Allow switching the Swift version in expressions

lldb/bindings/python/static-binding/lldb.py

@@ -5571,7 +5571,7 @@ def SetTrapExceptions(self, trap_exceptions=True):
     def SetLanguage(self, *args):
         r"""
         SetLanguage(SBExpressionOptions self, lldb::LanguageType language)
-        SetLanguage(SBExpressionOptions self, SBSourceLanguageName name, uint32_t version)
+        SetLanguage(SBExpressionOptions self, lldb::SBSourceLanguageName name, uint32_t version)
         Sets the language that LLDB should assume the expression is written in
         """
         return _lldb.SBExpressionOptions_SetLanguage(self, *args)

lldb/include/lldb/API/SBExpressionOptions.h

@@ -71,7 +71,7 @@ class LLDB_API SBExpressionOptions {
   /// Set the language using a pair of language code and version as
   /// defined by the DWARF 6 specification.
   /// WARNING: These codes may change until DWARF 6 is finalized.
-  void SetLanguage(SBSourceLanguageName name, uint32_t version);
+  void SetLanguage(lldb::SBSourceLanguageName name, uint32_t version);
 
 #ifndef SWIG
   void SetCancelCallback(lldb::ExpressionCancelCallback callback, void *baton);

lldb/source/API/SBExpressionOptions.cpp

@@ -156,7 +156,7 @@ void SBExpressionOptions::SetLanguage(lldb::LanguageType language) {
   m_opaque_up->SetLanguage(language);
 }
 
-void SBExpressionOptions::SetLanguage(SBSourceLanguageName name,
+void SBExpressionOptions::SetLanguage(lldb::SBSourceLanguageName name,
                                       uint32_t version) {
   LLDB_INSTRUMENT_VA(this, name, version);
 

lldb/source/Plugins/ExpressionParser/Swift/SwiftExpressionParser.cpp

@@ -1358,16 +1358,16 @@ SwiftExpressionParser::ParseAndImport(
   invocation.getFrontendOptions().ModuleName = expr_name_buf;
   invocation.getIRGenOptions().ModuleName = expr_name_buf;
 
+  auto &lang_opts = invocation.getLangOptions();
   bool enable_bare_slash_regex_literals =
       m_sc.target_sp->GetSwiftEnableBareSlashRegex();
-  if (enable_bare_slash_regex_literals) {
-    invocation.getLangOptions().enableFeature(
-        swift::Feature::BareSlashRegexLiterals);
-  }
-  if (uint32_t version = m_expr.Language().version) {
-    invocation.getLangOptions().EffectiveLanguageVersion =
+  if (enable_bare_slash_regex_literals)
+    lang_opts.enableFeature(swift::Feature::BareSlashRegexLiterals);
+  if (uint32_t version = m_expr.Language().version)
+    lang_opts.EffectiveLanguageVersion =
         llvm::VersionTuple(version / 100, version % 100);
-  }
+  if (lang_opts.EffectiveLanguageVersion >= swift::version::Version({6}))
+    lang_opts.StrictConcurrencyLevel = swift::StrictConcurrency::Complete;
 
   auto should_use_prestable_abi = [&]() {
     lldb::StackFrameSP this_frame_sp(m_stack_frame_wp.lock());
@@ -1380,8 +1380,7 @@ SwiftExpressionParser::ParseAndImport(
     return !runtime->IsABIStable();
   };
 
-  invocation.getLangOptions().UseDarwinPreStableABIBit =
-      should_use_prestable_abi();
+  lang_opts.UseDarwinPreStableABIBit = should_use_prestable_abi();
 
   LLDBNameLookup *external_lookup;
   if (m_options.GetPlaygroundTransformEnabled() || m_options.GetREPLEnabled()) {

lldb/test/API/lang/swift/expression/language_version/Makefile

@@ -0,0 +1,3 @@
+SWIFT_SOURCES := main.swift
+
+include Makefile.rules

lldb/test/API/lang/swift/expression/language_version/TestSwiftExpressionLanguageVersion.py

@@ -0,0 +1,34 @@
+import lldb
+from lldbsuite.test.lldbtest import *
+from lldbsuite.test.decorators import *
+import lldbsuite.test.lldbutil as lldbutil
+import unittest2
+
+class TestSwiftExpressionLanguageVersion(TestBase):
+    NO_DEBUG_INFO_TESTCASE = True
+
+    @swiftTest
+    def test(self):
+        """Test changing the Swift language version"""
+        self.build()
+        target, process, thread, bkpt = lldbutil.run_to_name_breakpoint(
+            self, 'main')
+
+        expr = """\
+#if swift(>=6.0)
+6
+#else
+5
+#endif
+        """
+
+        def test_version(n):
+            if self.TraceOn():
+                print("Testing version %d"%n)
+            options = lldb.SBExpressionOptions()
+            options.SetLanguage(lldb.eLanguageNameSwift, n*100 + 0)
+            value = self.frame().EvaluateExpression(expr, options)
+            self.assertEquals(value.GetValue(), "%d" % n)
+
+        test_version(5)
+        test_version(6)

lldb/test/API/lang/swift/expression/language_version/main.swift

@@ -0,0 +1 @@
+print("break here")