diff options
Diffstat (limited to 'gdb/gmagic.c')
| -rw-r--r-- | gdb/gmagic.c | 1242 |
1 files changed, 1242 insertions, 0 deletions
diff --git a/gdb/gmagic.c b/gdb/gmagic.c new file mode 100644 index 0000000..4598218 --- /dev/null +++ b/gdb/gmagic.c @@ -0,0 +1,1242 @@ +#include "defs.h" +#include "gdbcmd.h" +#include "symtab.h" +#include "value.h" +#include "frame.h" +#include "breakpoint.h" +#include "inferior.h" +#include "gdbcore.h" +#include "gmagic.h" +#include <ctype.h> +#include <string.h> + +#ifdef DYNAMIC_COMMAND_SUPPORT +#include <dlfcn.h> +#endif + +#ifdef ANSI_PROTOTYPES +#include <stdarg.h> +#else +#include <varargs.h> +#endif + + +/* Maximum number of bytes of extra data to print, or UINT_MAX for no limit. + Note that "set extra-data-max 0" stores UINT_MAX in extra_data_max, which + displays in a show command as "unlimited." */ + +static unsigned int extra_data_max; +#define EXTRA_DATA_MAX_DEFAULT 1024 + +/* Return the number of elements in ARRAY. */ + +#define ARRAY_NELEMENTS(array) (sizeof (array) / sizeof (array[0])) + +/* Basic information about a text label */ + +struct text_label +{ + char *name; /* label name */ + CORE_ADDR addr; /* label value or 0 if label not found */ +}; + +/* Labels within the Magic Cap dispatcher that we need to know about + in order to implement "magic stepping" (that is, stepping over + Magic Cap method dispatches). The label addresses are refreshed + whenever a new symbol table is loaded. */ + +struct text_label dispatch_labels[] = +{ + {"__DispatchMethod", 0}, /* normal dispatch entry point */ + {"__DispatchInherited", 0}, /* inherited dispatch entry point */ + {"__DispatchDelegated", 0}, /* delegated dispatch entry point */ + {"__DispatchIntrinsic", 0}, /* intrinsic dispatch entry point */ + {"__DoDispatchMethodBpSite", 0}, /* do dispatch site */ +}; + +/* Accessors for the array above. */ + +#define DISPATCH_METHOD_ADDR dispatch_labels[0].addr +#define DISPATCH_INHERITED_ADDR dispatch_labels[1].addr +#define DISPATCH_DELEGATED_ADDR dispatch_labels[2].addr +#define DISPATCH_INTRINSIC_ADDR dispatch_labels[3].addr +#define DO_DISPATCH_METHOD_ADDR dispatch_labels[4].addr + +/* Cached value objects describing functions in the target program that + we call frequently. These are refreshed whenever a new symbol table + is loaded. */ + +static value_ptr remote_get_class_name_val; +static value_ptr remote_get_base_ptr_val; + +/* Nonzero means that "magic step" (stepping through the Magic Cap method + dispatcher to the dispatch target) is enabled. */ + +static int magic_step_enabled; + +/* function prototypes */ + +static void +print_object PARAMS ((char *args, int dump)); + +static void +get_class_name PARAMS ((unsigned long objectID, char **name, int *is_scripted)); + +static CORE_ADDR +get_base_ptr PARAMS ((unsigned long objectID)); + +static int +should_dump_extra_data PARAMS ((char *class_name)); + +static void +dump_extra_data PARAMS ((CORE_ADDR addr, unsigned long length)); + +static value_ptr +call_function_by_name PARAMS ((char *function_name, int nargs, ...)); + +static value_ptr +call_function_by_value PARAMS ((value_ptr function_value, int nargs, ...)); + +static value_ptr +vcall_function_by_value PARAMS ((value_ptr function_value, int nargs, + va_list args)); +static void +local_shell_escape PARAMS ((char *arg)); + +static CORE_ADDR +lookup_text_label PARAMS ((char *name, value_ptr *val_ptrptr)); + +static int +is_dispatcher_entry PARAMS ((CORE_ADDR pc)); + +static int +is_dispatcher_exit PARAMS ((CORE_ADDR pc)); + + +/* This is the GDB handler for the "dobj" command, which prints a + verbose description of an object. ARGS is a string containing an + expression for the object ID, and FROM_TTY is nonzero if the + command was issued interactively. */ + +/* ARGSUSED */ +static void +dobj_command (args, from_tty) + char *args; + int from_tty; +{ + if (remote_get_class_name_val == NULL) + error ("This version of Magic Cap lacks the runtime support for \"dobj\"."); + + print_object (args, 1); +} + +/* This is the GDB handler for the "pobj" command, which prints a + brief description of an object. ARGS is a string containing an + expression for the object ID, and FROM_TTY is nonzero if the + command was issued interactively. */ + +/* ARGSUSED */ +static void +pobj_command (args, from_tty) + char *args; + int from_tty; +{ + if (remote_get_class_name_val == NULL) + error ("This version of Magic Cap lacks the runtime support for \"pobj\"."); + + print_object (args, 0); +} + +/* This is the GDB handler for the "cdump" command, which prints a + description of a cluster. ARGS is a string containing a cluster + selector, and FROM_TTY is nonzero if the command was issued + interactively. + + cdump <contextSlot> [/l[ocked]] [/s[tartAddr] <expr>] + [/c[lass] <className> | <classNumber>] */ + +/* ARGSUSED */ +static void +cdump_command (args, from_tty) + char *args; + int from_tty; +{ + char *token; + unsigned long cluster; + CORE_ADDR min_object; + long display_only_locked; + long filter_classes; + long display_only_class_number; + char *display_only_class_name; + + if (args == NULL) + error_no_arg ("expression for context slot to dump"); + + token = strtok (args, " \t"); + if (token[0] == '/') + error ("The first argument to cdump must be an expression for the context slot to dump."); + + cluster = parse_and_eval_address (token); + + /* Initialize option values. Note that we assume that + sizeof (long) == sizeof (void *) here, in that we pass + min_object as a long, even though it is a pointer. */ + + min_object = 0; + display_only_locked = 0; + filter_classes = 0; + display_only_class_name = NULL; + display_only_class_number = 0; + + while ((token = strtok (NULL, " \t")) != NULL) + { + if (token[0] != '/') + goto bad_option; + + switch (token[1]) + { + case 'l': + if (token[2] && strcmp (token + 1, "locked")) + goto bad_option; + + display_only_locked = 1; + break; + + case 's': + if (token[2] && strcmp (token + 1, "startAddr")) + goto bad_option; + + if ((token = strtok (NULL, " \t")) == NULL) + error ("Missing start address expression for `/s' option."); + + min_object = parse_and_eval_address (token); + break; + + case 'c': + if (token[2] && strcmp (token + 1, "class")) + goto bad_option; + + if ((token = strtok (NULL, " \t")) == NULL) + error ("Missing class name or number for `/c' option."); + + filter_classes = 1; + if (isdigit (token[0])) + display_only_class_number = parse_and_eval_address (token); + else + display_only_class_name = token; + + break; + + default: + goto bad_option; + } + } + + if (display_only_class_name != NULL) + error ("Sorry, `/c <className>' isn't supported yet."); + + (void)call_function_by_name ("cdump", 6, cluster, min_object, + display_only_locked, + filter_classes, display_only_class_number, + display_only_class_name); + return; + +bad_option: + error ("Invalid option: `%s'.", token); +} + +/* This is the GDB handler for the "esc" command, which lists the + exception handlers for a given actor. ARGS is a string containing + an expression for the objectID of the actor in question, and FROM_TTY + is nonzero if the command was issued interactively. */ + +/* ARGSUSED */ +static void +esc_command (args, from_tty) + char *args; + int from_tty; +{ + unsigned long object; + + if (args == NULL) + error_no_arg ("expression for actor's object ID"); + + object = parse_and_eval_address (args); + (void)call_function_by_name ("esc", 1, object); +} + +/* This is the GDB handler for the "cnum" command, which converts + a class number to a class name. ARGS is a string containing an + expression for the class number, and FROM_TTY is nonzero if the + command was issued interactively. */ + +/* ARGSUSED */ +static void +cnum_command (args, from_tty) + char *args; + int from_tty; +{ + unsigned long cnum; + + if (args == NULL) + error_no_arg ("expression for class number"); + + cnum = parse_and_eval_address (args); + (void)call_function_by_name ("cnum", 1, cnum); +} + +/* This is the GDB handler for the "getint" command, which converts an + intrinsic operation number to the corresponding intrinsic operation name, + or vice-versa. ARGS is a string containing the intrinsic number or name, + and FROM_TTY is nonzero if the command was issued interactively. */ + +/* ARGSUSED */ +static void +getint_command (args, from_tty) + char *args; + int from_tty; +{ + char shell_command[256]; + + if (args == NULL) + error_no_arg ("intrinsic operation number or name"); + + if (isdigit (args[0])) + sprintf (shell_command, "getint %ld", parse_and_eval_address (args)); + else + sprintf (shell_command, "getint %s", args); + + local_shell_escape (shell_command); +} + +/* This is the GDB handler for the "getop" command, which converts an + operation number to the corresponding operation name, or vice-versa. + ARGS is a string containing the operation number or name, and FROM_TTY + is nonzero if the command was issued interactively. */ + +/* ARGSUSED */ +static void +getop_command (args, from_tty) + char *args; + int from_tty; +{ + char shell_command[256]; + CORE_ADDR op_number; + + if (args == NULL) + error_no_arg ("operation number or name"); + + if (isdigit (args[0])) + sprintf (shell_command, "getop %ld", parse_and_eval_address (args)); + else + sprintf (shell_command, "getop %s", args); + + local_shell_escape (shell_command); +} + +/* This is the GDB handler for the "getindexical" command, which converts + an indexical number to the corresponding indexical name, or vice-versa. + ARGS is a string containing the indexical number or name, and FROM_TTY + is nonzero if the command was issued interactively. */ + +/* ARGSUSED */ +static void +getindexical_command (args, from_tty) + char *args; + int from_tty; +{ + char shell_command[256]; + + if (args == NULL) + error_no_arg ("indexical number or name"); + + if (isdigit (args[0])) + sprintf (shell_command, "getindexical 0x%lx", + parse_and_eval_address (args)); + else + sprintf (shell_command, "getindexical %s", args); + + local_shell_escape (shell_command); +} + +/* This is the GDB handler for the "exc" command, which converts an + exception number to the corresponding exception name, or vice-versa. + ARGS is a string containing the exception number or name, and FROM_TTY + is nonzero if the command was issued interactively. + + FIXME why is this one "exc" instead of "getexc?" (inconsistent naming). */ + +/* ARGSUSED */ +static void +exc_command (args, from_tty) + char *args; + int from_tty; +{ + char shell_command[256]; + + if (args == NULL) + error_no_arg ("exception number or name"); + + if (isdigit (args[0])) + sprintf (shell_command, "getexc %ld", parse_and_eval_address (args)); + else + sprintf (shell_command, "getexc %s", args); + + local_shell_escape (shell_command); +} + +#ifdef DYNAMIC_COMMAND_SUPPORT +/* Open a dynamic library and invoke an entry point within it. + ARGS is a string containing the names of the dynamic library + and the symbolic entry point, separated by whitespace. */ + +/* ARGSUSED */ +static void +dlopen_command (args, from_tty) + char *args; + int from_tty; +{ + char *p; + void *hdl; + void (*sym)(); + + if (args == 0) + { + error ("No arguments specified."); + return; + } + + p = args; + while (*p != ' ' && *p != '\0') + p++; + + if (*p != ' ') + { + error ("Not enough arguments."); + return; + } + *p++ = '\0'; + + hdl = dlopen (args, RTLD_NOW); + if (hdl == NULL) + { + fprintf (stderr, "%s: %s\n", args, dlerror ()); + return; + } + + sym = dlsym (hdl, p); + if (sym == NULL) + { + fprintf (stderr, "%s: %s\n", p, dlerror ()); + return; + } + + sym(); +} +#endif /* DYNAMIC_COMMAND_SUPPORT */ + +/* Given an object ID OBJECT, return a pointer to a type structure + representing the GDB type that describes the layout of the object's + fields in memory (i.e., the "_AllFields" structure corresponding + to the object's class). */ + +struct type * +type_of_object (object) + CORE_ADDR object; +{ + char *class_name = NULL; + char classAllFieldsName[128]; + struct type *type = NULL; + int is_scripted; + + get_class_name (object, &class_name, &is_scripted); + sprintf (classAllFieldsName, "%s_AllFields", class_name); + free (class_name); + + type = lookup_typename (classAllFieldsName, (struct block *)NULL, 0); + return lookup_pointer_type (type); +} + +/* Given OBJECT, an object ID, return the address of the object's + fixed fields. */ + +CORE_ADDR +baseptr_of_object (object) + unsigned long object; +{ + return get_base_ptr (object) + kSizeOfObjectHeader; +} + +/* Given an expression for an object ID, ARGS, print information about + the object--including its class, the values of its fixed fields, and + the values in its extra data block. */ + +/* ARGSUSED */ +static void +print_object (args, dump) + char *args; + int dump; +{ + CORE_ADDR addr; + unsigned long object, object_length; + char *class_name = NULL; + char class_all_fields_name[128]; + struct type *type; + int is_scripted; + struct cleanup *old_chain; + + if (args == NULL) + error_no_arg ("expression for object ID"); + + object = parse_and_eval_address (args); + + /* check for nilObject */ + + if (!object) + { + printf_filtered ("\"%s\" evaluates to nilObject.\n", args); + return; + } + + /* allow shortcut for system object ids */ + + if (IsObjectID (object)) + object |= 1 << kIDBitUsable; + else if (object < 0x5000) + object |= (1 << kIDBitObject) | (1 << kIDBitUsable); /* 0x84000000 */ + + /* Get the name of the object's class, as well as the GDB type that + describes the layout of the object's fixed fields. */ + + get_class_name (object, &class_name, &is_scripted); + old_chain = make_cleanup (free_current_contents, &class_name); + + sprintf (class_all_fields_name, "%s_AllFields", class_name); + type = lookup_typename (class_all_fields_name, (struct block *)NULL, 1); + + /* Get pointer to object's fields. + FIXME: ADDR is actually an (ObjectHeader *); should use normal expression + evaluator to extract the length member, rather than hardwiring the + format of the structure in this code. */ + + addr = get_base_ptr (object); + object_length = read_memory_unsigned_integer (addr, 4); + object_length -= kSizeOfObjectHeader; + addr += kSizeOfObjectHeader; + + if (type == NULL || (TYPE_CODE (type) != TYPE_CODE_UNDEF + && !(TYPE_FLAGS (type) & TYPE_FLAG_STUB))) + { + if (dump) + { + unsigned long fixed_length; + + printf_filtered ("Object 0x%08lx%s at address 0x%08lx of class %s\n", + object, (is_scripted) ? " (scripted)" : "", + addr, class_name); + + /* If the object has fixed fields, dump them. */ + + if (type != NULL) + { + value_ptr valptr = value_at_lazy (type, addr); + int histindex = record_latest_value (valptr); + + if (histindex >= 0) + printf_filtered ("$%d = ", histindex); + + value_print (valptr, gdb_stdout, 0, Val_prettyprint); + puts_filtered ("\n"); + fixed_length = TYPE_LENGTH (type); + } + else + fixed_length = 0; + + /* If the object's length is less than that of its fixed fields, + warn the user. */ + + if (object_length < fixed_length) + { + error ("Warning: object is too small (should be at least %d bytes, is %d bytes).", + fixed_length, object_length); + } + + /* Dump the object's extra data, if any. should_dump_extra_data () + filters out classes (e.g. Cluster) that have too much extra data + to be dumped usefully in this format. */ + + if (should_dump_extra_data (class_name)) + { + dump_extra_data (addr + fixed_length, + object_length - fixed_length); + } + } + else + { + struct type *pointer_type; + value_ptr valptr; + int histindex; + + pointer_type = lookup_pointer_type ((type == NULL) ? + builtin_type_void : type); + valptr = value_from_longest (pointer_type, addr); + + histindex = record_latest_value (valptr); + if (histindex >= 0) + printf_filtered ("$%d = ", histindex); + + value_print (valptr, gdb_stdout, 0, Val_prettyprint); + puts_filtered ("\n"); + } + } + do_cleanups (old_chain); +} + +/* Get the name of the class of the object referenced by OBJECTID. + *NAME is set to a pointer to the string containing the class + name; it is the caller's responsibility to free the memory for + the string. *IS_SCRIPTED is set to nonzero if the object is + scripted, zero otherwise. */ + +static void +get_class_name (objectID, name, is_scripted) + unsigned long objectID; + char **name; + int *is_scripted; +{ + value_ptr val; + int errno_val; + + val = call_function_by_value (remote_get_class_name_val, 1, objectID); + + /* As RemoteGetClassName() is currently (9/21/95) written, an empty string, + rather than a nil pointer, is returned upon failure. I'm leaving the + value_logical_not test in anyway, though, just for added robustness. */ + + if (!value_logical_not (val)) + { + (void)target_read_string (value_as_pointer (val), name, 256, &errno_val); + if (errno_val) + error ("Can't read class name for object 0x%08lx.", objectID); + + if (**name) + { + char *scripted_suffix; + + if ((scripted_suffix = strstr (*name, " (scripted)")) != NULL) + { + *scripted_suffix = '\0'; + *is_scripted = 1; + } + else + *is_scripted = 0; + + return; + } + else + free (*name); + } + + error ("Bad object ID: 0x%08lx.", objectID); +} + +/* Given an object ID, return a pointer to the object's data. */ + +static CORE_ADDR +get_base_ptr (objectID) + unsigned long objectID; +{ + register value_ptr val; + + val = call_function_by_value (remote_get_base_ptr_val, 1, objectID); + + if (value_logical_not (val)) + error ("Could not get base pointer to object."); + + return value_as_pointer (val); +} + +/* Return nonzero if we should dump the extra data for an object + of class CLASS_NAME. + + FIXME this only works for explicitly named classes, and doesn't + handle subclasses. */ + +static int +should_dump_extra_data (class_name) + char *class_name; +{ + int i; + char **name; + static char *dont_dump_extra_classes[] = + { + "Cluster" + }; + + for (i = 0, name = dont_dump_extra_classes; + i < ARRAY_NELEMENTS(dont_dump_extra_classes); + i++, name++) + { + if (!strcmp (class_name, *name)) + return 0; + } + + return 1; +} + +/* Given ADDR, the address of an object's extra data block, and LENGTH, + the length of that block in bytes, dump the object's extra data to + standard output. */ + +static void +dump_extra_data (addr, length) + CORE_ADDR addr; + unsigned long length; +{ + unsigned long buf[5]; + int chunk; + int chunk_longs; + int i; + int bytes_printed; + char *p; + + bytes_printed = 0; + + while (length > 3 && bytes_printed < extra_data_max) + { + QUIT; /* allow user to interrupt dump */ + + /* read a chunk of extra data */ + + chunk = (length > 16) ? 16 : length; + memset (buf, 0, sizeof (buf)); + read_memory (addr, (char *) &buf, chunk); + + /* format data as hex longwords */ + + chunk_longs = chunk >> 2; + for (i = 0; i < chunk_longs; i++) + printf_filtered ("%08lx ", + extract_unsigned_integer (buf + i, sizeof (long))); + + /* pad to 4 longs */ + + for (i = chunk_longs; i < 4; i++) + puts_filtered (" "); + + puts_filtered ("| "); + + /* format data as ascii bytes */ + + for (i = 0, p = (char*)buf; i < chunk; i++, p++) + { + if (!isprint (*p)) + *p = '.'; + } + printf_filtered ("%s |\n", buf); + + addr += chunk; + length -= chunk; + bytes_printed += chunk; + } + + if (length > 0) + printf_filtered ("(%d bytes of extra data remaining but not displayed.)\n", + length); +} + +/* Given the name of a function in the target program and a list of + long arguments, call the function and return a pointer to a value + object describing the function's return value. NAME is a string + containing the name of the function to be called; NARGS is the + number of arguments to the function; and the remaining parameters + are the arguments to passed to the function, all assumed to be of + type long. */ + +static value_ptr +#ifdef ANSI_PROTOTYPES +call_function_by_name (char *function_name, int nargs, ...) +#else +call_function_by_name (va_alist) + va_dcl +#endif +{ + va_list args; + value_ptr return_value; + value_ptr function_value; +#ifndef ANSI_PROTOTYPES + char *function_name; + int nargs; + + va_start (args); + function_name = va_arg (args, char *); + nargs = va_arg (args, int); +#else + va_start (args, nargs); +#endif + + /* Find the address of function NAME in the inferior. */ + + if (!lookup_text_label (function_name, &function_value)) + error ("Execution of this command requires the debugged program to have a function \"%s.\"", + function_name); + + /* Call the function. */ + + return_value = vcall_function_by_value (function_value, nargs, args); + va_end (args); + + return return_value; +} + +/* Given a value object describing a function in the target program and + a list of long arguments, call the function and return a pointer to a + value object describing the function's return value. FUNCTION_VALUE + is a pointer to a value struct describing the function; NARGS is the + number of arguments to the function; and the remaining parameters are + the arguments to passed to the function, all assumed to be of type long. */ + +static value_ptr +#ifdef ANSI_PROTOTYPES +call_function_by_value (value_ptr function_value, int nargs, ...) +#else +call_function_by_value (va_alist) + va_dcl +#endif +{ + va_list args; + value_ptr return_value; +#ifndef ANSI_PROTOTYPES + value_ptr function_value; + int nargs; + + va_start (args); + function_value = va_arg (args, value_ptr); + nargs = va_arg (args, int); +#else + va_start (args, nargs); +#endif + + /* Call the function and return its return value. */ + + return_value = vcall_function_by_value (function_value, nargs, args); + va_end (args); + + return return_value; +} + +/* Helper routine for call_function_by_name and call_function_by_value + above. This function does the work of collecting the function + arguments into an array of value objects, and then invoking + call_function_by_hand to do the real work. FUNCTION_VALUE is a + pointer to a value object describing the function to be called, + NARGS is the number of arguments to the function, and ARGS is a + list (va_list) of the arguments to the function, all assumed to + be of type long. + + Returns a pointer to a value object describing the return value + of the function. */ + +static value_ptr +vcall_function_by_value (function_value, nargs, args) + value_ptr function_value; + int nargs; + va_list args; +{ + value_ptr *arg_values; + value_ptr return_value; + struct cleanup *old_chain; + int i; + + /* Construct a vector of value objects describing the arguments + to the function to be called. */ + + arg_values = (value_ptr *) xmalloc (nargs * sizeof (value_ptr)); + old_chain = make_cleanup (free_current_contents, &arg_values); + + for (i = 0; i < nargs; i++) + arg_values[i] = value_from_longest (builtin_type_long, + (LONGEST) va_arg (args, unsigned long)); + + /* Call the function and return its return value. */ + + return_value = call_function_by_hand (function_value, nargs, arg_values); + do_cleanups (old_chain); + return return_value; +} + +/* Invoke a shell, supplying ARG as the command to be executed. */ + +static void +local_shell_escape (arg) + char *arg; +{ +#ifdef CANT_FORK + /* FIXME: what about errors (I don't know how GO32 system() handles + them)? */ + system (arg); +#else /* Can fork. */ + int rc, status, pid; + char *p, *user_shell; + + if ((user_shell = (char *) getenv ("SHELL")) == NULL) + user_shell = "/bin/sh"; + + /* Get the name of the shell for arg0 */ + if ((p = strrchr (user_shell, '/')) == NULL) + p = user_shell; + else + p++; /* Get past '/' */ + + if ((pid = fork()) == 0) + { + if (!arg) + execl (user_shell, p, 0); + else + execl (user_shell, p, "-c", arg, 0); + + fprintf_unfiltered (gdb_stderr, "Cannot execute %s: %s\n", user_shell, + safe_strerror (errno)); + gdb_flush (gdb_stderr); + _exit (0177); + } + + if (pid != -1) + while ((rc = wait (&status)) != pid && rc != -1) + ; + else + error ("Fork failed"); +#endif /* Can fork. */ +} + +/* Lookup NAME as a text label in the target program. If NAME is the + name of a function, and VAL_PTRPTR is not NULL, a pointer to a value + object describing the function is stored at VAL_PTRPTR. + + Returns the text address to which the label refers, or 0 if the + label is not found in the target program. */ + +static CORE_ADDR +lookup_text_label (name, val_ptrptr) + char *name; + value_ptr *val_ptrptr; +{ + struct symbol *sym; + CORE_ADDR addr; + + addr = 0; + + /* Try looking up NAME as a first-class symbol. */ + + sym = lookup_symbol (name, 0, VAR_NAMESPACE, 0, NULL); + if (sym != NULL) + { + switch (SYMBOL_CLASS (sym)) + { + case LOC_BLOCK: + addr = BLOCK_START (SYMBOL_BLOCK_VALUE (sym)); + if (val_ptrptr != NULL) + *val_ptrptr = value_of_variable (sym, NULL); + + break; + + case LOC_STATIC: + case LOC_LABEL: + addr = SYMBOL_VALUE_ADDRESS (sym); + break; + } + } + else + { + struct minimal_symbol *msymbol; + struct type *type; + + /* Try to find a minimal symbol for NAME. */ + + msymbol = lookup_minimal_symbol (name, "", (struct objfile *) NULL); + if (msymbol != NULL) + { + addr = SYMBOL_VALUE_ADDRESS (msymbol); + if (val_ptrptr != NULL) + { + type = lookup_pointer_type (builtin_type_char); + type = lookup_function_type (type); + type = lookup_pointer_type (type); + *val_ptrptr = value_from_longest (type, addr); + } + } + } + return addr; +} + +/* The following two routines adapt GDB's framework for stepping over + shared library trampoline code to the problem of stepping over the + Magic Cap method dispatcher. While the method dispatcher is not a + shared library trampoline, we can use the interfaces for controlling + stepping over trampolines to do what we want. */ + +/* Return nonzero if STOP_PC is within the Magic Cap method dispatcher. + NAME is unused. This function serves as the implementation of both + IN_SOLIB_CALL_TRAMPOLINE() and IN_SOLIB_RETURN_TRAMPOLINE() when GDB + is configured to target Magic Cap. We don't need to distinguish + between the two types of trampolines (because they're not really + trampolines); we just need to tell GDB to set a breakpoint at the + site of the next "hop" on our way through the dispatcher, and to + keep going. */ + +int +magic_in_dispatcher (stop_pc, name) + CORE_ADDR stop_pc; + char *name; +{ + return magic_step_enabled + && (is_dispatcher_entry (stop_pc) || is_dispatcher_exit (stop_pc)); +} + +/* Determine if STOP_PC is an address within the Magic Cap method + dispatcher, and if so, return the address at which GDB should set + a step resume breakpoint in order to skip over the dispatcher code. + In fact, we have to skip over the dispatcher in two separate "hops:" + the first hop gets us from a dispatcher entry point to the dispatcher + exit site; the second hop gets us from this exit site to the first + instruction of the method. + + This function serves as the implementation of SKIP_TRAMPOLINE_CODE() + when GDB is configured to target Magic Cap. */ + +CORE_ADDR +magic_skip_dispatcher (stop_pc) + CORE_ADDR stop_pc; +{ + /* If magic stepping is disabled, return 0, indicating that GDB should + process this step event normally. This will have the effect of + allowing the user to step through the dispatcher code itself. */ + + if (!magic_step_enabled) + return 0; + + /* If the program is stopped at an entry point to the dispatcher, + tell GDB to set a breakpoint at a well-known label in the + dispatcher where we will be able to determine the address of + the method to which we are dispatching. Note that the dispatcher + has hair to ensure that the code at this label is executed when we + are completing a top-level dispatch; recursive dispatches generated + from within the dispatcher do not exit through this code. */ + + if (is_dispatcher_entry (stop_pc)) + return DO_DISPATCH_METHOD_ADDR; + + /* If we have hit the breakpoint set previously at a dispatcher exit site, + determine the method address and tell GDB to set a breakpoint there. */ + + else if (is_dispatcher_exit (stop_pc)) + return read_register (14); /* assumes that we branch through t6 */ + else + return 0; +} + +/* Return nonzero if PC is an entry point to the Magic Cap method + dispatcher. */ + +static int +is_dispatcher_entry (pc) + CORE_ADDR pc; +{ + return pc == DISPATCH_METHOD_ADDR + || pc == DISPATCH_INTRINSIC_ADDR + || pc == DISPATCH_INHERITED_ADDR + || pc == DISPATCH_DELEGATED_ADDR; +} + +/* Return nonzero if PC is an exit site from the Magic Cap method + dispatcher. */ + +static int +is_dispatcher_exit (pc) + CORE_ADDR pc; +{ + return pc == DO_DISPATCH_METHOD_ADDR; +} + +/* Store away addresses in the inferior we need to control single-stepping + through Magic Cap method dispatches, as well as other addresses of + interest in Magic Cap. */ + +void +init_magic () +{ + struct text_label *label; + int i; + + /* Cache method dispatch label addresses. */ + + for (i = 0, label = dispatch_labels; + i < ARRAY_NELEMENTS (dispatch_labels); + i++, label++) + { + if (!(label->addr = lookup_text_label (label->name, NULL))) + { + /* If we can't find all of the dispatcher addresses, don't attempt + to do magic stepping. */ + + magic_step_enabled = 0; + break; + } + } + + /* Cache value objects for RemoteGetClassName () and RemoteGetBasePtr (), + which are used to implement the "dobj" and "pobj" commands. Note that + we must call release_value () on these values to prevent GDB from freeing + them automatically. */ + + if (remote_get_class_name_val != NULL) + { + value_free (remote_get_class_name_val); + remote_get_class_name_val = NULL; + } + + if (remote_get_base_ptr_val != NULL) + { + value_free (remote_get_base_ptr_val); + remote_get_base_ptr_val = NULL; + } + + if (lookup_text_label ("RemoteGetClassName", &remote_get_class_name_val)) + { + release_value (remote_get_class_name_val); + + if (lookup_text_label ("RemoteGetBasePtr", &remote_get_base_ptr_val)) + release_value (remote_get_base_ptr_val); + } +} + +/* Hook routine called when an inferior (i.e., debugged) process is + created. */ + +void +magic_create_inferior_hook () +{ + struct symbol *sym = lookup_symbol ("gHandleError", NULL, VAR_NAMESPACE, + NULL, NULL); + if (sym) + { + CORE_ADDR addr = SYMBOL_VALUE (sym); + unsigned long errorDebugger = 2; + + target_write_memory (addr, (char *) &errorDebugger, 4); + } +} + +/* Initialization routine for magic.c. This is where we define debugger + commands specific to Magic Cap. */ + +void +_initialize_magic () +{ + add_com ("dobj", class_support, dobj_command, + "Display object contents.\n\ +Usage: dobj <objectID>\n\ +Where: <objectID> is an expression for the object ID to dump."); + + add_com ("pobj", class_support, pobj_command, + "Print object base pointer.\n\ +Usage: pobj <objectID>\n\ +Where: <objectID> is an expression for the object ID to examine."); + + add_com ("cdump", class_support, cdump_command, + concat ("Display the contents of a cluster.\n\ +Usage: cdump <contextSlot> [/l[ocked]] [/s[tartAddr] <addr>]\n\ + [/c[lass] <classNumber>]\n\ +Where: <contextSlot> is an expression describing the cluster to dump;\n\ + if <contextSlot> is a number between 0x8 and 0xf, it is \n\ + interpreted as the high-order nibble of an object ID\n\ + belonging to the cluster to dump, with the second highest-\n\ + order nibble assumed to be 0. (For example, \"cdump 8\" and \n\ + \"cdump 0xa\" dump the System Persistent and Persistent RAM\n\ + clusters, respectively.)\n", + "\n\ + if <contextSlot> is a number between 0xf0 and 0x100, it is\n\ + interpreted as the high-order byte of an object ID belonging to\n\ + the cluster to dump. (For example, \"cdump 0x88\" and \n\ + \"cdump 0xa8\" dump the Locked Persistent and Transient RAM\n\ + clusters, respectively.)\n", + "\n\ + /locked or /l indicates that only locked objects are to be displayed.\n\ +\n\ + /startAddr or /s indicates that only objects whose base pointers are\n\ + greater than or equal to the address specified by the following\n\ + expression (<startAddr>) are to be displayed.\n\ +\n\ + /class or /c indicates that only objects of the class specified by\n\ + the following expression <classNumber> are to be displayed.", + NULL)); + + add_com ("esc", class_support, esc_command, + "List all the exception handlers for a given actor.\n\ +Usage: esc <objectID>\n\ +Where: <objectID> is an expression for the object ID of the actor\n\ + whose exception handlers are to be listed."); + + add_com ("cnum", class_support, cnum_command, + "Convert class number to name.\n\ +Usage: cnum <classNumber>\n\ +Where: <classNumber> is an expression for the class number to convert."); + + add_com ("getint", class_support, getint_command, + "Convert intrinsic name to number or vice versa.\n\ +Usage: getint <intrinsicName> | <intrinsicNumber>\n\ +Where: <intrinsicName> | <intrinsicNumber> is an intrinsic operation name\n\ + to be converted to an operation number, or an intrinsic operation\n\ + number to be converted to an operation name."); + + add_com ("getop", class_support, getop_command, + "Convert operation name to number or vice versa.\n\ +Usage: getop <operationName> | <operationNumber>\n\ +Where: <operationName> | <operationNumber> is an operation name to be\n\ + converted to an operation number, or an operation number to\n\ + be converted to an operation name."); + + add_com ("getindexical", class_support, getindexical_command, + "Convert indexical name to number or vice versa.\n\ +Usage: getindexical <indexicalName> | <indexicalNumber>\n\ +Where: <indexicalName> | <indexicalNumber> is an indexical name to be\n\ + converted to an an indexical number, or an indexical number\n\ + to be converted to an indexical name."); + + add_com ("exc", class_support, exc_command, + "Convert exception name to number or vice versa.\n\ +Usage: exc <exceptionName> | <exceptionNumber>\n\ +Where: <exceptionName> | <exceptionNumber> is an exception name to be\n\ + converted to an an exception number, or an exception number\n\ + to be converted to an exception name."); + + add_show_from_set + (add_set_cmd ("extra-data-max", class_support, var_uinteger, + (char *) &extra_data_max, + "Set limit on number of bytes of extra data to print.\n\ +This command sets an upper limit on the number of bytes of extra\n\ +data displayed by the \"dobj\" command when dumping a Magic Cap\n\ +object. \"set extra-data-max 0\" causes there to be no limit.", + &setlist), + &showlist); + + extra_data_max = EXTRA_DATA_MAX_DEFAULT; + + add_show_from_set + (add_set_cmd ("magic-step", class_support, var_boolean, + (char *) &magic_step_enabled, + "Set stepping over Magic Cap method dispatches.\n\ +When set to \"on\" (the default), issuing a \"step\" command at a Magic Cap\n\ +operation call site will cause the program to stop at the first line of\n\ +the corresponding method. Set this to \"off\" only if you need to debug\n\ +the dispatcher itself.", + &setlist), + &showlist); + + magic_step_enabled = 1; + +#ifdef DYNAMIC_COMMAND_SUPPORT + add_com ("dlopen", class_support, dlopen_command, + "Load the dynamic library specified and execute the specified symbol"); +#endif +} |