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binutils-gdb/gdb/testsuite/lib/dwarf.exp

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# Copyright 2010-2014 Free Software Foundation, Inc.
# This program is free software; you can redistribute it and/or modify
# it under the terms of the GNU General Public License as published by
# the Free Software Foundation; either version 3 of the License, or
# (at your option) any later version.
#
# This program is distributed in the hope that it will be useful,
# but WITHOUT ANY WARRANTY; without even the implied warranty of
# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
# GNU General Public License for more details.
#
# You should have received a copy of the GNU General Public License
# along with this program. If not, see <http://www.gnu.org/licenses/>.
# Return true if the target supports DWARF-2 and uses gas.
# For now pick a sampling of likely targets.
proc dwarf2_support {} {
if {[istarget *-*-linux*]
|| [istarget *-*-gnu*]
|| [istarget *-*-elf*]
|| [istarget *-*-openbsd*]
|| [istarget arm*-*-eabi*]
|| [istarget arm*-*-symbianelf*]
|| [istarget powerpc-*-eabi*]} {
return 1
}
return 0
}
# Build an executable from a fission-based .S file.
# This handles the extra work of splitting the .o into non-dwo and dwo
# pieces, making sure the .dwo is available if we're using cc-with-tweaks.sh
# to build a .dwp file.
# The arguments and results are the same as for build_executable.
#
# Current restrictions:
# - only supports one source file
# - cannot be run on remote hosts
proc build_executable_from_fission_assembler { testname executable sources options } {
verbose -log "build_executable_from_fission_assembler $testname $executable $sources $options"
if { [llength $sources] != 1 } {
error "Only one source file supported."
}
if [is_remote host] {
error "Remote hosts are not supported."
}
global srcdir subdir
set source_file ${srcdir}/${subdir}/${sources}
set root_name [file rootname [file tail $source_file]]
set output_base [standard_output_file $root_name]
set object_file ${output_base}.o
set dwo_file ${output_base}.dwo
set object_options "object $options"
set objcopy [gdb_find_objcopy]
set result [gdb_compile $source_file $object_file object $options]
if { "$result" != "" } {
return -1
}
set command "$objcopy --extract-dwo $object_file $dwo_file"
verbose -log "Executing $command"
set result [catch "exec $command" output]
verbose -log "objcopy --extract-dwo output: $output"
if { $result == 1 } {
return -1
}
set command "$objcopy --strip-dwo $object_file"
verbose -log "Executing $command"
set result [catch "exec $command" output]
verbose -log "objcopy --strip-dwo output: $output"
if { $result == 1 } {
return -1
}
set result [gdb_compile $object_file $executable executable {nodebug}]
if { "$result" != "" } {
return -1
}
return 0
}
# A DWARF assembler.
#
# All the variables in this namespace are private to the
# implementation. Also, any procedure whose name starts with "_" is
# private as well. Do not use these.
#
# Exported functions are documented at their definition.
#
# In addition to the hand-written functions documented below, this
# module automatically generates a function for each DWARF tag. For
# most tags, two forms are made: a full name, and one with the
# "DW_TAG_" prefix stripped. For example, you can use either
# 'DW_TAG_compile_unit' or 'compile_unit' interchangeably.
#
# There are two exceptions to this rule: DW_TAG_variable and
# DW_TAG_namespace. For these, the full name must always be used,
# as the short name conflicts with Tcl builtins. (Should future
# versions of Tcl or DWARF add more conflicts, this list will grow.
# If you want to be safe you should always use the full names.)
#
# Each tag procedure is defined like:
#
# proc DW_TAG_mumble {{attrs {}} {children {}}} { ... }
#
# ATTRS is an optional list of attributes.
# It is run through 'subst' in the caller's context before processing.
#
# Each attribute in the list has one of two forms:
# 1. { NAME VALUE }
# 2. { NAME VALUE FORM }
#
# In each case, NAME is the attribute's name.
# This can either be the full name, like 'DW_AT_name', or a shortened
# name, like 'name'. These are fully equivalent.
#
# If FORM is given, it should name a DW_FORM_ constant.
# This can either be the short form, like 'DW_FORM_addr', or a
# shortened version, like 'addr'. If the form is given, VALUE
# is its value; see below. In some cases, additional processing
# is done; for example, DW_FORM_strp manages the .debug_str
# section automatically.
#
# If FORM is 'SPECIAL_expr', then VALUE is treated as a location
# expression. The effective form is then DW_FORM_block, and VALUE
# is passed to the (internal) '_location' proc to be translated.
# This proc implements a miniature DW_OP_ assembler.
#
# If FORM is not given, it is guessed:
# * If VALUE starts with the "@" character, the rest of VALUE is
# looked up as a DWARF constant, and DW_FORM_sdata is used. For
# example, '@DW_LANG_c89' could be used.
# * If VALUE starts with the ":" character, then it is a label
# reference. The rest of VALUE is taken to be the name of a label,
# and DW_FORM_ref4 is used. See 'new_label' and 'define_label'.
# * Otherwise, VALUE is taken to be a string and DW_FORM_string is
# used.
# More form-guessing functionality may be added.
#
# CHILDREN is just Tcl code that can be used to define child DIEs. It
# is evaluated in the caller's context.
#
# Currently this code is missing nice support for CFA handling, and
# probably other things as well.
namespace eval Dwarf {
# True if the module has been initialized.
variable _initialized 0
# Constants from dwarf2.h.
variable _constants
# DW_AT short names.
variable _AT
# DW_FORM short names.
variable _FORM
# DW_OP short names.
variable _OP
# The current output file.
variable _output_file
# Note: The _cu_ values here also apply to type units (TUs).
# Think of a TU as a special kind of CU.
# Current CU count.
variable _cu_count
# The current CU's base label.
variable _cu_label
# The current CU's version.
variable _cu_version
# The current CU's address size.
variable _cu_addr_size
# The current CU's offset size.
variable _cu_offset_size
# Label generation number.
variable _label_num
# The deferred output array. The index is the section name; the
# contents hold the data for that section.
variable _deferred_output
# If empty, we should write directly to the output file.
# Otherwise, this is the name of a section to write to.
variable _defer
# The abbrev section. Typically .debug_abbrev but can be .debug_abbrev.dwo
# for Fission.
variable _abbrev_section
# The next available abbrev number in the current CU's abbrev
# table.
variable _abbrev_num
# The string table for this assembly. The key is the string; the
# value is the label for that string.
variable _strings
proc _process_one_constant {name value} {
variable _constants
variable _AT
variable _FORM
variable _OP
set _constants($name) $value
if {![regexp "^DW_(\[A-Z\]+)_(\[A-Za-z0-9_\]+)$" $name \
ignore prefix name2]} {
error "non-matching name: $name"
}
if {$name2 == "lo_user" || $name2 == "hi_user"} {
return
}
# We only try to shorten some very common things.
# FIXME: CFA?
switch -exact -- $prefix {
TAG {
# Create two procedures for the tag. These call
# _handle_DW_TAG with the full tag name baked in; this
# does all the actual work.
proc $name {{attrs {}} {children {}}} \
"_handle_DW_TAG $name \$attrs \$children"
# Filter out ones that are known to clash.
if {$name2 == "variable" || $name2 == "namespace"} {
set name2 "tag_$name2"
}
if {[info commands $name2] != {}} {
error "duplicate proc name: from $name"
}
proc $name2 {{attrs {}} {children {}}} \
"_handle_DW_TAG $name \$attrs \$children"
}
AT {
set _AT($name2) $name
}
FORM {
set _FORM($name2) $name
}
OP {
set _OP($name2) $name
}
default {
return
}
}
}
proc _read_constants {} {
global srcdir hex decimal
variable _constants
# DWARF name-matching regexp.
set dwrx "DW_\[a-zA-Z0-9_\]+"
# Whitespace regexp.
set ws "\[ \t\]+"
set fd [open [file join $srcdir .. .. include dwarf2.h]]
while {![eof $fd]} {
set line [gets $fd]
if {[regexp -- "^${ws}($dwrx)${ws}=${ws}($hex|$decimal),?$" \
$line ignore name value ignore2]} {
_process_one_constant $name $value
}
}
close $fd
set fd [open [file join $srcdir .. .. include dwarf2.def]]
while {![eof $fd]} {
set line [gets $fd]
if {[regexp -- \
"^DW_\[A-Z_\]+${ws}\\(($dwrx),${ws}($hex|$decimal)\\)$" \
$line ignore name value ignore2]} {
_process_one_constant $name $value
}
}
close $fd
set _constants(SPECIAL_expr) $_constants(DW_FORM_block)
}
proc _quote {string} {
# FIXME
return "\"${string}\\0\""
}
proc _nz_quote {string} {
# For now, no quoting is done.
return "\"${string}\""
}
proc _handle_DW_FORM {form value} {
switch -exact -- $form {
DW_FORM_string {
_op .ascii [_quote $value]
}
DW_FORM_flag_present {
# We don't need to emit anything.
}
DW_FORM_data4 -
DW_FORM_ref4 {
_op .4byte $value
}
DW_FORM_ref_addr {
variable _cu_offset_size
variable _cu_version
variable _cu_addr_size
if {$_cu_version == 2} {
set size $_cu_addr_size
} else {
set size $_cu_offset_size
}
_op .${size}byte $value
}
DW_FORM_ref1 -
DW_FORM_flag -
DW_FORM_data1 {
_op .byte $value
}
DW_FORM_sdata {
_op .sleb128 $value
}
DW_FORM_ref_udata -
DW_FORM_udata {
_op .uleb128 $value
}
DW_FORM_addr {
variable _cu_addr_size
_op .${_cu_addr_size}byte $value
}
DW_FORM_data2 -
DW_FORM_ref2 {
_op .2byte $value
}
DW_FORM_data8 -
DW_FORM_ref8 -
DW_FORM_ref_sig8 {
_op .8byte $value
}
DW_FORM_strp {
variable _strings
variable _cu_offset_size
if {![info exists _strings($value)]} {
set _strings($value) [new_label strp]
_defer_output .debug_string {
define_label $_strings($value)
_op .ascii [_quote $value]
}
}
_op .${_cu_offset_size}byte $_strings($value) "strp: $value"
}
SPECIAL_expr {
set l1 [new_label "expr_start"]
set l2 [new_label "expr_end"]
_op .uleb128 "$l2 - $l1" "expression"
define_label $l1
_location $value
define_label $l2
}
DW_FORM_block1 {
set len [string length $value]
if {$len > 255} {
error "DW_FORM_block1 length too long"
}
_op .byte $len
_op .ascii [_nz_quote $value]
}
DW_FORM_block2 -
DW_FORM_block4 -
DW_FORM_block -
DW_FORM_ref2 -
DW_FORM_indirect -
DW_FORM_sec_offset -
DW_FORM_exprloc -
DW_FORM_GNU_addr_index -
DW_FORM_GNU_str_index -
DW_FORM_GNU_ref_alt -
DW_FORM_GNU_strp_alt -
default {
error "unhandled form $form"
}
}
}
proc _guess_form {value varname} {
upvar $varname new_value
switch -exact -- [string range $value 0 0] {
@ {
# Constant reference.
variable _constants
set new_value $_constants([string range $value 1 end])
# Just the simplest.
return DW_FORM_sdata
}
: {
# Label reference.
variable _cu_label
set new_value "[string range $value 1 end] - $_cu_label"
return DW_FORM_ref4
}
default {
return DW_FORM_string
}
}
}
# Map NAME to its canonical form.
proc _map_name {name ary} {
variable $ary
if {[info exists ${ary}($name)]} {
set name [set ${ary}($name)]
}
return $name
}
proc _handle_DW_TAG {tag_name {attrs {}} {children {}}} {
variable _abbrev_section
variable _abbrev_num
variable _constants
set has_children [expr {[string length $children] > 0}]
set my_abbrev [incr _abbrev_num]
# We somewhat wastefully emit a new abbrev entry for each tag.
# There's no reason for this other than laziness.
_defer_output $_abbrev_section {
_op .uleb128 $my_abbrev "Abbrev start"
_op .uleb128 $_constants($tag_name) $tag_name
_op .byte $has_children "has_children"
}
_op .uleb128 $my_abbrev "Abbrev ($tag_name)"
foreach attr $attrs {
set attr_name [_map_name [lindex $attr 0] _AT]
set attr_value [uplevel 2 [list subst [lindex $attr 1]]]
if {[llength $attr] > 2} {
set attr_form [lindex $attr 2]
} else {
set attr_form [_guess_form $attr_value attr_value]
}
set attr_form [_map_name $attr_form _FORM]
_handle_DW_FORM $attr_form $attr_value
_defer_output $_abbrev_section {
_op .uleb128 $_constants($attr_name) $attr_name
_op .uleb128 $_constants($attr_form) $attr_form
}
}
_defer_output $_abbrev_section {
# Terminator.
_op .byte 0x0 Terminator
_op .byte 0x0 Terminator
}
if {$has_children} {
uplevel 2 $children
# Terminate children.
_op .byte 0x0 "Terminate children"
}
}
proc _emit {string} {
variable _output_file
variable _defer
variable _deferred_output
if {$_defer == ""} {
puts $_output_file $string
} else {
append _deferred_output($_defer) ${string}\n
}
}
proc _section {name {flags ""} {type ""}} {
if {$flags == "" && $type == ""} {
_emit " .section $name"
} elseif {$type == ""} {
_emit " .section $name, \"$flags\""
} else {
_emit " .section $name, \"$flags\", %$type"
}
}
# SECTION_SPEC is a list of arguments to _section.
proc _defer_output {section_spec body} {
variable _defer
variable _deferred_output
set old_defer $_defer
set _defer [lindex $section_spec 0]
if {![info exists _deferred_output($_defer)]} {
set _deferred_output($_defer) ""
eval _section $section_spec
}
uplevel $body
set _defer $old_defer
}
proc _defer_to_string {body} {
variable _defer
variable _deferred_output
set old_defer $_defer
set _defer temp
set _deferred_output($_defer) ""
uplevel $body
set result $_deferred_output($_defer)
unset _deferred_output($_defer)
set _defer $old_defer
return $result
}
proc _write_deferred_output {} {
variable _output_file
variable _deferred_output
foreach section [array names _deferred_output] {
# The data already has a newline.
puts -nonewline $_output_file $_deferred_output($section)
}
# Save some memory.
unset _deferred_output
}
proc _op {name value {comment ""}} {
set text " ${name} ${value}"
if {$comment != ""} {
# Try to make stuff line up nicely.
while {[string length $text] < 40} {
append text " "
}
append text "/* ${comment} */"
}
_emit $text
}
proc _compute_label {name} {
return ".L${name}"
}
# Return a name suitable for use as a label. If BASE_NAME is
# specified, it is incorporated into the label name; this is to
# make debugging the generated assembler easier. If BASE_NAME is
# not specified a generic default is used. This proc does not
# define the label; see 'define_label'. 'new_label' attempts to
# ensure that label names are unique.
proc new_label {{base_name label}} {
variable _label_num
return [_compute_label ${base_name}[incr _label_num]]
}
# Define a label named NAME. Ordinarily, NAME comes from a call
# to 'new_label', but this is not required.
proc define_label {name} {
_emit "${name}:"
}
# Declare a global label. This is typically used to refer to
# labels defined in other files, for example a function defined in
# a .c file.
proc extern {args} {
foreach name $args {
_op .global $name
}
}
# A higher-level interface to label handling.
#
# ARGS is a list of label descriptors. Each one is either a
# single element, or a list of two elements -- a name and some
# text. For each descriptor, 'new_label' is invoked. If the list
# form is used, the second element in the list is passed as an
# argument. The label name is used to define a variable in the
# enclosing scope; this can be used to refer to the label later.
# The label name is also used to define a new proc whose name is
# the label name plus a trailing ":". This proc takes a body as
# an argument and can be used to define the label at that point;
# then the body, if any, is evaluated in the caller's context.
#
# For example:
#
# declare_labels int_label
# something { ... $int_label } ;# refer to the label
# int_label: constant { ... } ;# define the label
proc declare_labels {args} {
foreach arg $args {
set name [lindex $arg 0]
set text [lindex $arg 1]
upvar $name label_var
if {$text == ""} {
set label_var [new_label]
} else {
set label_var [new_label $text]
}
proc ${name}: {args} [format {
define_label %s
uplevel $args
} $label_var]
}
}
# This is a miniature assembler for location expressions. It is
# suitable for use in the attributes to a DIE. Its output is
# prefixed with "=" to make it automatically use DW_FORM_block.
# BODY is split by lines, and each line is taken to be a list.
# (FIXME should use 'info complete' here.)
# Each list's first element is the opcode, either short or long
# forms are accepted.
# FIXME argument handling
# FIXME move docs
proc _location {body} {
variable _constants
variable _cu_label
variable _cu_addr_size
variable _cu_offset_size
foreach line [split $body \n] {
if {[lindex $line 0] == ""} {
continue
}
set opcode [_map_name [lindex $line 0] _OP]
_op .byte $_constants($opcode) $opcode
switch -exact -- $opcode {
DW_OP_addr {
_op .${_cu_addr_size}byte [lindex $line 1]
}
DW_OP_const1u -
DW_OP_const1s {
_op .byte [lindex $line 1]
}
DW_OP_const2u -
DW_OP_const2s {
_op .2byte [lindex $line 1]
}
DW_OP_const4u -
DW_OP_const4s {
_op .4byte [lindex $line 1]
}
DW_OP_const8u -
DW_OP_const8s {
_op .8byte [lindex $line 1]
}
DW_OP_constu {
_op .uleb128 [lindex $line 1]
}
DW_OP_consts {
_op .sleb128 [lindex $line 1]
}
DW_OP_plus_uconst {
_op .uleb128 [lindex $line 1]
}
DW_OP_piece {
_op .uleb128 [lindex $line 1]
}
DW_OP_bit_piece {
_op .uleb128 [lindex $line 1]
_op .uleb128 [lindex $line 2]
}
DW_OP_GNU_implicit_pointer {
if {[llength $line] != 3} {
error "usage: DW_OP_GNU_implicit_pointer LABEL OFFSET"
}
# Here label is a section offset.
set label [lindex $line 1]
_op .${_cu_offset_size}byte $label
_op .sleb128 [lindex $line 2]
}
DW_OP_deref_size {
if {[llength $line] != 2} {
error "usage: DW_OP_deref_size SIZE"
}
_op .byte [lindex $line 1]
}
default {
if {[llength $line] > 1} {
error "Unimplemented: operands in location for $opcode"
}
}
}
}
}
# Emit a DWARF CU.
# OPTIONS is a list with an even number of elements containing
# option-name and option-value pairs.
# Current options are:
# is_64 0|1 - boolean indicating if you want to emit 64-bit DWARF
# default = 0 (32-bit)
# version n - DWARF version number to emit
# default = 4
# addr_size n - the size of addresses, 32, 64, or default
# default = default
# fission 0|1 - boolean indicating if generating Fission debug info
# default = 0
# BODY is Tcl code that emits the DIEs which make up the body of
# the CU. It is evaluated in the caller's context.
proc cu {options body} {
variable _cu_count
variable _abbrev_section
variable _abbrev_num
variable _cu_label
variable _cu_version
variable _cu_addr_size
variable _cu_offset_size
# Establish the defaults.
set is_64 0
set _cu_version 4
set _cu_addr_size default
set fission 0
set section ".debug_info"
set _abbrev_section ".debug_abbrev"
foreach { name value } $options {
switch -exact -- $name {
is_64 { set is_64 $value }
version { set _cu_version $value }
addr_size { set _cu_addr_size $value }
fission { set fission $value }
default { error "unknown option $name" }
}
}
if {$_cu_addr_size == "default"} {
if {[is_64_target]} {
set _cu_addr_size 8
} else {
set _cu_addr_size 4
}
}
set _cu_offset_size [expr { $is_64 ? 8 : 4 }]
if { $fission } {
set section ".debug_info.dwo"
set _abbrev_section ".debug_abbrev.dwo"
}
_section $section
set cu_num [incr _cu_count]
set my_abbrevs [_compute_label "abbrev${cu_num}_begin"]
set _abbrev_num 1
set _cu_label [_compute_label "cu${cu_num}_begin"]
set start_label [_compute_label "cu${cu_num}_start"]
set end_label [_compute_label "cu${cu_num}_end"]
define_label $_cu_label
if {$is_64} {
_op .4byte 0xffffffff
_op .8byte "$end_label - $start_label"
} else {
_op .4byte "$end_label - $start_label"
}
define_label $start_label
_op .2byte $_cu_version Version
_op .4byte $my_abbrevs Abbrevs
_op .byte $_cu_addr_size "Pointer size"
_defer_output $_abbrev_section {
define_label $my_abbrevs
}
uplevel $body
_defer_output $_abbrev_section {
# Emit the terminator.
_op .byte 0x0 Terminator
_op .byte 0x0 Terminator
}
define_label $end_label
}
# Emit a DWARF TU.
# OPTIONS is a list with an even number of elements containing
# option-name and option-value pairs.
# Current options are:
# is_64 0|1 - boolean indicating if you want to emit 64-bit DWARF
# default = 0 (32-bit)
# version n - DWARF version number to emit
# default = 4
# addr_size n - the size of addresses, 32, 64, or default
# default = default
# fission 0|1 - boolean indicating if generating Fission debug info
# default = 0
# SIGNATURE is the 64-bit signature of the type.
# TYPE_LABEL is the label of the type defined by this TU,
# or "" if there is no type (i.e., type stubs in Fission).
# BODY is Tcl code that emits the DIEs which make up the body of
# the TU. It is evaluated in the caller's context.
proc tu {options signature type_label body} {
variable _cu_count
variable _abbrev_section
variable _abbrev_num
variable _cu_label
variable _cu_version
variable _cu_addr_size
variable _cu_offset_size
# Establish the defaults.
set is_64 0
set _cu_version 4
set _cu_addr_size default
set fission 0
set section ".debug_types"
set _abbrev_section ".debug_abbrev"
foreach { name value } $options {
switch -exact -- $name {
is_64 { set is_64 $value }
version { set _cu_version $value }
addr_size { set _cu_addr_size $value }
fission { set fission $value }
default { error "unknown option $name" }
}
}
if {$_cu_addr_size == "default"} {
if {[is_64_target]} {
set _cu_addr_size 8
} else {
set _cu_addr_size 4
}
}
set _cu_offset_size [expr { $is_64 ? 8 : 4 }]
if { $fission } {
set section ".debug_types.dwo"
set _abbrev_section ".debug_abbrev.dwo"
}
_section $section
set cu_num [incr _cu_count]
set my_abbrevs [_compute_label "abbrev${cu_num}_begin"]
set _abbrev_num 1
set _cu_label [_compute_label "cu${cu_num}_begin"]
set start_label [_compute_label "cu${cu_num}_start"]
set end_label [_compute_label "cu${cu_num}_end"]
define_label $_cu_label
if {$is_64} {
_op .4byte 0xffffffff
_op .8byte "$end_label - $start_label"
} else {
_op .4byte "$end_label - $start_label"
}
define_label $start_label
_op .2byte $_cu_version Version
_op .4byte $my_abbrevs Abbrevs
_op .byte $_cu_addr_size "Pointer size"
_op .8byte $signature Signature
if { $type_label != "" } {
uplevel declare_labels $type_label
upvar $type_label my_type_label
if {$is_64} {
_op .8byte "$my_type_label - $_cu_label"
} else {
_op .4byte "$my_type_label - $_cu_label"
}
} else {
if {$is_64} {
_op .8byte 0
} else {
_op .4byte 0
}
}
_defer_output $_abbrev_section {
define_label $my_abbrevs
}
uplevel $body
_defer_output $_abbrev_section {
# Emit the terminator.
_op .byte 0x0 Terminator
_op .byte 0x0 Terminator
}
define_label $end_label
}
proc _empty_array {name} {
upvar $name the_array
catch {unset the_array}
set the_array(_) {}
unset the_array(_)
}
# Emit a .gnu_debugaltlink section with the given file name and
# build-id. The buildid should be represented as a hexadecimal
# string, like "ffeeddcc".
proc gnu_debugaltlink {filename buildid} {
_defer_output .gnu_debugaltlink {
_op .ascii [_quote $filename]
foreach {a b} [split $buildid {}] {
_op .byte 0x$a$b
}
}
}
proc _note {type name hexdata} {
set namelen [expr [string length $name] + 1]
# Name size.
_op .4byte $namelen
# Data size.
_op .4byte [expr [string length $hexdata] / 2]
# Type.
_op .4byte $type
# The name.
_op .ascii [_quote $name]
# Alignment.
set align 2
set total [expr {($namelen + (1 << $align) - 1) & (-1 << $align)}]
for {set i $namelen} {$i < $total} {incr i} {
_op .byte 0
}
# The data.
foreach {a b} [split $hexdata {}] {
_op .byte 0x$a$b
}
}
# Emit a note section holding the given build-id.
proc build_id {buildid} {
_defer_output {.note.gnu.build-id a note} {
# From elf/common.h.
set NT_GNU_BUILD_ID 3
_note $NT_GNU_BUILD_ID GNU $buildid
}
}
# The top-level interface to the DWARF assembler.
# FILENAME is the name of the file where the generated assembly
# code is written.
# BODY is Tcl code to emit the assembly. It is evaluated via
# "eval" -- not uplevel as you might expect, because it is
# important to run the body in the Dwarf namespace.
#
# A typical invocation is something like:
# Dwarf::assemble $file {
# cu 0 2 8 {
# compile_unit {
# ...
# }
# }
# cu 0 2 8 {
# ...
# }
# }
proc assemble {filename body} {
variable _initialized
variable _output_file
variable _deferred_output
variable _defer
variable _label_num
variable _strings
variable _cu_count
if {!$_initialized} {
_read_constants
set _initialized 1
}
set _output_file [open $filename w]
set _cu_count 0
_empty_array _deferred_output
set _defer ""
set _label_num 0
_empty_array _strings
# Not "uplevel" here, because we want to evaluate in this
# namespace. This is somewhat bad because it means we can't
# readily refer to outer variables.
eval $body
_write_deferred_output
catch {close $_output_file}
set _output_file {}
}
}
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