本文整理汇总了C++中methodHandle::constants方法的典型用法代码示例。如果您正苦于以下问题：C++ methodHandle::constants方法的具体用法？C++ methodHandle::constants怎么用？C++ methodHandle::constants使用的例子？那么恭喜您, 这里精选的方法代码示例或许可以为您提供帮助。您也可以进一步了解该方法所在类methodHandle的用法示例。
在下文中一共展示了methodHandle::constants方法的1个代码示例，这些例子默认根据受欢迎程度排序。您可以为喜欢或者感觉有用的代码点赞，您的评价将有助于系统推荐出更棒的C++代码示例。
示例1: copy_bytecodes
void JvmtiClassFileReconstituter::copy_bytecodes(methodHandle mh,
unsigned char* bytecodes) {
// use a BytecodeStream to iterate over the bytecodes. JVM/fast bytecodes
// and the breakpoint bytecode are converted to their original bytecodes.
BytecodeStream bs(mh);
unsigned char* p = bytecodes;
Bytecodes::Code code;
bool is_rewritten = mh->method_holder()->is_rewritten();
while ((code = bs.next()) >= 0) {
assert(Bytecodes::is_java_code(code), "sanity check");
assert(code != Bytecodes::_breakpoint, "sanity check");
// length of bytecode (mnemonic + operands)
address bcp = bs.bcp();
int len = bs.instruction_size();
assert(len > 0, "length must be > 0");
// copy the bytecodes
*p = (unsigned char) (bs.is_wide()? Bytecodes::_wide : code);
if (len > 1) {
memcpy(p+1, bcp+1, len-1);
}
// During linking the get/put and invoke instructions are rewritten
// with an index into the constant pool cache. The original constant
// pool index must be returned to caller. Rewrite the index.
if (is_rewritten && len > 1) {
bool is_wide = false;
switch (code) {
case Bytecodes::_getstatic : // fall through
case Bytecodes::_putstatic : // fall through
case Bytecodes::_getfield : // fall through
case Bytecodes::_putfield : // fall through
case Bytecodes::_invokevirtual : // fall through
case Bytecodes::_invokespecial : // fall through
case Bytecodes::_invokestatic : // fall through
case Bytecodes::_invokedynamic : // fall through
case Bytecodes::_invokeinterface : {
assert(len == 3 ||
(code == Bytecodes::_invokeinterface && len == 5) ||
(code == Bytecodes::_invokedynamic && len == 5),
"sanity check");
int cpci = Bytes::get_native_u2(bcp+1);
bool is_invokedynamic = (EnableInvokeDynamic && code == Bytecodes::_invokedynamic);
ConstantPoolCacheEntry* entry;
if (is_invokedynamic) {
cpci = Bytes::get_native_u4(bcp+1);
entry = mh->constants()->invokedynamic_cp_cache_entry_at(cpci);
} else {
// cache cannot be pre-fetched since some classes won't have it yet
entry = mh->constants()->cache()->entry_at(cpci);
}
int i = entry->constant_pool_index();
assert(i < mh->constants()->length(), "sanity check");
Bytes::put_Java_u2((address)(p+1), (u2)i); // java byte ordering
if (is_invokedynamic) *(p+3) = *(p+4) = 0;
break;
}
case Bytecodes::_ldc_w:
is_wide = true; // fall through
case Bytecodes::_ldc: {
if (bs.raw_code() == Bytecodes::_fast_aldc || bs.raw_code() == Bytecodes::_fast_aldc_w) {
int cpci = is_wide ? Bytes::get_native_u2(bcp+1) : (u1)(*(bcp+1));
int i = mh->constants()->object_to_cp_index(cpci);
assert(i < mh->constants()->length(), "sanity check");
if (is_wide) {
Bytes::put_Java_u2((address)(p+1), (u2)i); // java byte ordering
} else {
*(p+1) = (u1)i;
}
}
break;
}
}
}
p += len;
}
}