[CodeGen] Add target register descriptions

Introduce an immutable register topology for units, subregisters, classes, banks, and preserved masks. Bind instruction descriptors to this topology through TargetDescription so builders, cloning, and verification share one target-aware contract. Add the test-only TestTarget model and positive and negative target fact coverage.

1 files changed, 4 insertions, 3 deletions

diff --git a/backend/lib/CodeGen/MachineFunctionCloner.cpp b/backend/lib/CodeGen/MachineFunctionCloner.cpp
index a8fe15e..d365fd0 100644
--- a/backend/lib/CodeGen/MachineFunctionCloner.cpp
+++ b/backend/lib/CodeGen/MachineFunctionCloner.cpp
@@ -15,6 +15,7 @@
 #include "rcc/CodeGen/MachineOperand.h"
 #include "rcc/CodeGen/MachineRegisterInfo.h"
 #include "rcc/CodeGen/MachineVerifier.h"
+#include "rcc/CodeGen/TargetDescription.h"
 #include "rcc/CodeGen/TargetFunctionState.h"
 
 #include <cstddef>
@@ -553,9 +554,9 @@ MachineFunctionCloneResult::operator=(MachineFunctionCloneResult &&) noexcept =
 MachineFunctionCloneResult::~MachineFunctionCloneResult() = default;
 
 Expected<MachineFunctionCloneResult> cloneMachineFunction(const MachineFunction &Source,
-                                                          const InstructionSet &Instructions,
+                                                          const TargetDescription &Target,
                                                           MachineFunctionCloneOptions Options) {
-  auto SourceVerification = MachineVerifier::verify(Source, Instructions);
+  auto SourceVerification = MachineVerifier::verify(Source, Target);
   if (!SourceVerification)
     return std::unexpected(SourceVerification.error());
   if (!Options.NewStableID.isValid()) {
@@ -615,7 +616,7 @@ Expected<MachineFunctionCloneResult> cloneMachineFunction(const MachineFunction
     return std::unexpected(CompilationStatus.error());
   Result.ClonedFunction->compilationStatus() = std::move(*CompilationStatus);
   Result.ClonedFunction->properties() = Source.properties();
-  auto DestinationVerification = MachineVerifier::verify(*Result.ClonedFunction, Instructions);
+  auto DestinationVerification = MachineVerifier::verify(*Result.ClonedFunction, Target);
   if (!DestinationVerification)
     return std::unexpected(DestinationVerification.error());
   return Result;