an example to examine module

yamt · Apr 22, 2023 · 358c377 · 358c377
1 parent 85a0b2f
commit 358c377
Showing 1 changed file with 47 additions and 0 deletions.
diff --git a/examples/app/app.c b/examples/app/app.c
@@ -1,4 +1,5 @@
 #include <inttypes.h>
+#include <stdio.h>
 #include <stdlib.h>
 
 #include <toywasm/fileio.h>
@@ -43,5 +44,51 @@ main(int argc, char **argv)
         xlog_printf("module %s contains %" PRIu32 " functions\n", filename,
                     m->nfuncs);
         module_print_stats(m);
+
+        /* perform some investigations on the loaded module */
+        uint32_t i;
+        uint32_t funcidx_with_most_locals = UINT32_MAX;
+        uint32_t nlocals = 0;
+        uint32_t funcidx_with_most_params = UINT32_MAX;
+        uint32_t nparams = 0;
+        uint32_t funcidx_with_most_results = UINT32_MAX;
+        uint32_t nresults = 0;
+        for (i = 0; i < m->nfuncs - m->nimportedfuncs; i++) {
+                const struct func *func = &m->funcs[i];
+                const struct localtype *lt = &func->localtype;
+                if (funcidx_with_most_locals == UINT32_MAX ||
+                    lt->nlocals > nlocals) {
+                        funcidx_with_most_locals = i;
+                        nlocals = lt->nlocals;
+                }
+                const struct functype *ft = &m->types[m->functypeidxes[i]];
+                if (funcidx_with_most_params == UINT32_MAX ||
+                    ft->parameter.ntypes > nparams) {
+                        funcidx_with_most_params = i;
+                        nparams = ft->parameter.ntypes;
+                }
+                if (funcidx_with_most_results == UINT32_MAX ||
+                    ft->result.ntypes > nresults) {
+                        funcidx_with_most_results = i;
+                        nresults = ft->result.ntypes;
+                }
+        }
+        if (funcidx_with_most_locals != UINT32_MAX) {
+                printf("func %" PRIu32 " has the most locals (%" PRIu32
+                       ") in this module.\n",
+                       m->nimportedfuncs + funcidx_with_most_locals, nlocals);
+        }
+        if (funcidx_with_most_params != UINT32_MAX) {
+                printf("func %" PRIu32 " has the most parameters (%" PRIu32
+                       ") in this module.\n",
+                       m->nimportedfuncs + funcidx_with_most_params, nparams);
+        }
+        if (funcidx_with_most_results != UINT32_MAX) {
+                printf("func %" PRIu32 " has the most results (%" PRIu32
+                       ") in this module.\n",
+                       m->nimportedfuncs + funcidx_with_most_results,
+                       nresults);
+        }
+
         exit(0);
 }