mirror of
https://github.com/EmbarkStudios/rust-gpu.git
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Improve custom debuginfo with aggressive deduplication.
This commit is contained in:
Eduard-Mihai Burtescu
Eduard-Mihai Burtescu
parent
779951bc8d
commit
2c2a3bc31c
@ -708,6 +708,23 @@ impl<'a, 'tcx> BuilderMethods<'a, 'tcx> for Builder<'a, 'tcx> {
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},
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);
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}
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// HACK(eddyb) remove the previous instruction if made irrelevant.
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let mut builder = self.emit();
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if let (Some(func_idx), Some(block_idx)) =
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(builder.selected_function(), builder.selected_block())
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{
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let block = &mut builder.module_mut().functions[func_idx].blocks[block_idx];
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match &block.instructions[..] {
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[.., a, b]
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if a.class.opcode == b.class.opcode
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&& a.operands[..2] == b.operands[..2] =>
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{
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block.instructions.remove(block.instructions.len() - 2);
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}
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_ => {}
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}
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}
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} else {
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// We may not always have valid spans.
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// FIXME(eddyb) reduce the sources of this as much as possible.
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@ -378,8 +378,13 @@ impl CodegenArgs {
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);
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opts.optflag(
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"",
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"spirt-keep-custom-debuginfo-in-dumps",
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"keep custom debuginfo when dumping SPIR-T (instead of lossily prettifying it)",
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"spirt-strip-custom-debuginfo-from-dumps",
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"strip custom debuginfo instructions when dumping SPIR-T",
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);
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opts.optflag(
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"",
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"spirt-keep-debug-sources-in-dumps",
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"keep file contents debuginfo when dumping SPIR-T",
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);
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opts.optflag(
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"",
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@ -548,8 +553,10 @@ impl CodegenArgs {
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dump_post_merge: matches_opt_dump_dir_path("dump-post-merge"),
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dump_post_split: matches_opt_dump_dir_path("dump-post-split"),
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dump_spirt_passes: matches_opt_dump_dir_path("dump-spirt-passes"),
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spirt_keep_custom_debuginfo_in_dumps: matches
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.opt_present("spirt-keep-custom-debuginfo-in-dumps"),
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spirt_strip_custom_debuginfo_from_dumps: matches
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.opt_present("spirt-strip-custom-debuginfo-from-dumps"),
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spirt_keep_debug_sources_in_dumps: matches
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.opt_present("spirt-keep-debug-sources-in-dumps"),
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specializer_debug: matches.opt_present("specializer-debug"),
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specializer_dump_instances: matches_opt_path("specializer-dump-instances"),
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print_all_zombie: matches.opt_present("print-all-zombie"),
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@ -1,9 +1,12 @@
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use crate::custom_insts::{self, CustomOp};
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use rspirv::binary::Assemble;
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use rspirv::dr::{Instruction, Module, Operand};
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use rspirv::spirv::{Op, Word};
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use rustc_data_structures::fx::{FxHashMap, FxHashSet};
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use rustc_middle::bug;
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use smallvec::SmallVec;
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use std::collections::hash_map;
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use std::mem;
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// FIXME(eddyb) consider deduplicating the `OpString` and `OpSource` created for
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// file-level debuginfo (but using SPIR-T for linking might be better?).
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@ -269,19 +272,272 @@ pub fn remove_duplicate_types(module: &mut Module) {
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});
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}
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pub fn remove_duplicate_lines(module: &mut Module) {
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pub fn remove_duplicate_debuginfo(module: &mut Module) {
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// FIXME(eddyb) avoid repeating this across different passes/helpers.
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let custom_ext_inst_set_import = module
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.ext_inst_imports
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.iter()
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.find(|inst| {
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assert_eq!(inst.class.opcode, Op::ExtInstImport);
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inst.operands[0].unwrap_literal_string() == &custom_insts::CUSTOM_EXT_INST_SET[..]
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})
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.map(|inst| inst.result_id.unwrap());
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for func in &mut module.functions {
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for block in &mut func.blocks {
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block.instructions.dedup_by(|a, b| {
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if a.class.opcode == Op::Line && b.class.opcode == Op::Line {
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// dedup_by removes the *second* element in a pair of duplicates. We want to
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// remove the *first* (so the last OpLine is kept). So, swap them! :D
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std::mem::swap(a, b);
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true
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} else {
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false
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// Ignore the terminator, it's effectively "outside" debuginfo.
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let (_, insts) = block.instructions.split_last_mut().unwrap();
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// HACK(eddyb) to make random access easier, we first replace unused
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// instructions with `OpNop`, and then remove all the `OpNop`s.
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#[derive(Clone)]
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struct DbgLocInst {
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inst_idx: usize,
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used: bool,
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}
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fn nop() -> Instruction {
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Instruction::new(Op::Nop, None, None, vec![])
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}
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impl DbgLocInst {
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fn nop_if_unused(&self, insts: &mut [Instruction]) {
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if !self.used {
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insts[self.inst_idx] = nop();
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}
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}
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}
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#[derive(Clone, Default)]
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struct DbgState {
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loc: Option<DbgLocInst>,
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has_semantic_insts: bool,
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}
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let mut dbg = DbgState::default();
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struct Frame {
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call_dbg: DbgState,
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push_inst_idx: usize,
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}
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let mut inlined_frames = SmallVec::<[Frame; 8]>::new();
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// HACK(eddyb) `PopInlinedCallFrame` moves `inlined_frames.last()`
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// `fusable_freshly_popped_inlined_frames.last()`, so a sequence of
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// N pops will reverse the N last entries of `inlined_frames` into
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// this vector (and go from outside-in, to inside-out), which allows
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// *fusing* a pop with a push (of an identical inlined frame), when
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// no interverning instructions prevent it (such instructions will
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// clear this vector to indicate the pops are "fully committed").
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struct PoppedFrame {
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frame: Frame,
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callee_has_semantic_insts: bool,
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pop_inst_idx: usize,
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}
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let mut fusable_freshly_popped_inlined_frames = SmallVec::<[PoppedFrame; 8]>::new();
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for inst_idx in 0..insts.len() {
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let inst = &insts[inst_idx];
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let custom_op = match inst.class.opcode {
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Op::ExtInst
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if Some(inst.operands[0].unwrap_id_ref()) == custom_ext_inst_set_import =>
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{
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Some(CustomOp::decode_from_ext_inst(inst))
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}
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_ => None,
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};
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fn inst_eq_key(inst: &Instruction) -> impl PartialEq + '_ {
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(inst.class.opcode, &inst.operands)
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}
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// NOTE(eddyb) `fusable_freshly_popped_inlined_frames`-preserving
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// cases must all use `if can_continue { continue; }` to skip the
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// draining logic (`can_continue` is only `false` at the very end).
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let can_continue = inst_idx < insts.len() - 1;
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let prev_dbg_loc_snapshot = dbg.loc.clone();
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match (inst.class.opcode, custom_op) {
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(Op::Line | Op::NoLine, _)
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| (_, Some(CustomOp::SetDebugSrcLoc | CustomOp::ClearDebugSrcLoc)) => {
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// HACK(eddyb) prefer keeping older active `DbgLocInst`s,
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// if all the details are the same (it helps with fusion).
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if dbg.loc.as_ref().is_some_and(|old_dbg_loc| {
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inst_eq_key(inst) == inst_eq_key(&insts[old_dbg_loc.inst_idx])
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}) {
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insts[inst_idx] = nop();
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if can_continue {
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continue;
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}
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} else {
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dbg.loc = Some(DbgLocInst {
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inst_idx,
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used: false,
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});
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}
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}
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(_, Some(CustomOp::PushInlinedCallFrame)) => {
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// HACK(eddyb) attempt fusing this push with the last pop.
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let fuse_with_last_pop = fusable_freshly_popped_inlined_frames
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.last()
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.is_some_and(|last_popped| {
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// HACK(eddyb) updating `dbg.loc` deduplicates eagerly,
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// so here it suffices to check the (deduped) indices.
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let dbg_loc_inst_idx =
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|dbg: &DbgState| dbg.loc.as_ref().map(|d| d.inst_idx);
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dbg_loc_inst_idx(&last_popped.frame.call_dbg)
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== dbg_loc_inst_idx(&dbg)
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&& inst_eq_key(inst)
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== inst_eq_key(&insts[last_popped.frame.push_inst_idx])
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});
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if fuse_with_last_pop {
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let PoppedFrame {
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frame,
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callee_has_semantic_insts,
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pop_inst_idx,
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} = fusable_freshly_popped_inlined_frames.pop().unwrap();
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insts[pop_inst_idx] = nop();
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// Can't make entering an inlined function a nop,
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// as it needs to reset callee-side `DbgLocInst`,
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// but we can replace it in-place and hope later
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// it get nop'd out by some real `DbgLocInst`.
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insts[inst_idx].operands.splice(
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1..,
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[Operand::LiteralExtInstInteger(
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CustomOp::ClearDebugSrcLoc as u32,
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)],
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);
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dbg = DbgState {
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loc: Some(DbgLocInst {
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inst_idx,
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used: false,
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}),
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has_semantic_insts: callee_has_semantic_insts,
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};
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inlined_frames.push(frame);
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// Allow further fusing to occur.
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if can_continue {
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continue;
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}
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} else {
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// HACK(eddyb) the actual push to `inlined_frames` is
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// done at the very end of the loop body, to be able
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// to process any pending updates on the previous state.
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}
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}
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(_, Some(CustomOp::PopInlinedCallFrame)) => {
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// Leaving an inlined function doesn't use `DbgLocInst`.
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if let Some(dbg_loc) = dbg.loc.take() {
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// HACK(eddyb) only treat as "definitely unused"
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// instructions that are too "recent" to have been
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// used by a `PushInlinedCallFrame` with a still
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// uncommitted `PopInlinedCallFrame`.
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let min_safe_inst_idx_to_nop = fusable_freshly_popped_inlined_frames
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.last()
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.map_or(0, |last_popped| last_popped.pop_inst_idx);
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if dbg_loc.inst_idx > min_safe_inst_idx_to_nop {
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dbg_loc.nop_if_unused(insts);
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}
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}
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if let Some(frame) = inlined_frames.pop() {
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let callee_has_semantic_insts = dbg.has_semantic_insts;
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dbg = frame.call_dbg.clone();
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dbg.has_semantic_insts |= callee_has_semantic_insts;
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// HACK(eddyb) inform future `PushInlinedCallFrame`s
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// of potential fusion, by saving a copy of the frame.
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fusable_freshly_popped_inlined_frames.push(PoppedFrame {
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frame,
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callee_has_semantic_insts,
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pop_inst_idx: inst_idx,
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});
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} else {
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// FIXME(eddyb) this may indicate a bug elsewhere.
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insts[inst_idx] = nop();
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}
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if can_continue {
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continue;
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}
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}
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_ => {
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if let Some(dbg_loc) = &mut dbg.loc {
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dbg_loc.used = true;
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}
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dbg.has_semantic_insts = true;
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}
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}
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// NOTE(eddyb) mutable so that it may be marked as used below.
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let mut freshly_replaced_dbg_loc = prev_dbg_loc_snapshot.filter(|prev_dbg_loc| {
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dbg.loc.as_ref().map(|d| d.inst_idx) != Some(prev_dbg_loc.inst_idx)
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});
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// NOTE(eddyb) the iteration order doesn't matter, as this is
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// effectively a set of `PopInlinedCallFrame`s which have had
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// all their other side-effects processed, and didn't get a
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// chance to be fused away, so they're getting committed.
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for popped in fusable_freshly_popped_inlined_frames.drain(..) {
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let PoppedFrame {
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mut frame,
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callee_has_semantic_insts,
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pop_inst_idx,
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} = popped;
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// HACK(eddyb) this popped frame's `call_dbg.loc` may still
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// be used elsewhere, in which case that use takes precedence,
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// and is effectively the new "owner" of the `DbgLocInst`.
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let call_dbg_loc_used_elsewhere =
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frame.call_dbg.loc.as_ref().and_then(|call_dbg_loc| {
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[dbg.loc.as_mut(), freshly_replaced_dbg_loc.as_mut()]
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.into_iter()
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.flatten()
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.find(|dbg_loc| dbg_loc.inst_idx == call_dbg_loc.inst_idx)
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});
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if call_dbg_loc_used_elsewhere.is_some() {
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frame.call_dbg.loc = None;
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}
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if callee_has_semantic_insts {
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// The `PushInlinedCallFrame` being kept requires its
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// original `DbgLocInst` to also be kept around.
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if let Some(call_dbg_loc) = call_dbg_loc_used_elsewhere {
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call_dbg_loc.used = true;
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}
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} else {
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// If the entire inlined call is all `OpNop`s now,
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// entering/leaving it can also become `OpNop`s.
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if let Some(call_dbg_loc) = &mut frame.call_dbg.loc {
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call_dbg_loc.nop_if_unused(insts);
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}
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insts[frame.push_inst_idx] = nop();
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insts[pop_inst_idx] = nop();
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}
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}
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// Only remove a replaced `DbgLocInst` after it had a chance to
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// be marked as used above (for e.g. a `PushInlinedCallFrame`).
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if let Some(old_dbg_loc) = freshly_replaced_dbg_loc {
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old_dbg_loc.nop_if_unused(insts);
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}
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// HACK(eddyb) the actual push to `inlined_frames` is
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// done at the very end of the loop body, to be able
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// to process any pending updates on the previous state.
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if custom_op == Some(CustomOp::PushInlinedCallFrame) {
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inlined_frames.push(Frame {
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call_dbg: mem::take(&mut dbg),
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push_inst_idx: inst_idx,
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});
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}
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}
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assert!(fusable_freshly_popped_inlined_frames.is_empty());
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block
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.instructions
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.retain(|inst| inst.class.opcode != Op::Nop);
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}
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}
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}
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@ -919,13 +919,32 @@ impl Inliner<'_, '_> {
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let mut blocks = callee.blocks.clone();
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for block in &mut blocks {
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let last = block.instructions.last().unwrap();
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if let Op::Return | Op::ReturnValue = last.class.opcode {
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if Op::ReturnValue == last.class.opcode {
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let return_value = last.operands[0].id_ref_any().unwrap();
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block.instructions.insert(
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block.instructions.len() - 1,
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Instruction::new(
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let mut terminator = block.instructions.pop().unwrap();
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// HACK(eddyb) strip trailing debuginfo (as it can't impact terminators).
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while let Some(last) = block.instructions.last() {
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let can_remove = match last.class.opcode {
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Op::Line | Op::NoLine => true,
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Op::ExtInst => {
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last.operands[0].unwrap_id_ref() == custom_ext_inst_set_import
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&& matches!(
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CustomOp::decode_from_ext_inst(last),
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CustomOp::SetDebugSrcLoc | CustomOp::ClearDebugSrcLoc
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)
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}
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_ => false,
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};
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if can_remove {
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block.instructions.pop();
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} else {
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break;
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}
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}
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if let Op::Return | Op::ReturnValue = terminator.class.opcode {
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if Op::ReturnValue == terminator.class.opcode {
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let return_value = terminator.operands[0].id_ref_any().unwrap();
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block.instructions.push(Instruction::new(
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Op::Store,
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None,
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None,
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@ -933,41 +952,34 @@ impl Inliner<'_, '_> {
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Operand::IdRef(return_variable.unwrap()),
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Operand::IdRef(return_value),
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],
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),
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);
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));
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} else {
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assert!(return_variable.is_none());
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}
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*block.instructions.last_mut().unwrap() =
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terminator =
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Instruction::new(Op::Branch, None, None, vec![Operand::IdRef(return_jump)]);
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}
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let (debuginfo_prefix, debuginfo_suffix) = mk_debuginfo_prefix_and_suffix(true);
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block.instructions.splice(
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// Insert the prefix debuginfo instructions after `OpPhi`s,
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// which sadly can't be covered by them.
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{
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let i = block
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let num_phis = block
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.instructions
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.iter()
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.position(|inst| inst.class.opcode != Op::Phi)
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.unwrap();
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i..i
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},
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debuginfo_prefix,
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);
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block.instructions.splice(
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.take_while(|inst| inst.class.opcode == Op::Phi)
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.count();
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// HACK(eddyb) avoid adding debuginfo to otherwise-empty blocks.
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if block.instructions.len() > num_phis {
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let (debuginfo_prefix, debuginfo_suffix) = mk_debuginfo_prefix_and_suffix(true);
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// Insert the prefix debuginfo instructions after `OpPhi`s,
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// which sadly can't be covered by them.
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block
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.instructions
|
||||
.splice(num_phis..num_phis, debuginfo_prefix);
|
||||
// Insert the suffix debuginfo instructions before the terminator,
|
||||
// which sadly can't be covered by them.
|
||||
{
|
||||
let last_non_terminator = block.instructions.iter().rposition(|inst| {
|
||||
!rspirv::grammar::reflect::is_block_terminator(inst.class.opcode)
|
||||
});
|
||||
let i = last_non_terminator.map_or(0, |x| x + 1);
|
||||
i..i
|
||||
},
|
||||
debuginfo_suffix,
|
||||
);
|
||||
block.instructions.extend(debuginfo_suffix);
|
||||
}
|
||||
|
||||
block.instructions.push(terminator);
|
||||
}
|
||||
|
||||
let (caller_restore_debuginfo_after_call, calleer_reset_debuginfo_before_call) =
|
||||
|
||||
@ -60,7 +60,8 @@ pub struct Options {
|
||||
pub dump_post_merge: Option<PathBuf>,
|
||||
pub dump_post_split: Option<PathBuf>,
|
||||
pub dump_spirt_passes: Option<PathBuf>,
|
||||
pub spirt_keep_custom_debuginfo_in_dumps: bool,
|
||||
pub spirt_strip_custom_debuginfo_from_dumps: bool,
|
||||
pub spirt_keep_debug_sources_in_dumps: bool,
|
||||
pub specializer_debug: bool,
|
||||
pub specializer_dump_instances: Option<PathBuf>,
|
||||
pub print_all_zombie: bool,
|
||||
@ -327,6 +328,13 @@ pub fn link(
|
||||
}
|
||||
}
|
||||
|
||||
if opts.dce {
|
||||
let _timer =
|
||||
sess.timer("link_dce-and-remove_duplicate_debuginfo-after-mem2reg-before-inlining");
|
||||
dce::dce(&mut output);
|
||||
duplicates::remove_duplicate_debuginfo(&mut output);
|
||||
}
|
||||
|
||||
{
|
||||
let _timer = sess.timer("link_inline");
|
||||
inline::inline(sess, &mut output)?;
|
||||
@ -376,6 +384,13 @@ pub fn link(
|
||||
}
|
||||
}
|
||||
|
||||
if opts.dce {
|
||||
let _timer =
|
||||
sess.timer("link_dce-and-remove_duplicate_debuginfo-after-mem2reg-after-inlining");
|
||||
dce::dce(&mut output);
|
||||
duplicates::remove_duplicate_debuginfo(&mut output);
|
||||
}
|
||||
|
||||
// NOTE(eddyb) SPIR-T pipeline is entirely limited to this block.
|
||||
{
|
||||
let mut per_pass_module_for_dumping = vec![];
|
||||
@ -474,14 +489,28 @@ pub fn link(
|
||||
// NOTE(eddyb) this should be *before* `lift_to_spv` below,
|
||||
// so if that fails, the dump could be used to debug it.
|
||||
if let Some(dump_spirt_file_path) = &dump_spirt_file_path {
|
||||
// HACK(eddyb) unless requested otherwise, clean up the pretty-printed
|
||||
// SPIR-T output by converting our custom extended instructions, to
|
||||
// standard SPIR-V debuginfo (which SPIR-T knows how to pretty-print).
|
||||
if !opts.spirt_keep_custom_debuginfo_in_dumps {
|
||||
if opts.spirt_strip_custom_debuginfo_from_dumps {
|
||||
for (_, module) in &mut per_pass_module_for_dumping {
|
||||
spirt_passes::debuginfo::convert_custom_debuginfo_to_spv(module);
|
||||
}
|
||||
}
|
||||
if !opts.spirt_keep_debug_sources_in_dumps {
|
||||
for (_, module) in &mut per_pass_module_for_dumping {
|
||||
let spirt::ModuleDebugInfo::Spv(debuginfo) = &mut module.debug_info;
|
||||
for sources in debuginfo.source_languages.values_mut() {
|
||||
const DOTS: &str = "⋯";
|
||||
for file in sources.file_contents.values_mut() {
|
||||
*file = DOTS.into();
|
||||
}
|
||||
sources.file_contents.insert(
|
||||
cx.intern(DOTS),
|
||||
"sources hidden, to show them use \
|
||||
`RUSTGPU_CODEGEN_ARGS=--spirt-keep-debug-sources-in-dumps`"
|
||||
.into(),
|
||||
);
|
||||
}
|
||||
}
|
||||
}
|
||||
|
||||
let plan = spirt::print::Plan::for_versions(
|
||||
&cx,
|
||||
@ -670,8 +699,8 @@ pub fn link(
|
||||
}
|
||||
|
||||
{
|
||||
let _timer = sess.timer("link_remove_duplicate_lines");
|
||||
duplicates::remove_duplicate_lines(output);
|
||||
let _timer = sess.timer("link_remove_duplicate_debuginfo");
|
||||
duplicates::remove_duplicate_debuginfo(output);
|
||||
}
|
||||
|
||||
if opts.compact_ids {
|
||||
|
||||
@ -192,11 +192,19 @@ _Note: passes that are not already enabled by default are considered experimenta
|
||||
Dump the `SPIR-🇹` module across passes (i.e. all of the versions before/after each pass), as a combined report, to a pair of files (`.spirt` and `.spirt.html`) in `DIR`.
|
||||
<sub>(the `.spirt.html` version of the report is the recommended form for viewing, as it uses tabling for versions, syntax-highlighting-like styling, and use->def linking)</sub>
|
||||
|
||||
### `--spirt-keep-custom-debuginfo-in-dumps`
|
||||
### `--spirt-strip-custom-debuginfo-from-dumps`
|
||||
|
||||
When dumping (pretty-printed) `SPIR-🇹` (e.g. with `--dump-spirt-passes`), strip
|
||||
all the custom (Rust-GPU-specific) debuginfo instructions, by converting them
|
||||
to the standard SPIR-V debuginfo (which `SPIR-🇹` understands more directly).
|
||||
|
||||
The default (keeping the custom instructions) is more verbose, but also lossless,
|
||||
if you want to see all instructions exactly as e.g. `--spirt-passes` see them.
|
||||
|
||||
### `--spirt-keep-debug-sources-in-dumps`
|
||||
|
||||
When dumping (pretty-printed) `SPIR-🇹` (e.g. with `--dump-spirt-passes`), preserve
|
||||
all the custom (Rust-GPU-specific) debuginfo instructions, instead of converting
|
||||
them to the standard SPIR-V debuginfo (which `SPIR-🇹` pretty-prints specially).
|
||||
all the "file contents debuginfo" (i.e. from SPIR-V `OpSource` instructions),
|
||||
which will end up being included, in full, at the start of the dump.
|
||||
|
||||
The default (of performing that conversion) has prettier results, but is lossier
|
||||
if you want to see all instructions exactly as e.g. `--spirt-passes` see them.
|
||||
The default (of hiding the file contents) is less verbose, but (arguably) lossier.
|
||||
|
||||
Loading…
Reference in New Issue
Block a user