Merged with the default branch.

6 files changed, 462 insertions, 102 deletions

diff --git a/src/core/ngx_buf.h b/src/core/ngx_buf.h
index 4b665629c..fdcd0cddf 100644
--- a/src/core/ngx_buf.h
+++ b/src/core/ngx_buf.h
@@ -90,9 +90,6 @@ struct ngx_output_chain_ctx_s {
 
 #if (NGX_HAVE_FILE_AIO || NGX_COMPAT)
     ngx_output_chain_aio_pt      aio_handler;
-#if (NGX_HAVE_AIO_SENDFILE || NGX_COMPAT)
-    ssize_t                    (*aio_preload)(ngx_buf_t *file);
-#endif
 #endif
 
 #if (NGX_THREADS || NGX_COMPAT)
diff --git a/src/core/ngx_connection.h b/src/core/ngx_connection.h
index 4578d9065..68fdce53e 100644
--- a/src/core/ngx_connection.h
+++ b/src/core/ngx_connection.h
@@ -190,7 +190,7 @@ struct ngx_connection_s {
 
     unsigned            need_last_buf:1;
 
-#if (NGX_HAVE_AIO_SENDFILE || NGX_COMPAT)
+#if (NGX_HAVE_SENDFILE_NODISKIO || NGX_COMPAT)
     unsigned            busy_count:2;
 #endif
 
diff --git a/src/core/ngx_module.h b/src/core/ngx_module.h
index 8cf3210e8..6fb455426 100644
--- a/src/core/ngx_module.h
+++ b/src/core/ngx_module.h
@@ -41,7 +41,7 @@
 #define NGX_MODULE_SIGNATURE_3   "0"
 #endif
 
-#if (NGX_HAVE_AIO_SENDFILE || NGX_COMPAT)
+#if (NGX_HAVE_SENDFILE_NODISKIO || NGX_COMPAT)
 #define NGX_MODULE_SIGNATURE_4   "1"
 #else
 #define NGX_MODULE_SIGNATURE_4   "0"
diff --git a/src/core/ngx_output_chain.c b/src/core/ngx_output_chain.c
index fd4603b19..857074253 100644
--- a/src/core/ngx_output_chain.c
+++ b/src/core/ngx_output_chain.c
@@ -29,10 +29,6 @@
 
 static ngx_inline ngx_int_t
     ngx_output_chain_as_is(ngx_output_chain_ctx_t *ctx, ngx_buf_t *buf);
-#if (NGX_HAVE_AIO_SENDFILE)
-static ngx_int_t ngx_output_chain_aio_setup(ngx_output_chain_ctx_t *ctx,
-    ngx_file_t *file);
-#endif
 static ngx_int_t ngx_output_chain_add_copy(ngx_pool_t *pool,
     ngx_chain_t **chain, ngx_chain_t *in);
 static ngx_int_t ngx_output_chain_align_file_buf(ngx_output_chain_ctx_t *ctx,
@@ -260,10 +256,6 @@ ngx_output_chain_as_is(ngx_output_chain_ctx_t *ctx, ngx_buf_t *buf)
     }
 #endif
 
-    if (buf->in_file && buf->file->directio) {
-        return 0;
-    }
-
     sendfile = ctx->sendfile;
 
 #if (NGX_SENDFILE_LIMIT)
@@ -274,6 +266,19 @@ ngx_output_chain_as_is(ngx_output_chain_ctx_t *ctx, ngx_buf_t *buf)
 
 #endif
 
+#if !(NGX_HAVE_SENDFILE_NODISKIO)
+
+    /*
+     * With DIRECTIO, disable sendfile() unless sendfile(SF_NOCACHE)
+     * is available.
+     */
+
+    if (buf->in_file && buf->file->directio) {
+        sendfile = 0;
+    }
+
+#endif
+
     if (!sendfile) {
 
         if (!ngx_buf_in_memory(buf)) {
@@ -283,12 +288,6 @@ ngx_output_chain_as_is(ngx_output_chain_ctx_t *ctx, ngx_buf_t *buf)
         buf->in_file = 0;
     }
 
-#if (NGX_HAVE_AIO_SENDFILE)
-    if (ctx->aio_preload && buf->in_file) {
-        (void) ngx_output_chain_aio_setup(ctx, buf->file);
-    }
-#endif
-
     if (ctx->need_in_memory && !ngx_buf_in_memory(buf)) {
         return 0;
     }
@@ -301,28 +300,6 @@ ngx_output_chain_as_is(ngx_output_chain_ctx_t *ctx, ngx_buf_t *buf)
 }
 
 
-#if (NGX_HAVE_AIO_SENDFILE)
-
-static ngx_int_t
-ngx_output_chain_aio_setup(ngx_output_chain_ctx_t *ctx, ngx_file_t *file)
-{
-    ngx_event_aio_t  *aio;
-
-    if (file->aio == NULL && ngx_file_aio_init(file, ctx->pool) != NGX_OK) {
-        return NGX_ERROR;
-    }
-
-    aio = file->aio;
-
-    aio->data = ctx->filter_ctx;
-    aio->preload_handler = ctx->aio_preload;
-
-    return NGX_OK;
-}
-
-#endif
-
-
 static ngx_int_t
 ngx_output_chain_add_copy(ngx_pool_t *pool, ngx_chain_t **chain,
     ngx_chain_t *in)
diff --git a/src/core/ngx_regex.c b/src/core/ngx_regex.c
index 52169f655..bebf3b6a8 100644
--- a/src/core/ngx_regex.c
+++ b/src/core/ngx_regex.c
@@ -10,15 +10,22 @@
 
 
 typedef struct {
-    ngx_flag_t  pcre_jit;
+    ngx_flag_t   pcre_jit;
+    ngx_list_t  *studies;
 } ngx_regex_conf_t;
 
 
+static ngx_inline void ngx_regex_malloc_init(ngx_pool_t *pool);
+static ngx_inline void ngx_regex_malloc_done(void);
+
+#if (NGX_PCRE2)
+static void * ngx_libc_cdecl ngx_regex_malloc(size_t size, void *data);
+static void ngx_libc_cdecl ngx_regex_free(void *p, void *data);
+#else
 static void * ngx_libc_cdecl ngx_regex_malloc(size_t size);
 static void ngx_libc_cdecl ngx_regex_free(void *p);
-#if (NGX_HAVE_PCRE_JIT)
-static void ngx_pcre_free_studies(void *data);
 #endif
+static void ngx_regex_cleanup(void *data);
 
 static ngx_int_t ngx_regex_module_init(ngx_cycle_t *cycle);
 
@@ -65,31 +72,196 @@ ngx_module_t  ngx_regex_module = {
 };
 
 
-static ngx_pool_t  *ngx_pcre_pool;
-static ngx_list_t  *ngx_pcre_studies;
+static ngx_pool_t             *ngx_regex_pool;
+static ngx_list_t             *ngx_regex_studies;
+static ngx_uint_t              ngx_regex_direct_alloc;
+
+#if (NGX_PCRE2)
+static pcre2_compile_context  *ngx_regex_compile_context;
+static pcre2_match_data       *ngx_regex_match_data;
+static ngx_uint_t              ngx_regex_match_data_size;
+#endif
 
 
 void
 ngx_regex_init(void)
 {
+#if !(NGX_PCRE2)
     pcre_malloc = ngx_regex_malloc;
     pcre_free = ngx_regex_free;
+#endif
 }
 
 
 static ngx_inline void
 ngx_regex_malloc_init(ngx_pool_t *pool)
 {
-    ngx_pcre_pool = pool;
+    ngx_regex_pool = pool;
+    ngx_regex_direct_alloc = (pool == NULL) ? 1 : 0;
 }
 
 
 static ngx_inline void
 ngx_regex_malloc_done(void)
 {
-    ngx_pcre_pool = NULL;
+    ngx_regex_pool = NULL;
+    ngx_regex_direct_alloc = 0;
+}
+
+
+#if (NGX_PCRE2)
+
+ngx_int_t
+ngx_regex_compile(ngx_regex_compile_t *rc)
+{
+    int                     n, errcode;
+    char                   *p;
+    u_char                  errstr[128];
+    size_t                  erroff;
+    uint32_t                options;
+    pcre2_code             *re;
+    ngx_regex_elt_t        *elt;
+    pcre2_general_context  *gctx;
+    pcre2_compile_context  *cctx;
+
+    if (ngx_regex_compile_context == NULL) {
+        /*
+         * Allocate a compile context if not yet allocated.  This uses
+         * direct allocations from heap, so the result can be cached
+         * even at runtime.
+         */
+
+        ngx_regex_malloc_init(NULL);
+
+        gctx = pcre2_general_context_create(ngx_regex_malloc, ngx_regex_free,
+                                            NULL);
+        if (gctx == NULL) {
+            ngx_regex_malloc_done();
+            goto nomem;
+        }
+
+        cctx = pcre2_compile_context_create(gctx);
+        if (cctx == NULL) {
+            pcre2_general_context_free(gctx);
+            ngx_regex_malloc_done();
+            goto nomem;
+        }
+
+        ngx_regex_compile_context = cctx;
+
+        pcre2_general_context_free(gctx);
+        ngx_regex_malloc_done();
+    }
+
+    options = 0;
+
+    if (rc->options & NGX_REGEX_CASELESS) {
+        options |= PCRE2_CASELESS;
+    }
+
+    if (rc->options & NGX_REGEX_MULTILINE) {
+        options |= PCRE2_MULTILINE;
+    }
+
+    if (rc->options & ~(NGX_REGEX_CASELESS|NGX_REGEX_MULTILINE)) {
+        rc->err.len = ngx_snprintf(rc->err.data, rc->err.len,
+                            "regex \"%V\" compilation failed: invalid options",
+                            &rc->pattern)
+                      - rc->err.data;
+        return NGX_ERROR;
+    }
+
+    ngx_regex_malloc_init(rc->pool);
+
+    re = pcre2_compile(rc->pattern.data, rc->pattern.len, options,
+                       &errcode, &erroff, ngx_regex_compile_context);
+
+    /* ensure that there is no current pool */
+    ngx_regex_malloc_done();
+
+    if (re == NULL) {
+        pcre2_get_error_message(errcode, errstr, 128);
+
+        if ((size_t) erroff == rc->pattern.len) {
+            rc->err.len = ngx_snprintf(rc->err.data, rc->err.len,
+                              "pcre2_compile() failed: %s in \"%V\"",
+                               errstr, &rc->pattern)
+                          - rc->err.data;
+
+        } else {
+            rc->err.len = ngx_snprintf(rc->err.data, rc->err.len,
+                              "pcre2_compile() failed: %s in \"%V\" at \"%s\"",
+                               errstr, &rc->pattern, rc->pattern.data + erroff)
+                          - rc->err.data;
+        }
+
+        return NGX_ERROR;
+    }
+
+    rc->regex = re;
+
+    /* do not study at runtime */
+
+    if (ngx_regex_studies != NULL) {
+        elt = ngx_list_push(ngx_regex_studies);
+        if (elt == NULL) {
+            goto nomem;
+        }
+
+        elt->regex = rc->regex;
+        elt->name = rc->pattern.data;
+    }
+
+    n = pcre2_pattern_info(re, PCRE2_INFO_CAPTURECOUNT, &rc->captures);
+    if (n < 0) {
+        p = "pcre2_pattern_info(\"%V\", PCRE2_INFO_CAPTURECOUNT) failed: %d";
+        goto failed;
+    }
+
+    if (rc->captures == 0) {
+        return NGX_OK;
+    }
+
+    n = pcre2_pattern_info(re, PCRE2_INFO_NAMECOUNT, &rc->named_captures);
+    if (n < 0) {
+        p = "pcre2_pattern_info(\"%V\", PCRE2_INFO_NAMECOUNT) failed: %d";
+        goto failed;
+    }
+
+    if (rc->named_captures == 0) {
+        return NGX_OK;
+    }
+
+    n = pcre2_pattern_info(re, PCRE2_INFO_NAMEENTRYSIZE, &rc->name_size);
+    if (n < 0) {
+        p = "pcre2_pattern_info(\"%V\", PCRE2_INFO_NAMEENTRYSIZE) failed: %d";
+        goto failed;
+    }
+
+    n = pcre2_pattern_info(re, PCRE2_INFO_NAMETABLE, &rc->names);
+    if (n < 0) {
+        p = "pcre2_pattern_info(\"%V\", PCRE2_INFO_NAMETABLE) failed: %d";
+        goto failed;
+    }
+
+    return NGX_OK;
+
+failed:
+
+    rc->err.len = ngx_snprintf(rc->err.data, rc->err.len, p, &rc->pattern, n)
+                  - rc->err.data;
+    return NGX_ERROR;
+
+nomem:
+
+    rc->err.len = ngx_snprintf(rc->err.data, rc->err.len,
+                               "regex \"%V\" compilation failed: no memory",
+                               &rc->pattern)
+                  - rc->err.data;
+    return NGX_ERROR;
 }
 
+#else
 
 ngx_int_t
 ngx_regex_compile(ngx_regex_compile_t *rc)
@@ -98,11 +270,30 @@ ngx_regex_compile(ngx_regex_compile_t *rc)
     char             *p;
     pcre             *re;
     const char       *errstr;
+    ngx_uint_t        options;
     ngx_regex_elt_t  *elt;
 
+    options = 0;
+
+    if (rc->options & NGX_REGEX_CASELESS) {
+        options |= PCRE_CASELESS;
+    }
+
+    if (rc->options & NGX_REGEX_MULTILINE) {
+        options |= PCRE_MULTILINE;
+    }
+
+    if (rc->options & ~(NGX_REGEX_CASELESS|NGX_REGEX_MULTILINE)) {
+        rc->err.len = ngx_snprintf(rc->err.data, rc->err.len,
+                            "regex \"%V\" compilation failed: invalid options",
+                            &rc->pattern)
+                      - rc->err.data;
+        return NGX_ERROR;
+    }
+
     ngx_regex_malloc_init(rc->pool);
 
-    re = pcre_compile((const char *) rc->pattern.data, (int) rc->options,
+    re = pcre_compile((const char *) rc->pattern.data, (int) options,
                       &errstr, &erroff, NULL);
 
     /* ensure that there is no current pool */
@@ -113,13 +304,13 @@ ngx_regex_compile(ngx_regex_compile_t *rc)
            rc->err.len = ngx_snprintf(rc->err.data, rc->err.len,
                               "pcre_compile() failed: %s in \"%V\"",
                                errstr, &rc->pattern)
-                      - rc->err.data;
+                         - rc->err.data;
 
         } else {
            rc->err.len = ngx_snprintf(rc->err.data, rc->err.len,
                               "pcre_compile() failed: %s in \"%V\" at \"%s\"",
                                errstr, &rc->pattern, rc->pattern.data + erroff)
-                      - rc->err.data;
+                         - rc->err.data;
         }
 
         return NGX_ERROR;
@@ -134,8 +325,8 @@ ngx_regex_compile(ngx_regex_compile_t *rc)
 
     /* do not study at runtime */
 
-    if (ngx_pcre_studies != NULL) {
-        elt = ngx_list_push(ngx_pcre_studies);
+    if (ngx_regex_studies != NULL) {
+        elt = ngx_list_push(ngx_regex_studies);
         if (elt == NULL) {
             goto nomem;
         }
@@ -193,6 +384,83 @@ nomem:
     return NGX_ERROR;
 }
 
+#endif
+
+
+#if (NGX_PCRE2)
+
+ngx_int_t
+ngx_regex_exec(ngx_regex_t *re, ngx_str_t *s, int *captures, ngx_uint_t size)
+{
+    size_t      *ov;
+    ngx_int_t    rc;
+    ngx_uint_t   n, i;
+
+    /*
+     * The pcre2_match() function might allocate memory for backtracking
+     * frames, typical allocations are from 40k and above.  So the allocator
+     * is configured to do direct allocations from heap during matching.
+     */
+
+    ngx_regex_malloc_init(NULL);
+
+    if (ngx_regex_match_data == NULL
+        || size > ngx_regex_match_data_size)
+    {
+        /*
+         * Allocate a match data if not yet allocated or smaller than
+         * needed.
+         */
+
+        if (ngx_regex_match_data) {
+            pcre2_match_data_free(ngx_regex_match_data);
+        }
+
+        ngx_regex_match_data_size = size;
+        ngx_regex_match_data = pcre2_match_data_create(size / 3, NULL);
+
+        if (ngx_regex_match_data == NULL) {
+            rc = PCRE2_ERROR_NOMEMORY;
+            goto failed;
+        }
+    }
+
+    rc = pcre2_match(re, s->data, s->len, 0, 0, ngx_regex_match_data, NULL);
+
+    if (rc < 0) {
+        goto failed;
+    }
+
+    n = pcre2_get_ovector_count(ngx_regex_match_data);
+    ov = pcre2_get_ovector_pointer(ngx_regex_match_data);
+
+    if (n > size / 3) {
+        n = size / 3;
+    }
+
+    for (i = 0; i < n; i++) {
+        captures[i * 2] = ov[i * 2];
+        captures[i * 2 + 1] = ov[i * 2 + 1];
+    }
+
+failed:
+
+    ngx_regex_malloc_done();
+
+    return rc;
+}
+
+#else
+
+ngx_int_t
+ngx_regex_exec(ngx_regex_t *re, ngx_str_t *s, int *captures, ngx_uint_t size)
+{
+    return pcre_exec(re->code, re->extra, (const char *) s->data, s->len,
+                     0, 0, captures, size);
+}
+
+#endif
+
 
 ngx_int_t
 ngx_regex_exec_array(ngx_array_t *a, ngx_str_t *s, ngx_log_t *log)
@@ -227,14 +495,40 @@ ngx_regex_exec_array(ngx_array_t *a, ngx_str_t *s, ngx_log_t *log)
 }
 
 
+#if (NGX_PCRE2)
+
 static void * ngx_libc_cdecl
-ngx_regex_malloc(size_t size)
+ngx_regex_malloc(size_t size, void *data)
 {
-    ngx_pool_t      *pool;
-    pool = ngx_pcre_pool;
+    if (ngx_regex_pool) {
+        return ngx_palloc(ngx_regex_pool, size);
+    }
 
-    if (pool) {
-        return ngx_palloc(pool, size);
+    if (ngx_regex_direct_alloc) {
+        return ngx_alloc(size, ngx_cycle->log);
+    }
+
+    return NULL;
+}
+
+
+static void ngx_libc_cdecl
+ngx_regex_free(void *p, void *data)
+{
+    if (ngx_regex_direct_alloc) {
+        ngx_free(p);
+    }
+
+    return;
+}
+
+#else
+
+static void * ngx_libc_cdecl
+ngx_regex_malloc(size_t size)
+{
+    if (ngx_regex_pool) {
+        return ngx_palloc(ngx_regex_pool, size);
     }
 
     return NULL;
@@ -247,19 +541,20 @@ ngx_regex_free(void *p)
     return;
 }
 
+#endif
 
-#if (NGX_HAVE_PCRE_JIT)
 
 static void
-ngx_pcre_free_studies(void *data)
+ngx_regex_cleanup(void *data)
 {
-    ngx_list_t *studies = data;
+#if (NGX_PCRE2 || NGX_HAVE_PCRE_JIT)
+    ngx_regex_conf_t *rcf = data;
 
     ngx_uint_t        i;
     ngx_list_part_t  *part;
     ngx_regex_elt_t  *elts;
 
-    part = &studies->part;
+    part = &rcf->studies->part;
     elts = part->elts;
 
     for (i = 0; /* void */ ; i++) {
@@ -274,56 +569,83 @@ ngx_pcre_free_studies(void *data)
             i = 0;
         }
 
+        /*
+         * The PCRE JIT compiler uses mmap for its executable codes, so we
+         * have to explicitly call the pcre_free_study() function to free
+         * this memory.  In PCRE2, we call the pcre2_code_free() function
+         * for the same reason.
+         */
+
+#if (NGX_PCRE2)
+        pcre2_code_free(elts[i].regex);
+#else
         if (elts[i].regex->extra != NULL) {
             pcre_free_study(elts[i].regex->extra);
         }
+#endif
+    }
+#endif
+
+    /*
+     * On configuration parsing errors ngx_regex_module_init() will not
+     * be called.  Make sure ngx_regex_studies is properly cleared anyway.
+     */
+
+    ngx_regex_studies = NULL;
+
+#if (NGX_PCRE2)
+
+    /*
+     * Free compile context and match data.  If needed at runtime by
+     * the new cycle, these will be re-allocated.
+     */
+
+    if (ngx_regex_compile_context) {
+        pcre2_compile_context_free(ngx_regex_compile_context);
+        ngx_regex_compile_context = NULL;
+    }
+
+    if (ngx_regex_match_data) {
+        pcre2_match_data_free(ngx_regex_match_data);
+        ngx_regex_match_data = NULL;
+        ngx_regex_match_data_size = 0;
     }
-}
 
 #endif
+}
 
 
 static ngx_int_t
 ngx_regex_module_init(ngx_cycle_t *cycle)
 {
-    int               opt;
-    const char       *errstr;
-    ngx_uint_t        i;
-    ngx_list_part_t  *part;
-    ngx_regex_elt_t  *elts;
+    int                opt;
+#if !(NGX_PCRE2)
+    const char        *errstr;
+#endif
+    ngx_uint_t         i;
+    ngx_list_part_t   *part;
+    ngx_regex_elt_t   *elts;
+    ngx_regex_conf_t  *rcf;
 
     opt = 0;
 
-#if (NGX_HAVE_PCRE_JIT)
-    {
-    ngx_regex_conf_t    *rcf;
-    ngx_pool_cleanup_t  *cln;
-
     rcf = (ngx_regex_conf_t *) ngx_get_conf(cycle->conf_ctx, ngx_regex_module);
 
+#if (NGX_PCRE2 || NGX_HAVE_PCRE_JIT)
+
     if (rcf->pcre_jit) {
+#if (NGX_PCRE2)
+        opt = 1;
+#else
         opt = PCRE_STUDY_JIT_COMPILE;
-
-        /*
-         * The PCRE JIT compiler uses mmap for its executable codes, so we
-         * have to explicitly call the pcre_free_study() function to free
-         * this memory.
-         */
-
-        cln = ngx_pool_cleanup_add(cycle->pool, 0);
-        if (cln == NULL) {
-            return NGX_ERROR;
-        }
-
-        cln->handler = ngx_pcre_free_studies;
-        cln->data = ngx_pcre_studies;
-    }
+#endif
     }
+
 #endif
 
     ngx_regex_malloc_init(cycle->pool);
 
-    part = &ngx_pcre_studies->part;
+    part = &rcf->studies->part;
     elts = part->elts;
 
     for (i = 0; /* void */ ; i++) {
@@ -338,6 +660,23 @@ ngx_regex_module_init(ngx_cycle_t *cycle)
             i = 0;
         }
 
+#if (NGX_PCRE2)
+
+        if (opt) {
+            int  n;
+
+            n = pcre2_jit_compile(elts[i].regex, PCRE2_JIT_COMPLETE);
+
+            if (n != 0) {
+                ngx_log_error(NGX_LOG_INFO, cycle->log, 0,
+                              "pcre2_jit_compile() failed: %d in \"%s\", "
+                              "ignored",
+                              n, elts[i].name);
+            }
+        }
+
+#else
+
         elts[i].regex->extra = pcre_study(elts[i].regex->code, opt, &errstr);
 
         if (errstr != NULL) {
@@ -361,11 +700,15 @@ ngx_regex_module_init(ngx_cycle_t *cycle)
             }
         }
 #endif
+#endif
     }
 
     ngx_regex_malloc_done();
 
-    ngx_pcre_studies = NULL;
+    ngx_regex_studies = NULL;
+#if (NGX_PCRE2)
+    ngx_regex_compile_context = NULL;
+#endif
 
     return NGX_OK;
 }
@@ -374,7 +717,8 @@ ngx_regex_module_init(ngx_cycle_t *cycle)
 static void *
 ngx_regex_create_conf(ngx_cycle_t *cycle)
 {
-    ngx_regex_conf_t  *rcf;
+    ngx_regex_conf_t    *rcf;
+    ngx_pool_cleanup_t  *cln;
 
     rcf = ngx_pcalloc(cycle->pool, sizeof(ngx_regex_conf_t));
     if (rcf == NULL) {
@@ -383,11 +727,21 @@ ngx_regex_create_conf(ngx_cycle_t *cycle)
 
     rcf->pcre_jit = NGX_CONF_UNSET;
 
-    ngx_pcre_studies = ngx_list_create(cycle->pool, 8, sizeof(ngx_regex_elt_t));
-    if (ngx_pcre_studies == NULL) {
+    cln = ngx_pool_cleanup_add(cycle->pool, 0);
+    if (cln == NULL) {
         return NULL;
     }
 
+    cln->handler = ngx_regex_cleanup;
+    cln->data = rcf;
+
+    rcf->studies = ngx_list_create(cycle->pool, 8, sizeof(ngx_regex_elt_t));
+    if (rcf->studies == NULL) {
+        return NULL;
+    }
+
+    ngx_regex_studies = rcf->studies;
+
     return rcf;
 }
 
@@ -412,7 +766,21 @@ ngx_regex_pcre_jit(ngx_conf_t *cf, void *post, void *data)
         return NGX_CONF_OK;
     }
 
-#if (NGX_HAVE_PCRE_JIT)
+#if (NGX_PCRE2)
+    {
+    int       r;
+    uint32_t  jit;
+
+    jit = 0;
+    r = pcre2_config(PCRE2_CONFIG_JIT, &jit);
+
+    if (r != 0 || jit != 1) {
+        ngx_conf_log_error(NGX_LOG_WARN, cf, 0,
+                           "PCRE2 library does not support JIT");
+        *fp = 0;
+    }
+    }
+#elif (NGX_HAVE_PCRE_JIT)
     {
     int  jit, r;
 
diff --git a/src/core/ngx_regex.h b/src/core/ngx_regex.h
index 680486c81..182373a22 100644
--- a/src/core/ngx_regex.h
+++ b/src/core/ngx_regex.h
@@ -12,24 +12,38 @@
 #include <ngx_config.h>
 #include <ngx_core.h>
 
-#include <pcre.h>
 
+#if (NGX_PCRE2)
+
+#define PCRE2_CODE_UNIT_WIDTH  8
+#include <pcre2.h>
+
+#define NGX_REGEX_NO_MATCHED   PCRE2_ERROR_NOMATCH   /* -1 */
 
-#define NGX_REGEX_NO_MATCHED  PCRE_ERROR_NOMATCH   /* -1 */
+typedef pcre2_code  ngx_regex_t;
 
-#define NGX_REGEX_CASELESS    PCRE_CASELESS
+#else
+
+#include <pcre.h>
 
+#define NGX_REGEX_NO_MATCHED   PCRE_ERROR_NOMATCH    /* -1 */
 
 typedef struct {
     pcre        *code;
     pcre_extra  *extra;
 } ngx_regex_t;
 
+#endif
+
+
+#define NGX_REGEX_CASELESS     0x00000001
+#define NGX_REGEX_MULTILINE    0x00000002
+
 
 typedef struct {
     ngx_str_t     pattern;
     ngx_pool_t   *pool;
-    ngx_int_t     options;
+    ngx_uint_t    options;
 
     ngx_regex_t  *regex;
     int           captures;
@@ -49,10 +63,14 @@ typedef struct {
 void ngx_regex_init(void);
 ngx_int_t ngx_regex_compile(ngx_regex_compile_t *rc);
 
-#define ngx_regex_exec(re, s, captures, size)                                \
-    pcre_exec(re->code, re->extra, (const char *) (s)->data, (s)->len, 0, 0, \
-              captures, size)
-#define ngx_regex_exec_n      "pcre_exec()"
+ngx_int_t ngx_regex_exec(ngx_regex_t *re, ngx_str_t *s, int *captures,
+    ngx_uint_t size);
+
+#if (NGX_PCRE2)
+#define ngx_regex_exec_n       "pcre2_match()"
+#else
+#define ngx_regex_exec_n       "pcre_exec()"
+#endif
 
 ngx_int_t ngx_regex_exec_array(ngx_array_t *a, ngx_str_t *s, ngx_log_t *log);