apps: Add support for C++ apps alongside C ones

This means... C++ userland programs!!
Some parts of the standard library still have weird behavior. For example, do not try to use std::cout. That page-faults.

apps/Makefile

@@ -1,24 +1,32 @@
-APPS := init sh uname uptime hello ps ls args cat stat su session date mkdir screen
+C_APPS := init sh uname uptime hello ps ls args cat stat su session date mkdir screen
+CXX_APPS := hello-cpp
 
 APPS_DIR := $(LUNA_ROOT)/apps
 APPS_SRC := $(APPS_DIR)/src
 APPS_BIN := $(APPS_DIR)/bin
 
-REAL_APPS := $(patsubst %, $(APPS_BIN)/%, $(APPS))
+C_APPS_PATH := $(patsubst %, $(APPS_BIN)/%, $(C_APPS))
+CXX_APPS_PATH := $(patsubst %, $(APPS_BIN)/%, $(CXX_APPS))
 
 CFLAGS := -Wall -Wextra -Werror -Os -fno-asynchronous-unwind-tables -ffunction-sections -fdata-sections -Wl,--gc-sections
+CXXFLAGS := -fno-exceptions
 
 $(APPS_BIN)/%: $(APPS_SRC)/%.c
 	@mkdir -p $(@D)
 	@$(CC) $(CFLAGS) -o $@ $^
 	@echo "  CC $^"
 
-build: $(REAL_APPS)
+$(APPS_BIN)/%: $(APPS_SRC)/%.cpp
+	@mkdir -p $(@D)
+	@$(CXX) $(CFLAGS) $(CXXFLAGS) -o $@ $^
+	@echo "  CXX $^"
 
-install: $(REAL_APPS)
+build: $(C_APPS_PATH) $(CXX_APPS_PATH)
+
+install: $(C_APPS_PATH) $(CXX_APPS_PATH)
 	@mkdir -p $(LUNA_ROOT)/initrd/bin
-	@cp $(REAL_APPS) $(LUNA_ROOT)/initrd/bin
+	@cp $(C_APPS_PATH) $(CXX_APPS_PATH) $(LUNA_ROOT)/initrd/bin
-	@echo "  INSTALL $(REAL_APPS)"
+	@echo "  INSTALL $(C_APPS_PATH) $(CXX_APPS_PATH)"
 	@chmod a+s $(LUNA_ROOT)/initrd/bin/su
 
 clean:

apps/src/hello-cpp.cpp

@@ -0,0 +1,6 @@
+#include <cstdio>
+
+int main()
+{
+    printf("Well hello world!\n");
+}

kernel/src/sys/stat.cpp

@@ -13,7 +13,8 @@ struct stat // FIXME: This struct is quite stubbed out.
     ino_t st_ino;
     mode_t st_mode;
     off_t st_size;
-    int st_dev; // FIXME: Implement this.
+    int st_dev;   // FIXME: Implement this.
+    int st_nlink; // FIXME: Implement this.
     uid_t st_uid;
     gid_t st_gid;
     time_t st_atime;
@@ -37,6 +38,8 @@ void do_stat(Context* context, VFS::Node* node, struct stat* buf)
     kstat->st_atime = node->atime;
     kstat->st_ctime = node->ctime;
     kstat->st_mtime = node->mtime;
+    kstat->st_dev = 0;
+    kstat->st_nlink = 0;
     release_user_ref(kstat);
     context->rax = 0;
 }

libs/libc/Makefile

@@ -59,6 +59,8 @@ build: $(LIBC_BIN)/crt0.o $(LIBC_BIN)/crti.o $(LIBC_BIN)/crtn.o $(LIBC_BIN)/libc
 $(DESTDIR)/libc.a: $(LIBC_BIN)/libc.a
 	@mkdir -p $(@D)
 	@cp $^ $@
+	@rm -f $(DESTDIR)/libm.a
+	@ln -s $@ $(DESTDIR)/libm.a
 	@echo "  INSTALL $^"
 
 $(DESTDIR)/crt0.o: $(LIBC_BIN)/crt0.o

libs/libc/include/dirent.h

@@ -14,6 +14,15 @@ struct dirent
     char d_name[NAME_MAX];
 };
 
+#define DT_BLK 1     // This is a block device.
+#define DT_CHR 2     // This is a character device.
+#define DT_DIR 3     // This is a directory.
+#define DT_FIFO 4    // This is a named pipe (FIFO).
+#define DT_LNK 5     // This is a symbolic link.
+#define DT_REG 6     // This is a regular file.
+#define DT_SOCK 7    // This is a UNIX domain socket.
+#define DT_UNKNOWN 0 // The file type could not be determined.
+
 /* A stream representing a directory. */
 typedef struct
 {

libs/libc/include/errno.h

@@ -44,6 +44,7 @@ extern int errno;
 #define ENOTEMPTY 39    // Directory not empty. Not implemented.
 #define ELOOP 40        // Too many levels of symbolic links. Not implemented.
 #define ENOMSG 42       // No message of desired type. Not implemented.
+#define EOVERFLOW 75    // Value too large for defined data type. Not implemented.
 #define EILSEQ 84       // Invalid or incomplete multibyte or wide character. Not implemented.
 #define ENOTSOCK 88     // Socket operation on non-socket. Not implemented.
 #define ENOTSUP 95      // Operation not supported
@@ -57,23 +58,23 @@ extern int errno;
 
 // FIXME: Right now I don't want to have to order and label these, since we have no net support anyways.
 #define EADDRNOTAVAIL -1
-#define EAFNOSUPPORT -1
+#define EAFNOSUPPORT -2
-#define ECONNABORTED -1
+#define ECONNABORTED -3
-#define ECONNREFUSED -1
+#define ECONNREFUSED -4
-#define EDESTADDRREQ -1
+#define EDESTADDRREQ -5
-#define EHOSTUNREACH -1
+#define EHOSTUNREACH -6
-#define EINPROGRESS -1
+#define EINPROGRESS -7
-#define EMSGSIZE -1
+#define EMSGSIZE -8
-#define ENETDOWN -1
+#define ENETDOWN -9
-#define ENETRESET -1
+#define ENETRESET -10
-#define ENETUNREACH -1
+#define ENETUNREACH -11
-#define ENOBUFS -1
+#define ENOBUFS -12
-#define ENOMSG -1
+#define ENOMSG -13
-#define ENOPROTOOPT -1
+#define ENOPROTOOPT -14
-#define ENOTCONN -1
+#define ENOTCONN -15
-#define ENOTSOCK -1
+#define ENOTSOCK -16
-#define EPROTONOSUPPORT -1
+#define EPROTONOSUPPORT -17
-#define EPROTOTYPE -1
+#define EPROTOTYPE -18
 
 #ifdef _GNU_SOURCE // Give it only to programs that ask for it.
 /* Name used to invoke calling program. Same value as argv[0] in main(), but can be used globally. */

libs/libc/include/locale.h

@@ -5,13 +5,42 @@
 #define LC_CTYPE 1
 #define LC_COLLATE 2
 #define LC_NUMERIC 3
+#define LC_MONETARY 4
+#define LC_TIME 5
+
+/* Structure representing numeric formatting information for the current locale. */
+struct lconv
+{
+    char* decimal_point;
+    char* thousands_sep;
+    char* grouping;
+    char* int_curr_symbol;
+    char* currency_symbol;
+    char* mon_decimal_point;
+    char* mon_thousands_sep;
+    char* mon_grouping;
+    char* positive_sign;
+    char* negative_sign;
+    char int_frac_digits;
+    char frac_digits;
+    char p_cs_precedes;
+    char p_sep_by_space;
+    char n_cs_precedes;
+    char n_sep_by_space;
+    char p_sign_posn;
+    char n_sign_posn;
+};
 
 #ifdef __cplusplus
 extern "C"
 {
 #endif
 
-    char* setlocale(int category, const char* locale); // Not implemented.
+    /* Set or query the current locale. */
+    char* setlocale(int category, const char* locale);
+
+    /* Retrieve numeric formatting information for the current locale. */
+    struct lconv* localeconv(void);
 
 #ifdef __cplusplus
 }

libs/libc/include/math.h

@@ -4,6 +4,13 @@
 typedef float float_t;
 typedef double double_t;
 
+#define FP_NAN 0
+#define FP_INFINITE 1
+#define FP_ZERO 2
+#define FP_SUBNORMAL 3
+#define FP_NORMAL 4
+#define fpclassify(x) __builtin_fpclassify(FP_NAN, FP_INFINITE, FP_ZERO, FP_SUBNORMAL, FP_ZERO, x)
+
 #ifdef __cplusplus
 extern "C"
 {

libs/libc/include/signal.h

@@ -6,4 +6,16 @@ typedef int sig_atomic_t; // On the x86, writes to aligned 32-bit and 64-bit int
 
 #define SIGINT 1 // Not implemented.
 
+#ifdef __cplusplus
+extern "C"
+{
+#endif
+
+    void (*signal(int sig, void (*func)(int)))(int); // Not implemented.
+    int raise(int sig);                              // Not implemented.
+
+#ifdef __cplusplus
+}
+#endif
+
 #endif

libs/libc/include/stdlib.h

@@ -63,6 +63,8 @@ extern "C"
     /* Returns an integer (of type unsigned long) parsed from the string str. */
     unsigned long strtoul(const char* str, char** endptr, int base);
 
+    double strtod(const char* str, char** endptr); // Not implemented.
+
     /* Returns an integer (of type long) parsed from the string str. */
     long strtol(const char* str, char** endptr, int base);
 

libs/libc/include/string.h

@@ -91,6 +91,8 @@ extern "C"
     __lc_deprecated("strcat is unsafe and should not be used; use strncat instead") char* strcat(char* dest,
                                                                                                  const char* src);
 
+    char* strtok(char* str, const char* delim); // Not implemented.
+
 #ifdef __cplusplus
 }
 #endif

libs/libc/include/sys/stat.h

@@ -9,7 +9,8 @@ struct stat // FIXME: This struct is quite stubbed out.
     ino_t st_ino;
     mode_t st_mode;
     off_t st_size;
-    int st_dev; // Not implemented.
+    int st_dev;   // Not implemented.
+    int st_nlink; // Not implemented.
     uid_t st_uid;
     gid_t st_gid;
     time_t st_atime;
@@ -35,6 +36,10 @@ struct stat // FIXME: This struct is quite stubbed out.
 /* Is it a character device? */
 #define S_ISCHR(mode) (__S_IFCMP((mode), S_IFCHR))
 
+// Not implemented.
+#define S_ISBLK(mode) ((mode)&0)
+#define S_ISFIFO(mode) ((mode)&0)
+
 #define S_IRWXU 0700
 #define S_IRUSR 0400
 #define S_IWUSR 0200

libs/libc/src/cxxabi.cpp

@@ -0,0 +1,50 @@
+typedef void* (*cxa_atexit_func_t)(void*);
+
+struct cxa_atexit_entry
+{
+    cxa_atexit_func_t function;
+    void* argument;
+    void* dso_handle;
+};
+
+#define CXA_ATEXIT_MAX 64
+
+int cxa_atexit_entry_count = 0;
+
+cxa_atexit_entry cxa_atexit_entries[CXA_ATEXIT_MAX];
+
+extern "C"
+{
+    int __cxa_atexit(cxa_atexit_func_t func, void* arg, void* dso)
+    {
+        if (cxa_atexit_entry_count >= CXA_ATEXIT_MAX) return -1;
+        cxa_atexit_entries[cxa_atexit_entry_count].function = func;
+        cxa_atexit_entries[cxa_atexit_entry_count].argument = arg;
+        cxa_atexit_entries[cxa_atexit_entry_count].dso_handle = dso;
+        cxa_atexit_entry_count++;
+        return 0;
+    }
+
+    void __cxa_finalize(void* f)
+    {
+        int i = cxa_atexit_entry_count;
+        if (!f)
+        {
+            while (i--)
+            {
+                if (cxa_atexit_entries[i].function) { cxa_atexit_entries[i].function(cxa_atexit_entries[i].argument); }
+            }
+        }
+        else
+        {
+            while (i--)
+            {
+                if (cxa_atexit_entries[i].function == (cxa_atexit_func_t)f)
+                {
+                    cxa_atexit_entries[i].function(cxa_atexit_entries[i].argument);
+                    cxa_atexit_entries[i].function = 0;
+                }
+            }
+        }
+    }
+}

libs/libc/src/dirent.cpp

@@ -46,7 +46,7 @@ extern "C"
         result.d_ino = ent.inode;
         result.d_reclen = sizeof(result);
         result.d_off = ent.offset;
-        result.d_type = 0;
+        result.d_type = DT_UNKNOWN;
         strlcpy(result.d_name, ent.name, NAME_MAX);
         return &result;
     }

libs/libc/src/locale.cpp

@@ -1,12 +1,25 @@
+#include <limits.h>
 #include <locale.h>
 #include <luna.h>
 
 static char default_locale[] = "C";
 
+static char dot[] = ".";
+static char empty[] = "";
+
+static struct lconv default_lconv = {dot,      empty,    empty,    empty,    empty,    empty,
+                                     empty,    empty,    empty,    empty,    CHAR_MAX, CHAR_MAX,
+                                     CHAR_MAX, CHAR_MAX, CHAR_MAX, CHAR_MAX, CHAR_MAX, CHAR_MAX};
+
 extern "C"
 {
     char* setlocale(int, const char*)
     {
         return default_locale;
     }
+
+    struct lconv* localeconv(void)
+    {
+        return &default_lconv;
+    }
 }

libs/libc/src/signal.cpp

@@ -0,0 +1,15 @@
+#include <luna.h>
+#include <signal.h>
+
+extern "C"
+{
+    void (*signal(int, void (*)(int)))(int)
+    {
+        NOT_IMPLEMENTED("signal");
+    }
+
+    int raise(int)
+    {
+        NOT_IMPLEMENTED("raise");
+    }
+}

libs/libc/src/stdlib.cpp

@@ -303,4 +303,9 @@ extern "C"
         if (errno) return NULL;
         return str;
     }
+
+    double strtod(const char*, char**)
+    {
+        NOT_IMPLEMENTED("strtod");
+    }
 }

libs/libc/src/string.cpp

@@ -1,4 +1,5 @@
 #include <errno.h>
+#include <luna.h>
 #include <stdlib.h>
 #include <string.h>
 
@@ -295,4 +296,9 @@ extern "C"
     }
 
 #pragma GCC pop_options
+
+    char* strtok(char*, const char*)
+    {
+        NOT_IMPLEMENTED("strtok");
+    }
 }

tools/setup-gcc.sh

@@ -58,3 +58,12 @@ echo Installing GCC...
 
 make install-gcc | filter-lines "gcc" "install"
 make install-target-libgcc | filter-lines "libgcc" "install"
+
+echo Building libstdc++...
+
+$LUNA_ROOT/tools/sync-libc.sh # libstdc++ needs libc to be built
+make all-target-libstdc++v3 -j$(nproc) | filter-lines "libstdc++" "build"
+
+echo Installing libstdc++...
+
+make install-target-libstdc++v3 | filter-lines "libstdc++" "install"