Mercurial > hg > truffle
view graal/com.oracle.graal.api.code/src/com/oracle/graal/api/code/TargetDescription.java @ 8426:182753fdaa7f
Merge.
author | Christian Humer <christian.humer@gmail.com> |
---|---|
date | Thu, 21 Mar 2013 13:13:07 +0100 |
parents | 674a8b9e62f8 |
children | 149fe42411df |
line wrap: on
line source
/* * Copyright (c) 2009, 2012, Oracle and/or its affiliates. All rights reserved. * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER. * * This code is free software; you can redistribute it and/or modify it * under the terms of the GNU General Public License version 2 only, as * published by the Free Software Foundation. * * This code is distributed in the hope that it will be useful, but WITHOUT * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License * version 2 for more details (a copy is included in the LICENSE file that * accompanied this code). * * You should have received a copy of the GNU General Public License version * 2 along with this work; if not, write to the Free Software Foundation, * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA. * * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA * or visit www.oracle.com if you need additional information or have any * questions. */ package com.oracle.graal.api.code; import com.oracle.graal.api.meta.*; /** * Represents the target machine for a compiler, including the CPU architecture, the size of * pointers and references, alignment of stacks, caches, etc. */ public class TargetDescription { public final Architecture arch; /** * Specifies if this is a multi-processor system. */ public final boolean isMP; /** * Specifies if this target supports encoding objects inline in the machine code. */ public final boolean inlineObjects; /** * The machine word size on this target. */ public final int wordSize; /** * The kind to be used for representing raw pointers and CPU registers. */ public final Kind wordKind; /** * The stack alignment requirement of the platform. For example, from Appendix D of <a * href="http://www.intel.com/Assets/PDF/manual/248966.pdf">Intel 64 and IA-32 Architectures * Optimization Reference Manual</a>: * * <pre> * "It is important to ensure that the stack frame is aligned to a * 16-byte boundary upon function entry to keep local __m128 data, * parameters, and XMM register spill locations aligned throughout * a function invocation." * </pre> */ public final int stackAlignment; /** * Maximum constant displacement at which a memory access can no longer be an implicit null * check. */ public final int implicitNullCheckLimit; public TargetDescription(Architecture arch, boolean isMP, int stackAlignment, int implicitNullCheckLimit, boolean inlineObjects) { this.arch = arch; this.isMP = isMP; this.wordSize = arch.getWordSize(); this.wordKind = Kind.fromWordSize(wordSize); this.stackAlignment = stackAlignment; this.implicitNullCheckLimit = implicitNullCheckLimit; this.inlineObjects = inlineObjects; } /** * Gets the size in bytes of the specified kind for this target. * * @param kind the kind for which to get the size * @return the size in bytes of {@code kind} */ public int sizeInBytes(Kind kind) { // Checkstyle: stop switch (kind) { case Boolean: return 1; case Byte: return 1; case Char: return 2; case Short: return 2; case Int: return 4; case Long: return 8; case Float: return 4; case Double: return 8; case Object: return wordSize; default: return 0; } // Checkstyle: resume } /** * Aligns the given frame size (without return instruction pointer) to the stack alignment size * and return the aligned size (without return instruction pointer). * * @param frameSize the initial frame size to be aligned * @return the aligned frame size */ public int alignFrameSize(int frameSize) { int x = frameSize + arch.getReturnAddressSize() + (stackAlignment - 1); return (x / stackAlignment) * stackAlignment - arch.getReturnAddressSize(); } }