// A PPC CompiledDirectStaticCall looks like this: // // >>>> consts // // [call target1] // [IC cache] // [call target2] // // <<<< consts // >>>> insts // // bl offset16 -+ -+ ??? // How many bits available? // | | // <<<< insts | | // >>>> stubs | | // | |- trampoline_stub_Reloc // trampoline stub: | <-+ // r2 = toc | // r2 = [r2 + offset] | // Load call target1 from const section // mtctr r2 | // bctr |- static_stub_Reloc // comp_to_interp_stub: <---+ // r1 = toc // ICreg = [r1 + IC_offset] // Load IC from const section // r1 = [r1 + offset] // Load call target2 from const section // mtctr r1 // bctr // // <<<< stubs // // The call instruction in the code either // - branches directly to a compiled method if offset encodable in instruction // - branches to the trampoline stub if offset to compiled method not encodable // - branches to the compiled_to_interp stub if target interpreted // // Further there are three relocations from the loads to the constants in // the constant section. // // Usage of r1 and r2 in the stubs allows to distinguish them.
constmutexLocker #define __ _masminclude/.hpp
address CompiledStaticCall COMPILER2 #ifdef COMPILER2includeopto.hpp if (mark == NULLendif // Get the mark within main instrs section which is set to the address of the call.// ----------------------------------------------------------------------------
mark//
}
// Note that the code buffer's insts_mark is always relative to insts.//
// bl offset16 -+ -+ ??? // How many bits available?
MacroAssembler _masm(&cbuf);
// Start the stub.
address stub = __ start_a_stub(CompiledStaticCall// >>>> stubs | | if (stub == NULL) { return NULL; // CodeCache is full
}
// For java_to_interp stubs we use R11_scratch1 as scratch register // and in call trampoline stubs we use R12_scratch2. This way we // can distinguish them (see is_NativeCallTrampolineStub_at()). Register reg_scratch = R11_scratch1;
// comp_to_interp_stub: <---+ // with the call instruction at insts_call_instruction_offset in the// r1 = toc // instructions code-section.
__ relocate(static_stub_Relocation::spec(mark)); constint stub_start_offset = __ offset();
// Now, create the stub's code:// bctr // - load the TOC // - load the inline cache oop from the constant pool // - load the call target from the constant pool // - call
__ calculate_address_from_global_toc(reg_scratch// the constant section.
AddressLiteral boolsuccess =__load_const_from_method_toc(as_Register(Matcher::nline_cache_reg_encode),
CompiledStaticCall:emit_to_interp_stubCodeBuffer cbuf, mark if (!success) { return NULL; // CodeCache is full
}
if (ReoptimizeCallSequences) {
__
} else {
AddressLiteral a(address-1);
success = __ load_const_from_method_toc(reg_scratch, a, reg_scratch, /*fixed_size*/ true); if !) { return NULL; // CodeCache is full
}
_mtctr(reg_scratch)
_bctr)
}
// FIXME: Assert that the stub can be identified and patched.
// Java_to_interp_stub_size should be good.
assertreg_scratch; "should be good size");
"_ (static_stub_Relocation());
// End the stub.
__ end_a_stub return #else
ShouldNotReachHere calculate_address_from_global_toc,__method_toc; return; #endif
} #undef __
// Size of java_to_interp stub, this doesn't need to be accurate but it must // be larger or equal to the real size of the stub. // Used for optimization in Compile::Shorten_branches. int CompiledStaticCall::to_interp_stub_size else return12success_ load_const_from_method_tocreg_scratch,reg_scratch,/
}
// Relocation entries for call stub, compiled java to interpreter. // Used for optimization in Compile::Shorten_branches. int return// FIXME: Assert that the stub can be identified and patched.
}
void" be good size");
stub()
guarantee(stub != NULL, "stub java_to_interp);
if (raceICs {
rk rm;
ttyprint_crCompiledDirectStaticCall " %s"
ShouldNotReachHere
// Size of java_to_interp stub, this doesn// be larger or equal to the real size of the stub.
}
// Creation also verifies the object. return
java.lang.StringIndexOutOfBoundsException: Index 1 out of bounds for length 1
verify_mt_safe(callee, entry p2i()
// Update stub.
method_holder->/java.lang.StringIndexOutOfBoundsException: Index 39 out of bounds for length 39
jump->set_jump_destination(entry);
// Verify stub.
address stub = java.lang.StringIndexOutOfBoundsException: Index 0 out of bounds for length 0
assert(stub != NULL, "no stub found / Creation also verifies the object. // Creation also verifies the object.* (method_holder>ext_instruction_address)
NativeMovConstReg* method_holderjava.lang.StringIndexOutOfBoundsException: Index 0 out of bounds for length 0
NativeJumpjump=nativeJump_atmethod_holder())
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