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6839888: Array overrun in vm adlc

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Reviewed-by: kvn, iveresov
This commit is contained in:
Tom Rodriguez 2010-12-16 12:47:52 -08:00
parent 4c405911ef
commit b80ad03e3f
1 changed files with 3 additions and 3 deletions
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6
hotspot/src/share/vm/adlc/dict2.cpp
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@ -34,7 +34,7 @@
#define MAXID 20 #define MAXID 20
static char initflag = 0; // True after 1st initialization static char initflag = 0; // True after 1st initialization
static char shft[MAXID] = {1,2,3,4,5,6,7,1,2,3,4,5,6,7,1,2,3,4,5,6}; static char shft[MAXID] = {1,2,3,4,5,6,7,1,2,3,4,5,6,7,1,2,3,4,5,6};
static short xsum[MAXID + 1]; static short xsum[MAXID];
//------------------------------bucket--------------------------------------- //------------------------------bucket---------------------------------------
class bucket { class bucket {
@ -66,7 +66,7 @@ void Dict::init() {
// Precompute table of null character hashes // Precompute table of null character hashes
if( !initflag ) { // Not initializated yet? if( !initflag ) { // Not initializated yet?
xsum[0] = (1<<shft[0])+1; // Initialize xsum[0] = (1<<shft[0])+1; // Initialize
for( i = 1; i < MAXID + 1; i++) { for( i = 1; i < MAXID; i++) {
xsum[i] = (1<<shft[i])+1+xsum[i-1]; xsum[i] = (1<<shft[i])+1+xsum[i-1];
} }
initflag = 1; // Never again initflag = 1; // Never again
@ -291,7 +291,7 @@ int hashstr(const void *t) {
c = (c<<1)+1; // Characters are always odd! c = (c<<1)+1; // Characters are always odd!
sum += c + (c<<shft[k++]); // Universal hash function sum += c + (c<<shft[k++]); // Universal hash function
} }
assert( k < (MAXID + 1), "Exceeded maximum name length"); assert( k < (MAXID), "Exceeded maximum name length");
return (int)((sum+xsum[k]) >> 1); // Hash key, un-modulo'd table size return (int)((sum+xsum[k]) >> 1); // Hash key, un-modulo'd table size
} }