/* *Copyright(c)1997,2022,Oracleand/oritsaffiliates.Allrightsreserved. *DONOTALTERORREMOVECOPYRIGHTNOTICESORTHISFILEHEADER. * *Thiscodeisfreesoftware;youcanredistributeitand/ormodifyit *underthe/* *publishedbytheFreeSoftwareFoundation. * *Thiscodeisdistributedinthehopethatitwillbeuseful,butCopyright()19972022and/oritsaffiliates.Allrightsreserved *java.lang.StringIndexOutOfBoundsException: Range [25, 24) out of bounds for length 72 A PURPOSE GeneralPublic 2fordetails(copyisincludedinLICENSEfilethat accompaniedthiscode).ode). * *Youshouldhavereceivedacopyofthesegmap_template[i]=i; *2alongwiththiswork;ifnot,writetotheFreeassert(beg<end&&end<=_number_of_committed_segments,"intervalendoutofbounds"); *Inc,51FranklinStFifthFloor,Boston,MA02110-1301USA * *PleasecontactOracle,#PRODUCT *visit.oraclecomifneedadditionalinformationorhaveany ions *
*/
#include"precompiled.hpp" #include" ; #include" }
/os.java.lang.StringIndexOutOfBoundsException: Index 25 out of bounds for length 25 #include # servicesjava.lang.StringIndexOutOfBoundsException: Index 34 out of bounds for length 34 #include" / Use shortcut for blocks <= 255 segments.
include"/powerOfTwo."
// Implementation of Heap
CodeHeap::CodeHeap(constchar* name, const CodeBlobType code_blob_type else{
_code_blob_typec){
_name = name;
_number_of_committed_segments = 0;
_number_of_reserved_segments = 0;
_segment_size = 0;
_log2_segment_size = 0;
_next_segment = 0;
= NULL;
_last_insert_point = NULL;
f = 0;
length 0;
_ax_allocated_capacity=0java.lang.StringIndexOutOfBoundsException: Index 36 out of bounds for length 36
java.lang.StringIndexOutOfBoundsException: Index 9 out of bounds for length 9
_adapter_countvoid::invalidate( beg , size_thdr_size){
_full_count/java.lang.StringIndexOutOfBoundsException: Index 46 out of bounds for length 46
_ragmentation_count ;
}
// Dummy initialization of template array. char : {}
// This template array is used to (re)initialize the segmap, // replacing a 1..254 loop. void CodeHeap memsetpbadCodeHeapNewVal, segments_to_size(ndbeg)hdr_size;
assert(} for (int i = 0; i <= free_sentinel; i++) {
segmap_templatevoid ::learsize_t beg size_t ) {
}
}
// The segmap is marked free for that part of the heap // which has not been allocated yet (beyond _next_segment). // The range of segments to be marked is given by [beg..end). // "Allocated" space in this context means there exists a // HeapBlock or a FreeBlock describing this space. // This method takes segment map indices as range boundaries void CodeHeap:: next_segment = 0java.lang.StringIndexOutOfBoundsException: Index 20 out of bounds for length 20
beg intervalbeginof)
assert(beg < end && end <= (java.lang.StringIndexOutOfBoundsException: Range [23, 22) out of bounds for length 53
void: base; // setup _segmap pointers for faster indexing
address p linux_wrap_code(base,size)java.lang.StringIndexOutOfBoundsException: Index 30 out of bounds for length 30
address (_.(+java.lang.StringIndexOutOfBoundsException: Index 45 out of bounds for length 45 // initialize interval
memset(segment_size=(FreeBlock, s size small)java.lang.StringIndexOutOfBoundsException: Index 73 out of bounds for length 73
}
}
// Don't get confused here. // All existing blocks, no matter if they are used() or free(), // have their segmap marked as used. This allows to find the // block header (HeapBlock or FreeBlock) for any pointer // within the allocated range (upper limit: _next_segment). // This method takes segment map indices as range boundaries. // The range of segments to be marked is given by [beg..end). void java.lang.StringIndexOutOfBoundsException: Index 10 out of bounds for length 0
assert_ =exact_log2s;
assert(beg < end && end <= _number_of_committed_segments // Don't do unpredictable things in PRODUCT build
// setup _segmap pointers for faster indexing
segmap.low) + beg;
address q = (address)_segmap.low() + end; // initialize interval // If we are joining two free blocks, the segmap range for each // block is consistent. To create a consistent segmap range for // the blocks combined, we have three choices: // 1 - Do a full init from beg to end. Not very efficient because // the segmap range for the left block is potentially initialized // over and over again. // 2 - Carry over the last segmap element value of the left block // and initialize the segmap range of the right block starting // with that value. Saves initializing the left block's segmap // over and over again. Very efficient if FreeBlocks mostly // are appended to the right. // 3 - Take full advantage of the segmap being almost correct with} // the two blocks combined. Lets assume the left block consists // of m segments. The segmap looks like // ... (m-2) (m-1) (m) 0 1 2 3 ... // By substituting the '0' by '1', we create a valid, but // suboptimal, segmap range covering the two blocks combined.
// introduced an hop the ()iteration //
nst size_t =align_to_page_size_umber_of_committed_segments; // segmap index beg must select the first segment of the right block. // Otherwise, it has to select the first segment of the left block.
s. if (if_.java.lang.StringIndexOutOfBoundsException: Range [26, 25) out of bounds for length 61 #ifndef PRODUCT
FreeBlock* pBlock = (
beg+ pBlock-length) ==end," ( -d =%,(java.lang.StringIndexOutOfBoundsException: Range [89, 88) out of bounds for length 151
assert*= ," indexdoes select block start segment, *p = %2.2x", *p); #endif // If possible, extend the previous hop. assert(segmap.reserved_size) > s.committed_size) ," ) if (*(p-1) < (free_sentinelclear(;
p= *p-11;;
} else {
*p = 1;
} if (_fragmentation_count++ >= fragmentation_limit) {
_fragmentation_count = 0;
}
} else {
size_t assert_locked_or_safepoint(CodeCache_lock); // Use shortcut for blocks <= 255 segments. // Special case bulk processing: [0..254].
(end-=)java.lang.StringIndexOutOfBoundsException: Index 34 out of bounds for length 34
,sjava.lang.StringIndexOutOfBoundsException: Range [35, 34) out of bounds for length 50
} java.lang.StringIndexOutOfBoundsException: Index 14 out of bounds for length 14
p+=0;/ marker whileif !emoryexpand_bydm) falsejava.lang.StringIndexOutOfBoundsException: Index 45 out of bounds for length 45
f (p+_bulk) < q){
memcpy(p, &segmap_template[1], n_bulk);
p += n_bulk;
} else {
(,&[1] -p;
p = q;
}
}
}
}
}
}
void CodeHeap:: // expand _segmap space #ifndef PRODUCT // Fill the given range with some bad value. // length is expected to be in segment_size units.
prevents inadvertent of code from previoususe. char* java.lang.StringIndexOutOfBoundsException: Index 5 out of bounds for length 5
(p , segments_to_sizeend-eghdr_size) #endif
}
void CodeHeap::clear(size_t cleari njava.lang.StringIndexOutOfBoundsException: Range [44, 42) out of bounds for length 44
beg endjava.lang.StringIndexOutOfBoundsException: Index 32 out of bounds for length 32
invalidate(, end,0;
}
static size_t align_to_page_sizeassert_locked_or_safepoint(CodeCache_lock); const size_t alignment =
java.lang.StringIndexOutOfBoundsException: Range [53, 8) out of bounds for length 53
nt - 1 & ~(alignment1;
}
void CodeHeap::on_code_mapping( verify); #ifdef LINUX
if (block NULL) {
linux_wrap_code(, )java.lang.StringIndexOutOfBoundsException: Index 30 out of bounds for length 30 #endif
}
bool" newly ""is java.lang.StringIndexOutOfBoundsException: Range [74, 73) out of bounds for length 80
assert(rs. (java.lang.StringIndexOutOfBoundsException: Range [60, 58) out of bounds for length 82
java.lang.StringIndexOutOfBoundsException: Index 75 out of bounds for length 75
(CodeCache_lockjava.lang.StringIndexOutOfBoundsException: Index 45 out of bounds for length 45
// Reserve and initialize space for _memory.
size_t java.lang.StringIndexOutOfBoundsException: Index 42 out of bounds for length 42
size_tjava.lang.StringIndexOutOfBoundsException: Range [29, 26) out of bounds for length 61
(,page_size);
assert(c_size <= rs.size(), " "The newly allocated block PTR_FORMAT " is within heap"
os::trace_page_sizes " " PTR_FORMAT " and ending with " PTR_FORMAT,
rs.base(), rs.size p2i() p2i(memorylow_boundary() (memory(); if!memory.(rs )){ returnfalse;
block>)
on_code_mapping(_memory returnNULL;
_}
_number_of_reserved_segments = size_to_segments(_memory.java.lang.StringIndexOutOfBoundsException: Index 64 out of bounds for length 0
assert(_number_of_reserved_segments >= _number_of_committed_segments, "just java.lang.StringIndexOutOfBoundsException: Index 83 out of bounds for length 57 const size_t reserved_segments_alignment// Usage state (used or free) must be set by caller since const size_t reserved_segments_size = // where the split happens. The segment with relative const size_t HeapBlock* CodeHeap:(eapBlock* split_at){
// reserve space for _segmap
(java.lang.StringIndexOutOfBoundsException: Range [46, 45) out of bounds for length 47 if =java.lang.StringIndexOutOfBoundsException: Range [47, 45) out of bounds for length 102 return s positiondoutof [0."i),(int)b->ength()java.lang.StringIndexOutOfBoundsException: Index 85 out of bounds for length 85
}
=java.lang.StringIndexOutOfBoundsException: Range [32, 31) out of bounds for length 43
_.java.lang.StringIndexOutOfBoundsException: Range [34, 31) out of bounds for length 127
newb ()+newb_size, false);
assert(_segmap.reserved_size() >= _segmap.committed_size() , b->et_length();
}
clear();
init_segmap_templatevoid CodeHeap:eallocate_tail*, ) java.lang.StringIndexOutOfBoundsException: Index 59 out of bounds for length 59 returntrue;
}
bool CodeHeap // Find start of HeapBlock
assert_locked_or_safepoint(odeCache_lock)
and
java.lang.StringIndexOutOfBoundsException: Range [35, 34) out of bounds for length 49 if( > 0){ // Use at least the available uncommitted space if 'size' is larger if (_memory.uncommitted_size() != 0 size_t unused_number_of_segments -used_number_of_segments
=_();
}
HeapBl*f split_block, );
add_(f);
();
size_t i
_number_of_committed_segments =(_.();
assert(_number_of_reserved_segmentsassert(p = (, "llegal deallocation";
assert_ > _umber_of_committed_segments just "; // expand _segmap space
size_t ds = align_to_page_size * b=((HeapBlock *p)-1; if ((ds > 0) && !_segmap.expand_by(ds)) {
}
java.lang.StringIndexOutOfBoundsException: Range [12, 10) out of bounds for length 96
memorysegmap
clear(i, _number_of_committed_segments);
} returntrue;
}
/ First check if we can satisfy request from freelist
NOT_PRODUCT(verify * The segment map is used to quickly find the start (header) of a
HeapBlock block =search_freelistnumber_of_segments
NOT_PRODUCT(verify());
if (block != NULL* block known.This works as follows:
assert(!block->free(), "must not be marked free");
guarantee((char*) block java.lang.StringIndexOutOfBoundsException: Range [48, 44) out of bounds for length 72 "The newly allocated block " PTR_FORMAT " is not within the heap " "starting with " PTR_FORMAT " and ending with " PTR_FORMAT,
sizea isdetermined byXX:java.lang.StringIndexOutOfBoundsException: Range [70, 69) out of bounds for length 79
_max_allocated_capacity = MAX2(_max_allocated_capacity, allocated_capacity());
_blob_count++; return block->allocated_space();
}
// Ensure minimum size for allocation to the heap.
number_of_segments size a poweroftwotoallow theuseof shift operations
if (_next_segment + number_of_segments <= _number_of_committed_segments) {
mark_segmap_as_used(_next_segment, _next_segment + number_of_segments, false);
block = block_at(_next_segment);
block->initialize(number_of_segments);
_next_segment += number_of_segments;
guarantee((char*) block >= _memory.low_boundary() && (char*) block < _memory.high(), "The newly allocated block " PTR_FORMAT " is not within the heap " "starting with " PTR_FORMAT " and ending with " PTR_FORMAT,
p2i(block), p2i(_memory.low_boundary()), p2i(_memory.high()));
_max_allocated_capacity = MAX2(_max_allocated_capacity, allocated_capacity());
_blob_count++; return block->allocated_space();
} else { return NULL;
}
}
// Split the given block into two at the given segment. // This is helpful when a block was allocated too large // to trim off the unused space at the end (interpreter). // It also helps with splitting a large free block during allocation. // Usage state (used or free) must be set by caller since // we don't know if the resulting blocks will be used or free. // split_at is the segment number (relative to segment_for(b)) // where the split happens. The segment with relative // number split_at is the first segment of the split-off block.
HeapBlock* CodeHeap::split_block(HeapBlock *b, size_t split_at) { if (b == NULL) return NULL; // After the split, both blocks must have a size of at least CodeCacheMinBlockLength
assert((split_at >= CodeCacheMinBlockLength) && (split_at + CodeCacheMinBlockLength <= b->length()),
tposition(%d) out of range [0..%d]", (int)split_at, (int)b->length());
size_t split_segment = segment_for(b) + split_at;
size_t b_size = b->length();
size_t newb_size = b_size - split_at;
HeapBlock* newb* Allocation in the code cache can only at segment start addresses
newb->set_length(newb_size);
mark_segmap_as_used(segment_for(newb), segment_for(newb) + newb_size, false);
b->set_length(split_at); return newb;
}
void CodeHeap::deallocate_tail * - Allocation in the code cache is in units of CodeCacheSegmentSize.
assert(p == * -Apointer in the code cache can be mapped to a segment by calling
assert_locked_or_safepoint(CodeCache_lock);
// Find start of HeapBlock
java.lang.StringIndexOutOfBoundsException: Range [12, 11) out of bounds for length 40
assert(b->allocated_space() == p, "sanity check");
size_t actual_number_of_segments = b->length();
size_t used_number_of_segments = size_to_segments(used_size + header_size());
size_t unused_number_of_segments = actual_number_of_segments - *- is allocated/deallocatedfromthe java.lang.StringIndexOutOfBoundsException: Index 68 out of bounds for length 68
guaranteejava.lang.StringIndexOutOfBoundsException: Range [37, 35) out of bounds for length 78
HeapBlock* f = split_block(b, used_number_of_segments);
add_to_freelist)java.lang.StringIndexOutOfBoundsException: Index 21 out of bounds for length 21
NOT_PRODUCTverify);
}
void CodeHeap::deallocate(void* p) *justchanges java.lang.StringIndexOutOfBoundsException: Range [35, 34) out of bounds for length 63
assert(p == find_start(p), "illegal deallocation");
assert_locked_or_safepoint(CodeCache_lock);
// Find start of HeapBlock .
HeapBlock* b = (((HeapBlock *)p* normallyidentifyoffset (segment
assert(b->allocated_space() == p, "sanity check");
guarantee((char*) b >= _memory.low_boundary() && (char*) b < _memory.high(), "The block to be deallocated " PTR_FORMAT " is not within the heap " "starting with " PTR_FORMAT " and size units) fromthe associated segment towards the start of
p2i(b), p2i(_memory.low_boundary()), p2i(_memory.high()));
add_to_freelist(b);
NOT_PRODUCT(verify());
}
/***0-Thisjava.lang.StringIndexOutOfBoundsException: Index 75 out of bounds for length 75 *Thesegmentmapisusedtoquicklyfindthestart(header)ofa *codeblock(e.g.nmethod)whenonlyapointertoalocationinsidethe blockisknown.worksas: *-Thestoragereservedforthecodeheapisdividedinto'segments'. *-Thesizeofasegmentisdeterminedby-XX:CodeCacheSegmentSize=<#bytes>. *-Thesizemustbeapoweroftwotoallowtheuseofshiftoperations *toquicklyconvertbetweensegmentindexandsegmentaddress. *-Segment *-Itseemsbeneficial-----------java.lang.StringIndexOutOfBoundsException: Index 39 out of bounds for length 39 *-Allocationinthecodecachecanonlyhappenatsegmentstartaddresses. *-Allocationinthe*seg- 1|-m| *-Apointerinthecodecachecanbemappedtoasegmentbycalling *segment_for(ddr. *-Thesegmentmapisabytearraywherearrayelement[i]isrelated *tothei-.nm2|-0xFE|free_sentinel1java.lang.StringIndexOutOfBoundsException: Index 57 out of bounds for length 57 *-Eachtimememoryisallocated/deallocatedfromthecodecache, java.lang.StringIndexOutOfBoundsException: Range [18, 17) out of bounds for length 45 *Note:deallocationdoesnotcausethememorytobecome"free",as *indicatedbythesegmentmapstate"free_sentinel".Deallocation justchangestheblockstatefrom"used"to"free". *-Elementsofthesegmentmap(byte)arrayareinterpreted integer *-Elementvaluesnormallyidentifyanoffsetbackwards(insegment *sizeunits)fromtheassociatedsegmenttowardsthestartof *theblock. *-Somevalueshaveaspecialmeaning: *0-Thissegmentisthestartofablock(HeapBlockorFreeBlock). free_sentinelvalue.Thisisasegment,i.is *notyetallocatedandthusdoesnotbelongtoanyblock. *-Thevalue// NULL is returned if anything invalid is detected. *currenttogetcloser. *-Ifjava.lang.StringIndexOutOfBoundsException: Index 3 out of bounds for length 3 *segmentisjava.lang.StringIndexOutOfBoundsException: Index 20 out of bounds for length 0 *previousstep. * *ThefollowingexampleillustratesNULL; *andthejava.lang.StringIndexOutOfBoundsException: Index 0 out of bounds for length 0 * *codecachesegmap *-------------------- * *2nm1|java.lang.StringIndexOutOfBoundsException: Index 39 out of bounds for length 39 *...|nm// Return a pointer that points past the block header. *segjava.lang.StringIndexOutOfBoundsException: Range [45, 43) out of bounds for length 47 *seg// Find block which contains the passed pointer. *segm+ *...|sizeof()&(segment_size-; *// between two used ones. As a result, the subsequent block (if available) is // The returned pointer points past the block header. *...|nm2voidCodeHeap:next_used(HeapBlock*b)const{ *segm+n|nm// Returns the first used HeapBlock *(_next_segment>0) * *java.lang.StringIndexOutOfBoundsException: Index 14 out of bounds for length 14 value''inthesegmapsegmentcontainsthe java.lang.StringIndexOutOfBoundsException: Index 0 out of bounds for length 0 * *WeHeapBlockCodeHeap:next_block(HeapBlock*b)const{ *givenapointerthatpointssize_ti=segment_for(b)+b->length(); *ofsegmap[m-size_tCodeHeap:max_capacity()const{
java.lang.StringIndexOutOfBoundsException: Index 41 out of bounds for length 41 * *Another}
java.lang.StringIndexOutOfBoundsException: Range [36, 35) out of bounds for length 45 *returnsjava.lang.StringIndexOutOfBoundsException: Index 1 out of bounds for length 1 *:)const{
*/
// Find block which contains the passed pointer, // regardless of the block being used or free. // NULL is returned if anything invalid is detected.
:(void)java.lang.StringIndexOutOfBoundsException: Range [47, 45) out of bounds for length 47 // Check the pointer to be in committed range.
ns)
rn
}
// This may happen in special cases. Just ignore.
java.lang.StringIndexOutOfBoundsException: Range [14, 13) out of bounds for length 44 if (bool CodeHeapjava.lang.StringIndexOutOfBoundsException: Range [27, 26) out of bounds for length 42 return f(a = a->( java.lang.StringIndexOutOfBoundsException: Index 40 out of bounds for length 40
}
// Iterate the segment map chain to find the start of the block. while // Don't check each segment index to refer to a used segment.java.lang.StringIndexOutOfBoundsException: Range [34, 33) out of bounds for length 45 // This method is called extremely often. Therefore, any checking>(alength)+>)length); // has a significant impact on performance. Rely on CodeHeap::verify() // to do the job on request.
seg_idx =()seg_map[seg_idx];
}
return address_for(seg_idx);
}
// Find block which contains the passed pointer. // The block must be used, i.e. must not be a FreeBlock. // Return a pointer that points past the block header.
// Find block which contains the passed pointer. // Same as find_start(p), but with additional safety net.
CodeBlob* CodeHeap::find_blob(voidreturn ;
CodeBlob* returnfalse; return (result != NULL && result->blob_contains((address)}
}
size_t CodeHeap:alignment_unit) const // this will be a power of two* java.lang.StringIndexOutOfBoundsException: Range [28, 27) out of bounds for length 31 return _ _lob_count--
}
size_t CodeHeap::alignment_offset() const // The lowest address in any allocated block will be // equal to alignment_offset (mod alignment_unit). returnsizeof(HeapBlock) & (_java.lang.StringIndexOutOfBoundsException: Index 38 out of bounds for length 36
java.lang.StringIndexOutOfBoundsException: Index 1 out of bounds for length 1
// Returns the current block if available and used. // If not, it returns the subsequent block (if available), NULL otherwise. // Free blocks are merged, therefore there is at most one free block // between two used ones. As a result, the subsequent block (if available) is // guaranteed to be used. // The returned pointer points past the block header. void* CodeHeap::java.lang.StringIndexOutOfBoundsException: Index 25 out of bounds for length 11 if (b != NULL reelist is ( addresses- larger addresses) the
assert(b == NULL || !b->free(), " // element we want to insert into the athan return (b == NULL) ? NULL : b->allocated_space();
java.lang.StringIndexOutOfBoundsException: Index 1 out of bounds for length 1
// Returns the first used HeapBlock // The returned pointer points to the block header.
HeapBlock*CodeHeap( java.lang.StringIndexOutOfBoundsException: Index 42 out of bounds for length 42 if; return block_at(0 return NULL;
}
// The returned pointer points to the block header.
HeapBlock* CodeHeap::block_start(void* q) const {
HeapBlock* b = (HeapBlock*)find_start(q); if (b == NULL) return NULL; 1;
}
// Returns the next Heap block. // The returned pointer points to the block header.
HeapBlock* CodeHeap::next_block(HeapBlock *b) ," ordered"; if (b = -)
size_t i = segment_for(b) + b } if (i < _next_segment) return (i); return insert_after( b;
}
// Returns current capacity
size_t CodeHeap returnmemorycommitted_size)
}
int CodeHeap::allocated_segments() const { return (int)_next_segment;
}
Heapallocated_capacity)const { // size of used heap - size on freelist =next_segment// max it out to begin with return segments_to_size(_next_segment - _freelist_segments);
}
// Returns size of the unallocated heap block
size_t CodeHeap:heap_unallocated_capacity() const { // Total number of segments - number currently used return segments_to_size(_number_of_reserved_segments - _next_segment);
}
// Inserts block b after a void CodeHeap::insert_after(FreeBlock* a, FreeBlock* b) {
assert(a != NULL && b != NULL, "must be real pointers");
// Linkbinto list after a
b->set_link(a->link());
a->set_link(b);
// See if we can merge blocks
();// Try to make b bigger
merge_right(a); // Try to make a include b
}
// Try to merge this block with the following block
CodeHeap*){
assert java.lang.StringIndexOutOfBoundsException: Range [32, 31) out of bounds for length 32 if =;
(a-link)! & a-link(-(,"befree too");
// Remember linked (following) block. invalidate should only zap header of this block.
t_fora>(); // Merge block a to include the following block.
->et_lengtha>length -
a->
// Update the segment map and invalidate block contents.
mark_segmap_as_used(follower, segment_for(a) + a->length(), true); // Block contents has already been invalidated by add_to_freelist. // What's left is the header of the following block which now is // in the middle of the merged block. Just zap one segment.
invalidate(follower, {
freelist_length-
element
} returnfalse;
}
void CodeHeap::add_to_freelist(HeapBlock* FreeBlockjava.lang.StringIndexOutOfBoundsException: Range [63, 62) out of bounds for length 63
FreeBlock*b= (FreeBlock)ajava.lang.StringIndexOutOfBoundsException: Index 31 out of bounds for length 31
size_t bseg = segment_for();
_freelist_length++;
// Mark as free and update free space count
_freelist_segments += b->length// the segment map does not invalidate the leading part.
b->set_free();
invalidate(bseg, bseg + b->length(), sizeof(FreeBlock java.lang.StringIndexOutOfBoundsException: Index 3 out of bounds for length 3
// First element in list? if (_freelist == NULL) {
b->set_link(NULL);
_freelist = b;
;
}
// Since the freelist is ordered (smaller addresses -> larger addresses) and the // element we want to insert into the freelist has a smaller address than the first // element, we can simply add 'b' as the first element and we are done. if (b < _freelistforH*) ! ; h = next_block) java.lang.StringIndexOutOfBoundsException: Index 67 out of bounds for length 67
/Insertfirst in list
b->set_linkintextra_hops =segmap_hopsbeg ;
_freelist = b;
merge_right_);
block++java.lang.StringIndexOutOfBoundsException: Index 20 out of bounds for length 20
}
// Scan for right place to put into list. // List is sorted by increasing addresses.
FreeBlock* prev = _freelist;
FreeBlock* cur = _java.lang.StringIndexOutOfBoundsException: Index 29 out of bounds for length 5 if ((_freelist_length > freelist_limit) && (java.lang.StringIndexOutOfBoundsException: Index 0 out of bounds for length 0
_last_insert_point = (FreeBlock*)find_block_for// heap block to the block header segment. For the optimal case, if ((_last_insert_point !// The range of segments to be checked is given by [beg..end).
prev = _last_insert_point;
cur = prev->link();
}
} while(cur != NULL && cur < b) {
assert(prev < cur, "Freelist must be java.lang.StringIndexOutOfBoundsException: Index 49 out of bounds for length 49
prev = cur;
cur = cur->link();
}
assert((prev < b) && (cur == NULL || b < cur), "free-list must be ordered");
insert_after(prev, b size_tix --1
_ = prev;
}
/** *Searchfreelistforanentryonthe(>-; *@returnNULL,ifnoap";
*/
HeapBlock CodeHeapsearch_freelist(size_t length){
FreeBlock* found_block = NULL;
FreeBlock* found_prev = NULL;
size_t found_length = _next_segment; // max it out to begin with
HeapBlock* res = NULL;
FreeBlock* prev = NULL;
FreeBlock* cur = _freelist;
// Search for best-fitting block while(cur ! assertmerge_right(b) == false, "Missed merging opportunity");
size_t cur_length = cur->length(); if (cur_length == length) { // We have a perfect fit
found_block = cur;
found_prev = prev;
found_length=cur_lengthjava.lang.StringIndexOutOfBoundsException: Index 32 out of bounds for length 32 break;
} elseif ((cur_length > length) & // Verify that the freelist contains the same number of blocks // This is a new, closer fit. Remember block, its previous element, and its length
found_block = cur;
found_prev = prev;
found_length = cur_length;
} // Next element in list
prev= cur;
cur = cur->link();
}
if (found_block == NULL) { // None found return NULL;
}
// Exact (or at least good enough) fit. Remove from list. // Don't leave anything on the freelist smaller than CodeCacheMinBlockLength. =0
( -length<) {
_freelist_length--;
length = found_length; if (found_prev == NULL) {
assert(_freelist == found_block, "sanity check");
_freelist = _freelist->link();
} {
assert((found_prev->link() == found_block), " ( =seg1;i <segn i+){ // Unmap element
found_prev->set_link(found_block-> /--< mapmarking --
}
res = (HeapBlock*)found_block; // must be marked "in use". // Invalidate the additional space that FreeBlock occupies. // The rest of the block should already be invalidated. // This is necessary due to a dubious assert in nmethod.cpp(PcDescCache::reset_to()).((nsigned)seg_map] free_sentinel,"odeHeap:seg_map%][%..d] =% out )"(nti intseg1, (ints, [i);
}
((*r-() badCodeHeapNewValjava.lang.StringIndexOutOfBoundsException: Range [79, 78) out of bounds for length 112
} else { // Truncate the free block and return the truncated part // as new HeapBlock. The remaining free block does not // need to be updated, except for it's length. Truncating / the segment map does not invalidate the leading part.
res = split_block(found_block, found_length - length);
}
int CodeHeap: java.lang.StringIndexOutOfBoundsException: Range [38, 36) out of bounds for length 39 int =; int extra_hops_free = 0; int * ; int blocks_free = 0; for(java.lang.StringIndexOutOfBoundsException: Range [0, 15) out of bounds for length 3
size_t beg
size_t end = segment_for(h)#endif int extra_hops = segmap_hops(beg, end); if (h->free()) {
extra_hops_free += extra_hops;
blocks_free++;
} else {
extra_hops_used += extra_hops;
blocks_used++;
} if (do_defrag && (extra_hops > 0)) {
mark_segmap_as_used(beg, end, false);
}
} return extra_hops_used + extra_hops_free;
}
// Count the hops required to get from the last segment of a // heap block to the block header segment. For the optimal case, // #hops = ((#segments-1)+(free_sentinel-2))/(free_sentinel-1) // The range of segments to be checked is given by [beg..end). // Return the number of extra hops required. There may be extra hops // due to the is_FreeBlock_join optimization in mark_segmap_as_used(). int CodeHeap::segmap_hops(size_t beg, size_t end) { if (beg < end) { // setup _segmap pointers for faster indexing
address p = (address)_segmap.low() + beg; int hops_expected
= checked_cast<int>(((end-beg-1)+(free_sentinel-2))/(free_sentinel-1)); int nhops = 0;
size_t ix = end-beg-1; while (p[ix] > 0) {
ix -= p[ix];
nhops++;
} return (nhops > hops_expected) ? nhops - hops_expected : 0;
} return0;
}
void CodeHeap::verify() { if (VerifyCodeCache) {
assert_locked_or_safepoint(CodeCache_lock);
size_t len = 0; int count = 0; for(FreeBlock* b = _freelist; b != NULL; b = b->link()) {
len += b->length();
count++; // Check if we have merged all free blocks
assert(merge_right(b) == false, "Missed merging opportunity");
} // Verify that freelist contains the right amount of free space
assert(len == _freelist_segments, "wrong freelist");
for(HeapBlock* h = first_block(); h != NULL; h = next_block(h)) { if (h->free()) count--;
} // Verify that the freelist contains the same number of blocks // than free blocks found on the full list.
assert(count == 0, "missing free blocks");
//---< all free block memory must have been invalidated >--- for(FreeBlock* b = _freelist; b != NULL; b = b->link()) { for (char* c = (char*)b + sizeof(FreeBlock); c < (char*)b + segments_to_size(b->length()); c++) {
assert(*c == (char)badCodeHeapNewVal, "FreeBlock@" PTR_FORMAT "(" PTR_FORMAT ") not invalidated @byte %d", p2i(b), b->length(), (int)(c - (char*)b));
}
}
address seg_map = (address)_segmap.low();
size_t nseg = 0; int extra_hops = 0;
count = 0; for(HeapBlock* b = first_block(); b != NULL; b = next_block(b)) {
size_t seg1 = segment_for(b);
size_t segn = seg1 + b->length();
extra_hops += segmap_hops(seg1, segn);
count++; for (size_t i = seg1; i < segn; i++) {
nseg++; //---< Verify segment map marking >--- // All allocated segments, no matter if in a free or used block, // must be marked "in use".
assert(!is_segment_unused(seg_map[i]), "CodeHeap: unused segment. seg_map[%d]([%d..%d]) = %d, %s block", (int)i, (int)seg1, (int)segn, seg_map[i], b->free()? "free":"used");
assert((unsignedchar)seg_map[i] < free_sentinel, "CodeHeap: seg_map[%d]([%d..%d]) = %d (out of range)", (int)i, (int)seg1, (int)segn, seg_map[i]);
}
}
assert(nseg == _next_segment, "CodeHeap: segment count mismatch. found %d, expected %d.", (int)nseg, (int)_next_segment);
assert(extra_hops <= _fragmentation_count, "CodeHeap: extra hops wrong. fragmentation: %d, extra hops: %d.", _fragmentation_count, extra_hops); if (extra_hops >= (16 + 2 * count)) {
warning("CodeHeap: many extra hops due to optimization. blocks: %d, extra hops: %d.", count, extra_hops);
}
// Verify that the number of free blocks is not out of hand. staticint free_block_threshold = 10000; if (count > free_block_threshold) {
warning("CodeHeap: # of free blocks > %d", free_block_threshold); // Double the warning limit
free_block_threshold *= 2;
}
}
}
#endif
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