1062 lines
26 KiB
Plaintext
1062 lines
26 KiB
Plaintext
# Copyright 2010-2014 Free Software Foundation, Inc.
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# This program is free software; you can redistribute it and/or modify
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# it under the terms of the GNU General Public License as published by
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# the Free Software Foundation; either version 3 of the License, or
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# (at your option) any later version.
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#
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# This program is distributed in the hope that it will be useful,
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# but WITHOUT ANY WARRANTY; without even the implied warranty of
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# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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# GNU General Public License for more details.
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#
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# You should have received a copy of the GNU General Public License
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# along with this program. If not, see <http://www.gnu.org/licenses/>.
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# Return true if the target supports DWARF-2 and uses gas.
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# For now pick a sampling of likely targets.
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proc dwarf2_support {} {
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if {[istarget *-*-linux*]
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|| [istarget *-*-gnu*]
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|| [istarget *-*-elf*]
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|| [istarget *-*-openbsd*]
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|| [istarget arm*-*-eabi*]
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|| [istarget arm*-*-symbianelf*]
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|| [istarget powerpc-*-eabi*]} {
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return 1
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}
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return 0
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}
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# Build an executable from a fission-based .S file.
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# This handles the extra work of splitting the .o into non-dwo and dwo
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# pieces, making sure the .dwo is available if we're using cc-with-tweaks.sh
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# to build a .dwp file.
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# The arguments and results are the same as for build_executable.
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#
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# Current restrictions:
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# - only supports one source file
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# - cannot be run on remote hosts
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proc build_executable_from_fission_assembler { testname executable sources options } {
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verbose -log "build_executable_from_fission_assembler $testname $executable $sources $options"
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if { [llength $sources] != 1 } {
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error "Only one source file supported."
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}
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if [is_remote host] {
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error "Remote hosts are not supported."
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}
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global srcdir subdir
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set source_file ${srcdir}/${subdir}/${sources}
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set root_name [file rootname [file tail $source_file]]
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set output_base [standard_output_file $root_name]
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set object_file ${output_base}.o
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set dwo_file ${output_base}.dwo
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set object_options "object $options"
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set objcopy [gdb_find_objcopy]
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set result [gdb_compile $source_file $object_file object $options]
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if { "$result" != "" } {
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return -1
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}
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set command "$objcopy --extract-dwo $object_file $dwo_file"
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verbose -log "Executing $command"
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set result [catch "exec $command" output]
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verbose -log "objcopy --extract-dwo output: $output"
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if { $result == 1 } {
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return -1
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}
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set command "$objcopy --strip-dwo $object_file"
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verbose -log "Executing $command"
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set result [catch "exec $command" output]
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verbose -log "objcopy --strip-dwo output: $output"
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if { $result == 1 } {
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return -1
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}
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set result [gdb_compile $object_file $executable executable {nodebug}]
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if { "$result" != "" } {
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return -1
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}
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return 0
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}
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# A DWARF assembler.
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#
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# All the variables in this namespace are private to the
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# implementation. Also, any procedure whose name starts with "_" is
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# private as well. Do not use these.
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#
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# Exported functions are documented at their definition.
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#
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# In addition to the hand-written functions documented below, this
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# module automatically generates a function for each DWARF tag. For
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# most tags, two forms are made: a full name, and one with the
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# "DW_TAG_" prefix stripped. For example, you can use either
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# 'DW_TAG_compile_unit' or 'compile_unit' interchangeably.
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#
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# There are two exceptions to this rule: DW_TAG_variable and
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# DW_TAG_namespace. For these, the full name must always be used,
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# as the short name conflicts with Tcl builtins. (Should future
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# versions of Tcl or DWARF add more conflicts, this list will grow.
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# If you want to be safe you should always use the full names.)
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#
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# Each tag procedure is defined like:
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#
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# proc DW_TAG_mumble {{attrs {}} {children {}}} { ... }
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#
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# ATTRS is an optional list of attributes.
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# It is run through 'subst' in the caller's context before processing.
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#
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# Each attribute in the list has one of two forms:
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# 1. { NAME VALUE }
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# 2. { NAME VALUE FORM }
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#
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# In each case, NAME is the attribute's name.
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# This can either be the full name, like 'DW_AT_name', or a shortened
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# name, like 'name'. These are fully equivalent.
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#
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# If FORM is given, it should name a DW_FORM_ constant.
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# This can either be the short form, like 'DW_FORM_addr', or a
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# shortened version, like 'addr'. If the form is given, VALUE
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# is its value; see below. In some cases, additional processing
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# is done; for example, DW_FORM_strp manages the .debug_str
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# section automatically.
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#
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# If FORM is 'SPECIAL_expr', then VALUE is treated as a location
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# expression. The effective form is then DW_FORM_block, and VALUE
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# is passed to the (internal) '_location' proc to be translated.
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# This proc implements a miniature DW_OP_ assembler.
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#
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# If FORM is not given, it is guessed:
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# * If VALUE starts with the "@" character, the rest of VALUE is
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# looked up as a DWARF constant, and DW_FORM_sdata is used. For
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# example, '@DW_LANG_c89' could be used.
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# * If VALUE starts with the ":" character, then it is a label
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# reference. The rest of VALUE is taken to be the name of a label,
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# and DW_FORM_ref4 is used. See 'new_label' and 'define_label'.
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# * Otherwise, VALUE is taken to be a string and DW_FORM_string is
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# used.
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# More form-guessing functionality may be added.
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#
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# CHILDREN is just Tcl code that can be used to define child DIEs. It
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# is evaluated in the caller's context.
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#
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# Currently this code is missing nice support for CFA handling, and
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# probably other things as well.
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namespace eval Dwarf {
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# True if the module has been initialized.
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variable _initialized 0
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# Constants from dwarf2.h.
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variable _constants
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# DW_AT short names.
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variable _AT
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# DW_FORM short names.
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variable _FORM
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# DW_OP short names.
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variable _OP
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# The current output file.
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variable _output_file
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# Note: The _cu_ values here also apply to type units (TUs).
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# Think of a TU as a special kind of CU.
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# Current CU count.
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variable _cu_count
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# The current CU's base label.
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variable _cu_label
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# The current CU's version.
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variable _cu_version
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# The current CU's address size.
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variable _cu_addr_size
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# The current CU's offset size.
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variable _cu_offset_size
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# Label generation number.
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variable _label_num
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# The deferred output array. The index is the section name; the
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# contents hold the data for that section.
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variable _deferred_output
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# If empty, we should write directly to the output file.
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# Otherwise, this is the name of a section to write to.
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variable _defer
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# The abbrev section. Typically .debug_abbrev but can be .debug_abbrev.dwo
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# for Fission.
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variable _abbrev_section
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# The next available abbrev number in the current CU's abbrev
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# table.
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variable _abbrev_num
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# The string table for this assembly. The key is the string; the
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# value is the label for that string.
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variable _strings
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proc _process_one_constant {name value} {
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variable _constants
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variable _AT
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variable _FORM
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variable _OP
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set _constants($name) $value
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if {![regexp "^DW_(\[A-Z\]+)_(\[A-Za-z0-9_\]+)$" $name \
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ignore prefix name2]} {
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error "non-matching name: $name"
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}
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if {$name2 == "lo_user" || $name2 == "hi_user"} {
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return
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}
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# We only try to shorten some very common things.
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# FIXME: CFA?
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switch -exact -- $prefix {
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TAG {
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# Create two procedures for the tag. These call
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# _handle_DW_TAG with the full tag name baked in; this
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# does all the actual work.
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proc $name {{attrs {}} {children {}}} \
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"_handle_DW_TAG $name \$attrs \$children"
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# Filter out ones that are known to clash.
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if {$name2 == "variable" || $name2 == "namespace"} {
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set name2 "tag_$name2"
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}
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if {[info commands $name2] != {}} {
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error "duplicate proc name: from $name"
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}
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proc $name2 {{attrs {}} {children {}}} \
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"_handle_DW_TAG $name \$attrs \$children"
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}
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AT {
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set _AT($name2) $name
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}
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FORM {
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set _FORM($name2) $name
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}
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OP {
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set _OP($name2) $name
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}
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default {
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return
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}
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}
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}
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proc _read_constants {} {
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global srcdir hex decimal
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variable _constants
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# DWARF name-matching regexp.
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set dwrx "DW_\[a-zA-Z0-9_\]+"
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# Whitespace regexp.
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set ws "\[ \t\]+"
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set fd [open [file join $srcdir .. .. include dwarf2.h]]
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while {![eof $fd]} {
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set line [gets $fd]
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if {[regexp -- "^${ws}($dwrx)${ws}=${ws}($hex|$decimal),?$" \
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$line ignore name value ignore2]} {
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_process_one_constant $name $value
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}
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}
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close $fd
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set fd [open [file join $srcdir .. .. include dwarf2.def]]
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while {![eof $fd]} {
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set line [gets $fd]
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if {[regexp -- \
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"^DW_\[A-Z_\]+${ws}\\(($dwrx),${ws}($hex|$decimal)\\)$" \
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$line ignore name value ignore2]} {
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_process_one_constant $name $value
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}
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}
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close $fd
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set _constants(SPECIAL_expr) $_constants(DW_FORM_block)
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}
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proc _quote {string} {
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# FIXME
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return "\"${string}\\0\""
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}
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proc _nz_quote {string} {
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# For now, no quoting is done.
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return "\"${string}\""
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}
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proc _handle_DW_FORM {form value} {
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switch -exact -- $form {
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DW_FORM_string {
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_op .ascii [_quote $value]
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}
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DW_FORM_flag_present {
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# We don't need to emit anything.
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}
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DW_FORM_data4 -
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DW_FORM_ref4 {
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_op .4byte $value
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}
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DW_FORM_ref_addr {
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variable _cu_offset_size
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variable _cu_version
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variable _cu_addr_size
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if {$_cu_version == 2} {
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set size $_cu_addr_size
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} else {
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set size $_cu_offset_size
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}
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_op .${size}byte $value
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}
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DW_FORM_ref1 -
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DW_FORM_flag -
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DW_FORM_data1 {
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_op .byte $value
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}
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DW_FORM_sdata {
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_op .sleb128 $value
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}
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DW_FORM_ref_udata -
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DW_FORM_udata {
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_op .uleb128 $value
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}
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DW_FORM_addr {
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variable _cu_addr_size
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_op .${_cu_addr_size}byte $value
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}
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DW_FORM_data2 -
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DW_FORM_ref2 {
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_op .2byte $value
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}
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DW_FORM_data8 -
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DW_FORM_ref8 -
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DW_FORM_ref_sig8 {
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_op .8byte $value
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}
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DW_FORM_strp {
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variable _strings
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variable _cu_offset_size
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if {![info exists _strings($value)]} {
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set _strings($value) [new_label strp]
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_defer_output .debug_string {
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define_label $_strings($value)
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_op .ascii [_quote $value]
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}
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}
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_op .${_cu_offset_size}byte $_strings($value) "strp: $value"
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}
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SPECIAL_expr {
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set l1 [new_label "expr_start"]
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set l2 [new_label "expr_end"]
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_op .uleb128 "$l2 - $l1" "expression"
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define_label $l1
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_location $value
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define_label $l2
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}
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DW_FORM_block1 {
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set len [string length $value]
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if {$len > 255} {
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error "DW_FORM_block1 length too long"
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}
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_op .byte $len
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_op .ascii [_nz_quote $value]
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}
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DW_FORM_block2 -
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DW_FORM_block4 -
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DW_FORM_block -
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DW_FORM_ref2 -
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DW_FORM_indirect -
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DW_FORM_sec_offset -
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DW_FORM_exprloc -
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DW_FORM_GNU_addr_index -
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DW_FORM_GNU_str_index -
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DW_FORM_GNU_ref_alt -
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DW_FORM_GNU_strp_alt -
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default {
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error "unhandled form $form"
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}
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}
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}
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proc _guess_form {value varname} {
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upvar $varname new_value
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switch -exact -- [string range $value 0 0] {
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@ {
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# Constant reference.
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variable _constants
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set new_value $_constants([string range $value 1 end])
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# Just the simplest.
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return DW_FORM_sdata
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}
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: {
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# Label reference.
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variable _cu_label
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set new_value "[string range $value 1 end] - $_cu_label"
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return DW_FORM_ref4
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}
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default {
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return DW_FORM_string
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}
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}
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}
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# Map NAME to its canonical form.
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proc _map_name {name ary} {
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variable $ary
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if {[info exists ${ary}($name)]} {
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set name [set ${ary}($name)]
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}
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return $name
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}
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proc _handle_DW_TAG {tag_name {attrs {}} {children {}}} {
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variable _abbrev_section
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variable _abbrev_num
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variable _constants
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set has_children [expr {[string length $children] > 0}]
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set my_abbrev [incr _abbrev_num]
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# We somewhat wastefully emit a new abbrev entry for each tag.
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# There's no reason for this other than laziness.
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_defer_output $_abbrev_section {
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_op .uleb128 $my_abbrev "Abbrev start"
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_op .uleb128 $_constants($tag_name) $tag_name
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_op .byte $has_children "has_children"
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}
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_op .uleb128 $my_abbrev "Abbrev ($tag_name)"
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foreach attr $attrs {
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set attr_name [_map_name [lindex $attr 0] _AT]
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set attr_value [uplevel 2 [list subst [lindex $attr 1]]]
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if {[llength $attr] > 2} {
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set attr_form [lindex $attr 2]
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} else {
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set attr_form [_guess_form $attr_value attr_value]
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}
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set attr_form [_map_name $attr_form _FORM]
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_handle_DW_FORM $attr_form $attr_value
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_defer_output $_abbrev_section {
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_op .uleb128 $_constants($attr_name) $attr_name
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_op .uleb128 $_constants($attr_form) $attr_form
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}
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}
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_defer_output $_abbrev_section {
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# Terminator.
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_op .byte 0x0 Terminator
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_op .byte 0x0 Terminator
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}
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if {$has_children} {
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uplevel 2 $children
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# Terminate children.
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_op .byte 0x0 "Terminate children"
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}
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}
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proc _emit {string} {
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variable _output_file
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variable _defer
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variable _deferred_output
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if {$_defer == ""} {
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puts $_output_file $string
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} else {
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append _deferred_output($_defer) ${string}\n
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}
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}
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proc _section {name {flags ""} {type ""}} {
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if {$flags == "" && $type == ""} {
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_emit " .section $name"
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} elseif {$type == ""} {
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_emit " .section $name, \"$flags\""
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} else {
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_emit " .section $name, \"$flags\", %$type"
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}
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}
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# SECTION_SPEC is a list of arguments to _section.
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proc _defer_output {section_spec body} {
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variable _defer
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variable _deferred_output
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set old_defer $_defer
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set _defer [lindex $section_spec 0]
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if {![info exists _deferred_output($_defer)]} {
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set _deferred_output($_defer) ""
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eval _section $section_spec
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}
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uplevel $body
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set _defer $old_defer
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}
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proc _defer_to_string {body} {
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variable _defer
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variable _deferred_output
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set old_defer $_defer
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set _defer temp
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set _deferred_output($_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 {}
|
|
}
|
|
}
|