/
stubGenerator_ppc.cpp
3665 lines (3071 loc) · 125 KB
/
stubGenerator_ppc.cpp
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/*
* Copyright (c) 1997, 2019, Oracle and/or its affiliates. All rights reserved.
* Copyright (c) 2012, 2019 SAP SE. 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 Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA
* or visit www.oracle.com if you need additional information or have any
* questions.
*
*/
#include "precompiled.hpp"
#include "asm/macroAssembler.inline.hpp"
#include "gc/shared/barrierSet.hpp"
#include "gc/shared/barrierSetAssembler.hpp"
#include "interpreter/interpreter.hpp"
#include "nativeInst_ppc.hpp"
#include "oops/instanceOop.hpp"
#include "oops/method.hpp"
#include "oops/objArrayKlass.hpp"
#include "oops/oop.inline.hpp"
#include "prims/methodHandles.hpp"
#include "runtime/frame.inline.hpp"
#include "runtime/handles.inline.hpp"
#include "runtime/sharedRuntime.hpp"
#include "runtime/stubCodeGenerator.hpp"
#include "runtime/stubRoutines.hpp"
#include "runtime/thread.inline.hpp"
#include "utilities/align.hpp"
#include "utilities/powerOfTwo.hpp"
// Declaration and definition of StubGenerator (no .hpp file).
// For a more detailed description of the stub routine structure
// see the comment in stubRoutines.hpp.
#define __ _masm->
#ifdef PRODUCT
#define BLOCK_COMMENT(str) // nothing
#else
#define BLOCK_COMMENT(str) __ block_comment(str)
#endif
#if defined(ABI_ELFv2)
#define STUB_ENTRY(name) StubRoutines::name()
#else
#define STUB_ENTRY(name) ((FunctionDescriptor*)StubRoutines::name())->entry()
#endif
class StubGenerator: public StubCodeGenerator {
private:
// Call stubs are used to call Java from C
//
// Arguments:
//
// R3 - call wrapper address : address
// R4 - result : intptr_t*
// R5 - result type : BasicType
// R6 - method : Method
// R7 - frame mgr entry point : address
// R8 - parameter block : intptr_t*
// R9 - parameter count in words : int
// R10 - thread : Thread*
//
address generate_call_stub(address& return_address) {
// Setup a new c frame, copy java arguments, call frame manager or
// native_entry, and process result.
StubCodeMark mark(this, "StubRoutines", "call_stub");
address start = __ function_entry();
// some sanity checks
assert((sizeof(frame::abi_minframe) % 16) == 0, "unaligned");
assert((sizeof(frame::abi_reg_args) % 16) == 0, "unaligned");
assert((sizeof(frame::spill_nonvolatiles) % 16) == 0, "unaligned");
assert((sizeof(frame::parent_ijava_frame_abi) % 16) == 0, "unaligned");
assert((sizeof(frame::entry_frame_locals) % 16) == 0, "unaligned");
Register r_arg_call_wrapper_addr = R3;
Register r_arg_result_addr = R4;
Register r_arg_result_type = R5;
Register r_arg_method = R6;
Register r_arg_entry = R7;
Register r_arg_thread = R10;
Register r_temp = R24;
Register r_top_of_arguments_addr = R25;
Register r_entryframe_fp = R26;
{
// Stack on entry to call_stub:
//
// F1 [C_FRAME]
// ...
Register r_arg_argument_addr = R8;
Register r_arg_argument_count = R9;
Register r_frame_alignment_in_bytes = R27;
Register r_argument_addr = R28;
Register r_argumentcopy_addr = R29;
Register r_argument_size_in_bytes = R30;
Register r_frame_size = R23;
Label arguments_copied;
// Save LR/CR to caller's C_FRAME.
__ save_LR_CR(R0);
// Zero extend arg_argument_count.
__ clrldi(r_arg_argument_count, r_arg_argument_count, 32);
// Save non-volatiles GPRs to ENTRY_FRAME (not yet pushed, but it's safe).
__ save_nonvolatile_gprs(R1_SP, _spill_nonvolatiles_neg(r14));
// Keep copy of our frame pointer (caller's SP).
__ mr(r_entryframe_fp, R1_SP);
BLOCK_COMMENT("Push ENTRY_FRAME including arguments");
// Push ENTRY_FRAME including arguments:
//
// F0 [TOP_IJAVA_FRAME_ABI]
// alignment (optional)
// [outgoing Java arguments]
// [ENTRY_FRAME_LOCALS]
// F1 [C_FRAME]
// ...
// calculate frame size
// unaligned size of arguments
__ sldi(r_argument_size_in_bytes,
r_arg_argument_count, Interpreter::logStackElementSize);
// arguments alignment (max 1 slot)
// FIXME: use round_to() here
__ andi_(r_frame_alignment_in_bytes, r_arg_argument_count, 1);
__ sldi(r_frame_alignment_in_bytes,
r_frame_alignment_in_bytes, Interpreter::logStackElementSize);
// size = unaligned size of arguments + top abi's size
__ addi(r_frame_size, r_argument_size_in_bytes,
frame::top_ijava_frame_abi_size);
// size += arguments alignment
__ add(r_frame_size,
r_frame_size, r_frame_alignment_in_bytes);
// size += size of call_stub locals
__ addi(r_frame_size,
r_frame_size, frame::entry_frame_locals_size);
// push ENTRY_FRAME
__ push_frame(r_frame_size, r_temp);
// initialize call_stub locals (step 1)
__ std(r_arg_call_wrapper_addr,
_entry_frame_locals_neg(call_wrapper_address), r_entryframe_fp);
__ std(r_arg_result_addr,
_entry_frame_locals_neg(result_address), r_entryframe_fp);
__ std(r_arg_result_type,
_entry_frame_locals_neg(result_type), r_entryframe_fp);
// we will save arguments_tos_address later
BLOCK_COMMENT("Copy Java arguments");
// copy Java arguments
// Calculate top_of_arguments_addr which will be R17_tos (not prepushed) later.
// FIXME: why not simply use SP+frame::top_ijava_frame_size?
__ addi(r_top_of_arguments_addr,
R1_SP, frame::top_ijava_frame_abi_size);
__ add(r_top_of_arguments_addr,
r_top_of_arguments_addr, r_frame_alignment_in_bytes);
// any arguments to copy?
__ cmpdi(CCR0, r_arg_argument_count, 0);
__ beq(CCR0, arguments_copied);
// prepare loop and copy arguments in reverse order
{
// init CTR with arg_argument_count
__ mtctr(r_arg_argument_count);
// let r_argumentcopy_addr point to last outgoing Java arguments P
__ mr(r_argumentcopy_addr, r_top_of_arguments_addr);
// let r_argument_addr point to last incoming java argument
__ add(r_argument_addr,
r_arg_argument_addr, r_argument_size_in_bytes);
__ addi(r_argument_addr, r_argument_addr, -BytesPerWord);
// now loop while CTR > 0 and copy arguments
{
Label next_argument;
__ bind(next_argument);
__ ld(r_temp, 0, r_argument_addr);
// argument_addr--;
__ addi(r_argument_addr, r_argument_addr, -BytesPerWord);
__ std(r_temp, 0, r_argumentcopy_addr);
// argumentcopy_addr++;
__ addi(r_argumentcopy_addr, r_argumentcopy_addr, BytesPerWord);
__ bdnz(next_argument);
}
}
// Arguments copied, continue.
__ bind(arguments_copied);
}
{
BLOCK_COMMENT("Call frame manager or native entry.");
// Call frame manager or native entry.
Register r_new_arg_entry = R14;
assert_different_registers(r_new_arg_entry, r_top_of_arguments_addr,
r_arg_method, r_arg_thread);
__ mr(r_new_arg_entry, r_arg_entry);
// Register state on entry to frame manager / native entry:
//
// tos - intptr_t* sender tos (prepushed) Lesp = (SP) + copied_arguments_offset - 8
// R19_method - Method
// R16_thread - JavaThread*
// Tos must point to last argument - element_size.
const Register tos = R15_esp;
__ addi(tos, r_top_of_arguments_addr, -Interpreter::stackElementSize);
// initialize call_stub locals (step 2)
// now save tos as arguments_tos_address
__ std(tos, _entry_frame_locals_neg(arguments_tos_address), r_entryframe_fp);
// load argument registers for call
__ mr(R19_method, r_arg_method);
__ mr(R16_thread, r_arg_thread);
assert(tos != r_arg_method, "trashed r_arg_method");
assert(tos != r_arg_thread && R19_method != r_arg_thread, "trashed r_arg_thread");
// Set R15_prev_state to 0 for simplifying checks in callee.
__ load_const_optimized(R25_templateTableBase, (address)Interpreter::dispatch_table((TosState)0), R11_scratch1);
// Stack on entry to frame manager / native entry:
//
// F0 [TOP_IJAVA_FRAME_ABI]
// alignment (optional)
// [outgoing Java arguments]
// [ENTRY_FRAME_LOCALS]
// F1 [C_FRAME]
// ...
//
// global toc register
__ load_const_optimized(R29_TOC, MacroAssembler::global_toc(), R11_scratch1);
// Remember the senderSP so we interpreter can pop c2i arguments off of the stack
// when called via a c2i.
// Pass initial_caller_sp to framemanager.
__ mr(R21_sender_SP, R1_SP);
// Do a light-weight C-call here, r_new_arg_entry holds the address
// of the interpreter entry point (frame manager or native entry)
// and save runtime-value of LR in return_address.
assert(r_new_arg_entry != tos && r_new_arg_entry != R19_method && r_new_arg_entry != R16_thread,
"trashed r_new_arg_entry");
return_address = __ call_stub(r_new_arg_entry);
}
{
BLOCK_COMMENT("Returned from frame manager or native entry.");
// Returned from frame manager or native entry.
// Now pop frame, process result, and return to caller.
// Stack on exit from frame manager / native entry:
//
// F0 [ABI]
// ...
// [ENTRY_FRAME_LOCALS]
// F1 [C_FRAME]
// ...
//
// Just pop the topmost frame ...
//
Label ret_is_object;
Label ret_is_long;
Label ret_is_float;
Label ret_is_double;
Register r_entryframe_fp = R30;
Register r_lr = R7_ARG5;
Register r_cr = R8_ARG6;
// Reload some volatile registers which we've spilled before the call
// to frame manager / native entry.
// Access all locals via frame pointer, because we know nothing about
// the topmost frame's size.
__ ld(r_entryframe_fp, _abi(callers_sp), R1_SP);
assert_different_registers(r_entryframe_fp, R3_RET, r_arg_result_addr, r_arg_result_type, r_cr, r_lr);
__ ld(r_arg_result_addr,
_entry_frame_locals_neg(result_address), r_entryframe_fp);
__ ld(r_arg_result_type,
_entry_frame_locals_neg(result_type), r_entryframe_fp);
__ ld(r_cr, _abi(cr), r_entryframe_fp);
__ ld(r_lr, _abi(lr), r_entryframe_fp);
// pop frame and restore non-volatiles, LR and CR
__ mr(R1_SP, r_entryframe_fp);
__ mtcr(r_cr);
__ mtlr(r_lr);
// Store result depending on type. Everything that is not
// T_OBJECT, T_LONG, T_FLOAT, or T_DOUBLE is treated as T_INT.
__ cmpwi(CCR0, r_arg_result_type, T_OBJECT);
__ cmpwi(CCR1, r_arg_result_type, T_LONG);
__ cmpwi(CCR5, r_arg_result_type, T_FLOAT);
__ cmpwi(CCR6, r_arg_result_type, T_DOUBLE);
// restore non-volatile registers
__ restore_nonvolatile_gprs(R1_SP, _spill_nonvolatiles_neg(r14));
// Stack on exit from call_stub:
//
// 0 [C_FRAME]
// ...
//
// no call_stub frames left.
// All non-volatiles have been restored at this point!!
assert(R3_RET == R3, "R3_RET should be R3");
__ beq(CCR0, ret_is_object);
__ beq(CCR1, ret_is_long);
__ beq(CCR5, ret_is_float);
__ beq(CCR6, ret_is_double);
// default:
__ stw(R3_RET, 0, r_arg_result_addr);
__ blr(); // return to caller
// case T_OBJECT:
__ bind(ret_is_object);
__ std(R3_RET, 0, r_arg_result_addr);
__ blr(); // return to caller
// case T_LONG:
__ bind(ret_is_long);
__ std(R3_RET, 0, r_arg_result_addr);
__ blr(); // return to caller
// case T_FLOAT:
__ bind(ret_is_float);
__ stfs(F1_RET, 0, r_arg_result_addr);
__ blr(); // return to caller
// case T_DOUBLE:
__ bind(ret_is_double);
__ stfd(F1_RET, 0, r_arg_result_addr);
__ blr(); // return to caller
}
return start;
}
// Return point for a Java call if there's an exception thrown in
// Java code. The exception is caught and transformed into a
// pending exception stored in JavaThread that can be tested from
// within the VM.
//
address generate_catch_exception() {
StubCodeMark mark(this, "StubRoutines", "catch_exception");
address start = __ pc();
// Registers alive
//
// R16_thread
// R3_ARG1 - address of pending exception
// R4_ARG2 - return address in call stub
const Register exception_file = R21_tmp1;
const Register exception_line = R22_tmp2;
__ load_const(exception_file, (void*)__FILE__);
__ load_const(exception_line, (void*)__LINE__);
__ std(R3_ARG1, in_bytes(JavaThread::pending_exception_offset()), R16_thread);
// store into `char *'
__ std(exception_file, in_bytes(JavaThread::exception_file_offset()), R16_thread);
// store into `int'
__ stw(exception_line, in_bytes(JavaThread::exception_line_offset()), R16_thread);
// complete return to VM
assert(StubRoutines::_call_stub_return_address != NULL, "must have been generated before");
__ mtlr(R4_ARG2);
// continue in call stub
__ blr();
return start;
}
// Continuation point for runtime calls returning with a pending
// exception. The pending exception check happened in the runtime
// or native call stub. The pending exception in Thread is
// converted into a Java-level exception.
//
// Read:
//
// LR: The pc the runtime library callee wants to return to.
// Since the exception occurred in the callee, the return pc
// from the point of view of Java is the exception pc.
// thread: Needed for method handles.
//
// Invalidate:
//
// volatile registers (except below).
//
// Update:
//
// R4_ARG2: exception
//
// (LR is unchanged and is live out).
//
address generate_forward_exception() {
StubCodeMark mark(this, "StubRoutines", "forward_exception");
address start = __ pc();
if (VerifyOops) {
// Get pending exception oop.
__ ld(R3_ARG1,
in_bytes(Thread::pending_exception_offset()),
R16_thread);
// Make sure that this code is only executed if there is a pending exception.
{
Label L;
__ cmpdi(CCR0, R3_ARG1, 0);
__ bne(CCR0, L);
__ stop("StubRoutines::forward exception: no pending exception (1)");
__ bind(L);
}
__ verify_oop(R3_ARG1, "StubRoutines::forward exception: not an oop");
}
// Save LR/CR and copy exception pc (LR) into R4_ARG2.
__ save_LR_CR(R4_ARG2);
__ push_frame_reg_args(0, R0);
// Find exception handler.
__ call_VM_leaf(CAST_FROM_FN_PTR(address,
SharedRuntime::exception_handler_for_return_address),
R16_thread,
R4_ARG2);
// Copy handler's address.
__ mtctr(R3_RET);
__ pop_frame();
__ restore_LR_CR(R0);
// Set up the arguments for the exception handler:
// - R3_ARG1: exception oop
// - R4_ARG2: exception pc.
// Load pending exception oop.
__ ld(R3_ARG1,
in_bytes(Thread::pending_exception_offset()),
R16_thread);
// The exception pc is the return address in the caller.
// Must load it into R4_ARG2.
__ mflr(R4_ARG2);
#ifdef ASSERT
// Make sure exception is set.
{
Label L;
__ cmpdi(CCR0, R3_ARG1, 0);
__ bne(CCR0, L);
__ stop("StubRoutines::forward exception: no pending exception (2)");
__ bind(L);
}
#endif
// Clear the pending exception.
__ li(R0, 0);
__ std(R0,
in_bytes(Thread::pending_exception_offset()),
R16_thread);
// Jump to exception handler.
__ bctr();
return start;
}
#undef __
#define __ masm->
// Continuation point for throwing of implicit exceptions that are
// not handled in the current activation. Fabricates an exception
// oop and initiates normal exception dispatching in this
// frame. Only callee-saved registers are preserved (through the
// normal register window / RegisterMap handling). If the compiler
// needs all registers to be preserved between the fault point and
// the exception handler then it must assume responsibility for that
// in AbstractCompiler::continuation_for_implicit_null_exception or
// continuation_for_implicit_division_by_zero_exception. All other
// implicit exceptions (e.g., NullPointerException or
// AbstractMethodError on entry) are either at call sites or
// otherwise assume that stack unwinding will be initiated, so
// caller saved registers were assumed volatile in the compiler.
//
// Note that we generate only this stub into a RuntimeStub, because
// it needs to be properly traversed and ignored during GC, so we
// change the meaning of the "__" macro within this method.
//
// Note: the routine set_pc_not_at_call_for_caller in
// SharedRuntime.cpp requires that this code be generated into a
// RuntimeStub.
address generate_throw_exception(const char* name, address runtime_entry, bool restore_saved_exception_pc,
Register arg1 = noreg, Register arg2 = noreg) {
CodeBuffer code(name, 1024 DEBUG_ONLY(+ 512), 0);
MacroAssembler* masm = new MacroAssembler(&code);
OopMapSet* oop_maps = new OopMapSet();
int frame_size_in_bytes = frame::abi_reg_args_size;
OopMap* map = new OopMap(frame_size_in_bytes / sizeof(jint), 0);
address start = __ pc();
__ save_LR_CR(R11_scratch1);
// Push a frame.
__ push_frame_reg_args(0, R11_scratch1);
address frame_complete_pc = __ pc();
if (restore_saved_exception_pc) {
__ unimplemented("StubGenerator::throw_exception with restore_saved_exception_pc");
}
// Note that we always have a runtime stub frame on the top of
// stack by this point. Remember the offset of the instruction
// whose address will be moved to R11_scratch1.
address gc_map_pc = __ get_PC_trash_LR(R11_scratch1);
__ set_last_Java_frame(/*sp*/R1_SP, /*pc*/R11_scratch1);
__ mr(R3_ARG1, R16_thread);
if (arg1 != noreg) {
__ mr(R4_ARG2, arg1);
}
if (arg2 != noreg) {
__ mr(R5_ARG3, arg2);
}
#if defined(ABI_ELFv2)
__ call_c(runtime_entry, relocInfo::none);
#else
__ call_c(CAST_FROM_FN_PTR(FunctionDescriptor*, runtime_entry), relocInfo::none);
#endif
// Set an oopmap for the call site.
oop_maps->add_gc_map((int)(gc_map_pc - start), map);
__ reset_last_Java_frame();
#ifdef ASSERT
// Make sure that this code is only executed if there is a pending
// exception.
{
Label L;
__ ld(R0,
in_bytes(Thread::pending_exception_offset()),
R16_thread);
__ cmpdi(CCR0, R0, 0);
__ bne(CCR0, L);
__ stop("StubRoutines::throw_exception: no pending exception");
__ bind(L);
}
#endif
// Pop frame.
__ pop_frame();
__ restore_LR_CR(R11_scratch1);
__ load_const(R11_scratch1, StubRoutines::forward_exception_entry());
__ mtctr(R11_scratch1);
__ bctr();
// Create runtime stub with OopMap.
RuntimeStub* stub =
RuntimeStub::new_runtime_stub(name, &code,
/*frame_complete=*/ (int)(frame_complete_pc - start),
frame_size_in_bytes/wordSize,
oop_maps,
false);
return stub->entry_point();
}
#undef __
#define __ _masm->
// Support for void zero_words_aligned8(HeapWord* to, size_t count)
//
// Arguments:
// to:
// count:
//
// Destroys:
//
address generate_zero_words_aligned8() {
StubCodeMark mark(this, "StubRoutines", "zero_words_aligned8");
// Implemented as in ClearArray.
address start = __ function_entry();
Register base_ptr_reg = R3_ARG1; // tohw (needs to be 8b aligned)
Register cnt_dwords_reg = R4_ARG2; // count (in dwords)
Register tmp1_reg = R5_ARG3;
Register tmp2_reg = R6_ARG4;
Register zero_reg = R7_ARG5;
// Procedure for large arrays (uses data cache block zero instruction).
Label dwloop, fast, fastloop, restloop, lastdword, done;
int cl_size = VM_Version::L1_data_cache_line_size();
int cl_dwords = cl_size >> 3;
int cl_dwordaddr_bits = exact_log2(cl_dwords);
int min_dcbz = 2; // Needs to be positive, apply dcbz only to at least min_dcbz cache lines.
// Clear up to 128byte boundary if long enough, dword_cnt=(16-(base>>3))%16.
__ dcbtst(base_ptr_reg); // Indicate write access to first cache line ...
__ andi(tmp2_reg, cnt_dwords_reg, 1); // to check if number of dwords is even.
__ srdi_(tmp1_reg, cnt_dwords_reg, 1); // number of double dwords
__ load_const_optimized(zero_reg, 0L); // Use as zero register.
__ cmpdi(CCR1, tmp2_reg, 0); // cnt_dwords even?
__ beq(CCR0, lastdword); // size <= 1
__ mtctr(tmp1_reg); // Speculatively preload counter for rest loop (>0).
__ cmpdi(CCR0, cnt_dwords_reg, (min_dcbz+1)*cl_dwords-1); // Big enough to ensure >=min_dcbz cache lines are included?
__ neg(tmp1_reg, base_ptr_reg); // bit 0..58: bogus, bit 57..60: (16-(base>>3))%16, bit 61..63: 000
__ blt(CCR0, restloop); // Too small. (<31=(2*cl_dwords)-1 is sufficient, but bigger performs better.)
__ rldicl_(tmp1_reg, tmp1_reg, 64-3, 64-cl_dwordaddr_bits); // Extract number of dwords to 128byte boundary=(16-(base>>3))%16.
__ beq(CCR0, fast); // already 128byte aligned
__ mtctr(tmp1_reg); // Set ctr to hit 128byte boundary (0<ctr<cnt).
__ subf(cnt_dwords_reg, tmp1_reg, cnt_dwords_reg); // rest (>0 since size>=256-8)
// Clear in first cache line dword-by-dword if not already 128byte aligned.
__ bind(dwloop);
__ std(zero_reg, 0, base_ptr_reg); // Clear 8byte aligned block.
__ addi(base_ptr_reg, base_ptr_reg, 8);
__ bdnz(dwloop);
// clear 128byte blocks
__ bind(fast);
__ srdi(tmp1_reg, cnt_dwords_reg, cl_dwordaddr_bits); // loop count for 128byte loop (>0 since size>=256-8)
__ andi(tmp2_reg, cnt_dwords_reg, 1); // to check if rest even
__ mtctr(tmp1_reg); // load counter
__ cmpdi(CCR1, tmp2_reg, 0); // rest even?
__ rldicl_(tmp1_reg, cnt_dwords_reg, 63, 65-cl_dwordaddr_bits); // rest in double dwords
__ bind(fastloop);
__ dcbz(base_ptr_reg); // Clear 128byte aligned block.
__ addi(base_ptr_reg, base_ptr_reg, cl_size);
__ bdnz(fastloop);
//__ dcbtst(base_ptr_reg); // Indicate write access to last cache line.
__ beq(CCR0, lastdword); // rest<=1
__ mtctr(tmp1_reg); // load counter
// Clear rest.
__ bind(restloop);
__ std(zero_reg, 0, base_ptr_reg); // Clear 8byte aligned block.
__ std(zero_reg, 8, base_ptr_reg); // Clear 8byte aligned block.
__ addi(base_ptr_reg, base_ptr_reg, 16);
__ bdnz(restloop);
__ bind(lastdword);
__ beq(CCR1, done);
__ std(zero_reg, 0, base_ptr_reg);
__ bind(done);
__ blr(); // return
return start;
}
#if !defined(PRODUCT)
// Wrapper which calls oopDesc::is_oop_or_null()
// Only called by MacroAssembler::verify_oop
static void verify_oop_helper(const char* message, oopDesc* o) {
if (!oopDesc::is_oop_or_null(o)) {
fatal("%s. oop: " PTR_FORMAT, message, p2i(o));
}
++ StubRoutines::_verify_oop_count;
}
#endif
// Return address of code to be called from code generated by
// MacroAssembler::verify_oop.
//
// Don't generate, rather use C++ code.
address generate_verify_oop() {
// this is actually a `FunctionDescriptor*'.
address start = 0;
#if !defined(PRODUCT)
start = CAST_FROM_FN_PTR(address, verify_oop_helper);
#endif
return start;
}
// -XX:+OptimizeFill : convert fill/copy loops into intrinsic
//
// The code is implemented(ported from sparc) as we believe it benefits JVM98, however
// tracing(-XX:+TraceOptimizeFill) shows the intrinsic replacement doesn't happen at all!
//
// Source code in function is_range_check_if() shows that OptimizeFill relaxed the condition
// for turning on loop predication optimization, and hence the behavior of "array range check"
// and "loop invariant check" could be influenced, which potentially boosted JVM98.
//
// Generate stub for disjoint short fill. If "aligned" is true, the
// "to" address is assumed to be heapword aligned.
//
// Arguments for generated stub:
// to: R3_ARG1
// value: R4_ARG2
// count: R5_ARG3 treated as signed
//
address generate_fill(BasicType t, bool aligned, const char* name) {
StubCodeMark mark(this, "StubRoutines", name);
address start = __ function_entry();
const Register to = R3_ARG1; // source array address
const Register value = R4_ARG2; // fill value
const Register count = R5_ARG3; // elements count
const Register temp = R6_ARG4; // temp register
//assert_clean_int(count, O3); // Make sure 'count' is clean int.
Label L_exit, L_skip_align1, L_skip_align2, L_fill_byte;
Label L_fill_2_bytes, L_fill_4_bytes, L_fill_elements, L_fill_32_bytes;
int shift = -1;
switch (t) {
case T_BYTE:
shift = 2;
// Clone bytes (zero extend not needed because store instructions below ignore high order bytes).
__ rldimi(value, value, 8, 48); // 8 bit -> 16 bit
__ cmpdi(CCR0, count, 2<<shift); // Short arrays (< 8 bytes) fill by element.
__ blt(CCR0, L_fill_elements);
__ rldimi(value, value, 16, 32); // 16 bit -> 32 bit
break;
case T_SHORT:
shift = 1;
// Clone bytes (zero extend not needed because store instructions below ignore high order bytes).
__ rldimi(value, value, 16, 32); // 16 bit -> 32 bit
__ cmpdi(CCR0, count, 2<<shift); // Short arrays (< 8 bytes) fill by element.
__ blt(CCR0, L_fill_elements);
break;
case T_INT:
shift = 0;
__ cmpdi(CCR0, count, 2<<shift); // Short arrays (< 8 bytes) fill by element.
__ blt(CCR0, L_fill_4_bytes);
break;
default: ShouldNotReachHere();
}
if (!aligned && (t == T_BYTE || t == T_SHORT)) {
// Align source address at 4 bytes address boundary.
if (t == T_BYTE) {
// One byte misalignment happens only for byte arrays.
__ andi_(temp, to, 1);
__ beq(CCR0, L_skip_align1);
__ stb(value, 0, to);
__ addi(to, to, 1);
__ addi(count, count, -1);
__ bind(L_skip_align1);
}
// Two bytes misalignment happens only for byte and short (char) arrays.
__ andi_(temp, to, 2);
__ beq(CCR0, L_skip_align2);
__ sth(value, 0, to);
__ addi(to, to, 2);
__ addi(count, count, -(1 << (shift - 1)));
__ bind(L_skip_align2);
}
if (!aligned) {
// Align to 8 bytes, we know we are 4 byte aligned to start.
__ andi_(temp, to, 7);
__ beq(CCR0, L_fill_32_bytes);
__ stw(value, 0, to);
__ addi(to, to, 4);
__ addi(count, count, -(1 << shift));
__ bind(L_fill_32_bytes);
}
__ li(temp, 8<<shift); // Prepare for 32 byte loop.
// Clone bytes int->long as above.
__ rldimi(value, value, 32, 0); // 32 bit -> 64 bit
Label L_check_fill_8_bytes;
// Fill 32-byte chunks.
__ subf_(count, temp, count);
__ blt(CCR0, L_check_fill_8_bytes);
Label L_fill_32_bytes_loop;
__ align(32);
__ bind(L_fill_32_bytes_loop);
__ std(value, 0, to);
__ std(value, 8, to);
__ subf_(count, temp, count); // Update count.
__ std(value, 16, to);
__ std(value, 24, to);
__ addi(to, to, 32);
__ bge(CCR0, L_fill_32_bytes_loop);
__ bind(L_check_fill_8_bytes);
__ add_(count, temp, count);
__ beq(CCR0, L_exit);
__ addic_(count, count, -(2 << shift));
__ blt(CCR0, L_fill_4_bytes);
//
// Length is too short, just fill 8 bytes at a time.
//
Label L_fill_8_bytes_loop;
__ bind(L_fill_8_bytes_loop);
__ std(value, 0, to);
__ addic_(count, count, -(2 << shift));
__ addi(to, to, 8);
__ bge(CCR0, L_fill_8_bytes_loop);
// Fill trailing 4 bytes.
__ bind(L_fill_4_bytes);
__ andi_(temp, count, 1<<shift);
__ beq(CCR0, L_fill_2_bytes);
__ stw(value, 0, to);
if (t == T_BYTE || t == T_SHORT) {
__ addi(to, to, 4);
// Fill trailing 2 bytes.
__ bind(L_fill_2_bytes);
__ andi_(temp, count, 1<<(shift-1));
__ beq(CCR0, L_fill_byte);
__ sth(value, 0, to);
if (t == T_BYTE) {
__ addi(to, to, 2);
// Fill trailing byte.
__ bind(L_fill_byte);
__ andi_(count, count, 1);
__ beq(CCR0, L_exit);
__ stb(value, 0, to);
} else {
__ bind(L_fill_byte);
}
} else {
__ bind(L_fill_2_bytes);
}
__ bind(L_exit);
__ blr();
// Handle copies less than 8 bytes. Int is handled elsewhere.
if (t == T_BYTE) {
__ bind(L_fill_elements);
Label L_fill_2, L_fill_4;
__ andi_(temp, count, 1);
__ beq(CCR0, L_fill_2);
__ stb(value, 0, to);
__ addi(to, to, 1);
__ bind(L_fill_2);
__ andi_(temp, count, 2);
__ beq(CCR0, L_fill_4);
__ stb(value, 0, to);
__ stb(value, 0, to);
__ addi(to, to, 2);
__ bind(L_fill_4);
__ andi_(temp, count, 4);
__ beq(CCR0, L_exit);
__ stb(value, 0, to);
__ stb(value, 1, to);
__ stb(value, 2, to);
__ stb(value, 3, to);
__ blr();
}
if (t == T_SHORT) {
Label L_fill_2;
__ bind(L_fill_elements);
__ andi_(temp, count, 1);
__ beq(CCR0, L_fill_2);
__ sth(value, 0, to);
__ addi(to, to, 2);
__ bind(L_fill_2);
__ andi_(temp, count, 2);
__ beq(CCR0, L_exit);
__ sth(value, 0, to);
__ sth(value, 2, to);
__ blr();
}
return start;
}
inline void assert_positive_int(Register count) {
#ifdef ASSERT
__ srdi_(R0, count, 31);
__ asm_assert_eq("missing zero extend");
#endif
}
// Generate overlap test for array copy stubs.
//
// Input:
// R3_ARG1 - from
// R4_ARG2 - to
// R5_ARG3 - element count
//
void array_overlap_test(address no_overlap_target, int log2_elem_size) {
Register tmp1 = R6_ARG4;
Register tmp2 = R7_ARG5;
assert_positive_int(R5_ARG3);
__ subf(tmp1, R3_ARG1, R4_ARG2); // distance in bytes
__ sldi(tmp2, R5_ARG3, log2_elem_size); // size in bytes
__ cmpld(CCR0, R3_ARG1, R4_ARG2); // Use unsigned comparison!
__ cmpld(CCR1, tmp1, tmp2);
__ crnand(CCR0, Assembler::less, CCR1, Assembler::less);
// Overlaps if Src before dst and distance smaller than size.
// Branch to forward copy routine otherwise (within range of 32kB).
__ bc(Assembler::bcondCRbiIs1, Assembler::bi0(CCR0, Assembler::less), no_overlap_target);
// need to copy backwards
}
// This is common errorexit stub for UnsafeCopyMemory.
address generate_unsafecopy_common_error_exit() {
address start_pc = __ pc();
Register tmp1 = R6_ARG4;
// probably copy stub would have changed value reset it.
if (VM_Version::has_mfdscr()) {
__ load_const_optimized(tmp1, VM_Version::_dscr_val);
__ mtdscr(tmp1);
}
__ li(R3_RET, 0); // return 0
__ blr();
return start_pc;
}
// The guideline in the implementations of generate_disjoint_xxx_copy
// (xxx=byte,short,int,long,oop) is to copy as many elements as possible with
// single instructions, but to avoid alignment interrupts (see subsequent
// comment). Furthermore, we try to minimize misaligned access, even
// though they cause no alignment interrupt.
//
// In Big-Endian mode, the PowerPC architecture requires implementations to
// handle automatically misaligned integer halfword and word accesses,
// word-aligned integer doubleword accesses, and word-aligned floating-point
// accesses. Other accesses may or may not generate an Alignment interrupt
// depending on the implementation.
// Alignment interrupt handling may require on the order of hundreds of cycles,
// so every effort should be made to avoid misaligned memory values.
//
//
// Generate stub for disjoint byte copy. If "aligned" is true, the
// "from" and "to" addresses are assumed to be heapword aligned.
//
// Arguments for generated stub:
// from: R3_ARG1
// to: R4_ARG2
// count: R5_ARG3 treated as signed
//
address generate_disjoint_byte_copy(bool aligned, const char * name) {
StubCodeMark mark(this, "StubRoutines", name);
address start = __ function_entry();
assert_positive_int(R5_ARG3);
Register tmp1 = R6_ARG4;
Register tmp2 = R7_ARG5;
Register tmp3 = R8_ARG6;
Register tmp4 = R9_ARG7;
VectorSRegister tmp_vsr1 = VSR1;