Merge pull request #228 from sysprog21/du-chain-fix

jserv · web-flow · commit 7286ab7e1193 · 2025-08-03T07:31:07.000+08:00
Fix DU-chain memory management using arena alloc
diff --git a/src/ssa.c b/src/ssa.c
@@ -410,11 +410,7 @@ void build_rdf(void)
 
 void use_chain_add_tail(insn_t *i, var_t *var)
 {
-    use_chain_t *u = calloc(1, sizeof(use_chain_t));
-    if (!u) {
-        printf("calloc failed\n");
-        abort();
-    }
+    use_chain_t *u = arena_calloc(INSN_ARENA, 1, sizeof(use_chain_t));
 
     u->insn = i;
     if (!var->users_head)
@@ -439,7 +435,6 @@ void use_chain_delete(use_chain_t *u, var_t *var)
         var->users_tail = u->prev;
         u->prev->next = NULL;
     }
-    free(u);
 }
 
 void use_chain_build(void)

Original file line number	Diff line number	Diff line change
`@@ -410,11 +410,7 @@ void build_rdf(void)`
`410`	`410`
`411`	`411`	`void use_chain_add_tail(insn_t i, var_t var)`
`412`	`412`	`{`
`413`		`- use_chain_t *u = calloc(1, sizeof(use_chain_t));`
`414`		`- if (!u) {`
`415`		`- printf("calloc failed\n");`
`416`		`- abort();`
`417`		`- }`
	`413`	`+ use_chain_t *u = arena_calloc(INSN_ARENA, 1, sizeof(use_chain_t));`
`418`	`414`
`419`	`415`	`u->insn = i;`
`420`	`416`	`if (!var->users_head)`
`@@ -439,7 +435,6 @@ void use_chain_delete(use_chain_t u, var_t var)`
`439`	`435`	`var->users_tail = u->prev;`
`440`	`436`	`u->prev->next = NULL;`
`441`	`437`	`}`
`442`		`- free(u);`
`443`	`438`	`}`
`444`	`439`
`445`	`440`	`void use_chain_build(void)`