Multi-target: NEWS and user manual

[deliverable/binutils-gdb.git] / ld / ldexp.h

diff --git a/ld/ldexp.h b/ld/ldexp.h
index 5c8bad22d8539f04e3e8e1de35bcf459b33d951c..717e839bd41131703029f2a0386ceee7e941d2df 100644 (file)
--- a/ld/ldexp.h
+++ b/ld/ldexp.h
@@ -1,6 +1,5 @@
 /* ldexp.h -
-   Copyright 1991, 1992, 1993, 1994, 1995, 1998, 1999, 2000, 2001, 2002,
-   2003, 2004, 2005, 2007 Free Software Foundation, Inc.
+   Copyright (C) 1991-2020 Free Software Foundation, Inc.
 
    This file is part of the GNU Binutils.
 
@@ -30,21 +29,24 @@ typedef struct {
   bfd_boolean valid_p;
 } etree_value_type;
 
+enum node_tree_enum {
+  etree_binary,
+  etree_trinary,
+  etree_unary,
+  etree_name,
+  etree_assign,
+  etree_provide,
+  etree_provided,
+  etree_value,
+  etree_assert,
+  etree_rel
+};
+
 typedef struct {
   int node_code;
   unsigned int lineno;
-  enum {
-    etree_binary,
-    etree_trinary,
-    etree_unary,
-    etree_name,
-    etree_assign,
-    etree_provide,
-    etree_provided,
-    etree_value,
-    etree_assert,
-    etree_rel
-  } node_class;
+  const char *filename;
+  enum node_tree_enum node_class;
 } node_type;
 
 typedef union etree_union {
@@ -91,13 +93,57 @@ typedef union etree_union {
   } assert_s;
 } etree_type;
 
-typedef enum {
+/* Expression evaluation control.  */
+typedef enum
+{
+  /* Parsing linker script.  Will only return "valid" for expressions
+     that evaluate to a constant.  */
   lang_first_phase_enum,
+  /* Prior to section sizing.  */
   lang_mark_phase_enum,
+  /* During section sizing.  */
   lang_allocating_phase_enum,
-  lang_final_phase_enum
+  /* During assignment of symbol values when relaxation in progress.  */
+  lang_assigning_phase_enum,
+  /* Final assignment of symbol values.  */
+  lang_final_phase_enum,
+  /* Run after symbol values have been fixed, for lang_map.  */
+  lang_fixed_phase_enum
 } lang_phase_type;
 
+union lang_statement_union;
+
+enum phase_enum {
+  /* We step through the first four states here as we see the
+     associated linker script tokens.  */
+  exp_seg_none,
+  exp_seg_align_seen,
+  exp_seg_relro_seen,
+  exp_seg_end_seen,
+  /* The last three states are final, and affect the value returned
+     by XXX_SEGMENT_ALIGN.  */
+  exp_seg_relro_adjust,
+  exp_seg_adjust,
+  exp_seg_done
+};
+
+enum relro_enum {
+  exp_seg_relro_none,
+  exp_seg_relro_start,
+  exp_seg_relro_end,
+};
+
+typedef struct {
+  enum phase_enum phase;
+
+  bfd_vma base, relro_offset, relro_end, end, pagesize, maxpagesize;
+
+  enum relro_enum relro;
+
+  union lang_statement_union *relro_start_stat;
+  union lang_statement_union *relro_end_stat;
+} seg_align_type;
+
 struct ldexp_control {
   /* Modify expression evaluation depending on this.  */
   lang_phase_type phase;
@@ -105,6 +151,24 @@ struct ldexp_control {
   /* Principally used for diagnostics.  */
   bfd_boolean assigning_to_dot;
 
+  /* Set if the current expression used "dot", SEGMENT_START or
+     ORIGIN, but not ABSOLUTE or combined symbols in a way that forces
+     an absolute result.  Used in tracking symbols assigned from dot
+     outside of output section statements, in order to later convert
+     them from absolute.  */
+  bfd_boolean rel_from_abs;
+
+  /* If evaluating an assignment, the destination.  Cleared if an
+     etree_name NAME matches this, to signal a self-assignment.
+     Note that an etree_name DEFINED does not clear this field, nor
+     does the false branch of a trinary expression.  */
+  const char *assign_name;
+
+  /* If evaluating an assignment, the source if it is an expression
+     referencing single etree_name NAME, or a trinary expression where
+     the true branch references a single etree_name NAME.  */
+  struct bfd_link_hash_entry *assign_src;
+
   /* Working results.  */
   etree_value_type result;
   bfd_vma dot;
@@ -114,18 +178,7 @@ struct ldexp_control {
   asection *section;
 
   /* State machine and results for DATASEG.  */
-  struct {
-    enum {
-      exp_dataseg_none,
-      exp_dataseg_align_seen,
-      exp_dataseg_relro_seen,
-      exp_dataseg_end_seen,
-      exp_dataseg_relro_adjust,
-      exp_dataseg_adjust
-    } phase;
-
-    bfd_vma base, min_base, relro_end, end, pagesize, maxpagesize;
-  } dataseg;
+  seg_align_type dataseg;
 };
 
 extern struct ldexp_control expld;
@@ -156,6 +209,8 @@ etree_type *exp_relop
   (asection *, bfd_vma);
 void exp_fold_tree
   (etree_type *, asection *, bfd_vma *);
+void exp_fold_tree_no_dot
+  (etree_type *);
 etree_type *exp_binop
   (int, etree_type *, etree_type *);
 etree_type *exp_trinop
@@ -164,8 +219,10 @@ etree_type *exp_unop
   (int, etree_type *);
 etree_type *exp_nameop
   (int, const char *);
-etree_type *exp_assop
-  (int, const char *, etree_type *);
+etree_type *exp_assign
+  (const char *, etree_type *, bfd_boolean);
+etree_type *exp_defsym
+  (const char *, etree_type *);
 etree_type *exp_provide
   (const char *, etree_type *, bfd_boolean);
 etree_type *exp_assert
@@ -174,11 +231,14 @@ void exp_print_tree
   (etree_type *);
 bfd_vma exp_get_vma
   (etree_type *, bfd_vma, char *);
-int exp_get_value_int
-  (etree_type *, int, char *);
+int exp_get_power
+  (etree_type *, char *);
 fill_type *exp_get_fill
   (etree_type *, fill_type *, char *);
 bfd_vma exp_get_abs_int
   (etree_type *, int, char *);
+void ldexp_init (void);
+void ldexp_finalize_syms (void);
+void ldexp_finish (void);
 
 #endif