Fix ld --gc-section segfault with ARMv8-M entry function in absolute section

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

diff --git a/ld/ldexp.h b/ld/ldexp.h
index 6c94be2eaba3fc80d81b686b563c961648d3a06c..0da39810aa0f3d69c92932beffcbbb0e89c3a4ca 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, 2011 Free Software Foundation, Inc.
+   Copyright (C) 1991-2016 Free Software Foundation, Inc.
 
    This file is part of the GNU Binutils.
 
@@ -46,7 +45,8 @@ enum node_tree_enum {
 typedef struct {
   int node_code;
   unsigned int lineno;
-  enum  node_tree_enum node_class;
+  const char *filename;
+  enum node_tree_enum node_class;
 } node_type;
 
 typedef union etree_union {
@@ -66,6 +66,7 @@ typedef union etree_union {
     node_type type;
     const char *dst;
     union etree_union *src;
+    bfd_boolean defsym;
     bfd_boolean hidden;
   } assign;
   struct {
@@ -93,10 +94,19 @@ 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,
+  /* During assignment of symbol values when relaxation in progress.  */
+  lang_assigning_phase_enum,
+  /* Final assignment of symbol values.  */
   lang_final_phase_enum
 } lang_phase_type;
 
@@ -129,11 +139,22 @@ 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;
+
   /* Working results.  */
   etree_value_type result;
   bfd_vma dot;
-  /* Set if an expression contains DEFINED().  */
-  bfd_boolean uses_defined;
 
   /* Current dot and section passed to ldexp folder.  */
   bfd_vma *dotp;
@@ -143,7 +164,7 @@ struct ldexp_control {
   struct {
     enum phase_enum phase;
 
-    bfd_vma base, min_base, relro_end, end, pagesize, maxpagesize;
+    bfd_vma base, relro_offset, relro_end, end, pagesize, maxpagesize;
 
     enum relro_enum relro;
 
@@ -190,8 +211,10 @@ 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
@@ -206,5 +229,8 @@ 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