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author | Tom Tromey <tom@tromey.com> | 2018-04-20 11:50:09 -0600 |
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committer | Tom Tromey <tom@tromey.com> | 2018-04-30 11:25:30 -0600 |
commit | 2b4424c35b9ebabaab8588b2ba6c38935a48efec (patch) | |
tree | 3b1ea57f6b2f1b7d703c4c6532db28b10c74e9d3 /gdb/gdbtypes.h | |
parent | This patch adds support to objdump for disassembly of NFP (Netronome Flow Pro... (diff) | |
download | binutils-gdb-2b4424c35b9ebabaab8588b2ba6c38935a48efec.tar.gz binutils-gdb-2b4424c35b9ebabaab8588b2ba6c38935a48efec.tar.bz2 binutils-gdb-2b4424c35b9ebabaab8588b2ba6c38935a48efec.zip |
Add initial type alignment support
This adds some basic type alignment support to gdb. It changes struct
type to store the alignment, and updates dwarf2read.c to handle
DW_AT_alignment. It also adds a new gdbarch method and updates
i386-tdep.c.
None of this new functionality is used anywhere yet, so tests will
wait until the next patch.
2018-04-30 Tom Tromey <tom@tromey.com>
* i386-tdep.c (i386_type_align): New function.
(i386_gdbarch_init): Update.
* gdbarch.sh (type_align): New method.
* gdbarch.c, gdbarch.h: Rebuild.
* arch-utils.h (default_type_align): Declare.
* arch-utils.c (default_type_align): New function.
* gdbtypes.h (TYPE_ALIGN_BITS): New define.
(struct type) <align_log2>: New field.
<instance_flags>: Now a bitfield.
(TYPE_RAW_ALIGN): New macro.
(type_align, type_raw_align, set_type_align): Declare.
* gdbtypes.c (type_align, type_raw_align, set_type_align): New
functions.
* dwarf2read.c (quirk_rust_enum): Set type alignment.
(get_alignment, maybe_set_alignment): New functions.
(read_structure_type, read_enumeration_type, read_array_type)
(read_set_type, read_tag_pointer_type, read_tag_reference_type)
(read_subrange_type, read_base_type): Set type alignment.
Diffstat (limited to 'gdb/gdbtypes.h')
-rw-r--r-- | gdb/gdbtypes.h | 34 |
1 files changed, 33 insertions, 1 deletions
diff --git a/gdb/gdbtypes.h b/gdb/gdbtypes.h index 552a2a2a164..5f614e573a8 100644 --- a/gdb/gdbtypes.h +++ b/gdb/gdbtypes.h @@ -802,6 +802,10 @@ struct main_type struct dynamic_prop_list *dyn_prop_list; }; +/* * Number of bits allocated for alignment. */ + +#define TYPE_ALIGN_BITS 8 + /* * A ``struct type'' describes a particular instance of a type, with some particular qualification. */ @@ -831,6 +835,14 @@ struct type struct type *chain; + /* * The alignment for this type. Zero means that the alignment was + not specified in the debug info. Note that this is stored in a + funny way: as the log base 2 (plus 1) of the alignment; so a + value of 1 means the alignment is 1, and a value of 9 means the + alignment is 256. */ + + unsigned align_log2 : TYPE_ALIGN_BITS; + /* * Flags specific to this instance of the type, indicating where on the ring we are. @@ -841,7 +853,7 @@ struct type instance flags are completely inherited from the target type. No qualifiers can be cleared by the typedef. See also check_typedef. */ - int instance_flags; + unsigned instance_flags : 9; /* * Length of storage for a value of this type. The value is the expression in host bytes of what sizeof(type) would return. This @@ -1292,6 +1304,26 @@ extern void allocate_gnat_aux_type (struct type *); so you only have to call check_typedef once. Since allocate_value calls check_typedef, TYPE_LENGTH (VALUE_TYPE (X)) is safe. */ #define TYPE_LENGTH(thistype) (thistype)->length + +/* * Return the alignment of the type in target addressable memory + units, or 0 if no alignment was specified. */ +#define TYPE_RAW_ALIGN(thistype) type_raw_align (thistype) + +/* * Return the alignment of the type in target addressable memory + units, or 0 if no alignment was specified. */ +extern unsigned type_raw_align (struct type *); + +/* * Return the alignment of the type in target addressable memory + units. Return 0 if the alignment cannot be determined; but note + that this makes an effort to compute the alignment even it it was + not specified in the debug info. */ +extern unsigned type_align (struct type *); + +/* * Set the alignment of the type. The alignment must be a power of + 2. Returns false if the given value does not fit in the available + space in struct type. */ +extern bool set_type_align (struct type *, ULONGEST); + /* * Note that TYPE_CODE can be TYPE_CODE_TYPEDEF, so if you want the real type, you need to do TYPE_CODE (check_type (this_type)). */ #define TYPE_CODE(thistype) TYPE_MAIN_TYPE(thistype)->code |