bcab3697f6
over the frame elements to find registers used (before allocating undetermined elements) and another pass to set the frame's register indices (after allocating all elements). Review URL: http://codereview.chromium.org/114018 git-svn-id: http://v8.googlecode.com/svn/branches/bleeding_edge@1906 ce2b1a6d-e550-0410-aec6-3dcde31c8c00
137 lines
4.4 KiB
C++
137 lines
4.4 KiB
C++
// Copyright 2008 the V8 project authors. All rights reserved.
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// Redistribution and use in source and binary forms, with or without
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// modification, are permitted provided that the following conditions are
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// met:
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//
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// * Redistributions of source code must retain the above copyright
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// notice, this list of conditions and the following disclaimer.
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// * Redistributions in binary form must reproduce the above
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// copyright notice, this list of conditions and the following
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// disclaimer in the documentation and/or other materials provided
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// with the distribution.
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// * Neither the name of Google Inc. nor the names of its
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// contributors may be used to endorse or promote products derived
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// from this software without specific prior written permission.
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//
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// THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
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// "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
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// LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
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// A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
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// OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
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// SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
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// LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
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// DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
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// THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
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// (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
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// OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
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#include "v8.h"
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#include "codegen-inl.h"
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#include "register-allocator-inl.h"
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namespace v8 { namespace internal {
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// -------------------------------------------------------------------------
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// Result implementation.
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void Result::ToRegister() {
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ASSERT(is_valid());
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if (is_constant()) {
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Result fresh = cgen_->allocator()->Allocate();
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ASSERT(fresh.is_valid());
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if (cgen_->IsUnsafeSmi(handle())) {
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cgen_->LoadUnsafeSmi(fresh.reg(), handle());
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} else {
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cgen_->masm()->Set(fresh.reg(), Immediate(handle()));
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}
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// This result becomes a copy of the fresh one.
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*this = fresh;
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}
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ASSERT(is_register());
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}
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void Result::ToRegister(Register target) {
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ASSERT(is_valid());
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if (!is_register() || !reg().is(target)) {
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Result fresh = cgen_->allocator()->Allocate(target);
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ASSERT(fresh.is_valid());
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if (is_register()) {
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cgen_->masm()->mov(fresh.reg(), reg());
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} else {
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ASSERT(is_constant());
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if (cgen_->IsUnsafeSmi(handle())) {
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cgen_->LoadUnsafeSmi(fresh.reg(), handle());
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} else {
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cgen_->masm()->Set(fresh.reg(), Immediate(handle()));
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}
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}
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*this = fresh;
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} else if (is_register() && reg().is(target)) {
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ASSERT(cgen_->has_valid_frame());
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cgen_->frame()->Spill(target);
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ASSERT(cgen_->allocator()->count(target) == 1);
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}
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ASSERT(is_register());
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ASSERT(reg().is(target));
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}
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// -------------------------------------------------------------------------
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// RegisterAllocator implementation.
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RegisterFile RegisterAllocator::Reserved() {
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RegisterFile reserved;
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reserved.Use(esp);
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reserved.Use(ebp);
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reserved.Use(esi);
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return reserved;
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}
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void RegisterAllocator::UnuseReserved(RegisterFile* register_file) {
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register_file->ref_counts_[esp.code()] = 0;
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register_file->ref_counts_[ebp.code()] = 0;
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register_file->ref_counts_[esi.code()] = 0;
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}
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bool RegisterAllocator::IsReserved(int reg_code) {
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// Test below relies on the order of register codes.
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return reg_code >= esp.code() && reg_code <= esi.code();
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}
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void RegisterAllocator::Initialize() {
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Reset();
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// The following register is live on function entry, saved in the
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// frame, and available for allocation during execution.
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Use(edi); // JS function.
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}
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void RegisterAllocator::Reset() {
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registers_.Reset();
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// The following registers are live on function entry and reserved
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// during execution.
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Use(esp); // Stack pointer.
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Use(ebp); // Frame pointer (caller's frame pointer on entry).
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Use(esi); // Context (callee's context on entry).
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}
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Result RegisterAllocator::AllocateByteRegisterWithoutSpilling() {
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Result result = AllocateWithoutSpilling();
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// Check that the register is a byte register. If not, unuse the
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// register if valid and return an invalid result.
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if (result.is_valid() && !result.reg().is_byte_register()) {
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result.Unuse();
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return Result(cgen_);
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}
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return result;
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}
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} } // namespace v8::internal
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