Mercurial > hg > graal-jvmci-8
view agent/src/share/classes/sun/jvm/hotspot/debugger/win32/coff/COFFSymbol.java @ 642:660978a2a31a
6791178: Specialize for zero as the compressed oop vm heap base
Summary: Use zero based compressed oops if java heap is below 32gb and unscaled compressed oops if java heap is below 4gb.
Reviewed-by: never, twisti, jcoomes, coleenp
author | kvn |
---|---|
date | Thu, 12 Mar 2009 10:37:46 -0700 |
parents | a61af66fc99e |
children | c18cbe5936b8 |
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/* * Copyright 2000 Sun Microsystems, Inc. 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 Sun Microsystems, Inc., 4150 Network Circle, Santa Clara, * CA 95054 USA or visit www.sun.com if you need additional information or * have any questions. * */ package sun.jvm.hotspot.debugger.win32.coff; /** Describes a COFF symbol. (Some of the descriptions are taken directly from Microsoft's documentation and are copyrighted by Microsoft.) */ public interface COFFSymbol { /** Offset within the file of this record. (FIXME: Now that we have the auxiliary records exposed, it may not be necessary to expose this.) */ public int getOffset(); public String getName(); /** Value associated with the symbol. The interpretation of this field depends on Section Number and Storage Class. A typical meaning is the relocatable address. */ public int getValue(); /** Signed integer identifying the section, using a one-based index into the Section Table. Some values have special meaning defined in {@link sun.jvm.hotspot.debugger.win32.coff.COFFSymbolConstants}. */ public short getSectionNumber(); /** <P> The Type field of a symbol table entry contains two bytes, each byte representing type information. The least-significant byte represents simple (base) data type, and the most-significant byte represents complex type, if any: </P> <P> MSB: Complex type: none, pointer, function, array. </P> <P> LSB: Base type: integer, floating-point, etc. </P> <P> The possible base type values are listed in {@link sun.jvm.hotspot.debugger.win32.coff.COFFSymbolConstants} under the IMAGE_SYM_TYPE constants. </P> <P> The most significant byte specifies whether the symbol is a pointer to, function returning, or array of the base type specified in the least significant byte. Microsoft tools use this field only to indicate whether or not the symbol is a function, so that the only two resulting values are 0x0 and 0x20 for the Type field. However, other tools can use this field to communicate more information. </P> <P> It is very important to specify the function attribute correctly. This information is required for incremental linking to work correctly. For some architectures the information may be required for other purposes. </P> <P> The possible function types are listed in {@link sun.jvm.hotspot.debugger.win32.coff.COFFSymbolConstants} under the IMAGE_SYM_DTYPE constants. </P> */ public short getType(); /** Enumerated value representing storage class. See {@link sun.jvm.hotspot.debugger.win32.coff.COFFSymbolConstants} under the IMAGE_SYM_CLASS constants. */ public byte getStorageClass(); /** Number of auxiliary symbol table entries that follow this record. (FIXME: the APIs below which fetch such an auxiliary symbol are only currently capable of fetching the first one.) */ public byte getNumberOfAuxSymbols(); /** Indicates whether this symbol is a function definition: storage class EXTERNAL (2), a Type value indicating it is a function (0x20), and a section number greater than zero. This indicates that the function is followed by an {@link sun.jvm.hotspot.debugger.win32.coff.AuxFunctionDefinitionRecord}. Note that a symbol table record that has a section number of UNDEFINED (0) does not define the function and does not have an auxiliary record. */ public boolean isFunctionDefinition(); /** This should only be called if {@link #isFunctionDefinition} returns true. */ public AuxFunctionDefinitionRecord getAuxFunctionDefinitionRecord(); /** Indicates whether this symbol is a .bf or .ef symbol record and is therefore followed by an {@link sun.jvm.hotspot.debugger.win32.coff.AuxBfEfRecord}. */ public boolean isBfOrEfSymbol(); /** This should only be called if {@link #isBfOrEfSymbol} returns true. */ public AuxBfEfRecord getAuxBfEfRecord(); /** Indicates whether this symbol is a weak external and is therefore followed by an {@link sun.jvm.hotspot.debugger.win32.coff.AuxWeakExternalRecord}. */ public boolean isWeakExternal(); /** This should only be called if {@link #isWeakExternal} returns true. */ public AuxWeakExternalRecord getAuxWeakExternalRecord(); /** Indicates whether this symbol has storage class FILE and is therefore followed by a {@link sun.jvm.hotspot.debugger.win32.coff.AuxFileRecord}. */ public boolean isFile(); /** This should only be called if {@link #isFile} returns true. */ public AuxFileRecord getAuxFileRecord(); /** Indicates whether this symbol defines a section and is therefore followed by an {@link sun.jvm.hotspot.debugger.win32.coff.AuxSectionDefinitionsRecord}. */ public boolean isSectionDefinition(); /** This should only be called if {@link #isSectionDefinition} returns true. */ public AuxSectionDefinitionsRecord getAuxSectionDefinitionsRecord(); }