X-Git-Url: http://git.ipfire.org/?a=blobdiff_plain;f=gcc%2Fdwarf2asm.c;h=488e54b72ec659790591a30137a5577b290e07cc;hb=ac71c66c0f8f737601d34ee7eb813cdfacf83455;hp=1bbadc52b61e4a9154cbdd9a9a6156229b9c617c;hpb=67ce556b47830dd825524e8370969b814c355216;p=thirdparty%2Fgcc.git

diff --git a/gcc/dwarf2asm.c b/gcc/dwarf2asm.c
index 1bbadc52b61e..488e54b72ec6 100644
--- a/gcc/dwarf2asm.c
+++ b/gcc/dwarf2asm.c
@@ -1,11 +1,11 @@
 /* Dwarf2 assembler output helper routines.
-   Copyright (C) 2001, 2002, 2003, 2004, 2005 Free Software Foundation, Inc.
+   Copyright (C) 2001-2019 Free Software Foundation, Inc.
 
 This file is part of GCC.
 
 GCC is free software; you can redistribute it and/or modify it under
 the terms of the GNU General Public License as published by the Free
-Software Foundation; either version 2, or (at your option) any later
+Software Foundation; either version 3, or (at your option) any later
 version.
 
 GCC is distributed in the hope that it will be useful, but WITHOUT ANY
@@ -14,30 +14,29 @@ FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License
 for more details.
 
 You should have received a copy of the GNU General Public License
-along with GCC; see the file COPYING.  If not, write to the Free
-Software Foundation, 51 Franklin Street, Fifth Floor, Boston, MA
-02110-1301, USA.  */
+along with GCC; see the file COPYING3.  If not see
+<http://www.gnu.org/licenses/>.  */
 
 
 #include "config.h"
 #include "system.h"
 #include "coretypes.h"
-#include "tm.h"
-#include "flags.h"
-#include "tree.h"
+#include "target.h"
 #include "rtl.h"
+#include "tree.h"
+#include "memmodel.h"
+#include "tm_p.h"
+#include "stringpool.h"
+#include "varasm.h"
 #include "output.h"
-#include "target.h"
 #include "dwarf2asm.h"
 #include "dwarf2.h"
-#include "splay-tree.h"
-#include "ggc.h"
-#include "tm_p.h"
-
+#include "function.h"
+#include "emit-rtl.h"
+#include "fold-const.h"
 
-/* How to start an assembler comment.  */
-#ifndef ASM_COMMENT_START
-#define ASM_COMMENT_START ";#"
+#ifndef XCOFF_DEBUGGING_INFO
+#define XCOFF_DEBUGGING_INFO 0
 #endif
 
 
@@ -52,8 +51,8 @@ dw2_assemble_integer (int size, rtx x)
   if (op)
     {
       fputs (op, asm_out_file);
-      if (GET_CODE (x) == CONST_INT)
-	fprintf (asm_out_file, HOST_WIDE_INT_PRINT_HEX, INTVAL (x));
+      if (CONST_INT_P (x))
+	fprint_whex (asm_out_file, (unsigned HOST_WIDE_INT) INTVAL (x));
       else
 	output_addr_const (asm_out_file, x);
     }
@@ -62,27 +61,62 @@ dw2_assemble_integer (int size, rtx x)
 }
 
 
-/* Output an immediate constant in a given size.  */
+/* Output a value of a given size in target byte order.  */
+
+void
+dw2_asm_output_data_raw (int size, unsigned HOST_WIDE_INT value)
+{
+  unsigned char bytes[8];
+  int i;
+
+  for (i = 0; i < 8; ++i)
+    {
+      bytes[i] = value & 0xff;
+      value >>= 8;
+    }
+
+  if (BYTES_BIG_ENDIAN)
+    {
+      for (i = size - 1; i > 0; --i)
+	fprintf (asm_out_file, "%#x,", bytes[i]);
+      fprintf (asm_out_file, "%#x", bytes[0]);
+    }
+  else
+    {
+      for (i = 0; i < size - 1; ++i)
+	fprintf (asm_out_file, "%#x,", bytes[i]);
+      fprintf (asm_out_file, "%#x", bytes[i]);
+    }
+}
+
+/* Output an immediate constant in a given SIZE in bytes.  */
 
 void
 dw2_asm_output_data (int size, unsigned HOST_WIDE_INT value,
 		     const char *comment, ...)
 {
   va_list ap;
+  const char *op = integer_asm_op (size, FALSE);
 
   va_start (ap, comment);
 
   if (size * 8 < HOST_BITS_PER_WIDE_INT)
-    value &= ~(~(unsigned HOST_WIDE_INT) 0 << (size * 8));
+    value &= ~(HOST_WIDE_INT_M1U << (size * 8));
 
-  dw2_assemble_integer (size, GEN_INT (value));
+  if (op)
+    {
+      fputs (op, asm_out_file);
+      fprint_whex (asm_out_file, value);
+    }
+  else
+    assemble_integer (GEN_INT (value), size, BITS_PER_UNIT, 1);
 
   if (flag_debug_asm && comment)
     {
-      fprintf (asm_out_file, "\t%s ", ASM_COMMENT_START);
+      fputs ("\t" ASM_COMMENT_START " ", asm_out_file);
       vfprintf (asm_out_file, comment, ap);
     }
-  fputc ('\n', asm_out_file);
+  putc ('\n', asm_out_file);
 
   va_end (ap);
 }
@@ -119,14 +153,41 @@ dw2_asm_output_delta (int size, const char *lab1, const char *lab2,
   va_end (ap);
 }
 
-/* Output a section-relative reference to a label.  In general this
-   can only be done for debugging symbols.  E.g. on most targets with
-   the GNU linker, this is accomplished with a direct reference and
-   the knowledge that the debugging section will be placed at VMA 0.
-   Some targets have special relocations for this that we must use.  */
+#ifdef ASM_OUTPUT_DWARF_VMS_DELTA
+/* Output the difference between two symbols in instruction units
+   in a given size.  */
+
+void
+dw2_asm_output_vms_delta (int size ATTRIBUTE_UNUSED,
+			  const char *lab1, const char *lab2,
+			  const char *comment, ...)
+{
+  va_list ap;
+
+  va_start (ap, comment);
+
+  ASM_OUTPUT_DWARF_VMS_DELTA (asm_out_file, size, lab1, lab2);
+  if (flag_debug_asm && comment)
+    {
+      fprintf (asm_out_file, "\t%s ", ASM_COMMENT_START);
+      vfprintf (asm_out_file, comment, ap);
+    }
+  fputc ('\n', asm_out_file);
+
+  va_end (ap);
+}
+#endif
+
+/* Output a section-relative reference to a LABEL, which was placed in
+   BASE.  In general this can only be done for debugging symbols.
+   E.g. on most targets with the GNU linker, this is accomplished with
+   a direct reference and the knowledge that the debugging section
+   will be placed at VMA 0.  Some targets have special relocations for
+   this that we must use.  */
 
 void
 dw2_asm_output_offset (int size, const char *label,
+		       section *base ATTRIBUTE_UNUSED,
 		       const char *comment, ...)
 {
   va_list ap;
@@ -134,7 +195,7 @@ dw2_asm_output_offset (int size, const char *label,
   va_start (ap, comment);
 
 #ifdef ASM_OUTPUT_DWARF_OFFSET
-  ASM_OUTPUT_DWARF_OFFSET (asm_out_file, size, label);
+  ASM_OUTPUT_DWARF_OFFSET (asm_out_file, size, label, 0, base);
 #else
   dw2_assemble_integer (size, gen_rtx_SYMBOL_REF (Pmode, label));
 #endif
@@ -149,6 +210,33 @@ dw2_asm_output_offset (int size, const char *label,
   va_end (ap);
 }
 
+void
+dw2_asm_output_offset (int size, const char *label, HOST_WIDE_INT offset,
+		       section *base ATTRIBUTE_UNUSED,
+		       const char *comment, ...)
+{
+  va_list ap;
+
+  va_start (ap, comment);
+
+#ifdef ASM_OUTPUT_DWARF_OFFSET
+  ASM_OUTPUT_DWARF_OFFSET (asm_out_file, size, label, offset, base);
+#else
+  dw2_assemble_integer (size, gen_rtx_PLUS (Pmode,
+					    gen_rtx_SYMBOL_REF (Pmode, label),
+					    gen_int_mode (offset, Pmode)));
+#endif
+
+  if (flag_debug_asm && comment)
+    {
+      fprintf (asm_out_file, "\t%s ", ASM_COMMENT_START);
+      vfprintf (asm_out_file, comment, ap);
+    }
+  fputc ('\n', asm_out_file);
+
+  va_end (ap);
+}
+
 #if 0
 
 /* Output a self-relative reference to a label, possibly in a
@@ -233,7 +321,7 @@ dw2_asm_output_addr_rtx (int size, rtx addr,
    If COMMENT is not NULL and comments in the debug information
    have been requested by the user, append the given COMMENT
    to the generated output.  */
-   
+
 void
 dw2_asm_output_nstring (const char *str, size_t orig_len,
 			const char *comment, ...)
@@ -250,13 +338,19 @@ dw2_asm_output_nstring (const char *str, size_t orig_len,
 
   if (flag_debug_asm && comment)
     {
-      fputs ("\t.ascii \"", asm_out_file);
+      if (XCOFF_DEBUGGING_INFO)
+	fputs ("\t.byte \"", asm_out_file);
+      else
+	fputs ("\t.ascii \"", asm_out_file);
+
       for (i = 0; i < len; i++)
 	{
 	  int c = str[i];
-	  if (c == '\"' || c == '\\')
+	  if (c == '\"')
+	    fputc (XCOFF_DEBUGGING_INFO ? '\"' : '\\', asm_out_file);
+	  else if (c == '\\')
 	    fputc ('\\', asm_out_file);
-	  if (ISPRINT(c))
+	  if (ISPRINT (c))
 	    fputc (c, asm_out_file);
 	  else
 	    fprintf (asm_out_file, "\\%o", c);
@@ -329,7 +423,7 @@ size_of_encoded_value (int encoding)
   switch (encoding & 0x07)
     {
     case DW_EH_PE_absptr:
-      return POINTER_SIZE / BITS_PER_UNIT;
+      return POINTER_SIZE_UNITS;
     case DW_EH_PE_udata2:
       return 2;
     case DW_EH_PE_udata4:
@@ -411,6 +505,8 @@ eh_data_format_name (int format)
   S(DW_EH_PE_sdata4 | DW_EH_PE_funcrel, "funcrel sdata4")
   S(DW_EH_PE_sdata8 | DW_EH_PE_funcrel, "funcrel sdata8")
 
+  S(DW_EH_PE_indirect | DW_EH_PE_absptr, "indirect absolute")
+
   S(DW_EH_PE_indirect | DW_EH_PE_absptr | DW_EH_PE_pcrel,
     "indirect pcrel")
   S(DW_EH_PE_indirect | DW_EH_PE_uleb128 | DW_EH_PE_pcrel,
@@ -491,7 +587,7 @@ eh_data_format_name (int format)
   };
 
   gcc_assert (format >= 0 && format < 0x100 && format_names[format]);
-  
+
   return format_names[format];
 #else
   }
@@ -499,6 +595,26 @@ eh_data_format_name (int format)
 #endif
 }
 
+/* Output an unsigned LEB128 quantity, but only the byte values.  */
+
+void
+dw2_asm_output_data_uleb128_raw (unsigned HOST_WIDE_INT value)
+{
+  while (1)
+    {
+      int byte = (value & 0x7f);
+      value >>= 7;
+      if (value != 0)
+	/* More bytes to follow.  */
+	byte |= 0x80;
+
+      fprintf (asm_out_file, "%#x", byte);
+      if (value == 0)
+	break;
+      fputc (',', asm_out_file);
+    }
+}
+
 /* Output an unsigned LEB128 quantity.  */
 
 void
@@ -509,57 +625,83 @@ dw2_asm_output_data_uleb128 (unsigned HOST_WIDE_INT value,
 
   va_start (ap, comment);
 
-#ifdef HAVE_AS_LEB128
-  fprintf (asm_out_file, "\t.uleb128 " HOST_WIDE_INT_PRINT_HEX , value);
-
-  if (flag_debug_asm && comment)
+  if (HAVE_AS_LEB128)
     {
-      fprintf (asm_out_file, "\t%s ", ASM_COMMENT_START);
-      vfprintf (asm_out_file, comment, ap);
-    }
-#else
-  {
-    unsigned HOST_WIDE_INT work = value;
-    const char *byte_op = targetm.asm_out.byte_op;
-
-    if (byte_op)
-      fputs (byte_op, asm_out_file);
-    do
-      {
-	int byte = (work & 0x7f);
-	work >>= 7;
-	if (work != 0)
-	  /* More bytes to follow.  */
-	  byte |= 0x80;
-
-	if (byte_op)
-	  {
-	    fprintf (asm_out_file, "0x%x", byte);
-	    if (work != 0)
-	      fputc (',', asm_out_file);
-	  }
-	else
-	  assemble_integer (GEN_INT (byte), 1, BITS_PER_UNIT, 1);
-      }
-    while (work != 0);
-
-  if (flag_debug_asm)
-    {
-      fprintf (asm_out_file, "\t%s uleb128 " HOST_WIDE_INT_PRINT_HEX,
-	       ASM_COMMENT_START, value);
-      if (comment)
+      fputs ("\t.uleb128 ", asm_out_file);
+      fprint_whex (asm_out_file, value);
+
+      if (flag_debug_asm && comment)
 	{
-	  fputs ("; ", asm_out_file);
+	  fprintf (asm_out_file, "\t%s ", ASM_COMMENT_START);
 	  vfprintf (asm_out_file, comment, ap);
 	}
     }
-  }
-#endif
-  fputc ('\n', asm_out_file);
+  else
+    {
+      unsigned HOST_WIDE_INT work = value;
+      const char *byte_op = targetm.asm_out.byte_op;
+
+      if (byte_op)
+	fputs (byte_op, asm_out_file);
+      do
+	{
+	  int byte = (work & 0x7f);
+	  work >>= 7;
+	  if (work != 0)
+	    /* More bytes to follow.  */
+	    byte |= 0x80;
+
+	  if (byte_op)
+	    {
+	      fprintf (asm_out_file, "%#x", byte);
+	      if (work != 0)
+		fputc (',', asm_out_file);
+	    }
+	  else
+	    assemble_integer (GEN_INT (byte), 1, BITS_PER_UNIT, 1);
+	}
+      while (work != 0);
+
+      if (flag_debug_asm)
+	{
+	  fprintf (asm_out_file, "\t%s uleb128 " HOST_WIDE_INT_PRINT_HEX,
+		   ASM_COMMENT_START, value);
+	  if (comment)
+	    {
+	      fputs ("; ", asm_out_file);
+	      vfprintf (asm_out_file, comment, ap);
+	    }
+	}
+    }
+
+  putc ('\n', asm_out_file);
 
   va_end (ap);
 }
 
+/* Output an signed LEB128 quantity, but only the byte values.  */
+
+void
+dw2_asm_output_data_sleb128_raw (HOST_WIDE_INT value)
+{
+  int byte, more;
+
+  while (1)
+    {
+      byte = (value & 0x7f);
+      value >>= 7;
+      more = !((value == 0 && (byte & 0x40) == 0)
+		|| (value == -1 && (byte & 0x40) != 0));
+      if (more)
+	byte |= 0x80;
+
+      fprintf (asm_out_file, "%#x", byte);
+      if (!more)
+	break;
+      fputc (',', asm_out_file);
+    }
+}
+
 /* Output a signed LEB128 quantity.  */
 
 void
@@ -570,55 +712,86 @@ dw2_asm_output_data_sleb128 (HOST_WIDE_INT value,
 
   va_start (ap, comment);
 
+  if (HAVE_AS_LEB128)
+    {
+      fprintf (asm_out_file, "\t.sleb128 " HOST_WIDE_INT_PRINT_DEC, value);
+
+      if (flag_debug_asm && comment)
+	{
+	  fprintf (asm_out_file, "\t%s ", ASM_COMMENT_START);
+	  vfprintf (asm_out_file, comment, ap);
+	}
+    }
+  else
+    {
+      HOST_WIDE_INT work = value;
+      int more, byte;
+      const char *byte_op = targetm.asm_out.byte_op;
+
+      if (byte_op)
+	fputs (byte_op, asm_out_file);
+      do
+	{
+	  byte = (work & 0x7f);
+	  /* arithmetic shift */
+	  work >>= 7;
+	  more = !((work == 0 && (byte & 0x40) == 0)
+		   || (work == -1 && (byte & 0x40) != 0));
+	  if (more)
+	    byte |= 0x80;
+
+	  if (byte_op)
+	    {
+	      fprintf (asm_out_file, "%#x", byte);
+	      if (more)
+		fputc (',', asm_out_file);
+	    }
+	  else
+	    assemble_integer (GEN_INT (byte), 1, BITS_PER_UNIT, 1);
+	}
+      while (more);
+
+      if (flag_debug_asm)
+	{
+	  fprintf (asm_out_file, "\t%s sleb128 " HOST_WIDE_INT_PRINT_DEC,
+		   ASM_COMMENT_START, value);
+	  if (comment)
+	    {
+	      fputs ("; ", asm_out_file);
+	      vfprintf (asm_out_file, comment, ap);
+	    }
+	}
+    }
+
+  fputc ('\n', asm_out_file);
+
+  va_end (ap);
+}
+
+/* Output symbol LAB1 as an unsigned LEB128 quantity.  LAB1 should be
+   an assembler-computed constant, e.g. a view number, because we
+   can't have relocations in LEB128 quantities.  */
+
+void
+dw2_asm_output_symname_uleb128 (const char *lab1 ATTRIBUTE_UNUSED,
+				const char *comment, ...)
+{
+  va_list ap;
+
+  va_start (ap, comment);
+
 #ifdef HAVE_AS_LEB128
-  fprintf (asm_out_file, "\t.sleb128 " HOST_WIDE_INT_PRINT_DEC, value);
+  fputs ("\t.uleb128 ", asm_out_file);
+  assemble_name (asm_out_file, lab1);
+#else
+  gcc_unreachable ();
+#endif
 
   if (flag_debug_asm && comment)
     {
       fprintf (asm_out_file, "\t%s ", ASM_COMMENT_START);
       vfprintf (asm_out_file, comment, ap);
     }
-#else
-  {
-    HOST_WIDE_INT work = value;
-    int more, byte;
-    const char *byte_op = targetm.asm_out.byte_op;
-
-    if (byte_op)
-      fputs (byte_op, asm_out_file);
-    do
-      {
-	byte = (work & 0x7f);
-	/* arithmetic shift */
-	work >>= 7;
-	more = !((work == 0 && (byte & 0x40) == 0)
-		 || (work == -1 && (byte & 0x40) != 0));
-	if (more)
-	  byte |= 0x80;
-
-	if (byte_op)
-	  {
-	    fprintf (asm_out_file, "0x%x", byte);
-	    if (more)
-	      fputc (',', asm_out_file);
-	  }
-	else
-	  assemble_integer (GEN_INT (byte), 1, BITS_PER_UNIT, 1);
-      }
-    while (more);
-
-  if (flag_debug_asm)
-    {
-      fprintf (asm_out_file, "\t%s sleb128 " HOST_WIDE_INT_PRINT_DEC,
-	       ASM_COMMENT_START, value);
-      if (comment)
-	{
-	  fputs ("; ", asm_out_file);
-	  vfprintf (asm_out_file, comment, ap);
-	}
-    }
-  }
-#endif
   fputc ('\n', asm_out_file);
 
   va_end (ap);
@@ -633,14 +806,22 @@ dw2_asm_output_delta_uleb128 (const char *lab1 ATTRIBUTE_UNUSED,
 
   va_start (ap, comment);
 
-#ifdef HAVE_AS_LEB128
+  gcc_assert (HAVE_AS_LEB128);
+
   fputs ("\t.uleb128 ", asm_out_file);
   assemble_name (asm_out_file, lab1);
-  fputc ('-', asm_out_file);
-  assemble_name (asm_out_file, lab2);
-#else
-  gcc_unreachable ();
-#endif
+  putc ('-', asm_out_file);
+  /* dwarf2out.c might give us a label expression (e.g. .LVL548-1)
+     as second argument.  If so, make it a subexpression, to make
+     sure the substraction is done in the right order.  */
+  if (strchr (lab2, '-') != NULL)
+    {
+      putc ('(', asm_out_file);
+      assemble_name (asm_out_file, lab2);
+      putc (')', asm_out_file);
+    }
+  else
+    assemble_name (asm_out_file, lab2);
 
   if (flag_debug_asm && comment)
     {
@@ -663,14 +844,12 @@ dw2_asm_output_delta_sleb128 (const char *lab1 ATTRIBUTE_UNUSED,
 
   va_start (ap, comment);
 
-#ifdef HAVE_AS_LEB128
+  gcc_assert (HAVE_AS_LEB128);
+
   fputs ("\t.sleb128 ", asm_out_file);
   assemble_name (asm_out_file, lab1);
-  fputc ('-', asm_out_file);
+  putc ('-', asm_out_file);
   assemble_name (asm_out_file, lab2);
-#else
-  gcc_unreachable ();
-#endif
 
   if (flag_debug_asm && comment)
     {
@@ -683,56 +862,75 @@ dw2_asm_output_delta_sleb128 (const char *lab1 ATTRIBUTE_UNUSED,
 }
 #endif /* 0 */
 
-static rtx dw2_force_const_mem (rtx);
-static int dw2_output_indirect_constant_1 (splay_tree_node, void *);
-
-static GTY((param1_is (char *), param2_is (tree))) splay_tree indirect_pool;
+static GTY(()) hash_map<const char *, tree> *indirect_pool;
 
 static GTY(()) int dw2_const_labelno;
 
-#if defined(HAVE_GAS_HIDDEN) && defined(SUPPORTS_ONE_ONLY)
-# define USE_LINKONCE_INDIRECT 1
+#if defined(HAVE_GAS_HIDDEN)
+# define USE_LINKONCE_INDIRECT (SUPPORTS_ONE_ONLY && !XCOFF_DEBUGGING_INFO)
 #else
 # define USE_LINKONCE_INDIRECT 0
 #endif
 
+/* Compare two std::pair<const char *, tree> by their first element.
+   Returns <0, 0, or
+   >0 to indicate whether K1 is less than, equal to, or greater than
+   K2, respectively.  */
+
+static int
+compare_strings (const void *a, const void *b)
+{
+  const char *s1 = ((const std::pair<const char *, tree> *) a)->first;
+  const char *s2 = ((const std::pair<const char *, tree> *) b)->first;
+  int ret;
+
+  if (s1 == s2)
+    return 0;
+
+  ret = strcmp (s1, s2);
+
+  /* The strings are always those from IDENTIFIER_NODEs, and,
+     therefore, we should never have two copies of the same
+     string.  */
+  gcc_assert (ret);
+
+  return ret;
+}
+
 /* Put X, a SYMBOL_REF, in memory.  Return a SYMBOL_REF to the allocated
    memory.  Differs from force_const_mem in that a single pool is used for
    the entire unit of translation, and the memory is not guaranteed to be
-   "near" the function in any interesting sense.  */
+   "near" the function in any interesting sense.  IS_PUBLIC controls whether
+   the symbol can be shared across the entire application (or DSO).  */
 
-static rtx
-dw2_force_const_mem (rtx x)
+rtx
+dw2_force_const_mem (rtx x, bool is_public)
 {
-  splay_tree_node node;
-  const char *str;
-  tree decl;
+  const char *key;
+  tree decl_id;
 
   if (! indirect_pool)
-    indirect_pool = splay_tree_new_ggc (splay_tree_compare_pointers);
+    indirect_pool = hash_map<const char *, tree>::create_ggc (64);
 
   gcc_assert (GET_CODE (x) == SYMBOL_REF);
 
-  str = targetm.strip_name_encoding (XSTR (x, 0));
-  node = splay_tree_lookup (indirect_pool, (splay_tree_key) str);
-  if (node)
-    decl = (tree) node->value;
+  key = XSTR (x, 0);
+  tree *slot = indirect_pool->get (key);
+  if (slot)
+    decl_id = *slot;
   else
     {
       tree id;
+      const char *str = targetm.strip_name_encoding (key);
 
-      if (USE_LINKONCE_INDIRECT)
+      if (is_public && USE_LINKONCE_INDIRECT)
 	{
-	  char *ref_name = alloca (strlen (str) + sizeof "DW.ref.");
+	  char *ref_name = XALLOCAVEC (char, strlen (str) + sizeof "DW.ref.");
 
 	  sprintf (ref_name, "DW.ref.%s", str);
-	  id = get_identifier (ref_name);
-	  decl = build_decl (VAR_DECL, id, ptr_type_node);
-	  DECL_ARTIFICIAL (decl) = 1;
-	  DECL_IGNORED_P (decl) = 1;
-	  TREE_PUBLIC (decl) = 1;
-	  DECL_INITIAL (decl) = decl;
-	  make_decl_one_only (decl);
+	  gcc_assert (!maybe_get_identifier (ref_name));
+	  decl_id = get_identifier (ref_name);
+	  TREE_PUBLIC (decl_id) = 1;
 	}
       else
 	{
@@ -740,41 +938,63 @@ dw2_force_const_mem (rtx x)
 
 	  ASM_GENERATE_INTERNAL_LABEL (label, "LDFCM", dw2_const_labelno);
 	  ++dw2_const_labelno;
-	  id = get_identifier (label);
-	  decl = build_decl (VAR_DECL, id, ptr_type_node);
-	  DECL_ARTIFICIAL (decl) = 1;
-	  DECL_IGNORED_P (decl) = 1;
-	  TREE_STATIC (decl) = 1;
-	  DECL_INITIAL (decl) = decl;
+	  gcc_assert (!maybe_get_identifier (label));
+	  decl_id = get_identifier (label);
 	}
 
       id = maybe_get_identifier (str);
       if (id)
 	TREE_SYMBOL_REFERENCED (id) = 1;
 
-      splay_tree_insert (indirect_pool, (splay_tree_key) str,
-			 (splay_tree_value) decl);
+      indirect_pool->put (key, decl_id);
     }
 
-  return XEXP (DECL_RTL (decl), 0);
+  return gen_rtx_SYMBOL_REF (Pmode, IDENTIFIER_POINTER (decl_id));
 }
 
-/* A helper function for dw2_output_indirect_constants called through
-   splay_tree_foreach.  Emit one queued constant to memory.  */
+/* A helper function for dw2_output_indirect_constants.  Emit one queued
+   constant to memory.  */
 
 static int
-dw2_output_indirect_constant_1 (splay_tree_node node,
-				void *data ATTRIBUTE_UNUSED)
+dw2_output_indirect_constant_1 (const char *sym, tree id)
 {
-  const char *sym;
   rtx sym_ref;
+  tree decl;
+
+  decl = build_decl (UNKNOWN_LOCATION, VAR_DECL, id, ptr_type_node);
+  SET_DECL_ASSEMBLER_NAME (decl, id);
+  DECL_ARTIFICIAL (decl) = 1;
+  DECL_IGNORED_P (decl) = 1;
+  DECL_INITIAL (decl) = build_fold_addr_expr (decl);
+  TREE_READONLY (decl) = 1;
+  TREE_STATIC (decl) = 1;
+
+  if (TREE_PUBLIC (id))
+    {
+      TREE_PUBLIC (decl) = 1;
+      make_decl_one_only (decl, DECL_ASSEMBLER_NAME (decl));
+      if (USE_LINKONCE_INDIRECT)
+	DECL_VISIBILITY (decl) = VISIBILITY_HIDDEN;
+    }
 
-  sym = (const char *) node->key;
   sym_ref = gen_rtx_SYMBOL_REF (Pmode, sym);
-  if (USE_LINKONCE_INDIRECT)
-    fprintf (asm_out_file, "\t.hidden %sDW.ref.%s\n", user_label_prefix, sym);
-  assemble_variable ((tree) node->value, 1, 1, 1);
-  assemble_integer (sym_ref, POINTER_SIZE / BITS_PER_UNIT, POINTER_SIZE, 1);
+  /* Disable ASan for decl because redzones cause ABI breakage between GCC and
+     libstdc++ for `.LDFCM*' variables.  See PR 78651 for details.  */
+  unsigned int save_flag_sanitize = flag_sanitize;
+  flag_sanitize &= ~(SANITIZE_ADDRESS | SANITIZE_USER_ADDRESS
+		     | SANITIZE_KERNEL_ADDRESS);
+  /* And also temporarily disable -fsection-anchors.  These indirect constants
+     are never referenced from code, so it doesn't make any sense to aggregate
+     them in blocks.  */
+  int save_flag_section_anchors = flag_section_anchors;
+  flag_section_anchors = 0;
+  assemble_variable (decl, 1, 1, 1);
+  flag_section_anchors = save_flag_section_anchors;
+  flag_sanitize = save_flag_sanitize;
+  assemble_integer (sym_ref, POINTER_SIZE_UNITS, POINTER_SIZE, 1);
+  /* The following is a hack recognized by use_blocks_for_decl_p to disable
+     section anchor handling of the decl.  */
+  DECL_INITIAL (decl) = decl;
 
   return 0;
 }
@@ -784,14 +1004,26 @@ dw2_output_indirect_constant_1 (splay_tree_node node,
 void
 dw2_output_indirect_constants (void)
 {
-  if (indirect_pool)
-    splay_tree_foreach (indirect_pool, dw2_output_indirect_constant_1, NULL);
+  if (!indirect_pool)
+    return;
+
+  auto_vec<std::pair<const char *, tree> > temp (indirect_pool->elements ());
+  for (hash_map<const char *, tree>::iterator iter = indirect_pool->begin ();
+       iter != indirect_pool->end (); ++iter)
+    temp.quick_push (*iter);
+
+  temp.qsort (compare_strings);
+
+  for (unsigned int i = 0; i < temp.length (); i++)
+    dw2_output_indirect_constant_1 (temp[i].first, temp[i].second);
 }
 
-/* Like dw2_asm_output_addr_rtx, but encode the pointer as directed.  */
+/* Like dw2_asm_output_addr_rtx, but encode the pointer as directed.
+   If PUBLIC is set and the encoding is DW_EH_PE_indirect, the indirect
+   reference is shared across the entire application (or DSO).  */
 
 void
-dw2_asm_output_encoded_addr_rtx (int encoding, rtx addr,
+dw2_asm_output_encoded_addr_rtx (int encoding, rtx addr, bool is_public,
 				 const char *comment, ...)
 {
   int size;
@@ -805,6 +1037,7 @@ dw2_asm_output_encoded_addr_rtx (int encoding, rtx addr,
     {
       assemble_align (POINTER_SIZE);
       assemble_integer (addr, size, POINTER_SIZE, 1);
+      va_end (ap);
       return;
     }
 
@@ -830,9 +1063,9 @@ dw2_asm_output_encoded_addr_rtx (int encoding, rtx addr,
 	  /* It is very tempting to use force_const_mem so that we share data
 	     with the normal constant pool.  However, we've already emitted
 	     the constant pool for this function.  Moreover, we'd like to
-	     share these constants across the entire unit of translation,
-	     or better, across the entire application (or DSO).  */
-	  addr = dw2_force_const_mem (addr);
+	     share these constants across the entire unit of translation and
+	     even, if possible, across the entire application (or DSO).  */
+	  addr = dw2_force_const_mem (addr, is_public);
 	  encoding &= ~DW_EH_PE_indirect;
 	  goto restart;
 	}
@@ -843,6 +1076,13 @@ dw2_asm_output_encoded_addr_rtx (int encoding, rtx addr,
 	  dw2_assemble_integer (size, addr);
 	  break;
 
+#ifdef ASM_OUTPUT_DWARF_DATAREL
+	case DW_EH_PE_datarel:
+	  gcc_assert (GET_CODE (addr) == SYMBOL_REF);
+	  ASM_OUTPUT_DWARF_DATAREL (asm_out_file, size, XSTR (addr, 0));
+	  break;
+#endif
+
 	case DW_EH_PE_pcrel:
 	  gcc_assert (GET_CODE (addr) == SYMBOL_REF);
 #ifdef ASM_OUTPUT_DWARF_PCREL