[CodeGen] Match LLVM Legalizer ownership

1 files changed, 47 insertions, 0 deletions

diff --git a/backend/include/rcc/CodeGen/GlobalISel/LegalizerHelper.h b/backend/include/rcc/CodeGen/GlobalISel/LegalizerHelper.h
new file mode 100644
index 0000000..9a34898
--- /dev/null
+++ b/backend/include/rcc/CodeGen/GlobalISel/LegalizerHelper.h
@@ -0,0 +1,47 @@
+// SPDX-License-Identifier: GPL-3.0-or-later
+
+#ifndef RCC_CODEGEN_GLOBALISEL_LEGALIZERHELPER_H
+#define RCC_CODEGEN_GLOBALISEL_LEGALIZERHELPER_H
+
+#include "rcc/CodeGen/GenericOpcodes.h"
+#include "rcc/CodeGen/GlobalISel/LegalizerInfo.h"
+#include "rcc/CodeGen/MachineIRBuilder.h"
+#include "rcc/Support/Error.h"
+
+namespace rcc {
+
+class MachineFunction;
+class MachineInstr;
+class GISelChangeObserver;
+
+class LegalizerHelper final {
+public:
+  MachineIRBuilder &MIRBuilder;
+  GISelChangeObserver &Observer;
+
+  LegalizerHelper(MachineFunction &Function, const LegalizerInfo &Info,
+                  GISelChangeObserver &Observer, MachineIRBuilder &MIRBuilder);
+
+  [[nodiscard]] Expected<void> legalize(MachineInstr &Instruction,
+                                        const LegalizationDecision &Decision);
+  [[nodiscard]] Expected<void> lower(MachineInstr &Instruction,
+                                     const LegalizationDecision &Decision);
+  [[nodiscard]] Expected<void> lowerVAArg(MachineInstr &Instruction);
+  [[nodiscard]] Expected<void> widenScalar(MachineInstr &Instruction, std::size_t TypeIndex,
+                                           LowLevelType WideType);
+  [[nodiscard]] Expected<void> widenScalarSrc(MachineInstr &Instruction, LowLevelType WideType,
+                                              std::size_t OperandIndex,
+                                              GenericOpcode ExtensionOpcode);
+  [[nodiscard]] Expected<void> widenScalarDst(MachineInstr &Instruction, LowLevelType WideType,
+                                              std::size_t OperandIndex = 0,
+                                              GenericOpcode TruncOpcode = GenericOpcode::G_TRUNC);
+
+private:
+  MachineFunction &Function;
+  MachineRegisterInfo &MRI;
+  const LegalizerInfo &Info;
+};
+
+} // namespace rcc
+
+#endif // RCC_CODEGEN_GLOBALISEL_LEGALIZERHELPER_H