Enable analysis report of post synthesis resource in json

Note: This was already implemented, it was just not called from the
step_synthesize_bitfile.

src/finn/builder/build_dataflow_steps.py

@@ -58,6 +58,7 @@
 from finn.analysis.fpgadataflow.dataflow_performance import dataflow_performance
 from finn.analysis.fpgadataflow.exp_cycles_per_layer import exp_cycles_per_layer
 from finn.analysis.fpgadataflow.hls_synth_res_estimation import hls_synth_res_estimation
+from finn.analysis.fpgadataflow.post_synth_res import post_synth_res
 from finn.analysis.fpgadataflow.op_and_param_counts import (
     aggregate_dict_keys,
     op_and_param_counts,
@@ -801,6 +802,11 @@ def step_synthesize_bitfile(model: ModelWrapper, cfg: DataflowBuildConfig):
                 model.get_metadata_prop("vivado_synth_rpt"),
                 report_dir + "/post_synth_resources.xml",
             )
+
+            post_synth_resources = model.analysis(post_synth_res)
+            with open(report_dir + "/post_synth_resources.json", "w") as f:
+                json.dump(post_synth_resources, f, indent=2)
+
             vivado_pynq_proj_dir = model.get_metadata_prop("vivado_pynq_proj")
             timing_rpt = (
                 "%s/finn_zynq_link.runs/impl_1/top_wrapper_timing_summary_routed.rpt"
@@ -825,6 +831,10 @@ def step_synthesize_bitfile(model: ModelWrapper, cfg: DataflowBuildConfig):
                 model.get_metadata_prop("vivado_synth_rpt"),
                 report_dir + "/post_synth_resources.xml",
             )
+
+            post_synth_resources = model.analysis(post_synth_res)
+            with open(report_dir + "/post_synth_resources.json", "w") as f:
+                json.dump(post_synth_resources, f, indent=2)
         else:
             raise Exception("Unrecognized shell_flow_type: " + str(cfg.shell_flow_type))
         print("Bitfile written into " + bitfile_dir)