Remove some dead code.

src/x64/jump-target-x64.cc

Index: src/x64/jump-target-x64.cc
diff --git a/src/x64/jump-target-x64.cc b/src/x64/jump-target-x64.cc
deleted file mode 100644
index e7156046322b125fa9fdbc1aea2df1987c2afdce..0000000000000000000000000000000000000000
--- a/src/x64/jump-target-x64.cc
+++ /dev/null
@@ -1,437 +0,0 @@
-// Copyright 2010 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"
-
-#if defined(V8_TARGET_ARCH_X64)
-
-#include "codegen-inl.h"
-#include "jump-target-inl.h"
-#include "register-allocator-inl.h"
-#include "virtual-frame-inl.h"
-
-namespace v8 {
-namespace internal {
-
-// -------------------------------------------------------------------------
-// JumpTarget implementation.
-
-#define __ ACCESS_MASM(cgen()->masm())
-
-void JumpTarget::DoJump() {
-  ASSERT(cgen()->has_valid_frame());
-  // Live non-frame registers are not allowed at unconditional jumps
-  // because we have no way of invalidating the corresponding results
-  // which are still live in the C++ code.
-  ASSERT(cgen()->HasValidEntryRegisters());
-
-  if (is_bound()) {
-    // Backward jump.  There is an expected frame to merge to.
-    ASSERT(direction_ == BIDIRECTIONAL);
-    cgen()->frame()->PrepareMergeTo(entry_frame_);
-    cgen()->frame()->MergeTo(entry_frame_);
-    cgen()->DeleteFrame();
-    __ jmp(&entry_label_);
-  } else if (entry_frame_ != NULL) {
-    // Forward jump with a preconfigured entry frame.  Assert the
-    // current frame matches the expected one and jump to the block.
-    ASSERT(cgen()->frame()->Equals(entry_frame_));
-    cgen()->DeleteFrame();
-    __ jmp(&entry_label_);
-  } else {
-    // Forward jump.  Remember the current frame and emit a jump to
-    // its merge code.
-    AddReachingFrame(cgen()->frame());
-    RegisterFile empty;
-    cgen()->SetFrame(NULL, &empty);
-    __ jmp(&merge_labels_.last());
-  }
-}
-
-
-void JumpTarget::DoBranch(Condition cc, Hint b) {
-  ASSERT(cgen() != NULL);
-  ASSERT(cgen()->has_valid_frame());
-
-  if (is_bound()) {
-    ASSERT(direction_ == BIDIRECTIONAL);
-    // Backward branch.  We have an expected frame to merge to on the
-    // backward edge.
-
-    // Swap the current frame for a copy (we do the swapping to get
-    // the off-frame registers off the fall through) to use for the
-    // branch.
-    VirtualFrame* fall_through_frame = cgen()->frame();
-    VirtualFrame* branch_frame = new VirtualFrame(fall_through_frame);
-    RegisterFile non_frame_registers;
-    cgen()->SetFrame(branch_frame, &non_frame_registers);
-
-    // Check if we can avoid merge code.
-    cgen()->frame()->PrepareMergeTo(entry_frame_);
-    if (cgen()->frame()->Equals(entry_frame_)) {
-      // Branch right in to the block.
-      cgen()->DeleteFrame();
-      __ j(cc, &entry_label_);
-      cgen()->SetFrame(fall_through_frame, &non_frame_registers);
-      return;
-    }
-
-    // Check if we can reuse existing merge code.
-    for (int i = 0; i < reaching_frames_.length(); i++) {
-      if (reaching_frames_[i] != NULL &&
-          cgen()->frame()->Equals(reaching_frames_[i])) {
-        // Branch to the merge code.
-        cgen()->DeleteFrame();
-        __ j(cc, &merge_labels_[i]);
-        cgen()->SetFrame(fall_through_frame, &non_frame_registers);
-        return;
-      }
-    }
-
-    // To emit the merge code here, we negate the condition and branch
-    // around the merge code on the fall through path.
-    Label original_fall_through;
-    __ j(NegateCondition(cc), &original_fall_through);
-    cgen()->frame()->MergeTo(entry_frame_);
-    cgen()->DeleteFrame();
-    __ jmp(&entry_label_);
-    cgen()->SetFrame(fall_through_frame, &non_frame_registers);
-    __ bind(&original_fall_through);
-
-  } else if (entry_frame_ != NULL) {
-    // Forward branch with a preconfigured entry frame.  Assert the
-    // current frame matches the expected one and branch to the block.
-    ASSERT(cgen()->frame()->Equals(entry_frame_));
-    // Explicitly use the macro assembler instead of __ as forward
-    // branches are expected to be a fixed size (no inserted
-    // coverage-checking instructions please).  This is used in
-    // Reference::GetValue.
-    cgen()->masm()->j(cc, &entry_label_);
-
-  } else {
-    // Forward branch.  A copy of the current frame is remembered and
-    // a branch to the merge code is emitted.  Explicitly use the
-    // macro assembler instead of __ as forward branches are expected
-    // to be a fixed size (no inserted coverage-checking instructions
-    // please).  This is used in Reference::GetValue.
-    AddReachingFrame(new VirtualFrame(cgen()->frame()));
-    cgen()->masm()->j(cc, &merge_labels_.last());
-  }
-}
-
-
-void JumpTarget::Call() {
-  // Call is used to push the address of the catch block on the stack as
-  // a return address when compiling try/catch and try/finally.  We
-  // fully spill the frame before making the call.  The expected frame
-  // at the label (which should be the only one) is the spilled current
-  // frame plus an in-memory return address.  The "fall-through" frame
-  // at the return site is the spilled current frame.
-  ASSERT(cgen() != NULL);
-  ASSERT(cgen()->has_valid_frame());
-  // There are no non-frame references across the call.
-  ASSERT(cgen()->HasValidEntryRegisters());
-  ASSERT(!is_linked());
-
-  cgen()->frame()->SpillAll();
-  VirtualFrame* target_frame = new VirtualFrame(cgen()->frame());
-  target_frame->Adjust(1);
-  // We do not expect a call with a preconfigured entry frame.
-  ASSERT(entry_frame_ == NULL);
-  AddReachingFrame(target_frame);
-  __ call(&merge_labels_.last());
-}
-
-
-void JumpTarget::DoBind() {
-  ASSERT(cgen() != NULL);
-  ASSERT(!is_bound());
-
-  // Live non-frame registers are not allowed at the start of a basic
-  // block.
-  ASSERT(!cgen()->has_valid_frame() || cgen()->HasValidEntryRegisters());
-
-  // Fast case: the jump target was manually configured with an entry
-  // frame to use.
-  if (entry_frame_ != NULL) {
-    // Assert no reaching frames to deal with.
-    ASSERT(reaching_frames_.is_empty());
-    ASSERT(!cgen()->has_valid_frame());
-
-    RegisterFile empty;
-    if (direction_ == BIDIRECTIONAL) {
-      // Copy the entry frame so the original can be used for a
-      // possible backward jump.
-      cgen()->SetFrame(new VirtualFrame(entry_frame_), &empty);
-    } else {
-      // Take ownership of the entry frame.
-      cgen()->SetFrame(entry_frame_, &empty);
-      entry_frame_ = NULL;
-    }
-    __ bind(&entry_label_);
-    return;
-  }
-
-  if (!is_linked()) {
-    ASSERT(cgen()->has_valid_frame());
-    if (direction_ == FORWARD_ONLY) {
-      // Fast case: no forward jumps and no possible backward jumps.
-      // The stack pointer can be floating above the top of the
-      // virtual frame before the bind.  Afterward, it should not.
-      VirtualFrame* frame = cgen()->frame();
-      int difference = frame->stack_pointer_ - (frame->element_count() - 1);
-      if (difference > 0) {
-        frame->stack_pointer_ -= difference;
-        __ addq(rsp, Immediate(difference * kPointerSize));
-      }
-    } else {
-      ASSERT(direction_ == BIDIRECTIONAL);
-      // Fast case: no forward jumps, possible backward ones.  Remove
-      // constants and copies above the watermark on the fall-through
-      // frame and use it as the entry frame.
-      cgen()->frame()->MakeMergable();
-      entry_frame_ = new VirtualFrame(cgen()->frame());
-    }
-    __ bind(&entry_label_);
-    return;
-  }
-
-  if (direction_ == FORWARD_ONLY &&
-      !cgen()->has_valid_frame() &&
-      reaching_frames_.length() == 1) {
-    // Fast case: no fall-through, a single forward jump, and no
-    // possible backward jumps.  Pick up the only reaching frame, take
-    // ownership of it, and use it for the block about to be emitted.
-    VirtualFrame* frame = reaching_frames_[0];
-    RegisterFile empty;
-    cgen()->SetFrame(frame, &empty);
-    reaching_frames_[0] = NULL;
-    __ bind(&merge_labels_[0]);
-
-    // The stack pointer can be floating above the top of the
-    // virtual frame before the bind.  Afterward, it should not.
-    int difference = frame->stack_pointer_ - (frame->element_count() - 1);
-    if (difference > 0) {
-      frame->stack_pointer_ -= difference;
-      __ addq(rsp, Immediate(difference * kPointerSize));
-    }
-
-    __ bind(&entry_label_);
-    return;
-  }
-
-  // If there is a current frame, record it as the fall-through.  It
-  // is owned by the reaching frames for now.
-  bool had_fall_through = false;
-  if (cgen()->has_valid_frame()) {
-    had_fall_through = true;
-    AddReachingFrame(cgen()->frame());  // Return value ignored.
-    RegisterFile empty;
-    cgen()->SetFrame(NULL, &empty);
-  }
-
-  // Compute the frame to use for entry to the block.
-  ComputeEntryFrame();
-
-  // Some moves required to merge to an expected frame require purely
-  // frame state changes, and do not require any code generation.
-  // Perform those first to increase the possibility of finding equal
-  // frames below.
-  for (int i = 0; i < reaching_frames_.length(); i++) {
-    if (reaching_frames_[i] != NULL) {
-      reaching_frames_[i]->PrepareMergeTo(entry_frame_);
-    }
-  }
-
-  if (is_linked()) {
-    // There were forward jumps.  Handle merging the reaching frames
-    // to the entry frame.
-
-    // Loop over the (non-null) reaching frames and process any that
-    // need merge code.  Iterate backwards through the list to handle
-    // the fall-through frame first.  Set frames that will be
-    // processed after 'i' to NULL if we want to avoid processing
-    // them.
-    for (int i = reaching_frames_.length() - 1; i >= 0; i--) {
-      VirtualFrame* frame = reaching_frames_[i];
-
-      if (frame != NULL) {
-        // Does the frame (probably) need merge code?
-        if (!frame->Equals(entry_frame_)) {
-          // We could have a valid frame as the fall through to the
-          // binding site or as the fall through from a previous merge
-          // code block.  Jump around the code we are about to
-          // generate.
-          if (cgen()->has_valid_frame()) {
-            cgen()->DeleteFrame();
-            __ jmp(&entry_label_);
-          }
-          // Pick up the frame for this block.  Assume ownership if
-          // there cannot be backward jumps.
-          RegisterFile empty;
-          if (direction_ == BIDIRECTIONAL) {
-            cgen()->SetFrame(new VirtualFrame(frame), &empty);
-          } else {
-            cgen()->SetFrame(frame, &empty);
-            reaching_frames_[i] = NULL;
-          }
-          __ bind(&merge_labels_[i]);
-
-          // Loop over the remaining (non-null) reaching frames,
-          // looking for any that can share merge code with this one.
-          for (int j = 0; j < i; j++) {
-            VirtualFrame* other = reaching_frames_[j];
-            if (other != NULL && other->Equals(cgen()->frame())) {
-              // Set the reaching frame element to null to avoid
-              // processing it later, and then bind its entry label.
-              reaching_frames_[j] = NULL;
-              __ bind(&merge_labels_[j]);
-            }
-          }
-
-          // Emit the merge code.
-          cgen()->frame()->MergeTo(entry_frame_);
-        } else if (i == reaching_frames_.length() - 1 && had_fall_through) {
-          // If this is the fall through frame, and it didn't need
-          // merge code, we need to pick up the frame so we can jump
-          // around subsequent merge blocks if necessary.
-          RegisterFile empty;
-          cgen()->SetFrame(frame, &empty);
-          reaching_frames_[i] = NULL;
-        }
-      }
-    }
-
-    // The code generator may not have a current frame if there was no
-    // fall through and none of the reaching frames needed merging.
-    // In that case, clone the entry frame as the current frame.
-    if (!cgen()->has_valid_frame()) {
-      RegisterFile empty;
-      cgen()->SetFrame(new VirtualFrame(entry_frame_), &empty);
-    }
-
-    // There may be unprocessed reaching frames that did not need
-    // merge code.  They will have unbound merge labels.  Bind their
-    // merge labels to be the same as the entry label and deallocate
-    // them.
-    for (int i = 0; i < reaching_frames_.length(); i++) {
-      if (!merge_labels_[i].is_bound()) {
-        reaching_frames_[i] = NULL;
-        __ bind(&merge_labels_[i]);
-      }
-    }
-
-    // There are non-NULL reaching frames with bound labels for each
-    // merge block, but only on backward targets.
-  } else {
-    // There were no forward jumps.  There must be a current frame and
-    // this must be a bidirectional target.
-    ASSERT(reaching_frames_.length() == 1);
-    ASSERT(reaching_frames_[0] != NULL);
-    ASSERT(direction_ == BIDIRECTIONAL);
-
-    // Use a copy of the reaching frame so the original can be saved
-    // for possible reuse as a backward merge block.
-    RegisterFile empty;
-    cgen()->SetFrame(new VirtualFrame(reaching_frames_[0]), &empty);
-    __ bind(&merge_labels_[0]);
-    cgen()->frame()->MergeTo(entry_frame_);
-  }
-
-  __ bind(&entry_label_);
-}
-
-
-void BreakTarget::Jump() {
-  // Drop leftover statement state from the frame before merging, without
-  // emitting code.
-  ASSERT(cgen()->has_valid_frame());
-  int count = cgen()->frame()->height() - expected_height_;
-  cgen()->frame()->ForgetElements(count);
-  DoJump();
-}
-
-
-void BreakTarget::Jump(Result* arg) {
-  // Drop leftover statement state from the frame before merging, without
-  // emitting code.
-  ASSERT(cgen()->has_valid_frame());
-  int count = cgen()->frame()->height() - expected_height_;
-  cgen()->frame()->ForgetElements(count);
-  cgen()->frame()->Push(arg);
-  DoJump();
-}
-
-
-void BreakTarget::Bind() {
-#ifdef DEBUG
-  // All the forward-reaching frames should have been adjusted at the
-  // jumps to this target.
-  for (int i = 0; i < reaching_frames_.length(); i++) {
-    ASSERT(reaching_frames_[i] == NULL ||
-           reaching_frames_[i]->height() == expected_height_);
-  }
-#endif
-  // Drop leftover statement state from the frame before merging, even on
-  // the fall through.  This is so we can bind the return target with state
-  // on the frame.
-  if (cgen()->has_valid_frame()) {
-    int count = cgen()->frame()->height() - expected_height_;
-    cgen()->frame()->ForgetElements(count);
-  }
-  DoBind();
-}
-
-
-void BreakTarget::Bind(Result* arg) {
-#ifdef DEBUG
-  // All the forward-reaching frames should have been adjusted at the
-  // jumps to this target.
-  for (int i = 0; i < reaching_frames_.length(); i++) {
-    ASSERT(reaching_frames_[i] == NULL ||
-           reaching_frames_[i]->height() == expected_height_ + 1);
-  }
-#endif
-  // Drop leftover statement state from the frame before merging, even on
-  // the fall through.  This is so we can bind the return target with state
-  // on the frame.
-  if (cgen()->has_valid_frame()) {
-    int count = cgen()->frame()->height() - expected_height_;
-    cgen()->frame()->ForgetElements(count);
-    cgen()->frame()->Push(arg);
-  }
-  DoBind();
-  *arg = cgen()->frame()->Pop();
-}
-
-
-#undef __
-
-
-} }  // namespace v8::internal
-
-#endif  // V8_TARGET_ARCH_X64