[Analysis Pass] Added resource estimation analysis pass after hls synthesis

src/finn/analysis/fpgadataflow/hls_synth_res_estimation.py

+import os
+import xml.etree.ElementTree as ET
+
+import finn.core.utils as util
+import finn.custom_op.registry as registry
+
+
+def hls_synth_res_estimation(model):
+    """Extracts the results from the vivado synthesis.
+    Returns {node name : resource estimation}i"""
+
+    res_dict = {}
+    for node in model.graph.node:
+        if node.domain == "finn":
+            backend_attribute = util.get_by_name(node.attribute, "backend")
+            if backend_attribute is None:
+                continue
+            backend_value = backend_attribute.s.decode("UTF-8")
+            if backend_value == "fpgadataflow":
+                op_type = node.op_type
+                inst = registry.custom_op[op_type](node)
+                code_gen_dir = inst.get_nodeattr("code_gen_dir_ipgen")
+                if code_gen_dir == "":
+                    raise Exception(
+                        """Please run "CodeGen_ipgen" transformation and
+                            "HLSSynth_IPGen" first to generate the report files"""
+                    )
+                else:
+                    xmlfile = "{}/project_{}/sol1/syn/report/{}_csynth.xml".format(
+                        code_gen_dir, node.name, node.name
+                    )
+
+                    if os.path.isfile(xmlfile):
+                        res_dict[node.name] = []
+                        tree = ET.parse(xmlfile)
+                        root = tree.getroot()
+                        for item in root.findall("AreaEstimates/Resources"):
+                            for child in item:
+                                res_dict[node.name].append(
+                                    ["{} : {}".format(child.tag, child.text)]
+                                )
+                    else:
+                        raise Exception(
+                            """Please run "HLSSynth_IPGen" first
+                                to generate the report files"""
+                        )
+
+    return res_dict