/* Handle JIT code generation in the inferior for GDB, the GNU Debugger.
- Copyright (C) 2009, 2010, 2011 Free Software Foundation, Inc.
+ Copyright (C) 2009-2012 Free Software Foundation, Inc.
This file is part of GDB.
#include "defs.h"
#include "jit.h"
+#include "jit-reader.h"
+#include "block.h"
#include "breakpoint.h"
#include "command.h"
+#include "dictionary.h"
+#include "frame-unwind.h"
#include "gdbcmd.h"
#include "gdbcore.h"
#include "inferior.h"
#include "observer.h"
#include "objfiles.h"
+#include "regcache.h"
#include "symfile.h"
#include "symtab.h"
#include "target.h"
+#include "gdb-dlfcn.h"
#include "gdb_stat.h"
+#include "exceptions.h"
+
+static const char *jit_reader_dir = NULL;
static const struct objfile_data *jit_objfile_data;
static void jit_inferior_init (struct gdbarch *gdbarch);
+/* An unwinder is registered for every gdbarch. This key is used to
+ remember if the unwinder has been registered for a particular
+ gdbarch. */
+
+static struct gdbarch_data *jit_gdbarch_data;
+
/* Non-zero if we want to see trace of jit level stuff. */
static int jit_debug = 0;
mem_bfd_iovec_stat);
}
-/* Per-inferior structure recording the addresses in the inferior. */
+/* One reader that has been loaded successfully, and can potentially be used to
+ parse debug info. */
+
+static struct jit_reader
+{
+ struct gdb_reader_funcs *functions;
+ void *handle;
+} *loaded_jit_reader = NULL;
+
+typedef struct gdb_reader_funcs * (reader_init_fn_type) (void);
+static const char *reader_init_fn_sym = "gdb_init_reader";
+
+/* Try to load FILE_NAME as a JIT debug info reader. */
+
+static struct jit_reader *
+jit_reader_load (const char *file_name)
+{
+ void *so;
+ reader_init_fn_type *init_fn;
+ struct jit_reader *new_reader = NULL;
+ struct gdb_reader_funcs *funcs = NULL;
+ struct cleanup *old_cleanups;
+
+ if (jit_debug)
+ fprintf_unfiltered (gdb_stdlog, _("Opening shared object %s.\n"),
+ file_name);
+ so = gdb_dlopen (file_name);
+ old_cleanups = make_cleanup_dlclose (so);
+
+ init_fn = gdb_dlsym (so, reader_init_fn_sym);
+ if (!init_fn)
+ error (_("Could not locate initialization function: %s."),
+ reader_init_fn_sym);
+
+ if (gdb_dlsym (so, "plugin_is_GPL_compatible") == NULL)
+ error (_("Reader not GPL compatible."));
+
+ funcs = init_fn ();
+ if (funcs->reader_version != GDB_READER_INTERFACE_VERSION)
+ error (_("Reader version does not match GDB version."));
+
+ new_reader = XZALLOC (struct jit_reader);
+ new_reader->functions = funcs;
+ new_reader->handle = so;
+
+ discard_cleanups (old_cleanups);
+ return new_reader;
+}
+
+/* Provides the jit-reader-load command. */
+
+static void
+jit_reader_load_command (char *args, int from_tty)
+{
+ char *so_name;
+ struct cleanup *prev_cleanup;
+
+ if (args == NULL)
+ error (_("No reader name provided."));
+
+ if (loaded_jit_reader != NULL)
+ error (_("JIT reader already loaded. Run jit-reader-unload first."));
+
+ so_name = xstrprintf ("%s/%s", jit_reader_dir, args);
+ prev_cleanup = make_cleanup (xfree, so_name);
+
+ loaded_jit_reader = jit_reader_load (so_name);
+ do_cleanups (prev_cleanup);
+}
+
+/* Provides the jit-reader-unload command. */
+
+static void
+jit_reader_unload_command (char *args, int from_tty)
+{
+ if (!loaded_jit_reader)
+ error (_("No JIT reader loaded."));
+
+ loaded_jit_reader->functions->destroy (loaded_jit_reader->functions);
+
+ gdb_dlclose (loaded_jit_reader->handle);
+ xfree (loaded_jit_reader);
+ loaded_jit_reader = NULL;
+}
+
+/* Per-inferior structure recording which objfile has the JIT
+ symbols. */
struct jit_inferior_data
{
- CORE_ADDR breakpoint_addr; /* &__jit_debug_register_code() */
- CORE_ADDR descriptor_addr; /* &__jit_debug_descriptor */
+ /* The objfile. This is NULL if no objfile holds the JIT
+ symbols. */
+
+ struct objfile *objfile;
+};
+
+/* Per-objfile structure recording the addresses in the inferior. */
+
+struct jit_objfile_data
+{
+ /* Symbol for __jit_debug_register_code. */
+ struct minimal_symbol *register_code;
+
+ /* Symbol for __jit_debug_descriptor. */
+ struct minimal_symbol *descriptor;
+
+ /* Address of struct jit_code_entry in this objfile. */
+ CORE_ADDR addr;
};
+/* Fetch the jit_objfile_data associated with OBJF. If no data exists
+ yet, make a new structure and attach it. */
+
+static struct jit_objfile_data *
+get_jit_objfile_data (struct objfile *objf)
+{
+ struct jit_objfile_data *objf_data;
+
+ objf_data = objfile_data (objf, jit_objfile_data);
+ if (objf_data == NULL)
+ {
+ objf_data = XZALLOC (struct jit_objfile_data);
+ set_objfile_data (objf, jit_objfile_data, objf_data);
+ }
+
+ return objf_data;
+}
+
+/* Remember OBJFILE has been created for struct jit_code_entry located
+ at inferior address ENTRY. */
+
+static void
+add_objfile_entry (struct objfile *objfile, CORE_ADDR entry)
+{
+ struct jit_objfile_data *objf_data;
+
+ objf_data = get_jit_objfile_data (objfile);
+ objf_data->addr = entry;
+}
+
/* Return jit_inferior_data for current inferior. Allocate if not already
present. */
}
/* Helper function for reading the global JIT descriptor from remote
- memory. */
+ memory. Returns 1 if all went well, 0 otherwise. */
-static void
+static int
jit_read_descriptor (struct gdbarch *gdbarch,
struct jit_descriptor *descriptor,
- CORE_ADDR descriptor_addr)
+ struct jit_inferior_data *inf_data)
{
int err;
struct type *ptr_type;
int desc_size;
gdb_byte *desc_buf;
enum bfd_endian byte_order = gdbarch_byte_order (gdbarch);
+ struct jit_objfile_data *objf_data;
+
+ if (inf_data->objfile == NULL)
+ return 0;
+ objf_data = get_jit_objfile_data (inf_data->objfile);
+ if (objf_data->descriptor == NULL)
+ return 0;
+
+ if (jit_debug)
+ fprintf_unfiltered (gdb_stdlog,
+ "jit_read_descriptor, descriptor_addr = %s\n",
+ paddress (gdbarch, SYMBOL_VALUE_ADDRESS (objf_data->descriptor)));
/* Figure out how big the descriptor is on the remote and how to read it. */
ptr_type = builtin_type (gdbarch)->builtin_data_ptr;
desc_buf = alloca (desc_size);
/* Read the descriptor. */
- err = target_read_memory (descriptor_addr, desc_buf, desc_size);
+ err = target_read_memory (SYMBOL_VALUE_ADDRESS (objf_data->descriptor),
+ desc_buf, desc_size);
if (err)
- error (_("Unable to read JIT descriptor from remote memory!"));
+ {
+ printf_unfiltered (_("Unable to read JIT descriptor from "
+ "remote memory\n"));
+ return 0;
+ }
/* Fix the endianness to match the host. */
descriptor->version = extract_unsigned_integer (&desc_buf[0], 4, byte_order);
descriptor->relevant_entry = extract_typed_address (&desc_buf[8], ptr_type);
descriptor->first_entry =
extract_typed_address (&desc_buf[8 + ptr_size], ptr_type);
+
+ return 1;
}
/* Helper function for reading a JITed code entry from remote memory. */
/* Figure out how big the entry is on the remote and how to read it. */
ptr_type = builtin_type (gdbarch)->builtin_data_ptr;
ptr_size = TYPE_LENGTH (ptr_type);
- entry_size = 3 * ptr_size + 8; /* Three pointers and one 64-bit int. */
+
+ /* Figure out where the longlong value will be. */
+ align_bytes = gdbarch_long_long_align_bit (gdbarch) / 8;
+ off = 3 * ptr_size;
+ off = (off + (align_bytes - 1)) & ~(align_bytes - 1);
+
+ entry_size = off + 8; /* Three pointers and one 64-bit int. */
entry_buf = alloca (entry_size);
/* Read the entry. */
extract_typed_address (&entry_buf[ptr_size], ptr_type);
code_entry->symfile_addr =
extract_typed_address (&entry_buf[2 * ptr_size], ptr_type);
-
- align_bytes = gdbarch_long_long_align_bit (gdbarch) / 8;
- off = 3 * ptr_size;
- off = (off + (align_bytes - 1)) & ~(align_bytes - 1);
-
code_entry->symfile_size =
extract_unsigned_integer (&entry_buf[off], 8, byte_order);
}
-/* This function registers code associated with a JIT code entry. It uses the
- pointer and size pair in the entry to read the symbol file from the remote
- and then calls symbol_file_add_from_local_memory to add it as though it were
- a symbol file added by the user. */
+/* Proxy object for building a block. */
+
+struct gdb_block
+{
+ /* gdb_blocks are linked into a tree structure. Next points to the
+ next node at the same depth as this block and parent to the
+ parent gdb_block. */
+ struct gdb_block *next, *parent;
+
+ /* Points to the "real" block that is being built out of this
+ instance. This block will be added to a blockvector, which will
+ then be added to a symtab. */
+ struct block *real_block;
+
+ /* The first and last code address corresponding to this block. */
+ CORE_ADDR begin, end;
+
+ /* The name of this block (if any). If this is non-NULL, the
+ FUNCTION symbol symbol is set to this value. */
+ const char *name;
+};
+
+/* Proxy object for building a symtab. */
+
+struct gdb_symtab
+{
+ /* The list of blocks in this symtab. These will eventually be
+ converted to real blocks. */
+ struct gdb_block *blocks;
+
+ /* The number of blocks inserted. */
+ int nblocks;
+
+ /* A mapping between line numbers to PC. */
+ struct linetable *linetable;
+
+ /* The source file for this symtab. */
+ const char *file_name;
+ struct gdb_symtab *next;
+};
+
+/* Proxy object for building an object. */
+
+struct gdb_object
+{
+ struct gdb_symtab *symtabs;
+};
+
+/* The type of the `private' data passed around by the callback
+ functions. */
+
+typedef CORE_ADDR jit_dbg_reader_data;
+
+/* The reader calls into this function to read data off the targets
+ address space. */
+
+static enum gdb_status
+jit_target_read_impl (GDB_CORE_ADDR target_mem, void *gdb_buf, int len)
+{
+ int result = target_read_memory ((CORE_ADDR) target_mem, gdb_buf, len);
+ if (result == 0)
+ return GDB_SUCCESS;
+ else
+ return GDB_FAIL;
+}
+
+/* The reader calls into this function to create a new gdb_object
+ which it can then pass around to the other callbacks. Right now,
+ all that is required is allocating the memory. */
+
+static struct gdb_object *
+jit_object_open_impl (struct gdb_symbol_callbacks *cb)
+{
+ /* CB is not required right now, but sometime in the future we might
+ need a handle to it, and we'd like to do that without breaking
+ the ABI. */
+ return XZALLOC (struct gdb_object);
+}
+
+/* Readers call into this function to open a new gdb_symtab, which,
+ again, is passed around to other callbacks. */
+
+static struct gdb_symtab *
+jit_symtab_open_impl (struct gdb_symbol_callbacks *cb,
+ struct gdb_object *object,
+ const char *file_name)
+{
+ struct gdb_symtab *ret;
+
+ /* CB stays unused. See comment in jit_object_open_impl. */
+
+ ret = XZALLOC (struct gdb_symtab);
+ ret->file_name = file_name ? xstrdup (file_name) : xstrdup ("");
+ ret->next = object->symtabs;
+ object->symtabs = ret;
+ return ret;
+}
+
+/* Returns true if the block corresponding to old should be placed
+ before the block corresponding to new in the final blockvector. */
+
+static int
+compare_block (const struct gdb_block *const old,
+ const struct gdb_block *const new)
+{
+ if (old == NULL)
+ return 1;
+ if (old->begin < new->begin)
+ return 1;
+ else if (old->begin == new->begin)
+ {
+ if (old->end > new->end)
+ return 1;
+ else
+ return 0;
+ }
+ else
+ return 0;
+}
+
+/* Called by readers to open a new gdb_block. This function also
+ inserts the new gdb_block in the correct place in the corresponding
+ gdb_symtab. */
+
+static struct gdb_block *
+jit_block_open_impl (struct gdb_symbol_callbacks *cb,
+ struct gdb_symtab *symtab, struct gdb_block *parent,
+ GDB_CORE_ADDR begin, GDB_CORE_ADDR end, const char *name)
+{
+ struct gdb_block *block = XZALLOC (struct gdb_block);
+
+ block->next = symtab->blocks;
+ block->begin = (CORE_ADDR) begin;
+ block->end = (CORE_ADDR) end;
+ block->name = name ? xstrdup (name) : NULL;
+ block->parent = parent;
+
+ /* Ensure that the blocks are inserted in the correct (reverse of
+ the order expected by blockvector). */
+ if (compare_block (symtab->blocks, block))
+ {
+ symtab->blocks = block;
+ }
+ else
+ {
+ struct gdb_block *i = symtab->blocks;
+
+ for (;; i = i->next)
+ {
+ /* Guaranteed to terminate, since compare_block (NULL, _)
+ returns 1. */
+ if (compare_block (i->next, block))
+ {
+ block->next = i->next;
+ i->next = block;
+ break;
+ }
+ }
+ }
+ symtab->nblocks++;
+
+ return block;
+}
+
+/* Readers call this to add a line mapping (from PC to line number) to
+ a gdb_symtab. */
static void
-jit_register_code (struct gdbarch *gdbarch,
- CORE_ADDR entry_addr, struct jit_code_entry *code_entry)
+jit_symtab_line_mapping_add_impl (struct gdb_symbol_callbacks *cb,
+ struct gdb_symtab *stab, int nlines,
+ struct gdb_line_mapping *map)
+{
+ int i;
+
+ if (nlines < 1)
+ return;
+
+ stab->linetable = xmalloc (sizeof (struct linetable)
+ + (nlines - 1) * sizeof (struct linetable_entry));
+ stab->linetable->nitems = nlines;
+ for (i = 0; i < nlines; i++)
+ {
+ stab->linetable->item[i].pc = (CORE_ADDR) map[i].pc;
+ stab->linetable->item[i].line = map[i].line;
+ }
+}
+
+/* Called by readers to close a gdb_symtab. Does not need to do
+ anything as of now. */
+
+static void
+jit_symtab_close_impl (struct gdb_symbol_callbacks *cb,
+ struct gdb_symtab *stab)
+{
+ /* Right now nothing needs to be done here. We may need to do some
+ cleanup here in the future (again, without breaking the plugin
+ ABI). */
+}
+
+/* Transform STAB to a proper symtab, and add it it OBJFILE. */
+
+static void
+finalize_symtab (struct gdb_symtab *stab, struct objfile *objfile)
+{
+ struct symtab *symtab;
+ struct gdb_block *gdb_block_iter, *gdb_block_iter_tmp;
+ struct block *block_iter;
+ int actual_nblocks, i, blockvector_size;
+ CORE_ADDR begin, end;
+
+ actual_nblocks = FIRST_LOCAL_BLOCK + stab->nblocks;
+
+ symtab = allocate_symtab (stab->file_name, objfile);
+ /* JIT compilers compile in memory. */
+ symtab->dirname = NULL;
+
+ /* Copy over the linetable entry if one was provided. */
+ if (stab->linetable)
+ {
+ int size = ((stab->linetable->nitems - 1)
+ * sizeof (struct linetable_entry)
+ + sizeof (struct linetable));
+ LINETABLE (symtab) = obstack_alloc (&objfile->objfile_obstack, size);
+ memcpy (LINETABLE (symtab), stab->linetable, size);
+ }
+ else
+ {
+ LINETABLE (symtab) = NULL;
+ }
+
+ blockvector_size = (sizeof (struct blockvector)
+ + (actual_nblocks - 1) * sizeof (struct block *));
+ symtab->blockvector = obstack_alloc (&objfile->objfile_obstack,
+ blockvector_size);
+
+ /* (begin, end) will contain the PC range this entire blockvector
+ spans. */
+ symtab->primary = 1;
+ BLOCKVECTOR_MAP (symtab->blockvector) = NULL;
+ begin = stab->blocks->begin;
+ end = stab->blocks->end;
+ BLOCKVECTOR_NBLOCKS (symtab->blockvector) = actual_nblocks;
+
+ /* First run over all the gdb_block objects, creating a real block
+ object for each. Simultaneously, keep setting the real_block
+ fields. */
+ for (i = (actual_nblocks - 1), gdb_block_iter = stab->blocks;
+ i >= FIRST_LOCAL_BLOCK;
+ i--, gdb_block_iter = gdb_block_iter->next)
+ {
+ struct block *new_block = allocate_block (&objfile->objfile_obstack);
+ struct symbol *block_name = obstack_alloc (&objfile->objfile_obstack,
+ sizeof (struct symbol));
+
+ BLOCK_DICT (new_block) = dict_create_linear (&objfile->objfile_obstack,
+ NULL);
+ /* The address range. */
+ BLOCK_START (new_block) = (CORE_ADDR) gdb_block_iter->begin;
+ BLOCK_END (new_block) = (CORE_ADDR) gdb_block_iter->end;
+
+ /* The name. */
+ memset (block_name, 0, sizeof (struct symbol));
+ SYMBOL_DOMAIN (block_name) = VAR_DOMAIN;
+ SYMBOL_CLASS (block_name) = LOC_BLOCK;
+ SYMBOL_SYMTAB (block_name) = symtab;
+ SYMBOL_BLOCK_VALUE (block_name) = new_block;
+
+ block_name->ginfo.name = obsavestring (gdb_block_iter->name,
+ strlen (gdb_block_iter->name),
+ &objfile->objfile_obstack);
+
+ BLOCK_FUNCTION (new_block) = block_name;
+
+ BLOCKVECTOR_BLOCK (symtab->blockvector, i) = new_block;
+ if (begin > BLOCK_START (new_block))
+ begin = BLOCK_START (new_block);
+ if (end < BLOCK_END (new_block))
+ end = BLOCK_END (new_block);
+
+ gdb_block_iter->real_block = new_block;
+ }
+
+ /* Now add the special blocks. */
+ block_iter = NULL;
+ for (i = 0; i < FIRST_LOCAL_BLOCK; i++)
+ {
+ struct block *new_block;
+
+ new_block = (i == GLOBAL_BLOCK
+ ? allocate_global_block (&objfile->objfile_obstack)
+ : allocate_block (&objfile->objfile_obstack));
+ BLOCK_DICT (new_block) = dict_create_linear (&objfile->objfile_obstack,
+ NULL);
+ BLOCK_SUPERBLOCK (new_block) = block_iter;
+ block_iter = new_block;
+
+ BLOCK_START (new_block) = (CORE_ADDR) begin;
+ BLOCK_END (new_block) = (CORE_ADDR) end;
+
+ BLOCKVECTOR_BLOCK (symtab->blockvector, i) = new_block;
+
+ if (i == GLOBAL_BLOCK)
+ set_block_symtab (new_block, symtab);
+ }
+
+ /* Fill up the superblock fields for the real blocks, using the
+ real_block fields populated earlier. */
+ for (gdb_block_iter = stab->blocks;
+ gdb_block_iter;
+ gdb_block_iter = gdb_block_iter->next)
+ {
+ if (gdb_block_iter->parent != NULL)
+ BLOCK_SUPERBLOCK (gdb_block_iter->real_block) =
+ gdb_block_iter->parent->real_block;
+ }
+
+ /* Free memory. */
+ gdb_block_iter = stab->blocks;
+
+ for (gdb_block_iter = stab->blocks, gdb_block_iter_tmp = gdb_block_iter->next;
+ gdb_block_iter;
+ gdb_block_iter = gdb_block_iter_tmp)
+ {
+ xfree ((void *) gdb_block_iter->name);
+ xfree (gdb_block_iter);
+ }
+ xfree (stab->linetable);
+ xfree ((char *) stab->file_name);
+ xfree (stab);
+}
+
+/* Called when closing a gdb_objfile. Converts OBJ to a proper
+ objfile. */
+
+static void
+jit_object_close_impl (struct gdb_symbol_callbacks *cb,
+ struct gdb_object *obj)
+{
+ struct gdb_symtab *i, *j;
+ struct objfile *objfile;
+ jit_dbg_reader_data *priv_data;
+
+ priv_data = cb->priv_data;
+
+ objfile = allocate_objfile (NULL, 0);
+ objfile->gdbarch = target_gdbarch;
+
+ terminate_minimal_symbol_table (objfile);
+
+ xfree (objfile->name);
+ objfile->name = xstrdup ("<< JIT compiled code >>");
+
+ j = NULL;
+ for (i = obj->symtabs; i; i = j)
+ {
+ j = i->next;
+ finalize_symtab (i, objfile);
+ }
+ add_objfile_entry (objfile, *priv_data);
+ xfree (obj);
+}
+
+/* Try to read CODE_ENTRY using the loaded jit reader (if any).
+ ENTRY_ADDR is the address of the struct jit_code_entry in the
+ inferior address space. */
+
+static int
+jit_reader_try_read_symtab (struct jit_code_entry *code_entry,
+ CORE_ADDR entry_addr)
+{
+ void *gdb_mem;
+ int status;
+ jit_dbg_reader_data priv_data;
+ struct gdb_reader_funcs *funcs;
+ volatile struct gdb_exception e;
+ struct gdb_symbol_callbacks callbacks =
+ {
+ jit_object_open_impl,
+ jit_symtab_open_impl,
+ jit_block_open_impl,
+ jit_symtab_close_impl,
+ jit_object_close_impl,
+
+ jit_symtab_line_mapping_add_impl,
+ jit_target_read_impl,
+
+ &priv_data
+ };
+
+ priv_data = entry_addr;
+
+ if (!loaded_jit_reader)
+ return 0;
+
+ gdb_mem = xmalloc (code_entry->symfile_size);
+
+ status = 1;
+ TRY_CATCH (e, RETURN_MASK_ALL)
+ if (target_read_memory (code_entry->symfile_addr, gdb_mem,
+ code_entry->symfile_size))
+ status = 0;
+ if (e.reason < 0)
+ status = 0;
+
+ if (status)
+ {
+ funcs = loaded_jit_reader->functions;
+ if (funcs->read (funcs, &callbacks, gdb_mem, code_entry->symfile_size)
+ != GDB_SUCCESS)
+ status = 0;
+ }
+
+ xfree (gdb_mem);
+ if (jit_debug && status == 0)
+ fprintf_unfiltered (gdb_stdlog,
+ "Could not read symtab using the loaded JIT reader.\n");
+ return status;
+}
+
+/* Try to read CODE_ENTRY using BFD. ENTRY_ADDR is the address of the
+ struct jit_code_entry in the inferior address space. */
+
+static void
+jit_bfd_try_read_symtab (struct jit_code_entry *code_entry,
+ CORE_ADDR entry_addr,
+ struct gdbarch *gdbarch)
{
bfd *nbfd;
struct section_addr_info *sai;
struct cleanup *old_cleanups;
int i;
const struct bfd_arch_info *b;
- CORE_ADDR *entry_addr_ptr;
if (jit_debug)
fprintf_unfiltered (gdb_stdlog,
/* This call takes ownership of NBFD. It does not take ownership of SAI. */
objfile = symbol_file_add_from_bfd (nbfd, 0, sai, OBJF_SHARED, NULL);
- /* Remember a mapping from entry_addr to objfile. */
- entry_addr_ptr = xmalloc (sizeof (CORE_ADDR));
- *entry_addr_ptr = entry_addr;
- set_objfile_data (objfile, jit_objfile_data, entry_addr_ptr);
-
do_cleanups (old_cleanups);
+ add_objfile_entry (objfile, entry_addr);
+}
+
+/* This function registers code associated with a JIT code entry. It uses the
+ pointer and size pair in the entry to read the symbol file from the remote
+ and then calls symbol_file_add_from_local_memory to add it as though it were
+ a symbol file added by the user. */
+
+static void
+jit_register_code (struct gdbarch *gdbarch,
+ CORE_ADDR entry_addr, struct jit_code_entry *code_entry)
+{
+ int i, success;
+ const struct bfd_arch_info *b;
+ struct jit_inferior_data *inf_data = get_jit_inferior_data ();
+
+ if (jit_debug)
+ fprintf_unfiltered (gdb_stdlog,
+ "jit_register_code, symfile_addr = %s, "
+ "symfile_size = %s\n",
+ paddress (gdbarch, code_entry->symfile_addr),
+ pulongest (code_entry->symfile_size));
+
+ success = jit_reader_try_read_symtab (code_entry, entry_addr);
+
+ if (!success)
+ jit_bfd_try_read_symtab (code_entry, entry_addr, gdbarch);
}
/* This function unregisters JITed code and frees the corresponding
jit_find_objf_with_entry_addr (CORE_ADDR entry_addr)
{
struct objfile *objf;
- CORE_ADDR *objf_entry_addr;
ALL_OBJFILES (objf)
{
- objf_entry_addr = (CORE_ADDR *) objfile_data (objf, jit_objfile_data);
- if (objf_entry_addr != NULL && *objf_entry_addr == entry_addr)
+ struct jit_objfile_data *objf_data;
+
+ objf_data = objfile_data (objf, jit_objfile_data);
+ if (objf_data != NULL && objf_data->addr == entry_addr)
return objf;
}
return NULL;
jit_breakpoint_re_set_internal (struct gdbarch *gdbarch,
struct jit_inferior_data *inf_data)
{
- if (inf_data->breakpoint_addr == 0)
- {
- struct minimal_symbol *reg_symbol;
-
- /* Lookup the registration symbol. If it is missing, then we assume
- we are not attached to a JIT. */
- reg_symbol = lookup_minimal_symbol (jit_break_name, NULL, NULL);
- if (reg_symbol == NULL)
- return 1;
- inf_data->breakpoint_addr = SYMBOL_VALUE_ADDRESS (reg_symbol);
- if (inf_data->breakpoint_addr == 0)
- return 2;
-
- /* If we have not read the jit descriptor yet (e.g. because the JITer
- itself is in a shared library which just got loaded), do so now. */
- if (inf_data->descriptor_addr == 0)
- jit_inferior_init (gdbarch);
- }
- else
+ struct minimal_symbol *reg_symbol, *desc_symbol;
+ struct objfile *objf;
+ struct jit_objfile_data *objf_data;
+
+ if (inf_data->objfile != NULL)
return 0;
+ /* Lookup the registration symbol. If it is missing, then we assume
+ we are not attached to a JIT. */
+ reg_symbol = lookup_minimal_symbol_and_objfile (jit_break_name, &objf);
+ if (reg_symbol == NULL || SYMBOL_VALUE_ADDRESS (reg_symbol) == 0)
+ return 1;
+
+ desc_symbol = lookup_minimal_symbol (jit_descriptor_name, NULL, objf);
+ if (desc_symbol == NULL || SYMBOL_VALUE_ADDRESS (desc_symbol) == 0)
+ return 1;
+
+ objf_data = get_jit_objfile_data (objf);
+ objf_data->register_code = reg_symbol;
+ objf_data->descriptor = desc_symbol;
+
+ inf_data->objfile = objf;
+
+ jit_inferior_init (gdbarch);
+
if (jit_debug)
fprintf_unfiltered (gdb_stdlog,
"jit_breakpoint_re_set_internal, "
"breakpoint_addr = %s\n",
- paddress (gdbarch, inf_data->breakpoint_addr));
+ paddress (gdbarch, SYMBOL_VALUE_ADDRESS (reg_symbol)));
/* Put a breakpoint in the registration symbol. */
- create_jit_event_breakpoint (gdbarch, inf_data->breakpoint_addr);
+ create_jit_event_breakpoint (gdbarch, SYMBOL_VALUE_ADDRESS (reg_symbol));
return 0;
}
+/* The private data passed around in the frame unwind callback
+ functions. */
+
+struct jit_unwind_private
+{
+ /* Cached register values. See jit_frame_sniffer to see how this
+ works. */
+ struct gdb_reg_value **registers;
+
+ /* The frame being unwound. */
+ struct frame_info *this_frame;
+};
+
+/* Sets the value of a particular register in this frame. */
+
+static void
+jit_unwind_reg_set_impl (struct gdb_unwind_callbacks *cb, int dwarf_regnum,
+ struct gdb_reg_value *value)
+{
+ struct jit_unwind_private *priv;
+ int gdb_reg;
+
+ priv = cb->priv_data;
+
+ gdb_reg = gdbarch_dwarf2_reg_to_regnum (get_frame_arch (priv->this_frame),
+ dwarf_regnum);
+ if (gdb_reg == -1)
+ {
+ if (jit_debug)
+ fprintf_unfiltered (gdb_stdlog,
+ _("Could not recognize DWARF regnum %d"),
+ dwarf_regnum);
+ return;
+ }
+
+ gdb_assert (priv->registers);
+ priv->registers[gdb_reg] = value;
+}
+
+static void
+reg_value_free_impl (struct gdb_reg_value *value)
+{
+ xfree (value);
+}
+
+/* Get the value of register REGNUM in the previous frame. */
+
+static struct gdb_reg_value *
+jit_unwind_reg_get_impl (struct gdb_unwind_callbacks *cb, int regnum)
+{
+ struct jit_unwind_private *priv;
+ struct gdb_reg_value *value;
+ int gdb_reg, size;
+ struct gdbarch *frame_arch;
+
+ priv = cb->priv_data;
+ frame_arch = get_frame_arch (priv->this_frame);
+
+ gdb_reg = gdbarch_dwarf2_reg_to_regnum (frame_arch, regnum);
+ size = register_size (frame_arch, gdb_reg);
+ value = xmalloc (sizeof (struct gdb_reg_value) + size - 1);
+ value->defined = frame_register_read (priv->this_frame, gdb_reg,
+ value->value);
+ value->size = size;
+ value->free = reg_value_free_impl;
+ return value;
+}
+
+/* gdb_reg_value has a free function, which must be called on each
+ saved register value. */
+
+static void
+jit_dealloc_cache (struct frame_info *this_frame, void *cache)
+{
+ struct jit_unwind_private *priv_data = cache;
+ struct gdbarch *frame_arch;
+ int i;
+
+ gdb_assert (priv_data->registers);
+ frame_arch = get_frame_arch (priv_data->this_frame);
+
+ for (i = 0; i < gdbarch_num_regs (frame_arch); i++)
+ if (priv_data->registers[i] && priv_data->registers[i]->free)
+ priv_data->registers[i]->free (priv_data->registers[i]);
+
+ xfree (priv_data->registers);
+ xfree (priv_data);
+}
+
+/* The frame sniffer for the pseudo unwinder.
+
+ While this is nominally a frame sniffer, in the case where the JIT
+ reader actually recognizes the frame, it does a lot more work -- it
+ unwinds the frame and saves the corresponding register values in
+ the cache. jit_frame_prev_register simply returns the saved
+ register values. */
+
+static int
+jit_frame_sniffer (const struct frame_unwind *self,
+ struct frame_info *this_frame, void **cache)
+{
+ struct jit_inferior_data *inf_data;
+ struct jit_unwind_private *priv_data;
+ struct gdb_unwind_callbacks callbacks;
+ struct gdb_reader_funcs *funcs;
+
+ inf_data = get_jit_inferior_data ();
+
+ callbacks.reg_get = jit_unwind_reg_get_impl;
+ callbacks.reg_set = jit_unwind_reg_set_impl;
+ callbacks.target_read = jit_target_read_impl;
+
+ if (loaded_jit_reader == NULL)
+ return 0;
+
+ funcs = loaded_jit_reader->functions;
+
+ gdb_assert (!*cache);
+
+ *cache = XZALLOC (struct jit_unwind_private);
+ priv_data = *cache;
+ priv_data->registers =
+ XCALLOC (gdbarch_num_regs (get_frame_arch (this_frame)),
+ struct gdb_reg_value *);
+ priv_data->this_frame = this_frame;
+
+ callbacks.priv_data = priv_data;
+
+ /* Try to coax the provided unwinder to unwind the stack */
+ if (funcs->unwind (funcs, &callbacks) == GDB_SUCCESS)
+ {
+ if (jit_debug)
+ fprintf_unfiltered (gdb_stdlog, _("Successfully unwound frame using "
+ "JIT reader.\n"));
+ return 1;
+ }
+ if (jit_debug)
+ fprintf_unfiltered (gdb_stdlog, _("Could not unwind frame using "
+ "JIT reader.\n"));
+
+ jit_dealloc_cache (this_frame, *cache);
+ *cache = NULL;
+
+ return 0;
+}
+
+
+/* The frame_id function for the pseudo unwinder. Relays the call to
+ the loaded plugin. */
+
+static void
+jit_frame_this_id (struct frame_info *this_frame, void **cache,
+ struct frame_id *this_id)
+{
+ struct jit_unwind_private private;
+ struct gdb_frame_id frame_id;
+ struct gdb_reader_funcs *funcs;
+ struct gdb_unwind_callbacks callbacks;
+
+ private.registers = NULL;
+ private.this_frame = this_frame;
+
+ /* We don't expect the frame_id function to set any registers, so we
+ set reg_set to NULL. */
+ callbacks.reg_get = jit_unwind_reg_get_impl;
+ callbacks.reg_set = NULL;
+ callbacks.target_read = jit_target_read_impl;
+ callbacks.priv_data = &private;
+
+ gdb_assert (loaded_jit_reader);
+ funcs = loaded_jit_reader->functions;
+
+ frame_id = funcs->get_frame_id (funcs, &callbacks);
+ *this_id = frame_id_build (frame_id.stack_address, frame_id.code_address);
+}
+
+/* Pseudo unwinder function. Reads the previously fetched value for
+ the register from the cache. */
+
+static struct value *
+jit_frame_prev_register (struct frame_info *this_frame, void **cache, int reg)
+{
+ struct jit_unwind_private *priv = *cache;
+ struct gdb_reg_value *value;
+
+ if (priv == NULL)
+ return frame_unwind_got_optimized (this_frame, reg);
+
+ gdb_assert (priv->registers);
+ value = priv->registers[reg];
+ if (value && value->defined)
+ return frame_unwind_got_bytes (this_frame, reg, value->value);
+ else
+ return frame_unwind_got_optimized (this_frame, reg);
+}
+
+/* Relay everything back to the unwinder registered by the JIT debug
+ info reader.*/
+
+static const struct frame_unwind jit_frame_unwind =
+{
+ NORMAL_FRAME,
+ default_frame_unwind_stop_reason,
+ jit_frame_this_id,
+ jit_frame_prev_register,
+ NULL,
+ jit_frame_sniffer,
+ jit_dealloc_cache
+};
+
+
+/* This is the information that is stored at jit_gdbarch_data for each
+ architecture. */
+
+struct jit_gdbarch_data_type
+{
+ /* Has the (pseudo) unwinder been prepended? */
+ int unwinder_registered;
+};
+
+/* Check GDBARCH and prepend the pseudo JIT unwinder if needed. */
+
+static void
+jit_prepend_unwinder (struct gdbarch *gdbarch)
+{
+ struct jit_gdbarch_data_type *data;
+
+ data = gdbarch_data (gdbarch, jit_gdbarch_data);
+ if (!data->unwinder_registered)
+ {
+ frame_unwind_prepend_unwinder (gdbarch, &jit_frame_unwind);
+ data->unwinder_registered = 1;
+ }
+}
+
/* Register any already created translations. */
static void
if (jit_debug)
fprintf_unfiltered (gdb_stdlog, "jit_inferior_init\n");
+ jit_prepend_unwinder (gdbarch);
+
inf_data = get_jit_inferior_data ();
if (jit_breakpoint_re_set_internal (gdbarch, inf_data) != 0)
return;
- if (inf_data->descriptor_addr == 0)
- {
- struct minimal_symbol *desc_symbol;
-
- /* Lookup the descriptor symbol and cache the addr. If it is
- missing, we assume we are not attached to a JIT and return early. */
- desc_symbol = lookup_minimal_symbol (jit_descriptor_name, NULL, NULL);
- if (desc_symbol == NULL)
- return;
-
- inf_data->descriptor_addr = SYMBOL_VALUE_ADDRESS (desc_symbol);
- if (inf_data->descriptor_addr == 0)
- return;
- }
-
- if (jit_debug)
- fprintf_unfiltered (gdb_stdlog,
- "jit_inferior_init, descriptor_addr = %s\n",
- paddress (gdbarch, inf_data->descriptor_addr));
-
/* Read the descriptor so we can check the version number and load
any already JITed functions. */
- jit_read_descriptor (gdbarch, &descriptor, inf_data->descriptor_addr);
+ if (!jit_read_descriptor (gdbarch, &descriptor, inf_data))
+ return;
/* Check that the version number agrees with that we support. */
if (descriptor.version != 1)
- error (_("Unsupported JIT protocol version in descriptor!"));
+ {
+ printf_unfiltered (_("Unsupported JIT protocol version %ld "
+ "in descriptor (expected 1)\n"),
+ (long) descriptor.version);
+ return;
+ }
/* If we've attached to a running program, we need to check the descriptor
to register any functions that were already generated. */
get_jit_inferior_data ());
}
-/* Reset inferior_data, so sybols will be looked up again, and jit_breakpoint
- will be reset. */
-
-static void
-jit_reset_inferior_data_and_breakpoints (void)
-{
- struct jit_inferior_data *inf_data;
-
- /* Force jit_inferior_init to re-lookup of jit symbol addresses. */
- inf_data = get_jit_inferior_data ();
- inf_data->breakpoint_addr = 0;
- inf_data->descriptor_addr = 0;
-
- /* Remove any existing JIT breakpoint(s). */
- remove_jit_event_breakpoints ();
-
- jit_inferior_init (target_gdbarch);
-}
-
-/* Wrapper to match the observer function pointer prototype. */
-
-static void
-jit_inferior_created_observer (struct target_ops *objfile, int from_tty)
-{
- jit_reset_inferior_data_and_breakpoints ();
-}
-
/* This function cleans up any code entries left over when the
inferior exits. We get left over code when the inferior exits
without unregistering its code, for example when it crashes. */
struct objfile *temp;
ALL_OBJFILES_SAFE (objf, temp)
- if (objfile_data (objf, jit_objfile_data) != NULL)
- jit_unregister_code (objf);
-}
+ {
+ struct jit_objfile_data *objf_data = objfile_data (objf,
+ jit_objfile_data);
-static void
-jit_executable_changed_observer (void)
-{
- jit_reset_inferior_data_and_breakpoints ();
+ if (objf_data != NULL && objf_data->addr != 0)
+ jit_unregister_code (objf);
+ }
}
void
struct objfile *objf;
/* Read the descriptor from remote memory. */
- jit_read_descriptor (gdbarch, &descriptor,
- get_jit_inferior_data ()->descriptor_addr);
+ if (!jit_read_descriptor (gdbarch, &descriptor, get_jit_inferior_data ()))
+ return;
entry_addr = descriptor.relevant_entry;
/* Do the corresponding action. */
}
}
+/* Called to free the data allocated to the jit_inferior_data slot. */
+
+static void
+free_objfile_data (struct objfile *objfile, void *data)
+{
+ struct jit_objfile_data *objf_data = data;
+
+ if (objf_data->register_code != NULL)
+ {
+ struct jit_inferior_data *inf_data = get_jit_inferior_data ();
+
+ if (inf_data->objfile == objfile)
+ inf_data->objfile = NULL;
+ }
+
+ xfree (data);
+}
+
+/* Initialize the jit_gdbarch_data slot with an instance of struct
+ jit_gdbarch_data_type */
+
+static void *
+jit_gdbarch_data_init (struct obstack *obstack)
+{
+ struct jit_gdbarch_data_type *data;
+
+ data = obstack_alloc (obstack, sizeof (struct jit_gdbarch_data_type));
+ data->unwinder_registered = 0;
+ return data;
+}
+
/* Provide a prototype to silence -Wmissing-prototypes. */
extern void _initialize_jit (void);
void
_initialize_jit (void)
{
+ jit_reader_dir = relocate_gdb_directory (JIT_READER_DIR,
+ JIT_READER_DIR_RELOCATABLE);
add_setshow_zinteger_cmd ("jit", class_maintenance, &jit_debug,
_("Set JIT debugging."),
_("Show JIT debugging."),
show_jit_debug,
&setdebuglist, &showdebuglist);
- observer_attach_inferior_created (jit_inferior_created_observer);
observer_attach_inferior_exit (jit_inferior_exit_hook);
- observer_attach_executable_changed (jit_executable_changed_observer);
- jit_objfile_data = register_objfile_data ();
+ jit_objfile_data =
+ register_objfile_data_with_cleanup (NULL, free_objfile_data);
jit_inferior_data =
register_inferior_data_with_cleanup (jit_inferior_data_cleanup);
+ jit_gdbarch_data = gdbarch_data_register_pre_init (jit_gdbarch_data_init);
+ if (is_dl_available ())
+ {
+ add_com ("jit-reader-load", no_class, jit_reader_load_command, _("\
+Load FILE as debug info reader and unwinder for JIT compiled code.\n\
+Usage: jit-reader-load FILE\n\
+Try to load file FILE as a debug info reader (and unwinder) for\n\
+JIT compiled code. The file is loaded from " JIT_READER_DIR ",\n\
+relocated relative to the GDB executable if required."));
+ add_com ("jit-reader-unload", no_class, jit_reader_unload_command, _("\
+Unload the currently loaded JIT debug info reader.\n\
+Usage: jit-reader-unload FILE\n\n\
+Do \"help jit-reader-load\" for info on loading debug info readers."));
+ }
}
projects / deliverable / binutils-gdb.git / blobdiff