Fix the pydebug with trace refs and count_allocs for python > 3.7 #1334

cecini · 2020-12-21T05:23:13Z

There is some change for the trace refs . So fix it .
Since COUNT_ALLOCS used rarely, leave it unimpl now.

davidhewitt

Thanks for your contribution!

I have a couple of questions... see my other comments...

davidhewitt · 2020-12-21T09:22:53Z

build.rs

+        // if interpreter_config.version.minor.unwrap_or(0) < 9 {
+        // }


Dead code?

Suggested change

// if interpreter_config.version.minor.unwrap_or(0) < 9 {

// }

Since COUNT_ALLOCS used rarely, leave it unimpl now. If some one want to use it ,can continue from here.

Let's delete this code then. COUNT_ALLOCS will still work anyway; this fix_config_map function was only trying to add COUNT_ALLOCS if Py_Debug was set, which I now think was incorrect.

Suggested change

// if interpreter_config.version.minor.unwrap_or(0) < 9 {

// }

This code is for 3.8 only.
Yes, it was incorret, just as i said that according the CFlags to decide whether to set COUNT_ALLOCS as 1., no by the Py_DEBUG,
Again, Of course, if we decide never support COUNT_ALLOCS( we know >= 3.9 have remove COUNT_ALLOCS this code), we just delete this comment.

build.rs

davidhewitt

Thanks for the explanation!

I would like to see some simplifications before we merge this. Please see my other comments.

davidhewitt · 2020-12-22T12:23:14Z

build.rs

+        // find CFLAGS to whether contains the COUNT_ALLOCS then set
+        // config_map.insert("COUNT_ALLOCS".to_owned(), "1".to_owned());


I think this code might originally have been wrong (I can't see any suggestion that Py_DEBUG would set COUNT_ALLOCS in documentation), so please just delete:

Suggested change

// find CFLAGS to whether contains the COUNT_ALLOCS then set

// config_map.insert("COUNT_ALLOCS".to_owned(), "1".to_owned());

The if block is for the <= py 3.6.

Yes, I also said according the CFlags to decide whether to set COUNT_ALLOCS as 1, not by the Py_DEBUG.
But always we build python with pydebug, with debug python , we then can decide to enable COUNT_ALLOCS or disable(default disable). So i place the comment in the if Py_DEBUG block.

Of course, if decide never support COUNT_ALLOCS( we know > 3.9 have remove this code), we just delete this code.

davidhewitt · 2020-12-22T12:37:01Z

build.rs

+        // if interpreter_config.version.minor.unwrap_or(0) < 9 {
+        // }


Let's delete this code then. COUNT_ALLOCS will still work anyway; this fix_config_map function was only trying to add COUNT_ALLOCS if Py_Debug was set, which I now think was incorrect.

Suggested change

// if interpreter_config.version.minor.unwrap_or(0) < 9 {

// }

davidhewitt · 2020-12-22T12:38:10Z

build.rs

+    mut config_map: HashMap<String, String>,
+    interpreter_config: &InterpreterConfig,
+) -> HashMap<String, String> {
+    if interpreter_config.version.major == 3 && interpreter_config.version.minor.unwrap_or(0) > 7 {


I suggest the following:

Suggested change

if interpreter_config.version.major == 3 && interpreter_config.version.minor.unwrap_or(0) > 7 {

assert_eq!(interpreter_config.version.major, 3);

if interpreter_config.version.minor.unwrap_or(0) >= 8 {

Because we only support Python 3, I think it's good to just make this code fail if we ever try to run it on Python 4.

Yeah, but is this a proper place to do this assertion....?
I'd rather pass only the mimor version to this function.

Passing just the minor version instead of the full interpreter_config to this function also seems like a good idea!

will we support python 4? if support, we should keep the interpreter_config as the function argument. and leave room for the possible change in the python 4.

davidhewitt · 2020-12-22T12:40:06Z

build.rs

+        if let Some("1") = config_map.get("Py_TRACE_REFS").as_ref().map(|s| s.as_str()) {
+            config_map.insert("Py_TRACE_REFS".to_owned(), "1".to_owned());
+        }


This code looks like a no-op, please delete? It just sets Py_TRACE_REFS to 1 if Py_TRACE_REFS == 1.

Suggested change

if let Some("1") = config_map.get("Py_TRACE_REFS").as_ref().map(|s| s.as_str()) {

config_map.insert("Py_TRACE_REFS".to_owned(), "1".to_owned());

}

Oh, you are right. get config can get this info. I will fix.

cecini · 2020-12-22T17:00:51Z

refactor the pr code： pass the minor version; fix some code by suggestion.
Again, if we plan not support count_allocs, must delete the last comment in the pr.
Please give your suggestions.

davidhewitt

Perfect, thanks! See my final suggestions, then let's merge 👍

davidhewitt · 2020-12-22T21:46:19Z

build.rs

+    // py3.9 remove the COUNT_ALLOCS related code
+    // if interpreter_config.version.minor.unwrap_or(0) <= 8 {
+    //     // find CFLAGS to whether contains the COUNT_ALLOCS then set
+    //     // config_map.insert("COUNT_ALLOCS".to_owned(), "1".to_owned());
+    // }


Yes let's delete this 👍

Suggested change

// py3.9 remove the COUNT_ALLOCS related code

// if interpreter_config.version.minor.unwrap_or(0) <= 8 {

// // find CFLAGS to whether contains the COUNT_ALLOCS then set

// // config_map.insert("COUNT_ALLOCS".to_owned(), "1".to_owned());

// }

davidhewitt · 2020-12-22T21:52:47Z

build.rs

+    if version_minor.unwrap_or(0) >= 8 {
+        if let Some("1") = config_map.get("Py_DEBUG").as_ref().map(|s| s.as_str()) {
+            config_map.insert("Py_REF_DEBUG".to_owned(), "1".to_owned());
+        }
+    } else if let Some("1") = config_map.get("Py_DEBUG").as_ref().map(|s| s.as_str()) {
        config_map.insert("Py_REF_DEBUG".to_owned(), "1".to_owned());
        config_map.insert("Py_TRACE_REFS".to_owned(), "1".to_owned());


I suggest this version with less repetition:

Suggested change

if version_minor.unwrap_or(0) >= 8 {

if let Some("1") = config_map.get("Py_DEBUG").as_ref().map(|s| s.as_str()) {

config_map.insert("Py_REF_DEBUG".to_owned(), "1".to_owned());

}

} else if let Some("1") = config_map.get("Py_DEBUG").as_ref().map(|s| s.as_str()) {

config_map.insert("Py_REF_DEBUG".to_owned(), "1".to_owned());

config_map.insert("Py_TRACE_REFS".to_owned(), "1".to_owned());

if let Some("1") = config_map.get("Py_DEBUG").as_ref().map(|s| s.as_str()) {

config_map.insert("Py_REF_DEBUG".to_owned(), "1".to_owned());

if version_minor.map_or(false, |minor| minor <= 7) {

// Py_DEBUG only implies Py_TRACE_REFS until Python 3.7

config_map.insert("Py_TRACE_REFS".to_owned(), "1".to_owned());

}

davidhewitt

Thank you very much for this, looks good!

I'm going to push a CHANGELOG entry to this branch and then will proceed to merge.

cecini force-pushed the prfixbuildrs branch from 9dd5dae to 1660fe7 Compare December 21, 2020 05:45

davidhewitt reviewed Dec 21, 2020

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davidhewitt requested changes Dec 22, 2020

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cecini force-pushed the prfixbuildrs branch 3 times, most recently from 4654243 to 3e2a5b7 Compare December 22, 2020 16:54

davidhewitt reviewed Dec 22, 2020

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cecini force-pushed the prfixbuildrs branch from 3e2a5b7 to b77ba36 Compare December 23, 2020 04:36

davidhewitt approved these changes Dec 23, 2020

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Fix the pydebug with trace refs and count_allocs for python > 3.7

c780aa9

davidhewitt force-pushed the prfixbuildrs branch from b77ba36 to c780aa9 Compare December 23, 2020 16:20

davidhewitt merged commit 384f32a into PyO3:master Dec 25, 2020

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Fix the pydebug with trace refs and count_allocs for python > 3.7 #1334

Fix the pydebug with trace refs and count_allocs for python > 3.7 #1334

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		// if interpreter_config.version.minor.unwrap_or(0) < 9 {
		// }

		// find CFLAGS to whether contains the COUNT_ALLOCS then set
		// config_map.insert("COUNT_ALLOCS".to_owned(), "1".to_owned());

	if interpreter_config.version.major == 3 && interpreter_config.version.minor.unwrap_or(0) > 7 {
	assert_eq!(interpreter_config.version.major, 3);
	if interpreter_config.version.minor.unwrap_or(0) >= 8 {

	if let Some("1") = config_map.get("Py_TRACE_REFS").as_ref().map(\|s\| s.as_str()) {
	config_map.insert("Py_TRACE_REFS".to_owned(), "1".to_owned());
	}

Fix the pydebug with trace refs and count_allocs for python > 3.7 #1334

Fix the pydebug with trace refs and count_allocs for python > 3.7 #1334

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