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commit 3bf310110722b03d9ff9c4f34f5920a9be2878d0
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Author: Andreas Arnez <arnez@linux.vnet.ibm.com>
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Date: Tue Jun 13 15:20:29 2017 +0200
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Add DWARF piece test cases for bit-field access
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This verifies some of the previous fixes to the logic in
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write_pieced_value when accessing bit-fields.
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gdb/testsuite/ChangeLog:
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* gdb.dwarf2/var-access.exp: Add tests for accessing bit-fields
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located in one or more DWARF pieces.
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### a/gdb/testsuite/ChangeLog
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### b/gdb/testsuite/ChangeLog
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## -1,5 +1,10 @@
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2017-06-13 Andreas Arnez <arnez@linux.vnet.ibm.com>
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+ * gdb.dwarf2/var-access.exp: Add tests for accessing bit-fields
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+ located in one or more DWARF pieces.
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+
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+2017-06-13 Andreas Arnez <arnez@linux.vnet.ibm.com>
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+
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* lib/gdb.exp (get_endianness): New proc.
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* gdb.arch/aarch64-fp.exp: Use it.
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* gdb.arch/altivec-regs.exp: Likewise.
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--- a/gdb/testsuite/gdb.dwarf2/var-access.exp
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+++ b/gdb/testsuite/gdb.dwarf2/var-access.exp
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@@ -62,7 +62,8 @@ Dwarf::assemble $asm_file {
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} {
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declare_labels char_type_label
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declare_labels int_type_label short_type_label
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- declare_labels array_a8_label struct_s_label
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+ declare_labels array_a8_label struct_s_label struct_t_label
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+ declare_labels struct_st_label
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# char
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char_type_label: base_type {
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@@ -115,6 +116,51 @@ Dwarf::assemble $asm_file {
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}
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}
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+ # struct t { int u, x:9, y:13, z:10; };
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+ struct_t_label: structure_type {
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+ {name "t"}
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+ {byte_size 8 DW_FORM_sdata}
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+ } {
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+ member {
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+ {name "u"}
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+ {type :$int_type_label}
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+ }
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+ member {
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+ {name "x"}
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+ {type :$int_type_label}
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+ {data_member_location 4 DW_FORM_udata}
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+ {bit_size 9 DW_FORM_udata}
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+ }
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+ member {
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+ {name "y"}
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+ {type :$int_type_label}
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+ {data_bit_offset 41 DW_FORM_udata}
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+ {bit_size 13 DW_FORM_udata}
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+ }
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+ member {
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+ {name "z"}
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+ {type :$int_type_label}
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+ {data_bit_offset 54 DW_FORM_udata}
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+ {bit_size 10 DW_FORM_udata}
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+ }
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+ }
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+
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+ # struct st { struct s s; struct t t; };
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+ struct_st_label: structure_type {
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+ {name "st"}
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+ {byte_size 12 DW_FORM_udata}
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+ } {
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+ member {
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+ {name "s"}
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+ {type :$struct_s_label}
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+ }
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+ member {
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+ {name "t"}
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+ {type :$struct_t_label}
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+ {data_member_location 4 DW_FORM_udata}
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+ }
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+ }
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+
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DW_TAG_subprogram {
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{MACRO_AT_func { main ${srcdir}/${subdir}/${srcfile} }}
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{DW_AT_external 1 flag}
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@@ -156,6 +202,19 @@ Dwarf::assemble $asm_file {
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piece 1
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} SPECIAL_expr}
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}
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+ # Memory pieces for bitfield access: 8 bytes optimized
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+ # out, 3 bytes from &buf[3], and 1 byte from &buf[1].
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+ DW_TAG_variable {
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+ {name "st1"}
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+ {type :$struct_st_label}
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+ {location {
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+ piece 8
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+ addr "$buf_var + 3"
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+ piece 3
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+ addr "$buf_var + 1"
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+ piece 1
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+ } SPECIAL_expr}
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+ }
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}
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}
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}
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@@ -170,6 +229,9 @@ if ![runto_main] {
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return -1
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}
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+# Determine byte order.
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+set endian [get_endianness]
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+
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# Byte-aligned memory pieces.
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gdb_test "print/d s1" " = \\{a = 2, b = 3, c = 0, d = 1\\}" \
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"s1 == re-ordered buf"
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@@ -200,3 +262,20 @@ gdb_test_no_output "set var s2 = {191, 73, 231, 123}" \
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"re-initialize s2"
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gdb_test "print/d s2" " = \\{a = 191, b = 73, c = 231, d = 123\\}" \
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"verify re-initialized s2"
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+
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+# Unaligned bitfield access through byte-aligned pieces.
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+gdb_test_no_output "set var a = { 0 }"
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+gdb_test_no_output "set var st1.t.x = -7"
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+gdb_test_no_output "set var st1.t.z = 340"
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+gdb_test_no_output "set var st1.t.y = 1234"
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+gdb_test "print st1.t" " = \\{u = <optimized out>, x = -7, y = 1234, z = 340\\}" \
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+ "verify st1.t"
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+switch $endian {
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+ little {set val "0x55, 0x0, 0xf9, 0xa5, 0x9"}
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+ big {set val "0x54, 0x0, 0xfc, 0x93, 0x49"}
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+}
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+# | -- | z:2-9 | -- | x:0-7 | x:8 y:0-6 | y:7-12 z:0-1 | -- | -- |
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+# \_______________________________________________/
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+# val
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+gdb_test "print/x a" " = \\{0x0, ${val}, 0x0, 0x0\\}" \
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+ "verify st1 through a"
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