AuroraMiddleware/v8
1
0
Fork 0
Code Issues 2 Pull Requests Releases Wiki Activity

[wasm] --liftoff-only should disable --wasm-dynamic-tiering

Browse Source 
A Liftoff only configuration should never tier up to TurboFan, hence add
a proper implication to disable dynamic tiering if --liftoff-only is
set.
Also, add a DCHECK to ensure we never accidentally compile with TurboFan
if --liftoff-only is set.

R=jkummerow@chromium.org

Bug: v8:12281
Change-Id: Ia9b81add503cc939f59fde3f4d3bb67252facf2c
Reviewed-on: https://chromium-review.googlesource.com/c/v8/v8/+/3569741
Reviewed-by: Jakob Kummerow <jkummerow@chromium.org>
Commit-Queue: Clemens Backes <clemensb@chromium.org>
Cr-Commit-Position: refs/heads/main@{#79779}
This commit is contained in:
Clemens Backes 2022-04-04 17:23:17 +02:00 committed by V8 LUCI CQ
parent 64e8935031
commit 54e360d141
2 changed files with 5 additions and 0 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

4
src/compiler/wasm-compiler.cc
View File

@ -8440,6 +8440,10 @@ wasm::WasmCompilationResult ExecuteTurbofanWasmCompilation(
wasm::CompilationEnv* env, const wasm::WireBytesStorage* wire_byte_storage,
const wasm::FunctionBody& func_body, int func_index, Counters* counters,
wasm::WasmFeatures* detected) {
// Check that we do not accidentally compile a Wasm function to TurboFan if
// --liftoff-only is set.
DCHECK(!FLAG_liftoff_only);
TRACE_EVENT2(TRACE_DISABLED_BY_DEFAULT("v8.wasm.detailed"),
"wasm.CompileTopTier", "func_index", func_index, "body_size",
func_body.end - func_body.start);

1
src/flags/flag-definitions.h
View File

@ -1011,6 +1011,7 @@ DEFINE_BOOL(liftoff_only, false,
"disallow TurboFan compilation for WebAssembly (for testing)")
DEFINE_IMPLICATION(liftoff_only, liftoff)
DEFINE_NEG_IMPLICATION(liftoff_only, wasm_tier_up)
DEFINE_NEG_IMPLICATION(liftoff_only, wasm_dynamic_tiering)
DEFINE_NEG_IMPLICATION(fuzzing, liftoff_only)
DEFINE_DEBUG_BOOL(
enable_testing_opcode_in_wasm, false,