work on dynamic extensions

CMakeLists.txt

@@ -7,7 +7,8 @@ message(${CMAKE_CXX_FLAGS_RELEASE})
 add_subdirectory("vendor/sol2")
 
 include_directories("include")
+include_directories("vendor/hotwire/src")
 include_directories("vendor/sol2/include")
 
-add_executable(grbc src/main.cc src/options.cc src/ext_easy.cc  src/utils.cc src/file.cc src/target_exe.cc src/platform.cc src/ninja.cc src/generator.cc src/target_lib.cc src/package.cc src/ext.cc src/ext_pkg_config.cc src/task.cc src/ext_profiles.cc)
+add_executable(grbc src/ext_dynamic.cc vendor/hotwire/src/dlopen.c src/main.cc src/options.cc src/ext_easy.cc  src/utils.cc src/file.cc src/target_exe.cc src/platform.cc src/ninja.cc src/generator.cc src/target_lib.cc src/package.cc src/ext.cc src/ext_pkg_config.cc src/task.cc src/ext_profiles.cc)
 target_link_libraries(grbc sol2 lua)

HConfig

@@ -2,6 +2,34 @@ grbc_want_version("1.0")
 grbc_ext("GRBC_EXT_pkg_config")
 grbc_ext("GRBC_EXT_profiles")
 grbc_ext("GRBC_EXT_easy")
+grbc_ext("GRBC_EXT_dynamic_extensions")
+
+local hotwire = grbc_library(LibraryConfig.new({
+    name = "libhotwire",
+    language_type = LanguageType.C,
+    files = {
+        grbc_file("vendor/hotwire/src/dlopen.c")
+    },
+    lib_type = LibraryType.Static,
+
+    requirements = {},
+    compile_flags = {},
+    linker_flags = {},
+
+    include_dirs = {
+        "vendor/hotwire/src",
+    },
+
+    package_config = PackageConfig.new({
+        name = "libhotwire",
+        libraries = {},
+        include_dirs = {
+            grbc_file("vendor/hotwire/src")
+        },
+        compile_flags = {},
+        linker_flags = {},
+    })
+}))
 
 local grbc_extensions = grbc_library(LibraryConfig.new({
     name = "libgrbc_extensions",
@@ -9,7 +37,8 @@ local grbc_extensions = grbc_library(LibraryConfig.new({
     files = {
         grbc_file("src/ext_pkg_config.cc"),
         grbc_file("src/ext_profiles.cc"),
-        grbc_file("src/ext_easy.cc")
+        grbc_file("src/ext_easy.cc"),
+        grbc_file("src/ext_dynamic.cc")
     },
     lib_type = LibraryType.Static,
 
@@ -19,6 +48,7 @@ local grbc_extensions = grbc_library(LibraryConfig.new({
 
     include_dirs = {
         "include",
+        "vendor/hotwire/src",
         "vendor/sol2/include"
     },
 
@@ -52,7 +82,9 @@ local grbc_lib = grbc_library(LibraryConfig.new({
     },
     lib_type = LibraryType.Static,
 
-    requirements = {},
+    requirements = {
+        grbc_pkg("libhotwire")
+    },
     compile_flags = {},
     linker_flags = {},
     include_dirs = {
@@ -82,7 +114,8 @@ local grbc_exe = grbc_executable(ExecutableConfig.new({
     requirements = {
         grbc_pkg_config("lua"),
         grbc_pkg("libgrbc"),
-        grbc_pkg("libgrbc_extensions")
+        grbc_pkg("libgrbc_extensions"),
+        grbc_pkg("libhotwire")
     },
     compile_flags = {},
     linker_flags = {},

build.ninja

@@ -1,5 +1,5 @@
 ### GENERATED BY THE GRBC BUILT-IN NINJA GENERATOR ###
-### GENERATED ON: 1727655668 ###
+### GENERATED ON: 1727740849 ###
 
 ## Default variables ##
 
@@ -41,79 +41,93 @@ rule archive
   command = rm -f $out; ar crs $out $in
   description = Creating static library $out
 
+## Compile: vendor/hotwire/src/dlopen.c ##
+
+build $builddir/vendor/hotwire/src/dlopen.o: cc vendor/hotwire/src/dlopen.c
+   p_cflags = -Ivendor/hotwire/src -g -O1 
+
+## Link: libhotwire.a ##
+
+build $builddir/libhotwire.a: archive $builddir/vendor/hotwire/src/dlopen.o
+
 ## Compile: src/ext_pkg_config.cc ##
 
 build $builddir/src/ext_pkg_config.o: cxx src/ext_pkg_config.cc
-   p_cflags = -Iinclude -Ivendor/sol2/include -g -O1 
+   p_cflags = -Iinclude -Ivendor/hotwire/src -Ivendor/sol2/include -g -O1 
 
 ## Compile: src/ext_profiles.cc ##
 
 build $builddir/src/ext_profiles.o: cxx src/ext_profiles.cc
-   p_cflags = -Iinclude -Ivendor/sol2/include -g -O1 
+   p_cflags = -Iinclude -Ivendor/hotwire/src -Ivendor/sol2/include -g -O1 
 
 ## Compile: src/ext_easy.cc ##
 
 build $builddir/src/ext_easy.o: cxx src/ext_easy.cc
-   p_cflags = -Iinclude -Ivendor/sol2/include -g -O1 
+   p_cflags = -Iinclude -Ivendor/hotwire/src -Ivendor/sol2/include -g -O1 
+
+## Compile: src/ext_dynamic.cc ##
+
+build $builddir/src/ext_dynamic.o: cxx src/ext_dynamic.cc
+   p_cflags = -Iinclude -Ivendor/hotwire/src -Ivendor/sol2/include -g -O1 
 
 ## Link: libgrbc_extensions.a ##
 
-build $builddir/libgrbc_extensions.a: archive $builddir/src/ext_pkg_config.o $builddir/src/ext_profiles.o $builddir/src/ext_easy.o
+build $builddir/libgrbc_extensions.a: archive $builddir/src/ext_pkg_config.o $builddir/src/ext_profiles.o $builddir/src/ext_easy.o $builddir/src/ext_dynamic.o
 
 ## Compile: src/file.cc ##
 
 build $builddir/src/file.o: cxx src/file.cc
-   p_cflags = -Iinclude -Ivendor/sol2/include -g -O1 
+   p_cflags = -Ivendor/hotwire/src -Iinclude -Ivendor/sol2/include -g -O1 
 
 ## Compile: src/ninja.cc ##
 
 build $builddir/src/ninja.o: cxx src/ninja.cc
-   p_cflags = -Iinclude -Ivendor/sol2/include -g -O1 
+   p_cflags = -Ivendor/hotwire/src -Iinclude -Ivendor/sol2/include -g -O1 
 
 ## Compile: src/platform.cc ##
 
 build $builddir/src/platform.o: cxx src/platform.cc
-   p_cflags = -Iinclude -Ivendor/sol2/include -g -O1 
+   p_cflags = -Ivendor/hotwire/src -Iinclude -Ivendor/sol2/include -g -O1 
 
 ## Compile: src/target_exe.cc ##
 
 build $builddir/src/target_exe.o: cxx src/target_exe.cc
-   p_cflags = -Iinclude -Ivendor/sol2/include -g -O1 
+   p_cflags = -Ivendor/hotwire/src -Iinclude -Ivendor/sol2/include -g -O1 
 
 ## Compile: src/utils.cc ##
 
 build $builddir/src/utils.o: cxx src/utils.cc
-   p_cflags = -Iinclude -Ivendor/sol2/include -g -O1 
+   p_cflags = -Ivendor/hotwire/src -Iinclude -Ivendor/sol2/include -g -O1 
 
 ## Compile: src/generator.cc ##
 
 build $builddir/src/generator.o: cxx src/generator.cc
-   p_cflags = -Iinclude -Ivendor/sol2/include -g -O1 
+   p_cflags = -Ivendor/hotwire/src -Iinclude -Ivendor/sol2/include -g -O1 
 
 ## Compile: src/target_lib.cc ##
 
 build $builddir/src/target_lib.o: cxx src/target_lib.cc
-   p_cflags = -Iinclude -Ivendor/sol2/include -g -O1 
+   p_cflags = -Ivendor/hotwire/src -Iinclude -Ivendor/sol2/include -g -O1 
 
 ## Compile: src/package.cc ##
 
 build $builddir/src/package.o: cxx src/package.cc
-   p_cflags = -Iinclude -Ivendor/sol2/include -g -O1 
+   p_cflags = -Ivendor/hotwire/src -Iinclude -Ivendor/sol2/include -g -O1 
 
 ## Compile: src/ext.cc ##
 
 build $builddir/src/ext.o: cxx src/ext.cc
-   p_cflags = -Iinclude -Ivendor/sol2/include -g -O1 
+   p_cflags = -Ivendor/hotwire/src -Iinclude -Ivendor/sol2/include -g -O1 
 
 ## Compile: src/task.cc ##
 
 build $builddir/src/task.o: cxx src/task.cc
-   p_cflags = -Iinclude -Ivendor/sol2/include -g -O1 
+   p_cflags = -Ivendor/hotwire/src -Iinclude -Ivendor/sol2/include -g -O1 
 
 ## Compile: src/options.cc ##
 
 build $builddir/src/options.o: cxx src/options.cc
-   p_cflags = -Iinclude -Ivendor/sol2/include -g -O1 
+   p_cflags = -Ivendor/hotwire/src -Iinclude -Ivendor/sol2/include -g -O1 
 
 ## Link: libgrbc.a ##
 
@@ -122,12 +136,12 @@ build $builddir/libgrbc.a: archive $builddir/src/file.o $builddir/src/ninja.o $b
 ## Compile: src/main.cc ##
 
 build $builddir/src/main.o: cxx src/main.cc
-   p_cflags =  -Iinclude -Ivendor/sol2/include -Iinclude -Ivendor/sol2/include  -g -O1 
+   p_cflags =  -Iinclude -Ivendor/sol2/include -Iinclude -Ivendor/hotwire/src -Ivendor/sol2/include -Ivendor/hotwire/src  -g -O1 
 
 ## Link: grbc ##
 
-build $builddir/grbc:  link_cxx $builddir/src/main.o | $builddir/libgrbc.a $builddir/libgrbc_extensions.a
+build $builddir/grbc:  link_cxx $builddir/src/main.o | $builddir/libgrbc.a $builddir/libgrbc_extensions.a $builddir/libhotwire.a
-  p_linker_flags = -llua -lm -ldl build/libgrbc.a build/libgrbc_extensions.a  -Lbuild -Wl,-rpath,build:. 
+  p_linker_flags = -llua -lm -ldl build/libgrbc.a build/libgrbc_extensions.a build/libhotwire.a  -Lbuild -Wl,-rpath,build:. 
   p_cflags =  -g -O1 
 
 ## clean ##
@@ -144,6 +158,6 @@ rule compdb_task
 
 build compdb: compdb_task
 
-build all: phony $builddir/libgrbc_extensions.a $builddir/libgrbc.a $builddir/grbc 
+build all: phony $builddir/libhotwire.a $builddir/libgrbc_extensions.a $builddir/libgrbc.a $builddir/grbc 
 
 default all

compile_commands.json

@@ -1,25 +1,43 @@
 [
   {
     "directory": "/home/interfiber/dev/grbc",
-    "command": "/usr/lib64/ccache/g++ -MMD -MT build/src/ext_pkg_config.o -MF build/src/ext_pkg_config.o.d -Iinclude -Ivendor/sol2/include -g -O1  -c src/ext_pkg_config.cc -o build/src/ext_pkg_config.o",
+    "command": "/usr/lib64/ccache/gcc -MMD -MT build/vendor/hotwire/src/dlopen.o -MF build/vendor/hotwire/src/dlopen.o.d -Ivendor/hotwire/src -g -O1  -c vendor/hotwire/src/dlopen.c -o build/vendor/hotwire/src/dlopen.o",
+    "file": "vendor/hotwire/src/dlopen.c",
+    "output": "build/vendor/hotwire/src/dlopen.o"
+  },
+  {
+    "directory": "/home/interfiber/dev/grbc",
+    "command": "rm -f build/libhotwire.a; ar crs build/libhotwire.a build/vendor/hotwire/src/dlopen.o",
+    "file": "build/vendor/hotwire/src/dlopen.o",
+    "output": "build/libhotwire.a"
+  },
+  {
+    "directory": "/home/interfiber/dev/grbc",
+    "command": "/usr/lib64/ccache/g++ -MMD -MT build/src/ext_pkg_config.o -MF build/src/ext_pkg_config.o.d -Iinclude -Ivendor/hotwire/src -Ivendor/sol2/include -g -O1  -c src/ext_pkg_config.cc -o build/src/ext_pkg_config.o",
     "file": "src/ext_pkg_config.cc",
     "output": "build/src/ext_pkg_config.o"
   },
   {
     "directory": "/home/interfiber/dev/grbc",
-    "command": "/usr/lib64/ccache/g++ -MMD -MT build/src/ext_profiles.o -MF build/src/ext_profiles.o.d -Iinclude -Ivendor/sol2/include -g -O1  -c src/ext_profiles.cc -o build/src/ext_profiles.o",
+    "command": "/usr/lib64/ccache/g++ -MMD -MT build/src/ext_profiles.o -MF build/src/ext_profiles.o.d -Iinclude -Ivendor/hotwire/src -Ivendor/sol2/include -g -O1  -c src/ext_profiles.cc -o build/src/ext_profiles.o",
     "file": "src/ext_profiles.cc",
     "output": "build/src/ext_profiles.o"
   },
   {
     "directory": "/home/interfiber/dev/grbc",
-    "command": "/usr/lib64/ccache/g++ -MMD -MT build/src/ext_easy.o -MF build/src/ext_easy.o.d -Iinclude -Ivendor/sol2/include -g -O1  -c src/ext_easy.cc -o build/src/ext_easy.o",
+    "command": "/usr/lib64/ccache/g++ -MMD -MT build/src/ext_easy.o -MF build/src/ext_easy.o.d -Iinclude -Ivendor/hotwire/src -Ivendor/sol2/include -g -O1  -c src/ext_easy.cc -o build/src/ext_easy.o",
     "file": "src/ext_easy.cc",
     "output": "build/src/ext_easy.o"
   },
   {
     "directory": "/home/interfiber/dev/grbc",
-    "command": "rm -f build/libgrbc_extensions.a; ar crs build/libgrbc_extensions.a build/src/ext_pkg_config.o build/src/ext_profiles.o build/src/ext_easy.o",
+    "command": "/usr/lib64/ccache/g++ -MMD -MT build/src/ext_dynamic.o -MF build/src/ext_dynamic.o.d -Iinclude -Ivendor/hotwire/src -Ivendor/sol2/include -g -O1  -c src/ext_dynamic.cc -o build/src/ext_dynamic.o",
+    "file": "src/ext_dynamic.cc",
+    "output": "build/src/ext_dynamic.o"
+  },
+  {
+    "directory": "/home/interfiber/dev/grbc",
+    "command": "rm -f build/libgrbc_extensions.a; ar crs build/libgrbc_extensions.a build/src/ext_pkg_config.o build/src/ext_profiles.o build/src/ext_easy.o build/src/ext_dynamic.o",
     "file": "build/src/ext_pkg_config.o",
     "output": "build/libgrbc_extensions.a"
   },
@@ -97,20 +115,20 @@
   },
   {
     "directory": "/home/interfiber/dev/grbc",
-    "command": "/usr/lib64/ccache/g++ -MMD -MT build/src/main.o -MF build/src/main.o.d -Iinclude -Ivendor/sol2/include -Iinclude -Ivendor/sol2/include  -g -O1  -c src/main.cc -o build/src/main.o",
+    "command": "/usr/lib64/ccache/g++ -MMD -MT build/src/main.o -MF build/src/main.o.d -Iinclude -Ivendor/sol2/include -Iinclude -Ivendor/hotwire/src -Ivendor/sol2/include -Ivendor/hotwire/src  -g -O1  -c src/main.cc -o build/src/main.o",
     "file": "src/main.cc",
     "output": "build/src/main.o"
   },
   {
     "directory": "/home/interfiber/dev/grbc",
-    "command": "/usr/lib64/ccache/g++ -g -O1  -o build/grbc build/src/main.o -llua -lm -ldl build/libgrbc.a build/libgrbc_extensions.a  -Lbuild -Wl,-rpath,build:. ",
+    "command": "/usr/lib64/ccache/g++ -g -O1  -o build/grbc build/src/main.o -llua -lm -ldl build/libgrbc.a build/libgrbc_extensions.a build/libhotwire.a  -Lbuild -Wl,-rpath,build:. ",
     "file": "build/src/main.o",
     "output": "build/grbc"
   },
   {
     "directory": "/home/interfiber/dev/grbc",
     "command": "",
-    "file": "build/libgrbc_extensions.a",
+    "file": "build/libhotwire.a",
     "output": "all"
   }
 ]

example/HConfig

@@ -1,46 +0,0 @@
-grbc_want_version("1.0")
-grbc_ext("GRBC_EXT_profiles")
-
-local test_lib = grbc_library(LibraryConfig.new({
-    name = "libtest",
-    files = {
-        grbc_file("test.c")
-    },
-    requirements = {},
-    include_dirs = {
-        grbc_file("include")
-    },
-    lib_type = LibraryType.Shared,
-    compile_flags = {},
-    linker_flags = {},
-    package_config = PackageConfig.new({
-        name = "libtest",
-        libraries = {},
-        include_dirs = {
-            grbc_file("include")
-        },
-        compile_flags = {},
-        linker_flags = {}
-    })
-}))
-
-local hello_world = grbc_executable(ExecutableConfig.new({
-    name = "hello_world",
-    files = {
-        grbc_file("main.c")
-    },
-    requirements = {
-        grbc_pkg("libtest")
-    },
-    include_dirs = {},
-    compile_flags = {},
-    linker_flags = {}
-}))
-
-grbc_task(TaskConfig.new({
-    name = "Clean",
-    task_id = "clean",
-    shell_script = "ninja -t clean"
-}))
-
-grbc_build("ninja")

example/compile_commands.json

@@ -1,32 +0,0 @@
-[
-  {
-    "directory": "/home/interfiber/dev/grbc/example",
-    "command": "/usr/lib64/ccache/g++ -MMD -MT build/test.o -MF build/test.o.d -fPIC -Iinclude -c test.c -o build/test.o",
-    "file": "test.c",
-    "output": "build/test.o"
-  },
-  {
-    "directory": "/home/interfiber/dev/grbc/example",
-    "command": "/usr/lib64/ccache/g++  -o build/libtest.so build/test.o -shared -Lbuild -Wl,-rpath,build:. ",
-    "file": "build/test.o",
-    "output": "build/libtest.so"
-  },
-  {
-    "directory": "/home/interfiber/dev/grbc/example",
-    "command": "/usr/lib64/ccache/g++ -MMD -MT build/main.o -MF build/main.o.d -Iinclude  -c main.c -o build/main.o",
-    "file": "main.c",
-    "output": "build/main.o"
-  },
-  {
-    "directory": "/home/interfiber/dev/grbc/example",
-    "command": "/usr/lib64/ccache/g++  -o build/hello_world build/main.o build/libtest.so  -Lbuild -Wl,-rpath,build:. ",
-    "file": "build/main.o",
-    "output": "build/hello_world"
-  },
-  {
-    "directory": "/home/interfiber/dev/grbc/example",
-    "command": "",
-    "file": "build/libtest.so",
-    "output": "all"
-  }
-]

example/include/test.h

@@ -1,3 +0,0 @@
-#pragma once
-
-void test_function();

example/main.c

@@ -1,8 +0,0 @@
-#include <stdio.h>
-#include "test.h"
-
-int main() {
-    printf("Hello World!\n");
-
-    test_function();
-}

example/test.c

@@ -1,6 +0,0 @@
-#include "test.h"
-#include <stdio.h>
-
-void test_function() {
-    printf("void test_function();\n");
-}

fusion_ext/HConfig

@@ -0,0 +1,18 @@
+local grbc_extensions = grbc_library(LibraryConfig.new({
+    name = "libfusion",
+    language_type = LanguageType.Cpp,
+    files = {
+        grbc_file("src/ext_fusion.cc")
+    },
+    lib_type = LibraryType.Shared,
+
+    requirements = {},
+    compile_flags = {},
+    linker_flags = {},
+
+    include_dirs = {
+        "../vendor/sol2/include"
+    }
+}))
+
+grbc_build("ninja")

fusion_ext/README.txt

@@ -0,0 +1,2 @@
+FUSION GRBC EXTENSION
+

fusion_ext/build.ninja

@@ -1,5 +1,5 @@
 ### GENERATED BY THE GRBC BUILT-IN NINJA GENERATOR ###
-### GENERATED ON: 1727643213 ###
+### GENERATED ON: 1727735253 ###
 
 ## Default variables ##
 
@@ -41,35 +41,17 @@ rule archive
   command = rm -f $out; ar crs $out $in
   description = Creating static library $out
 
-## Compile: test.c ##
+## Compile: src/ext_fusion.cc ##
 
-build $builddir/test.o: cxx test.c
+build $builddir/src/ext_fusion.o: cxx src/ext_fusion.cc
-   p_cflags = -fPIC -Iinclude 
+   p_cflags = -fPIC -I../vendor/sol2/include
 
-## Link: libtest.so ##
+## Link: libfusion.so ##
 
-build $builddir/libtest.so:  link_cxx $builddir/test.o
+build $builddir/libfusion.so:  link_cxx $builddir/src/ext_fusion.o
-  p_linker_flags =  -shared -O3 -DNDEBUG -Lbuild -Wl,-rpath,build:. 
+  p_linker_flags =  -shared -Lbuild -Wl,-rpath,build:. 
   p_cflags = 
 
-## Compile: main.c ##
+build all: phony $builddir/libfusion.so 
-
-build $builddir/main.o: cxx main.c
-   p_cflags = -Iinclude  
-
-## Link: hello_world ##
-
-build $builddir/hello_world:  link_cxx $builddir/main.o | $builddir/libtest.so
-  p_linker_flags = build/libtest.so  -O3 -DNDEBUG -Lbuild -Wl,-rpath,build:. 
-  p_cflags =  
-
-## clean ##
-rule clean_task
-  command = ninja -t clean
-  description = Running task: Clean (clean)
-
-build clean: clean_task
-
-build all: phony $builddir/libtest.so $builddir/hello_world 
 
 default all

fusion_ext/src/ext_fusion.cc

@@ -0,0 +1,10 @@
+#include "grbc/spec.h"
+#include <sol/state.hpp>
+
+const char* GRBC_Get_Name() {
+    return "GRBC_EXT_Fusion";
+}
+
+void GRBC_Hook_Init(sol::state &lua) {
+    
+}

include/grbc/ext.h

@@ -5,12 +5,28 @@
 #define GRBC_EXT_pkg_config_NAME "GRBC_EXT_pkg_config"
 #define GRBC_EXT_profiles_NAME "GRBC_EXT_profiles"
 #define GRBC_EXT_easy_NAME "GRBC_EXT_easy"
+#define GRBC_EXT_dynamic_extensions_NAME "GRBC_EXT_dynamic_extensions"
 
+/// Called when the extension is loaded
 typedef void (*EXT_HookInit)(sol::state &lua);
 
+/// Called when the build completes
+typedef void (*EXT_HookBuildFinish)();
+
+/// Called everytime that a file is processed
+typedef void (*EXT_HookProcessFile)(const std::string &file);
+
+/// Called when the extension is invoked from the command line
+typedef void (*EXT_HookInvoke)();
+
 struct Extension {
     std::string name;
     bool loaded = false;
 
     EXT_HookInit hook_init = nullptr;
+    EXT_HookBuildFinish build_finish = nullptr;
+    EXT_HookProcessFile process_file = nullptr;
+    EXT_HookInvoke invoke = nullptr;
 };
+
+void grbc_ext_process_file(const std::string &file);

include/grbc/ext_dynamic.h

@@ -0,0 +1,7 @@
+#pragma once
+#include "grbc/ext.h"
+
+/**
+ * Get the grbc dynamic extension
+ */
+Extension grbc_dynamic();

spec/ext.md

@@ -8,8 +8,12 @@ Extensions are built into the grbc executable, and are loaded at runtime as need
 * GRBC_EXT_pkg_config
 * GRBC_EXT_profiles
 * GRBC_EXT_easy
+* GRBC_EXT_dynamic_extensions
 * GRBC_EXT_cmake [NOSUPPORT]
 
+## GRBC_EXT_dynamic_extensions
+Allows loading of extensions from shared object files. Extensions are searched for in: ```C:\grbc\ext```, or ```./grbc_ext```
+
 ## GRBC_EXT_pkg_config
 Pkg config support. UNIX only
 

src/ext.cc

@@ -45,3 +45,12 @@ bool grbc_is_ext_loaded(const std::string &extension_name) {
 
   return false;
 }
+
+void grbc_ext_process_file(const std::string &file) {
+  for (auto &ext : GState::get().extensions) {
+    if (!ext.loaded || ext.process_file == nullptr)
+      continue;
+
+    ext.process_file(file);
+  }
+}

src/ext_dynamic.cc

@@ -0,0 +1,72 @@
+#include "grbc/ext_dynamic.h"
+
+extern "C" {
+#include "dlopen.h"
+}
+
+#include "grbc/ext.h"
+#include "grbc/helpers.h"
+#include "grbc/spec.h"
+#include <filesystem>
+
+typedef const char *(*EXT_GetName)();
+
+void EXT_dynamic_ext(const std::string &extension_name) {
+  const std::array<std::string, 4 > extension_paths = {"./grbc_ext",
+                                                      "C:\\grbc\\ext", "./", "./build"};
+
+  std::filesystem::path good_extension_path;
+
+  for (size_t i = 0; i < extension_paths.size(); i++) {
+    std::filesystem::path extension_path =
+        std::filesystem::path(extension_paths[i]) /
+        std::filesystem::path(extension_name + ".grbcext");
+
+    if (std::filesystem::exists(extension_path)) {
+      good_extension_path = extension_path;
+
+      break;
+    } else {
+      log_msg(("no extension at: " + extension_path.generic_string()).c_str());
+    }
+  }
+
+  if (good_extension_path.empty())
+    grbc_exception("Failed to find GRBC dynamic extension!");
+
+  struct hotwire_dll_t dll = hw_dlopen(good_extension_path.c_str(), 0x00002);
+
+  EXT_HookInit hook_init = (EXT_HookInit)hw_dlsym(dll, "GRBC_Hook_Init");
+  EXT_GetName get_name = (EXT_GetName)hw_dlsym(dll, "GRBC_Get_Name");
+
+  if (hook_init == nullptr)
+    grbc_exception(
+        "Dynamic extension is missing public GRBC_Hook_Init symbol!");
+
+  if (get_name == nullptr)
+    grbc_exception("Dynamic extension is missing public GRBC_Get_Name symbol!");
+
+  Extension ext{};
+  ext.name = get_name();
+  ext.hook_init = hook_init;
+
+  log_msg(
+      ("loaded dynamic extension from: " + good_extension_path.generic_string())
+          .c_str());
+
+  grbc_register_ext(ext);
+}
+
+void grbc_dynamic_init(sol::state &lua) {
+  lua.set("grbc_dynamic_ext", EXT_dynamic_ext);
+
+  log_msg("dynamic extension support loaded!");
+}
+
+Extension grbc_dynamic() {
+  Extension ext{};
+  ext.name = GRBC_EXT_dynamic_extensions_NAME;
+  ext.hook_init = grbc_dynamic_init;
+
+  return ext;
+}

src/main.cc

@@ -1,3 +1,5 @@
+#include "grbc/ext.h"
+#include "grbc/ext_dynamic.h"
 #include "grbc/ext_easy.h"
 #include "grbc/ext_pkg_config.h"
 #include "grbc/ext_profiles.h"
@@ -15,6 +17,7 @@ void print_help() {
   printf("Author: Interfiber <webmaster@interfiber.dev>\n");
   printf("Commands:\n");
   printf("  gen - Generate build configuration from HConfig\n");
+  printf("  ext - Invoke a dynamic extension\n");
 }
 
 int main(int argc, char **argv) {
@@ -44,9 +47,6 @@ int main(int argc, char **argv) {
 
   GState::get().options = options;
 
-  if (std::string(argv[1]) == "gen") {
-    log_msg("running grbc generator...");
-
   log_msg("opening lua libraries...");
 
   auto &lua = GState::get().lua;
@@ -54,6 +54,25 @@ int main(int argc, char **argv) {
   lua.open_libraries(sol::lib::base, sol::lib::coroutine, sol::lib::string,
                      sol::lib::io, sol::lib::package, sol::lib::math);
 
+  if (std::string(argv[1]) == "ext") {
+    if (argc < 3) grbc_exception("expected argument 'dynamic_ext_path'");
+
+    log_msg("invoking extension...");
+
+    grbc_register_ext(grbc_dynamic()); // Register dynamic extensions
+
+    grbc_ext(GRBC_EXT_dynamic_extensions_NAME); // Load dynamic extension
+
+    lua.script("grbc_dynamic_ext('" + std::string(argv[2]) + "')");
+
+    Extension ext =
+        GState::get()
+            .extensions.front(); // Only one extension should be loaded!
+
+    ext.invoke(); // Invoke extension
+  } else if (std::string(argv[1]) == "gen") {
+    log_msg("running grbc generator...");
+
     log_msg("setting up runtime...");
 
     // TargetInfo
@@ -169,6 +188,7 @@ int main(int argc, char **argv) {
 
     grbc_register_ext(grbc_profiles());
     grbc_register_ext(grbc_easy());
+    grbc_register_ext(grbc_dynamic());
 
     // Detect platform
     log_msg("autodetecting platform...");

src/target_exe.cc

@@ -1,3 +1,4 @@
+#include "grbc/ext.h"
 #include "grbc/generator.h"
 #include "grbc/spec.h"
 #include "grbc/state.h"
@@ -50,6 +51,8 @@ TargetInfo grbc_executable(const ExecutableConfig &executable_config) {
     object_files.push_back(compile_cmd.object_file);
 
     target.compile_commands.push_back(compile_cmd);
+
+    grbc_ext_process_file(src_file);
   }
 
   // Final executable link

src/target_lib.cc

@@ -5,7 +5,8 @@
 TargetInfo grbc_library(const LibraryConfig &library_config) {
   TargetInfo target_config{};
 
-  if (library_config.name[0] != 'l' && library_config.name[1] != 'i' && library_config.name[2] != 'b') {
+  if (library_config.name[0] != 'l' && library_config.name[1] != 'i' &&
+      library_config.name[2] != 'b') {
     grbc_exception("library names are mandated to start with 'lib'");
   }
 
@@ -50,6 +51,8 @@ TargetInfo grbc_library(const LibraryConfig &library_config) {
     object_files.push_back(compile_cmd.object_file);
 
     target.compile_commands.push_back(compile_cmd);
+
+    grbc_ext_process_file(src_file);
   }
 
   // Libraries which need to be built before us