Import apidraft.h

Signed-off-by: Clifford Wolf <clifford@clifford.at>

apidraft.h

@@ -0,0 +1,134 @@
+#include <stdint.h>
+#include <string>
+
+// replace with proper IdString later
+typedef std::string IdString;
+
+// -------------------------------------------------------
+// Arch-specific declarations
+
+#ifdef ARCH_ICE40
+struct ObjId
+{
+	uint8_t tile_x = 0, tile_y = 0;
+	uint16_t index = 0;
+
+	bool nil() const {
+		return !tile_x && !tile_y && !index;
+	}
+} __attribute__((packed));
+
+struct ObjIterator
+{
+	// ...
+	ObjId operator*() const;
+};
+
+struct ObjRange
+{
+	ObjIterator begin();
+	ObjIterator end();
+};
+
+struct BelPin
+{
+	ObjId bel;
+	IdString pin;
+};
+
+struct BelPinIterator
+{
+	// ...
+	BelPin operator*() const;
+};
+
+struct BelPinRange
+{
+	BelPinIterator begin();
+	BelPinIterator end();
+};
+
+struct GuiLine
+{
+	float x1, y1, x2, y2;
+};
+
+struct Chip
+{
+	Chip(std::string cfg);
+
+	ObjId getObjByName(IdString name) const;
+	IdString getObjName(ObjId obj) const;
+	IdString getBelType(ObjId obj) const;
+	ObjRange getBelsByType(IdString type) const;
+
+	void getObjPosition(ObjId obj, float &x, float &y) const;
+	vector<GuiLine> getGuiLines(ObjId obj) const;
+
+	ObjRange getWires() const;
+	ObjRange getWiresUphillWire(ObjId wire) const;
+	ObjRange getWiresDownhillWire(ObjId wire) const;
+	ObjRange getWiresBidirWire(ObjId wire) const;
+	ObjRange getWireAliases(ObjId wire) const;
+
+	ObjId getWireBelPin(ObjId bel, IdString pin) const;
+	BelPin getBelPinUphillWire(ObjId wire) const;
+	BelPinRange getBelPinsDownhillWire(ObjId wire) const;
+};
+#endif
+
+// -------------------------------------------------------
+// Generic declarations
+
+struct PortRef
+{
+	IdString cell_name;
+	IdString port_name;
+};
+
+struct NetInfo
+{
+	IdString name;
+	PortRef driver;
+	vector<PortRef> users;
+	dict<IdString, std::string> attrs;
+
+	// wire objid -> signal delay
+	dict<ObjId, float> wires;
+};
+
+enum PortType
+{
+	PORT_IN = 0,
+	PORT_OUT = 1,
+	PORT_INOUT = 2
+};
+
+struct PortInfo
+{
+	IdString name, net;
+	PortType type;
+};
+
+struct CellInfo
+{
+	IdString name, type;
+	dict<IdString, PortInfo> ports;
+	dict<IdString, std::string> attrs, params;
+
+	ObjId bel;
+	// port_name -> pin_name
+	dict<IdString, IdString> pins;
+};
+
+struct Design
+{
+	struct Chip;
+
+	Design(std::string chipCfg) : Chip(chipCfg) {
+		// ...
+	}
+
+	dict<IdString, *NetInfo> nets;
+	dict<IdString, *CellInfo> cells;
+};