I'm trying to use trace-ignition-dispatches flag to see javascript
bytecodes executed. But the resulting json doesn't contain any numbers.
And a tool `v8/tools/ignition/bytecode_dispatches_report.py
~/ignition.json` shows 0 values for all the bytecodes. The optimization is
disables with `--no-opt` and v8 is compiled with
`v8_enable_trace_feedback_updates = true`.
Top bytecodes:
0 DebugBreakWide
0 CreateRegExpLiteral
0 CallProperty2
0 LdaLookupContextSlotInsideTypeof
0 AddSmi
0 Illegal
0 ThrowSuperAlreadyCalledIfNotHole
0 CreateWithContext
..........
0 MulSmi
0 PushContext
0 JumpIfJSReceiverConstant
0 ToString
0 CreateUnmappedArguments
0 TestTypeOf
*Script to produce dispatches:*
`v8/out/x64.debug/d8 --no-opt --trace-ignition-codegen
--trace-ignition-dispatches
--trace-ignition-dispatches-output-file=~/ignition.json --print-bytecode
--enable-tracing test.js`
*test.js:*
var i, j = 0;
for (i = 0; i < 1000000; i++) {
j = j + 1; i+1;
}
*args.gn:*
is_component_build = true
is_debug = true
symbol_level = 2
target_cpu = "x64"
use_goma = false
goma_dir = "None"
v8_enable_backtrace = true
v8_enable_fast_mksnapshot = true
v8_enable_slow_dchecks = true
v8_optimized_debug = false
enable_profiling = true
v8_enable_trace_maps = true
v8_enable_trace_feedback_updates = true
v8_enable_concurrent_marking = true
v8_enable_gdbjit = true
--
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