Mercurial > hg > graal-compiler
diff src/cpu/x86/vm/dump_x86_32.cpp @ 0:a61af66fc99e jdk7-b24
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author | duke |
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date | Sat, 01 Dec 2007 00:00:00 +0000 |
parents | |
children | dc7f315e41f7 |
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--- /dev/null Thu Jan 01 00:00:00 1970 +0000 +++ b/src/cpu/x86/vm/dump_x86_32.cpp Sat Dec 01 00:00:00 2007 +0000 @@ -0,0 +1,124 @@ +/* + * Copyright 2004-2007 Sun Microsystems, Inc. All Rights Reserved. + * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER. + * + * This code is free software; you can redistribute it and/or modify it + * under the terms of the GNU General Public License version 2 only, as + * published by the Free Software Foundation. + * + * This code is distributed in the hope that it will be useful, but WITHOUT + * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or + * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License + * version 2 for more details (a copy is included in the LICENSE file that + * accompanied this code). + * + * You should have received a copy of the GNU General Public License version + * 2 along with this work; if not, write to the Free Software Foundation, + * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA. + * + * Please contact Sun Microsystems, Inc., 4150 Network Circle, Santa Clara, + * CA 95054 USA or visit www.sun.com if you need additional information or + * have any questions. + * + */ + +# include "incls/_precompiled.incl" +# include "incls/_dump_x86_32.cpp.incl" + + + +// Generate the self-patching vtable method: +// +// This method will be called (as any other Klass virtual method) with +// the Klass itself as the first argument. Example: +// +// oop obj; +// int size = obj->klass()->klass_part()->oop_size(this); +// +// for which the virtual method call is Klass::oop_size(); +// +// The dummy method is called with the Klass object as the first +// operand, and an object as the second argument. +// + +//===================================================================== + +// All of the dummy methods in the vtable are essentially identical, +// differing only by an ordinal constant, and they bear no releationship +// to the original method which the caller intended. Also, there needs +// to be 'vtbl_list_size' instances of the vtable in order to +// differentiate between the 'vtable_list_size' original Klass objects. + +#define __ masm-> + +void CompactingPermGenGen::generate_vtable_methods(void** vtbl_list, + void** vtable, + char** md_top, + char* md_end, + char** mc_top, + char* mc_end) { + + intptr_t vtable_bytes = (num_virtuals * vtbl_list_size) * sizeof(void*); + *(intptr_t *)(*md_top) = vtable_bytes; + *md_top += sizeof(intptr_t); + void** dummy_vtable = (void**)*md_top; + *vtable = dummy_vtable; + *md_top += vtable_bytes; + + // Get ready to generate dummy methods. + + CodeBuffer cb((unsigned char*)*mc_top, mc_end - *mc_top); + MacroAssembler* masm = new MacroAssembler(&cb); + + Label common_code; + for (int i = 0; i < vtbl_list_size; ++i) { + for (int j = 0; j < num_virtuals; ++j) { + dummy_vtable[num_virtuals * i + j] = (void*)masm->pc(); + + // Load rax, with a value indicating vtable/offset pair. + // -- bits[ 7..0] (8 bits) which virtual method in table? + // -- bits[12..8] (5 bits) which virtual method table? + // -- must fit in 13-bit instruction immediate field. + __ movl(rax, (i << 8) + j); + __ jmp(common_code); + } + } + + __ bind(common_code); + +#ifdef WIN32 + // Expecting to be called with "thiscall" conventions -- the arguments + // are on the stack, except that the "this" pointer is in rcx. +#else + // Expecting to be called with Unix conventions -- the arguments + // are on the stack, including the "this" pointer. +#endif + + // In addition, rax was set (above) to the offset of the method in the + // table. + +#ifdef WIN32 + __ pushl(rcx); // save "this" +#endif + __ movl(rcx, rax); + __ shrl(rcx, 8); // isolate vtable identifier. + __ shll(rcx, LogBytesPerWord); + Address index(noreg, rcx, Address::times_1); + ExternalAddress vtbl((address)vtbl_list); + __ movptr(rdx, ArrayAddress(vtbl, index)); // get correct vtable address. +#ifdef WIN32 + __ popl(rcx); // restore "this" +#else + __ movl(rcx, Address(rsp, 4)); // fetch "this" +#endif + __ movl(Address(rcx, 0), rdx); // update vtable pointer. + + __ andl(rax, 0x00ff); // isolate vtable method index + __ shll(rax, LogBytesPerWord); + __ addl(rax, rdx); // address of real method pointer. + __ jmp(Address(rax, 0)); // get real method pointer. + + __ flush(); + + *mc_top = (char*)__ pc(); +}