[v3,07/19] libctf: implementation definitions related to file creation

Message ID 20190524201046.427681-8-nick.alcock@oracle.com
State New
Headers show
Series
  • libctf, and CTF support for objdump and readelf
Related show

Commit Message

Nick Alcock May 24, 2019, 8:10 p.m.
We now enter a series of commits that are sufficiently tangled that
avoiding forward definitions is almost impossible: no attempt is made to
make individual commits compilable (which is why the build system does
not reference any of them yet): the only important thing is that they
should form something like conceptual groups.

But first, some definitions, including the core ctf_file_t itself.  Uses
of these definitions will be introduced in later commits.

Changes from v2:
 - Add ctf_file_t.ctf_archive.

Changes from v1:
 - Correct erroneous license (GPLv2+ -> v3+) and reset copyright years.
 - Drop LCTF_MMAP: seemingly not supportable with bfd (which is
   unfortunate)
 - Move some of the prototype introduction in ctf-impl.h to later in the
   series

libctf/
	* ctf-impl.h: New definitions and declarations for type creation
	and lookup.
---
 libctf/ctf-impl.h | 214 ++++++++++++++++++++++++++++++++++++++++++++++
 1 file changed, 214 insertions(+)

-- 
2.21.0.237.gd0cfaa883d

Patch

diff --git a/libctf/ctf-impl.h b/libctf/ctf-impl.h
index 31207cd5d7..ef4221a8a4 100644
--- a/libctf/ctf-impl.h
+++ b/libctf/ctf-impl.h
@@ -63,12 +63,210 @@  extern "C"
 typedef struct ctf_fixed_hash ctf_hash_t; /* Private to ctf-hash.c.  */
 typedef struct ctf_dynhash ctf_dynhash_t; /* Private to ctf-hash.c.  */
 
+typedef struct ctf_strs
+{
+  const char *cts_strs;		/* Base address of string table.  */
+  size_t cts_len;		/* Size of string table in bytes.  */
+} ctf_strs_t;
+
+typedef struct ctf_dmodel
+{
+  const char *ctd_name;		/* Data model name.  */
+  int ctd_code;			/* Data model code.  */
+  size_t ctd_pointer;		/* Size of void * in bytes.  */
+  size_t ctd_char;		/* Size of char in bytes.  */
+  size_t ctd_short;		/* Size of short in bytes.  */
+  size_t ctd_int;		/* Size of int in bytes.  */
+  size_t ctd_long;		/* Size of long in bytes.  */
+} ctf_dmodel_t;
+
+typedef struct ctf_lookup
+{
+  const char *ctl_prefix;	/* String prefix for this lookup.  */
+  size_t ctl_len;		/* Length of prefix string in bytes.  */
+  ctf_hash_t *ctl_hash;		/* Pointer to hash table for lookup.  */
+} ctf_lookup_t;
+
+typedef struct ctf_fileops
+{
+  uint32_t (*ctfo_get_kind) (uint32_t);
+  uint32_t (*ctfo_get_root) (uint32_t);
+  uint32_t (*ctfo_get_vlen) (uint32_t);
+  ssize_t (*ctfo_get_ctt_size) (const ctf_file_t *, const ctf_type_t *,
+				ssize_t *, ssize_t *);
+  ssize_t (*ctfo_get_vbytes) (unsigned short, ssize_t, size_t);
+} ctf_fileops_t;
+
 typedef struct ctf_list
 {
   struct ctf_list *l_prev;	/* Previous pointer or tail pointer.  */
   struct ctf_list *l_next;	/* Next pointer or head pointer.  */
 } ctf_list_t;
 
+typedef enum
+  {
+   CTF_PREC_BASE,
+   CTF_PREC_POINTER,
+   CTF_PREC_ARRAY,
+   CTF_PREC_FUNCTION,
+   CTF_PREC_MAX
+  } ctf_decl_prec_t;
+
+typedef struct ctf_decl_node
+{
+  ctf_list_t cd_list;		/* Linked list pointers.  */
+  ctf_id_t cd_type;		/* Type identifier.  */
+  uint32_t cd_kind;		/* Type kind.  */
+  uint32_t cd_n;		/* Type dimension if array.  */
+} ctf_decl_node_t;
+
+typedef struct ctf_decl
+{
+  ctf_list_t cd_nodes[CTF_PREC_MAX]; /* Declaration node stacks.  */
+  int cd_order[CTF_PREC_MAX];	     /* Storage order of decls.  */
+  ctf_decl_prec_t cd_qualp;	     /* Qualifier precision.  */
+  ctf_decl_prec_t cd_ordp;	     /* Ordered precision.  */
+  char *cd_buf;			     /* Buffer for output.  */
+  int cd_err;			     /* Saved error value.  */
+  int cd_enomem;		     /* Nonzero if OOM during printing.  */
+} ctf_decl_t;
+
+typedef struct ctf_dmdef
+{
+  ctf_list_t dmd_list;		/* List forward/back pointers.  */
+  char *dmd_name;		/* Name of this member.  */
+  ctf_id_t dmd_type;		/* Type of this member (for sou).  */
+  unsigned long dmd_offset;	/* Offset of this member in bits (for sou).  */
+  int dmd_value;		/* Value of this member (for enum).  */
+} ctf_dmdef_t;
+
+typedef struct ctf_dtdef
+{
+  ctf_list_t dtd_list;		/* List forward/back pointers.  */
+  char *dtd_name;		/* Name associated with definition (if any).  */
+  ctf_id_t dtd_type;		/* Type identifier for this definition.  */
+  ctf_type_t dtd_data;		/* Type node (see <ctf.h>).  */
+  union
+  {
+    ctf_list_t dtu_members;	/* struct, union, or enum */
+    ctf_arinfo_t dtu_arr;	/* array */
+    ctf_encoding_t dtu_enc;	/* integer or float */
+    ctf_id_t *dtu_argv;		/* function */
+    ctf_slice_t dtu_slice;	/* slice */
+  } dtd_u;
+} ctf_dtdef_t;
+
+typedef struct ctf_dvdef
+{
+  ctf_list_t dvd_list;		/* List forward/back pointers.  */
+  char *dvd_name;		/* Name associated with variable.  */
+  ctf_id_t dvd_type;		/* Type of variable.  */
+  unsigned long dvd_snapshots;	/* Snapshot count when inserted.  */
+} ctf_dvdef_t;
+
+typedef struct ctf_bundle
+{
+  ctf_file_t *ctb_file;		/* CTF container handle.  */
+  ctf_id_t ctb_type;		/* CTF type identifier.  */
+  ctf_dtdef_t *ctb_dtd;		/* CTF dynamic type definition (if any).  */
+} ctf_bundle_t;
+
+/* The ctf_file is the structure used to represent a CTF container to library
+   clients, who see it only as an opaque pointer.  Modifications can therefore
+   be made freely to this structure without regard to client versioning.  The
+   ctf_file_t typedef appears in <ctf-api.h> and declares a forward tag.
+
+   NOTE: ctf_update() requires that everything inside of ctf_file either be an
+   immediate value, a pointer to dynamically allocated data *outside* of the
+   ctf_file itself, or a pointer to statically allocated data.  If you add a
+   pointer to ctf_file that points to something within the ctf_file itself,
+   you must make corresponding changes to ctf_update().  */
+
+struct ctf_file
+{
+  const ctf_fileops_t *ctf_fileops; /* Version-specific file operations.  */
+  ctf_sect_t ctf_data;		    /* CTF data from object file.  */
+  ctf_sect_t ctf_symtab;	    /* Symbol table from object file.  */
+  ctf_sect_t ctf_strtab;	    /* String table from object file.  */
+  ctf_hash_t *ctf_structs;	    /* Hash table of struct types.  */
+  ctf_hash_t *ctf_unions;	    /* Hash table of union types.  */
+  ctf_hash_t *ctf_enums;	    /* Hash table of enum types.  */
+  ctf_hash_t *ctf_names;	    /* Hash table of remaining type names.  */
+  ctf_lookup_t ctf_lookups[5];	    /* Pointers to hashes for name lookup.  */
+  ctf_strs_t ctf_str[2];	    /* Array of string table base and bounds.  */
+  const unsigned char *ctf_base;  /* Base of CTF header + uncompressed buffer.  */
+  const unsigned char *ctf_buf;	  /* Uncompressed CTF data buffer.  */
+  size_t ctf_size;		  /* Size of CTF header + uncompressed data.  */
+  uint32_t *ctf_sxlate;		  /* Translation table for symtab entries.  */
+  unsigned long ctf_nsyms;	  /* Number of entries in symtab xlate table.  */
+  uint32_t *ctf_txlate;		  /* Translation table for type IDs.  */
+  uint32_t *ctf_ptrtab;		  /* Translation table for pointer-to lookups.  */
+  struct ctf_varent *ctf_vars;	  /* Sorted variable->type mapping.  */
+  unsigned long ctf_nvars;	  /* Number of variables in ctf_vars.  */
+  unsigned long ctf_typemax;	  /* Maximum valid type ID number.  */
+  const ctf_dmodel_t *ctf_dmodel; /* Data model pointer (see above).  */
+  struct ctf_file *ctf_parent;	  /* Parent CTF container (if any).  */
+  const char *ctf_parlabel;	  /* Label in parent container (if any).  */
+  const char *ctf_parname;	  /* Basename of parent (if any).  */
+  char *ctf_dynparname;		  /* Dynamically allocated name of parent.  */
+  uint32_t ctf_parmax;		  /* Highest type ID of a parent type.  */
+  uint32_t ctf_refcnt;		  /* Reference count (for parent links).  */
+  uint32_t ctf_flags;		  /* Libctf flags (see below).  */
+  int ctf_errno;		  /* Error code for most recent error.  */
+  int ctf_version;		  /* CTF data version.  */
+  ctf_dynhash_t *ctf_dthash;	  /* Hash of dynamic type definitions.  */
+  ctf_dynhash_t *ctf_dtbyname;	  /* DTDs, indexed by name.  */
+  ctf_list_t ctf_dtdefs;	  /* List of dynamic type definitions.  */
+  ctf_dynhash_t *ctf_dvhash;	  /* Hash of dynamic variable mappings.  */
+  ctf_list_t ctf_dvdefs;	  /* List of dynamic variable definitions.  */
+  size_t ctf_dtvstrlen;		  /* Total length of dynamic type+var strings.  */
+  unsigned long ctf_dtnextid;	  /* Next dynamic type id to assign.  */
+  unsigned long ctf_dtoldid;	  /* Oldest id that has been committed.  */
+  unsigned long ctf_snapshots;	  /* ctf_snapshot() plus ctf_update() count.  */
+  unsigned long ctf_snapshot_lu;  /* ctf_snapshot() call count at last update.  */
+  ctf_archive_t *ctf_archive;	  /* Archive this ctf_file_t came from.  */
+  char *ctf_tmp_typeslice;	  /* Storage for slicing up type names.  */
+  size_t ctf_tmp_typeslicelen;	  /* Size of the typeslice.  */
+  void *ctf_specific;		  /* Data for ctf_get/setspecific().  */
+};
+
+/* Return x rounded up to an alignment boundary.
+   eg, P2ROUNDUP(0x1234, 0x100) == 0x1300 (0x13*align)
+   eg, P2ROUNDUP(0x5600, 0x100) == 0x5600 (0x56*align)  */
+#define P2ROUNDUP(x, align)		(-(-(x) & -(align)))
+
+/* * If an offs is not aligned already then round it up and align it. */
+#define LCTF_ALIGN_OFFS(offs, align) ((offs + (align - 1)) & ~(align - 1))
+
+#define LCTF_TYPE_ISPARENT(fp, id) ((id) <= fp->ctf_parmax)
+#define LCTF_TYPE_ISCHILD(fp, id) ((id) > fp->ctf_parmax)
+#define LCTF_TYPE_TO_INDEX(fp, id) ((id) & (fp->ctf_parmax))
+#define LCTF_INDEX_TO_TYPE(fp, id, child) (child ? ((id) | (fp->ctf_parmax+1)) : \
+					   (id))
+
+#define LCTF_INDEX_TO_TYPEPTR(fp, i) \
+  ((ctf_type_t *)((uintptr_t)(fp)->ctf_buf + (fp)->ctf_txlate[(i)]))
+
+#define LCTF_INFO_KIND(fp, info)	((fp)->ctf_fileops->ctfo_get_kind(info))
+#define LCTF_INFO_ISROOT(fp, info)	((fp)->ctf_fileops->ctfo_get_root(info))
+#define LCTF_INFO_VLEN(fp, info)	((fp)->ctf_fileops->ctfo_get_vlen(info))
+#define LCTF_VBYTES(fp, kind, size, vlen) \
+  ((fp)->ctf_fileops->ctfo_get_vbytes(kind, size, vlen))
+
+static inline ssize_t ctf_get_ctt_size (const ctf_file_t *fp,
+					const ctf_type_t *tp,
+					ssize_t *sizep,
+					ssize_t *incrementp)
+{
+  return (fp->ctf_fileops->ctfo_get_ctt_size (fp, tp, sizep, incrementp));
+}
+
+#define LCTF_CHILD	0x0001	/* CTF container is a child */
+#define LCTF_RDWR	0x0002	/* CTF container is writable */
+#define LCTF_DIRTY	0x0004	/* CTF container has been modified */
+
+extern const ctf_type_t *ctf_lookup_by_id (ctf_file_t **, ctf_id_t);
+
 typedef unsigned int (*ctf_hash_fun) (const void *ptr);
 extern unsigned int ctf_hash_integer (const void *ptr);
 extern unsigned int ctf_hash_string (const void *ptr);
@@ -100,6 +298,15 @@  extern void ctf_list_append (ctf_list_t *, void *);
 extern void ctf_list_prepend (ctf_list_t *, void *);
 extern void ctf_list_delete (ctf_list_t *, void *);
 
+extern void ctf_dtd_insert (ctf_file_t *, ctf_dtdef_t *);
+extern void ctf_dtd_delete (ctf_file_t *, ctf_dtdef_t *);
+extern ctf_dtdef_t *ctf_dtd_lookup (const ctf_file_t *, ctf_id_t);
+extern ctf_dtdef_t *ctf_dynamic_type (const ctf_file_t *, ctf_id_t);
+
+extern void ctf_dvd_insert (ctf_file_t *, ctf_dvdef_t *);
+extern void ctf_dvd_delete (ctf_file_t *, ctf_dvdef_t *);
+extern ctf_dvdef_t *ctf_dvd_lookup (const ctf_file_t *, const char *);
+
 extern const char *ctf_strraw (ctf_file_t *, uint32_t);
 extern const char *ctf_strptr (ctf_file_t *, uint32_t);
 
@@ -125,12 +332,19 @@  extern char *ctf_strdup (const char *);
 extern char *ctf_str_append (char *, const char *);
 extern const char *ctf_strerror (int);
 
+extern ctf_id_t ctf_type_resolve_unsliced (ctf_file_t *, ctf_id_t);
+extern int ctf_type_kind_unsliced (ctf_file_t *, ctf_id_t);
+
 _libctf_printflike_ (1, 2)
 extern void ctf_dprintf (const char *, ...);
 extern void libctf_init_debug (void);
 
 extern Elf64_Sym *ctf_sym_to_elf64 (const Elf32_Sym *src, Elf64_Sym *dst);
 
+/* Variables, all underscore-prepended. */
+
+extern const char _CTF_NULLSTR[];	/* empty string */
+
 extern int _libctf_debug;	/* debugging messages enabled */
 
 #ifdef	__cplusplus