Mercurial > hg > graal-compiler
view src/share/vm/asm/assembler.cpp @ 124:b130b98db9cf
6689060: Escape Analysis does not work with Compressed Oops
Summary: 64-bits VM crashes with -XX:+AggresiveOpts (Escape Analysis + Compressed Oops)
Reviewed-by: never, sgoldman
author | kvn |
---|---|
date | Wed, 23 Apr 2008 11:20:36 -0700 |
parents | a61af66fc99e |
children | 1fdb98a17101 |
line wrap: on
line source
/* * Copyright 1997-2006 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/_assembler.cpp.incl" // Implementation of AbstractAssembler // // The AbstractAssembler is generating code into a CodeBuffer. To make code generation faster, // the assembler keeps a copy of the code buffers boundaries & modifies them when // emitting bytes rather than using the code buffers accessor functions all the time. // The code buffer is updated via set_code_end(...) after emiting a whole instruction. AbstractAssembler::AbstractAssembler(CodeBuffer* code) { if (code == NULL) return; CodeSection* cs = code->insts(); cs->clear_mark(); // new assembler kills old mark _code_section = cs; _code_begin = cs->start(); _code_limit = cs->limit(); _code_pos = cs->end(); _oop_recorder= code->oop_recorder(); if (_code_begin == NULL) { vm_exit_out_of_memory1(0, "CodeCache: no room for %s", code->name()); } } void AbstractAssembler::set_code_section(CodeSection* cs) { assert(cs->outer() == code_section()->outer(), "sanity"); assert(cs->is_allocated(), "need to pre-allocate this section"); cs->clear_mark(); // new assembly into this section kills old mark _code_section = cs; _code_begin = cs->start(); _code_limit = cs->limit(); _code_pos = cs->end(); } // Inform CodeBuffer that incoming code and relocation will be for stubs address AbstractAssembler::start_a_stub(int required_space) { CodeBuffer* cb = code(); CodeSection* cs = cb->stubs(); assert(_code_section == cb->insts(), "not in insts?"); sync(); if (cs->maybe_expand_to_ensure_remaining(required_space) && cb->blob() == NULL) { return NULL; } set_code_section(cs); return pc(); } // Inform CodeBuffer that incoming code and relocation will be code // Should not be called if start_a_stub() returned NULL void AbstractAssembler::end_a_stub() { assert(_code_section == code()->stubs(), "not in stubs?"); sync(); set_code_section(code()->insts()); } // Inform CodeBuffer that incoming code and relocation will be for stubs address AbstractAssembler::start_a_const(int required_space, int required_align) { CodeBuffer* cb = code(); CodeSection* cs = cb->consts(); assert(_code_section == cb->insts(), "not in insts?"); sync(); address end = cs->end(); int pad = -(intptr_t)end & (required_align-1); if (cs->maybe_expand_to_ensure_remaining(pad + required_space)) { if (cb->blob() == NULL) return NULL; end = cs->end(); // refresh pointer } if (pad > 0) { while (--pad >= 0) { *end++ = 0; } cs->set_end(end); } set_code_section(cs); return end; } // Inform CodeBuffer that incoming code and relocation will be code // Should not be called if start_a_const() returned NULL void AbstractAssembler::end_a_const() { assert(_code_section == code()->consts(), "not in consts?"); sync(); set_code_section(code()->insts()); } void AbstractAssembler::flush() { sync(); ICache::invalidate_range(addr_at(0), offset()); } void AbstractAssembler::a_byte(int x) { emit_byte(x); } void AbstractAssembler::a_long(jint x) { emit_long(x); } // Labels refer to positions in the (to be) generated code. There are bound // and unbound // // Bound labels refer to known positions in the already generated code. // offset() is the position the label refers to. // // Unbound labels refer to unknown positions in the code to be generated; it // may contain a list of unresolved displacements that refer to it #ifndef PRODUCT void AbstractAssembler::print(Label& L) { if (L.is_bound()) { tty->print_cr("bound label to %d|%d", L.loc_pos(), L.loc_sect()); } else if (L.is_unbound()) { L.print_instructions((MacroAssembler*)this); } else { tty->print_cr("label in inconsistent state (loc = %d)", L.loc()); } } #endif // PRODUCT void AbstractAssembler::bind(Label& L) { if (L.is_bound()) { // Assembler can bind a label more than once to the same place. guarantee(L.loc() == locator(), "attempt to redefine label"); return; } L.bind_loc(locator()); L.patch_instructions((MacroAssembler*)this); } void AbstractAssembler::generate_stack_overflow_check( int frame_size_in_bytes) { if (UseStackBanging) { // Each code entry causes one stack bang n pages down the stack where n // is configurable by StackBangPages. The setting depends on the maximum // depth of VM call stack or native before going back into java code, // since only java code can raise a stack overflow exception using the // stack banging mechanism. The VM and native code does not detect stack // overflow. // The code in JavaCalls::call() checks that there is at least n pages // available, so all entry code needs to do is bang once for the end of // this shadow zone. // The entry code may need to bang additional pages if the framesize // is greater than a page. const int page_size = os::vm_page_size(); int bang_end = StackShadowPages*page_size; // This is how far the previous frame's stack banging extended. const int bang_end_safe = bang_end; if (frame_size_in_bytes > page_size) { bang_end += frame_size_in_bytes; } int bang_offset = bang_end_safe; while (bang_offset <= bang_end) { // Need at least one stack bang at end of shadow zone. bang_stack_with_offset(bang_offset); bang_offset += page_size; } } // end (UseStackBanging) } void Label::add_patch_at(CodeBuffer* cb, int branch_loc) { assert(_loc == -1, "Label is unbound"); if (_patch_index < PatchCacheSize) { _patches[_patch_index] = branch_loc; } else { if (_patch_overflow == NULL) { _patch_overflow = cb->create_patch_overflow(); } _patch_overflow->push(branch_loc); } ++_patch_index; } void Label::patch_instructions(MacroAssembler* masm) { assert(is_bound(), "Label is bound"); CodeBuffer* cb = masm->code(); int target_sect = CodeBuffer::locator_sect(loc()); address target = cb->locator_address(loc()); while (_patch_index > 0) { --_patch_index; int branch_loc; if (_patch_index >= PatchCacheSize) { branch_loc = _patch_overflow->pop(); } else { branch_loc = _patches[_patch_index]; } int branch_sect = CodeBuffer::locator_sect(branch_loc); address branch = cb->locator_address(branch_loc); if (branch_sect == CodeBuffer::SECT_CONSTS) { // The thing to patch is a constant word. *(address*)branch = target; continue; } #ifdef ASSERT // Cross-section branches only work if the // intermediate section boundaries are frozen. if (target_sect != branch_sect) { for (int n = MIN2(target_sect, branch_sect), nlimit = (target_sect + branch_sect) - n; n < nlimit; n++) { CodeSection* cs = cb->code_section(n); assert(cs->is_frozen(), "cross-section branch needs stable offsets"); } } #endif //ASSERT // Push the target offset into the branch instruction. masm->pd_patch_instruction(branch, target); } } void AbstractAssembler::block_comment(const char* comment) { if (sect() == CodeBuffer::SECT_INSTS) { code_section()->outer()->block_comment(offset(), comment); } } #ifndef PRODUCT void Label::print_instructions(MacroAssembler* masm) const { CodeBuffer* cb = masm->code(); for (int i = 0; i < _patch_index; ++i) { int branch_loc; if (i >= PatchCacheSize) { branch_loc = _patch_overflow->at(i - PatchCacheSize); } else { branch_loc = _patches[i]; } int branch_pos = CodeBuffer::locator_pos(branch_loc); int branch_sect = CodeBuffer::locator_sect(branch_loc); address branch = cb->locator_address(branch_loc); tty->print_cr("unbound label"); tty->print("@ %d|%d ", branch_pos, branch_sect); if (branch_sect == CodeBuffer::SECT_CONSTS) { tty->print_cr(PTR_FORMAT, *(address*)branch); continue; } masm->pd_print_patched_instruction(branch); tty->cr(); } } #endif // ndef PRODUCT