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comparison agent/src/share/classes/sun/jvm/hotspot/debugger/DebuggerBase.java @ 642:660978a2a31a

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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 d1605aabd0a1
children bd02caa94611
comparison
equal deleted inserted replaced
641:6af0a709d52b 642:660978a2a31a
54 protected long jshortSize; 54 protected long jshortSize;
55 protected boolean javaPrimitiveTypesConfigured; 55 protected boolean javaPrimitiveTypesConfigured;
56 // heap data. 56 // heap data.
57 protected long oopSize; 57 protected long oopSize;
58 protected long heapOopSize; 58 protected long heapOopSize;
59 protected long heapBase; // heap base for compressed oops. 59 protected long narrowOopBase; // heap base for compressed oops.
60 protected long logMinObjAlignmentInBytes; // Used to decode compressed oops. 60 protected int narrowOopShift; // shift to decode compressed oops.
61 // Should be initialized if desired by calling initCache() 61 // Should be initialized if desired by calling initCache()
62 private PageCache cache; 62 private PageCache cache;
63 63
64 // State for faster accessors that don't allocate memory on each read 64 // State for faster accessors that don't allocate memory on each read
65 private boolean useFastAccessors; 65 private boolean useFastAccessors;
157 (jshortSize == 2)); 157 (jshortSize == 2));
158 158
159 javaPrimitiveTypesConfigured = true; 159 javaPrimitiveTypesConfigured = true;
160 } 160 }
161 161
162 public void putHeapConst(long heapBase, long heapOopSize, long logMinObjAlignmentInBytes) { 162 public void putHeapConst(long heapOopSize, long narrowOopBase, int narrowOopShift) {
163 this.heapBase = heapBase;
164 this.heapOopSize = heapOopSize; 163 this.heapOopSize = heapOopSize;
165 this.logMinObjAlignmentInBytes = logMinObjAlignmentInBytes; 164 this.narrowOopBase = narrowOopBase;
165 this.narrowOopShift = narrowOopShift;
166 } 166 }
167 167
168 /** May be called by subclasses if desired to initialize the page 168 /** May be called by subclasses if desired to initialize the page
169 cache but may not be overridden */ 169 cache but may not be overridden */
170 protected final void initCache(long pageSize, long maxNumPages) { 170 protected final void initCache(long pageSize, long maxNumPages) {
457 protected long readCompOopAddressValue(long address) 457 protected long readCompOopAddressValue(long address)
458 throws UnmappedAddressException, UnalignedAddressException { 458 throws UnmappedAddressException, UnalignedAddressException {
459 long value = readCInteger(address, getHeapOopSize(), true); 459 long value = readCInteger(address, getHeapOopSize(), true);
460 if (value != 0) { 460 if (value != 0) {
461 // See oop.inline.hpp decode_heap_oop 461 // See oop.inline.hpp decode_heap_oop
462 value = (long)(heapBase + (long)(value << logMinObjAlignmentInBytes)); 462 value = (long)(narrowOopBase + (long)(value << narrowOopShift));
463 } 463 }
464 return value; 464 return value;
465 } 465 }
466 466
467 protected void writeAddressValue(long address, long value) 467 protected void writeAddressValue(long address, long value)
543 543
544 public long getHeapOopSize() { 544 public long getHeapOopSize() {
545 return heapOopSize; 545 return heapOopSize;
546 } 546 }
547 547
548 public long getHeapBase() { 548 public long getNarrowOopBase() {
549 return heapBase; 549 return narrowOopBase;
550 } 550 }
551 public long getLogMinObjAlignmentInBytes() { 551 public int getNarrowOopShift() {
552 return logMinObjAlignmentInBytes; 552 return narrowOopShift;
553 } 553 }
554 } 554 }