[committed][gdb/symtab] Fix disassembly of non-contiguous functions

[Tom de Vries <tdevries@suse.de>]

Hi,

When running test-case gdb.dwarf2/dw2-ranges-func.exp with target board
readnow, we have:
...
FAIL: gdb.dwarf2/dw2-ranges-func.exp: disassemble foo (pattern 2)
...

The function foo consists of two ranges:
...
 <1><12f>: Abbrev Number: 7 (DW_TAG_subprogram)
    <130>   DW_AT_external    : 1
    <131>   DW_AT_name        : foo
    <135>   DW_AT_ranges      : 0x40
...
which are listed here:
...
    00000040 00000000004004c1 00000000004004dc
    00000040 00000000004004ae 00000000004004ba
...

Normally the disassemble instruction lists both ranges, but with -readnow it
only lists the first.

This is due to function find_pc_partial_function, which only interacts with
partial symtabs, but not with expanded ones.

Fix this by using find_pc_sect_compunit_symtab in find_pc_partial_function.

Tested on x86_64, with native and target board readnow.

This fixes 19 FAILs for target board readnow, in test-cases
gdb.arch/amd64-entry-value.exp, gdb.base/multi-forks.exp,
gdb.dwarf2/dw2-ranges-func.exp and gdb.linespec/skip-two.exp.

Committed to trunk.

Thanks,
- Tom

[gdb/symtab] Fix disassembly of non-contiguous functions

gdb/ChangeLog:

2020-04-22  Tom de Vries  <tdevries@suse.de>

	* blockframe.c (find_pc_partial_function): Use
	find_pc_sect_compunit_symtab rather than
	objfile->sf->qf->find_pc_sect_compunit_symtab.

---
 gdb/blockframe.c | 14 +-------------
 1 file changed, 1 insertion(+), 13 deletions(-)

diff --git a/gdb/blockframe.c b/gdb/blockframe.c
index 4f8fa42dc6b..09c3eed48db 100644
--- a/gdb/blockframe.c
+++ b/gdb/blockframe.c
@@ -236,19 +236,7 @@ find_pc_partial_function (CORE_ADDR pc, const char **name, CORE_ADDR *address,
     goto return_cached_value;
 
   msymbol = lookup_minimal_symbol_by_pc_section (mapped_pc, section);
-  for (objfile *objfile : current_program_space->objfiles ())
-    {
-      if (objfile->sf)
-	{
-	  compunit_symtab
-	    = objfile->sf->qf->find_pc_sect_compunit_symtab (objfile, msymbol,
-							     mapped_pc,
-							     section,
-							     0);
-	}
-      if (compunit_symtab != NULL)
-	break;
-    }
+  compunit_symtab = find_pc_sect_compunit_symtab (mapped_pc, section);
 
   if (compunit_symtab != NULL)
     {