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view graal/com.oracle.max.asmdis/src/com/sun/max/asm/dis/risc/RiscDisassembler.java @ 3735:61369a06f03c
Updated authors file.
author | Thomas Wuerthinger <thomas.wuerthinger@oracle.com> |
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date | Sat, 17 Dec 2011 20:36:28 +0100 |
parents | e233f5660da4 |
children | bc8527f3071c |
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/* * Copyright (c) 2007, 2011, 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.sun.max.asm.dis.risc; import java.io.*; import java.util.*; import java.util.Arrays; import com.sun.max.*; import com.sun.max.asm.*; import com.sun.max.asm.dis.*; import com.sun.max.asm.gen.*; import com.sun.max.asm.gen.risc.*; import com.sun.max.asm.gen.risc.bitRange.*; import com.sun.max.asm.gen.risc.field.*; import com.sun.max.lang.*; import com.sun.max.program.*; /** */ public abstract class RiscDisassembler extends Disassembler { private final RiscAssembly assembly; protected RiscDisassembler(ImmediateArgument startAddress, RiscAssembly assembly, Endianness endianness, InlineDataDecoder inlineDataDecoder) { super(startAddress, endianness, inlineDataDecoder); assert assembly != null; this.assembly = assembly; this.byteFields = new ImmediateOperandField[]{createByteField(0), createByteField(1), createByteField(2), createByteField(3)}; } public RiscAssembly assembly() { return assembly; } private static final boolean INLINE_INVALID_INSTRUCTIONS_AS_BYTES = true; /** * Extract the value for each operand of a template from an encoded instruction whose opcode * matches that of the template. * * @param instruction the encoded instruction * @return the decoded arguments for each operand or null if at least one operand has * an invalid value in the encoded instruction */ private List<Argument> disassemble(int instruction, RiscTemplate template) { final List<Argument> arguments = new ArrayList<Argument>(); for (OperandField operandField : template.parameters()) { final Argument argument = operandField.disassemble(instruction); if (argument == null) { return null; } arguments.add(argument); } return arguments; } private boolean isLegalArgumentList(RiscTemplate template, List<Argument> arguments) { final List<InstructionConstraint> constraints = template.instructionDescription().constraints(); for (InstructionConstraint constraint : constraints) { if (!(constraint.check(template, arguments))) { return false; } } return true; } /** * Creates a disassembled instruction based on a given sequence of bytes, a template and a set of arguments. The * caller has performed the necessary decoding of the bytes to derive the template and arguments. * * @param position the position an instruction stream from which the bytes were read * @param bytes the bytes of an instruction * @param template the template that corresponds to the instruction encoded in {@code bytes} * @param arguments the arguments of the instruction encoded in {@code bytes} * @return a disassembled instruction representing the result of decoding {@code bytes} into an instruction */ protected abstract DisassembledInstruction createDisassembledInstruction(int position, byte[] bytes, RiscTemplate template, List<Argument> arguments); @Override public List<DisassembledObject> scanOne0(BufferedInputStream stream) throws IOException, AssemblyException { final int instruction = endianness().readInt(stream); final List<DisassembledObject> result = new LinkedList<DisassembledObject>(); final byte[] instructionBytes = endianness().toBytes(instruction); for (SpecificityGroup specificityGroup : assembly().specificityGroups()) { for (OpcodeMaskGroup opcodeMaskGroup : specificityGroup.opcodeMaskGroups()) { final int opcode = instruction & opcodeMaskGroup.mask(); for (RiscTemplate template : opcodeMaskGroup.templatesFor(opcode)) { // Skip synthetic instructions when preference is for raw instructions, // and skip instructions with a different number of arguments than requested if so (i.e. when running the AssemblyTester): if (template != null && template.isDisassemblable() && ((abstractionPreference() == AbstractionPreference.SYNTHETIC) || !template.instructionDescription().isSynthetic())) { final List<Argument> arguments = disassemble(instruction, template); if (arguments != null && (expectedNumberOfArguments() < 0 || arguments.size() == expectedNumberOfArguments())) { if (isLegalArgumentList(template, arguments)) { final Assembler assembler = createAssembler(currentPosition); try { assembly().assemble(assembler, template, arguments); final byte[] bytes = assembler.toByteArray(); if (Arrays.equals(bytes, instructionBytes)) { final DisassembledInstruction disassembledInstruction = createDisassembledInstruction(currentPosition, bytes, template, arguments); result.add(disassembledInstruction); } } catch (AssemblyException assemblyException) { ProgramWarning.message("could not assemble matching instruction: " + template); } } } } } } } if (result.isEmpty()) { if (INLINE_INVALID_INSTRUCTIONS_AS_BYTES) { stream.reset(); final InlineData inlineData = new InlineData(currentPosition, instructionBytes); final DisassembledData disassembledData = createDisassembledDataObjects(inlineData).iterator().next(); result.add(disassembledData); } else { throw new AssemblyException("instruction could not be disassembled: " + Bytes.toHexLiteral(endianness().toBytes(instruction))); } } currentPosition += 4; return result; } @Override public List<DisassembledObject> scan0(BufferedInputStream stream) throws IOException, AssemblyException { final List<DisassembledObject> result = new ArrayList<DisassembledObject>(); try { while (true) { scanInlineData(stream, result); final List<DisassembledObject> disassembledObjects = scanOne(stream); boolean foundSyntheticDisassembledInstruction = false; if (abstractionPreference() == AbstractionPreference.SYNTHETIC) { for (DisassembledObject disassembledObject : disassembledObjects) { if (disassembledObject instanceof DisassembledInstruction) { final DisassembledInstruction disassembledInstruction = (DisassembledInstruction) disassembledObject; if (disassembledInstruction.template().instructionDescription().isSynthetic()) { result.add(disassembledInstruction); foundSyntheticDisassembledInstruction = true; break; } } } } if (!foundSyntheticDisassembledInstruction) { result.add(Utils.first(disassembledObjects)); } } } catch (IOException ioException) { return result; } } protected RiscTemplate createInlineDataTemplate(InstructionDescription instructionDescription) { return new RiscTemplate(instructionDescription); } private final ImmediateOperandField[] byteFields; private ImmediateOperandField createByteField(int index) { if (assembly().bitRangeEndianness() == BitRangeOrder.ASCENDING) { final int firstBit = index * Bytes.WIDTH; final int lastBit = firstBit + 7; return ImmediateOperandField.createAscending(firstBit, lastBit); } final int lastBit = index * Bytes.WIDTH; final int firstBit = lastBit + 7; return ImmediateOperandField.createDescending(firstBit, lastBit); } @Override public ImmediateArgument addressForRelativeAddressing(DisassembledInstruction di) { return di.startAddress(); } @Override public String mnemonic(DisassembledInstruction di) { final RiscExternalInstruction instruction = new RiscExternalInstruction((RiscTemplate) di.template(), di.arguments(), di.startAddress(), null); return instruction.name(); } @Override public String operandsToString(DisassembledInstruction di, AddressMapper addressMapper) { final RiscExternalInstruction instruction = new RiscExternalInstruction((RiscTemplate) di.template(), di.arguments(), di.startAddress(), addressMapper); return instruction.operands(); } @Override public String toString(DisassembledInstruction di, AddressMapper addressMapper) { final RiscExternalInstruction instruction = new RiscExternalInstruction((RiscTemplate) di.template(), di.arguments(), di.startAddress(), addressMapper); return instruction.toString(); } }