[all-commits] [llvm/llvm-project] aca0ce: [clang] Reland: fix getTemplateInstantiationArgs (...

[Matheus Izvekov via All-commits]

  Branch: refs/heads/main
  Home:   https://github.com/llvm/llvm-project
  Commit: aca0ce5a7339a892e6405f23f19cb7a9931e18e7
      https://github.com/llvm/llvm-project/commit/aca0ce5a7339a892e6405f23f19cb7a9931e18e7
  Author: Matheus Izvekov <mizvekov at gmail.com>
  Date:   2026-06-07 (Sun, 07 Jun 2026)

  Changed paths:
    M clang-tools-extra/clang-tidy/misc/DefinitionsInHeadersCheck.cpp
    M clang-tools-extra/clangd/SemanticHighlighting.cpp
    M clang-tools-extra/clangd/refactor/tweaks/DefineInline.cpp
    M clang/docs/ReleaseNotes.rst
    M clang/include/clang/AST/Decl.h
    M clang/include/clang/AST/DeclTemplate.h
    M clang/include/clang/AST/JSONNodeDumper.h
    M clang/include/clang/AST/RecursiveASTVisitor.h
    M clang/include/clang/ASTMatchers/ASTMatchers.h
    M clang/include/clang/ASTMatchers/ASTMatchersInternal.h
    M clang/include/clang/Basic/Specifiers.h
    M clang/include/clang/Sema/Sema.h
    M clang/lib/AST/ASTContext.cpp
    M clang/lib/AST/ASTDumper.cpp
    M clang/lib/AST/ASTImporter.cpp
    M clang/lib/AST/Comment.cpp
    M clang/lib/AST/Decl.cpp
    M clang/lib/AST/DeclPrinter.cpp
    M clang/lib/AST/DeclTemplate.cpp
    M clang/lib/AST/JSONNodeDumper.cpp
    M clang/lib/AST/TextNodeDumper.cpp
    M clang/lib/ASTMatchers/Dynamic/Registry.cpp
    M clang/lib/Analysis/ExprMutationAnalyzer.cpp
    M clang/lib/CIR/CodeGen/CIRGenVTables.cpp
    M clang/lib/CodeGen/CGVTables.cpp
    M clang/lib/Index/IndexingContext.cpp
    M clang/lib/InstallAPI/Visitor.cpp
    M clang/lib/Parse/ParseDeclCXX.cpp
    M clang/lib/Sema/HLSLExternalSemaSource.cpp
    M clang/lib/Sema/SemaConcept.cpp
    M clang/lib/Sema/SemaDecl.cpp
    M clang/lib/Sema/SemaDeclCXX.cpp
    M clang/lib/Sema/SemaExprMember.cpp
    M clang/lib/Sema/SemaOverload.cpp
    M clang/lib/Sema/SemaTemplate.cpp
    M clang/lib/Sema/SemaTemplateDeduction.cpp
    M clang/lib/Sema/SemaTemplateDeductionGuide.cpp
    M clang/lib/Sema/SemaTemplateInstantiate.cpp
    M clang/lib/Sema/SemaTemplateInstantiateDecl.cpp
    M clang/lib/Serialization/ASTReaderDecl.cpp
    M clang/lib/Serialization/ASTWriterDecl.cpp
    M clang/lib/StaticAnalyzer/Core/BugSuppression.cpp
    M clang/lib/Tooling/Syntax/BuildTree.cpp
    M clang/test/AST/ast-dump-templates-pattern.cpp
    M clang/test/CXX/basic/basic.link/p11.cpp
    M clang/test/CXX/temp/temp.arg/temp.arg.template/p3-2a.cpp
    M clang/test/CXX/temp/temp.constr/temp.constr.decl/p4.cpp
    M clang/test/CXX/temp/temp.decls/temp.spec.partial/temp.spec.partial.member/p2.cpp
    M clang/test/CXX/temp/temp.spec/temp.expl.spec/p7.cpp
    M clang/test/CodeGenCXX/default-arguments.cpp
    M clang/test/CodeGenCXX/explicit-instantiation.cpp
    M clang/test/SemaCXX/deduced-return-type-cxx14.cpp
    M clang/test/SemaTemplate/concepts-out-of-line-def.cpp
    M clang/test/SemaTemplate/friend-template.cpp
    M clang/test/SemaTemplate/instantiate-scope.cpp
    M clang/test/Templight/templight-default-func-arg.cpp
    M clang/test/Templight/templight-empty-entries-fix.cpp
    M clang/tools/libclang/CIndex.cpp
    M clang/unittests/AST/ASTImporterTest.cpp
    M clang/unittests/ASTMatchers/ASTMatchersTraversalTest.cpp
    M lldb/source/Plugins/Language/CPlusPlus/CPlusPlusLanguage.cpp
    M lldb/source/Plugins/TypeSystem/Clang/TypeSystemClang.cpp

  Log Message:
  -----------
  [clang] Reland: fix getTemplateInstantiationArgs (#202088)

Relands https://github.com/llvm/llvm-project/pull/199528
Previous: #201373

This implements a new strategy for collecting the template arguments, by
relying on the qualifiers and template parameter lists to navigate the
template
context of out-of-line definitions.

This greatly simplifies the signature of that function, by removing a
bunch
of workarounds, and simpliffying a couple that weren't removed yet.

Since this now relies on qualifiers and template parameter lists,
this patch expends most of its effort making sure these are placed,
transformed and propagated to template instantiations.

Also makes the explicit specialization AST nodes stop abusing the
template
parameter lists by storing it's own template parameter list, creating a
dedicated field for them, similar to partial specializations.



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