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/*******************************************************************************
* Copyright (c) 2000, 2007 QNX Software Systems and others.
* All rights reserved. This program and the accompanying materials
* are made available under the terms of the Eclipse Public License v1.0
* which accompanies this distribution, and is available at
* http://www.eclipse.org/legal/epl-v10.html
*
* Contributors:
* QNX Software Systems - Initial API and implementation
* Ericsson AB - Modified for new DSF Reference Implementation
* Ericsson AB - Reverted to byte[] and processed multi-line results
*******************************************************************************/
package org.eclipse.cdt.dsf.mi.service.command.output;
import java.math.BigInteger;
import org.eclipse.debug.core.model.MemoryByte;
/**
*
* -data-read-memory result
*
* (gdb)
* nn-data-read-memory [command parameters]
* nn^done,addr="ADDRESS",nr-bytes="NR_BYTES",total-bytes="TOTAL_BYTES",
* next-row="NEXT_ROW",prev-row="PREV_ROW",next-page="NEXT_PAGE",
* prev-page="PREV_PAGE",memory=[
* {addr="addr1",data=["0x00","0x01", ...]},
* {addr="addr2",data=["0x02","0x03", ...]},
* {addr="addr3",data=["0x04","0x05", ...]},
* ...]
* (gdb)
*
* where:
*
* 'ADDRESS'
* Address (in hex) of the first byte fetched.
*
* 'NR_BYTES'
* Number of bytes read.
*
* 'TOTAL_BYTES'
* Number of bytes requested (nr-rows * nr-columns * word-size).
*
* 'NEXT_ROW'
* Address (in hex) of the next row.
*
* 'PREV_ROW'
* Address (in hex) of the previous row.
*
* 'NEXT_PAGE'
* Address (in hex) of the next page.
*
* 'PREV_PAGE'
* Address (in hex) of the previous page.
*
* 'MEMORY'
* Memory bytes retrieved, nr-rows of nr-columns words.
*
*/
public class MIDataReadMemoryInfo extends MIInfo {
// The parsed values of interest
BigInteger fAddress = new BigInteger("0"); //$NON-NLS-1$
int fBytesRead;
int fBytesRequested;
MemoryByte[] fMemoryBlock;
/**
* Constructor
*
* @param output
*/
public MIDataReadMemoryInfo(MIOutput output) {
super(output);
fMemoryBlock = new MemoryByte[0];
if (isDone()) {
parseResult(1);
}
}
/**
* Constructor
*
* @param output
*/
public MIDataReadMemoryInfo(MIOutput output, int word_size) {
super(output);
fMemoryBlock = new MemoryByte[0];
if (isDone()) {
parseResult(word_size);
}
}
/**
* Parse the back-end-result. The result is an array of the following form:
*
* [0] addr="address"
* [1] nr-bytes="x"
* [2] total-bytes="y"
* [3] next-row="address2"
* [4] prev-row="address3"
* [5] next-page="address4"
* [6] prev-page="address5"
* [7] memory=[{addr="addr1",data=["0x00","0x01",...]}]
*
* At this point, we only have interest in "memory".
*/
private void parseResult(int word_size) {
// Get the GDB/MI result record
MIOutput output = getMIOutput();
MIResultRecord record = output.getMIResultRecord();
// Parse the result record
if (record != null) {
// Parse the output results
// Note: we assume that the result respects the output format
// i.e. nothing missing, nothing out of order.
MIResult[] results = record.getMIResults();
for (int i = 0; i < results.length; i++) {
// Get the variable name
String var = results[i].getVariable();
// Parse 'addr="address"', the address of the first byte to read
if (var.equals("addr")) { //$NON-NLS-1$
MIValue value = results[i].getMIValue();
if (value instanceof MIConst) {
String address = ((MIConst) value).getCString();
fAddress = new BigInteger(address.substring(2), 16); // Strip the "0x"
}
}
// Parse 'nr-bytes="x"', the number of bytes read
if (var.equals("total-bytes")) { //$NON-NLS-1$
MIValue value = results[i].getMIValue();
if (value instanceof MIConst) {
String size = ((MIConst) value).getCString();
fBytesRead = Integer.parseInt(size);
}
}
// Parse '"total-bytes="y"', the number of bytes requested
// Instantiate the corresponding output buffer with invalid bytes
if (var.equals("total-bytes")) { //$NON-NLS-1$
MIValue value = results[i].getMIValue();
if (value instanceof MIConst) {
String size = ((MIConst) value).getCString();
fBytesRequested = Integer.parseInt(size);
fMemoryBlock = new MemoryByte[fBytesRequested];
for (int j = 0; j < fMemoryBlock.length; j++)
fMemoryBlock[j] = new MemoryByte((byte) 0, (byte) 0);
}
}
// Parse 'memory=[{addr="addr1",data=["0x00","0x01",...]}]'
if (var.equals("memory")) { //$NON-NLS-1$
MIValue value = results[i].getMIValue();
if (value instanceof MIList) {
parseMemoryLines((MIList) value, word_size);
}
}
}
}
}
/**
* Parse the actual memory lines of the general form:
*
* [{addr="addr1",data=["0x00","0x01",...]}]
* [{addr="addr2",data=["0x00","0x01",...]}]
*
* Since we haven't implemented coalescing yet, we conveniently simplify
* the processing by assuming that the memory block address matches the
* one of the request. Therefore, we only have to fill the memoryBlock[]
* with the incoming bytes.
*
* This will have to be revisited as soon as we start considering
* multiple (and possibly canceled) requests.
*/
private void parseMemoryLines(MIList lines, int word_size) {
// Parse each line and append the results to the result block
MIValue[] lineValues = lines.getMIValues();
for (int i = 0; i < lineValues.length; i++) {
// Each line has 2 tuples: "addr" and "data"
if (lineValues[i] instanceof MITuple) {
MITuple tuple = (MITuple) lineValues[i];
MIResult[] results = tuple.getMIResults();
// The offset of this particular output line in the result buffer
int offset = 0;
// The 1st tuple ('addr="addr1"') gives us the address of the first byte read
MIValue addrValue = results[0].getMIValue();
if (addrValue instanceof MIConst) {
String address = ((MIConst) addrValue).getCString();
BigInteger startAddress = new BigInteger(address.substring(2), 16); // Strip the "0x"
offset = startAddress.subtract(fAddress).intValue();
}
// The 2nd tuple ("data=[...]") gives us the actual bytes
MIValue value = results[1].getMIValue();
if (value instanceof MIList) {
MIList list = (MIList) value;
MIValue[] values = list.getMIValues();
MemoryByte[] byteValues = new MemoryByte[values.length * word_size];
// Parse the result array
for (int j = 0; j < values.length; j++) {
if (values[j] instanceof MIConst) {
String str = ((MIConst) values[j]).getCString();
try {
long word = Long.decode(str.trim()).longValue();
for (int k = 0; k < word_size; k++) {
int bit_shift = (word_size - k - 1) * 8;
byteValues[j * word_size + k] = new MemoryByte((byte) ((word >> bit_shift) % 256));
}
} catch (NumberFormatException e) {
for (int k = 0; k < word_size; k++)
byteValues[j * word_size + k] = new MemoryByte((byte) -1, (byte) 0);
}
}
}
// Copy the parsed line to the memory block
System.arraycopy(byteValues, 0, fMemoryBlock, offset, byteValues.length);
}
}
}
}
/**
* Return the memory block
*/
public MemoryByte[] getMIMemoryBlock() {
return fMemoryBlock;
}
}
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