Fix PCRE2 implementation and tests

.github/workflows/aarch64.yml

@@ -36,7 +36,7 @@ jobs:
       - name: Run stdlib specs
         uses: docker://jhass/crystal:1.0.0-alpine-build
         with:
-          args: make std_spec
+          args: make std_spec FLAGS=-Duse_pcre
   aarch64-musl-test-compiler:
     needs: aarch64-musl-build
     runs-on: [linux, ARM64]

.github/workflows/wasm32.yml

@@ -36,7 +36,7 @@ jobs:
           rm wasm32-wasi-libs.tar.gz
 
       - name: Build spec/wasm32_std_spec.cr
-        run: bin/crystal build spec/wasm32_std_spec.cr -o wasm32_std_spec.wasm --target wasm32-wasi
+        run: bin/crystal build spec/wasm32_std_spec.cr -o wasm32_std_spec.wasm --target wasm32-wasi -Duse_pcre
         env:
           CRYSTAL_LIBRARY_PATH: ${{ github.workspace }}/wasm32-wasi-libs
 

.github/workflows/win.yml

@@ -42,6 +42,7 @@ jobs:
         with:
           path: | # openssl and llvm take much longer to build so they are cached separately
             libs/pcre.lib
+            libs/pcre2-8.lib
             libs/iconv.lib
             libs/gc.lib
             libs/ffi.lib

spec/std/regex_spec.cr

@@ -211,7 +211,9 @@ describe "Regex" do
       {% else %}
         # Can't use regex literal because the *LIMIT_DEPTH verb is not supported in libpcre (only libpcre2)
         # and thus the compiler doesn't recognize it.
-        str.matches?(Regex.new("(*LIMIT_DEPTH=8192)^(?:[A-Za-z0-9+/]{4})*(?:[A-Za-z0-9+/]{2}==|[A-Za-z0-9+/]{3}=)?$"))
+        regex = Regex.new("(*LIMIT_DEPTH=8192)^(?:[A-Za-z0-9+/]{4})*(?:[A-Za-z0-9+/]{2}==|[A-Za-z0-9+/]{3}=)?$")
+        pending! "PCRE2 JIT mode not available." unless regex.@jit
+        str.matches?(regex)
       {% end %}
       # We don't care whether this actually matches or not, it's just to make
       # sure the engine does not stack overflow with a large string.

src/regex/lib_pcre2.cr

@@ -179,7 +179,7 @@ lib LibPCRE2
 
   fun get_error_message = pcre2_get_error_message_8(errorcode : Int, buffer : UInt8*, bufflen : LibC::SizeT) : Int
 
-  fun compile = pcre2_compile_8(pattern : UInt8*, length : LibC::SizeT, options : UInt32, errorcode : LibC::SizeT*, erroroffset : Int*, ccontext : CompileContext*) : Code*
+  fun compile = pcre2_compile_8(pattern : UInt8*, length : LibC::SizeT, options : UInt32, errorcode : Int*, erroroffset : LibC::SizeT*, ccontext : CompileContext*) : Code*
   fun code_free = pcre2_code_free_8(code : Code*) : Void
 
   type MatchContext = Void*
@@ -207,8 +207,10 @@ lib LibPCRE2
   fun get_ovector_pointer = pcre2_get_ovector_pointer_8(match_data : MatchData*) : LibC::SizeT*
   fun get_ovector_count = pcre2_get_ovector_count_8(match_data : MatchData*) : UInt32
 
-  # void *private_malloc(Int, void *);
-  # void  private_free(void *, void *);
-  fun general_context_create = pcre2_general_context_create_8(private_malloc : Void*, private_free : Void*, memory_data : Void*) : GeneralContext
+  fun general_context_create = pcre2_general_context_create_8(
+    private_malloc : LibC::SizeT, Void* -> Void,
+    private_free : Void*, Void* -> Void,
+    memory_data : Void*
+  ) : GeneralContext
   fun config = pcre2_config_8(what : UInt32, where : Void*) : Int
 end

src/regex/pcre2.cr

@@ -4,26 +4,29 @@ require "crystal/thread_local_value"
 # :nodoc:
 module Regex::PCRE2
   @re : LibPCRE2::Code*
+  @jit : Bool
 
   # :nodoc:
   def initialize(*, _source @source : String, _options @options)
     @re = PCRE2.compile(source, pcre2_options(options) | LibPCRE2::UTF | LibPCRE2::NO_UTF_CHECK | LibPCRE2::DUPNAMES | LibPCRE2::UCP) do |error_message|
       raise ArgumentError.new(error_message)
     end
 
-    jit_compile
+    @jit = jit_compile
   end
 
-  private def jit_compile : Nil
+  private def jit_compile : Bool
     ret = LibPCRE2.jit_compile(@re, LibPCRE2::JIT_COMPLETE)
     if ret < 0
       case error = LibPCRE2::Error.new(ret)
       when .jit_badoption?
         # okay
+        return false
       else
         raise ArgumentError.new("Regex JIT compile error: #{error}")
       end
     end
+    true
   end
 
   protected def self.compile(source, options, &)
@@ -135,7 +138,7 @@ module Regex::PCRE2
   end
 
   class_getter general_context do
-    LibPCRE2.general_context_create(->(size : LibC::Int, data : Void*) { GC.malloc(size) }.pointer, ->(pointer : Void*, data : Void*) { GC.free(pointer) }.pointer, nil)
+    LibPCRE2.general_context_create(->(size, _data) { GC.malloc(size) }, ->(pointer, _data) { GC.free(pointer) }, nil)
   end
 
   # Returns a JIT stack that's shared in the current thread.
@@ -153,7 +156,7 @@ module Regex::PCRE2
   private def match_data(str, byte_index, options)
     match_data = LibPCRE2.match_data_create_from_pattern(@re, Regex::PCRE2.general_context)
     match_context = LibPCRE2.match_context_create(nil)
-    LibPCRE2.jit_stack_assign(match_context, nil, Regex::PCRE2.jit_stack.as(Void*))
+    LibPCRE2.jit_stack_assign(match_context, nil, Regex::PCRE2.jit_stack.as(Void*)) if @jit
     match_count = LibPCRE2.match(@re, str, str.bytesize, byte_index, pcre2_options(options) | LibPCRE2::NO_UTF_CHECK, match_data, match_context)
 
     if match_count < 0
@@ -176,7 +179,7 @@ module Regex::PCRE2
 
   module MatchData
     # :nodoc:
-    def initialize(@regex : Regex, @code : LibPCRE2::Code*, @string : String, @pos : Int32, @ovector : UInt64*, @group_size : Int32)
+    def initialize(@regex : Regex, @code : LibPCRE2::Code*, @string : String, @pos : Int32, @ovector : LibC::SizeT*, @group_size : Int32)
     end
 
     private def byte_range(n, &)