bsimmers
63 linhas
2.0 KiB
C++
63 linhas
2.0 KiB
C++
/*
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+----------------------------------------------------------------------+
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| HipHop for PHP |
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+----------------------------------------------------------------------+
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| Copyright (c) 2010- Facebook, Inc. (http://www.facebook.com) |
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+----------------------------------------------------------------------+
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| This source file is subject to version 3.01 of the PHP license, |
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| that is bundled with this package in the file LICENSE, and is |
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| available through the world-wide-web at the following url: |
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| http://www.php.net/license/3_01.txt |
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| If you did not receive a copy of the PHP license and are unable to |
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| obtain it through the world-wide-web, please send a note to |
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| license@php.net so we can mail you a copy immediately. |
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+----------------------------------------------------------------------+
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*/
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#include "hphp/runtime/vm/jit/physreg.h"
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namespace HPHP { namespace Transl {
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PhysRegSaverParity::PhysRegSaverParity(int parity, X64Assembler& as,
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RegSet regs)
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: m_as(as)
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, m_regs(regs)
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, m_adjust((parity & 0x1) == (regs.size() & 0x1) ? 8 : 0)
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{
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m_regs.forEach([&] (PhysReg pr) {
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m_as. push (pr);
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});
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if (m_adjust) {
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// Maintain stack evenness for SIMD compatibility.
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m_as. subq (m_adjust, reg::rsp);
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}
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}
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PhysRegSaverParity::~PhysRegSaverParity() {
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if (m_adjust) {
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// See above; stack parity.
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m_as. addq (m_adjust, reg::rsp);
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}
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emitPops(m_as, m_regs);
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}
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void PhysRegSaverParity::emitPops(X64Assembler& as, RegSet regs) {
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regs.forEachR([&] (PhysReg pr) {
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as. pop (pr);
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});
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}
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int PhysRegSaverParity::rspAdjustment() const {
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return m_adjust;
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}
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int PhysRegSaverParity::rspTotalAdjustmentRegs() const {
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return m_regs.size() + m_adjust / sizeof(int64_t);
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}
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void PhysRegSaverParity::bytesPushed(int64_t bytes) {
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m_adjust += bytes;
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}
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} }
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