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[lldb][Expression] Reject languages not supported by TypeSystems for expression evaluation #156648

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[lldb][Expression] Reject languages not supported by TypeSystems for expression evaluation #156648

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5689f9e
[lldb][Expression] Reject languages not supported by TypeSystems for …
Michael137 Sep 3, 2025
74e8696
fixup! tests
Michael137 Sep 3, 2025
9626c2e
fixup! separate error messages for unknown vs. invalid language
Michael137 Sep 3, 2025
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26 changes: 17 additions & 9 deletions lldb/source/Commands/CommandObjectExpression.cpp
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Original file line number Diff line number Diff line change
Expand Up @@ -44,18 +44,26 @@ Status CommandObjectExpression::CommandOptions::SetOptionValue(
const int short_option = GetDefinitions()[option_idx].short_option;

switch (short_option) {
case 'l':
case 'l': {
language = Language::GetLanguageTypeFromString(option_arg);
if (language == eLanguageTypeUnknown) {
StreamString sstr;
sstr.Printf("unknown language type: '%s' for expression. "
"List of supported languages:\n",
if (const LanguageSet supported_languages =
Language::GetLanguagesSupportingTypeSystemsForExpressions();
supported_languages[language])
break;

StreamString sstr;
if (language == eLanguageTypeUnknown)
sstr.Printf("unknown language '%s' for expression. ",
option_arg.str().c_str());
else
sstr.Printf("language '%s' is currently not supported for expression "
"evaluation. ",
option_arg.str().c_str());

Language::PrintSupportedLanguagesForExpressions(sstr, " ", "\n");
error = Status(sstr.GetString().str());
}
break;
sstr.PutCString("List of supported languages for expressions:\n");
Language::PrintSupportedLanguagesForExpressions(sstr, " ", "\n");
error = Status(sstr.GetString().str());
} break;

case 'a': {
bool success;
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2 changes: 1 addition & 1 deletion lldb/test/API/commands/expression/calculator_mode/TestCalculatorMode.py
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Expand Up @@ -21,7 +21,7 @@ def test__calculator_mode(self):
)
# Now try it with a specific language:
self.expect(
"expression -l c -- 11 + 22",
"expression -l c++ -- 11 + 22",
"11 + 22 didn't get the expected result",
substrs=["33"],
)
16 changes: 14 additions & 2 deletions lldb/test/API/commands/expression/invalid-args/TestInvalidArgsExpression.py
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Original file line number Diff line number Diff line change
Expand Up @@ -10,8 +10,20 @@ def test_invalid_lang(self):
"expression -l foo --",
error=True,
substrs=[
"error: unknown language type: 'foo' for expression",
"List of supported languages:",
"error: unknown language 'foo' for expression.",
"List of supported languages for expressions:",
"c++",
"c++11",
"c++14",
],
)

self.expect(
"expression -l c --",
error=True,
substrs=[
"error: language 'c' is currently not supported for expression evaluation.",
"List of supported languages for expressions:",
"c++",
"c++11",
"c++14",
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