8006005: Fix constant pool index validation and alignment trap for method parameter reflection
Summary: This patch addresses an alignment trap due to the storage format of method parameters data in constMethod. It also adds code to validate constant pool indexes for method parameters data.
Reviewed-by: jrose, dholmes
Contributed-by: eric.mccorkle@oracle.com
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#ifndef SHARE_VM_LIBADT_DICT_HPP
#define SHARE_VM_LIBADT_DICT_HPP
#include "libadt/port.hpp"
// Dictionaries - An Abstract Data Type
//INTERFACE
class ostream;
class Dict;
// These dictionaries define a key-value mapping. They can be inserted to,
// searched or deleted from. They grow and shrink as needed. The key is a
// pointer to something (or anything which can be stored in a pointer). A
// key comparison routine determines if two keys are equal or not. A hash
// function can be provided; if it's not provided the key itself is used
// instead. A nice string hash function is included.
typedef int32 (*CmpKey)(const void *key1, const void *key2);
typedef int (*Hash)(const void *key);
typedef void (*FuncDict)(const void *key, const void *val, Dict *d);
class Dict : public ResourceObj { // Dictionary structure
private:
class Arena *_arena; // Where to draw storage from
class bucket *_bin; // Hash table is array of buckets
uint _size; // Size (# of slots) in hash table
uint32 _cnt; // Number of key-value pairs in hash table
const Hash _hash; // Hashing function
const CmpKey _cmp; // Key comparison function
void doubhash( void ); // Double hash table size
public:
friend class DictI; // Friendly iterator function
// cmp is a key comparision routine. hash is a routine to hash a key.
Dict( CmpKey cmp, Hash hash );
Dict( CmpKey cmp, Hash hash, Arena *arena, int size=16 );
~Dict();
Dict( const Dict & ); // Deep-copy guts
Dict &operator =( const Dict & );
// Zap to empty; ready for re-use
void Clear();
// Return # of key-value pairs in dict
uint32 Size(void) const { return _cnt; }
// Insert inserts the given key-value pair into the dictionary. The prior
// value of the key is returned; NULL if the key was not previously defined.
void *Insert(void *key, void *val, bool replace = true); // A new key-value
void *Delete(void *key); // Delete & return old
// Find finds the value of a given key; or NULL if not found.
// The dictionary is NOT changed.
void *operator [](const void *key) const; // Do a lookup
// == compares two dictionaries; they must have the same keys (their keys
// must match using CmpKey) and they must have the same values (pointer
// comparison). If so 1 is returned, if not 0 is returned.
int32 operator ==(const Dict &d) const; // Compare dictionaries for equal
// Print out the dictionary contents as key-value pairs
void print();
};
// Hashing functions
int hashstr(const void *s); // Nice string hash
// Slimey cheap hash function; no guaranteed performance. Better than the
// default for pointers, especially on MS-DOS machines.
int hashptr(const void *key);
// Slimey cheap hash function; no guaranteed performance.
int hashkey(const void *key);
// Key comparators
int32 cmpstr(const void *k1, const void *k2);
// Slimey cheap key comparator.
int32 cmpkey(const void *key1, const void *key2);
//------------------------------Iteration--------------------------------------
// The class of dictionary iterators. Fails in the presences of modifications
// to the dictionary during iteration (including searches).
// Usage: for( DictI i(dict); i.test(); ++i ) { body = i.key; body = i.value;}
class DictI {
private:
const Dict *_d; // Dictionary being iterated over
uint _i; // Counter over the bins
uint _j; // Counter inside each bin
public:
const void *_key, *_value; // Easy access to the key-value pair
DictI( const Dict *d ) {reset(d);}; // Create a new iterator
void reset( const Dict *dict ); // Reset existing iterator
void operator ++(void); // Increment iterator
int test(void) { return _i<_d->_size;} // Test for end of iteration
};
#endif // SHARE_VM_LIBADT_DICT_HPP