[riscv64]Implement PrepareForDeoptimizationExits

Bug: v8:12211

Change-Id: Ib12b2327bcbb93ef2556ce32a43a8b5749bbdd39
Reviewed-on: https://chromium-review.googlesource.com/c/v8/v8/+/3153835
Auto-Submit: Yahan Lu <yahan@iscas.ac.cn>
Commit-Queue: Ji Qiu <qiuji@iscas.ac.cn>
Reviewed-by: Ji Qiu <qiuji@iscas.ac.cn>
Cr-Commit-Position: refs/heads/main@{#76781}

src/codegen/riscv64/assembler-riscv64.h

@@ -1192,6 +1192,14 @@ class V8_EXPORT_PRIVATE Assembler : public AssemblerBase {
 
   VectorUnit VU;
 
+  void CheckTrampolinePoolQuick(int extra_instructions = 0) {
+    DEBUG_PRINTF("\tpc_offset:%d %d\n", pc_offset(),
+                 next_buffer_check_ - extra_instructions * kInstrSize);
+    if (pc_offset() >= next_buffer_check_ - extra_instructions * kInstrSize) {
+      CheckTrampolinePool();
+    }
+  }
+
  protected:
   // Readable constants for base and offset adjustment helper, these indicate if
   // aside from offset, another value like offset + 4 should fit into int16.
@@ -1270,14 +1278,6 @@ class V8_EXPORT_PRIVATE Assembler : public AssemblerBase {
 
   bool is_buffer_growth_blocked() const { return block_buffer_growth_; }
 
-  void CheckTrampolinePoolQuick(int extra_instructions = 0) {
-    DEBUG_PRINTF("\tpc_offset:%d %d\n", pc_offset(),
-                 next_buffer_check_ - extra_instructions * kInstrSize);
-    if (pc_offset() >= next_buffer_check_ - extra_instructions * kInstrSize) {
-      CheckTrampolinePool();
-    }
-  }
-
 #ifdef DEBUG
   bool EmbeddedObjectMatches(int pc_offset, Handle<Object> object) {
     return target_address_at(

src/compiler/backend/riscv64/code-generator-riscv64.cc

@@ -3061,7 +3061,17 @@ void CodeGenerator::AssembleReturn(InstructionOperand* additional_pop_count) {
 void CodeGenerator::FinishCode() { __ ForceConstantPoolEmissionWithoutJump(); }
 
 void CodeGenerator::PrepareForDeoptimizationExits(
-    ZoneDeque<DeoptimizationExit*>* exits) {}
+    ZoneDeque<DeoptimizationExit*>* exits) {
+  int total_size = 0;
+  for (DeoptimizationExit* exit : deoptimization_exits_) {
+    total_size += (exit->kind() == DeoptimizeKind::kLazy)
+                      ? Deoptimizer::kLazyDeoptExitSize
+                      : Deoptimizer::kNonLazyDeoptExitSize;
+  }
+
+  __ CheckTrampolinePoolQuick(total_size);
+  DCHECK(Deoptimizer::kSupportsFixedDeoptExitSizes);
+}
 
 void CodeGenerator::AssembleMove(InstructionOperand* source,
                                  InstructionOperand* destination) {