kernel: add c++ support

Makefile

@@ -22,7 +22,8 @@ include arch/$(SOCKS_ARCH)/config.mk
 
 KERNEL_SRC_DIRS := init kernel vm ds util obj sched test
 KERNEL_C_FILES := $(foreach dir,$(KERNEL_SRC_DIRS),$(wildcard $(dir)/*.c))
-KERNEL_OBJ := $(addprefix $(BUILD_DIR)/,$(KERNEL_C_FILES:.c=.o))
+KERNEL_CXX_FILES := $(foreach dir,$(KERNEL_SRC_DIRS),$(wildcard $(dir)/*.cpp))
+KERNEL_OBJ := $(addprefix $(BUILD_DIR)/,$(KERNEL_C_FILES:.c=.o) $(KERNEL_CXX_FILES:.cpp=.o))
 
 ####################################
 # Kernel libc source files
@@ -34,9 +35,10 @@ LIBC_OBJ := $(addprefix $(BUILD_DIR)/,$(LIBC_C_FILES:.c=.o))
 
 BUILD_ID := $(shell tools/generate_build_id.py --arch $(SOCKS_ARCH))
 
-CFLAGS := $(CFLAGS) -DBUILD_ID=\"$(BUILD_ID)\" -g -Wall -Werror -pedantic \
+CFLAGS := $(CFLAGS) -DBUILD_ID=\"$(BUILD_ID)\" -g -Wall -Werror -pedantic -fPIC \
 	-Iinclude -Iarch/$(SOCKS_ARCH)/include -Ilibc/include -Wno-language-extension-token
 
+CXXFLAGS := $(CFLAGS) $(CXXFLAGS)
 ASMFLAGS := $(ASMFLAGS) -DBUILD_ID=\"$(BUILD_ID)\"
 LDFLAGS := $(LDFLAGS) -g -lgcc
 
@@ -64,6 +66,11 @@ $(BUILD_DIR)/%.o: %.c
 	@mkdir -p $(@D)
 	@$(CC) $< -o $@ -c $(CFLAGS) $(ARCH_CFLAGS) -MMD
 
+$(BUILD_DIR)/%.o: %.cpp
+	@printf "    \033[1;32mCXX\033[0m    \033[35m$(KERNEL_EXEC)\033[0m/$<\n"
+	@mkdir -p $(@D)
+	@$(CXX) $< -o $@ -c $(CXXFLAGS) $(ARCH_CXXFLAGS) -MMD
+
 clean:
 	@printf "    \033[1;93mRM\033[0m     Deleting build files.\n"
 	@rm -rf $(BUILD_DIR)

arch/user/include/arch/stdcon.h

@@ -1,6 +1,14 @@
 #ifndef ARCH_STDCON_H_
 #define ARCH_STDCON_H_
 
+#ifdef __cplusplus
+extern "C" {
+#endif
+
 extern void stdcon_init(void);
 
+#ifdef __cplusplus
+}
+#endif
+
 #endif

arch/user/include/socks/machine/cpu.h

@@ -1,6 +1,10 @@
 #ifndef SOCKS_USER_CPU_H_
 #define SOCKS_USER_CPU_H_
 
+#ifdef __cplusplus
+extern "C" {
+#endif
+
 typedef struct ml_cpu_block {
 	int cpu_reserved;
 } ml_cpu_block;
@@ -12,4 +16,8 @@ extern int ml_cpu_block_use(ml_cpu_block *p);
 
 extern void ml_halt_cpu(void);
 
+#ifdef __cplusplus
+}
+#endif
+
 #endif

arch/user/include/socks/machine/hwlock.h

@@ -3,6 +3,10 @@
 
 #define ML_HWLOCK_INIT (0)
 
+#ifdef __cplusplus
+extern "C" {
+#endif
+
 typedef int ml_hwlock_t;
 
 extern void ml_hwlock_lock(ml_hwlock_t *lck);
@@ -11,4 +15,8 @@ extern void ml_hwlock_unlock(ml_hwlock_t *lck);
 extern void ml_hwlock_lock_irqsave(ml_hwlock_t *lck, unsigned long *flags);
 extern void ml_hwlock_unlock_irqrestore(ml_hwlock_t *lck, unsigned long flags);
 
+#ifdef __cplusplus
+}
+#endif
+
 #endif

arch/user/include/socks/machine/init.h

@@ -3,6 +3,10 @@
 
 #include <stdint.h>
 
+#ifdef __cplusplus
+extern "C" {
+#endif
+
 #define __X2(x) #x
 #define __X(x) __X2(x)
 
@@ -18,4 +22,8 @@
 
 extern int ml_init(uintptr_t arg);
 
+#ifdef __cplusplus
+}
+#endif
+
 #endif

arch/user/include/socks/machine/vm.h

@@ -3,6 +3,10 @@
 
 #include <stdint.h>
 
+#ifdef __cplusplus
+extern "C" {
+#endif
+
 extern uintptr_t __pagemap_base(void);
 extern uintptr_t __pagemap_limit(void);
 
@@ -23,4 +27,8 @@ extern uintptr_t __pagemap_limit(void);
 #define VM_PAGE_MIN_ORDER VM_PAGE_4K
 #define VM_PAGE_MAX_ORDER VM_PAGE_8M
 
+#ifdef __cplusplus
+}
+#endif
+
 #endif

arch/x86_64/acpi/apic.cpp

@@ -15,7 +15,10 @@
 
 static uint32_t *lapic_base;
 
-extern int check_apic(void);
+extern "C" {
+	/* defined in apic_ctrl.S */
+	extern int check_apic(void);
+}
 
 static uintptr_t apic_get_base(void)
 {
@@ -78,7 +81,7 @@ kern_status_t local_apic_enable(void)
 	}
 
 	apic_set_base(apic_get_base());
-	lapic_base = find_lapic(madt);
+	lapic_base = (uint32_t *)find_lapic(madt);
 
 	local_apic_write(0xF0, local_apic_read(0xF0) | 0x100);
 
@@ -104,11 +107,11 @@ static void init_all_ioapic(void)
 
 kern_status_t apic_init(void)
 {
-	static int bsp_id = -1;
+	static unsigned int bsp_id = (unsigned int)-1;
 
 	/* the bootstrap processor will be the first one ro call apic_init().
 	   it is responsible for initialising the I/O APICs */
-	if (bsp_id == -1) {
+	if (bsp_id == (unsigned int)-1) {
 		bsp_id = this_cpu();
 	}
 

arch/x86_64/include/arch/acpi.h

@@ -5,6 +5,10 @@
 #include <socks/status.h>
 #include <stdint.h>
 
+#ifdef __cplusplus
+extern "C" {
+#endif
+
 #define ACPI_MADT_LAPIC  0x00
 #define ACPI_MADT_IOAPIC 0x01
 #define ACPI_MADT_LAPIC_OVERRIDE 0x05
@@ -56,12 +60,12 @@ struct acpi_sdt {
 
 struct acpi_rsdt {
 	struct acpi_sdt r_header;
-	uint32_t r_tables[];
+	uint32_t r_tables[1];
 } __packed;
 
 struct acpi_xsdt {
 	struct acpi_sdt x_header;
-	uint64_t x_tables[];
+	uint64_t x_tables[1];
 } __packed;
 
 struct acpi_madt {
@@ -95,4 +99,8 @@ extern kern_status_t smp_init(void);
 
 extern struct acpi_sdt *acpi_find_sdt(uint32_t sig);
 
+#ifdef __cplusplus
+}
+#endif
+
 #endif

arch/x86_64/include/arch/e820.h

@@ -4,6 +4,14 @@
 #include <stddef.h>
 #include <arch/multiboot.h>
 
+#ifdef __cplusplus
+extern "C" {
+#endif
+
 extern void e820_scan(multiboot_memory_map_t *mmap, size_t len);
 
+#ifdef __cplusplus
+}
+#endif
+
 #endif

arch/x86_64/include/arch/gdt.h

@@ -4,6 +4,10 @@
 #include <socks/compiler.h>
 #include <stdint.h>
 
+#ifdef __cplusplus
+extern "C" {
+#endif
+
 #define NR_GDT_ENTRIES 5
 
 #define GDT_A_PRESENT		(1 << 7)
@@ -39,4 +43,8 @@ struct gdt_ptr {
 extern int gdt_init(struct gdt *gdt, struct gdt_ptr *gdtp);
 extern int gdt_load(struct gdt_ptr *gdtp);
 
+#ifdef __cplusplus
+}
+#endif
+
 #endif

arch/x86_64/include/arch/irq.h

@@ -5,6 +5,10 @@
 #include <socks/queue.h>
 #include <stdint.h>
 
+#ifdef __cplusplus
+extern "C" {
+#endif
+
 #define NR_IDT_ENTRIES 48
 
 typedef enum irq_vector {
@@ -68,4 +72,8 @@ extern int idt_load(struct idt_ptr *idtp);
 extern void hook_irq(irq_vector_t vec, irq_hook_t *hook);
 extern void unhook_irq(irq_vector_t vec, irq_hook_t *hook);
 
+#ifdef __cplusplus
+}
+#endif
+
 #endif

arch/x86_64/include/arch/msr.h

@@ -5,8 +5,16 @@
 
 #define MSR_GS_BASE 0xC0000101
 
+#ifdef __cplusplus
+extern "C" {
+#endif
+
 /* defined in cpu_ctrl.S */
 extern uint64_t rdmsr(uint32_t id);
 extern void wrmsr(uint32_t id, uint64_t val);
 
+#ifdef __cplusplus
+}
+#endif
+
 #endif

arch/x86_64/include/arch/paging.h

@@ -4,6 +4,10 @@
 #include <socks/types.h>
 #include <socks/compiler.h>
 
+#ifdef __cplusplus
+extern "C" {
+#endif
+
 #define PTE_PRESENT      0x01ULL
 #define PTE_RW           0x02ULL
 #define PTE_USR          0x04ULL
@@ -52,4 +56,8 @@ typedef enum page_size {
 extern int gigabyte_pages(void);
 extern int enable_nx(void);
 
+#ifdef __cplusplus
+}
+#endif
+
 #endif

arch/x86_64/include/arch/pit.h

@@ -1,8 +1,16 @@
 #ifndef ARCH_PIT_H_
 #define ARCH_PIT_H_
 
+#ifdef __cplusplus
+extern "C" {
+#endif
+
 extern void pit_start(unsigned int hz);
 extern void pit_stop(void);
 extern void pit_wait(unsigned int ticks);
 
+#ifdef __cplusplus
+}
+#endif
+
 #endif

arch/x86_64/include/arch/ports.h

@@ -3,6 +3,10 @@
 
 #include <stdint.h>
 
+#ifdef __cplusplus
+extern "C" {
+#endif
+
 extern uint8_t inportb(uint16_t port);
 extern uint16_t inportw(uint16_t port);
 extern uint32_t inportl(uint16_t port);
@@ -12,4 +16,8 @@ extern void outportl(uint16_t port, uint32_t data);
 extern void outportsw(uint16_t port, void *data, uint32_t size);
 extern void inportsw(uint16_t port, unsigned char *data, unsigned long size);
 
+#ifdef __cplusplus
+}
+#endif
+
 #endif

arch/x86_64/include/arch/serial.h

@@ -1,6 +1,10 @@
 #ifndef ARCH_SERIAL_H_
 #define ARCH_SERIAL_H_
 
+#ifdef __cplusplus
+extern "C" {
+#endif
+
 #define SERIAL_PORT_A 0x3F8
 #define SERIAL_PORT_B 0x2F8
 #define SERIAL_PORT_C 0x3E8
@@ -14,4 +18,8 @@ extern char serial_recv_byte(int device);
 
 extern int serial_rcvd(int device);
 
+#ifdef __cplusplus
+}
+#endif
+
 #endif

arch/x86_64/include/arch/vgacon.h

@@ -1,6 +1,14 @@
 #ifndef ARCH_VGACON_H_
 #define ARCH_VGACON_H_
 
+#ifdef __cplusplus
+extern "C" {
+#endif
+
 extern void vgacon_init(void);
 
+#ifdef __cplusplus
+}
+#endif
+
 #endif

arch/x86_64/include/socks/machine/cpu.h

@@ -4,6 +4,10 @@
 #include <arch/gdt.h>
 #include <arch/irq.h>
 
+#ifdef __cplusplus
+extern "C" {
+#endif
+
 #define ml_cpu_block_get_id(p) ((p)->c_cpu_id)
 
 typedef struct ml_cpu_block {
@@ -28,4 +32,8 @@ extern int ml_cpu_block_use(ml_cpu_block *p);
 extern void ml_halt_cpu(void);
 extern ml_cpu_block *ml_this_cpu(void);
 
+#ifdef __cplusplus
+}
+#endif
+
 #endif

arch/x86_64/include/socks/machine/hwlock.h

@@ -3,6 +3,10 @@
 
 #define ML_HWLOCK_INIT (0)
 
+#ifdef __cplusplus
+extern "C" {
+#endif
+
 typedef int ml_hwlock_t;
 
 extern void ml_hwlock_lock(ml_hwlock_t *lck);
@@ -11,4 +15,8 @@ extern void ml_hwlock_unlock(ml_hwlock_t *lck);
 extern void ml_hwlock_lock_irqsave(ml_hwlock_t *lck, unsigned long *flags);
 extern void ml_hwlock_unlock_irqrestore(ml_hwlock_t *lck, unsigned long flags);
 
+#ifdef __cplusplus
+}
+#endif
+
 #endif

arch/x86_64/include/socks/machine/init.h

@@ -3,6 +3,10 @@
 
 #include <stdint.h>
 
+#ifdef __cplusplus
+extern "C" {
+#endif
+
 #define __X2(x) #x
 #define __X(x) __X2(x)
 
@@ -12,4 +16,8 @@
 
 extern int ml_init(uintptr_t arg);
 
+#ifdef __cplusplus
+}
+#endif
+
 #endif

include/socks/bitmap.h

@@ -3,6 +3,10 @@
 
 #include <stdbool.h>
 
+#ifdef __cplusplus
+extern "C" {
+#endif
+
 #define BITS_PER_WORD (8 * sizeof(unsigned long))
 #define __DIV_ROUND_UP(n, d) (((n) + (d) - 1) / (d))
 #define BITMAP_WORDS(nbits) __DIV_ROUND_UP(nbits, BITS_PER_WORD)
@@ -23,4 +27,8 @@ extern unsigned int bitmap_highest_clear(unsigned long *map, unsigned long nbits
 extern unsigned int bitmap_lowest_set(unsigned long *map, unsigned long nbits);
 extern unsigned int bitmap_lowest_clear(unsigned long *map, unsigned long nbits);
 
+#ifdef __cplusplus
+}
+#endif
+
 #endif

include/socks/btree.h

@@ -25,6 +25,10 @@
 
 #include <stdint.h>
 
+#ifdef __cplusplus
+extern "C" {
+#endif
+
 /* if your custom structure contains a btree_node_t (i.e. it can be part of a btree),
    you can use this macro to convert a btree_node_t* to a your_type*
 
@@ -370,4 +374,8 @@ static inline unsigned short btree_height(btree_node_t *node)
 	return node->b_height;
 }
 
+#ifdef __cplusplus
+}
+#endif
+
 #endif

include/socks/console.h

@@ -18,6 +18,10 @@
 #include <socks/locks.h>
 #include <socks/status.h>
 
+#ifdef __cplusplus
+extern "C" {
+#endif
+
 typedef enum console_flags {
 	/* console is only used during the boot process. the console
 	   will be automatically de-registered when the first
@@ -42,4 +46,8 @@ extern kern_status_t console_unregister(console_t *con);
 extern void console_write(console_t *con, const char *s, unsigned int len);
 extern int console_read(console_t *con, char *s, unsigned int len);
 
+#ifdef __cplusplus
+}
+#endif
+
 #endif

include/socks/cpu.h

@@ -4,6 +4,10 @@
 #include <socks/machine/cpu.h>
 #include <socks/sched.h>
 
+#ifdef __cplusplus
+extern "C" {
+#endif
+
 typedef enum cpu_flags {
 	CPU_ONLINE = 0x01u,
 } cpu_flags_t;
@@ -30,4 +34,8 @@ extern void cpu_set_online(unsigned int cpu_id);
 
 extern unsigned int cpu_get_highest_available(void);
 
+#ifdef __cplusplus
+}
+#endif
+
 #endif

include/socks/init.h

@@ -4,6 +4,10 @@
 #include <socks/compiler.h>
 #include <socks/machine/init.h>
 
+#ifdef __cplusplus
+extern "C" {
+#endif
+
 typedef int (*initcall_t)(void);
 
 #define INITLEVEL_EARLY       0
@@ -30,4 +34,8 @@ extern void print_kernel_banner(void);
 extern int do_initcalls(void);
 extern int start_initlevel(int level);
 
+#ifdef __cplusplus
+}
+#endif
+
 #endif

include/socks/locks.h

@@ -4,6 +4,10 @@
 #include <socks/compiler.h>
 #include <socks/machine/hwlock.h>
 
+#ifdef __cplusplus
+extern "C" {
+#endif
+
 typedef __aligned(8) ml_hwlock_t spin_lock_t;
 
 #define SPIN_LOCK_INIT ML_HWLOCK_INIT
@@ -11,4 +15,8 @@ typedef __aligned(8) ml_hwlock_t spin_lock_t;
 #define spin_lock_irqsave(lck, flags) ml_hwlock_lock_irqsave(lck, flags);
 #define spin_unlock_irqrestore(lck, flags) ml_hwlock_unlock_irqrestore(lck, flags);
 
+#ifdef __cplusplus
+}
+#endif
+
 #endif

include/socks/memblock.h

@@ -26,6 +26,10 @@
 #include <limits.h>
 #include <socks/types.h>
 
+#ifdef __cplusplus
+extern "C" {
+#endif
+
 #define MEMBLOCK_INIT_MEMORY_REGION_COUNT 128
 #define MEMBLOCK_INIT_RESERVED_REGION_COUNT 128
 
@@ -319,4 +323,8 @@ extern void __next_memory_region(memblock_iter_t *it, \
 		memblock_type_t *type_a, memblock_type_t *type_b,
 		phys_addr_t start, phys_addr_t end);
 
+#ifdef __cplusplus
+}
+#endif
+
 #endif

include/socks/object.h

@@ -6,6 +6,10 @@
 #include <socks/vm.h>
 #include <stddef.h>
 
+#ifdef __cplusplus
+extern "C" {
+#endif
+
 #define OBJECT_MAGIC 0xBADDCAFE
 #define OBJECT_NAME_MAX 64
 
@@ -19,7 +23,7 @@ typedef enum object_type_flags {
 typedef struct object_ops {
 	kern_status_t(*open)(struct object *obj);
 	kern_status_t(*close)(struct object *obj);
-	kern_status_t(*delete)(struct object *obj);
+	kern_status_t(*destroy)(struct object *obj);
 	kern_status_t(*query_name)(struct object *obj, char out[OBJECT_NAME_MAX]);
 	kern_status_t(*parse)(struct object *obj, const char *path, struct object **out);
 	kern_status_t(*get_named)(struct object *obj, const char *name, struct object **out);
@@ -89,4 +93,8 @@ extern bool object_is_set(object_t *obj);
 extern void init_set_objects(void);
 extern void init_global_namespace(void);
 
+#ifdef __cplusplus
+}
+#endif
+
 #endif

include/socks/percpu.h

@@ -4,6 +4,10 @@
 #include <socks/status.h>
 #include <socks/compiler.h>
 
+#ifdef __cplusplus
+extern "C" {
+#endif
+
 #define DEFINE_PERCPU_VAR(type, name) \
 	__section(".data.percpu") type name
 
@@ -14,4 +18,8 @@
 extern kern_status_t init_per_cpu_areas(void);
 extern void *__percpu_get(void *var);
 
+#ifdef __cplusplus
+}
+#endif
+
 #endif

include/socks/pmap.h

@@ -10,6 +10,10 @@
 
 #define PFN(x) ((x) >> VM_PAGE_SHIFT)
 
+#ifdef __cplusplus
+extern "C" {
+#endif
+
 typedef ml_pmap_t pmap_t;
 typedef ml_pfn_t pfn_t;
 
@@ -30,4 +34,8 @@ extern kern_status_t pmap_add_block(pmap_t pmap, void *p, pfn_t pfn, size_t len,
 extern kern_status_t pmap_remove(pmap_t pmap, void *p);
 extern kern_status_t pmap_remove_range(pmap_t pmap, void *p, size_t len);
 
+#ifdef __cplusplus
+}
+#endif
+
 #endif

include/socks/printk.h

@@ -3,7 +3,15 @@
 
 #include <socks/console.h>
 
+#ifdef __cplusplus
+extern "C" {
+#endif
+
 extern void early_printk_init(console_t *con);
 extern int printk(const char *format, ...);
 
+#ifdef __cplusplus
+}
+#endif
+
 #endif

include/socks/queue.h

@@ -4,6 +4,10 @@
 #include <socks/libc/string.h>
 #include <stdbool.h>
 
+#ifdef __cplusplus
+extern "C" {
+#endif
+
 #define QUEUE_CONTAINER(t, m, v) ((void *)((v) ? (uintptr_t)(v) - (offsetof(t, m)) : 0))
 
 #define QUEUE_INIT ((queue_t){ .q_first = NULL, .q_last = NULL })
@@ -51,4 +55,8 @@ extern queue_entry_t *queue_pop_back(queue_t *q);
 extern void queue_delete(queue_t *q, queue_entry_t *entry);
 extern void queue_delete_all(queue_t *q);
 
+#ifdef __cplusplus
+}
+#endif
+
 #endif

include/socks/sched.h

@@ -11,6 +11,10 @@
 #define TASK_NAME_MAX 64
 #define PRIO_MAX 32
 
+#ifdef __cplusplus
+extern "C" {
+#endif
+
 typedef enum task_state {
 	TASK_RUNNING,
 	TASK_STOPPED,
@@ -73,7 +77,7 @@ extern kern_status_t sched_init(void);
 extern void runqueue_init(runqueue_t *rq);
 
 extern task_t *task_alloc(void);
-static inline task_t *task_ref(task_t *task) { return object_data(object_ref(object_header(task))); }
+static inline task_t *task_ref(task_t *task) { return (task_t *)object_data(object_ref(object_header(task))); }
 static inline void task_deref(task_t *task) { object_deref(object_header(task)); }
 extern task_t *task_from_pid(unsigned int pid);
 extern task_t *kernel_task(void);
@@ -90,4 +94,8 @@ static inline void task_unlock_irqrestore(task_t *task, unsigned long flags)
 
 extern thread_t *thread_alloc(void);
 
+#ifdef __cplusplus
+}
+#endif
+
 #endif

include/socks/test.h

@@ -1,6 +1,14 @@
 #ifndef SOCKS_TEST_H_
 #define SOCKS_TEST_H_
 
+#ifdef __cplusplus
+extern "C" {
+#endif
+
 extern int run_all_tests(void);
 
+#ifdef __cplusplus
+}
+#endif
+
 #endif

include/socks/tty.h

@@ -20,6 +20,10 @@
        device, a serial port, etc.
 */
 
+#ifdef __cplusplus
+extern "C" {
+#endif
+
 /* opaque context pointer for use by the tty driver */
 typedef void *tty_driver_ctx_t;
 
@@ -84,4 +88,8 @@ extern void tty_destroy(tty_t *tty);
 extern int tty_read(tty_t *tty, char *s, unsigned long len);
 extern int tty_write(tty_t *tty, const char *s, unsigned long len);
 
+#ifdef __cplusplus
+}
+#endif
+
 #endif

include/socks/util.h

@@ -5,6 +5,10 @@
 #include <stdint.h>
 #include <stdbool.h>
 
+#ifdef __cplusplus
+extern "C" {
+#endif
+
 extern void data_size_to_string(size_t value, char *out, size_t outsz);
 static inline bool power_of_2(size_t x) { return (x > 0 && (x & (x - 1)) == 0); }
 static inline unsigned long long div64_pow2(unsigned long long x, unsigned long long y)
@@ -17,4 +21,8 @@ static inline unsigned long long absdiff64(unsigned long long x, unsigned long l
 	return x > y ? y - x : x - y;
 }
 
+#ifdef __cplusplus
+}
+#endif
+
 #endif

include/socks/vm.h

@@ -8,6 +8,10 @@
 #include <socks/locks.h>
 #include <socks/machine/vm.h>
 
+#ifdef __cplusplus
+extern "C" {
+#endif
+
 /* maximum number of NUMA nodes */
 #define VM_MAX_NODES 64
 /* maximum number of memory zones per node */
@@ -185,8 +189,9 @@ typedef struct vm_slab {
 	   when freeing:
 	     - s_free should be set to the index of the object being freed.
 	     - s_freelist[s_free] should be set to the previous value of s_free.
+	   this is commented as it as flexible arrays are not supported in c++.
 	   */
-	unsigned int s_freelist[];
+	//unsigned int s_freelist[];
 } vm_slab_t;
 
 typedef struct vm_page {
@@ -212,9 +217,7 @@ typedef struct vm_page {
 
 	/* owner-specific data */
 	union {
-		struct {
+		vm_slab_t *p_slab;
-			vm_slab_t *p_slab;
-		};
 	};
 
 } __attribute__((aligned(2 * sizeof(unsigned long)))) vm_page_t;
@@ -287,4 +290,8 @@ extern void vm_sparse_init(void);
 extern vm_page_t *vm_page_get_sparse(phys_addr_t addr);
 extern size_t vm_page_get_pfn_sparse(vm_page_t *pg);
 
+#ifdef __cplusplus
+}
+#endif
+
 #endif

obj/object.c

@@ -85,8 +85,8 @@ void object_deref(object_t *obj)
 		return;
 	}
 
-	if (HAS_OP(obj, delete)) {
+	if (HAS_OP(obj, destroy)) {
-		obj->ob_type->ob_ops.delete(obj);
+		obj->ob_type->ob_ops.destroy(obj);
 	}
 
 	vm_cache_free(&obj->ob_type->ob_cache, obj);

tools/make/gcc-host.mk

@@ -1,7 +1,9 @@
 LD  := gcc
 CC  := gcc
+CXX := g++
 ASM := gcc
 
 CFLAGS   := -Wall -Werror -pedantic
+CXXFLAGS := $(CFLAGS)
 ASMFLAGS := $(CFLAGS)
 LDFLAGS  := -O2

tools/make/generate_compile_commands.py

@@ -5,7 +5,7 @@ import os
 
 
 def is_source_file(filepath):
-    return filepath.endswith('.c') or filepath.endswith('.h') or filepath.endswith('.S')
+    return filepath.endswith('.c') or filepath.endswith('.cpp') or filepath.endswith('.h') or filepath.endswith('.S')
 
 dir_stack = []
 rootdir = os.getcwd()
@@ -30,7 +30,7 @@ for line in make_output_lines:
         dir_stack.pop()
         continue;
 
-    if 'gcc' not in line_parts[0]:
+    if 'gcc' not in line_parts[0] and 'g++' not in line_parts[0]:
         continue
 
     src_file = ''

vm/cache.c

@@ -106,11 +106,12 @@ static vm_slab_t *alloc_slab(vm_cache_t *cache, vm_flags_t flags)
 	slab_hdr->s_obj_allocated = 0;
 	slab_hdr->s_free = 0;
 
+	unsigned int *freelist = (unsigned int *)(slab_hdr + 1);
 	for (unsigned int i = 0; i < cache->c_obj_count; i++) {
-		slab_hdr->s_freelist[i] = i + 1;
+		freelist[i] = i + 1;
 	}
 
-	slab_hdr->s_freelist[cache->c_obj_count - 1] = FREELIST_END;
+	freelist[cache->c_obj_count - 1] = FREELIST_END;
 
 	vm_page_foreach (slab_page, i) {
 		i->p_slab = slab_hdr;
@@ -131,7 +132,8 @@ static unsigned int slab_allocate_slot(vm_slab_t *slab)
 	}
 
 	unsigned int slot = slab->s_free;
-	slab->s_free = slab->s_freelist[slab->s_free];
+	unsigned int *freelist = (unsigned int *)(slab + 1);
+	slab->s_free = freelist[slab->s_free];
 	slab->s_obj_allocated++;
 
 	return slot;
@@ -140,8 +142,10 @@ static unsigned int slab_allocate_slot(vm_slab_t *slab)
 static void slab_free_slot(vm_slab_t *slab, unsigned int slot)
 {
 	unsigned int next = slab->s_free;
+	unsigned int *freelist = (unsigned int *)(slab + 1);
+
 	slab->s_free = slot;
-	slab->s_freelist[slot] = next;
+	freelist[slot] = next;
 	slab->s_obj_allocated--;
 }