#include <config.h>
#include <jvm.h>
#include <gcj/cni.h>
#include <java-insns.h>
#include <java-interp.h>
#undef PC
#ifdef INTERPRETER
#include <java/lang/Class.h>
#include <java/lang/VerifyError.h>
#include <java/lang/Throwable.h>
#include <java/lang/reflect/Modifier.h>
#include <java/lang/StringBuffer.h>
#ifdef VERIFY_DEBUG
#include <stdio.h>
#endif
#define INVALID_STATE ((state *) -1)
static void debug_print (const char *fmt, ...)
__attribute__ ((format (printf, 1, 2)));
static inline void
debug_print (MAYBE_UNUSED const char *fmt, ...)
{
#ifdef VERIFY_DEBUG
va_list ap;
va_start (ap, fmt);
vfprintf (stderr, fmt, ap);
va_end (ap);
#endif
}
class _Jv_BytecodeVerifier
{
private:
static const int FLAG_INSN_START = 1;
static const int FLAG_BRANCH_TARGET = 2;
struct state;
struct type;
struct linked_utf8;
struct ref_intersection;
template<typename T>
struct linked
{
T *val;
linked<T> *next;
};
int PC;
int start_PC;
state *current_state;
linked<state> **states;
state *next_verify_state;
char *flags;
unsigned char *bytecode;
_Jv_InterpException *exception;
jclass current_class;
_Jv_InterpMethod *current_method;
linked<_Jv_Utf8Const> *utf8_list;
ref_intersection *isect_list;
_Jv_Utf8Const *make_utf8_const (char *s, int len)
{
linked<_Jv_Utf8Const> *lu = (linked<_Jv_Utf8Const> *)
_Jv_Malloc (sizeof (linked<_Jv_Utf8Const>)
+ _Jv_Utf8Const::space_needed(s, len));
_Jv_Utf8Const *r = (_Jv_Utf8Const *) (lu + 1);
r->init(s, len);
lu->val = r;
lu->next = utf8_list;
utf8_list = lu;
return r;
}
__attribute__ ((__noreturn__)) void verify_fail (char *s, jint pc = -1)
{
using namespace java::lang;
StringBuffer *buf = new StringBuffer ();
buf->append (JvNewStringLatin1 ("verification failed"));
if (pc == -1)
pc = start_PC;
if (pc != -1)
{
buf->append (JvNewStringLatin1 (" at PC "));
buf->append (pc);
}
_Jv_InterpMethod *method = current_method;
buf->append (JvNewStringLatin1 (" in "));
buf->append (current_class->getName());
buf->append ((jchar) ':');
buf->append (method->get_method()->name->toString());
buf->append ((jchar) '(');
buf->append (method->get_method()->signature->toString());
buf->append ((jchar) ')');
buf->append (JvNewStringLatin1 (": "));
buf->append (JvNewStringLatin1 (s));
throw new java::lang::VerifyError (buf->toString ());
}
enum type_val
{
void_type,
boolean_type = 4,
char_type = 5,
float_type = 6,
double_type = 7,
byte_type = 8,
short_type = 9,
int_type = 10,
long_type = 11,
unsuitable_type,
return_address_type,
continuation_type,
reference_type,
null_type,
uninitialized_reference_type
};
struct ref_intersection
{
bool is_resolved;
union
{
jclass klass;
_Jv_Utf8Const *name;
} data;
ref_intersection *ref_next;
ref_intersection *alloc_next;
ref_intersection (jclass klass, _Jv_BytecodeVerifier *verifier)
: ref_next (NULL)
{
is_resolved = true;
data.klass = klass;
alloc_next = verifier->isect_list;
verifier->isect_list = this;
}
ref_intersection (_Jv_Utf8Const *name, _Jv_BytecodeVerifier *verifier)
: ref_next (NULL)
{
is_resolved = false;
data.name = name;
alloc_next = verifier->isect_list;
verifier->isect_list = this;
}
ref_intersection (ref_intersection *dup, ref_intersection *tail,
_Jv_BytecodeVerifier *verifier)
: ref_next (tail)
{
is_resolved = dup->is_resolved;
data = dup->data;
alloc_next = verifier->isect_list;
verifier->isect_list = this;
}
bool equals (ref_intersection *other, _Jv_BytecodeVerifier *verifier)
{
if (! is_resolved && ! other->is_resolved
&& _Jv_equalUtf8Consts (data.name, other->data.name))
return true;
if (! is_resolved)
resolve (verifier);
if (! other->is_resolved)
other->resolve (verifier);
return data.klass == other->data.klass;
}
ref_intersection *merge (ref_intersection *other,
_Jv_BytecodeVerifier *verifier)
{
ref_intersection *tail = other;
for (ref_intersection *self = this; self != NULL; self = self->ref_next)
{
bool add = true;
for (ref_intersection *iter = other; iter != NULL;
iter = iter->ref_next)
{
if (iter->equals (self, verifier))
{
add = false;
break;
}
}
if (add)
tail = new ref_intersection (self, tail, verifier);
}
return tail;
}
void resolve (_Jv_BytecodeVerifier *verifier)
{
if (is_resolved)
return;
using namespace java::lang;
java::lang::ClassLoader *loader
= verifier->current_class->getClassLoaderInternal();
if (data.name->first() == 'L' && data.name->limit()[-1] == ';')
data.klass = _Jv_FindClassFromSignature (data.name->chars(), loader);
else
data.klass = Class::forName (_Jv_NewStringUtf8Const (data.name),
false, loader);
is_resolved = true;
}
bool compatible (ref_intersection *other,
_Jv_BytecodeVerifier *verifier)
{
ref_intersection *self = this;
for (; self != NULL; self = self->ref_next)
{
ref_intersection *other_iter = other;
for (; other_iter != NULL; other_iter = other_iter->ref_next)
{
if (! self->is_resolved
&& ! other_iter->is_resolved
&& _Jv_equalUtf8Consts (self->data.name,
other_iter->data.name))
continue;
if (! self->is_resolved)
self->resolve(verifier);
if (! other_iter->is_resolved)
other_iter->resolve(verifier);
if (! is_assignable_from_slow (self->data.klass,
other_iter->data.klass))
return false;
}
}
return true;
}
bool isarray ()
{
if (is_resolved)
return data.klass->isArray ();
else
return data.name->first() == '[';
}
bool isinterface (_Jv_BytecodeVerifier *verifier)
{
if (! is_resolved)
resolve (verifier);
return data.klass->isInterface ();
}
bool isabstract (_Jv_BytecodeVerifier *verifier)
{
if (! is_resolved)
resolve (verifier);
using namespace java::lang::reflect;
return Modifier::isAbstract (data.klass->getModifiers ());
}
jclass getclass (_Jv_BytecodeVerifier *verifier)
{
if (! is_resolved)
resolve (verifier);
return data.klass;
}
int count_dimensions ()
{
int ndims = 0;
if (is_resolved)
{
jclass k = data.klass;
while (k->isArray ())
{
k = k->getComponentType ();
++ndims;
}
}
else
{
char *p = data.name->chars();
while (*p++ == '[')
++ndims;
}
return ndims;
}
void *operator new (size_t bytes)
{
return _Jv_Malloc (bytes);
}
void operator delete (void *mem)
{
_Jv_Free (mem);
}
};
type_val get_type_val_for_signature (jchar sig)
{
type_val rt;
switch (sig)
{
case 'Z':
rt = boolean_type;
break;
case 'B':
rt = byte_type;
break;
case 'C':
rt = char_type;
break;
case 'S':
rt = short_type;
break;
case 'I':
rt = int_type;
break;
case 'J':
rt = long_type;
break;
case 'F':
rt = float_type;
break;
case 'D':
rt = double_type;
break;
case 'V':
rt = void_type;
break;
default:
verify_fail ("invalid signature");
}
return rt;
}
type_val get_type_val_for_signature (jclass k)
{
return get_type_val_for_signature ((jchar) k->method_count);
}
static bool is_assignable_from_slow (jclass target, jclass source)
{
while (target->isArray ())
{
if (! source->isArray ())
return false;
target = target->getComponentType ();
source = source->getComponentType ();
}
if (target == &java::lang::Object::class$)
return true;
do
{
if (source == target)
return true;
if (target->isPrimitive () || source->isPrimitive ())
return false;
if (target->isInterface ())
{
for (int i = 0; i < source->interface_count; ++i)
{
if (is_assignable_from_slow (target, source->interfaces[i]))
return true;
}
}
source = source->getSuperclass ();
}
while (source != NULL);
return false;
}
struct type
{
type_val key;
ref_intersection *klass;
int pc;
static const int UNINIT = -2;
static const int SELF = -1;
type ()
{
key = unsuitable_type;
klass = NULL;
pc = UNINIT;
}
type (type_val k)
{
key = k;
klass = NULL;
pc = UNINIT;
}
type (jclass k, _Jv_BytecodeVerifier *verifier)
{
key = reference_type;
klass = new ref_intersection (k, verifier);
pc = UNINIT;
}
type (_Jv_Utf8Const *n, _Jv_BytecodeVerifier *verifier)
{
key = reference_type;
klass = new ref_intersection (n, verifier);
pc = UNINIT;
}
type (const type &t)
{
key = t.key;
klass = t.klass;
pc = t.pc;
}
void *operator new[] (size_t bytes)
{
return _Jv_Malloc (bytes);
}
void operator delete[] (void *mem)
{
_Jv_Free (mem);
}
type& operator= (type_val k)
{
key = k;
klass = NULL;
pc = UNINIT;
return *this;
}
type& operator= (const type& t)
{
key = t.key;
klass = t.klass;
pc = t.pc;
return *this;
}
type &promote ()
{
if (key == boolean_type || key == char_type
|| key == byte_type || key == short_type)
key = int_type;
return *this;
}
void set_uninitialized (int npc, _Jv_BytecodeVerifier *verifier)
{
if (key == reference_type)
key = uninitialized_reference_type;
else
verifier->verify_fail ("internal error in type::uninitialized");
pc = npc;
}
void set_initialized (int npc)
{
if (npc != UNINIT && pc == npc && key == uninitialized_reference_type)
{
key = reference_type;
pc = UNINIT;
}
}
void set_return_address (int npc)
{
pc = npc;
}
bool state_mergeable_p (const type &other) const
{
return (key != return_address_type
|| other.key != return_address_type
|| pc == other.pc);
}
bool compatible (type &k, _Jv_BytecodeVerifier *verifier)
{
if (key == unsuitable_type)
return true;
if (key < reference_type || k.key < reference_type)
return key == k.key;
if (key == null_type)
return k.key != uninitialized_reference_type;
if (k.key == null_type)
return key != uninitialized_reference_type;
if (klass == NULL)
return true;
if (k.klass == NULL)
verifier->verify_fail ("programmer error in type::compatible");
if (isinitialized () != k.isinitialized ())
return false;
if (! isinitialized ())
{
if (pc != k.pc && pc != UNINIT && k.pc != UNINIT)
return false;
}
return klass->compatible(k.klass, verifier);
}
bool isvoid () const
{
return key == void_type;
}
bool iswide () const
{
return key == long_type || key == double_type;
}
int depth () const
{
return iswide () ? 2 : 1;
}
bool isarray () const
{
if (key == reference_type)
return klass->isarray ();
return false;
}
bool isnull () const
{
return key == null_type;
}
bool isinterface (_Jv_BytecodeVerifier *verifier)
{
if (key != reference_type)
return false;
return klass->isinterface (verifier);
}
bool isabstract (_Jv_BytecodeVerifier *verifier)
{
if (key != reference_type)
return false;
return klass->isabstract (verifier);
}
type element_type (_Jv_BytecodeVerifier *verifier)
{
if (key != reference_type)
verifier->verify_fail ("programmer error in type::element_type()", -1);
jclass k = klass->getclass (verifier)->getComponentType ();
if (k->isPrimitive ())
return type (verifier->get_type_val_for_signature (k));
return type (k, verifier);
}
type to_array (_Jv_BytecodeVerifier *verifier)
{
if (key != reference_type)
verifier->verify_fail ("internal error in type::to_array()");
jclass k = klass->getclass (verifier);
return type (_Jv_GetArrayClass (k, k->getClassLoaderInternal()),
verifier);
}
bool isreference () const
{
return key >= reference_type;
}
int get_pc () const
{
return pc;
}
bool isinitialized () const
{
return key == reference_type || key == null_type;
}
bool isresolved () const
{
return (key == reference_type
|| key == null_type
|| key == uninitialized_reference_type);
}
void verify_dimensions (int ndims, _Jv_BytecodeVerifier *verifier)
{
if (key != reference_type)
verifier->verify_fail ("internal error in verify_dimensions:"
" not a reference type");
if (klass->count_dimensions () < ndims)
verifier->verify_fail ("array type has fewer dimensions"
" than required");
}
bool merge (type& old_type, bool local_semantics,
_Jv_BytecodeVerifier *verifier)
{
bool changed = false;
bool refo = old_type.isreference ();
bool refn = isreference ();
if (refo && refn)
{
if (old_type.key == null_type)
;
else if (key == null_type)
{
*this = old_type;
changed = true;
}
else if (isinitialized () != old_type.isinitialized ())
verifier->verify_fail ("merging initialized and uninitialized types");
else
{
if (! isinitialized ())
{
if (pc == UNINIT)
pc = old_type.pc;
else if (old_type.pc == UNINIT)
;
else if (pc != old_type.pc)
verifier->verify_fail ("merging different uninitialized types");
}
ref_intersection *merged = old_type.klass->merge (klass,
verifier);
if (merged != klass)
{
klass = merged;
changed = true;
}
}
}
else if (refo || refn || key != old_type.key)
{
if (local_semantics)
{
if (key != unsuitable_type)
{
key = unsuitable_type;
changed = true;
}
}
else
verifier->verify_fail ("unmergeable type");
}
return changed;
}
#ifdef VERIFY_DEBUG
void print (void) const
{
char c = '?';
switch (key)
{
case boolean_type: c = 'Z'; break;
case byte_type: c = 'B'; break;
case char_type: c = 'C'; break;
case short_type: c = 'S'; break;
case int_type: c = 'I'; break;
case long_type: c = 'J'; break;
case float_type: c = 'F'; break;
case double_type: c = 'D'; break;
case void_type: c = 'V'; break;
case unsuitable_type: c = '-'; break;
case return_address_type: c = 'r'; break;
case continuation_type: c = '+'; break;
case reference_type: c = 'L'; break;
case null_type: c = '@'; break;
case uninitialized_reference_type: c = 'U'; break;
}
debug_print ("%c", c);
}
#endif
};
struct state
{
int stacktop;
int stackdepth;
type *stack;
type *locals;
type this_type;
int pc;
state *next;
static const int NO_NEXT = -1;
state ()
: this_type ()
{
stack = NULL;
locals = NULL;
next = INVALID_STATE;
}
state (int max_stack, int max_locals)
: this_type ()
{
stacktop = 0;
stackdepth = 0;
stack = new type[max_stack];
for (int i = 0; i < max_stack; ++i)
stack[i] = unsuitable_type;
locals = new type[max_locals];
for (int i = 0; i < max_locals; ++i)
locals[i] = unsuitable_type;
pc = NO_NEXT;
next = INVALID_STATE;
}
state (const state *orig, int max_stack, int max_locals)
{
stack = new type[max_stack];
locals = new type[max_locals];
copy (orig, max_stack, max_locals);
pc = NO_NEXT;
next = INVALID_STATE;
}
~state ()
{
if (stack)
delete[] stack;
if (locals)
delete[] locals;
}
void *operator new[] (size_t bytes)
{
return _Jv_Malloc (bytes);
}
void operator delete[] (void *mem)
{
_Jv_Free (mem);
}
void *operator new (size_t bytes)
{
return _Jv_Malloc (bytes);
}
void operator delete (void *mem)
{
_Jv_Free (mem);
}
void copy (const state *copy, int max_stack, int max_locals)
{
stacktop = copy->stacktop;
stackdepth = copy->stackdepth;
for (int i = 0; i < max_stack; ++i)
stack[i] = copy->stack[i];
for (int i = 0; i < max_locals; ++i)
locals[i] = copy->locals[i];
this_type = copy->this_type;
}
void set_exception (type t, int max_stack)
{
stackdepth = 1;
stacktop = 1;
stack[0] = t;
for (int i = stacktop; i < max_stack; ++i)
stack[i] = unsuitable_type;
}
inline int get_pc () const
{
return pc;
}
void set_pc (int npc)
{
pc = npc;
}
bool merge (state *state_old, int max_locals,
_Jv_BytecodeVerifier *verifier)
{
bool changed = false;
if (this_type.isinitialized ())
this_type = state_old->this_type;
if (state_old->stacktop != stacktop) verifier->verify_fail ("stack sizes differ");
for (int i = 0; i < state_old->stacktop; ++i)
{
if (stack[i].merge (state_old->stack[i], false, verifier))
changed = true;
}
for (int i = 0; i < max_locals; ++i)
{
if (locals[i].merge (state_old->locals[i], true, verifier))
changed = true;
}
return changed;
}
void check_no_uninitialized_objects (int max_locals,
_Jv_BytecodeVerifier *verifier,
bool exception_semantics = false)
{
if (! exception_semantics)
{
for (int i = 0; i < stacktop; ++i)
if (stack[i].isreference () && ! stack[i].isinitialized ())
verifier->verify_fail ("uninitialized object on stack");
}
for (int i = 0; i < max_locals; ++i)
if (locals[i].isreference () && ! locals[i].isinitialized ())
verifier->verify_fail ("uninitialized object in local variable");
check_this_initialized (verifier);
}
void check_this_initialized (_Jv_BytecodeVerifier *verifier)
{
if (this_type.isreference () && ! this_type.isinitialized ())
verifier->verify_fail ("`this' is uninitialized");
}
void set_this_type (const type &k)
{
this_type = k;
}
void set_initialized (int pc, int max_locals)
{
for (int i = 0; i < stacktop; ++i)
stack[i].set_initialized (pc);
for (int i = 0; i < max_locals; ++i)
locals[i].set_initialized (pc);
this_type.set_initialized (pc);
}
bool state_mergeable_p (state *other, int max_locals,
_Jv_BytecodeVerifier *verifier)
{
if (stacktop != other->stacktop)
verifier->verify_fail ("stack sizes differ");
for (int i = 0; i < stacktop; ++i)
if (! stack[i].state_mergeable_p (other->stack[i]))
return false;
for (int i = 0; i < max_locals; ++i)
if (! locals[i].state_mergeable_p (other->locals[i]))
return false;
return true;
}
void reverify (_Jv_BytecodeVerifier *verifier)
{
if (next == INVALID_STATE)
{
next = verifier->next_verify_state;
verifier->next_verify_state = this;
}
}
#ifdef VERIFY_DEBUG
void print (const char *leader, int pc,
int max_stack, int max_locals) const
{
debug_print ("%s [%4d]: [stack] ", leader, pc);
int i;
for (i = 0; i < stacktop; ++i)
stack[i].print ();
for (; i < max_stack; ++i)
debug_print (".");
debug_print (" [local] ");
for (i = 0; i < max_locals; ++i)
locals[i].print ();
debug_print (" | %p\n", this);
}
#else
inline void print (const char *, int, int, int) const
{
}
#endif
};
type pop_raw ()
{
if (current_state->stacktop <= 0)
verify_fail ("stack empty");
type r = current_state->stack[--current_state->stacktop];
current_state->stackdepth -= r.depth ();
if (current_state->stackdepth < 0)
verify_fail ("stack empty", start_PC);
return r;
}
type pop32 ()
{
type r = pop_raw ();
if (r.iswide ())
verify_fail ("narrow pop of wide type");
return r;
}
type pop_type (type match)
{
match.promote ();
type t = pop_raw ();
if (! match.compatible (t, this))
verify_fail ("incompatible type on stack");
return t;
}
type pop_init_ref (type match)
{
type t = pop_raw ();
if (t.isreference () && ! t.isinitialized ())
verify_fail ("initialized reference required");
else if (! match.compatible (t, this))
verify_fail ("incompatible type on stack");
return t;
}
type pop_ref_or_return ()
{
type t = pop_raw ();
if (! t.isreference () && t.key != return_address_type)
verify_fail ("expected reference or return address on stack");
return t;
}
void push_type (type t)
{
t.promote ();
int depth = t.depth ();
if (current_state->stackdepth + depth > current_method->max_stack)
verify_fail ("stack overflow");
current_state->stack[current_state->stacktop++] = t;
current_state->stackdepth += depth;
}
void set_variable (int index, type t)
{
t.promote ();
int depth = t.depth ();
if (index > current_method->max_locals - depth)
verify_fail ("invalid local variable");
current_state->locals[index] = t;
if (depth == 2)
current_state->locals[index + 1] = continuation_type;
if (index > 0 && current_state->locals[index - 1].iswide ())
current_state->locals[index - 1] = unsuitable_type;
}
type get_variable (int index, type t)
{
int depth = t.depth ();
if (index > current_method->max_locals - depth)
verify_fail ("invalid local variable");
if (! t.compatible (current_state->locals[index], this))
verify_fail ("incompatible type in local variable");
if (depth == 2)
{
type t (continuation_type);
if (! current_state->locals[index + 1].compatible (t, this))
verify_fail ("invalid local variable");
}
return current_state->locals[index];
}
type require_array_type (type array, type element)
{
if (array.isnull ())
return element.isreference () ? type (null_type) : element;
if (! array.isarray ())
verify_fail ("array required");
type t = array.element_type (this);
if (! element.compatible (t, this))
{
bool ok = true;
if (element.key == byte_type)
{
type e2 (boolean_type);
ok = e2.compatible (t, this);
}
if (! ok)
verify_fail ("incompatible array element type");
}
return t;
}
jint get_byte ()
{
if (PC >= current_method->code_length)
verify_fail ("premature end of bytecode");
return (jint) bytecode[PC++] & 0xff;
}
jint get_ushort ()
{
jint b1 = get_byte ();
jint b2 = get_byte ();
return (jint) ((b1 << 8) | b2) & 0xffff;
}
jint get_short ()
{
jint b1 = get_byte ();
jint b2 = get_byte ();
jshort s = (b1 << 8) | b2;
return (jint) s;
}
jint get_int ()
{
jint b1 = get_byte ();
jint b2 = get_byte ();
jint b3 = get_byte ();
jint b4 = get_byte ();
return (b1 << 24) | (b2 << 16) | (b3 << 8) | b4;
}
int compute_jump (int offset)
{
int npc = start_PC + offset;
if (npc < 0 || npc >= current_method->code_length)
verify_fail ("branch out of range", start_PC);
return npc;
}
state *add_new_state (int npc, state *old_state)
{
state *new_state = new state (old_state, current_method->max_stack,
current_method->max_locals);
debug_print ("== New state in add_new_state\n");
new_state->print ("New", npc, current_method->max_stack,
current_method->max_locals);
linked<state> *nlink
= (linked<state> *) _Jv_Malloc (sizeof (linked<state>));
nlink->val = new_state;
nlink->next = states[npc];
states[npc] = nlink;
new_state->set_pc (npc);
return new_state;
}
void merge_into (int npc, state *from_state)
{
bool applicable = false;
for (linked<state> *iter = states[npc]; iter != NULL; iter = iter->next)
{
state *new_state = iter->val;
if (new_state->state_mergeable_p (from_state,
current_method->max_locals, this))
{
applicable = true;
debug_print ("== Merge states in merge_into\n");
from_state->print ("Frm", start_PC, current_method->max_stack,
current_method->max_locals);
new_state->print (" To", npc, current_method->max_stack,
current_method->max_locals);
bool changed = new_state->merge (from_state,
current_method->max_locals,
this);
new_state->print ("New", npc, current_method->max_stack,
current_method->max_locals);
if (changed)
new_state->reverify (this);
}
}
if (! applicable)
{
state *new_state = add_new_state (npc, from_state);
new_state->reverify (this);
}
}
void push_jump (int offset)
{
int npc = compute_jump (offset);
if (npc < PC)
current_state->check_no_uninitialized_objects (current_method->max_locals, this);
merge_into (npc, current_state);
}
void push_exception_jump (type t, int pc)
{
current_state->check_no_uninitialized_objects (current_method->max_locals,
this, true);
state s (current_state, current_method->max_stack,
current_method->max_locals);
if (current_method->max_stack < 1)
verify_fail ("stack overflow at exception handler");
s.set_exception (t, current_method->max_stack);
merge_into (pc, &s);
}
state *pop_jump ()
{
state *new_state = next_verify_state;
if (new_state == INVALID_STATE)
verify_fail ("programmer error in pop_jump");
if (new_state != NULL)
{
next_verify_state = new_state->next;
new_state->next = INVALID_STATE;
}
return new_state;
}
void invalidate_pc ()
{
PC = state::NO_NEXT;
}
void note_branch_target (int pc)
{
if (pc < PC && ! (flags[pc] & FLAG_INSN_START))
verify_fail ("branch not to instruction start", start_PC);
flags[pc] |= FLAG_BRANCH_TARGET;
}
void skip_padding ()
{
while ((PC % 4) > 0)
if (get_byte () != 0)
verify_fail ("found nonzero padding byte");
}
void handle_ret_insn (int index)
{
type ret_addr = get_variable (index, return_address_type);
int npc = ret_addr.get_pc ();
if (npc >= current_method->code_length)
verify_fail ("fell off end");
if (npc < PC)
current_state->check_no_uninitialized_objects (current_method->max_locals,
this);
merge_into (npc, current_state);
invalidate_pc ();
}
void handle_jsr_insn (int offset)
{
int npc = compute_jump (offset);
if (npc < PC)
current_state->check_no_uninitialized_objects (current_method->max_locals, this);
type ret_addr (return_address_type);
ret_addr.set_return_address (PC);
push_type (ret_addr);
merge_into (npc, current_state);
invalidate_pc ();
}
jclass construct_primitive_array_type (type_val prim)
{
jclass k = NULL;
switch (prim)
{
case boolean_type:
k = JvPrimClass (boolean);
break;
case char_type:
k = JvPrimClass (char);
break;
case float_type:
k = JvPrimClass (float);
break;
case double_type:
k = JvPrimClass (double);
break;
case byte_type:
k = JvPrimClass (byte);
break;
case short_type:
k = JvPrimClass (short);
break;
case int_type:
k = JvPrimClass (int);
break;
case long_type:
k = JvPrimClass (long);
break;
case void_type:
case unsuitable_type:
case return_address_type:
case continuation_type:
case reference_type:
case null_type:
case uninitialized_reference_type:
default:
verify_fail ("unknown type in construct_primitive_array_type");
}
k = _Jv_GetArrayClass (k, NULL);
return k;
}
void branch_prepass ()
{
flags = (char *) _Jv_Malloc (current_method->code_length);
for (int i = 0; i < current_method->code_length; ++i)
flags[i] = 0;
PC = 0;
while (PC < current_method->code_length)
{
start_PC = PC;
flags[PC] |= FLAG_INSN_START;
java_opcode opcode = (java_opcode) bytecode[PC++];
switch (opcode)
{
case op_nop:
case op_aconst_null:
case op_iconst_m1:
case op_iconst_0:
case op_iconst_1:
case op_iconst_2:
case op_iconst_3:
case op_iconst_4:
case op_iconst_5:
case op_lconst_0:
case op_lconst_1:
case op_fconst_0:
case op_fconst_1:
case op_fconst_2:
case op_dconst_0:
case op_dconst_1:
case op_iload_0:
case op_iload_1:
case op_iload_2:
case op_iload_3:
case op_lload_0:
case op_lload_1:
case op_lload_2:
case op_lload_3:
case op_fload_0:
case op_fload_1:
case op_fload_2:
case op_fload_3:
case op_dload_0:
case op_dload_1:
case op_dload_2:
case op_dload_3:
case op_aload_0:
case op_aload_1:
case op_aload_2:
case op_aload_3:
case op_iaload:
case op_laload:
case op_faload:
case op_daload:
case op_aaload:
case op_baload:
case op_caload:
case op_saload:
case op_istore_0:
case op_istore_1:
case op_istore_2:
case op_istore_3:
case op_lstore_0:
case op_lstore_1:
case op_lstore_2:
case op_lstore_3:
case op_fstore_0:
case op_fstore_1:
case op_fstore_2:
case op_fstore_3:
case op_dstore_0:
case op_dstore_1:
case op_dstore_2:
case op_dstore_3:
case op_astore_0:
case op_astore_1:
case op_astore_2:
case op_astore_3:
case op_iastore:
case op_lastore:
case op_fastore:
case op_dastore:
case op_aastore:
case op_bastore:
case op_castore:
case op_sastore:
case op_pop:
case op_pop2:
case op_dup:
case op_dup_x1:
case op_dup_x2:
case op_dup2:
case op_dup2_x1:
case op_dup2_x2:
case op_swap:
case op_iadd:
case op_isub:
case op_imul:
case op_idiv:
case op_irem:
case op_ishl:
case op_ishr:
case op_iushr:
case op_iand:
case op_ior:
case op_ixor:
case op_ladd:
case op_lsub:
case op_lmul:
case op_ldiv:
case op_lrem:
case op_lshl:
case op_lshr:
case op_lushr:
case op_land:
case op_lor:
case op_lxor:
case op_fadd:
case op_fsub:
case op_fmul:
case op_fdiv:
case op_frem:
case op_dadd:
case op_dsub:
case op_dmul:
case op_ddiv:
case op_drem:
case op_ineg:
case op_i2b:
case op_i2c:
case op_i2s:
case op_lneg:
case op_fneg:
case op_dneg:
case op_i2l:
case op_i2f:
case op_i2d:
case op_l2i:
case op_l2f:
case op_l2d:
case op_f2i:
case op_f2l:
case op_f2d:
case op_d2i:
case op_d2l:
case op_d2f:
case op_lcmp:
case op_fcmpl:
case op_fcmpg:
case op_dcmpl:
case op_dcmpg:
case op_monitorenter:
case op_monitorexit:
case op_ireturn:
case op_lreturn:
case op_freturn:
case op_dreturn:
case op_areturn:
case op_return:
case op_athrow:
case op_arraylength:
break;
case op_bipush:
case op_ldc:
case op_iload:
case op_lload:
case op_fload:
case op_dload:
case op_aload:
case op_istore:
case op_lstore:
case op_fstore:
case op_dstore:
case op_astore:
case op_ret:
case op_newarray:
get_byte ();
break;
case op_iinc:
case op_sipush:
case op_ldc_w:
case op_ldc2_w:
case op_getstatic:
case op_getfield:
case op_putfield:
case op_putstatic:
case op_new:
case op_anewarray:
case op_instanceof:
case op_checkcast:
case op_invokespecial:
case op_invokestatic:
case op_invokevirtual:
get_short ();
break;
case op_multianewarray:
get_short ();
get_byte ();
break;
case op_jsr:
case op_ifeq:
case op_ifne:
case op_iflt:
case op_ifge:
case op_ifgt:
case op_ifle:
case op_if_icmpeq:
case op_if_icmpne:
case op_if_icmplt:
case op_if_icmpge:
case op_if_icmpgt:
case op_if_icmple:
case op_if_acmpeq:
case op_if_acmpne:
case op_ifnull:
case op_ifnonnull:
case op_goto:
note_branch_target (compute_jump (get_short ()));
break;
case op_tableswitch:
{
skip_padding ();
note_branch_target (compute_jump (get_int ()));
jint low = get_int ();
jint hi = get_int ();
if (low > hi)
verify_fail ("invalid tableswitch", start_PC);
for (int i = low; i <= hi; ++i)
note_branch_target (compute_jump (get_int ()));
}
break;
case op_lookupswitch:
{
skip_padding ();
note_branch_target (compute_jump (get_int ()));
int npairs = get_int ();
if (npairs < 0)
verify_fail ("too few pairs in lookupswitch", start_PC);
while (npairs-- > 0)
{
get_int ();
note_branch_target (compute_jump (get_int ()));
}
}
break;
case op_invokeinterface:
get_short ();
get_byte ();
get_byte ();
break;
case op_wide:
{
opcode = (java_opcode) get_byte ();
get_short ();
if (opcode == op_iinc)
get_short ();
}
break;
case op_jsr_w:
case op_goto_w:
note_branch_target (compute_jump (get_int ()));
break;
case op_putfield_1:
case op_putfield_2:
case op_putfield_4:
case op_putfield_8:
case op_putfield_a:
case op_putstatic_1:
case op_putstatic_2:
case op_putstatic_4:
case op_putstatic_8:
case op_putstatic_a:
case op_getfield_1:
case op_getfield_2s:
case op_getfield_2u:
case op_getfield_4:
case op_getfield_8:
case op_getfield_a:
case op_getstatic_1:
case op_getstatic_2s:
case op_getstatic_2u:
case op_getstatic_4:
case op_getstatic_8:
case op_getstatic_a:
default:
verify_fail ("unrecognized instruction in branch_prepass",
start_PC);
}
for (int pc = start_PC + 1; pc < PC; ++pc)
{
if ((flags[pc] & FLAG_BRANCH_TARGET))
verify_fail ("branch to middle of instruction", pc);
}
}
for (int i = 0; i < current_method->exc_count; ++i)
{
if (! (flags[exception[i].handler_pc.i] & FLAG_INSN_START))
verify_fail ("exception handler not at instruction start",
exception[i].handler_pc.i);
if (! (flags[exception[i].start_pc.i] & FLAG_INSN_START))
verify_fail ("exception start not at instruction start",
exception[i].start_pc.i);
if (exception[i].end_pc.i != current_method->code_length
&& ! (flags[exception[i].end_pc.i] & FLAG_INSN_START))
verify_fail ("exception end not at instruction start",
exception[i].end_pc.i);
flags[exception[i].handler_pc.i] |= FLAG_BRANCH_TARGET;
}
}
void check_pool_index (int index)
{
if (index < 0 || index >= current_class->constants.size)
verify_fail ("constant pool index out of range", start_PC);
}
type check_class_constant (int index)
{
check_pool_index (index);
_Jv_Constants *pool = ¤t_class->constants;
if (pool->tags[index] == JV_CONSTANT_ResolvedClass)
return type (pool->data[index].clazz, this);
else if (pool->tags[index] == JV_CONSTANT_Class)
return type (pool->data[index].utf8, this);
verify_fail ("expected class constant", start_PC);
}
type check_constant (int index)
{
check_pool_index (index);
_Jv_Constants *pool = ¤t_class->constants;
if (pool->tags[index] == JV_CONSTANT_ResolvedString
|| pool->tags[index] == JV_CONSTANT_String)
return type (&java::lang::String::class$, this);
else if (pool->tags[index] == JV_CONSTANT_Integer)
return type (int_type);
else if (pool->tags[index] == JV_CONSTANT_Float)
return type (float_type);
verify_fail ("String, int, or float constant expected", start_PC);
}
type check_wide_constant (int index)
{
check_pool_index (index);
_Jv_Constants *pool = ¤t_class->constants;
if (pool->tags[index] == JV_CONSTANT_Long)
return type (long_type);
else if (pool->tags[index] == JV_CONSTANT_Double)
return type (double_type);
verify_fail ("long or double constant expected", start_PC);
}
type handle_field_or_method (int index, int expected,
_Jv_Utf8Const **name,
_Jv_Utf8Const **fmtype)
{
check_pool_index (index);
_Jv_Constants *pool = ¤t_class->constants;
if (pool->tags[index] != expected)
verify_fail ("didn't see expected constant", start_PC);
_Jv_ushort class_index, name_and_type_index;
_Jv_loadIndexes (&pool->data[index],
class_index,
name_and_type_index);
_Jv_ushort name_index, desc_index;
_Jv_loadIndexes (&pool->data[name_and_type_index],
name_index, desc_index);
*name = pool->data[name_index].utf8;
*fmtype = pool->data[desc_index].utf8;
return check_class_constant (class_index);
}
type check_field_constant (int index, type *class_type = NULL)
{
_Jv_Utf8Const *name, *field_type;
type ct = handle_field_or_method (index,
JV_CONSTANT_Fieldref,
&name, &field_type);
if (class_type)
*class_type = ct;
if (field_type->first() == '[' || field_type->first() == 'L')
return type (field_type, this);
return get_type_val_for_signature (field_type->first());
}
type check_method_constant (int index, bool is_interface,
_Jv_Utf8Const **method_name,
_Jv_Utf8Const **method_signature)
{
return handle_field_or_method (index,
(is_interface
? JV_CONSTANT_InterfaceMethodref
: JV_CONSTANT_Methodref),
method_name, method_signature);
}
type get_one_type (char *&p)
{
char *start = p;
int arraycount = 0;
while (*p == '[')
{
++arraycount;
++p;
}
char v = *p++;
if (v == 'L')
{
while (*p != ';')
++p;
++p;
_Jv_Utf8Const *name = make_utf8_const (start, p - start);
return type (name, this);
}
type_val rt = get_type_val_for_signature (jchar (v));
if (arraycount == 0)
{
return type (rt).promote ();
}
jclass k = construct_primitive_array_type (rt);
while (--arraycount > 0)
k = _Jv_GetArrayClass (k, NULL);
return type (k, this);
}
void compute_argument_types (_Jv_Utf8Const *signature,
type *types)
{
char *p = signature->chars();
++p;
int i = 0;
while (*p != ')')
types[i++] = get_one_type (p);
}
type compute_return_type (_Jv_Utf8Const *signature)
{
char *p = signature->chars();
while (*p != ')')
++p;
++p;
return get_one_type (p);
}
void check_return_type (type onstack)
{
type rt = compute_return_type (current_method->self->signature);
if (! rt.compatible (onstack, this))
verify_fail ("incompatible return type");
}
bool initialize_stack ()
{
int var = 0;
bool is_init = _Jv_equalUtf8Consts (current_method->self->name,
gcj::init_name);
bool is_clinit = _Jv_equalUtf8Consts (current_method->self->name,
gcj::clinit_name);
using namespace java::lang::reflect;
if (! Modifier::isStatic (current_method->self->accflags))
{
type kurr (current_class, this);
if (is_init)
{
kurr.set_uninitialized (type::SELF, this);
is_init = true;
}
else if (is_clinit)
verify_fail ("<clinit> method must be static");
set_variable (0, kurr);
current_state->set_this_type (kurr);
++var;
}
else
{
if (is_init)
verify_fail ("<init> method must be non-static");
}
int arg_count = _Jv_count_arguments (current_method->self->signature);
type arg_types[arg_count];
compute_argument_types (current_method->self->signature, arg_types);
for (int i = 0; i < arg_count; ++i)
{
set_variable (var, arg_types[i]);
++var;
if (arg_types[i].iswide ())
++var;
}
return is_init;
}
void verify_instructions_0 ()
{
current_state = new state (current_method->max_stack,
current_method->max_locals);
PC = 0;
start_PC = 0;
bool this_is_init = initialize_stack ();
states = (linked<state> **) _Jv_Malloc (sizeof (linked<state> *)
* current_method->code_length);
for (int i = 0; i < current_method->code_length; ++i)
states[i] = NULL;
next_verify_state = NULL;
while (true)
{
if (PC == state::NO_NEXT)
{
state *new_state = pop_jump ();
if (new_state == NULL)
break;
PC = new_state->get_pc ();
debug_print ("== State pop from pending list\n");
current_state->copy (new_state, current_method->max_stack,
current_method->max_locals);
}
else
{
if (states[PC] != NULL)
{
merge_into (PC, current_state);
invalidate_pc ();
continue;
}
}
if (PC >= current_method->code_length)
verify_fail ("fell off end");
if (states[PC] == NULL && (flags[PC] & FLAG_BRANCH_TARGET))
add_new_state (PC, current_state);
start_PC = PC;
for (int i = 0; i < current_method->exc_count; ++i)
{
if (PC >= exception[i].start_pc.i && PC < exception[i].end_pc.i)
{
type handler (&java::lang::Throwable::class$, this);
if (exception[i].handler_type.i != 0)
handler = check_class_constant (exception[i].handler_type.i);
push_exception_jump (handler, exception[i].handler_pc.i);
}
}
current_state->print (" ", PC, current_method->max_stack,
current_method->max_locals);
java_opcode opcode = (java_opcode) bytecode[PC++];
switch (opcode)
{
case op_nop:
break;
case op_aconst_null:
push_type (null_type);
break;
case op_iconst_m1:
case op_iconst_0:
case op_iconst_1:
case op_iconst_2:
case op_iconst_3:
case op_iconst_4:
case op_iconst_5:
push_type (int_type);
break;
case op_lconst_0:
case op_lconst_1:
push_type (long_type);
break;
case op_fconst_0:
case op_fconst_1:
case op_fconst_2:
push_type (float_type);
break;
case op_dconst_0:
case op_dconst_1:
push_type (double_type);
break;
case op_bipush:
get_byte ();
push_type (int_type);
break;
case op_sipush:
get_short ();
push_type (int_type);
break;
case op_ldc:
push_type (check_constant (get_byte ()));
break;
case op_ldc_w:
push_type (check_constant (get_ushort ()));
break;
case op_ldc2_w:
push_type (check_wide_constant (get_ushort ()));
break;
case op_iload:
push_type (get_variable (get_byte (), int_type));
break;
case op_lload:
push_type (get_variable (get_byte (), long_type));
break;
case op_fload:
push_type (get_variable (get_byte (), float_type));
break;
case op_dload:
push_type (get_variable (get_byte (), double_type));
break;
case op_aload:
push_type (get_variable (get_byte (), reference_type));
break;
case op_iload_0:
case op_iload_1:
case op_iload_2:
case op_iload_3:
push_type (get_variable (opcode - op_iload_0, int_type));
break;
case op_lload_0:
case op_lload_1:
case op_lload_2:
case op_lload_3:
push_type (get_variable (opcode - op_lload_0, long_type));
break;
case op_fload_0:
case op_fload_1:
case op_fload_2:
case op_fload_3:
push_type (get_variable (opcode - op_fload_0, float_type));
break;
case op_dload_0:
case op_dload_1:
case op_dload_2:
case op_dload_3:
push_type (get_variable (opcode - op_dload_0, double_type));
break;
case op_aload_0:
case op_aload_1:
case op_aload_2:
case op_aload_3:
push_type (get_variable (opcode - op_aload_0, reference_type));
break;
case op_iaload:
pop_type (int_type);
push_type (require_array_type (pop_init_ref (reference_type),
int_type));
break;
case op_laload:
pop_type (int_type);
push_type (require_array_type (pop_init_ref (reference_type),
long_type));
break;
case op_faload:
pop_type (int_type);
push_type (require_array_type (pop_init_ref (reference_type),
float_type));
break;
case op_daload:
pop_type (int_type);
push_type (require_array_type (pop_init_ref (reference_type),
double_type));
break;
case op_aaload:
pop_type (int_type);
push_type (require_array_type (pop_init_ref (reference_type),
reference_type));
break;
case op_baload:
pop_type (int_type);
require_array_type (pop_init_ref (reference_type), byte_type);
push_type (int_type);
break;
case op_caload:
pop_type (int_type);
require_array_type (pop_init_ref (reference_type), char_type);
push_type (int_type);
break;
case op_saload:
pop_type (int_type);
require_array_type (pop_init_ref (reference_type), short_type);
push_type (int_type);
break;
case op_istore:
set_variable (get_byte (), pop_type (int_type));
break;
case op_lstore:
set_variable (get_byte (), pop_type (long_type));
break;
case op_fstore:
set_variable (get_byte (), pop_type (float_type));
break;
case op_dstore:
set_variable (get_byte (), pop_type (double_type));
break;
case op_astore:
set_variable (get_byte (), pop_ref_or_return ());
break;
case op_istore_0:
case op_istore_1:
case op_istore_2:
case op_istore_3:
set_variable (opcode - op_istore_0, pop_type (int_type));
break;
case op_lstore_0:
case op_lstore_1:
case op_lstore_2:
case op_lstore_3:
set_variable (opcode - op_lstore_0, pop_type (long_type));
break;
case op_fstore_0:
case op_fstore_1:
case op_fstore_2:
case op_fstore_3:
set_variable (opcode - op_fstore_0, pop_type (float_type));
break;
case op_dstore_0:
case op_dstore_1:
case op_dstore_2:
case op_dstore_3:
set_variable (opcode - op_dstore_0, pop_type (double_type));
break;
case op_astore_0:
case op_astore_1:
case op_astore_2:
case op_astore_3:
set_variable (opcode - op_astore_0, pop_ref_or_return ());
break;
case op_iastore:
pop_type (int_type);
pop_type (int_type);
require_array_type (pop_init_ref (reference_type), int_type);
break;
case op_lastore:
pop_type (long_type);
pop_type (int_type);
require_array_type (pop_init_ref (reference_type), long_type);
break;
case op_fastore:
pop_type (float_type);
pop_type (int_type);
require_array_type (pop_init_ref (reference_type), float_type);
break;
case op_dastore:
pop_type (double_type);
pop_type (int_type);
require_array_type (pop_init_ref (reference_type), double_type);
break;
case op_aastore:
pop_type (reference_type);
pop_type (int_type);
require_array_type (pop_init_ref (reference_type), reference_type);
break;
case op_bastore:
pop_type (int_type);
pop_type (int_type);
require_array_type (pop_init_ref (reference_type), byte_type);
break;
case op_castore:
pop_type (int_type);
pop_type (int_type);
require_array_type (pop_init_ref (reference_type), char_type);
break;
case op_sastore:
pop_type (int_type);
pop_type (int_type);
require_array_type (pop_init_ref (reference_type), short_type);
break;
case op_pop:
pop32 ();
break;
case op_pop2:
{
type t = pop_raw ();
if (! t.iswide ())
pop32 ();
}
break;
case op_dup:
{
type t = pop32 ();
push_type (t);
push_type (t);
}
break;
case op_dup_x1:
{
type t1 = pop32 ();
type t2 = pop32 ();
push_type (t1);
push_type (t2);
push_type (t1);
}
break;
case op_dup_x2:
{
type t1 = pop32 ();
type t2 = pop_raw ();
if (! t2.iswide ())
{
type t3 = pop32 ();
push_type (t1);
push_type (t3);
}
else
push_type (t1);
push_type (t2);
push_type (t1);
}
break;
case op_dup2:
{
type t = pop_raw ();
if (! t.iswide ())
{
type t2 = pop32 ();
push_type (t2);
push_type (t);
push_type (t2);
}
else
push_type (t);
push_type (t);
}
break;
case op_dup2_x1:
{
type t1 = pop_raw ();
type t2 = pop32 ();
if (! t1.iswide ())
{
type t3 = pop32 ();
push_type (t2);
push_type (t1);
push_type (t3);
}
else
push_type (t1);
push_type (t2);
push_type (t1);
}
break;
case op_dup2_x2:
{
type t1 = pop_raw ();
if (t1.iswide ())
{
type t2 = pop_raw ();
if (t2.iswide ())
{
push_type (t1);
push_type (t2);
}
else
{
type t3 = pop32 ();
push_type (t1);
push_type (t3);
push_type (t2);
}
push_type (t1);
}
else
{
type t2 = pop32 ();
type t3 = pop_raw ();
if (t3.iswide ())
{
push_type (t2);
push_type (t1);
}
else
{
type t4 = pop32 ();
push_type (t2);
push_type (t1);
push_type (t4);
}
push_type (t3);
push_type (t2);
push_type (t1);
}
}
break;
case op_swap:
{
type t1 = pop32 ();
type t2 = pop32 ();
push_type (t1);
push_type (t2);
}
break;
case op_iadd:
case op_isub:
case op_imul:
case op_idiv:
case op_irem:
case op_ishl:
case op_ishr:
case op_iushr:
case op_iand:
case op_ior:
case op_ixor:
pop_type (int_type);
push_type (pop_type (int_type));
break;
case op_ladd:
case op_lsub:
case op_lmul:
case op_ldiv:
case op_lrem:
case op_land:
case op_lor:
case op_lxor:
pop_type (long_type);
push_type (pop_type (long_type));
break;
case op_lshl:
case op_lshr:
case op_lushr:
pop_type (int_type);
push_type (pop_type (long_type));
break;
case op_fadd:
case op_fsub:
case op_fmul:
case op_fdiv:
case op_frem:
pop_type (float_type);
push_type (pop_type (float_type));
break;
case op_dadd:
case op_dsub:
case op_dmul:
case op_ddiv:
case op_drem:
pop_type (double_type);
push_type (pop_type (double_type));
break;
case op_ineg:
case op_i2b:
case op_i2c:
case op_i2s:
push_type (pop_type (int_type));
break;
case op_lneg:
push_type (pop_type (long_type));
break;
case op_fneg:
push_type (pop_type (float_type));
break;
case op_dneg:
push_type (pop_type (double_type));
break;
case op_iinc:
get_variable (get_byte (), int_type);
get_byte ();
break;
case op_i2l:
pop_type (int_type);
push_type (long_type);
break;
case op_i2f:
pop_type (int_type);
push_type (float_type);
break;
case op_i2d:
pop_type (int_type);
push_type (double_type);
break;
case op_l2i:
pop_type (long_type);
push_type (int_type);
break;
case op_l2f:
pop_type (long_type);
push_type (float_type);
break;
case op_l2d:
pop_type (long_type);
push_type (double_type);
break;
case op_f2i:
pop_type (float_type);
push_type (int_type);
break;
case op_f2l:
pop_type (float_type);
push_type (long_type);
break;
case op_f2d:
pop_type (float_type);
push_type (double_type);
break;
case op_d2i:
pop_type (double_type);
push_type (int_type);
break;
case op_d2l:
pop_type (double_type);
push_type (long_type);
break;
case op_d2f:
pop_type (double_type);
push_type (float_type);
break;
case op_lcmp:
pop_type (long_type);
pop_type (long_type);
push_type (int_type);
break;
case op_fcmpl:
case op_fcmpg:
pop_type (float_type);
pop_type (float_type);
push_type (int_type);
break;
case op_dcmpl:
case op_dcmpg:
pop_type (double_type);
pop_type (double_type);
push_type (int_type);
break;
case op_ifeq:
case op_ifne:
case op_iflt:
case op_ifge:
case op_ifgt:
case op_ifle:
pop_type (int_type);
push_jump (get_short ());
break;
case op_if_icmpeq:
case op_if_icmpne:
case op_if_icmplt:
case op_if_icmpge:
case op_if_icmpgt:
case op_if_icmple:
pop_type (int_type);
pop_type (int_type);
push_jump (get_short ());
break;
case op_if_acmpeq:
case op_if_acmpne:
pop_type (reference_type);
pop_type (reference_type);
push_jump (get_short ());
break;
case op_goto:
push_jump (get_short ());
invalidate_pc ();
break;
case op_jsr:
handle_jsr_insn (get_short ());
break;
case op_ret:
handle_ret_insn (get_byte ());
break;
case op_tableswitch:
{
pop_type (int_type);
skip_padding ();
push_jump (get_int ());
jint low = get_int ();
jint high = get_int ();
for (int i = low; i <= high; ++i)
push_jump (get_int ());
invalidate_pc ();
}
break;
case op_lookupswitch:
{
pop_type (int_type);
skip_padding ();
push_jump (get_int ());
jint npairs = get_int ();
jint lastkey = 0;
for (int i = 0; i < npairs; ++i)
{
jint key = get_int ();
if (i > 0 && key <= lastkey)
verify_fail ("lookupswitch pairs unsorted", start_PC);
lastkey = key;
push_jump (get_int ());
}
invalidate_pc ();
}
break;
case op_ireturn:
check_return_type (pop_type (int_type));
invalidate_pc ();
break;
case op_lreturn:
check_return_type (pop_type (long_type));
invalidate_pc ();
break;
case op_freturn:
check_return_type (pop_type (float_type));
invalidate_pc ();
break;
case op_dreturn:
check_return_type (pop_type (double_type));
invalidate_pc ();
break;
case op_areturn:
check_return_type (pop_init_ref (reference_type));
invalidate_pc ();
break;
case op_return:
if (this_is_init)
current_state->check_this_initialized (this);
check_return_type (void_type);
invalidate_pc ();
break;
case op_getstatic:
push_type (check_field_constant (get_ushort ()));
break;
case op_putstatic:
pop_type (check_field_constant (get_ushort ()));
break;
case op_getfield:
{
type klass;
type field = check_field_constant (get_ushort (), &klass);
pop_type (klass);
push_type (field);
}
break;
case op_putfield:
{
type klass;
type field = check_field_constant (get_ushort (), &klass);
pop_type (field);
if (! current_state->this_type.isinitialized ()
&& current_state->this_type.pc == type::SELF)
klass.set_uninitialized (type::SELF, this);
pop_type (klass);
}
break;
case op_invokevirtual:
case op_invokespecial:
case op_invokestatic:
case op_invokeinterface:
{
_Jv_Utf8Const *method_name, *method_signature;
type class_type
= check_method_constant (get_ushort (),
opcode == op_invokeinterface,
&method_name,
&method_signature);
int nargs = 0;
if (opcode == op_invokeinterface)
{
nargs = get_byte ();
if (get_byte () != 0)
verify_fail ("invokeinterface dummy byte is wrong");
}
bool is_init = false;
if (_Jv_equalUtf8Consts (method_name, gcj::init_name))
{
is_init = true;
if (opcode != op_invokespecial)
verify_fail ("can't invoke <init>");
}
else if (method_name->first() == '<')
verify_fail ("can't invoke method starting with `<'");
int arg_count = _Jv_count_arguments (method_signature);
type arg_types[arg_count];
compute_argument_types (method_signature, arg_types);
for (int i = arg_count - 1; i >= 0; --i)
{
nargs -= arg_types[i].depth ();
pop_init_ref (arg_types[i]);
}
if (opcode == op_invokeinterface
&& nargs != 1)
verify_fail ("wrong argument count for invokeinterface");
if (opcode != op_invokestatic)
{
type t = class_type;
if (is_init)
{
t.set_uninitialized (type::UNINIT, this);
}
type raw = pop_raw ();
if (! t.compatible (raw, this))
verify_fail ("incompatible type on stack");
if (is_init)
current_state->set_initialized (raw.get_pc (),
current_method->max_locals);
}
type rt = compute_return_type (method_signature);
if (! rt.isvoid ())
push_type (rt);
}
break;
case op_new:
{
type t = check_class_constant (get_ushort ());
if (t.isarray () || t.isinterface (this) || t.isabstract (this))
verify_fail ("type is array, interface, or abstract");
t.set_uninitialized (start_PC, this);
push_type (t);
}
break;
case op_newarray:
{
int atype = get_byte ();
if (atype < boolean_type || atype > long_type)
verify_fail ("type not primitive", start_PC);
pop_type (int_type);
type t (construct_primitive_array_type (type_val (atype)), this);
push_type (t);
}
break;
case op_anewarray:
pop_type (int_type);
push_type (check_class_constant (get_ushort ()).to_array (this));
break;
case op_arraylength:
{
type t = pop_init_ref (reference_type);
if (! t.isarray () && ! t.isnull ())
verify_fail ("array type expected");
push_type (int_type);
}
break;
case op_athrow:
pop_type (type (&java::lang::Throwable::class$, this));
invalidate_pc ();
break;
case op_checkcast:
pop_init_ref (reference_type);
push_type (check_class_constant (get_ushort ()));
break;
case op_instanceof:
pop_init_ref (reference_type);
check_class_constant (get_ushort ());
push_type (int_type);
break;
case op_monitorenter:
pop_init_ref (reference_type);
break;
case op_monitorexit:
pop_init_ref (reference_type);
break;
case op_wide:
{
switch (get_byte ())
{
case op_iload:
push_type (get_variable (get_ushort (), int_type));
break;
case op_lload:
push_type (get_variable (get_ushort (), long_type));
break;
case op_fload:
push_type (get_variable (get_ushort (), float_type));
break;
case op_dload:
push_type (get_variable (get_ushort (), double_type));
break;
case op_aload:
push_type (get_variable (get_ushort (), reference_type));
break;
case op_istore:
set_variable (get_ushort (), pop_type (int_type));
break;
case op_lstore:
set_variable (get_ushort (), pop_type (long_type));
break;
case op_fstore:
set_variable (get_ushort (), pop_type (float_type));
break;
case op_dstore:
set_variable (get_ushort (), pop_type (double_type));
break;
case op_astore:
set_variable (get_ushort (), pop_init_ref (reference_type));
break;
case op_ret:
handle_ret_insn (get_short ());
break;
case op_iinc:
get_variable (get_ushort (), int_type);
get_short ();
break;
default:
verify_fail ("unrecognized wide instruction", start_PC);
}
}
break;
case op_multianewarray:
{
type atype = check_class_constant (get_ushort ());
int dim = get_byte ();
if (dim < 1)
verify_fail ("too few dimensions to multianewarray", start_PC);
atype.verify_dimensions (dim, this);
for (int i = 0; i < dim; ++i)
pop_type (int_type);
push_type (atype);
}
break;
case op_ifnull:
case op_ifnonnull:
pop_type (reference_type);
push_jump (get_short ());
break;
case op_goto_w:
push_jump (get_int ());
invalidate_pc ();
break;
case op_jsr_w:
handle_jsr_insn (get_int ());
break;
case op_putfield_1:
case op_putfield_2:
case op_putfield_4:
case op_putfield_8:
case op_putfield_a:
case op_putstatic_1:
case op_putstatic_2:
case op_putstatic_4:
case op_putstatic_8:
case op_putstatic_a:
case op_getfield_1:
case op_getfield_2s:
case op_getfield_2u:
case op_getfield_4:
case op_getfield_8:
case op_getfield_a:
case op_getstatic_1:
case op_getstatic_2s:
case op_getstatic_2u:
case op_getstatic_4:
case op_getstatic_8:
case op_getstatic_a:
default:
verify_fail ("unrecognized instruction in verify_instructions_0",
start_PC);
}
}
}
public:
void verify_instructions ()
{
branch_prepass ();
verify_instructions_0 ();
}
_Jv_BytecodeVerifier (_Jv_InterpMethod *m)
{
debug_print ("--------------------------------\n");
debug_print ("-- Verifying method `%s'\n", m->self->name->chars());
current_method = m;
bytecode = m->bytecode ();
exception = m->exceptions ();
current_class = m->defining_class;
states = NULL;
flags = NULL;
utf8_list = NULL;
isect_list = NULL;
}
~_Jv_BytecodeVerifier ()
{
if (flags)
_Jv_Free (flags);
while (utf8_list != NULL)
{
linked<_Jv_Utf8Const> *n = utf8_list->next;
_Jv_Free (utf8_list);
utf8_list = n;
}
while (isect_list != NULL)
{
ref_intersection *next = isect_list->alloc_next;
delete isect_list;
isect_list = next;
}
if (states)
{
for (int i = 0; i < current_method->code_length; ++i)
{
linked<state> *iter = states[i];
while (iter != NULL)
{
linked<state> *next = iter->next;
delete iter->val;
_Jv_Free (iter);
iter = next;
}
}
_Jv_Free (states);
}
}
};
void
_Jv_VerifyMethod (_Jv_InterpMethod *meth)
{
_Jv_BytecodeVerifier v (meth);
v.verify_instructions ();
}
#endif