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kicad/eeschema/connection_graph.h

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/*
* This program source code file is part of KiCad, a free EDA CAD application.
*
* Copyright (C) 2018 CERN
* Copyright (C) 2021 KiCad Developers, see AUTHORS.txt for contributors.
* @author Jon Evans <jon@craftyjon.com>
*
* This program is free software; you can redistribute it and/or
* modify it under the terms of the GNU General Public License
* as published by the Free Software Foundation; either version 2
* of the License, or (at your option) any later version.
*
* This program is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
* GNU General Public License for more details.
*
* You should have received a copy of the GNU General Public License along
* with this program. If not, see <http://www.gnu.org/licenses/>.
*/
#ifndef _CONNECTION_GRAPH_H
#define _CONNECTION_GRAPH_H
#include <mutex>
#include <vector>
#include <erc_settings.h>
#include <sch_connection.h>
#include <sch_item.h>
#ifdef DEBUG
// Uncomment this line to enable connectivity debugging features
// #define CONNECTIVITY_DEBUG
#endif
class CONNECTION_GRAPH;
class SCHEMATIC;
class SCH_EDIT_FRAME;
class SCH_HIERLABEL;
class SCH_PIN;
class SCH_SHEET_PIN;
/**
* A subgraph is a set of items that are electrically connected on a single sheet.
*
* For example, a label connected to a wire and so on.
* A net is composed of one or more subgraphs.
*
* A set of items that appears to be physically connected may actually be more
* than one subgraph, because some items don't connect electrically.
*
* For example, multiple bus wires can come together at a junction but have
* different labels on each branch. Each label+wire branch is its own subgraph.
*
*/
class CONNECTION_SUBGRAPH
{
public:
enum class PRIORITY
{
INVALID = -1,
NONE = 0,
PIN,
SHEET_PIN,
HIER_LABEL,
LOCAL_LABEL,
POWER_PIN,
GLOBAL
};
explicit CONNECTION_SUBGRAPH( CONNECTION_GRAPH* aGraph ) :
m_graph( aGraph ),
m_dirty( false ),
m_absorbed( false ),
m_is_bus_member( false ),
m_absorbed_by( nullptr ),
m_code( -1 ),
m_multiple_drivers( false ),
m_strong_driver( false ),
m_local_driver( false ),
m_no_connect( nullptr ),
m_bus_entry( nullptr ),
m_driver( nullptr ),
m_driver_connection( nullptr ),
m_hier_parent( nullptr )
{}
~CONNECTION_SUBGRAPH() = default;
/**
* Determines which potential driver should drive the subgraph.
*
* If multiple possible drivers exist, picks one according to the priority.
* If multiple "winners" exist, returns false and sets m_driver to nullptr.
*
* @param aCheckMultipleDrivers controls whether the second driver should be captured for ERC
* @return true if m_driver was set, or false if a conflict occurred
*/
bool ResolveDrivers( bool aCheckMultipleDrivers = false );
/**
* Returns the fully-qualified net name for this subgraph (if one exists)
*/
wxString GetNetName() const;
/// Returns all the vector-based bus labels attached to this subgraph (if any)
std::vector<SCH_ITEM*> GetVectorBusLabels() const;
/// Returns all the all bus labels attached to this subgraph (if any)
std::vector<SCH_ITEM*> GetAllBusLabels() const;
/// Returns the candidate net name for a driver
const wxString& GetNameForDriver( SCH_ITEM* aItem ) const;
const wxString GetNetclassForDriver( SCH_ITEM* aItem ) const;
/// Combines another subgraph on the same sheet into this one.
void Absorb( CONNECTION_SUBGRAPH* aOther );
/// Adds a new item to the subgraph
void AddItem( SCH_ITEM* aItem );
/// Updates all items to match the driver connection
void UpdateItemConnections();
/// Provides a read-only reference to the items in the subgraph
const std::set<SCH_ITEM*>& GetItems() const
{
return m_items;
}
/// Finds all items in the subgraph as well as child subgraphs recursively
void getAllConnectedItems( std::set<std::pair<SCH_SHEET_PATH, SCH_ITEM*>>& aItems, std::set<CONNECTION_SUBGRAPH*>& aSubgraphs );
/**
* Return the priority (higher is more important) of a candidate driver
*
* 0: Invalid driver
* 1: Symbol pin
* 2: Hierarchical sheet pin
* 3: Hierarchical label
* 4: Local label
* 5: Power pin
* 6: Global label
*
* @param aDriver is the item to inspect
* @return a PRIORITY
*/
static PRIORITY GetDriverPriority( SCH_ITEM* aDriver );
PRIORITY GetDriverPriority()
{
if( m_driver )
return GetDriverPriority( m_driver );
else
return PRIORITY::NONE;
}
void RemoveItem( SCH_ITEM* aItem );
private:
wxString driverName( SCH_ITEM* aItem ) const;
public:
CONNECTION_GRAPH* m_graph;
bool m_dirty;
/// True if this subgraph has been absorbed into another. No pointers here are safe if so!
bool m_absorbed;
/**
* True if the subgraph is not actually part of a net. These are created for bus members
* to ensure that bus-to-bus connection happens but they don't have any valid data
*/
bool m_is_bus_member;
/// If this subgraph is absorbed, points to the absorbing (and valid) subgraph
CONNECTION_SUBGRAPH* m_absorbed_by;
/// Set of subgraphs that have been absorbed by this subgraph
std::set<CONNECTION_SUBGRAPH*> m_absorbed_subgraphs;
long m_code;
/**
* True if this subgraph contains more than one driver that should be
* shorted together in the netlist. For example, two labels or
* two power ports.
*/
bool m_multiple_drivers;
/// True if the driver is "strong": a label or power object
bool m_strong_driver;
/// True if the driver is a local (i.e. non-global) type
bool m_local_driver;
/// No-connect item in graph, if any
SCH_ITEM* m_no_connect;
/// Bus entry in graph, if any
SCH_ITEM* m_bus_entry;
std::set<SCH_ITEM*> m_items;
std::set<SCH_ITEM*> m_drivers;
SCH_ITEM* m_driver;
SCH_SHEET_PATH m_sheet;
/// Cache for driver connection
SCH_CONNECTION* m_driver_connection;
/**
* If a subgraph is a bus, this map contains links between the bus members and any
* local sheet neighbors with the same connection name.
*
* For example, if this subgraph is a bus D[7..0], and on the same sheet there is
* a net with label D7, this map will contain an entry for the D7 bus member, and
* the set will contain a pointer to the D7 net subgraph.
*/
std::unordered_map< std::shared_ptr<SCH_CONNECTION>,
std::unordered_set<CONNECTION_SUBGRAPH*> > m_bus_neighbors;
/**
* If this is a net, this vector contains links to any same-sheet buses that contain it.
* The string key is the name of the connection that forms the link (which isn't necessarily
* the same as the name of the connection driving this subgraph)
*/
std::unordered_map< std::shared_ptr<SCH_CONNECTION>,
std::unordered_set<CONNECTION_SUBGRAPH*> > m_bus_parents;
// Cache for lookup of any hierarchical (sheet) pins on this subgraph (for referring down)
std::set<SCH_SHEET_PIN*> m_hier_pins;
// Cache for lookup of any hierarchical ports on this subgraph (for referring up)
std::set<SCH_HIERLABEL*> m_hier_ports;
// If not null, this indicates the subgraph on a higher level sheet that is linked to this one
CONNECTION_SUBGRAPH* m_hier_parent;
// If not null, this indicates the subgraph(s) on a lower level sheet that are linked to this one
std::unordered_set<CONNECTION_SUBGRAPH*> m_hier_children;
/// A cache of escaped netnames from schematic items
mutable std::unordered_map<SCH_ITEM*, wxString> m_driver_name_cache;
};
struct NET_NAME_CODE_CACHE_KEY
{
wxString Name;
int Netcode;
bool operator==(const NET_NAME_CODE_CACHE_KEY& other) const
{
return Name == other.Name && Netcode == other.Netcode;
}
};
namespace std
{
template <>
struct hash<NET_NAME_CODE_CACHE_KEY>
{
std::size_t operator()( const NET_NAME_CODE_CACHE_KEY& k ) const
{
const std::size_t prime = 19937;
return hash<wxString>()( k.Name ) ^ ( hash<int>()( k.Netcode ) * prime );
}
};
}
/// Associates a NET_CODE_NAME with all the subgraphs in that net
typedef std::unordered_map<NET_NAME_CODE_CACHE_KEY, std::vector<CONNECTION_SUBGRAPH*>> NET_MAP;
/**
* Calculates the connectivity of a schematic and generates netlists
*/
class CONNECTION_GRAPH
{
public:
CONNECTION_GRAPH( SCHEMATIC* aSchematic = nullptr ) :
m_last_net_code( 1 ),
m_last_bus_code( 1 ),
m_last_subgraph_code( 1 ),
m_schematic( aSchematic )
{}
~CONNECTION_GRAPH()
{
Reset();
}
void Reset();
void SetSchematic( SCHEMATIC* aSchematic )
{
m_schematic = aSchematic;
}
void SetLastCodes( const CONNECTION_GRAPH* aOther )
{
m_last_net_code = aOther->m_last_net_code;
m_last_bus_code = aOther->m_last_bus_code;
m_last_subgraph_code = aOther->m_last_subgraph_code;
}
/**
* Updates the connection graph for the given list of sheets.
*
* @param aSheetList is the list of possibly modified sheets
* @param aUnconditional is true if an unconditional full recalculation should be done
* @param aChangedItemHandler an optional handler to receive any changed items
*/
void Recalculate( const SCH_SHEET_LIST& aSheetList, bool aUnconditional = false,
std::function<void( SCH_ITEM* )>* aChangedItemHandler = nullptr );
/**
* Returns a bus alias pointer for the given name if it exists (from cache)
*
* CONNECTION_GRAPH caches these, they are owned by the SCH_SCREEN that
* the alias was defined on. The cache is only used to update the graph.
*/
std::shared_ptr<BUS_ALIAS> GetBusAlias( const wxString& aName );
/**
* Determines which subgraphs have more than one conflicting bus label.
*
* @see DIALOG_MIGRATE_BUSES
* @return a list of subgraphs that need migration
*/
std::vector<const CONNECTION_SUBGRAPH*> GetBusesNeedingMigration();
/**
* Runs electrical rule checks on the connectivity graph.
*
* Precondition: graph is up-to-date
*
* @return the number of errors found
*/
int RunERC();
const NET_MAP& GetNetMap() const { return m_net_code_to_subgraphs_map; }
/**
* Returns the subgraph for a given net name on a given sheet
* @param aNetName is the local net name to look for
* @param aPath is a sheet path to look on
* @return the subgraph matching the query, or nullptr if none is found
*/
CONNECTION_SUBGRAPH* FindSubgraphByName( const wxString& aNetName,
const SCH_SHEET_PATH& aPath );
/**
* Retrieves a subgraph for the given net name, if one exists.
* Searches every sheet
* @param aNetName is the full net name to search for
* @return the subgraph matching the query, or nullptr if none is found
*/
CONNECTION_SUBGRAPH* FindFirstSubgraphByName( const wxString& aNetName );
CONNECTION_SUBGRAPH* GetSubgraphForItem( SCH_ITEM* aItem );
/**
* Returns the fully-resolved netname for a given subgraph
* @param aSubGraph Reference to the subgraph
* @return Netname string usable with m_net_name_to_subgraphs_map
*/
wxString GetResolvedSubgraphName( const CONNECTION_SUBGRAPH* aSubGraph ) const;
/**
* For a set of items, this will remove the connected items and their
* associated data including subgraphs and generated codes from the connection graph.
*
* @param aItems A vector of items whose presence should be removed from the graph
* @return The full set of all items associated with the input items that were removed
*/
std::set<std::pair<SCH_SHEET_PATH, SCH_ITEM*>> ExtractAffectedItems(
const std::set<SCH_ITEM*> &aItems );
/**
* Combines the input graph contents into the current graph. After merging, the
* original graph is invalid.
*
* @param aGraph Input graph reference to add to the current graph
*/
void Merge( CONNECTION_GRAPH& aGraph );
private:
/**
* Updates the graphical connectivity between items (i.e. where they touch)
* The items passed in must be on the same sheet.
*
* In the first phase, all items in aItemList have their connections
* initialized for the given sheet (since they may have connections on more
* than one sheet, and each needs to be calculated individually). The
* graphical connection points for the item are added to a map that stores
* (x, y) -> [list of items].
*
* Any item that is stored in the list of items that have a connection point
* at a given (x, y) location will eventually be electrically connected.
* This means that we can't store SCH_SYMBOLs in this map -- we must store
* a structure that links a specific pin on a symbol back to that symbol: a
* SCH_PIN_CONNECTION. This wrapper class is a convenience for linking a pin
* and symbol to a specific (x, y) point.
*
* In the second phase, we iterate over each value in the map, which is a
* vector of items that have overlapping connection points. After some
* checks to ensure that the items should actually connect, the items are
* linked together using ConnectedItems().
*
* As a side effect, items are loaded into m_items for BuildConnectionGraph()
*
* @param aSheet is the path to the sheet of all items in the list
* @param aItemList is a list of items to consider
*/
void updateItemConnectivity( const SCH_SHEET_PATH& aSheet,
const std::vector<SCH_ITEM*>& aItemList );
/**
* Generates the connection graph (after all item connectivity has been updated)
*
* In the first phase, the algorithm iterates over all items, and then over
* all items that are connected (graphically) to each item, placing them into
* CONNECTION_SUBGRAPHs. Items that can potentially drive connectivity (i.e.
* labels, pins, etc.) are added to the m_drivers vector of the subgraph.
*
* In the second phase, each subgraph is resolved. To resolve a subgraph,
* the driver is first selected by CONNECTION_SUBGRAPH::ResolveDrivers(),
* and then the connection for the chosen driver is propagated to all the
* other items in the subgraph.
*/
void buildConnectionGraph( std::function<void( SCH_ITEM* )>* aChangedItemHandler );
/**
* Generates individual item subgraphs on a per-sheet basis
*/
void buildItemSubGraphs();
/**
* Finds all subgraphs in the connection graph and calls ResolveDrivers() in
* parallel
*/
void resolveAllDrivers();
/**
* Maps the driver values for each subgraph
*/
void collectAllDriverValues();
/**
* Iterate through the invisible power pins to collect the global labels
* as drivers
*/
void generateInvisiblePinSubGraphs();
/**
* Iterate through labels to create placeholders for bus elements
*/
void generateBusAliasMembers();
/**
* Process all subgraphs to assign netcodes and merge subgraphs based on labels
*/
void processSubGraphs();
/**
* Helper to assign a new net code to a connection
*
* @return the assigned code
*/
int assignNewNetCode( SCH_CONNECTION& aConnection );
/**
*
* @param aNetName string with the netname for coding
* @return existing netcode (if it exists) or newly created one
*/
int getOrCreateNetCode( const wxString& aNetName );
/**
* Ensures all members of the bus connection have a valid net code assigned
* @param aConnection is a bus connection
*/
void assignNetCodesToBus( SCH_CONNECTION* aConnection );
/**
* Updates all neighbors of a subgraph with this one's connectivity info
*
* If this subgraph contains hierarchical links, this method will descent the
* hierarchy and propagate the connectivity across all linked sheets.
*
* @param aSubgraph is the subgraph being processed
* @param aForce prevents this routine from skipping subgraphs
*/
void propagateToNeighbors( CONNECTION_SUBGRAPH* aSubgraph, bool aForce );
/**
* Removes references to the given subgraphs from all structures in the
* connection graph.
*
* @param aSubgraphs set of unique subgraphs to find/remove
*/
void removeSubgraphs( std::set<CONNECTION_SUBGRAPH*>& aSubgraphs );
/**
* Search for a matching bus member inside a bus connection
*
* For bus groups, this returns a bus member that matches aSearch by name.
* For bus vectors, this returns a bus member that matches by vector index.
*
* @param aBusConnection is the bus connection to search
* @param aSearch is the net connection to search for
* @returns a member of aBusConnection that matches aSearch
*/
static SCH_CONNECTION* matchBusMember( SCH_CONNECTION* aBusConnection,
SCH_CONNECTION* aSearch );
/**
* Builds a new default connection for the given item based on its properties.
* Handles strong drivers (power pins and labels) only
*
* @param aItem is an item that can generate a connection name
* @param aSubgraph is used to determine the sheet to use and retrieve the cached name
* @return a connection generated from the item, or nullptr if item is not valid
*/
std::shared_ptr<SCH_CONNECTION> getDefaultConnection( SCH_ITEM* aItem,
CONNECTION_SUBGRAPH* aSubgraph );
void recacheSubgraphName( CONNECTION_SUBGRAPH* aSubgraph, const wxString& aOldName );
/**
* If the subgraph has multiple drivers of equal priority that are graphically connected,
* ResolveDrivers() will have stored the second driver for use by this function, which actually
* creates the markers
* @param aSubgraph is the subgraph to examine
* @return true for no errors, false for errors
*/
bool ercCheckMultipleDrivers( const CONNECTION_SUBGRAPH* aSubgraph );
bool ercCheckNetclassConflicts( const std::vector<CONNECTION_SUBGRAPH*>& subgraphs );
/**
* Checks one subgraph for conflicting connections between net and bus labels
*
* For example, a net wire connected to a bus port/pin, or vice versa
*
* @param aSubgraph is the subgraph to examine
* @return true for no errors, false for errors
*/
bool ercCheckBusToNetConflicts( const CONNECTION_SUBGRAPH* aSubgraph );
/**
* Checks one subgraph for conflicting connections between two bus items
*
* For example, a labeled bus wire connected to a hierarchical sheet pin
* where the labeled bus doesn't contain any of the same bus members as the
* sheet pin
*
* @param aSubgraph is the subgraph to examine
* @return true for no errors, false for errors
*/
bool ercCheckBusToBusConflicts( const CONNECTION_SUBGRAPH* aSubgraph );
/**
* Checks one subgraph for conflicting bus entry to bus connections
*
* For example, a wire with label "A0" is connected to a bus labeled "D[8..0]"
*
* Will also check for mistakes related to bus group names, for example:
* A bus group named "USB{DP DM}" should have bus entry connections like
* "USB.DP" but someone might accidentally just enter "DP"
*
* @param aSubgraph is the subgraph to examine
* @return true for no errors, false for errors
*/
bool ercCheckBusToBusEntryConflicts( const CONNECTION_SUBGRAPH* aSubgraph );
/**
* Checks one subgraph for proper presence or absence of no-connect symbols
*
* A pin with a no-connect symbol should not have any connections
* A pin without a no-connect symbol should have at least one connection
*
* @param aSubgraph is the subgraph to examine
* @return true for no errors, false for errors
*/
bool ercCheckNoConnects( const CONNECTION_SUBGRAPH* aSubgraph );
/**
* Checks one subgraph for floating wires
*
* Will throw an error for any subgraph that consists of just wires with no driver
*
* @param aSubgraph is the subgraph to examine
* @return true for no errors, false for errors
*/
bool ercCheckFloatingWires( const CONNECTION_SUBGRAPH* aSubgraph );
/**
* Checks one subgraph for proper connection of labels
*
* Labels should be connected to something
*
* @param aSubgraph is the subgraph to examine
* @param aCheckGlobalLabels is true if global labels should be checked for loneliness
* @return true for no errors, false for errors
*/
bool ercCheckLabels( const CONNECTION_SUBGRAPH* aSubgraph );
/**
* Checks that a hierarchical sheet has at least one matching label inside the sheet for each
* port on the parent sheet object
*
* @param aSubgraph is the subgraph to examine
* @return the number of errors found
*/
int ercCheckHierSheets();
/**
* Get the number of pins in a given subgraph
* @param aLocSubgraph Subgraph to search
* @return total number of pins in the subgraph
*/
size_t hasPins( const CONNECTION_SUBGRAPH* aLocSubgraph );
private:
// All the sheets in the schematic (as long as we don't have partial updates)
SCH_SHEET_LIST m_sheetList;
// All connectable items in the schematic
std::vector<SCH_ITEM*> m_items;
// The owner of all CONNECTION_SUBGRAPH objects
std::vector<CONNECTION_SUBGRAPH*> m_subgraphs;
// Cache of a subset of m_subgraphs
std::vector<CONNECTION_SUBGRAPH*> m_driver_subgraphs;
// Cache to lookup subgraphs in m_driver_subgraphs by sheet path
std::unordered_map<SCH_SHEET_PATH, std::vector<CONNECTION_SUBGRAPH*>> m_sheet_to_subgraphs_map;
std::vector<std::pair<SCH_SHEET_PATH, SCH_PIN*>> m_invisible_power_pins;
std::unordered_map<wxString, std::shared_ptr<BUS_ALIAS>> m_bus_alias_cache;
std::unordered_map<wxString, int> m_net_name_to_code_map;
std::unordered_map<wxString, int> m_bus_name_to_code_map;
std::unordered_map<wxString, std::vector<const CONNECTION_SUBGRAPH*>> m_global_label_cache;
std::map< std::pair<SCH_SHEET_PATH, wxString>,
std::vector<const CONNECTION_SUBGRAPH*> > m_local_label_cache;
std::unordered_map<wxString, std::vector<CONNECTION_SUBGRAPH*>> m_net_name_to_subgraphs_map;
std::unordered_map<SCH_ITEM*, CONNECTION_SUBGRAPH*> m_item_to_subgraph_map;
NET_MAP m_net_code_to_subgraphs_map;
int m_last_net_code;
int m_last_bus_code;
int m_last_subgraph_code;
SCHEMATIC* m_schematic; ///< The schematic this graph represents
};
#endif
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