internal: use libsmarter

meson.build

@@ -53,11 +53,19 @@ if not headers_only
 	libc_deps += frigg_dep
 	rtdl_deps += frigg_dep
 
+	libsmarter_dep = dependency(
+		'libsmarter',
+		default_options: [],
+		fallback: ['libsmarter', 'libsmarter_dep'],
+	)
+	libc_deps += libsmarter_dep
+	rtdl_deps += libsmarter_dep
+
 	add_languages('c', 'cpp')
 	c_compiler = meson.get_compiler('c')
 
-	add_project_arguments('-Wno-unused-function', '-D__MLIBC_BUILDING_MLIBC', language: ['c', 'cpp'])
-	add_project_arguments('-nostdinc', '-fno-builtin', language: ['c', 'cpp'])
+	add_project_arguments('-D__MLIBC_BUILDING_MLIBC', '-DLIBSMARTER_FORCE_FREESTANDING', language: ['c', 'cpp'])
+	add_project_arguments('-nostdinc', '-fno-builtin', '-Wno-unused-function', language: ['c', 'cpp'])
 	add_project_arguments('-fno-rtti', '-fno-exceptions', language: 'cpp')
 	add_project_link_arguments('-nostdlib', language: ['c', 'cpp'])
 
@@ -259,6 +267,7 @@ endif
 rtdl_sources += [
 	'options/internal/gcc/stack_protector.cpp',
 	'options/internal/gcc/guard-abi.cpp',
+	'options/internal/gcc-extra/cxxabi.cpp',
 	'options/internal/generic/allocator.cpp',
 	'options/internal/generic/debug.cpp',
 	'options/internal/generic/ensure.cpp',

options/internal/gcc-extra/cxxabi.cpp

@@ -1,16 +1,18 @@
-
-#include <bits/ensure.h>
+#include <mlibc/allocator.hpp>
 
 // The cxxabi needs operator delete for *deleting* destructors, i.e., destructors that
 // are called by delete expressions. We never use such expressions in mlibc.
 // Note that G++ complains if we make the operator hidden,
-// thus we use it's mangled name as a workaround.
-#if defined(__clang__)
-	extern "C" [[gnu::visibility("hidden")]] void _ZdlPv() { // operator delete (void *, size_t)
-		__ensure(!"operator delete called! delete expressions cannot be used in mlibc.");
-	}
-#else
-	extern "C" [[gnu::visibility("hidden")]] void _ZdlPvm() { // operator delete (void *, size_t)
-		__ensure(!"operator delete called! delete expressions cannot be used in mlibc.");
-	}
-#endif
+// thus we use its mangled name as a workaround.
+
+extern "C" [[gnu::visibility("hidden")]] void *_Znwm(size_t size) { // operator new (size_t)
+	return getAllocator().allocate(size);
+}
+
+extern "C" [[gnu::visibility("hidden")]] void _ZdlPv(void *ptr) { // operator delete (void *)
+	getAllocator().free(ptr);
+}
+
+extern "C" [[gnu::visibility("hidden")]] void _ZdlPvm(void *ptr, size_t size) { // operator delete (void *, size_t)
+	getAllocator().deallocate(ptr, size);
+}

subprojects/libsmarter.wrap

@@ -0,0 +1,4 @@
+[wrap-git]
+directory = libsmarter
+url = https://github.com/managarm/libsmarter.git
+revision = master