/* Handle JIT code generation in the inferior for GDB, the GNU Debugger.
- Copyright (C) 2009, 2010 Free Software Foundation, Inc.
+ Copyright (C) 2009-2022 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 "filenames.h"
+#include "frame-unwind.h"
+#include "gdbcmd.h"
#include "gdbcore.h"
-#include "observer.h"
+#include "inferior.h"
+#include "observable.h"
#include "objfiles.h"
+#include "regcache.h"
#include "symfile.h"
#include "symtab.h"
#include "target.h"
-#include "gdb_stat.h"
+#include "gdbsupport/gdb-dlfcn.h"
+#include <sys/stat.h>
+#include "gdb_bfd.h"
+#include "readline/tilde.h"
+#include "completer.h"
+#include <forward_list>
-static const struct objfile_data *jit_objfile_data;
+static std::string jit_reader_dir;
-static const char *const jit_break_name = "__jit_debug_register_code";
+static const char jit_break_name[] = "__jit_debug_register_code";
-static const char *const jit_descriptor_name = "__jit_debug_descriptor";
+static const char jit_descriptor_name[] = "__jit_debug_descriptor";
-/* This is the address of the JIT descriptor in the inferior. */
+static void jit_inferior_created_hook (inferior *inf);
+static void jit_inferior_exit_hook (struct inferior *inf);
-static CORE_ADDR jit_descriptor_addr = 0;
+/* An unwinder is registered for every gdbarch. This key is used to
+ remember if the unwinder has been registered for a particular
+ gdbarch. */
-/* This is a boolean indicating whether we're currently registering code. This
- is used to avoid re-entering the registration code. We want to check for
- new JITed every time a new object file is loaded, but we want to avoid
- checking for new code while we're registering object files for JITed code.
- Therefore, we flip this variable to 1 before registering new object files,
- and set it to 0 before returning. */
+static struct gdbarch_data *jit_gdbarch_data;
-static int registering_code = 0;
+/* True if we want to see trace of jit level stuff. */
-/* Helper cleanup function to clear an integer flag like the one above. */
+static bool jit_debug = false;
+
+/* Print a "jit" debug statement. */
+
+#define jit_debug_printf(fmt, ...) \
+ debug_prefixed_printf_cond (jit_debug, "jit", fmt, ##__VA_ARGS__)
+
+static void
+show_jit_debug (struct ui_file *file, int from_tty,
+ struct cmd_list_element *c, const char *value)
+{
+ fprintf_filtered (file, _("JIT debugging is %s.\n"), value);
+}
+
+/* Implementation of the "maintenance info jit" command. */
static void
-clear_int (void *int_addr)
+maint_info_jit_cmd (const char *args, int from_tty)
{
- *((int *) int_addr) = 0;
+ inferior *inf = current_inferior ();
+ bool printed_header = false;
+
+ gdb::optional<ui_out_emit_table> table_emitter;
+
+ /* Print a line for each JIT-ed objfile. */
+ for (objfile *obj : inf->pspace->objfiles ())
+ {
+ if (obj->jited_data == nullptr)
+ continue;
+
+ if (!printed_header)
+ {
+ table_emitter.emplace (current_uiout, 3, -1, "jit-created-objfiles");
+
+ /* The +2 allows for the leading '0x', then one character for
+ every 4-bits. */
+ int addr_width = 2 + (gdbarch_ptr_bit (obj->arch ()) / 4);
+
+ /* The std::max here selects between the width of an address (as
+ a string) and the width of the column header string. */
+ current_uiout->table_header (std::max (addr_width, 22), ui_left,
+ "jit_code_entry-address",
+ "jit_code_entry address");
+ current_uiout->table_header (std::max (addr_width, 15), ui_left,
+ "symfile-address", "symfile address");
+ current_uiout->table_header (20, ui_left,
+ "symfile-size", "symfile size");
+ current_uiout->table_body ();
+
+ printed_header = true;
+ }
+
+ ui_out_emit_tuple tuple_emitter (current_uiout, "jit-objfile");
+
+ current_uiout->field_core_addr ("jit_code_entry-address", obj->arch (),
+ obj->jited_data->addr);
+ current_uiout->field_core_addr ("symfile-address", obj->arch (),
+ obj->jited_data->symfile_addr);
+ current_uiout->field_unsigned ("symfile-size",
+ obj->jited_data->symfile_size);
+ current_uiout->text ("\n");
+ }
}
-struct target_buffer
+struct jit_reader
{
- CORE_ADDR base;
- size_t size;
+ jit_reader (struct gdb_reader_funcs *f, gdb_dlhandle_up &&h)
+ : functions (f), handle (std::move (h))
+ {
+ }
+
+ ~jit_reader ()
+ {
+ functions->destroy (functions);
+ }
+
+ DISABLE_COPY_AND_ASSIGN (jit_reader);
+
+ struct gdb_reader_funcs *functions;
+ gdb_dlhandle_up handle;
};
-/* Openning the file is a no-op. */
+/* One reader that has been loaded successfully, and can potentially be used to
+ parse debug info. */
-static void *
-mem_bfd_iovec_open (struct bfd *abfd, void *open_closure)
+static struct jit_reader *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)
{
- return open_closure;
+ reader_init_fn_type *init_fn;
+ struct gdb_reader_funcs *funcs = NULL;
+
+ jit_debug_printf ("Opening shared object %s", file_name);
+
+ gdb_dlhandle_up so = gdb_dlopen (file_name);
+
+ init_fn = (reader_init_fn_type *) 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."));
+
+ return new jit_reader (funcs, std::move (so));
}
-/* Closing the file is just freeing the base/size pair on our side. */
+/* Provides the jit-reader-load command. */
-static int
-mem_bfd_iovec_close (struct bfd *abfd, void *stream)
+static void
+jit_reader_load_command (const char *args, int from_tty)
{
- xfree (stream);
- return 1;
+ if (args == NULL)
+ error (_("No reader name provided."));
+ gdb::unique_xmalloc_ptr<char> file (tilde_expand (args));
+
+ if (loaded_jit_reader != NULL)
+ error (_("JIT reader already loaded. Run jit-reader-unload first."));
+
+ if (!IS_ABSOLUTE_PATH (file.get ()))
+ file = xstrprintf ("%s%s%s", jit_reader_dir.c_str (),
+ SLASH_STRING, file.get ());
+
+ loaded_jit_reader = jit_reader_load (file.get ());
+ reinit_frame_cache ();
+ jit_inferior_created_hook (current_inferior ());
}
-/* For reading the file, we just need to pass through to target_read_memory and
- fix up the arguments and return values. */
+/* Provides the jit-reader-unload command. */
-static file_ptr
-mem_bfd_iovec_pread (struct bfd *abfd, void *stream, void *buf,
- file_ptr nbytes, file_ptr offset)
+static void
+jit_reader_unload_command (const char *args, int from_tty)
{
- int err;
- struct target_buffer *buffer = (struct target_buffer *) stream;
+ if (!loaded_jit_reader)
+ error (_("No JIT reader loaded."));
- /* If this read will read all of the file, limit it to just the rest. */
- if (offset + nbytes > buffer->size)
- nbytes = buffer->size - offset;
+ reinit_frame_cache ();
+ jit_inferior_exit_hook (current_inferior ());
- /* If there are no more bytes left, we've reached EOF. */
- if (nbytes == 0)
- return 0;
+ delete loaded_jit_reader;
+ loaded_jit_reader = NULL;
+}
- err = target_read_memory (buffer->base + offset, (gdb_byte *) buf, nbytes);
- if (err)
- return -1;
+/* Destructor for jiter_objfile_data. */
- return nbytes;
+jiter_objfile_data::~jiter_objfile_data ()
+{
+ if (this->jit_breakpoint != nullptr)
+ delete_breakpoint (this->jit_breakpoint);
}
-/* For statting the file, we only support the st_size attribute. */
+/* Fetch the jiter_objfile_data associated with OBJF. If no data exists
+ yet, make a new structure and attach it. */
-static int
-mem_bfd_iovec_stat (struct bfd *abfd, void *stream, struct stat *sb)
+static jiter_objfile_data *
+get_jiter_objfile_data (objfile *objf)
{
- struct target_buffer *buffer = (struct target_buffer*) stream;
+ if (objf->jiter_data == nullptr)
+ objf->jiter_data.reset (new jiter_objfile_data ());
- sb->st_size = buffer->size;
- return 0;
+ return objf->jiter_data.get ();
}
-/* Open a BFD from the target's memory. */
+/* Remember OBJFILE has been created for struct jit_code_entry located
+ at inferior address ENTRY. */
-static struct bfd *
-bfd_open_from_target_memory (CORE_ADDR addr, size_t size, char *target)
+static void
+add_objfile_entry (struct objfile *objfile, CORE_ADDR entry,
+ CORE_ADDR symfile_addr, ULONGEST symfile_size)
{
- const char *filename = xstrdup ("<in-memory>");
- struct target_buffer *buffer = xmalloc (sizeof (struct target_buffer));
+ gdb_assert (objfile->jited_data == nullptr);
- buffer->base = addr;
- buffer->size = size;
- return bfd_openr_iovec (filename, target,
- mem_bfd_iovec_open,
- buffer,
- mem_bfd_iovec_pread,
- mem_bfd_iovec_close,
- mem_bfd_iovec_stat);
+ objfile->jited_data.reset (new jited_objfile_data (entry, symfile_addr,
+ symfile_size));
}
-/* Helper function for reading the global JIT descriptor from remote memory. */
+/* Helper function for reading the global JIT descriptor from remote
+ memory. Returns true if all went well, false otherwise. */
-static void
-jit_read_descriptor (struct gdbarch *gdbarch,
- struct jit_descriptor *descriptor)
+static bool
+jit_read_descriptor (gdbarch *gdbarch,
+ jit_descriptor *descriptor,
+ objfile *jiter)
{
int err;
struct type *ptr_type;
gdb_byte *desc_buf;
enum bfd_endian byte_order = gdbarch_byte_order (gdbarch);
+ gdb_assert (jiter != nullptr);
+ jiter_objfile_data *objf_data = jiter->jiter_data.get ();
+ gdb_assert (objf_data != nullptr);
+
+ CORE_ADDR addr = MSYMBOL_VALUE_ADDRESS (jiter, objf_data->descriptor);
+
+ jit_debug_printf ("descriptor_addr = %s", paddress (gdbarch, addr));
+
/* Figure out how big the descriptor is on the remote and how to read it. */
ptr_type = builtin_type (gdbarch)->builtin_data_ptr;
ptr_size = TYPE_LENGTH (ptr_type);
desc_size = 8 + 2 * ptr_size; /* Two 32-bit ints and two pointers. */
- desc_buf = alloca (desc_size);
+ desc_buf = (gdb_byte *) alloca (desc_size);
/* Read the descriptor. */
- err = target_read_memory (jit_descriptor_addr, desc_buf, desc_size);
+ err = target_read_memory (addr, desc_buf, desc_size);
if (err)
- error (_("Unable to read JIT descriptor from remote memory!"));
+ {
+ fprintf_unfiltered (gdb_stderr, _("Unable to read JIT descriptor from "
+ "remote memory\n"));
+ return false;
+ }
/* 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 true;
}
/* Helper function for reading a JITed code entry from remote memory. */
jit_read_code_entry (struct gdbarch *gdbarch,
CORE_ADDR code_addr, struct jit_code_entry *code_entry)
{
- int err;
+ int err, off;
struct type *ptr_type;
int ptr_size;
int entry_size;
+ int align_bytes;
gdb_byte *entry_buf;
enum bfd_endian byte_order = gdbarch_byte_order (gdbarch);
/* 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. */
- entry_buf = alloca (entry_size);
+
+ /* Figure out where the uint64_t value will be. */
+ align_bytes = type_align (builtin_type (gdbarch)->builtin_uint64);
+ 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 = (gdb_byte *) alloca (entry_size);
/* Read the entry. */
err = target_read_memory (code_addr, entry_buf, entry_size);
code_entry->symfile_addr =
extract_typed_address (&entry_buf[2 * ptr_size], ptr_type);
code_entry->symfile_size =
- extract_unsigned_integer (&entry_buf[3 * ptr_size], 8, byte_order);
+ 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_block (gdb_block *parent, CORE_ADDR begin, CORE_ADDR end,
+ const char *name)
+ : parent (parent),
+ begin (begin),
+ end (end),
+ name (name != nullptr ? xstrdup (name) : nullptr)
+ {}
+
+ /* The parent of this block. */
+ struct gdb_block *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 = nullptr;
+
+ /* 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. */
+ gdb::unique_xmalloc_ptr<char> name;
+};
+
+/* Proxy object for building a symtab. */
+
+struct gdb_symtab
+{
+ explicit gdb_symtab (const char *file_name)
+ : file_name (file_name != nullptr ? file_name : "")
+ {}
+
+ /* The list of blocks in this symtab. These will eventually be
+ converted to real blocks.
+
+ This is specifically a linked list, instead of, for example, a vector,
+ because the pointers are returned to the user's debug info reader. So
+ it's important that the objects don't change location during their
+ lifetime (which would happen with a vector of objects getting resized). */
+ std::forward_list<gdb_block> blocks;
+
+ /* The number of blocks inserted. */
+ int nblocks = 0;
+
+ /* A mapping between line numbers to PC. */
+ gdb::unique_xmalloc_ptr<struct linetable> linetable;
+
+ /* The source file for this symtab. */
+ std::string file_name;
+};
+
+/* Proxy object for building an object. */
+
+struct gdb_object
+{
+ /* Symtabs of this object.
+
+ This is specifically a linked list, instead of, for example, a vector,
+ because the pointers are returned to the user's debug info reader. So
+ it's important that the objects don't change location during their
+ lifetime (which would happen with a vector of objects getting resized). */
+ std::forward_list<gdb_symtab> symtabs;
+};
+
+/* The type of the `private' data passed around by the callback
+ functions. */
+
+struct jit_dbg_reader_data
+{
+ /* Address of the jit_code_entry in the inferior's address space. */
+ CORE_ADDR entry_addr;
+
+ /* The code entry, copied in our address space. */
+ const jit_code_entry &entry;
+
+ struct gdbarch *gdbarch;
+};
+
+/* 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_byte *) 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 new 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)
+{
+ /* CB stays unused. See comment in jit_object_open_impl. */
+
+ object->symtabs.emplace_front (file_name);
+ return &object->symtabs.front ();
+}
+
+/* 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)
+{
+ /* Place the block at the beginning of the list, it will be sorted when the
+ symtab is finalized. */
+ symtab->blocks.emplace_front (parent, begin, end, name);
+ symtab->nblocks++;
+
+ return &symtab->blocks.front ();
+}
+
+/* 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;
+ int alloc_len;
+
+ if (nlines < 1)
+ return;
+
+ alloc_len = sizeof (struct linetable)
+ + (nlines - 1) * sizeof (struct linetable_entry);
+ stab->linetable.reset (XNEWVAR (struct linetable, alloc_len));
+ 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;
+ stab->linetable->item[i].is_stmt = 1;
+ }
+}
+
+/* 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 compunit_symtab *cust;
+ size_t blockvector_size;
+ CORE_ADDR begin, end;
+ struct blockvector *bv;
+
+ int actual_nblocks = FIRST_LOCAL_BLOCK + stab->nblocks;
+
+ /* Sort the blocks in the order they should appear in the blockvector. */
+ stab->blocks.sort([] (const gdb_block &a, const gdb_block &b)
+ {
+ if (a.begin != b.begin)
+ return a.begin < b.begin;
+
+ return a.end > b.end;
+ });
+
+ cust = allocate_compunit_symtab (objfile, stab->file_name.c_str ());
+ symtab *filetab = allocate_symtab (cust, stab->file_name.c_str ());
+ add_compunit_symtab_to_objfile (cust);
+
+ /* JIT compilers compile in memory. */
+ cust->set_dirname (nullptr);
+
+ /* Copy over the linetable entry if one was provided. */
+ if (stab->linetable)
+ {
+ size_t size = ((stab->linetable->nitems - 1)
+ * sizeof (struct linetable_entry)
+ + sizeof (struct linetable));
+ filetab->set_linetable ((struct linetable *)
+ obstack_alloc (&objfile->objfile_obstack, size));
+ memcpy (filetab->linetable (), stab->linetable.get (), size);
+ }
+
+ blockvector_size = (sizeof (struct blockvector)
+ + (actual_nblocks - 1) * sizeof (struct block *));
+ bv = (struct blockvector *) obstack_alloc (&objfile->objfile_obstack,
+ blockvector_size);
+ cust->set_blockvector (bv);
+
+ /* At the end of this function, (begin, end) will contain the PC range this
+ entire blockvector spans. */
+ BLOCKVECTOR_MAP (bv) = NULL;
+ begin = stab->blocks.front ().begin;
+ end = stab->blocks.front ().end;
+ BLOCKVECTOR_NBLOCKS (bv) = actual_nblocks;
+
+ /* First run over all the gdb_block objects, creating a real block
+ object for each. Simultaneously, keep setting the real_block
+ fields. */
+ int block_idx = FIRST_LOCAL_BLOCK;
+ for (gdb_block &gdb_block_iter : stab->blocks)
+ {
+ struct block *new_block = allocate_block (&objfile->objfile_obstack);
+ struct symbol *block_name = new (&objfile->objfile_obstack) symbol;
+ struct type *block_type = arch_type (objfile->arch (),
+ TYPE_CODE_VOID,
+ TARGET_CHAR_BIT,
+ "void");
+
+ BLOCK_MULTIDICT (new_block)
+ = mdict_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. */
+ block_name->set_domain (VAR_DOMAIN);
+ block_name->set_aclass_index (LOC_BLOCK);
+ symbol_set_symtab (block_name, filetab);
+ block_name->set_type (lookup_function_type (block_type));
+ SYMBOL_BLOCK_VALUE (block_name) = new_block;
+
+ block_name->m_name = obstack_strdup (&objfile->objfile_obstack,
+ gdb_block_iter.name.get ());
+
+ BLOCK_FUNCTION (new_block) = block_name;
+
+ BLOCKVECTOR_BLOCK (bv, block_idx) = 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;
+
+ block_idx++;
+ }
+
+ /* Now add the special blocks. */
+ struct block *block_iter = NULL;
+ for (enum block_enum i : { GLOBAL_BLOCK, STATIC_BLOCK })
+ {
+ struct block *new_block;
+
+ new_block = (i == GLOBAL_BLOCK
+ ? allocate_global_block (&objfile->objfile_obstack)
+ : allocate_block (&objfile->objfile_obstack));
+ BLOCK_MULTIDICT (new_block)
+ = mdict_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 (bv, i) = new_block;
+
+ if (i == GLOBAL_BLOCK)
+ set_block_compunit_symtab (new_block, cust);
+ }
+
+ /* Fill up the superblock fields for the real blocks, using the
+ real_block fields populated earlier. */
+ for (gdb_block &gdb_block_iter : stab->blocks)
+ {
+ if (gdb_block_iter.parent != NULL)
+ {
+ /* If the plugin specifically mentioned a parent block, we
+ use that. */
+ BLOCK_SUPERBLOCK (gdb_block_iter.real_block) =
+ gdb_block_iter.parent->real_block;
+ }
+ else
+ {
+ /* And if not, we set a default parent block. */
+ BLOCK_SUPERBLOCK (gdb_block_iter.real_block) =
+ BLOCKVECTOR_BLOCK (bv, STATIC_BLOCK);
+ }
+ }
+}
+
+/* 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)
+{
+ jit_dbg_reader_data *priv_data = (jit_dbg_reader_data *) cb->priv_data;
+ std::string objfile_name
+ = string_printf ("<< JIT compiled code at %s >>",
+ paddress (priv_data->gdbarch,
+ priv_data->entry.symfile_addr));
+
+ objfile *objfile = objfile::make (nullptr, objfile_name.c_str (),
+ OBJF_NOT_FILENAME);
+ objfile->per_bfd->gdbarch = priv_data->gdbarch;
+
+ for (gdb_symtab &symtab : obj->symtabs)
+ finalize_symtab (&symtab, objfile);
+
+ add_objfile_entry (objfile, priv_data->entry_addr,
+ priv_data->entry.symfile_addr,
+ priv_data->entry.symfile_size);
+
+ delete 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 (gdbarch *gdbarch, jit_code_entry *code_entry,
+ CORE_ADDR entry_addr)
+{
+ int status;
+ jit_dbg_reader_data priv_data
+ {
+ entry_addr,
+ *code_entry,
+ gdbarch
+ };
+ struct gdb_reader_funcs *funcs;
+ 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
+ };
+
+ if (!loaded_jit_reader)
+ return 0;
+
+ gdb::byte_vector gdb_mem (code_entry->symfile_size);
+
+ status = 1;
+ try
+ {
+ if (target_read_memory (code_entry->symfile_addr, gdb_mem.data (),
+ code_entry->symfile_size))
+ status = 0;
+ }
+ catch (const gdb_exception &e)
+ {
+ status = 0;
+ }
+
+ if (status)
+ {
+ funcs = loaded_jit_reader->functions;
+ if (funcs->read (funcs, &callbacks, gdb_mem.data (),
+ code_entry->symfile_size)
+ != GDB_SUCCESS)
+ status = 0;
+ }
+
+ if (status == 0)
+ jit_debug_printf ("Could not read symtab using the loaded JIT reader.");
+
+ 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 bfd_section *sec;
struct objfile *objfile;
- struct cleanup *old_cleanups, *my_cleanups;
- int i;
const struct bfd_arch_info *b;
- CORE_ADDR *entry_addr_ptr;
- nbfd = bfd_open_from_target_memory (code_entry->symfile_addr,
- code_entry->symfile_size, gnutarget);
- old_cleanups = make_cleanup_bfd_close (nbfd);
+ jit_debug_printf ("symfile_addr = %s, symfile_size = %s",
+ paddress (gdbarch, code_entry->symfile_addr),
+ pulongest (code_entry->symfile_size));
+
+ gdb_bfd_ref_ptr nbfd (gdb_bfd_open_from_target_memory
+ (code_entry->symfile_addr, code_entry->symfile_size, gnutarget));
+ if (nbfd == NULL)
+ {
+ fputs_unfiltered (_("Error opening JITed symbol file, ignoring it.\n"),
+ gdb_stderr);
+ return;
+ }
/* Check the format. NOTE: This initializes important data that GDB uses!
We would segfault later without this line. */
- if (!bfd_check_format (nbfd, bfd_object))
+ if (!bfd_check_format (nbfd.get (), bfd_object))
{
- printf_unfiltered (_("\
+ fprintf_unfiltered (gdb_stderr, _("\
JITed symbol file is not an object file, ignoring it.\n"));
- do_cleanups (old_cleanups);
return;
}
/* Check bfd arch. */
b = gdbarch_bfd_arch_info (gdbarch);
- if (b->compatible (b, bfd_get_arch_info (nbfd)) != b)
+ if (b->compatible (b, bfd_get_arch_info (nbfd.get ())) != b)
warning (_("JITed object file architecture %s is not compatible "
- "with target architecture %s."), bfd_get_arch_info
- (nbfd)->printable_name, b->printable_name);
+ "with target architecture %s."),
+ bfd_get_arch_info (nbfd.get ())->printable_name,
+ b->printable_name);
/* Read the section address information out of the symbol file. Since the
file is generated by the JIT at runtime, it should all of the absolute
addresses that we care about. */
- sai = alloc_section_addr_info (bfd_count_sections (nbfd));
- make_cleanup_free_section_addr_info (sai);
- i = 0;
+ section_addr_info sai;
for (sec = nbfd->sections; sec != NULL; sec = sec->next)
- if ((bfd_get_section_flags (nbfd, sec) & (SEC_ALLOC|SEC_LOAD)) != 0)
+ if ((bfd_section_flags (sec) & (SEC_ALLOC|SEC_LOAD)) != 0)
{
- /* We assume that these virtual addresses are absolute, and do not
- treat them as offsets. */
- sai->other[i].addr = bfd_get_section_vma (nbfd, sec);
- sai->other[i].name = xstrdup (bfd_get_section_name (nbfd, sec));
- sai->other[i].sectindex = sec->index;
- ++i;
+ /* We assume that these virtual addresses are absolute, and do not
+ treat them as offsets. */
+ sai.emplace_back (bfd_section_vma (sec),
+ bfd_section_name (sec),
+ sec->index);
}
- /* Raise this flag while we register code so we won't trigger any
- re-registration. */
- registering_code = 1;
- my_cleanups = make_cleanup (clear_int, ®istering_code);
-
- /* This call takes ownership of sai. */
- objfile = symbol_file_add_from_bfd (nbfd, 0, sai, OBJF_SHARED);
-
- /* Clear the registering_code flag. */
- do_cleanups (my_cleanups);
+ /* This call does not take ownership of SAI. */
+ objfile = symbol_file_add_from_bfd (nbfd.get (),
+ bfd_get_filename (nbfd.get ()), 0,
+ &sai,
+ OBJF_SHARED | OBJF_NOT_FILENAME, 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);
-
- discard_cleanups (old_cleanups);
+ add_objfile_entry (objfile, entry_addr, code_entry->symfile_addr,
+ code_entry->symfile_size);
}
-/* This function unregisters JITed code and frees the corresponding objfile. */
+/* 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_unregister_code (struct objfile *objfile)
+jit_register_code (struct gdbarch *gdbarch,
+ CORE_ADDR entry_addr, struct jit_code_entry *code_entry)
{
- free_objfile (objfile);
+ int success;
+
+ jit_debug_printf ("symfile_addr = %s, symfile_size = %s",
+ paddress (gdbarch, code_entry->symfile_addr),
+ pulongest (code_entry->symfile_size));
+
+ success = jit_reader_try_read_symtab (gdbarch, code_entry, entry_addr);
+
+ if (!success)
+ jit_bfd_try_read_symtab (code_entry, entry_addr, gdbarch);
}
/* Look up the objfile with this code entry address. */
static struct objfile *
jit_find_objf_with_entry_addr (CORE_ADDR entry_addr)
{
- struct objfile *objf;
- CORE_ADDR *objf_entry_addr;
-
- ALL_OBJFILES (objf)
+ for (objfile *objf : current_program_space->objfiles ())
{
- objf_entry_addr = (CORE_ADDR *) objfile_data (objf, jit_objfile_data);
- if (objf_entry_addr != NULL && *objf_entry_addr == entry_addr)
- return objf;
+ if (objf->jited_data != nullptr && objf->jited_data->addr == entry_addr)
+ return objf;
}
+
return NULL;
}
-/* (Re-)Initialize the jit breakpoint handler, and register any already
- created translations. */
+/* This is called when a breakpoint is deleted. It updates the
+ inferior's cache, if needed. */
static void
-jit_inferior_init (struct gdbarch *gdbarch)
+jit_breakpoint_deleted (struct breakpoint *b)
{
- struct minimal_symbol *reg_symbol;
- struct minimal_symbol *desc_symbol;
- CORE_ADDR reg_addr;
- struct jit_descriptor descriptor;
- struct jit_code_entry cur_entry;
- CORE_ADDR cur_entry_addr;
- struct cleanup *old_cleanups;
-
- /* When we register code, GDB resets its breakpoints in case symbols have
- changed. That in turn calls this handler, which makes us look for new
- code again. To avoid being re-entered, we check this flag. */
- if (registering_code)
+ if (b->type != bp_jit_event)
return;
- /* 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;
- reg_addr = SYMBOL_VALUE_ADDRESS (reg_symbol);
- if (reg_addr == 0)
- return;
+ for (bp_location *iter : b->locations ())
+ {
+ for (objfile *objf : iter->pspace->objfiles ())
+ {
+ jiter_objfile_data *jiter_data = objf->jiter_data.get ();
+
+ if (jiter_data != nullptr
+ && jiter_data->jit_breakpoint == iter->owner)
+ {
+ jiter_data->cached_code_address = 0;
+ jiter_data->jit_breakpoint = nullptr;
+ }
+ }
+ }
+}
- /* 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;
- jit_descriptor_addr = SYMBOL_VALUE_ADDRESS (desc_symbol);
- if (jit_descriptor_addr == 0)
- return;
+/* (Re-)Initialize the jit breakpoints for JIT-producing objfiles in
+ PSPACE. */
+
+static void
+jit_breakpoint_re_set_internal (struct gdbarch *gdbarch, program_space *pspace)
+{
+ for (objfile *the_objfile : pspace->objfiles ())
+ {
+ /* Skip separate debug objects. */
+ if (the_objfile->separate_debug_objfile_backlink != nullptr)
+ continue;
+
+ if (the_objfile->skip_jit_symbol_lookup)
+ continue;
+
+ /* Lookup the registration symbol. If it is missing, then we
+ assume we are not attached to a JIT. */
+ bound_minimal_symbol reg_symbol
+ = lookup_minimal_symbol (jit_break_name, nullptr, the_objfile);
+ if (reg_symbol.minsym == NULL
+ || BMSYMBOL_VALUE_ADDRESS (reg_symbol) == 0)
+ {
+ /* No need to repeat the lookup the next time. */
+ the_objfile->skip_jit_symbol_lookup = true;
+ continue;
+ }
+
+ bound_minimal_symbol desc_symbol
+ = lookup_minimal_symbol (jit_descriptor_name, NULL, the_objfile);
+ if (desc_symbol.minsym == NULL
+ || BMSYMBOL_VALUE_ADDRESS (desc_symbol) == 0)
+ {
+ /* No need to repeat the lookup the next time. */
+ the_objfile->skip_jit_symbol_lookup = true;
+ continue;
+ }
+
+ jiter_objfile_data *objf_data
+ = get_jiter_objfile_data (the_objfile);
+ objf_data->register_code = reg_symbol.minsym;
+ objf_data->descriptor = desc_symbol.minsym;
+
+ CORE_ADDR addr = MSYMBOL_VALUE_ADDRESS (the_objfile,
+ objf_data->register_code);
+
+ jit_debug_printf ("breakpoint_addr = %s", paddress (gdbarch, addr));
+
+ /* Check if we need to re-create the breakpoint. */
+ if (objf_data->cached_code_address == addr)
+ continue;
+
+ /* Delete the old breakpoint. */
+ if (objf_data->jit_breakpoint != nullptr)
+ delete_breakpoint (objf_data->jit_breakpoint);
+
+ /* Put a breakpoint in the registration symbol. */
+ objf_data->cached_code_address = addr;
+ objf_data->jit_breakpoint = create_jit_event_breakpoint (gdbarch, addr);
+ }
+}
+
+/* The private data passed around in the frame unwind callback
+ functions. */
- /* Read the descriptor so we can check the version number and load any already
- JITed functions. */
- jit_read_descriptor (gdbarch, &descriptor);
+struct jit_unwind_private
+{
+ /* Cached register values. See jit_frame_sniffer to see how this
+ works. */
+ detached_regcache *regcache;
+
+ /* The frame being unwound. */
+ struct frame_info *this_frame;
+};
- /* Check that the version number agrees with that we support. */
- if (descriptor.version != 1)
- error (_("Unsupported JIT protocol version in descriptor!"));
+/* 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;
- /* Put a breakpoint in the registration symbol. */
- create_jit_event_breakpoint (gdbarch, reg_addr);
+ priv = (struct jit_unwind_private *) cb->priv_data;
- /* If we've attached to a running program, we need to check the descriptor to
- register any functions that were already generated. */
- for (cur_entry_addr = descriptor.first_entry;
- cur_entry_addr != 0;
- cur_entry_addr = cur_entry.next_entry)
+ gdb_reg = gdbarch_dwarf2_reg_to_regnum (get_frame_arch (priv->this_frame),
+ dwarf_regnum);
+ if (gdb_reg == -1)
{
- jit_read_code_entry (gdbarch, cur_entry_addr, &cur_entry);
+ jit_debug_printf ("Could not recognize DWARF regnum %d", dwarf_regnum);
+ value->free (value);
+ return;
+ }
+
+ priv->regcache->raw_supply (gdb_reg, value->value);
+ value->free (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 = (struct jit_unwind_private *) 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 = ((struct gdb_reg_value *)
+ xmalloc (sizeof (struct gdb_reg_value) + size - 1));
+ value->defined = deprecated_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 = (struct jit_unwind_private *) cache;
+
+ gdb_assert (priv_data->regcache != NULL);
+ delete priv_data->regcache;
+ 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_unwind_private *priv_data;
+ struct gdb_unwind_callbacks callbacks;
+ struct gdb_reader_funcs *funcs;
- /* This hook may be called many times during setup, so make sure we don't
- add the same symbol file twice. */
- if (jit_find_objf_with_entry_addr (cur_entry_addr) != NULL)
- continue;
+ callbacks.reg_get = jit_unwind_reg_get_impl;
+ callbacks.reg_set = jit_unwind_reg_set_impl;
+ callbacks.target_read = jit_target_read_impl;
- jit_register_code (gdbarch, cur_entry_addr, &cur_entry);
+ if (loaded_jit_reader == NULL)
+ return 0;
+
+ funcs = loaded_jit_reader->functions;
+
+ gdb_assert (!*cache);
+
+ *cache = XCNEW (struct jit_unwind_private);
+ priv_data = (struct jit_unwind_private *) *cache;
+ /* Take a snapshot of current regcache. */
+ priv_data->regcache = new detached_regcache (get_frame_arch (this_frame),
+ true);
+ 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)
+ {
+ jit_debug_printf ("Successfully unwound frame using JIT reader.");
+ return 1;
}
+
+ jit_debug_printf ("Could not unwind frame using JIT reader.");
+
+ jit_dealloc_cache (this_frame, *cache);
+ *cache = NULL;
+
+ return 0;
}
-/* Exported routine to call when an inferior has been created. */
-void
-jit_inferior_created_hook (void)
+/* 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)
{
- jit_inferior_init (target_gdbarch);
+ struct jit_unwind_private priv;
+ struct gdb_frame_id frame_id;
+ struct gdb_reader_funcs *funcs;
+ struct gdb_unwind_callbacks callbacks;
+
+ priv.regcache = NULL;
+ priv.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 = &priv;
+
+ 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);
}
-/* Exported routine to call to re-set the jit breakpoints,
- e.g. when a program is rerun. */
+/* Pseudo unwinder function. Reads the previously fetched value for
+ the register from the cache. */
-void
-jit_breakpoint_re_set (void)
+static struct value *
+jit_frame_prev_register (struct frame_info *this_frame, void **cache, int reg)
{
- jit_inferior_init (target_gdbarch);
+ struct jit_unwind_private *priv = (struct jit_unwind_private *) *cache;
+ struct gdbarch *gdbarch;
+
+ if (priv == NULL)
+ return frame_unwind_got_optimized (this_frame, reg);
+
+ gdbarch = priv->regcache->arch ();
+ gdb_byte *buf = (gdb_byte *) alloca (register_size (gdbarch, reg));
+ enum register_status status = priv->regcache->cooked_read (reg, buf);
+
+ if (status == REG_VALID)
+ return frame_unwind_got_bytes (this_frame, reg, buf);
+ else
+ return frame_unwind_got_optimized (this_frame, reg);
}
-/* Wrapper to match the observer function pointer prototype. */
+/* Relay everything back to the unwinder registered by the JIT debug
+ info reader.*/
+
+static const struct frame_unwind jit_frame_unwind =
+{
+ "jit",
+ 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_inferior_created_observer (struct target_ops *objfile, int from_tty)
+jit_prepend_unwinder (struct gdbarch *gdbarch)
{
- jit_inferior_init (target_gdbarch);
+ struct jit_gdbarch_data_type *data;
+
+ data
+ = (struct jit_gdbarch_data_type *) gdbarch_data (gdbarch, jit_gdbarch_data);
+ if (!data->unwinder_registered)
+ {
+ frame_unwind_prepend_unwinder (gdbarch, &jit_frame_unwind);
+ data->unwinder_registered = 1;
+ }
}
-/* 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. */
+/* Register any already created translations. */
static void
-jit_inferior_exit_hook (int pid)
+jit_inferior_init (inferior *inf)
{
- struct objfile *objf;
- struct objfile *temp;
+ struct jit_descriptor descriptor;
+ struct jit_code_entry cur_entry;
+ CORE_ADDR cur_entry_addr;
+ struct gdbarch *gdbarch = inf->gdbarch;
+ program_space *pspace = inf->pspace;
+
+ jit_debug_printf ("called");
+
+ jit_prepend_unwinder (gdbarch);
- /* We need to reset the descriptor addr so that next time we load up the
- inferior we look for it again. */
- jit_descriptor_addr = 0;
+ jit_breakpoint_re_set_internal (gdbarch, pspace);
- ALL_OBJFILES_SAFE (objf, temp)
- if (objfile_data (objf, jit_objfile_data) != NULL)
- jit_unregister_code (objf);
+ for (objfile *jiter : pspace->objfiles ())
+ {
+ if (jiter->jiter_data == nullptr)
+ continue;
+
+ /* Read the descriptor so we can check the version number and load
+ any already JITed functions. */
+ if (!jit_read_descriptor (gdbarch, &descriptor, jiter))
+ continue;
+
+ /* Check that the version number agrees with that we support. */
+ if (descriptor.version != 1)
+ {
+ fprintf_unfiltered (gdb_stderr,
+ _("Unsupported JIT protocol version %ld "
+ "in descriptor (expected 1)\n"),
+ (long) descriptor.version);
+ continue;
+ }
+
+ /* If we've attached to a running program, we need to check the
+ descriptor to register any functions that were already
+ generated. */
+ for (cur_entry_addr = descriptor.first_entry;
+ cur_entry_addr != 0;
+ cur_entry_addr = cur_entry.next_entry)
+ {
+ jit_read_code_entry (gdbarch, cur_entry_addr, &cur_entry);
+
+ /* This hook may be called many times during setup, so make sure
+ we don't add the same symbol file twice. */
+ if (jit_find_objf_with_entry_addr (cur_entry_addr) != NULL)
+ continue;
+
+ jit_register_code (gdbarch, cur_entry_addr, &cur_entry);
+ }
+ }
+}
+
+/* Looks for the descriptor and registration symbols and breakpoints
+ the registration function. If it finds both, it registers all the
+ already JITed code. If it has already found the symbols, then it
+ doesn't try again. */
+
+static void
+jit_inferior_created_hook (inferior *inf)
+{
+ jit_inferior_init (inf);
+}
+
+/* Exported routine to call to re-set the jit breakpoints,
+ e.g. when a program is rerun. */
+
+void
+jit_breakpoint_re_set (void)
+{
+ jit_breakpoint_re_set_internal (target_gdbarch (), current_program_space);
+}
+
+/* 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. */
+
+static void
+jit_inferior_exit_hook (struct inferior *inf)
+{
+ for (objfile *objf : current_program_space->objfiles_safe ())
+ {
+ if (objf->jited_data != nullptr && objf->jited_data->addr != 0)
+ objf->unlink ();
+ }
}
void
-jit_event_handler (struct gdbarch *gdbarch)
+jit_event_handler (gdbarch *gdbarch, objfile *jiter)
{
struct jit_descriptor descriptor;
- struct jit_code_entry code_entry;
- CORE_ADDR entry_addr;
- struct objfile *objf;
+
+ /* If we get a JIT breakpoint event for this objfile, it is necessarily a
+ JITer. */
+ gdb_assert (jiter->jiter_data != nullptr);
/* Read the descriptor from remote memory. */
- jit_read_descriptor (gdbarch, &descriptor);
- entry_addr = descriptor.relevant_entry;
+ if (!jit_read_descriptor (gdbarch, &descriptor, jiter))
+ return;
+ CORE_ADDR entry_addr = descriptor.relevant_entry;
- /* Do the corresponding action. */
+ /* Do the corresponding action. */
switch (descriptor.action_flag)
{
case JIT_NOACTION:
break;
+
case JIT_REGISTER:
- jit_read_code_entry (gdbarch, entry_addr, &code_entry);
- jit_register_code (gdbarch, entry_addr, &code_entry);
- break;
+ {
+ jit_code_entry code_entry;
+ jit_read_code_entry (gdbarch, entry_addr, &code_entry);
+ jit_register_code (gdbarch, entry_addr, &code_entry);
+ break;
+ }
+
case JIT_UNREGISTER:
- objf = jit_find_objf_with_entry_addr (entry_addr);
- if (objf == NULL)
- printf_unfiltered (_("Unable to find JITed code entry at address: %s\n"),
- paddress (gdbarch, entry_addr));
- else
- jit_unregister_code (objf);
+ {
+ objfile *jited = jit_find_objf_with_entry_addr (entry_addr);
+ if (jited == nullptr)
+ fprintf_unfiltered (gdb_stderr,
+ _("Unable to find JITed code "
+ "entry at address: %s\n"),
+ paddress (gdbarch, entry_addr));
+ else
+ jited->unlink ();
+
+ break;
+ }
- break;
default:
error (_("Unknown action_flag value in JIT descriptor!"));
break;
}
}
-/* Provide a prototype to silence -Wmissing-prototypes. */
+/* 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 =
+ XOBNEW (obstack, struct jit_gdbarch_data_type);
-extern void _initialize_jit (void);
+ data->unwinder_registered = 0;
+ return data;
+}
+
+void _initialize_jit ();
void
-_initialize_jit (void)
+_initialize_jit ()
{
- observer_attach_inferior_created (jit_inferior_created_observer);
- observer_attach_inferior_exit (jit_inferior_exit_hook);
- jit_objfile_data = register_objfile_data ();
+ jit_reader_dir = relocate_gdb_directory (JIT_READER_DIR,
+ JIT_READER_DIR_RELOCATABLE);
+ add_setshow_boolean_cmd ("jit", class_maintenance, &jit_debug,
+ _("Set JIT debugging."),
+ _("Show JIT debugging."),
+ _("When set, JIT debugging is enabled."),
+ NULL,
+ show_jit_debug,
+ &setdebuglist, &showdebuglist);
+
+ add_cmd ("jit", class_maintenance, maint_info_jit_cmd,
+ _("Print information about JIT-ed code objects."),
+ &maintenanceinfolist);
+
+ gdb::observers::inferior_created.attach (jit_inferior_created_hook, "jit");
+ gdb::observers::inferior_execd.attach (jit_inferior_created_hook, "jit");
+ gdb::observers::inferior_exit.attach (jit_inferior_exit_hook, "jit");
+ gdb::observers::breakpoint_deleted.attach (jit_breakpoint_deleted, "jit");
+
+ jit_gdbarch_data = gdbarch_data_register_pre_init (jit_gdbarch_data_init);
+ if (is_dl_available ())
+ {
+ struct cmd_list_element *c;
+
+ c = 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."));
+ set_cmd_completer (c, filename_completer);
+
+ c = add_com ("jit-reader-unload", no_class,
+ jit_reader_unload_command, _("\
+Unload the currently loaded JIT debug info reader.\n\
+Usage: jit-reader-unload\n\n\
+Do \"help jit-reader-load\" for info on loading debug info readers."));
+ set_cmd_completer (c, noop_completer);
+ }
}
projects / binutils-gdb.git / blobdiff