From 307fc0961972ac5264d6f3459978fbec95cad3a9 Mon Sep 17 00:00:00 2001
From: Richard-Qin-X <richard.qin.001@gmail.com>
Date: Wed, 19 Aug 2026 04:27:41 +0800
Subject: [RISCV][GlobalISel] Select and expand global addresses

---
 backend/include/rcc/CodeGen/GlobalObject.h           |  9 +++++++++
 backend/include/rcc/CodeGen/InstructionDescriptor.h  |  1 +
 backend/include/rcc/CodeGen/MIRParser/MIParser.h     |  2 ++
 backend/include/rcc/CodeGen/MachineOperand.h         |  5 ++++-
 backend/include/rcc/CodeGen/MachinePseudoExpansion.h | 14 ++++++++++++++
 backend/include/rcc/CodeGen/TargetPseudoExpansion.h  |  1 +
 6 files changed, 31 insertions(+), 1 deletion(-)

(limited to 'backend/include/rcc/CodeGen')

diff --git a/backend/include/rcc/CodeGen/GlobalObject.h b/backend/include/rcc/CodeGen/GlobalObject.h
index 1ddc34a..b67421f 100644
--- a/backend/include/rcc/CodeGen/GlobalObject.h
+++ b/backend/include/rcc/CodeGen/GlobalObject.h
@@ -156,6 +156,15 @@ enum class GlobalUnnamedAddress : std::uint8_t {
   Count,
 };
 
+struct GlobalValueProperties final {
+  bool DSOLocal = false;
+  bool ExternalWeak = false;
+  bool ThreadLocal = false;
+
+  friend constexpr bool operator==(const GlobalValueProperties &Left,
+                                   const GlobalValueProperties &Right) noexcept = default;
+};
+
 struct GlobalObjectDesc final {
   std::string Symbol;
   GenericConstantType ObjectType;
diff --git a/backend/include/rcc/CodeGen/InstructionDescriptor.h b/backend/include/rcc/CodeGen/InstructionDescriptor.h
index ccd1b63..91881e6 100644
--- a/backend/include/rcc/CodeGen/InstructionDescriptor.h
+++ b/backend/include/rcc/CodeGen/InstructionDescriptor.h
@@ -195,6 +195,7 @@ enum class PseudoOwner : std::uint8_t {
   InstructionSelect,
   PhiElimination,
   TwoAddressRewrite,
+  PreRAExpansion,
   RegisterAllocator,
   PrePEIExpansion,
   PrologueEpilogueInsertion,
diff --git a/backend/include/rcc/CodeGen/MIRParser/MIParser.h b/backend/include/rcc/CodeGen/MIRParser/MIParser.h
index 0b888e5..cd40882 100644
--- a/backend/include/rcc/CodeGen/MIRParser/MIParser.h
+++ b/backend/include/rcc/CodeGen/MIRParser/MIParser.h
@@ -5,6 +5,7 @@
 
 #include "rcc/CodeGen/MachineIRTypes.h"
 #include "rcc/CodeGen/MachineMetadata.h"
+#include "rcc/CodeGen/GlobalObject.h"
 #include "rcc/CodeGen/Register.h"
 #include "rcc/Support/Error.h"
 #include "rcc/Support/TextDiagnostic.h"
@@ -66,6 +67,7 @@ struct MIParserContext final {
   std::vector<MIMetadataSlot> Metadata;
   std::vector<MISyncScopeSlot> SyncScopes;
   std::function<bool(std::string_view)> HasIRBlock;
+  std::function<GlobalValueProperties(std::string_view)> GlobalValuePropertiesForName;
   std::function<Expected<SyncScopeID>(std::string_view)> InternSyncScope;
   std::function<Expected<std::uint32_t>(std::uint32_t)> PointerSizeInBits;
 };
diff --git a/backend/include/rcc/CodeGen/MachineOperand.h b/backend/include/rcc/CodeGen/MachineOperand.h
index 1f321b0..d82e41a 100644
--- a/backend/include/rcc/CodeGen/MachineOperand.h
+++ b/backend/include/rcc/CodeGen/MachineOperand.h
@@ -5,6 +5,7 @@
 
 #include "rcc/ADT/APFloat.h"
 #include "rcc/ADT/APInt.h"
+#include "rcc/CodeGen/GlobalObject.h"
 #include "rcc/CodeGen/LowLevelType.h"
 #include "rcc/CodeGen/MachineDebugInfo.h"
 #include "rcc/CodeGen/MachineIRTypes.h"
@@ -127,6 +128,7 @@ struct JumpTableOperand final {
 struct GlobalSymbolOperand final {
   std::string Name;
   std::int64_t Offset = 0;
+  GlobalValueProperties Properties;
 
   friend bool operator==(const GlobalSymbolOperand &Left,
                          const GlobalSymbolOperand &Right) = default;
@@ -329,7 +331,8 @@ public:
   [[nodiscard]] static MachineOperand jumpTable(JumpTableIndex Index,
                                                 std::uint32_t TargetFlags = 0);
   [[nodiscard]] static Expected<MachineOperand>
-  globalSymbol(std::string Name, std::int64_t Offset = 0, std::uint32_t TargetFlags = 0);
+  globalSymbol(std::string Name, std::int64_t Offset = 0, std::uint32_t TargetFlags = 0,
+               GlobalValueProperties Properties = {});
   [[nodiscard]] static Expected<MachineOperand>
   externalSymbol(std::string Name, std::int64_t Offset = 0, std::uint32_t TargetFlags = 0);
   [[nodiscard]] static Expected<MachineOperand> blockAddress(std::string FunctionName,
diff --git a/backend/include/rcc/CodeGen/MachinePseudoExpansion.h b/backend/include/rcc/CodeGen/MachinePseudoExpansion.h
index 7d4b309..c30ba50 100644
--- a/backend/include/rcc/CodeGen/MachinePseudoExpansion.h
+++ b/backend/include/rcc/CodeGen/MachinePseudoExpansion.h
@@ -11,6 +11,20 @@ namespace rcc {
 class TargetInstrInfo;
 class TargetPseudoExpansionInfo;
 
+class PreRATargetPseudoExpansionPass final : public MachineFunctionPass {
+public:
+  explicit PreRATargetPseudoExpansionPass(const TargetPseudoExpansionInfo &Info) noexcept
+      : Info(&Info) {}
+
+  [[nodiscard]] const MachinePassContract &contract() const noexcept override;
+  [[nodiscard]] Expected<MachinePassResult> run(MachineFunction &Function,
+                                                const TargetDescription &Target,
+                                                MachineFunctionAnalysisManager &Analyses) override;
+
+private:
+  const TargetPseudoExpansionInfo *Info;
+};
+
 class PreparePostRAPseudosPass final : public MachineFunctionPass {
 public:
   explicit PreparePostRAPseudosPass(const TargetPseudoExpansionInfo &Info) noexcept : Info(&Info) {}
diff --git a/backend/include/rcc/CodeGen/TargetPseudoExpansion.h b/backend/include/rcc/CodeGen/TargetPseudoExpansion.h
index 4d9f556..5135d78 100644
--- a/backend/include/rcc/CodeGen/TargetPseudoExpansion.h
+++ b/backend/include/rcc/CodeGen/TargetPseudoExpansion.h
@@ -14,6 +14,7 @@ class MachineInstr;
 class TargetDescription;
 
 enum class MachinePseudoExpansionPhase : std::uint8_t {
+  PreRA,
   PrePEI,
   PostRA,
   TargetLate,
-- 
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