustmite"?
Re: Bug in DMD?
There isn't anything we can do without source. But here is what I would do in this situation: 1. Look at the assembly at the point of debug break, from here it should give you hints as to why its trying to write to dawn.assets.Resource init array. 2. Dustmite, so we have something we can work with.
Re: Bug in DMD?
It crashes with a weird message, address doesn't match the mangled name: ``C:\dev\kdom\projects\dawn\gl\glad\loader.d`` inside: ``module dawn.gl.glad.loader;`` 
Bug in DMD?
Hello, I encountered a weird issue, my program segfault when i feed DMD with my files and static libs It doesn't when i compile with LDC If i split the compile/link in 2 different steps, then all works correctly DMD (1step: ⛔): https://gist.github.com/ryuukk/f0ae2ae0c8980219c04d0c6d8678940d LDC (1step: ✅): https://gist.github.com/ryuukk/4c7706697583431389d5e2074548f7c4 DMD (2step: ✅): https://gist.github.com/ryuukk/a0373339e590ecdae91e3f05b2d81bf4 Looks like DMD is messing things up when mixing code with static libraries? Toolchains: - DMD32 D Compiler v2.102.1 - LDC - the LLVM D compiler (1.32.0-beta1):
Re: foreach with assoc. array
On Wednesday, 1 March 2023 at 19:05:10 UTC, DLearner wrote:
```
Error: variable `wk_Idx` is shadowing variable
`for3.main.wk_Idx`
```
Why is this usage wrong?
Or use the `each` template which is almost the same as `foreach`
to avoid the shadowing variable issue.
```d
import std.algorithm, std.range, std.stdio;
enum len = 10;
void main()
{
int[len] IntArr, i, n;
len.iota.each!((i, n) => IntArr[i] = n);
IntArr.writeln; // [0, 1, 2, 3, 4, 5, 6, 7, 8, 9]
assert(IntArr == len.iota.array);
}
```
SDB@79
