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Add DWARF piece test cases for bit-field access 

This verifies some of the previous fixes to the logic in
write_pieced_value when accessing bit-fields.

gdb/testsuite/ChangeLog:

	* gdb.dwarf2/var-access.exp: Add tests for accessing bit-fields
	located in one or more DWARF pieces.
This commit is contained in:
Andreas Arnez 2017-06-13 15:20:29 +02:00
parent 359b19bb24
commit 3bf3101107
2 changed files with 85 additions and 1 deletions
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5
gdb/testsuite/ChangeLog
View File

@ -1,3 +1,8 @@
2017-06-13 Andreas Arnez <arnez@linux.vnet.ibm.com>
* gdb.dwarf2/var-access.exp: Add tests for accessing bit-fields
located in one or more DWARF pieces.
2017-06-13 Andreas Arnez <arnez@linux.vnet.ibm.com>
* lib/gdb.exp (get_endianness): New proc.

81
gdb/testsuite/gdb.dwarf2/var-access.exp
View File

@ -62,7 +62,8 @@ Dwarf::assemble $asm_file {
} {
declare_labels char_type_label
declare_labels int_type_label short_type_label
declare_labels array_a8_label struct_s_label
declare_labels array_a8_label struct_s_label struct_t_label
declare_labels struct_st_label
# char
char_type_label: base_type {
@ -115,6 +116,51 @@ Dwarf::assemble $asm_file {
}
}
# struct t { int u, x:9, y:13, z:10; };
struct_t_label: structure_type {
{name "t"}
{byte_size 8 DW_FORM_sdata}
} {
member {
{name "u"}
{type :$int_type_label}
}
member {
{name "x"}
{type :$int_type_label}
{data_member_location 4 DW_FORM_udata}
{bit_size 9 DW_FORM_udata}
}
member {
{name "y"}
{type :$int_type_label}
{data_bit_offset 41 DW_FORM_udata}
{bit_size 13 DW_FORM_udata}
}
member {
{name "z"}
{type :$int_type_label}
{data_bit_offset 54 DW_FORM_udata}
{bit_size 10 DW_FORM_udata}
}
}
# struct st { struct s s; struct t t; };
struct_st_label: structure_type {
{name "st"}
{byte_size 12 DW_FORM_udata}
} {
member {
{name "s"}
{type :$struct_s_label}
}
member {
{name "t"}
{type :$struct_t_label}
{data_member_location 4 DW_FORM_udata}
}
}
DW_TAG_subprogram {
{MACRO_AT_func { main ${srcdir}/${subdir}/${srcfile} }}
{DW_AT_external 1 flag}
@ -156,6 +202,19 @@ Dwarf::assemble $asm_file {
piece 1
} SPECIAL_expr}
}
# Memory pieces for bitfield access: 8 bytes optimized
# out, 3 bytes from &buf[3], and 1 byte from &buf[1].
DW_TAG_variable {
{name "st1"}
{type :$struct_st_label}
{location {
piece 8
addr "$buf_var + 3"
piece 3
addr "$buf_var + 1"
piece 1
} SPECIAL_expr}
}
}
}
}
@ -170,6 +229,9 @@ if ![runto_main] {
return -1
}
# Determine byte order.
set endian [get_endianness]
# Byte-aligned memory pieces.
gdb_test "print/d s1" " = \\{a = 2, b = 3, c = 0, d = 1\\}" \
"s1 == re-ordered buf"
@ -200,3 +262,20 @@ gdb_test_no_output "set var s2 = {191, 73, 231, 123}" \
"re-initialize s2"
gdb_test "print/d s2" " = \\{a = 191, b = 73, c = 231, d = 123\\}" \
"verify re-initialized s2"
# Unaligned bitfield access through byte-aligned pieces.
gdb_test_no_output "set var a = { 0 }"
gdb_test_no_output "set var st1.t.x = -7"
gdb_test_no_output "set var st1.t.z = 340"
gdb_test_no_output "set var st1.t.y = 1234"
gdb_test "print st1.t" " = \\{u = <optimized out>, x = -7, y = 1234, z = 340\\}" \
"verify st1.t"
switch $endian {
little {set val "0x55, 0x0, 0xf9, 0xa5, 0x9"}
big {set val "0x54, 0x0, 0xfc, 0x93, 0x49"}
}
# | -- | z:2-9 | -- | x:0-7 | x:8 y:0-6 | y:7-12 z:0-1 | -- | -- |
# \_______________________________________________/
# val
gdb_test "print/x a" " = \\{0x0, ${val}, 0x0, 0x0\\}" \
"verify st1 through a"