On 09/08/2016 06:30 PM, David Malcolm wrote:
This patch generalizes the RTL-reading capabilities so that they
can be run on the host as well as the build machine.
The available rtx in rtl.def changes dramatically between these
two configurations, so a fair amount of #ifdef GENERATOR_FILE is
required to express this.
This patch introduces a function_reader subclass of rtx_reader,
capable of reading an RTL function dump (or part of one),
reconstructing a cfun with a CFG and basic blocks containing insns.
gcc/ChangeLog:
* Makefile.in (OBJS): Add errors.o, read-md.o, read-rtl.o,
read-rtl-function.o, and selftest-rtl.o.
* cfgexpand.c (pass_expand::execute): Move stack initializations
to rtl_data::init_stack_alignment and call it. Pass "true"
for new "emit_insns" param of expand_function_start.
* emit-rtl.c (gen_reg_rtx): Move regno_pointer_align and
regno_reg_rtx resizing logic to...
(emit_status::ensure_regno_capacity): ...this new method.
(init_emit): Allocate regno_reg_rtx using ggc_cleared_vec_alloc
rather than ggc_vec_alloc.
(rtl_data::init_stack_alignment): New method.
(get_insn_by_uid): New function.
* emit-rtl.h (rtl_data::init_stack_alignment): New method.
* errors.c: Use consistent pattern for bconfig.h vs config.h
includes.
(progname): Wrap with #ifdef GENERATOR_FILE.
(error): Likewise. Add "error: " to message.
(fatal): Likewise.
(internal_error): Likewise.
(trim_filename): Likewise.
(fancy_abort): Likewise.
* errors.h (struct file_location): Move here from read-md.h.
(file_location::file_location): Likewise.
(error_at): New decl.
* function-tests.c (selftest::verify_three_block_rtl_cfg): Remove
"static".
* function.c (instantiate_decls): Guard call to
instantiate_decls_1 with if (DECL_INITIAL (fndecl)).
(expand_function_start): Add param "emit_insns", and use it to
guard the various gen/emit calls.
* function.h (emit_status::ensure_regno_capacity): New method.
(expand_function_start): Add bool param to decl.
* gensupport.c (gen_reader::gen_reader): Add NULL for new policy
param of rtx_reader ctor.
* print-rtl.c (print_rtx): Print "(nil)" rather than an empty
string for NULL strings. Print "(nil)" for NULL basic blocks.
* read-md.c (read_skip_construct): Provide forward decl.
(read_skip_spaces): Support '/'.
(require_char): New function.
(require_word_ws): New function.
(peek_char): New function.
(read_name): Rename to...
(read_name_1): ...this new static function, adding "out_loc" param,
and converting "missing name or number" to returning false, rather
than failing.
(read_name): Reimplement in terms of read_name_1.
(read_name_or_nil): New function.
(read_string): Handle "(nil)" by returning NULL. */
(rtx_reader::rtx_reader): Add rtl_reader_policy * param, using
it to initialize m_policy.
(rtx_reader::~rtx_reader): Free m_base_dir. Clean up global data.
* read-md.h (struct file_location): Move to errors.h.
(file_location::file_location): Likewise.
Include errors.h.
(class regno_remapper): New class.
(struct rtl_reader_policy): New struct.
(rtx_reader::rtx_reader): Add rtl_reader_policy * param.
(rtx_reader::add_fixup_insn_uid): New vfunc.
(rtx_reader::add_fixup_bb): New vfunc.
(rtx_reader::add_fixup_note_insn_basic_block): New vfunc.
(rtx_reader::add_fixup_source_location): New vfunc.
(rtx_reader::add_fixup_jump_label): New vfunc.
(rtx_reader::add_fixup_expr): New vfunc.
(rtx_reader::remap_regno): New method.
(rtx_reader::m_policy): New field.
(noop_reader::noop_reader): Add NULL for new policy param of
rtx_reader ctor.
(peek_char): New decl.
(require_char): New decl.
(require_word_ws): New decl.
(read_name): Convert return type from void to file_location.
(read_name_or_nil): New decl.
* read-rtl-function.c: New file.
* read-rtl-function.h: New file.
* read-rtl.c: Potentially include config.h rather than bconfig.h.
For host, include function.h and emit-rtl.h.
(apply_subst_iterator): Wrap with #ifdef GENERATOR_FILE.
(bind_subst_iter_and_attr): Likewise.
(add_condition_to_string): Likewise.
(add_condition_to_rtx): Likewise.
(apply_attribute_uses): Likewise.
(add_current_iterators): Likewise.
(apply_iterators): Likewise.
(initialize_iterators): Guard usage of apply_subst_iterator with
#ifdef GENERATOR_FILE.
(read_conditions): Wrap with #ifdef GENERATOR_FILE.
(read_mapping): Likewise.
(add_define_attr_for_define_subst): Likewise.
(add_define_subst_attr): Likewise.
(read_subst_mapping): Likewise.
(check_code_iterator): Likewise.
(read_rtx): Likewise. Move one-time initialization logic to...
(one_time_initialization): New function.
(parse_reg_note_name): New function.
(parse_note_insn_name): New function.
(maybe_read_location): New function.
(read_until): New function.
(strip_trailing_whitespace): New function.
(read_flags): New function.
(regno_remapper::get_effective_regno): New method.
(rtx_reader::remap_regno): New method.
(read_rtx_code): Remove "static". Initialize "iterator" to NULL.
Call one_time_initialization. Wrap iterator lookup within
#ifdef GENERATOR_FILE. Add parsing support for RTL dumps,
mirroring the special-cases in print_rtx, by calling
read_flags, reading SYMBOL_REF data, REG_NOTE names,
INSN_UID values, note-specific data, basic block IDs,
jump labels, hexdump values of wide ints, REG_EXPR, MEM_EXPR,
skipping recognized insn names, remapping register numbers.
When on host, reallocate XSTR and XTMPL fields in the GC-managed
heap.
(lookup_global_register): New function.
(consolidate_reg): New function.
(consolidate_singletons): New function.
(read_nested_rtx): Call consolidate_singletons.
* rtl.h (read_rtx): Wrap decl with #ifdef GENERATOR_FILE.
(read_rtx_code): New decl.
* selftest-rtl.c: New file.
* selftest-rtl.h: New file.
* selftest-run-tests.c (selftest::run_tests): Run
read_rtl_function_c_tests.
* selftest.h (selftest::read_rtl_function_c_tests): New decl.
* tree-dfa.c (ssa_default_def): Return NULL_TREE for rtl function
dumps.
So I see a couple conceptual things going on here.
First is initialization/finalization/state handling and various fallout
items. Essentially it encompasses all changes that we can make a case
are useful cleanups and should be handled independently.
Second is all the grunt work necessary to suck in a RTL reader into the
target's cc1. The Makefile.in changes, all the GENERATOR_FILE stuff,
and of course the new rtx_reader class, regno_mapper and the like.
I think that'll allow us to spend more time looking at the raw mechanics
of how to pull in an RTL reader into cc1.
Jeff
