From cb4ddb10d9f3850ab0cf64334f903975a68e4422 Mon Sep 17 00:00:00 2001
From: Felipe Pena <felipensp@gmail.com>
Date: Tue, 22 Oct 2024 05:02:12 -0300
Subject: [PATCH] cgen: add caching to contains_ptr return (#22605)

---
 vlib/v/gen/c/cgen.v | 9 +++++++++
 1 file changed, 9 insertions(+)

diff --git a/vlib/v/gen/c/cgen.v b/vlib/v/gen/c/cgen.v
index 68dc6df3de..b8fbe76ef1 100644
--- a/vlib/v/gen/c/cgen.v
+++ b/vlib/v/gen/c/cgen.v
@@ -121,6 +121,7 @@ mut:
 	chan_push_options         map[string]string // types for `ch <- x or {...}`
 	mtxs                      string            // array of mutexes if the `lock` has multiple variables
 	labeled_loops             map[string]&ast.Stmt
+	contains_ptr_cache        map[ast.Type]bool
 	inner_loop                &ast.Stmt = unsafe { nil }
 	cur_indexexpr             []int          // list of nested indexexpr which generates array_set/map_set
 	shareds                   map[int]string // types with hidden mutex for which decl has been emitted
@@ -8173,8 +8174,13 @@ pub fn (mut g Gen) get_array_depth(el_typ ast.Type) int {
 
 // returns true if `t` includes any pointer(s) - during garbage collection heap regions
 // that contain no pointers do not have to be scanned
+@[direct_array_access]
 pub fn (mut g Gen) contains_ptr(el_typ ast.Type) bool {
+	if t_typ := g.contains_ptr_cache[el_typ] {
+		return t_typ
+	}
 	if el_typ.is_any_kind_of_pointer() {
+		g.contains_ptr_cache[el_typ] = true
 		return true
 	}
 	typ := g.unwrap_generic(el_typ)
@@ -8183,10 +8189,12 @@ pub fn (mut g Gen) contains_ptr(el_typ ast.Type) bool {
 	}
 	sym := g.table.final_sym(typ)
 	if sym.language != .v {
+		g.contains_ptr_cache[typ] = true
 		return true
 	}
 	match sym.kind {
 		.i8, .i16, .int, .i64, .u8, .u16, .u32, .u64, .f32, .f64, .char, .rune, .bool, .enum {
+			g.contains_ptr_cache[typ] = false
 			return false
 		}
 		.array_fixed {
@@ -8226,6 +8234,7 @@ pub fn (mut g Gen) contains_ptr(el_typ ast.Type) bool {
 			return false
 		}
 		else {
+			g.contains_ptr_cache[typ] = true
 			return true
 		}
 	}