Remove some dead code.

src/arm/jump-target-arm.cc

-// Copyright 2008 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_ARM)
-
-#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 (entry_frame_set_) {
-    if (entry_label_.is_bound()) {
-      // If we already bound and generated code at the destination then it
-      // is too late to ask for less optimistic type assumptions.
-      ASSERT(entry_frame_.IsCompatibleWith(cgen()->frame()));
-    }
-    // There already a frame expectation at the target.
-    cgen()->frame()->MergeTo(&entry_frame_);
-    cgen()->DeleteFrame();
-  } else {
-    // Clone the current frame to use as the expected one at the target.
-    set_entry_frame(cgen()->frame());
-    // Zap the fall-through frame since the jump was unconditional.
-    RegisterFile empty;
-    cgen()->SetFrame(NULL, &empty);
-  }
-  if (entry_label_.is_bound()) {
-    // You can't jump backwards to an already bound label unless you admitted
-    // up front that this was a bidirectional jump target.  Bidirectional jump
-    // targets will zap their type info when bound in case some later virtual
-    // frame with less precise type info branches to them.
-    ASSERT(direction_ != FORWARD_ONLY);
-  }
-  __ jmp(&entry_label_);
-}
-
-
-void JumpTarget::DoBranch(Condition cond, Hint ignored) {
-  ASSERT(cgen()->has_valid_frame());
-
-  if (entry_frame_set_) {
-    if (entry_label_.is_bound()) {
-      // If we already bound and generated code at the destination then it
-      // is too late to ask for less optimistic type assumptions.
-      ASSERT(entry_frame_.IsCompatibleWith(cgen()->frame()));
-    }
-    // We have an expected frame to merge to on the backward edge.
-    cgen()->frame()->MergeTo(&entry_frame_, cond);
-  } else {
-    // Clone the current frame to use as the expected one at the target.
-    set_entry_frame(cgen()->frame());
-  }
-  if (entry_label_.is_bound()) {
-    // You can't branch backwards to an already bound label unless you admitted
-    // up front that this was a bidirectional jump target.  Bidirectional jump
-    // targets will zap their type info when bound in case some later virtual
-    // frame with less precise type info branches to them.
-    ASSERT(direction_ != FORWARD_ONLY);
-  }
-  __ b(cond, &entry_label_);
-  if (cond == al) {
-    cgen()->DeleteFrame();
-  }
-}
-
-
-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()->has_valid_frame());
-  // There are no non-frame references across the call.
-  ASSERT(cgen()->HasValidEntryRegisters());
-  ASSERT(!is_linked());
-
-  // Calls are always 'forward' so we use a copy of the current frame (plus
-  // one for a return address) as the expected frame.
-  ASSERT(!entry_frame_set_);
-  VirtualFrame target_frame = *cgen()->frame();
-  target_frame.Adjust(1);
-  set_entry_frame(&target_frame);
-
-  __ bl(&entry_label_);
-}
-
-
-void JumpTarget::DoBind() {
-  ASSERT(!is_bound());
-
-  // Live non-frame registers are not allowed at the start of a basic
-  // block.
-  ASSERT(!cgen()->has_valid_frame() || cgen()->HasValidEntryRegisters());
-
-  if (cgen()->has_valid_frame()) {
-    if (direction_ != FORWARD_ONLY) cgen()->frame()->ForgetTypeInfo();
-    // If there is a current frame we can use it on the fall through.
-    if (!entry_frame_set_) {
-      entry_frame_ = *cgen()->frame();
-      entry_frame_set_ = true;
-    } else {
-      cgen()->frame()->MergeTo(&entry_frame_);
-      // On fall through we may have to merge both ways.
-      if (direction_ != FORWARD_ONLY) {
-        // This will not need to adjust the virtual frame entries that are
-        // register allocated since that was done above and they now match.
-        // But it does need to adjust the entry_frame_ of this jump target
-        // to make it potentially less optimistic.  Later code can branch back
-        // to this jump target and we need to assert that that code does not
-        // have weaker assumptions about types.
-        entry_frame_.MergeTo(cgen()->frame());
-      }
-    }
-  } else {
-    // If there is no current frame we must have an entry frame which we can
-    // copy.
-    ASSERT(entry_frame_set_);
-    RegisterFile empty;
-    cgen()->SetFrame(new VirtualFrame(&entry_frame_), &empty);
-  }
-
-  __ bind(&entry_label_);
-}
-
-
-#undef __
-
-
-} }  // namespace v8::internal
-
-#endif  // V8_TARGET_ARCH_ARM