Merge branch 'backend' into deploy-20250820

src/include/backend/RISCv64/RISCv64Backend.h

@@ -6,6 +6,7 @@
 
 extern int DEBUG;
 extern int DEEPDEBUG;
+extern int optLevel;
 
 namespace sysy {
 

src/include/backend/RISCv64/RISCv64LLIR.h

@@ -326,12 +326,19 @@ public:
     void addBlock(std::unique_ptr<MachineBasicBlock> block) {
         blocks.push_back(std::move(block));
     }
+    void addProtectedArgumentVReg(unsigned vreg) {
+        protected_argument_vregs.insert(vreg);
+    }
+    const std::set<unsigned>& getProtectedArgumentVRegs() const {
+        return protected_argument_vregs;
+    }
 private:
     Function* F;
     RISCv64ISel* isel; // 指向创建它的ISel，用于获取vreg映射等信息
     std::string name;
     std::vector<std::unique_ptr<MachineBasicBlock>> blocks;
     StackFrameInfo frame_info;
+    std::set<unsigned> protected_argument_vregs;
 };
 inline bool isMemoryOp(RVOpcodes opcode) {
     switch (opcode) {

src/include/backend/RISCv64/RISCv64RegAlloc.h

@@ -45,12 +45,11 @@ private:
     void rewriteProgram();
     bool doAllocation();
     void applyColoring();
-
-    void dumpState(const std::string &stage);
-
     void precolorByCallingConvention();
+    void protectCrossCallVRegs();
 
     // --- 辅助函数 ---
+    void dumpState(const std::string &stage);
     void getInstrUseDef(const MachineInstr* instr, VRegSet& use, VRegSet& def);
     void getInstrUseDef_Liveness(const MachineInstr *instr, VRegSet &use, VRegSet &def);
     void addEdge(unsigned u, unsigned v);