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Same transition dirs when only cmd line options differs
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Ignore user defined build settings only set on
command line and not affected by any transition,
when calculating transitionDirectoryNameFragment
output directory.

Native options on command line already have this
behavior, and this commit provides the same also
for user defined build settings.

This allows reducing transition scalability issues,
by combining transitions with command line options:

 a) Setting a limited number of common options via
    transitions, which affects large parts of the
    code base, but with limited number of variants.
 b) When needed, *also* setting a few of many
    specific options, each of them affecting only
    their parts of the code base, but with many
    variants.

Resolves #12731
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@ulrfa
ulrfa committed Sep 13, 2021
1 parent 0017fd2 commit 8f521dc
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Showing 3 changed files with 123 additions and 48 deletions.
8 changes: 5 additions & 3 deletions src/main/java/com/google/devtools/build/lib/analysis/config/CoreOptions.java
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Original file line number Diff line number Diff line change
Expand Up @@ -261,9 +261,11 @@ public String getTypeDescription() {
}

/**
* This internal option is a *set* of names (e.g. "cpu") of *native* options that have been
* changed by starlark transitions at any point in the build at the time of accessing. This is
* used to regenerate {@code transitionDirectoryNameFragment} after each starlark transition.
* This internal option is a *set* of names of options that have been changed by starlark
* transitions at any point in the build at the time of accessing. It contains both native and
* starlark options in label form. e.g. "//command_line_option:cpu" for native options and
* "//myapp:foo" for starlark options. This is used to regenerate
* {@code transitionDirectoryNameFragment} after each starlark transition.
*/
@Option(
name = "affected by starlark transition",
Expand Down
76 changes: 43 additions & 33 deletions src/main/java/com/google/devtools/build/lib/analysis/starlark/FunctionTransitionUtil.java
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Original file line number Diff line number Diff line change
Expand Up @@ -289,13 +289,14 @@ private static BuildOptions applyTransition(

if (!optionName.startsWith(COMMAND_LINE_OPTION_PREFIX)) {
// The transition changes a Starlark option.
Label optionLabel = Label.parseAbsoluteUnchecked(optionName);
Object oldValue =
fromOptions.getStarlarkOptions().get(Label.parseAbsoluteUnchecked(optionName));
fromOptions.getStarlarkOptions().get(optionLabel);
if ((oldValue == null && optionValue != null)
|| (oldValue != null && optionValue == null)
|| (oldValue != null && !oldValue.equals(optionValue))) {
changedStarlarkOptions.put(Label.parseAbsoluteUnchecked(optionName), optionValue);
convertedNewValues.add(optionName);
changedStarlarkOptions.put(optionLabel, optionValue);
convertedNewValues.add(optionLabel.toString());
}
} else {
// The transition changes a native option.
Expand Down Expand Up @@ -398,9 +399,10 @@ private static BuildOptions applyTransition(
}

/**
* Compute the output directory name fragment corresponding to the new BuildOptions based on (1)
* the names and values of all native options previously transitioned anywhere in the build by
* starlark transitions, (2) names and values of all entries in the starlark options map.
* Compute the output directory name fragment corresponding to the new BuildOptions based on
* the names and values of all options (both native and Starlark) previously transitioned
* anywhere in the build by Starlark transitions. Options only set on command line are
* not affecting the computation.
*
* @param changedOptions the names of all options changed by this transition in label form e.g.
* "//command_line_option:cpu" for native options and "//myapp:foo" for starlark options.
Expand All @@ -421,38 +423,34 @@ private static void updateOutputDirectoryNameFragment(
}

CoreOptions buildConfigOptions = toOptions.get(CoreOptions.class);
Set<String> updatedAffectedByStarlarkTransition =
new TreeSet<>(buildConfigOptions.affectedByStarlarkTransition);
// Add newly changed native options to overall list of changed native options
for (String option : changedOptions) {
if (option.startsWith(COMMAND_LINE_OPTION_PREFIX)) {
updatedAffectedByStarlarkTransition.add(
option.substring(COMMAND_LINE_OPTION_PREFIX.length()));
}
}
buildConfigOptions.affectedByStarlarkTransition =
ImmutableList.sortedCopyOf(updatedAffectedByStarlarkTransition);

// hash all relevant native option values;
updateAffectedByStarlarkTransition(buildConfigOptions, changedOptions);

TreeMap<String, Object> toHash = new TreeMap<>();
for (String nativeOption : updatedAffectedByStarlarkTransition) {
Object value;
try {
value =
optionInfoMap
.get(nativeOption)
.getDefinition()
.getField()
.get(toOptions.get(optionInfoMap.get(nativeOption).getOptionClass()));
} catch (IllegalAccessException e) {
throw new RuntimeException(
"IllegalAccess for option " + nativeOption + ": " + e.getMessage());
for (String optionName : buildConfigOptions.affectedByStarlarkTransition) {
if (optionName.startsWith(COMMAND_LINE_OPTION_PREFIX)) {
String nativeOptionName = optionName.substring(COMMAND_LINE_OPTION_PREFIX.length());
Object value;
try {
value =
optionInfoMap
.get(nativeOptionName)
.getDefinition()
.getField()
.get(toOptions.get(optionInfoMap.get(nativeOptionName).getOptionClass()));
} catch (IllegalAccessException e) {
throw new RuntimeException(
"IllegalAccess for option " + nativeOptionName + ": " + e.getMessage());
}
toHash.put(optionName, value);
} else {
Object value = toOptions.getStarlarkOptions().get(Label.parseAbsoluteUnchecked(optionName));
if (value != null) {
toHash.put(optionName, value);
}
}
toHash.put(nativeOption, value);
}

// hash all starlark options in map.
toOptions.getStarlarkOptions().forEach((opt, value) -> toHash.put(opt.toString(), value));
ImmutableList.Builder<String> hashStrs = ImmutableList.builderWithExpectedSize(toHash.size());
for (Map.Entry<String, Object> singleOptionAndValue : toHash.entrySet()) {
String toAdd = singleOptionAndValue.getKey() + "=" + singleOptionAndValue.getValue();
Expand All @@ -462,6 +460,18 @@ private static void updateOutputDirectoryNameFragment(
transitionDirectoryNameFragment(hashStrs.build());
}

/**
* Extend the global build config affectedByStarlarkTransition, by adding any new option names
* from changedOptions
*/
private static void updateAffectedByStarlarkTransition(CoreOptions buildConfigOptions, Set<String> changedOptions) {
Set<String> mutableCopyToUpdate = new TreeSet<>(buildConfigOptions.affectedByStarlarkTransition);
for (String option : changedOptions) {
mutableCopyToUpdate.add(option);
}
buildConfigOptions.affectedByStarlarkTransition = ImmutableList.sortedCopyOf(mutableCopyToUpdate);
}

public static String transitionDirectoryNameFragment(Iterable<String> opts) {
Fingerprint fp = new Fingerprint();
for (String opt : opts) {
Expand Down
87 changes: 75 additions & 12 deletions src/test/java/com/google/devtools/build/lib/analysis/StarlarkAttrTransitionProviderTest.java
View file
Original file line number Diff line number Diff line change
Expand Up @@ -1137,10 +1137,66 @@ public void testTransitionOnBuildSetting_fromCommandLine() throws Exception {
.isEqualTo(StarlarkInt.of(42));
}

@Test
public void testTransitionOnBuildSetting_onlyTransitionsAffectsDirectory() throws Exception {
writeAllowlistFile();
writeBuildSettingsBzl();
writeRulesWithAttrTransitionBzl();
scratch.file(
"test/starlark/BUILD",
"load('//test/starlark:rules.bzl', 'my_rule')",
"load('//test/starlark:build_settings.bzl', 'int_flag')",
"my_rule(name = 'test', dep = ':dep')",
"my_rule(name = 'dep')",
"int_flag(name = 'the-answer', build_setting_default = 0)",
"int_flag(name = 'cmd-line-option', build_setting_default = 0)");

useConfiguration(ImmutableMap.of("//test/starlark:cmd-line-option", 100),
"--cpu=FOO");

ConfiguredTarget test = getConfiguredTarget("//test/starlark:test");

@SuppressWarnings("unchecked")
ConfiguredTarget dep =
Iterables.getOnlyElement(
(List<ConfiguredTarget>) getMyInfoFromTarget(test).getValue("dep"));

// Assert starlark option set via transition.
assertThat(
getStarlarkOption(dep, "//test/starlark:the-answer"))
.isEqualTo(StarlarkInt.of(42));

// Assert starlark option set via command line.
assertThat(
getStarlarkOption(dep, "//test/starlark:cmd-line-option"))
.isEqualTo(100);

// Assert native option set via command line.
assertThat(
getCoreOptions(dep).cpu)
.isEqualTo("FOO");

// Assert that transitionDirectoryNameFragment is only affected by options
// set via transitions. Not by native or starlark options set via command line,
// never touched by any transition.
assertThat(getCoreOptions(dep).transitionDirectoryNameFragment)
.isEqualTo(
FunctionTransitionUtil.transitionDirectoryNameFragment(
ImmutableList.of("//test/starlark:the-answer=42")));
}

private CoreOptions getCoreOptions(ConfiguredTarget target) {
return getConfiguration(target).getOptions().get(CoreOptions.class);
}

private ImmutableMap<Label, Object> getStarlarkOptions(ConfiguredTarget target) {
return getConfiguration(target).getOptions().getStarlarkOptions();
}

private Object getStarlarkOption(ConfiguredTarget target, String absName) {
return getStarlarkOptions(target).get(Label.parseAbsoluteUnchecked(absName));
}

@Test
public void testOutputDirHash_multipleNativeOptionTransitions() throws Exception {
writeAllowlistFile();
Expand Down Expand Up @@ -1182,7 +1238,7 @@ public void testOutputDirHash_multipleNativeOptionTransitions() throws Exception

List<String> affectedOptions = getCoreOptions(test).affectedByStarlarkTransition;

assertThat(affectedOptions).containsExactly("foo");
assertThat(affectedOptions).containsExactly("//command_line_option:foo");

@SuppressWarnings("unchecked")
ConfiguredTarget dep =
Expand All @@ -1191,17 +1247,17 @@ public void testOutputDirHash_multipleNativeOptionTransitions() throws Exception

affectedOptions = getCoreOptions(dep).affectedByStarlarkTransition;

assertThat(affectedOptions).containsExactly("foo", "bar");
assertThat(affectedOptions).containsExactly("//command_line_option:foo", "//command_line_option:bar");

assertThat(getCoreOptions(test).transitionDirectoryNameFragment)
.isEqualTo(
FunctionTransitionUtil.transitionDirectoryNameFragment(
ImmutableList.of("foo=foosball")));
ImmutableList.of("//command_line_option:foo=foosball")));

assertThat(getCoreOptions(dep).transitionDirectoryNameFragment)
.isEqualTo(
FunctionTransitionUtil.transitionDirectoryNameFragment(
ImmutableList.of("bar=barsball", "foo=foosball")));
ImmutableList.of("//command_line_option:bar=barsball", "//command_line_option:foo=foosball")));
}

// Test that a no-op starlark transition to an already starlark transitioned configuration
Expand Down Expand Up @@ -1523,8 +1579,7 @@ public void testOutputDirHash_multipleStarlarkTransitions() throws Exception {
List<String> affectedOptions =
getConfiguration(dep).getOptions().get(CoreOptions.class).affectedByStarlarkTransition;

// Assert that affectedOptions is empty but final fragment is still different.
assertThat(affectedOptions).isEmpty();
assertThat(affectedOptions).containsExactly("//test:bar", "//test:foo");
assertThat(getCoreOptions(test).transitionDirectoryNameFragment)
.isEqualTo(
FunctionTransitionUtil.transitionDirectoryNameFragment(
Expand Down Expand Up @@ -1611,12 +1666,12 @@ public void testOutputDirHash_multipleMixedTransitions() throws Exception {
List<String> affectedOptionsTop =
getConfiguration(top).getOptions().get(CoreOptions.class).affectedByStarlarkTransition;

assertThat(affectedOptionsTop).containsExactly("foo");
assertThat(affectedOptionsTop).containsExactly("//command_line_option:foo");
assertThat(getConfiguration(top).getOptions().getStarlarkOptions()).isEmpty();
assertThat(getCoreOptions(top).transitionDirectoryNameFragment)
.isEqualTo(
FunctionTransitionUtil.transitionDirectoryNameFragment(
ImmutableList.of("foo=foosball")));
ImmutableList.of("//command_line_option:foo=foosball")));

// test:middle (foo_transition, zee_transition, bar_transition)
@SuppressWarnings("unchecked")
Expand All @@ -1626,14 +1681,19 @@ public void testOutputDirHash_multipleMixedTransitions() throws Exception {
List<String> affectedOptionsMiddle =
getConfiguration(middle).getOptions().get(CoreOptions.class).affectedByStarlarkTransition;

assertThat(affectedOptionsMiddle).containsExactly("foo", "bar");
assertThat(affectedOptionsMiddle).containsExactly(
"//command_line_option:foo", "//command_line_option:bar", "//test:zee");

assertThat(getConfiguration(middle).getOptions().getStarlarkOptions().entrySet())
.containsExactly(
Maps.immutableEntry(Label.parseAbsoluteUnchecked("//test:zee"), "zeesball"));

assertThat(getCoreOptions(middle).transitionDirectoryNameFragment)
.isEqualTo(
FunctionTransitionUtil.transitionDirectoryNameFragment(
ImmutableList.of("//test:zee=zeesball", "bar=barsball", "foo=foosball")));
ImmutableList.of("//command_line_option:bar=barsball",
"//command_line_option:foo=foosball",
"//test:zee=zeesball")));

// test:bottom (foo_transition, zee_transition, bar_transition, xan_transition)
@SuppressWarnings("unchecked")
Expand All @@ -1644,7 +1704,9 @@ public void testOutputDirHash_multipleMixedTransitions() throws Exception {
List<String> affectedOptionsBottom =
getConfiguration(bottom).getOptions().get(CoreOptions.class).affectedByStarlarkTransition;

assertThat(affectedOptionsBottom).containsExactly("foo", "bar");
assertThat(affectedOptionsBottom).containsExactly(
"//command_line_option:foo", "//command_line_option:bar", "//test:xan", "//test:zee");

assertThat(getConfiguration(bottom).getOptions().getStarlarkOptions().entrySet())
.containsExactly(
Maps.immutableEntry(Label.parseAbsoluteUnchecked("//test:zee"), "zeesball"),
Expand All @@ -1653,7 +1715,8 @@ public void testOutputDirHash_multipleMixedTransitions() throws Exception {
.isEqualTo(
FunctionTransitionUtil.transitionDirectoryNameFragment(
ImmutableList.of(
"//test:xan=xansball", "//test:zee=zeesball", "bar=barsball", "foo=foosball")));
"//command_line_option:bar=barsball", "//command_line_option:foo=foosball",
"//test:xan=xansball", "//test:zee=zeesball")));
}

@Test
Expand Down

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