[turbofan]: Support using push instructions for setting up tail call parameters

src/compiler/code-generator.cc

 // Copyright 2013 the V8 project authors. All rights reserved.
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
 #include "src/compiler/code-generator.h"
 
 #include "src/address-map.h"
 #include "src/compiler/code-generator-impl.h"
 #include "src/compiler/linkage.h"
 #include "src/compiler/pipeline.h"
@@ skipping 404 matching lines @@
       base::OS::SNPrintF(buffer.start(), buffer.length(), "-- %s:%d:%d --",
                          file->ToCString().get(), ln, cn);
     } else {
       base::OS::SNPrintF(buffer.start(), buffer.length(),
                          "-- <unknown>:%d:%d --", ln, cn);
     }
     masm()->RecordComment(buffer.start());
   }
 }
 
+bool CodeGenerator::GetSlotAboveSPAfterGap(Instruction* instr, int* slot) {
+  if (instr->IsTailCall()) {
+    InstructionOperandConverter g(this, instr);
+    *slot = g.InputInt32(instr->InputCount() - 1);
+    return true;
+  } else {
+    return false;
+  }
+}
 
 void CodeGenerator::AssembleGaps(Instruction* instr) {
+  AssemblePreGaps(instr);
   for (int i = Instruction::FIRST_GAP_POSITION;
        i <= Instruction::LAST_GAP_POSITION; i++) {
     Instruction::GapPosition inner_pos =
         static_cast<Instruction::GapPosition>(i);
     ParallelMove* move = instr->GetParallelMove(inner_pos);
     if (move != nullptr) resolver()->Resolve(move);
   }
+  AssemblePostGaps(instr);
 }
 
 
 void CodeGenerator::PopulateDeoptimizationData(Handle<Code> code_object) {
   CompilationInfo* info = this->info();
   int deopt_count = static_cast<int>(deoptimization_states_.size());
   if (deopt_count == 0 && !info->is_osr()) return;
   Handle<DeoptimizationInputData> data =
       DeoptimizationInputData::New(isolate(), deopt_count, TENURED);
 
@@ skipping 353 matching lines @@
 DeoptimizationExit* CodeGenerator::AddDeoptimizationExit(
     Instruction* instr, size_t frame_state_offset) {
   int const deoptimization_id = BuildTranslation(
       instr, -1, frame_state_offset, OutputFrameStateCombine::Ignore());
   DeoptimizationExit* const exit =
       new (zone()) DeoptimizationExit(deoptimization_id);
   deoptimization_exits_.push_back(exit);
   return exit;
 }
 
-int CodeGenerator::TailCallFrameStackSlotDelta(int stack_param_delta) {
-  // Leave the PC on the stack on platforms that have that as part of their ABI
-  int pc_slots = V8_TARGET_ARCH_STORES_RETURN_ADDRESS_ON_STACK ? 1 : 0;
-  int sp_slot_delta = frame_access_state()->has_frame()
-                          ? (frame()->GetTotalFrameSlotCount() - pc_slots)
-                          : 0;
-  // Discard only slots that won't be used by new parameters.
-  sp_slot_delta += stack_param_delta;
-  return sp_slot_delta;
-}
-
-
 OutOfLineCode::OutOfLineCode(CodeGenerator* gen)
     : frame_(gen->frame()), masm_(gen->masm()), next_(gen->ools_) {
   gen->ools_ = this;
 }
 
 
 OutOfLineCode::~OutOfLineCode() {}
 
 }  // namespace compiler
 }  // namespace internal
 }  // namespace v8