From d705c43c5aa1551e91d5dfbd73ea8d4ba0f0758d Mon Sep 17 00:00:00 2001
From: Pedro Alves <palves@redhat.com>
Date: Sat, 3 May 2008 22:30:51 +0000
Subject: [PATCH] 	gdb/ 	* parse.c (parse_exp_in_context): Don't
 override 	expression_context_pc if get_selected_block returned a valid 
 block.

	gdb/testsuite/
	* gdb.base/macscp.exp, gdb.base/macscp1.c: Add test for printing
	expressions with macros.
---
 gdb/ChangeLog                     |  6 ++++++
 gdb/parse.c                       | 26 ++++++++++++--------------
 gdb/testsuite/ChangeLog           |  5 +++++
 gdb/testsuite/gdb.base/macscp.exp | 23 +++++++++++++++++++++++
 gdb/testsuite/gdb.base/macscp1.c  | 13 +++++++++++++
 5 files changed, 59 insertions(+), 14 deletions(-)

diff --git a/gdb/ChangeLog b/gdb/ChangeLog
index 0f458237ea..3e794a3f79 100644
--- a/gdb/ChangeLog
+++ b/gdb/ChangeLog
@@ -1,3 +1,9 @@
+2008-05-03  Pedro Alves  <pedro@codesourcery.com>
+
+	* parse.c (parse_exp_in_context): Don't override
+	expression_context_pc if get_selected_block returned a valid
+	block.
+
 2008-05-03  Daniel Jacobowitz  <dan@codesourcery.com>
 
 	* alpha-tdep.h (ALPHA_REGISTER_BYTES): Delete.
diff --git a/gdb/parse.c b/gdb/parse.c
index 734739afea..9c0edf52a2 100644
--- a/gdb/parse.c
+++ b/gdb/parse.c
@@ -961,26 +961,24 @@ parse_exp_in_context (char **stringptr, struct block *block, int comma,
   old_chain = make_cleanup (free_funcalls, 0 /*ignore*/);
   funcall_chain = 0;
 
-  /* If no context specified, try using the current frame, if any. */
+  expression_context_block = block;
 
-  if (!block)
-    block = get_selected_block (&expression_context_pc);
+  /* If no context specified, try using the current frame, if any.  */
+  if (!expression_context_block)
+    expression_context_block = get_selected_block (&expression_context_pc);
+  else
+    expression_context_pc = BLOCK_START (expression_context_block);
 
-  /* Fall back to using the current source static context, if any. */
+  /* Fall back to using the current source static context, if any.  */
 
-  if (!block)
+  if (!expression_context_block)
     {
       struct symtab_and_line cursal = get_current_source_symtab_and_line ();
       if (cursal.symtab)
-	block = BLOCKVECTOR_BLOCK (BLOCKVECTOR (cursal.symtab), STATIC_BLOCK);
-    }
-
-  /* Save the context, if specified by caller, or found above. */
-
-  if (block)
-    {
-      expression_context_block = block;
-      expression_context_pc = BLOCK_START (block);
+	expression_context_block
+	  = BLOCKVECTOR_BLOCK (BLOCKVECTOR (cursal.symtab), STATIC_BLOCK);
+      if (expression_context_block)
+	expression_context_pc = BLOCK_START (expression_context_block);
     }
 
   expout_size = 10;
diff --git a/gdb/testsuite/ChangeLog b/gdb/testsuite/ChangeLog
index 0cd52d3bbe..78454ce6d2 100644
--- a/gdb/testsuite/ChangeLog
+++ b/gdb/testsuite/ChangeLog
@@ -1,3 +1,8 @@
+2008-05-03  Pedro Alves  <pedro@codesourcery.com>
+
+	* gdb.base/macscp.exp, gdb.base/macscp1.c: Add test for printing
+	expressions with macros.
+
 2008-05-03  Jan Kratochvil  <jan.kratochvil@redhat.com>
 
 	* gdb.base/dfp-test.exp: Fix random FAIL risk on calling functions.
diff --git a/gdb/testsuite/gdb.base/macscp.exp b/gdb/testsuite/gdb.base/macscp.exp
index b04fc0697d..ccefc85835 100644
--- a/gdb/testsuite/gdb.base/macscp.exp
+++ b/gdb/testsuite/gdb.base/macscp.exp
@@ -24,6 +24,7 @@ if $tracelevel then {
 set prms_id 0
 set bug_id 0
 
+set srcfile macscp1.c
 set testfile "macscp"
 set binfile ${objdir}/${subdir}/${testfile}
 
@@ -405,3 +406,25 @@ for {set i 0} {$i < [llength $funcs]} {incr i} {
         }
     }
 }
+
+gdb_test "break [gdb_get_line_number "set breakpoint here"]" \
+    "Breakpoint.*at.* file .*, line.*" \
+    "breakpoint macscp_expr"
+
+gdb_test "continue" "foo = 0;.*" "continue to macsp_expr"
+
+gdb_test "print M" \
+    "No symbol \"M\" in current context\." \
+    "print expression with macro before define."
+
+gdb_test "next" "foo = 1;" "next to definition"
+
+gdb_test "print M" \
+    " = 0" \
+    "print expression with macro in scope."
+
+gdb_test "next" "foo = 2;" "next to definition"
+
+gdb_test "print M" \
+    "No symbol \"M\" in current context\." \
+    "print expression with macro after undef."
diff --git a/gdb/testsuite/gdb.base/macscp1.c b/gdb/testsuite/gdb.base/macscp1.c
index 89a1b07d1e..200ac26200 100644
--- a/gdb/testsuite/gdb.base/macscp1.c
+++ b/gdb/testsuite/gdb.base/macscp1.c
@@ -63,6 +63,18 @@ macscp1_3 ()
   puts ("macscp1_3");
 }
 
+void
+macscp_expr (void)
+{
+  int foo = -1;
+
+  foo = 0;  /* set breakpoint here */
+#define M foo
+  foo = 1;
+#undef M
+  foo = 2;
+}
+
 int
 main (int argc, char **argv)
 {
@@ -77,4 +89,5 @@ main (int argc, char **argv)
   macscp4_2_from_macscp3 ();
   macscp3_2 ();
   macscp1_3 ();
+  macscp_expr ();
 }