$ gdb --args out/arm.debug/d8 --print-code
GNU gdb (GDB) 7.4.1-debian
...
(gdb) r
...
d8> function foo(x) {return x ^ 0x1234;}
...
d8> foo(0);
...
--- Code ---
source_position = 12
kind = FUNCTION
name = foo
Instructions (size = 196)
0x2df888e0 0 e59d2004 ldr r2, [sp, #+4]
0x2df888e4 4 e59ac014 ldr ip, [r10, #+20]
...
(gdb) br *0x2df888e0
Breakpoint 1 at 0x2df888e0
(gdb) c
d8> foo(1);
...
Program received signal SIGSEGV, Segmentation fault.
0x2df888fc in ?? ()
(gdb) bt
#0 0x2df888fc in ?? ()
$ gdb --args out/arm.debug/d8 --print-code --always-opt
GNU gdb (GDB) 7.4.1-debian
...
(gdb) r
...
d8> function foo(x) {return x ^ 0x1234;}
...
d8> foo(0);
...
--- Optimized code ---
optimization_id = 21
source_position = 12
kind = OPTIMIZED_FUNCTION
name = foo
stack_slots = 1
Instructions (size = 131)
0x51f10720 0 e92d4882 stmdb sp!, {r1, r7, fp, lr}
0x51f10724 4 e1a0c00c mov ip, ip...
...
(gdb) br * 0x51f10720
Breakpoint 1 at 0x2df888e0
(gdb) c
d8> foo(1);
...
#
# Fatal error in ../src/deoptimizer.cc, line 2726
# CHECK_EQ(Smi::cast(function), Smi::FromInt(StackFrame::STUB)) failed
# Expected: 0x2
# Found: 0xc
#
==== C stack trace ===============================
(empty)
Program received signal SIGABRT, Aborted.
0xf75a7f96 in ?? () from /lib/arm-linux-gnueabihf/libc.so.6
(gdb) bt
#0 0xf75a7f96 in ?? () from /lib/arm-linux-gnueabihf/libc.so.6
#1 0xf75b5f8a in raise () from /lib/arm-linux-gnueabihf/libc.so.6
#2 0xf75b8428 in abort () from /lib/arm-linux-gnueabihf/libc.so.6
#3 0x00b20aaa in v8::base::OS::Abort () at ../src/base/platform/platform-posix.cc:220
#4 0x00b1d5ca in V8_Fatal (file=0xc89a2c "../src/deoptimizer.cc", line=2726, format=0xc560d0 "CHECK_EQ(%s, %s) failed\n# Expected: %p\n# Found: %p") at ../src/base/logging.cc:87
#5 0x005a8b60 in CheckEqualsHelper (file=0xc89a2c "../src/deoptimizer.cc", line=2726, expected_source=0xc8b07c "Smi::cast(function)", expected=0x2, value_source=0xc8b090 "Smi::FromInt(StackFrame::STUB)", value=0xc) at .././src/base/logging.h:139
#6 0x006840be in v8::internal::Deoptimizer::ComputeIncomingArgumentSize (this=0x19bd4d8, function=0x2) at ../src/deoptimizer.cc:2726
#7 0x0068405e in v8::internal::Deoptimizer::ComputeFixedSize (this=0x19bd4d8, function=0x2) at ../src/deoptimizer.cc:2717
#8 0x00683fbc in v8::internal::Deoptimizer::ComputeInputFrameSize (this=0x19bd4d8) at ../src/deoptimizer.cc:2700
#9 0x0067e91a in v8::internal::Deoptimizer::Deoptimizer (this=0x19bd4d8, isolate=0x1995688, function=0x0, type=v8::internal::Deoptimizer::EAGER, bailout_id=1, from=0x51f10790 "\001", fp_to_sp_delta=12, optimized_code=0x0) at ../src/deoptimizer.cc:612
#10 0x0067d32e in v8::internal::Deoptimizer::New (function=0x2, type=v8::internal::Deoptimizer::EAGER, bailout_id=1, from=0x51f10790 "\001", fp_to_sp_delta=12, isolate=0x1995688) at ../src/deoptimizer.cc:90
#11 0x5fb0a268 in ?? ()
#12 0x5fb0a268 in ?? ()
Backtrace stopped: previous frame identical to this frame (corrupt stack?)
--
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