---
name: "pcre_jit_stack_alloc"
section: "3"
platform: "linux"
package: "pcre"
version: "8.45-5"
release: "Arch Linux 2026-11-01"
platforms: ["linux"]
url: "https://new.carta.tech/pcre_jit_stack_alloc"
---

# pcre\_jit\_stack\_alloc(3)

Perl-compatible regular expressions

## NAME

PCRE - Perl-compatible regular expressions

## SYNOPSIS

**#include \<pcre.h\>**

```
pcre_jit_stack *pcre_jit_stack_alloc(int startsize,
     int maxsize);

pcre16_jit_stack *pcre16_jit_stack_alloc(int startsize,
     int maxsize);

pcre32_jit_stack *pcre32_jit_stack_alloc(int startsize,
     int maxsize);
```

## DESCRIPTION

This function is used to create a stack for use by the code compiled by the JIT optimization of **pcre\[16\|32\]\_study()**. The arguments are a starting size for the stack, and a maximum size to which it is allowed to grow. The result can be passed to the JIT run-time code by **pcre\[16\|32\]\_assign\_jit\_stack()**, or that function can set up a callback for obtaining a stack. A maximum stack size of 512K to 1M should be more than enough for any pattern. For more details, see the **pcrejit** page.

There is a complete description of the PCRE native API in the **pcreapi** page and a description of the POSIX API in the **pcreposix** page.