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Reftypes part two: add support for stackmaps.

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This commit adds support for generating stackmaps at safepoints to the
new backend framework and to the AArch64 backend in particular. It has
been tested to work with SpiderMonkey.
This commit is contained in:
Chris Fallin
2020-06-29 15:49:18 -07:00
parent b93e8c296d
commit 08353fcc14
17 changed files with 597 additions and 143 deletions
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9
cranelift/codegen/src/regalloc/safepoint.rs
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@@ -1,6 +1,7 @@
use crate::cursor::{Cursor, FuncCursor};
use crate::dominator_tree::DominatorTree;
use crate::ir::{Function, InstBuilder, Opcode};
use crate::inst_predicates::is_safepoint;
use crate::ir::{Function, InstBuilder};
use crate::isa::TargetIsa;
use crate::regalloc::live_value_tracker::LiveValueTracker;
use crate::regalloc::liveness::Liveness;
@@ -51,12 +52,8 @@ pub fn emit_stackmaps(
pos.goto_top(block);
while let Some(inst) = pos.next_inst() {
if pos.func.dfg[inst].opcode().is_resumable_trap() {
if is_safepoint(&pos.func, inst) {
insert_and_encode_safepoint(&mut pos, tracker, isa);
} else if pos.func.dfg[inst].opcode().is_call() {
insert_and_encode_safepoint(&mut pos, tracker, isa);
} else if pos.func.dfg[inst].opcode() == Opcode::Safepoint {
panic!("safepoint instruction can only be used by the compiler!");
}
// Process the instruction and get rid of dead values.