Status: New
Owner: ----
New issue 2380 by [email protected]: snapshot build crashing when
compiling C++ code to Thumb.
http://code.google.com/p/v8/issues/detail?id=2380
in revision 12755 (Use movw/movt instead of constant pool on ARMv7) the
methods Assembler::target_address_at and Assembler::set_target_address_at
in assembler-arm-inl.h will clear the bottom two bits. According to the
comments it was put in as a "JIT hardening" measure to prevent switching
tho Thumb mode. While the JIT never emits Thumb code, the C++ code could be
compiled for Thumb. If this is the case then V8 with snapshots will crash
because the serializer will use the aforementioned methods when generating
the snapshots and any ExternalReference to C++ Thumb functions will have
its bottom bits cleared making it look like ARM code ...
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