From: Alan Modra <amodra@gmail.com>
Date: Wed, 20 Jul 2016 00:14:46 +0000 (+0930)
Subject: Early expression evaluation
X-Git-Url: https://git.libre-soc.org/?a=commitdiff_plain;h=b751e639;p=binutils-gdb.git

Early expression evaluation

Folding a constant expression early can lead to loss of tokens, eg.
ABSOLUTE, that are significant in ld's horrible context sensitive
expression evaluation.  Also, MAXPAGESIZE and other "constants" may
not have taken values specified on the command line, leading to the
wrong value being cached.

	* ldexp.c (exp_unop, exp_binop, exp_trinop, exp_nameop): Don't
	fold expression.
	* testsuite/ld-elf/maxpage3b.d: Expect correct maxpagesize.
---

diff --git a/ld/ChangeLog b/ld/ChangeLog
index 9dc24b4226c..b7442751328 100644
--- a/ld/ChangeLog
+++ b/ld/ChangeLog
@@ -1,3 +1,9 @@
+2016-07-20  Alan Modra  <amodra@gmail.com>
+
+	* ldexp.c (exp_unop, exp_binop, exp_trinop, exp_nameop): Don't
+	fold expression.
+	* testsuite/ld-elf/maxpage3b.d: Expect correct maxpagesize.
+
 2016-07-19  Roland McGrath  <roland@hack.frob.com>
 
 	* emulparams/aarch64elf.sh (GENERATE_PIE_SCRIPT): Set to yes.
diff --git a/ld/ldexp.c b/ld/ldexp.c
index 68c4bc58690..a560643fb33 100644
--- a/ld/ldexp.c
+++ b/ld/ldexp.c
@@ -1255,80 +1255,55 @@ exp_fold_tree_no_dot (etree_type *tree)
 etree_type *
 exp_binop (int code, etree_type *lhs, etree_type *rhs)
 {
-  etree_type value, *new_e;
-
-  value.type.node_code = code;
-  value.type.filename = lhs->type.filename;
-  value.type.lineno = lhs->type.lineno;
-  value.binary.lhs = lhs;
-  value.binary.rhs = rhs;
-  value.type.node_class = etree_binary;
-  exp_fold_tree_no_dot (&value);
-  if (expld.result.valid_p)
-    return exp_intop (expld.result.value);
-
-  new_e = (etree_type *) stat_alloc (sizeof (new_e->binary));
-  memcpy (new_e, &value, sizeof (new_e->binary));
+  etree_type *new_e = (etree_type *) stat_alloc (sizeof (new_e->binary));
+
+  new_e->type.node_code = code;
+  new_e->type.filename = lhs->type.filename;
+  new_e->type.lineno = lhs->type.lineno;
+  new_e->binary.lhs = lhs;
+  new_e->binary.rhs = rhs;
+  new_e->type.node_class = etree_binary;
   return new_e;
 }
 
 etree_type *
 exp_trinop (int code, etree_type *cond, etree_type *lhs, etree_type *rhs)
 {
-  etree_type value, *new_e;
-
-  value.type.node_code = code;
-  value.type.filename = cond->type.filename;
-  value.type.lineno = cond->type.lineno;
-  value.trinary.lhs = lhs;
-  value.trinary.cond = cond;
-  value.trinary.rhs = rhs;
-  value.type.node_class = etree_trinary;
-  exp_fold_tree_no_dot (&value);
-  if (expld.result.valid_p)
-    return exp_intop (expld.result.value);
-
-  new_e = (etree_type *) stat_alloc (sizeof (new_e->trinary));
-  memcpy (new_e, &value, sizeof (new_e->trinary));
+  etree_type *new_e = (etree_type *) stat_alloc (sizeof (new_e->trinary));
+
+  new_e->type.node_code = code;
+  new_e->type.filename = cond->type.filename;
+  new_e->type.lineno = cond->type.lineno;
+  new_e->trinary.lhs = lhs;
+  new_e->trinary.cond = cond;
+  new_e->trinary.rhs = rhs;
+  new_e->type.node_class = etree_trinary;
   return new_e;
 }
 
 etree_type *
 exp_unop (int code, etree_type *child)
 {
-  etree_type value, *new_e;
-
-  value.unary.type.node_code = code;
-  value.unary.type.filename = child->type.filename;
-  value.unary.type.lineno = child->type.lineno;
-  value.unary.child = child;
-  value.unary.type.node_class = etree_unary;
-  exp_fold_tree_no_dot (&value);
-  if (expld.result.valid_p)
-    return exp_intop (expld.result.value);
+  etree_type *new_e = (etree_type *) stat_alloc (sizeof (new_e->unary));
 
-  new_e = (etree_type *) stat_alloc (sizeof (new_e->unary));
-  memcpy (new_e, &value, sizeof (new_e->unary));
+  new_e->unary.type.node_code = code;
+  new_e->unary.type.filename = child->type.filename;
+  new_e->unary.type.lineno = child->type.lineno;
+  new_e->unary.child = child;
+  new_e->unary.type.node_class = etree_unary;
   return new_e;
 }
 
 etree_type *
 exp_nameop (int code, const char *name)
 {
-  etree_type value, *new_e;
-
-  value.name.type.node_code = code;
-  value.name.type.filename = ldlex_filename ();
-  value.name.type.lineno = lineno;
-  value.name.name = name;
-  value.name.type.node_class = etree_name;
-
-  exp_fold_tree_no_dot (&value);
-  if (expld.result.valid_p)
-    return exp_intop (expld.result.value);
+  etree_type *new_e = (etree_type *) stat_alloc (sizeof (new_e->name));
 
-  new_e = (etree_type *) stat_alloc (sizeof (new_e->name));
-  memcpy (new_e, &value, sizeof (new_e->name));
+  new_e->name.type.node_code = code;
+  new_e->name.type.filename = ldlex_filename ();
+  new_e->name.type.lineno = lineno;
+  new_e->name.name = name;
+  new_e->name.type.node_class = etree_name;
   return new_e;
 
 }
diff --git a/ld/testsuite/ld-elf/maxpage3b.d b/ld/testsuite/ld-elf/maxpage3b.d
index 4bee0ec447c..62b50c91582 100644
--- a/ld/testsuite/ld-elf/maxpage3b.d
+++ b/ld/testsuite/ld-elf/maxpage3b.d
@@ -4,7 +4,8 @@
 #target: x86_64-*-linux*
 
 #...
-  \[[ 0-9]+\] \.data[ \t]+PROGBITS[ \t]+0*200000[ \t]+[ \t0-9a-f]+WA?.*
+  \[[ 0-9]+\] \.data[ \t]+PROGBITS[ \t]+0*10000000[ \t]+[ \t0-9a-f]+WA?.*
 #...
   LOAD+.*0x10000000
+  LOAD+.*0x10000000
 #pass