| #include <isolator/hei_isolation_node.hpp> |
| #include <util/hei_bit_string.hpp> |
| |
| namespace libhei |
| { |
| |
| //------------------------------------------------------------------------------ |
| |
| bool IsolationNode::analyze(const Chip& i_chip, AttentionType_t i_attnType, |
| IsolationData& io_isoData) const |
| { |
| bool o_activeAttn = false; // Initially, assume no active attentions. |
| |
| // Keep track of nodes that have been analyzed to avoid cyclic isolation. |
| pushIsolationStack(); |
| |
| // A rule for i_attnType must exist. |
| auto rule_itr = iv_rules.find(i_attnType); |
| HEI_ASSERT(iv_rules.end() != rule_itr); |
| |
| // Get the returned BitString for this rule. |
| const BitString* bs = rule_itr->second->getBitString(i_chip); |
| |
| // Ensure this BitString is not longer than the maximum bit field. |
| HEI_ASSERT(bs->getBitLen() <= (1 << (sizeof(BitPosition_t) * 8))); |
| |
| // Find all active bits for this rule. |
| for (BitPosition_t bit = 0; bit < bs->getBitLen(); bit++) |
| { |
| // Continue to the next bit if not active. |
| if (!bs->isBitSet(bit)) |
| continue; |
| |
| // At least one active bit was found. |
| o_activeAttn = true; |
| |
| // Determine if this attention originated from another register or if it |
| // is a leaf in the isolation tree. |
| auto child_itr = iv_children.find(bit); |
| if (iv_children.end() != child_itr) |
| { |
| // This bit was driven from an attention from another register. |
| // Continue down the isolation tree to look for more attentions. |
| bool attnFound = |
| child_itr->second->analyze(i_chip, i_attnType, io_isoData); |
| if (!attnFound) |
| { |
| // Something went wrong. There should have been an active |
| // attention. It's possible there is a bug in the Chip Data |
| // File. Or, it is also possible some other piece of code is |
| // clearing the attention before this code is able to analyze |
| // it. Another possibility is that the hardware it not behaving |
| // as expected. Since we really don't know what happened, we |
| // should not assert. Instead, add this bit's signature to |
| // io_isoData. If there are no other active attentions, the user |
| // application could use this signature to help determine, and |
| // circumvent, the isolation problem. |
| io_isoData.addSignature( |
| Signature{i_chip, iv_id, iv_instance, bit, i_attnType}); |
| } |
| } |
| else |
| { |
| // We have reached a leaf in the isolation tree. Add this bit's |
| // signature to io_isoData. |
| io_isoData.addSignature( |
| Signature{i_chip, iv_id, iv_instance, bit, i_attnType}); |
| } |
| } |
| |
| // Analysis is complete on this node. So remove it from cv_isolationStack. |
| popIsolationStack(); |
| |
| return o_activeAttn; |
| } |
| |
| //------------------------------------------------------------------------------ |
| |
| void IsolationNode::addRule(AttentionType_t i_attnType, |
| Register::ConstPtr i_rule) |
| { |
| HEI_ASSERT(i_rule); // should not be null |
| |
| auto ret = iv_rules.emplace(i_attnType, i_rule); |
| |
| // If an entry already existed, it must point to the same object. |
| HEI_ASSERT(ret.second || (ret.first->second == i_rule)); |
| } |
| |
| //------------------------------------------------------------------------------ |
| |
| void IsolationNode::addChild(uint8_t i_bit, ConstPtr i_child) |
| { |
| HEI_ASSERT(i_child); // should not be null |
| |
| auto ret = iv_children.emplace(i_bit, i_child); |
| |
| // If an entry already existed, it must point to the same object. |
| HEI_ASSERT(ret.second || (ret.first->second == i_child)); |
| } |
| |
| //------------------------------------------------------------------------------ |
| |
| std::vector<IsolationNode::ConstPtr> IsolationNode::cv_isolationStack{}; |
| |
| //------------------------------------------------------------------------------ |
| |
| void IsolationNode::pushIsolationStack() const |
| { |
| // Ensure this node does not already exist in cv_isolationStack. |
| auto itr = std::find(cv_isolationStack.begin(), cv_isolationStack.end(), |
| ConstPtr(this)); |
| HEI_ASSERT(cv_isolationStack.end() == itr); |
| |
| // Push to node to the stack. |
| cv_isolationStack.push_back(ConstPtr(this)); |
| } |
| |
| //------------------------------------------------------------------------------ |
| |
| } // end namespace libhei |