[drlvm][jit] How to override jit compilation?
Hi, I want to override some specific java methods with native fast path implementations. So I try to override them in compile_do_compilation_jit()(vm/vmcore/src/jit/compile.cpp), that is, I add several entries in _stub_override_entries_base[](vm/vmcore/src/util/ia32/base/compile_IA32.cpp), and lookup this table before invoke jit-compile_method_with_params(). It works for JET, but failed when OPT recompile these method. Does the OPT go different path? If so, how can I override it? Does anyone can help me? Thanks, tonny
Re: [drlvm][jit] How to override jit compilation?
30 Oct 2006 11:03:50 +0600, Egor Pasko [EMAIL PROTECTED]: On the 0x212 day of Apache Harmony Tonny Lau wrote: Hi, I want to override some specific java methods with native fast path implementations. So I try to override them in compile_do_compilation_jit()(vm/vmcore/src/jit/compile.cpp), that is, I add several entries in _stub_override_entries_base[](vm/vmcore/src/util/ia32/base/compile_IA32.cpp), and lookup this table before invoke jit-compile_method_with_params(). This mechanism is not used (AFAIR and AFAICanSeeNow). The alternative way is to support your magics within each JIT. (Mikhail does things like that in OPT just from JavaByteCodeTranslator.cpp (see isMagicClass(...)) Thanks! I'll look it. It works for JET, but failed when OPT recompile these method. Does the OPT go different path? If so, how can I override it? Does anyone can help me? how does it fail? did you try it with -Xem:opt? (That's what I tend to always ask about:) Just a guess: OPT expects some profile from JET, but cannot find any. I mean, the overriding succeeds when I use JET only, i.e., java - Dem.properties=jet If I use the default configuration java ..., at the beginning, the overriding is successful because the code is compiled by JET. But later, when the EM invoke OPT to re-compile the hot code, the overriding does not work any longer. It fall back to the original java code. So, where do you think is the best place in OPT for the overriding code? And is there a common path for both JET and OPT? -- Egor Pasko, Intel Managed Runtime Division
Re: [drlvm][jit] How to override jit compilation?
2006/10/30, Alex Astapchuk [EMAIL PROTECTED]: Tonny, Tonny Lau wrote: Hi, I want to override some specific java methods with native fast path implementations. So I try to override them in compile_do_compilation_jit()(vm/vmcore/src/jit/compile.cpp), that is, I add several entries in _stub_override_entries_base[](vm/vmcore/src/util/ia32/base/compile_IA32.cpp), and lookup this table before invoke jit-compile_method_with_params(). It works for JET, but failed when OPT recompile these method. Does the OPT go different path? I suppose it's because OPT inlines the methods of your interest, so they simply do not go through the VM's compilation machinery. If so, how can I override it? Does anyone can help me? Try to turn off inlining in OPT - will it help? You're right. It works for OPT after I disable inline. :) But there is a performance regression when the compiler switch to OPT. I'll continue the investigation. Thanks! -- Thanks, Alex
[drlvm] How to debug the drlvm with gdb?
Hi, I checked out the latest drlvm, and failed to set breakpoint when I used gdb. It seems the harmony/enhanced/drlvm/trunk/build/lnx_ia32_gcc_debug/deploy/jre/bin/java is copied from harmony/enhanced/classlib/trunk/deploy/jdk/jre/bin/java, i.e., it is not a debug version. Does anyone know how to debug it? Thanks! Best wishes, tonny
