Remove obsolete support for an experimental multipass compiler.

src/x64/cfg-x64.cc

-// Copyright 2009 the V8 project authors. All rights reserved.
-// Redistribution and use in source and binary forms, with or without
-// modification, are permitted provided that the following conditions are
-// met:
-//
-//     * Redistributions of source code must retain the above copyright
-//       notice, this list of conditions and the following disclaimer.
-//     * Redistributions in binary form must reproduce the above
-//       copyright notice, this list of conditions and the following
-//       disclaimer in the documentation and/or other materials provided
-//       with the distribution.
-//     * Neither the name of Google Inc. nor the names of its
-//       contributors may be used to endorse or promote products derived
-//       from this software without specific prior written permission.
-//
-// THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
-// "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
-// LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
-// A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
-// OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
-// SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
-// LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
-// DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
-// THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
-// (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
-// OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
-
-#include "v8.h"
-
-#include "cfg.h"
-#include "codegen-inl.h"
-#include "codegen-x64.h"
-#include "debug.h"
-#include "macro-assembler-x64.h"
-
-namespace v8 {
-namespace internal {
-
-#define __ ACCESS_MASM(masm)
-
-void InstructionBlock::Compile(MacroAssembler* masm) {
-  ASSERT(!is_marked());
-  is_marked_ = true;
-  {
-    Comment cmt(masm, "[ InstructionBlock");
-    for (int i = 0, len = instructions_.length(); i < len; i++) {
-      // If the location of the current instruction is a temp, then the
-      // instruction cannot be in tail position in the block.  Allocate the
-      // temp based on peeking ahead to the next instruction.
-      Instruction* instr = instructions_[i];
-      Location* loc = instr->location();
-      if (loc->is_temporary()) {
-        instructions_[i+1]->FastAllocate(TempLocation::cast(loc));
-      }
-      instructions_[i]->Compile(masm);
-    }
-  }
-  successor_->Compile(masm);
-}
-
-
-void EntryNode::Compile(MacroAssembler* masm) {
-  ASSERT(!is_marked());
-  is_marked_ = true;
-  Label deferred_enter, deferred_exit;
-  {
-    Comment cmnt(masm, "[ EntryNode");
-    __ push(rbp);
-    __ movq(rbp, rsp);
-    __ push(rsi);
-    __ push(rdi);
-    int count = CfgGlobals::current()->fun()->scope()->num_stack_slots();
-    if (count > 0) {
-      __ LoadRoot(kScratchRegister, Heap::kUndefinedValueRootIndex);
-      for (int i = 0; i < count; i++) {
-        __ push(kScratchRegister);
-      }
-    }
-    if (FLAG_trace) {
-      __ CallRuntime(Runtime::kTraceEnter, 0);
-    }
-    if (FLAG_check_stack) {
-      ExternalReference stack_limit =
-          ExternalReference::address_of_stack_guard_limit();
-      __ movq(kScratchRegister, stack_limit);
-      __ cmpq(rsp, Operand(kScratchRegister, 0));
-      __ j(below, &deferred_enter);
-      __ bind(&deferred_exit);
-    }
-  }
-  successor_->Compile(masm);
-  if (FLAG_check_stack) {
-    Comment cmnt(masm, "[ Deferred Stack Check");
-    __ bind(&deferred_enter);
-    StackCheckStub stub;
-    __ CallStub(&stub);
-    __ jmp(&deferred_exit);
-  }
-}
-
-
-void ExitNode::Compile(MacroAssembler* masm) {
-  ASSERT(!is_marked());
-  is_marked_ = true;
-  Comment cmnt(masm, "[ ExitNode");
-  if (FLAG_trace) {
-    __ push(rax);
-    __ CallRuntime(Runtime::kTraceExit, 1);
-  }
-  __ RecordJSReturn();
-  __ movq(rsp, rbp);
-  __ pop(rbp);
-  int count = CfgGlobals::current()->fun()->scope()->num_parameters();
-  __ ret((count + 1) * kPointerSize);
-#ifdef ENABLE_DEBUGGER_SUPPORT
-  // Add padding that will be overwritten by a debugger breakpoint.
-  // "movq rsp, rbp; pop rbp" has length 4.  "ret k" has length 3.
-  const int kPadding = Debug::kX64JSReturnSequenceLength - 4 - 3;
-  for (int i = 0; i < kPadding; ++i) {
-    __ int3();
-  }
-#endif
-}
-
-
-void PropLoadInstr::Compile(MacroAssembler* masm) {
-  // The key should not be on the stack---if it is a compiler-generated
-  // temporary it is in the accumulator.
-  ASSERT(!key()->is_on_stack());
-
-  Comment cmnt(masm, "[ Load from Property");
-  // If the key is known at compile-time we may be able to use a load IC.
-  bool is_keyed_load = true;
-  if (key()->is_constant()) {
-    // Still use the keyed load IC if the key can be parsed as an integer so
-    // we will get into the case that handles [] on string objects.
-    Handle<Object> key_val = Constant::cast(key())->handle();
-    uint32_t ignored;
-    if (key_val->IsSymbol() &&
-        !String::cast(*key_val)->AsArrayIndex(&ignored)) {
-      is_keyed_load = false;
-    }
-  }
-
-  if (!object()->is_on_stack()) object()->Push(masm);
-  // A test rax instruction after the call indicates to the IC code that it
-  // was inlined.  Ensure there is not one after the call below.
-  if (is_keyed_load) {
-    key()->Push(masm);
-    Handle<Code> ic(Builtins::builtin(Builtins::KeyedLoadIC_Initialize));
-    __ Call(ic, RelocInfo::CODE_TARGET);
-    __ pop(rbx);  // Discard key.
-  } else {
-    key()->Get(masm, rcx);
-    Handle<Code> ic(Builtins::builtin(Builtins::LoadIC_Initialize));
-    __ Call(ic, RelocInfo::CODE_TARGET);
-  }
-  __ pop(rbx);  // Discard receiver.
-  location()->Set(masm, rax);
-}
-
-
-void BinaryOpInstr::Compile(MacroAssembler* masm) {
-  // The right-hand value should not be on the stack---if it is a
-  // compiler-generated temporary it is in the accumulator.
-  ASSERT(!right()->is_on_stack());
-
-  Comment cmnt(masm, "[ BinaryOpInstr");
-  // We can overwrite one of the operands if it is a temporary.
-  OverwriteMode mode = NO_OVERWRITE;
-  if (left()->is_temporary()) {
-    mode = OVERWRITE_LEFT;
-  } else if (right()->is_temporary()) {
-    mode = OVERWRITE_RIGHT;
-  }
-
-  // Push both operands and call the specialized stub.
-  if (!left()->is_on_stack()) left()->Push(masm);
-  right()->Push(masm);
-  GenericBinaryOpStub stub(op(), mode, SMI_CODE_IN_STUB);
-  __ CallStub(&stub);
-  location()->Set(masm, rax);
-}
-
-
-void ReturnInstr::Compile(MacroAssembler* masm) {
-  // The location should be 'Effect'.  As a side effect, move the value to
-  // the accumulator.
-  Comment cmnt(masm, "[ ReturnInstr");
-  value()->Get(masm, rax);
-}
-
-
-void Constant::Get(MacroAssembler* masm, Register reg) {
-  __ Move(reg, handle_);
-}
-
-
-void Constant::Push(MacroAssembler* masm) {
-  __ Push(handle_);
-}
-
-
-static Operand ToOperand(SlotLocation* loc) {
-  switch (loc->type()) {
-    case Slot::PARAMETER: {
-      int count = CfgGlobals::current()->fun()->scope()->num_parameters();
-      return Operand(rbp, (1 + count - loc->index()) * kPointerSize);
-    }
-    case Slot::LOCAL: {
-      const int kOffset = JavaScriptFrameConstants::kLocal0Offset;
-      return Operand(rbp, kOffset - loc->index() * kPointerSize);
-    }
-    default:
-      UNREACHABLE();
-      return Operand(rax, 0);
-  }
-}
-
-
-void Constant::MoveToSlot(MacroAssembler* masm, SlotLocation* loc) {
-  __ Move(ToOperand(loc), handle_);
-}
-
-
-void SlotLocation::Get(MacroAssembler* masm, Register reg) {
-  __ movq(reg, ToOperand(this));
-}
-
-
-void SlotLocation::Set(MacroAssembler* masm, Register reg) {
-  __ movq(ToOperand(this), reg);
-}
-
-
-void SlotLocation::Push(MacroAssembler* masm) {
-  __ push(ToOperand(this));
-}
-
-
-void SlotLocation::Move(MacroAssembler* masm, Value* value) {
-  // We dispatch to the value because in some cases (temp or constant) we
-  // can use special instruction sequences.
-  value->MoveToSlot(masm, this);
-}
-
-
-void SlotLocation::MoveToSlot(MacroAssembler* masm, SlotLocation* loc) {
-  __ movq(kScratchRegister, ToOperand(this));
-  __ movq(ToOperand(loc), kScratchRegister);
-}
-
-
-void TempLocation::Get(MacroAssembler* masm, Register reg) {
-  switch (where_) {
-    case ACCUMULATOR:
-      if (!reg.is(rax)) __ movq(reg, rax);
-      break;
-    case STACK:
-      __ pop(reg);
-      break;
-    case NOT_ALLOCATED:
-      UNREACHABLE();
-  }
-}
-
-
-void TempLocation::Set(MacroAssembler* masm, Register reg) {
-  switch (where_) {
-    case ACCUMULATOR:
-      if (!reg.is(rax)) __ movq(rax, reg);
-      break;
-    case STACK:
-      __ push(reg);
-      break;
-    case NOT_ALLOCATED:
-      UNREACHABLE();
-  }
-}
-
-
-void TempLocation::Push(MacroAssembler* masm) {
-  switch (where_) {
-    case ACCUMULATOR:
-      __ push(rax);
-      break;
-    case STACK:
-    case NOT_ALLOCATED:
-      UNREACHABLE();
-  }
-}
-
-
-void TempLocation::Move(MacroAssembler* masm, Value* value) {
-  switch (where_) {
-    case ACCUMULATOR:
-      value->Get(masm, rax);
-      break;
-    case STACK:
-      value->Push(masm);
-      break;
-    case NOT_ALLOCATED:
-      UNREACHABLE();
-  }
-}
-
-
-void TempLocation::MoveToSlot(MacroAssembler* masm, SlotLocation* loc) {
-  switch (where_) {
-    case ACCUMULATOR:
-      __ movq(ToOperand(loc), rax);
-      break;
-    case STACK:
-      __ pop(ToOperand(loc));
-      break;
-    case NOT_ALLOCATED:
-      UNREACHABLE();
-  }
-}
-
-
-#undef __
-
-} }  // namespace v8::internal