• oliver@apple.com's avatar
    fourthTier: Implement a probe mechanism for JIT generated code. · e9743fd0
    oliver@apple.com authored
    https://bugs.webkit.org/show_bug.cgi?id=115705.
    
    Reviewed by Geoffrey Garen.
    
    The probe is in the form of a MacroAssembler pseudo instruction.
    It takes 3 arguments: a ProbeFunction, and 2 void* args.
    
    When inserted into the JIT at some code generation site, the probe
    pseudo "instruction" will emit a minimal amount of code to save the
    stack pointer, 1 (or more) scratch register(s), and the probe
    arguments into a ProbeContext record on the stack. The emitted code
    will then call a probe trampoline to do the rest of the work, which
    consists of:
    1. saving the remaining registers into the ProbeContext.
    2. calling the ProbeFunction, and passing it the ProbeContext pointer.
    3. restoring the registers from the ProbeContext after the ProbeFunction
       returns, and then returning to the JIT generated code.
    
    The ProbeContext is stack allocated and is only valid for the duration
    that the ProbeFunction is executing.
    
    If the user supplied ProbeFunction alters the register values in the
    ProbeContext, the new values will be installed into the registers upon
    returning from the probe. This can be useful for some debugging or
    testing purposes.
    
    The probe mechanism is built conditional on USE(MASM_PROBE) which is
    defined in config.h. USE(MASM_PROBE) will off by default.
    
    This changeset only implements the probe mechanism for X86 and X86_64.
    
    * CMakeLists.txt:
    * GNUmakefile.list.am:
    * JavaScriptCore.vcproj/JavaScriptCore/JavaScriptCore.vcproj:
    * JavaScriptCore.vcxproj/JavaScriptCore.vcxproj:
    * JavaScriptCore.vcxproj/JavaScriptCore.vcxproj.filters:
    * JavaScriptCore.xcodeproj/project.pbxproj:
    * Target.pri:
    * assembler/MacroAssembler.h:
    (MacroAssembler):
    (JSC::MacroAssembler::shouldBlind):
    (JSC::MacroAssembler::store32):
    * assembler/MacroAssemblerX86.h:
    (MacroAssemblerX86):
    (JSC::MacroAssemblerX86::trustedImm32FromPtr):
    (JSC::MacroAssemblerX86::probe):
    * assembler/MacroAssemblerX86Common.cpp: Added.
    (JSC::MacroAssemblerX86Common::ProbeContext::dumpCPURegisters):
    - CPU specific register dumper called by ProbeContext::dump().
    (JSC::MacroAssemblerX86Common::ProbeContext::dump):
    - Prints the ProbeContext to the DataLog.
    * assembler/MacroAssemblerX86Common.h:
    (MacroAssemblerX86Common):
    (CPUState): Added.
    (ProbeContext): Added.
    * assembler/MacroAssemblerX86_64.h:
    (MacroAssemblerX86_64):
    (JSC::MacroAssemblerX86_64::trustedImm64FromPtr):
    (JSC::MacroAssemblerX86_64::probe):
    * assembler/X86Assembler.h:
    * config.h: Added WTF_USE_MASM_PROBE flag.
    * jit/JITStubs.cpp:
    * jit/JITStubs.h:
    * jit/JITStubsX86.h:
    * jit/JITStubsX86Common.h: Added.
    * jit/JITStubsX86_64.h:
    
    git-svn-id: http://svn.webkit.org/repository/webkit/trunk@153162 268f45cc-cd09-0410-ab3c-d52691b4dbfc
    e9743fd0
GNUmakefile.list.am 42.2 KB