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gdb.dwarf2: Define and use gdb_target_symbol for symbol prefixes

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Some of the tests in gdb.dwarf2 which use Dwarf::assemble refer to
(minimal/linker) symbols created in the course of building a small
test program.  Some targets use a prefix such as underscore ("_") on
these symbols.  Many of the tests in gdb.dwarf2 do not take this into
account.  As a consequence, these tests fail to build, resulting
either in failures or untested testcases.

Here is an example from gdb.dwarf2/dw2-regno-invalid.exp:

    Dwarf::assemble $asm_file {
        cu {} {
            compile_unit {
                {low_pc main DW_FORM_addr}
                {high_pc main+0x10000 DW_FORM_addr}
            } {
            ...
            }

For targets which require an underscore prefix on linker symbols,
the two occurrences of "main" would have to have a prepended underscore,
i.e. _main instead of main.

For the above case, a call to the new proc gdb_target_symbol is used
prepend the correct prefix to the symbol.  I.e. the above code is
rewritten (as shown in the patch) as follows:

    Dwarf::assemble $asm_file {
        cu {} {
            compile_unit {
                {low_pc [gdb_target_symbol main] DW_FORM_addr}
                {high_pc [gdb_target_symbol main]+0x10000 DW_FORM_addr}
            } {
            ...
            }

I also found it necessary to make an adjustment to lib/dwarf.exp so that
expressions of more than just one list element can be used in DW_TAG_...
constructs.  Both atomic-type.exp and dw2-bad-mips-linkage-name.exp require
this new functionality.

gdb/testsuite/ChangeLog:

	* lib/gdb.exp (gdb_target_symbol_prefix, gdb_target_symbol):
	New procs.
	* lib/dwarf.exp (_handle_DW_TAG): Handle attribute values,
	representing expressions, of more than one list element.
	* gdb.dwarf2/atomic-type.exp (Dwarf::assemble): Use gdb_target_symbol
	to prepend linker symbol prefix to f.
	* gdb.dwarf2/data-loc.exp (Dwarf::assemble): Likewise, for
	table_1 and table_2.
	* gdb.dwarf2/dw2-bad-mips-linkage-name.exp (Dwarf::assemble):
	Likewise, for f and g.
	* gdb.dwarf2/dw2-ifort-parameter.exp (Dwarf::assemble): Likewise,
	for ptr.
	* gdb.dwarf2/dw2-regno-invalid.exp (Dwarf::assemble): Likewise,
	for main.
	* gdb.dwarf2/dynarr-ptr.exp (Dwarf::assemble): Likewise, for
	table_1_ptr and table_2_ptr.
This commit is contained in:
Kevin Buettner 2015-10-28 11:36:06 -07:00
parent 96f9814df2
commit 2223449a47
9 changed files with 96 additions and 18 deletions
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19
gdb/testsuite/ChangeLog
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@ -1,3 +1,22 @@
2015-11-05 Kevin Buettner <kevinb@redhat.com>
* lib/gdb.exp (gdb_target_symbol_prefix, gdb_target_symbol):
New procs.
* lib/dwarf.exp (_handle_DW_TAG): Handle attribute values,
representing expressions, of more than one list element.
* gdb.dwarf2/atomic-type.exp (Dwarf::assemble): Use gdb_target_symbol
to prepend linker symbol prefix to f.
* gdb.dwarf2/data-loc.exp (Dwarf::assemble): Likewise, for
table_1 and table_2.
* gdb.dwarf2/dw2-bad-mips-linkage-name.exp (Dwarf::assemble):
Likewise, for f and g.
* gdb.dwarf2/dw2-ifort-parameter.exp (Dwarf::assemble): Likewise,
for ptr.
* gdb.dwarf2/dw2-regno-invalid.exp (Dwarf::assemble): Likewise,
for main.
* gdb.dwarf2/dynarr-ptr.exp (Dwarf::assemble): Likewise, for
table_1_ptr and table_2_ptr.
2015-11-03 Jan Kratochvil <jan.kratochvil@redhat.com>
Joel Brobecker <brobecker@adacore.com>

2
gdb/testsuite/gdb.dwarf2/atomic-type.exp
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@ -68,7 +68,7 @@ Dwarf::assemble $asm_file {
DW_TAG_subprogram {
{name f}
{low_pc f addr}
{low_pc [gdb_target_symbol f] addr}
{high_pc f_end_lbl addr}
{type :$i_l}
} {

8
gdb/testsuite/gdb.dwarf2/data-loc.exp
View File

@ -84,7 +84,7 @@ Dwarf::assemble $asm_file {
{DW_AT_name foo__three}
{DW_AT_type :$array_label}
{DW_AT_location {
DW_OP_addr table_1
DW_OP_addr [gdb_target_symbol table_1]
} SPECIAL_expr}
{external 1 flag}
}
@ -92,7 +92,7 @@ Dwarf::assemble $asm_file {
{DW_AT_name foo__three_tdef}
{DW_AT_type :$array_ptr_label}
{DW_AT_location {
DW_OP_addr table_1
DW_OP_addr [gdb_target_symbol table_1]
} SPECIAL_expr}
{external 1 flag}
}
@ -100,7 +100,7 @@ Dwarf::assemble $asm_file {
{DW_AT_name foo__five}
{DW_AT_type :$array_label}
{DW_AT_location {
DW_OP_addr table_2
DW_OP_addr [gdb_target_symbol table_2]
} SPECIAL_expr}
{external 1 flag}
}
@ -108,7 +108,7 @@ Dwarf::assemble $asm_file {
{DW_AT_name foo__five_tdef}
{DW_AT_type :$array_ptr_label}
{DW_AT_location {
DW_OP_addr table_2
DW_OP_addr [gdb_target_symbol table_2]
} SPECIAL_expr}
{external 1 flag}
}

4
gdb/testsuite/gdb.dwarf2/dw2-bad-mips-linkage-name.exp
View File

@ -42,14 +42,14 @@ Dwarf::assemble $asm_file {
}
DW_TAG_subprogram {
{name f}
{low_pc f addr}
{low_pc [gdb_target_symbol f] addr}
{high_pc f_end_lbl addr}
{type :$b_l}
{DW_AT_MIPS_linkage_name _Z1fv}
}
DW_TAG_subprogram {
{name g}
{low_pc g addr}
{low_pc [gdb_target_symbol g] addr}
{high_pc g_end_lbl addr}
{type :$b_l}
{DW_AT_MIPS_linkage_name 42 DW_FORM_data1}

2
gdb/testsuite/gdb.dwarf2/dw2-ifort-parameter.exp
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@ -53,7 +53,7 @@ Dwarf::assemble $asm_file {
{variable_parameter 1 flag}
{type :$int_label}
{location {
addr ptr
addr [gdb_target_symbol ptr]
deref
} SPECIAL_expr}
}

8
gdb/testsuite/gdb.dwarf2/dw2-regno-invalid.exp
View File

@ -29,8 +29,8 @@ set asm_file [standard_output_file $srcfile]
Dwarf::assemble $asm_file {
cu {} {
compile_unit {
{low_pc main DW_FORM_addr}
{high_pc main+0x10000 DW_FORM_addr}
{low_pc [gdb_target_symbol main] DW_FORM_addr}
{high_pc [gdb_target_symbol main]+0x10000 DW_FORM_addr}
} {
declare_labels integer_label
@ -43,8 +43,8 @@ Dwarf::assemble $asm_file {
DW_TAG_subprogram {
{name main}
{DW_AT_external 1 flag}
{low_pc main DW_FORM_addr}
{high_pc main+0x10000 DW_FORM_addr}
{low_pc [gdb_target_symbol main] DW_FORM_addr}
{high_pc [gdb_target_symbol main]+0x10000 DW_FORM_addr}
} {
DW_TAG_variable {
{DW_AT_name bregx}

8
gdb/testsuite/gdb.dwarf2/dynarr-ptr.exp
View File

@ -85,7 +85,7 @@ Dwarf::assemble $asm_file {
{DW_AT_name foo__three_ptr}
{DW_AT_type :$array_ptr_label}
{DW_AT_location {
DW_OP_addr table_1_ptr
DW_OP_addr [gdb_target_symbol table_1_ptr]
} SPECIAL_expr}
{external 1 flag}
}
@ -93,7 +93,7 @@ Dwarf::assemble $asm_file {
{DW_AT_name foo__three_ptr_tdef}
{DW_AT_type :$array_typedef_label}
{DW_AT_location {
DW_OP_addr table_1_ptr
DW_OP_addr [gdb_target_symbol table_1_ptr]
} SPECIAL_expr}
{external 1 flag}
}
@ -101,7 +101,7 @@ Dwarf::assemble $asm_file {
{DW_AT_name foo__five_ptr}
{DW_AT_type :$array_ptr_label}
{DW_AT_location {
DW_OP_addr table_2_ptr
DW_OP_addr [gdb_target_symbol table_2_ptr]
} SPECIAL_expr}
{external 1 flag}
}
@ -109,7 +109,7 @@ Dwarf::assemble $asm_file {
{DW_AT_name foo__five_ptr_tdef}
{DW_AT_type :$array_typedef_label}
{DW_AT_location {
DW_OP_addr table_2_ptr
DW_OP_addr [gdb_target_symbol table_2_ptr]
} SPECIAL_expr}
{external 1 flag}
}

15
gdb/testsuite/lib/dwarf.exp
View File

@ -621,7 +621,18 @@ namespace eval Dwarf {
foreach attr $attrs {
set attr_name [_map_name [lindex $attr 0] _AT]
set attr_value [uplevel 2 [list subst [lindex $attr 1]]]
# When the length of ATTR is greater than 2, the last
# element of the list must be a form. The second through
# the penultimate elements are joined together and
# evaluated using subst. This allows constructs such as
# [gdb_target_symbol foo] to be used.
if {[llength $attr] > 2} {
set attr_value [uplevel 2 [list subst [join [lrange $attr 1 end-1]]]]
} else {
set attr_value [uplevel 2 [list subst [lindex $attr 1]]]
}
if { [string equal "MACRO_AT_func" $attr_name] } {
_handle_macro_at_func $attr_value
@ -629,7 +640,7 @@ namespace eval Dwarf {
_handle_macro_at_range $attr_value
} else {
if {[llength $attr] > 2} {
set attr_form [lindex $attr 2]
set attr_form [lindex $attr end]
} else {
# If the value looks like an integer, a form is required.
if [string is integer $attr_value] {

48
gdb/testsuite/lib/gdb.exp
View File

@ -5523,6 +5523,54 @@ proc core_find {binfile {deletefiles {}} {arg ""}} {
return $destcore
}
# gdb_target_symbol_prefix compiles a test program and then examines
# the output from objdump to determine the prefix (such as underscore)
# for linker symbol prefixes.
gdb_caching_proc gdb_target_symbol_prefix {
# Set up and compile a simple test program...
set src [standard_temp_file main[pid].c]
set exe [standard_temp_file main[pid].x]
gdb_produce_source $src {
int main() {
return 0;
}
}
verbose "compiling testfile $src" 2
set compile_flags {debug nowarnings quiet}
set lines [gdb_compile $src $exe executable $compile_flags]
set prefix ""
if ![string match "" $lines] then {
verbose "gdb_target_symbol_prefix: testfile compilation failed, returning null prefix" 2
} else {
set objdump_program [gdb_find_objdump]
set result [catch "exec $objdump_program --syms $exe" output]
if { $result == 0 \
&& ![regexp -lineanchor \
{ ([^ a-zA-Z0-9]*)main$} $output dummy prefix] } {
verbose "gdb_target_symbol_prefix: Could not find main in objdump output; returning null prefix" 2
}
}
file delete $src
file delete $exe
return $prefix
}
# gdb_target_symbol returns the provided symbol with the correct prefix
# prepended. (See gdb_target_symbol_prefix, above.)
proc gdb_target_symbol { symbol } {
set prefix [gdb_target_symbol_prefix]
return "${prefix}${symbol}"
}
# gdb_target_symbol_prefix_flags returns a string that can be added
# to gdb_compile options to define SYMBOL_PREFIX macro value
# symbol_prefix_flags returns a string that can be added