| /* |
| * Copyright (c) 2003, 2016, Oracle and/or its affiliates. All rights reserved. |
| * Copyright (c) 2014, 2015, Red Hat 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 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.hpp" |
| #include "asm/macroAssembler.inline.hpp" |
| #include "code/debugInfoRec.hpp" |
| #include "code/icBuffer.hpp" |
| #include "code/vtableStubs.hpp" |
| #include "interpreter/interpreter.hpp" |
| #include "interpreter/interp_masm.hpp" |
| #include "memory/resourceArea.hpp" |
| #include "oops/compiledICHolder.hpp" |
| #include "prims/jvmtiRedefineClassesTrace.hpp" |
| #include "runtime/sharedRuntime.hpp" |
| #include "runtime/vframeArray.hpp" |
| #include "vmreg_aarch64.inline.hpp" |
| #ifdef COMPILER1 |
| #include "c1/c1_Runtime1.hpp" |
| #endif |
| #if defined(COMPILER2) || INCLUDE_JVMCI |
| #include "adfiles/ad_aarch64.hpp" |
| #include "opto/runtime.hpp" |
| #endif |
| #if INCLUDE_JVMCI |
| #include "jvmci/jvmciJavaClasses.hpp" |
| #endif |
| |
| #ifdef BUILTIN_SIM |
| #include "../../../../../../simulator/simulator.hpp" |
| #endif |
| |
| #define __ masm-> |
| |
| const int StackAlignmentInSlots = StackAlignmentInBytes / VMRegImpl::stack_slot_size; |
| |
| class SimpleRuntimeFrame { |
| |
| public: |
| |
| // Most of the runtime stubs have this simple frame layout. |
| // This class exists to make the layout shared in one place. |
| // Offsets are for compiler stack slots, which are jints. |
| enum layout { |
| // The frame sender code expects that rbp will be in the "natural" place and |
| // will override any oopMap setting for it. We must therefore force the layout |
| // so that it agrees with the frame sender code. |
| // we don't expect any arg reg save area so aarch64 asserts that |
| // frame::arg_reg_save_area_bytes == 0 |
| rbp_off = 0, |
| rbp_off2, |
| return_off, return_off2, |
| framesize |
| }; |
| }; |
| |
| // FIXME -- this is used by C1 |
| class RegisterSaver { |
| public: |
| static OopMap* save_live_registers(MacroAssembler* masm, int additional_frame_words, int* total_frame_words, bool save_vectors = false); |
| static void restore_live_registers(MacroAssembler* masm, bool restore_vectors = false); |
| |
| // Offsets into the register save area |
| // Used by deoptimization when it is managing result register |
| // values on its own |
| |
| static int r0_offset_in_bytes(void) { return (32 + r0->encoding()) * wordSize; } |
| static int reg_offset_in_bytes(Register r) { return r0_offset_in_bytes() + r->encoding() * wordSize; } |
| static int rmethod_offset_in_bytes(void) { return reg_offset_in_bytes(rmethod); } |
| static int rscratch1_offset_in_bytes(void) { return (32 + rscratch1->encoding()) * wordSize; } |
| static int v0_offset_in_bytes(void) { return 0; } |
| static int return_offset_in_bytes(void) { return (32 /* floats*/ + 31 /* gregs*/) * wordSize; } |
| |
| // During deoptimization only the result registers need to be restored, |
| // all the other values have already been extracted. |
| static void restore_result_registers(MacroAssembler* masm); |
| |
| // Capture info about frame layout |
| enum layout { |
| fpu_state_off = 0, |
| fpu_state_end = fpu_state_off+FPUStateSizeInWords-1, |
| // The frame sender code expects that rfp will be in |
| // the "natural" place and will override any oopMap |
| // setting for it. We must therefore force the layout |
| // so that it agrees with the frame sender code. |
| r0_off = fpu_state_off+FPUStateSizeInWords, |
| rfp_off = r0_off + 30 * 2, |
| return_off = rfp_off + 2, // slot for return address |
| reg_save_size = return_off + 2}; |
| |
| }; |
| |
| OopMap* RegisterSaver::save_live_registers(MacroAssembler* masm, int additional_frame_words, int* total_frame_words, bool save_vectors) { |
| #if defined(COMPILER2) || INCLUDE_JVMCI |
| if (save_vectors) { |
| // Save upper half of vector registers |
| int vect_words = 32 * 8 / wordSize; |
| additional_frame_words += vect_words; |
| } |
| #else |
| assert(!save_vectors, "vectors are generated only by C2 and JVMCI"); |
| #endif |
| |
| int frame_size_in_bytes = round_to(additional_frame_words*wordSize + |
| reg_save_size*BytesPerInt, 16); |
| // OopMap frame size is in compiler stack slots (jint's) not bytes or words |
| int frame_size_in_slots = frame_size_in_bytes / BytesPerInt; |
| // The caller will allocate additional_frame_words |
| int additional_frame_slots = additional_frame_words*wordSize / BytesPerInt; |
| // CodeBlob frame size is in words. |
| int frame_size_in_words = frame_size_in_bytes / wordSize; |
| *total_frame_words = frame_size_in_words; |
| |
| // Save registers, fpu state, and flags. |
| |
| __ enter(); |
| __ push_CPU_state(save_vectors); |
| |
| // Set an oopmap for the call site. This oopmap will map all |
| // oop-registers and debug-info registers as callee-saved. This |
| // will allow deoptimization at this safepoint to find all possible |
| // debug-info recordings, as well as let GC find all oops. |
| |
| OopMapSet *oop_maps = new OopMapSet(); |
| OopMap* oop_map = new OopMap(frame_size_in_slots, 0); |
| |
| for (int i = 0; i < RegisterImpl::number_of_registers; i++) { |
| Register r = as_Register(i); |
| if (r < rheapbase && r != rscratch1 && r != rscratch2) { |
| int sp_offset = 2 * (i + 32); // SP offsets are in 4-byte words, |
| // register slots are 8 bytes |
| // wide, 32 floating-point |
| // registers |
| oop_map->set_callee_saved(VMRegImpl::stack2reg(sp_offset + additional_frame_slots), |
| r->as_VMReg()); |
| } |
| } |
| |
| for (int i = 0; i < FloatRegisterImpl::number_of_registers; i++) { |
| FloatRegister r = as_FloatRegister(i); |
| int sp_offset = save_vectors ? (4 * i) : (2 * i); |
| oop_map->set_callee_saved(VMRegImpl::stack2reg(sp_offset), |
| r->as_VMReg()); |
| } |
| |
| return oop_map; |
| } |
| |
| void RegisterSaver::restore_live_registers(MacroAssembler* masm, bool restore_vectors) { |
| #ifndef COMPILER2 |
| assert(!restore_vectors, "vectors are generated only by C2 and JVMCI"); |
| #endif |
| __ pop_CPU_state(restore_vectors); |
| __ leave(); |
| } |
| |
| void RegisterSaver::restore_result_registers(MacroAssembler* masm) { |
| |
| // Just restore result register. Only used by deoptimization. By |
| // now any callee save register that needs to be restored to a c2 |
| // caller of the deoptee has been extracted into the vframeArray |
| // and will be stuffed into the c2i adapter we create for later |
| // restoration so only result registers need to be restored here. |
| |
| // Restore fp result register |
| __ ldrd(v0, Address(sp, v0_offset_in_bytes())); |
| // Restore integer result register |
| __ ldr(r0, Address(sp, r0_offset_in_bytes())); |
| |
| // Pop all of the register save are off the stack |
| __ add(sp, sp, round_to(return_offset_in_bytes(), 16)); |
| } |
| |
| // Is vector's size (in bytes) bigger than a size saved by default? |
| // 8 bytes vector registers are saved by default on AArch64. |
| bool SharedRuntime::is_wide_vector(int size) { |
| return size > 8; |
| } |
| |
| size_t SharedRuntime::trampoline_size() { |
| return 16; |
| } |
| |
| void SharedRuntime::generate_trampoline(MacroAssembler *masm, address destination) { |
| __ mov(rscratch1, destination); |
| __ br(rscratch1); |
| } |
| |
| // The java_calling_convention describes stack locations as ideal slots on |
| // a frame with no abi restrictions. Since we must observe abi restrictions |
| // (like the placement of the register window) the slots must be biased by |
| // the following value. |
| static int reg2offset_in(VMReg r) { |
| // Account for saved rfp and lr |
| // This should really be in_preserve_stack_slots |
| return (r->reg2stack() + 4) * VMRegImpl::stack_slot_size; |
| } |
| |
| static int reg2offset_out(VMReg r) { |
| return (r->reg2stack() + SharedRuntime::out_preserve_stack_slots()) * VMRegImpl::stack_slot_size; |
| } |
| |
| // --------------------------------------------------------------------------- |
| // Read the array of BasicTypes from a signature, and compute where the |
| // arguments should go. Values in the VMRegPair regs array refer to 4-byte |
| // quantities. Values less than VMRegImpl::stack0 are registers, those above |
| // refer to 4-byte stack slots. All stack slots are based off of the stack pointer |
| // as framesizes are fixed. |
| // VMRegImpl::stack0 refers to the first slot 0(sp). |
| // and VMRegImpl::stack0+1 refers to the memory word 4-byes higher. Register |
| // up to RegisterImpl::number_of_registers) are the 64-bit |
| // integer registers. |
| |
| // Note: the INPUTS in sig_bt are in units of Java argument words, |
| // which are 64-bit. The OUTPUTS are in 32-bit units. |
| |
| // The Java calling convention is a "shifted" version of the C ABI. |
| // By skipping the first C ABI register we can call non-static jni |
| // methods with small numbers of arguments without having to shuffle |
| // the arguments at all. Since we control the java ABI we ought to at |
| // least get some advantage out of it. |
| |
| int SharedRuntime::java_calling_convention(const BasicType *sig_bt, |
| VMRegPair *regs, |
| int total_args_passed, |
| int is_outgoing) { |
| |
| // Create the mapping between argument positions and |
| // registers. |
| static const Register INT_ArgReg[Argument::n_int_register_parameters_j] = { |
| j_rarg0, j_rarg1, j_rarg2, j_rarg3, j_rarg4, j_rarg5, j_rarg6, j_rarg7 |
| }; |
| static const FloatRegister FP_ArgReg[Argument::n_float_register_parameters_j] = { |
| j_farg0, j_farg1, j_farg2, j_farg3, |
| j_farg4, j_farg5, j_farg6, j_farg7 |
| }; |
| |
| |
| uint int_args = 0; |
| uint fp_args = 0; |
| uint stk_args = 0; // inc by 2 each time |
| |
| for (int i = 0; i < total_args_passed; i++) { |
| switch (sig_bt[i]) { |
| case T_BOOLEAN: |
| case T_CHAR: |
| case T_BYTE: |
| case T_SHORT: |
| case T_INT: |
| if (int_args < Argument::n_int_register_parameters_j) { |
| regs[i].set1(INT_ArgReg[int_args++]->as_VMReg()); |
| } else { |
| regs[i].set1(VMRegImpl::stack2reg(stk_args)); |
| stk_args += 2; |
| } |
| break; |
| case T_VOID: |
| // halves of T_LONG or T_DOUBLE |
| assert(i != 0 && (sig_bt[i - 1] == T_LONG || sig_bt[i - 1] == T_DOUBLE), "expecting half"); |
| regs[i].set_bad(); |
| break; |
| case T_LONG: |
| assert(sig_bt[i + 1] == T_VOID, "expecting half"); |
| // fall through |
| case T_OBJECT: |
| case T_ARRAY: |
| case T_ADDRESS: |
| if (int_args < Argument::n_int_register_parameters_j) { |
| regs[i].set2(INT_ArgReg[int_args++]->as_VMReg()); |
| } else { |
| regs[i].set2(VMRegImpl::stack2reg(stk_args)); |
| stk_args += 2; |
| } |
| break; |
| case T_FLOAT: |
| if (fp_args < Argument::n_float_register_parameters_j) { |
| regs[i].set1(FP_ArgReg[fp_args++]->as_VMReg()); |
| } else { |
| regs[i].set1(VMRegImpl::stack2reg(stk_args)); |
| stk_args += 2; |
| } |
| break; |
| case T_DOUBLE: |
| assert(sig_bt[i + 1] == T_VOID, "expecting half"); |
| if (fp_args < Argument::n_float_register_parameters_j) { |
| regs[i].set2(FP_ArgReg[fp_args++]->as_VMReg()); |
| } else { |
| regs[i].set2(VMRegImpl::stack2reg(stk_args)); |
| stk_args += 2; |
| } |
| break; |
| default: |
| ShouldNotReachHere(); |
| break; |
| } |
| } |
| |
| return round_to(stk_args, 2); |
| } |
| |
| // Patch the callers callsite with entry to compiled code if it exists. |
| static void patch_callers_callsite(MacroAssembler *masm) { |
| Label L; |
| __ ldr(rscratch1, Address(rmethod, in_bytes(Method::code_offset()))); |
| __ cbz(rscratch1, L); |
| |
| __ enter(); |
| __ push_CPU_state(); |
| |
| // VM needs caller's callsite |
| // VM needs target method |
| // This needs to be a long call since we will relocate this adapter to |
| // the codeBuffer and it may not reach |
| |
| #ifndef PRODUCT |
| assert(frame::arg_reg_save_area_bytes == 0, "not expecting frame reg save area"); |
| #endif |
| |
| __ mov(c_rarg0, rmethod); |
| __ mov(c_rarg1, lr); |
| __ lea(rscratch1, RuntimeAddress(CAST_FROM_FN_PTR(address, SharedRuntime::fixup_callers_callsite))); |
| __ blrt(rscratch1, 2, 0, 0); |
| __ maybe_isb(); |
| |
| __ pop_CPU_state(); |
| // restore sp |
| __ leave(); |
| __ bind(L); |
| } |
| |
| static void gen_c2i_adapter(MacroAssembler *masm, |
| int total_args_passed, |
| int comp_args_on_stack, |
| const BasicType *sig_bt, |
| const VMRegPair *regs, |
| Label& skip_fixup) { |
| // Before we get into the guts of the C2I adapter, see if we should be here |
| // at all. We've come from compiled code and are attempting to jump to the |
| // interpreter, which means the caller made a static call to get here |
| // (vcalls always get a compiled target if there is one). Check for a |
| // compiled target. If there is one, we need to patch the caller's call. |
| patch_callers_callsite(masm); |
| |
| __ bind(skip_fixup); |
| |
| int words_pushed = 0; |
| |
| // Since all args are passed on the stack, total_args_passed * |
| // Interpreter::stackElementSize is the space we need. |
| |
| int extraspace = total_args_passed * Interpreter::stackElementSize; |
| |
| __ mov(r13, sp); |
| |
| // stack is aligned, keep it that way |
| extraspace = round_to(extraspace, 2*wordSize); |
| |
| if (extraspace) |
| __ sub(sp, sp, extraspace); |
| |
| // Now write the args into the outgoing interpreter space |
| for (int i = 0; i < total_args_passed; i++) { |
| if (sig_bt[i] == T_VOID) { |
| assert(i > 0 && (sig_bt[i-1] == T_LONG || sig_bt[i-1] == T_DOUBLE), "missing half"); |
| continue; |
| } |
| |
| // offset to start parameters |
| int st_off = (total_args_passed - i - 1) * Interpreter::stackElementSize; |
| int next_off = st_off - Interpreter::stackElementSize; |
| |
| // Say 4 args: |
| // i st_off |
| // 0 32 T_LONG |
| // 1 24 T_VOID |
| // 2 16 T_OBJECT |
| // 3 8 T_BOOL |
| // - 0 return address |
| // |
| // However to make thing extra confusing. Because we can fit a long/double in |
| // a single slot on a 64 bt vm and it would be silly to break them up, the interpreter |
| // leaves one slot empty and only stores to a single slot. In this case the |
| // slot that is occupied is the T_VOID slot. See I said it was confusing. |
| |
| VMReg r_1 = regs[i].first(); |
| VMReg r_2 = regs[i].second(); |
| if (!r_1->is_valid()) { |
| assert(!r_2->is_valid(), ""); |
| continue; |
| } |
| if (r_1->is_stack()) { |
| // memory to memory use rscratch1 |
| int ld_off = (r_1->reg2stack() * VMRegImpl::stack_slot_size |
| + extraspace |
| + words_pushed * wordSize); |
| if (!r_2->is_valid()) { |
| // sign extend?? |
| __ ldrw(rscratch1, Address(sp, ld_off)); |
| __ str(rscratch1, Address(sp, st_off)); |
| |
| } else { |
| |
| __ ldr(rscratch1, Address(sp, ld_off)); |
| |
| // Two VMREgs|OptoRegs can be T_OBJECT, T_ADDRESS, T_DOUBLE, T_LONG |
| // T_DOUBLE and T_LONG use two slots in the interpreter |
| if ( sig_bt[i] == T_LONG || sig_bt[i] == T_DOUBLE) { |
| // ld_off == LSW, ld_off+wordSize == MSW |
| // st_off == MSW, next_off == LSW |
| __ str(rscratch1, Address(sp, next_off)); |
| #ifdef ASSERT |
| // Overwrite the unused slot with known junk |
| __ mov(rscratch1, 0xdeadffffdeadaaaaul); |
| __ str(rscratch1, Address(sp, st_off)); |
| #endif /* ASSERT */ |
| } else { |
| __ str(rscratch1, Address(sp, st_off)); |
| } |
| } |
| } else if (r_1->is_Register()) { |
| Register r = r_1->as_Register(); |
| if (!r_2->is_valid()) { |
| // must be only an int (or less ) so move only 32bits to slot |
| // why not sign extend?? |
| __ str(r, Address(sp, st_off)); |
| } else { |
| // Two VMREgs|OptoRegs can be T_OBJECT, T_ADDRESS, T_DOUBLE, T_LONG |
| // T_DOUBLE and T_LONG use two slots in the interpreter |
| if ( sig_bt[i] == T_LONG || sig_bt[i] == T_DOUBLE) { |
| // long/double in gpr |
| #ifdef ASSERT |
| // Overwrite the unused slot with known junk |
| __ mov(rscratch1, 0xdeadffffdeadaaabul); |
| __ str(rscratch1, Address(sp, st_off)); |
| #endif /* ASSERT */ |
| __ str(r, Address(sp, next_off)); |
| } else { |
| __ str(r, Address(sp, st_off)); |
| } |
| } |
| } else { |
| assert(r_1->is_FloatRegister(), ""); |
| if (!r_2->is_valid()) { |
| // only a float use just part of the slot |
| __ strs(r_1->as_FloatRegister(), Address(sp, st_off)); |
| } else { |
| #ifdef ASSERT |
| // Overwrite the unused slot with known junk |
| __ mov(rscratch1, 0xdeadffffdeadaaacul); |
| __ str(rscratch1, Address(sp, st_off)); |
| #endif /* ASSERT */ |
| __ strd(r_1->as_FloatRegister(), Address(sp, next_off)); |
| } |
| } |
| } |
| |
| __ mov(esp, sp); // Interp expects args on caller's expression stack |
| |
| __ ldr(rscratch1, Address(rmethod, in_bytes(Method::interpreter_entry_offset()))); |
| __ br(rscratch1); |
| } |
| |
| |
| void SharedRuntime::gen_i2c_adapter(MacroAssembler *masm, |
| int total_args_passed, |
| int comp_args_on_stack, |
| const BasicType *sig_bt, |
| const VMRegPair *regs) { |
| |
| // Note: r13 contains the senderSP on entry. We must preserve it since |
| // we may do a i2c -> c2i transition if we lose a race where compiled |
| // code goes non-entrant while we get args ready. |
| |
| // In addition we use r13 to locate all the interpreter args because |
| // we must align the stack to 16 bytes. |
| |
| // Adapters are frameless. |
| |
| // An i2c adapter is frameless because the *caller* frame, which is |
| // interpreted, routinely repairs its own esp (from |
| // interpreter_frame_last_sp), even if a callee has modified the |
| // stack pointer. It also recalculates and aligns sp. |
| |
| // A c2i adapter is frameless because the *callee* frame, which is |
| // interpreted, routinely repairs its caller's sp (from sender_sp, |
| // which is set up via the senderSP register). |
| |
| // In other words, if *either* the caller or callee is interpreted, we can |
| // get the stack pointer repaired after a call. |
| |
| // This is why c2i and i2c adapters cannot be indefinitely composed. |
| // In particular, if a c2i adapter were to somehow call an i2c adapter, |
| // both caller and callee would be compiled methods, and neither would |
| // clean up the stack pointer changes performed by the two adapters. |
| // If this happens, control eventually transfers back to the compiled |
| // caller, but with an uncorrected stack, causing delayed havoc. |
| |
| if (VerifyAdapterCalls && |
| (Interpreter::code() != NULL || StubRoutines::code1() != NULL)) { |
| #if 0 |
| // So, let's test for cascading c2i/i2c adapters right now. |
| // assert(Interpreter::contains($return_addr) || |
| // StubRoutines::contains($return_addr), |
| // "i2c adapter must return to an interpreter frame"); |
| __ block_comment("verify_i2c { "); |
| Label L_ok; |
| if (Interpreter::code() != NULL) |
| range_check(masm, rax, r11, |
| Interpreter::code()->code_start(), Interpreter::code()->code_end(), |
| L_ok); |
| if (StubRoutines::code1() != NULL) |
| range_check(masm, rax, r11, |
| StubRoutines::code1()->code_begin(), StubRoutines::code1()->code_end(), |
| L_ok); |
| if (StubRoutines::code2() != NULL) |
| range_check(masm, rax, r11, |
| StubRoutines::code2()->code_begin(), StubRoutines::code2()->code_end(), |
| L_ok); |
| const char* msg = "i2c adapter must return to an interpreter frame"; |
| __ block_comment(msg); |
| __ stop(msg); |
| __ bind(L_ok); |
| __ block_comment("} verify_i2ce "); |
| #endif |
| } |
| |
| // Cut-out for having no stack args. |
| int comp_words_on_stack = round_to(comp_args_on_stack*VMRegImpl::stack_slot_size, wordSize)>>LogBytesPerWord; |
| if (comp_args_on_stack) { |
| __ sub(rscratch1, sp, comp_words_on_stack * wordSize); |
| __ andr(sp, rscratch1, -16); |
| } |
| |
| // Will jump to the compiled code just as if compiled code was doing it. |
| // Pre-load the register-jump target early, to schedule it better. |
| __ ldr(rscratch1, Address(rmethod, in_bytes(Method::from_compiled_offset()))); |
| |
| #if INCLUDE_JVMCI |
| if (EnableJVMCI) { |
| // check if this call should be routed towards a specific entry point |
| __ ldr(rscratch2, Address(rthread, in_bytes(JavaThread::jvmci_alternate_call_target_offset()))); |
| Label no_alternative_target; |
| __ cbz(rscratch2, no_alternative_target); |
| __ mov(rscratch1, rscratch2); |
| __ str(zr, Address(rthread, in_bytes(JavaThread::jvmci_alternate_call_target_offset()))); |
| __ bind(no_alternative_target); |
| } |
| #endif // INCLUDE_JVMCI |
| |
| // Now generate the shuffle code. |
| for (int i = 0; i < total_args_passed; i++) { |
| if (sig_bt[i] == T_VOID) { |
| assert(i > 0 && (sig_bt[i-1] == T_LONG || sig_bt[i-1] == T_DOUBLE), "missing half"); |
| continue; |
| } |
| |
| // Pick up 0, 1 or 2 words from SP+offset. |
| |
| assert(!regs[i].second()->is_valid() || regs[i].first()->next() == regs[i].second(), |
| "scrambled load targets?"); |
| // Load in argument order going down. |
| int ld_off = (total_args_passed - i - 1)*Interpreter::stackElementSize; |
| // Point to interpreter value (vs. tag) |
| int next_off = ld_off - Interpreter::stackElementSize; |
| // |
| // |
| // |
| VMReg r_1 = regs[i].first(); |
| VMReg r_2 = regs[i].second(); |
| if (!r_1->is_valid()) { |
| assert(!r_2->is_valid(), ""); |
| continue; |
| } |
| if (r_1->is_stack()) { |
| // Convert stack slot to an SP offset (+ wordSize to account for return address ) |
| int st_off = regs[i].first()->reg2stack()*VMRegImpl::stack_slot_size; |
| if (!r_2->is_valid()) { |
| // sign extend??? |
| __ ldrsw(rscratch2, Address(esp, ld_off)); |
| __ str(rscratch2, Address(sp, st_off)); |
| } else { |
| // |
| // We are using two optoregs. This can be either T_OBJECT, |
| // T_ADDRESS, T_LONG, or T_DOUBLE the interpreter allocates |
| // two slots but only uses one for thr T_LONG or T_DOUBLE case |
| // So we must adjust where to pick up the data to match the |
| // interpreter. |
| // |
| // Interpreter local[n] == MSW, local[n+1] == LSW however locals |
| // are accessed as negative so LSW is at LOW address |
| |
| // ld_off is MSW so get LSW |
| const int offset = (sig_bt[i]==T_LONG||sig_bt[i]==T_DOUBLE)? |
| next_off : ld_off; |
| __ ldr(rscratch2, Address(esp, offset)); |
| // st_off is LSW (i.e. reg.first()) |
| __ str(rscratch2, Address(sp, st_off)); |
| } |
| } else if (r_1->is_Register()) { // Register argument |
| Register r = r_1->as_Register(); |
| if (r_2->is_valid()) { |
| // |
| // We are using two VMRegs. This can be either T_OBJECT, |
| // T_ADDRESS, T_LONG, or T_DOUBLE the interpreter allocates |
| // two slots but only uses one for thr T_LONG or T_DOUBLE case |
| // So we must adjust where to pick up the data to match the |
| // interpreter. |
| |
| const int offset = (sig_bt[i]==T_LONG||sig_bt[i]==T_DOUBLE)? |
| next_off : ld_off; |
| |
| // this can be a misaligned move |
| __ ldr(r, Address(esp, offset)); |
| } else { |
| // sign extend and use a full word? |
| __ ldrw(r, Address(esp, ld_off)); |
| } |
| } else { |
| if (!r_2->is_valid()) { |
| __ ldrs(r_1->as_FloatRegister(), Address(esp, ld_off)); |
| } else { |
| __ ldrd(r_1->as_FloatRegister(), Address(esp, next_off)); |
| } |
| } |
| } |
| |
| // 6243940 We might end up in handle_wrong_method if |
| // the callee is deoptimized as we race thru here. If that |
| // happens we don't want to take a safepoint because the |
| // caller frame will look interpreted and arguments are now |
| // "compiled" so it is much better to make this transition |
| // invisible to the stack walking code. Unfortunately if |
| // we try and find the callee by normal means a safepoint |
| // is possible. So we stash the desired callee in the thread |
| // and the vm will find there should this case occur. |
| |
| __ str(rmethod, Address(rthread, JavaThread::callee_target_offset())); |
| |
| __ br(rscratch1); |
| } |
| |
| #ifdef BUILTIN_SIM |
| static void generate_i2c_adapter_name(char *result, int total_args_passed, const BasicType *sig_bt) |
| { |
| strcpy(result, "i2c("); |
| int idx = 4; |
| for (int i = 0; i < total_args_passed; i++) { |
| switch(sig_bt[i]) { |
| case T_BOOLEAN: |
| result[idx++] = 'Z'; |
| break; |
| case T_CHAR: |
| result[idx++] = 'C'; |
| break; |
| case T_FLOAT: |
| result[idx++] = 'F'; |
| break; |
| case T_DOUBLE: |
| assert((i < (total_args_passed - 1)) && (sig_bt[i+1] == T_VOID), |
| "double must be followed by void"); |
| i++; |
| result[idx++] = 'D'; |
| break; |
| case T_BYTE: |
| result[idx++] = 'B'; |
| break; |
| case T_SHORT: |
| result[idx++] = 'S'; |
| break; |
| case T_INT: |
| result[idx++] = 'I'; |
| break; |
| case T_LONG: |
| assert((i < (total_args_passed - 1)) && (sig_bt[i+1] == T_VOID), |
| "long must be followed by void"); |
| i++; |
| result[idx++] = 'L'; |
| break; |
| case T_OBJECT: |
| result[idx++] = 'O'; |
| break; |
| case T_ARRAY: |
| result[idx++] = '['; |
| break; |
| case T_ADDRESS: |
| result[idx++] = 'P'; |
| break; |
| case T_NARROWOOP: |
| result[idx++] = 'N'; |
| break; |
| case T_METADATA: |
| result[idx++] = 'M'; |
| break; |
| case T_NARROWKLASS: |
| result[idx++] = 'K'; |
| break; |
| default: |
| result[idx++] = '?'; |
| break; |
| } |
| } |
| result[idx++] = ')'; |
| result[idx] = '\0'; |
| } |
| #endif |
| |
| // --------------------------------------------------------------- |
| AdapterHandlerEntry* SharedRuntime::generate_i2c2i_adapters(MacroAssembler *masm, |
| int total_args_passed, |
| int comp_args_on_stack, |
| const BasicType *sig_bt, |
| const VMRegPair *regs, |
| AdapterFingerPrint* fingerprint) { |
| address i2c_entry = __ pc(); |
| #ifdef BUILTIN_SIM |
| char *name = NULL; |
| AArch64Simulator *sim = NULL; |
| size_t len = 65536; |
| if (NotifySimulator) { |
| name = NEW_C_HEAP_ARRAY(char, len, mtInternal); |
| } |
| |
| if (name) { |
| generate_i2c_adapter_name(name, total_args_passed, sig_bt); |
| sim = AArch64Simulator::get_current(UseSimulatorCache, DisableBCCheck); |
| sim->notifyCompile(name, i2c_entry); |
| } |
| #endif |
| gen_i2c_adapter(masm, total_args_passed, comp_args_on_stack, sig_bt, regs); |
| |
| address c2i_unverified_entry = __ pc(); |
| Label skip_fixup; |
| |
| Label ok; |
| |
| Register holder = rscratch2; |
| Register receiver = j_rarg0; |
| Register tmp = r10; // A call-clobbered register not used for arg passing |
| |
| // ------------------------------------------------------------------------- |
| // Generate a C2I adapter. On entry we know rmethod holds the Method* during calls |
| // to the interpreter. The args start out packed in the compiled layout. They |
| // need to be unpacked into the interpreter layout. This will almost always |
| // require some stack space. We grow the current (compiled) stack, then repack |
| // the args. We finally end in a jump to the generic interpreter entry point. |
| // On exit from the interpreter, the interpreter will restore our SP (lest the |
| // compiled code, which relys solely on SP and not FP, get sick). |
| |
| { |
| __ block_comment("c2i_unverified_entry {"); |
| __ load_klass(rscratch1, receiver); |
| __ ldr(tmp, Address(holder, CompiledICHolder::holder_klass_offset())); |
| __ cmp(rscratch1, tmp); |
| __ ldr(rmethod, Address(holder, CompiledICHolder::holder_method_offset())); |
| __ br(Assembler::EQ, ok); |
| __ far_jump(RuntimeAddress(SharedRuntime::get_ic_miss_stub())); |
| |
| __ bind(ok); |
| // Method might have been compiled since the call site was patched to |
| // interpreted; if that is the case treat it as a miss so we can get |
| // the call site corrected. |
| __ ldr(rscratch1, Address(rmethod, in_bytes(Method::code_offset()))); |
| __ cbz(rscratch1, skip_fixup); |
| __ far_jump(RuntimeAddress(SharedRuntime::get_ic_miss_stub())); |
| __ block_comment("} c2i_unverified_entry"); |
| } |
| |
| address c2i_entry = __ pc(); |
| |
| #ifdef BUILTIN_SIM |
| if (name) { |
| name[0] = 'c'; |
| name[2] = 'i'; |
| sim->notifyCompile(name, c2i_entry); |
| FREE_C_HEAP_ARRAY(char, name, mtInternal); |
| } |
| #endif |
| |
| gen_c2i_adapter(masm, total_args_passed, comp_args_on_stack, sig_bt, regs, skip_fixup); |
| |
| __ flush(); |
| return AdapterHandlerLibrary::new_entry(fingerprint, i2c_entry, c2i_entry, c2i_unverified_entry); |
| } |
| |
| int SharedRuntime::c_calling_convention(const BasicType *sig_bt, |
| VMRegPair *regs, |
| VMRegPair *regs2, |
| int total_args_passed) { |
| assert(regs2 == NULL, "not needed on AArch64"); |
| |
| // We return the amount of VMRegImpl stack slots we need to reserve for all |
| // the arguments NOT counting out_preserve_stack_slots. |
| |
| static const Register INT_ArgReg[Argument::n_int_register_parameters_c] = { |
| c_rarg0, c_rarg1, c_rarg2, c_rarg3, c_rarg4, c_rarg5, c_rarg6, c_rarg7 |
| }; |
| static const FloatRegister FP_ArgReg[Argument::n_float_register_parameters_c] = { |
| c_farg0, c_farg1, c_farg2, c_farg3, |
| c_farg4, c_farg5, c_farg6, c_farg7 |
| }; |
| |
| uint int_args = 0; |
| uint fp_args = 0; |
| uint stk_args = 0; // inc by 2 each time |
| |
| for (int i = 0; i < total_args_passed; i++) { |
| switch (sig_bt[i]) { |
| case T_BOOLEAN: |
| case T_CHAR: |
| case T_BYTE: |
| case T_SHORT: |
| case T_INT: |
| if (int_args < Argument::n_int_register_parameters_c) { |
| regs[i].set1(INT_ArgReg[int_args++]->as_VMReg()); |
| } else { |
| regs[i].set1(VMRegImpl::stack2reg(stk_args)); |
| stk_args += 2; |
| } |
| break; |
| case T_LONG: |
| assert(sig_bt[i + 1] == T_VOID, "expecting half"); |
| // fall through |
| case T_OBJECT: |
| case T_ARRAY: |
| case T_ADDRESS: |
| case T_METADATA: |
| if (int_args < Argument::n_int_register_parameters_c) { |
| regs[i].set2(INT_ArgReg[int_args++]->as_VMReg()); |
| } else { |
| regs[i].set2(VMRegImpl::stack2reg(stk_args)); |
| stk_args += 2; |
| } |
| break; |
| case T_FLOAT: |
| if (fp_args < Argument::n_float_register_parameters_c) { |
| regs[i].set1(FP_ArgReg[fp_args++]->as_VMReg()); |
| } else { |
| regs[i].set1(VMRegImpl::stack2reg(stk_args)); |
| stk_args += 2; |
| } |
| break; |
| case T_DOUBLE: |
| assert(sig_bt[i + 1] == T_VOID, "expecting half"); |
| if (fp_args < Argument::n_float_register_parameters_c) { |
| regs[i].set2(FP_ArgReg[fp_args++]->as_VMReg()); |
| } else { |
| regs[i].set2(VMRegImpl::stack2reg(stk_args)); |
| stk_args += 2; |
| } |
| break; |
| case T_VOID: // Halves of longs and doubles |
| assert(i != 0 && (sig_bt[i - 1] == T_LONG || sig_bt[i - 1] == T_DOUBLE), "expecting half"); |
| regs[i].set_bad(); |
| break; |
| default: |
| ShouldNotReachHere(); |
| break; |
| } |
| } |
| |
| return stk_args; |
| } |
| |
| // On 64 bit we will store integer like items to the stack as |
| // 64 bits items (sparc abi) even though java would only store |
| // 32bits for a parameter. On 32bit it will simply be 32 bits |
| // So this routine will do 32->32 on 32bit and 32->64 on 64bit |
| static void move32_64(MacroAssembler* masm, VMRegPair src, VMRegPair dst) { |
| if (src.first()->is_stack()) { |
| if (dst.first()->is_stack()) { |
| // stack to stack |
| __ ldr(rscratch1, Address(rfp, reg2offset_in(src.first()))); |
| __ str(rscratch1, Address(sp, reg2offset_out(dst.first()))); |
| } else { |
| // stack to reg |
| __ ldrsw(dst.first()->as_Register(), Address(rfp, reg2offset_in(src.first()))); |
| } |
| } else if (dst.first()->is_stack()) { |
| // reg to stack |
| // Do we really have to sign extend??? |
| // __ movslq(src.first()->as_Register(), src.first()->as_Register()); |
| __ str(src.first()->as_Register(), Address(sp, reg2offset_out(dst.first()))); |
| } else { |
| if (dst.first() != src.first()) { |
| __ sxtw(dst.first()->as_Register(), src.first()->as_Register()); |
| } |
| } |
| } |
| |
| // An oop arg. Must pass a handle not the oop itself |
| static void object_move(MacroAssembler* masm, |
| OopMap* map, |
| int oop_handle_offset, |
| int framesize_in_slots, |
| VMRegPair src, |
| VMRegPair dst, |
| bool is_receiver, |
| int* receiver_offset) { |
| |
| // must pass a handle. First figure out the location we use as a handle |
| |
| Register rHandle = dst.first()->is_stack() ? rscratch2 : dst.first()->as_Register(); |
| |
| // See if oop is NULL if it is we need no handle |
| |
| if (src.first()->is_stack()) { |
| |
| // Oop is already on the stack as an argument |
| int offset_in_older_frame = src.first()->reg2stack() + SharedRuntime::out_preserve_stack_slots(); |
| map->set_oop(VMRegImpl::stack2reg(offset_in_older_frame + framesize_in_slots)); |
| if (is_receiver) { |
| *receiver_offset = (offset_in_older_frame + framesize_in_slots) * VMRegImpl::stack_slot_size; |
| } |
| |
| __ ldr(rscratch1, Address(rfp, reg2offset_in(src.first()))); |
| __ lea(rHandle, Address(rfp, reg2offset_in(src.first()))); |
| // conditionally move a NULL |
| __ cmp(rscratch1, zr); |
| __ csel(rHandle, zr, rHandle, Assembler::EQ); |
| } else { |
| |
| // Oop is in an a register we must store it to the space we reserve |
| // on the stack for oop_handles and pass a handle if oop is non-NULL |
| |
| const Register rOop = src.first()->as_Register(); |
| int oop_slot; |
| if (rOop == j_rarg0) |
| oop_slot = 0; |
| else if (rOop == j_rarg1) |
| oop_slot = 1; |
| else if (rOop == j_rarg2) |
| oop_slot = 2; |
| else if (rOop == j_rarg3) |
| oop_slot = 3; |
| else if (rOop == j_rarg4) |
| oop_slot = 4; |
| else if (rOop == j_rarg5) |
| oop_slot = 5; |
| else if (rOop == j_rarg6) |
| oop_slot = 6; |
| else { |
| assert(rOop == j_rarg7, "wrong register"); |
| oop_slot = 7; |
| } |
| |
| oop_slot = oop_slot * VMRegImpl::slots_per_word + oop_handle_offset; |
| int offset = oop_slot*VMRegImpl::stack_slot_size; |
| |
| map->set_oop(VMRegImpl::stack2reg(oop_slot)); |
| // Store oop in handle area, may be NULL |
| __ str(rOop, Address(sp, offset)); |
| if (is_receiver) { |
| *receiver_offset = offset; |
| } |
| |
| __ cmp(rOop, zr); |
| __ lea(rHandle, Address(sp, offset)); |
| // conditionally move a NULL |
| __ csel(rHandle, zr, rHandle, Assembler::EQ); |
| } |
| |
| // If arg is on the stack then place it otherwise it is already in correct reg. |
| if (dst.first()->is_stack()) { |
| __ str(rHandle, Address(sp, reg2offset_out(dst.first()))); |
| } |
| } |
| |
| // A float arg may have to do float reg int reg conversion |
| static void float_move(MacroAssembler* masm, VMRegPair src, VMRegPair dst) { |
| if (src.first() != dst.first()) { |
| if (src.is_single_phys_reg() && dst.is_single_phys_reg()) |
| __ fmovs(dst.first()->as_FloatRegister(), src.first()->as_FloatRegister()); |
| else |
| ShouldNotReachHere(); |
| } |
| } |
| |
| // A long move |
| static void long_move(MacroAssembler* masm, VMRegPair src, VMRegPair dst) { |
| if (src.first()->is_stack()) { |
| if (dst.first()->is_stack()) { |
| // stack to stack |
| __ ldr(rscratch1, Address(rfp, reg2offset_in(src.first()))); |
| __ str(rscratch1, Address(sp, reg2offset_out(dst.first()))); |
| } else { |
| // stack to reg |
| __ ldr(dst.first()->as_Register(), Address(rfp, reg2offset_in(src.first()))); |
| } |
| } else if (dst.first()->is_stack()) { |
| // reg to stack |
| // Do we really have to sign extend??? |
| // __ movslq(src.first()->as_Register(), src.first()->as_Register()); |
| __ str(src.first()->as_Register(), Address(sp, reg2offset_out(dst.first()))); |
| } else { |
| if (dst.first() != src.first()) { |
| __ mov(dst.first()->as_Register(), src.first()->as_Register()); |
| } |
| } |
| } |
| |
| |
| // A double move |
| static void double_move(MacroAssembler* masm, VMRegPair src, VMRegPair dst) { |
| if (src.first() != dst.first()) { |
| if (src.is_single_phys_reg() && dst.is_single_phys_reg()) |
| __ fmovd(dst.first()->as_FloatRegister(), src.first()->as_FloatRegister()); |
| else |
| ShouldNotReachHere(); |
| } |
| } |
| |
| |
| void SharedRuntime::save_native_result(MacroAssembler *masm, BasicType ret_type, int frame_slots) { |
| // We always ignore the frame_slots arg and just use the space just below frame pointer |
| // which by this time is free to use |
| switch (ret_type) { |
| case T_FLOAT: |
| __ strs(v0, Address(rfp, -wordSize)); |
| break; |
| case T_DOUBLE: |
| __ strd(v0, Address(rfp, -wordSize)); |
| break; |
| case T_VOID: break; |
| default: { |
| __ str(r0, Address(rfp, -wordSize)); |
| } |
| } |
| } |
| |
| void SharedRuntime::restore_native_result(MacroAssembler *masm, BasicType ret_type, int frame_slots) { |
| // We always ignore the frame_slots arg and just use the space just below frame pointer |
| // which by this time is free to use |
| switch (ret_type) { |
| case T_FLOAT: |
| __ ldrs(v0, Address(rfp, -wordSize)); |
| break; |
| case T_DOUBLE: |
| __ ldrd(v0, Address(rfp, -wordSize)); |
| break; |
| case T_VOID: break; |
| default: { |
| __ ldr(r0, Address(rfp, -wordSize)); |
| } |
| } |
| } |
| static void save_args(MacroAssembler *masm, int arg_count, int first_arg, VMRegPair *args) { |
| RegSet x; |
| for ( int i = first_arg ; i < arg_count ; i++ ) { |
| if (args[i].first()->is_Register()) { |
| x = x + args[i].first()->as_Register(); |
| } else if (args[i].first()->is_FloatRegister()) { |
| __ strd(args[i].first()->as_FloatRegister(), Address(__ pre(sp, -2 * wordSize))); |
| } |
| } |
| __ push(x, sp); |
| } |
| |
| static void restore_args(MacroAssembler *masm, int arg_count, int first_arg, VMRegPair *args) { |
| RegSet x; |
| for ( int i = first_arg ; i < arg_count ; i++ ) { |
| if (args[i].first()->is_Register()) { |
| x = x + args[i].first()->as_Register(); |
| } else { |
| ; |
| } |
| } |
| __ pop(x, sp); |
| for ( int i = first_arg ; i < arg_count ; i++ ) { |
| if (args[i].first()->is_Register()) { |
| ; |
| } else if (args[i].first()->is_FloatRegister()) { |
| __ ldrd(args[i].first()->as_FloatRegister(), Address(__ post(sp, 2 * wordSize))); |
| } |
| } |
| } |
| |
| |
| // Check GCLocker::needs_gc and enter the runtime if it's true. This |
| // keeps a new JNI critical region from starting until a GC has been |
| // forced. Save down any oops in registers and describe them in an |
| // OopMap. |
| static void check_needs_gc_for_critical_native(MacroAssembler* masm, |
| int stack_slots, |
| int total_c_args, |
| int total_in_args, |
| int arg_save_area, |
| OopMapSet* oop_maps, |
| VMRegPair* in_regs, |
| BasicType* in_sig_bt) { Unimplemented(); } |
| |
| // Unpack an array argument into a pointer to the body and the length |
| // if the array is non-null, otherwise pass 0 for both. |
| static void unpack_array_argument(MacroAssembler* masm, VMRegPair reg, BasicType in_elem_type, VMRegPair body_arg, VMRegPair length_arg) { Unimplemented(); } |
| |
| |
| class ComputeMoveOrder: public StackObj { |
| class MoveOperation: public ResourceObj { |
| friend class ComputeMoveOrder; |
| private: |
| VMRegPair _src; |
| VMRegPair _dst; |
| int _src_index; |
| int _dst_index; |
| bool _processed; |
| MoveOperation* _next; |
| MoveOperation* _prev; |
| |
| static int get_id(VMRegPair r) { Unimplemented(); return 0; } |
| |
| public: |
| MoveOperation(int src_index, VMRegPair src, int dst_index, VMRegPair dst): |
| _src(src) |
| , _src_index(src_index) |
| , _dst(dst) |
| , _dst_index(dst_index) |
| , _next(NULL) |
| , _prev(NULL) |
| , _processed(false) { Unimplemented(); } |
| |
| VMRegPair src() const { Unimplemented(); return _src; } |
| int src_id() const { Unimplemented(); return 0; } |
| int src_index() const { Unimplemented(); return 0; } |
| VMRegPair dst() const { Unimplemented(); return _src; } |
| void set_dst(int i, VMRegPair dst) { Unimplemented(); } |
| int dst_index() const { Unimplemented(); return 0; } |
| int dst_id() const { Unimplemented(); return 0; } |
| MoveOperation* next() const { Unimplemented(); return 0; } |
| MoveOperation* prev() const { Unimplemented(); return 0; } |
| void set_processed() { Unimplemented(); } |
| bool is_processed() const { Unimplemented(); return 0; } |
| |
| // insert |
| void break_cycle(VMRegPair temp_register) { Unimplemented(); } |
| |
| void link(GrowableArray<MoveOperation*>& killer) { Unimplemented(); } |
| }; |
| |
| private: |
| GrowableArray<MoveOperation*> edges; |
| |
| public: |
| ComputeMoveOrder(int total_in_args, VMRegPair* in_regs, int total_c_args, VMRegPair* out_regs, |
| BasicType* in_sig_bt, GrowableArray<int>& arg_order, VMRegPair tmp_vmreg) { Unimplemented(); } |
| |
| // Collected all the move operations |
| void add_edge(int src_index, VMRegPair src, int dst_index, VMRegPair dst) { Unimplemented(); } |
| |
| // Walk the edges breaking cycles between moves. The result list |
| // can be walked in order to produce the proper set of loads |
| GrowableArray<MoveOperation*>* get_store_order(VMRegPair temp_register) { Unimplemented(); return 0; } |
| }; |
| |
| |
| static void rt_call(MacroAssembler* masm, address dest, int gpargs, int fpargs, int type) { |
| CodeBlob *cb = CodeCache::find_blob(dest); |
| if (cb) { |
| __ far_call(RuntimeAddress(dest)); |
| } else { |
| assert((unsigned)gpargs < 256, "eek!"); |
| assert((unsigned)fpargs < 32, "eek!"); |
| __ lea(rscratch1, RuntimeAddress(dest)); |
| if (UseBuiltinSim) __ mov(rscratch2, (gpargs << 6) | (fpargs << 2) | type); |
| __ blrt(rscratch1, rscratch2); |
| __ maybe_isb(); |
| } |
| } |
| |
| static void verify_oop_args(MacroAssembler* masm, |
| methodHandle method, |
| const BasicType* sig_bt, |
| const VMRegPair* regs) { |
| Register temp_reg = r19; // not part of any compiled calling seq |
| if (VerifyOops) { |
| for (int i = 0; i < method->size_of_parameters(); i++) { |
| if (sig_bt[i] == T_OBJECT || |
| sig_bt[i] == T_ARRAY) { |
| VMReg r = regs[i].first(); |
| assert(r->is_valid(), "bad oop arg"); |
| if (r->is_stack()) { |
| __ ldr(temp_reg, Address(sp, r->reg2stack() * VMRegImpl::stack_slot_size)); |
| __ verify_oop(temp_reg); |
| } else { |
| __ verify_oop(r->as_Register()); |
| } |
| } |
| } |
| } |
| } |
| |
| static void gen_special_dispatch(MacroAssembler* masm, |
| methodHandle method, |
| const BasicType* sig_bt, |
| const VMRegPair* regs) { |
| verify_oop_args(masm, method, sig_bt, regs); |
| vmIntrinsics::ID iid = method->intrinsic_id(); |
| |
| // Now write the args into the outgoing interpreter space |
| bool has_receiver = false; |
| Register receiver_reg = noreg; |
| int member_arg_pos = -1; |
| Register member_reg = noreg; |
| int ref_kind = MethodHandles::signature_polymorphic_intrinsic_ref_kind(iid); |
| if (ref_kind != 0) { |
| member_arg_pos = method->size_of_parameters() - 1; // trailing MemberName argument |
| member_reg = r19; // known to be free at this point |
| has_receiver = MethodHandles::ref_kind_has_receiver(ref_kind); |
| } else if (iid == vmIntrinsics::_invokeBasic) { |
| has_receiver = true; |
| } else { |
| fatal("unexpected intrinsic id %d", iid); |
| } |
| |
| if (member_reg != noreg) { |
| // Load the member_arg into register, if necessary. |
| SharedRuntime::check_member_name_argument_is_last_argument(method, sig_bt, regs); |
| VMReg r = regs[member_arg_pos].first(); |
| if (r->is_stack()) { |
| __ ldr(member_reg, Address(sp, r->reg2stack() * VMRegImpl::stack_slot_size)); |
| } else { |
| // no data motion is needed |
| member_reg = r->as_Register(); |
| } |
| } |
| |
| if (has_receiver) { |
| // Make sure the receiver is loaded into a register. |
| assert(method->size_of_parameters() > 0, "oob"); |
| assert(sig_bt[0] == T_OBJECT, "receiver argument must be an object"); |
| VMReg r = regs[0].first(); |
| assert(r->is_valid(), "bad receiver arg"); |
| if (r->is_stack()) { |
| // Porting note: This assumes that compiled calling conventions always |
| // pass the receiver oop in a register. If this is not true on some |
| // platform, pick a temp and load the receiver from stack. |
| fatal("receiver always in a register"); |
| receiver_reg = r2; // known to be free at this point |
| __ ldr(receiver_reg, Address(sp, r->reg2stack() * VMRegImpl::stack_slot_size)); |
| } else { |
| // no data motion is needed |
| receiver_reg = r->as_Register(); |
| } |
| } |
| |
| // Figure out which address we are really jumping to: |
| MethodHandles::generate_method_handle_dispatch(masm, iid, |
| receiver_reg, member_reg, /*for_compiler_entry:*/ true); |
| } |
| |
| // --------------------------------------------------------------------------- |
| // Generate a native wrapper for a given method. The method takes arguments |
| // in the Java compiled code convention, marshals them to the native |
| // convention (handlizes oops, etc), transitions to native, makes the call, |
| // returns to java state (possibly blocking), unhandlizes any result and |
| // returns. |
| // |
| // Critical native functions are a shorthand for the use of |
| // GetPrimtiveArrayCritical and disallow the use of any other JNI |
| // functions. The wrapper is expected to unpack the arguments before |
| // passing them to the callee and perform checks before and after the |
| // native call to ensure that they GCLocker |
| // lock_critical/unlock_critical semantics are followed. Some other |
| // parts of JNI setup are skipped like the tear down of the JNI handle |
| // block and the check for pending exceptions it's impossible for them |
| // to be thrown. |
| // |
| // They are roughly structured like this: |
| // if (GCLocker::needs_gc()) |
| // SharedRuntime::block_for_jni_critical(); |
| // tranistion to thread_in_native |
| // unpack arrray arguments and call native entry point |
| // check for safepoint in progress |
| // check if any thread suspend flags are set |
| // call into JVM and possible unlock the JNI critical |
| // if a GC was suppressed while in the critical native. |
| // transition back to thread_in_Java |
| // return to caller |
| // |
| nmethod* SharedRuntime::generate_native_wrapper(MacroAssembler* masm, |
| const methodHandle& method, |
| int compile_id, |
| BasicType* in_sig_bt, |
| VMRegPair* in_regs, |
| BasicType ret_type) { |
| #ifdef BUILTIN_SIM |
| if (NotifySimulator) { |
| // Names are up to 65536 chars long. UTF8-coded strings are up to |
| // 3 bytes per character. We concatenate three such strings. |
| // Yes, I know this is ridiculous, but it's debug code and glibc |
| // allocates large arrays very efficiently. |
| size_t len = (65536 * 3) * 3; |
| char *name = new char[len]; |
| |
| strncpy(name, method()->method_holder()->name()->as_utf8(), len); |
| strncat(name, ".", len); |
| strncat(name, method()->name()->as_utf8(), len); |
| strncat(name, method()->signature()->as_utf8(), len); |
| AArch64Simulator::get_current(UseSimulatorCache, DisableBCCheck)->notifyCompile(name, __ pc()); |
| delete[] name; |
| } |
| #endif |
| |
| if (method->is_method_handle_intrinsic()) { |
| vmIntrinsics::ID iid = method->intrinsic_id(); |
| intptr_t start = (intptr_t)__ pc(); |
| int vep_offset = ((intptr_t)__ pc()) - start; |
| |
| // First instruction must be a nop as it may need to be patched on deoptimisation |
| __ nop(); |
| gen_special_dispatch(masm, |
| method, |
| in_sig_bt, |
| in_regs); |
| int frame_complete = ((intptr_t)__ pc()) - start; // not complete, period |
| __ flush(); |
| int stack_slots = SharedRuntime::out_preserve_stack_slots(); // no out slots at all, actually |
| return nmethod::new_native_nmethod(method, |
| compile_id, |
| masm->code(), |
| vep_offset, |
| frame_complete, |
| stack_slots / VMRegImpl::slots_per_word, |
| in_ByteSize(-1), |
| in_ByteSize(-1), |
| (OopMapSet*)NULL); |
| } |
| bool is_critical_native = true; |
| address native_func = method->critical_native_function(); |
| if (native_func == NULL) { |
| native_func = method->native_function(); |
| is_critical_native = false; |
| } |
| assert(native_func != NULL, "must have function"); |
| |
| // An OopMap for lock (and class if static) |
| OopMapSet *oop_maps = new OopMapSet(); |
| intptr_t start = (intptr_t)__ pc(); |
| |
| // We have received a description of where all the java arg are located |
| // on entry to the wrapper. We need to convert these args to where |
| // the jni function will expect them. To figure out where they go |
| // we convert the java signature to a C signature by inserting |
| // the hidden arguments as arg[0] and possibly arg[1] (static method) |
| |
| const int total_in_args = method->size_of_parameters(); |
| int total_c_args = total_in_args; |
| if (!is_critical_native) { |
| total_c_args += 1; |
| if (method->is_static()) { |
| total_c_args++; |
| } |
| } else { |
| for (int i = 0; i < total_in_args; i++) { |
| if (in_sig_bt[i] == T_ARRAY) { |
| total_c_args++; |
| } |
| } |
| } |
| |
| BasicType* out_sig_bt = NEW_RESOURCE_ARRAY(BasicType, total_c_args); |
| VMRegPair* out_regs = NEW_RESOURCE_ARRAY(VMRegPair, total_c_args); |
| BasicType* in_elem_bt = NULL; |
| |
| int argc = 0; |
| if (!is_critical_native) { |
| out_sig_bt[argc++] = T_ADDRESS; |
| if (method->is_static()) { |
| out_sig_bt[argc++] = T_OBJECT; |
| } |
| |
| for (int i = 0; i < total_in_args ; i++ ) { |
| out_sig_bt[argc++] = in_sig_bt[i]; |
| } |
| } else { |
| Thread* THREAD = Thread::current(); |
| in_elem_bt = NEW_RESOURCE_ARRAY(BasicType, total_in_args); |
| SignatureStream ss(method->signature()); |
| for (int i = 0; i < total_in_args ; i++ ) { |
| if (in_sig_bt[i] == T_ARRAY) { |
| // Arrays are passed as int, elem* pair |
| out_sig_bt[argc++] = T_INT; |
| out_sig_bt[argc++] = T_ADDRESS; |
| Symbol* atype = ss.as_symbol(CHECK_NULL); |
| const char* at = atype->as_C_string(); |
| if (strlen(at) == 2) { |
| assert(at[0] == '[', "must be"); |
| switch (at[1]) { |
| case 'B': in_elem_bt[i] = T_BYTE; break; |
| case 'C': in_elem_bt[i] = T_CHAR; break; |
| case 'D': in_elem_bt[i] = T_DOUBLE; break; |
| case 'F': in_elem_bt[i] = T_FLOAT; break; |
| case 'I': in_elem_bt[i] = T_INT; break; |
| case 'J': in_elem_bt[i] = T_LONG; break; |
| case 'S': in_elem_bt[i] = T_SHORT; break; |
| case 'Z': in_elem_bt[i] = T_BOOLEAN; break; |
| default: ShouldNotReachHere(); |
| } |
| } |
| } else { |
| out_sig_bt[argc++] = in_sig_bt[i]; |
| in_elem_bt[i] = T_VOID; |
| } |
| if (in_sig_bt[i] != T_VOID) { |
| assert(in_sig_bt[i] == ss.type(), "must match"); |
| ss.next(); |
| } |
| } |
| } |
| |
| // Now figure out where the args must be stored and how much stack space |
| // they require. |
| int out_arg_slots; |
| out_arg_slots = c_calling_convention(out_sig_bt, out_regs, NULL, total_c_args); |
| |
| // Compute framesize for the wrapper. We need to handlize all oops in |
| // incoming registers |
| |
| // Calculate the total number of stack slots we will need. |
| |
| // First count the abi requirement plus all of the outgoing args |
| int stack_slots = SharedRuntime::out_preserve_stack_slots() + out_arg_slots; |
| |
| // Now the space for the inbound oop handle area |
| int total_save_slots = 8 * VMRegImpl::slots_per_word; // 8 arguments passed in registers |
| if (is_critical_native) { |
| // Critical natives may have to call out so they need a save area |
| // for register arguments. |
| int double_slots = 0; |
| int single_slots = 0; |
| for ( int i = 0; i < total_in_args; i++) { |
| if (in_regs[i].first()->is_Register()) { |
| const Register reg = in_regs[i].first()->as_Register(); |
| switch (in_sig_bt[i]) { |
| case T_BOOLEAN: |
| case T_BYTE: |
| case T_SHORT: |
| case T_CHAR: |
| case T_INT: single_slots++; break; |
| case T_ARRAY: // specific to LP64 (7145024) |
| case T_LONG: double_slots++; break; |
| default: ShouldNotReachHere(); |
| } |
| } else if (in_regs[i].first()->is_FloatRegister()) { |
| ShouldNotReachHere(); |
| } |
| } |
| total_save_slots = double_slots * 2 + single_slots; |
| // align the save area |
| if (double_slots != 0) { |
| stack_slots = round_to(stack_slots, 2); |
| } |
| } |
| |
| int oop_handle_offset = stack_slots; |
| stack_slots += total_save_slots; |
| |
| // Now any space we need for handlizing a klass if static method |
| |
| int klass_slot_offset = 0; |
| int klass_offset = -1; |
| int lock_slot_offset = 0; |
| bool is_static = false; |
| |
| if (method->is_static()) { |
| klass_slot_offset = stack_slots; |
| stack_slots += VMRegImpl::slots_per_word; |
| klass_offset = klass_slot_offset * VMRegImpl::stack_slot_size; |
| is_static = true; |
| } |
| |
| // Plus a lock if needed |
| |
| if (method->is_synchronized()) { |
| lock_slot_offset = stack_slots; |
| stack_slots += VMRegImpl::slots_per_word; |
| } |
| |
| // Now a place (+2) to save return values or temp during shuffling |
| // + 4 for return address (which we own) and saved rfp |
| stack_slots += 6; |
| |
| // Ok The space we have allocated will look like: |
| // |
| // |
| // FP-> | | |
| // |---------------------| |
| // | 2 slots for moves | |
| // |---------------------| |
| // | lock box (if sync) | |
| // |---------------------| <- lock_slot_offset |
| // | klass (if static) | |
| // |---------------------| <- klass_slot_offset |
| // | oopHandle area | |
| // |---------------------| <- oop_handle_offset (8 java arg registers) |
| // | outbound memory | |
| // | based arguments | |
| // | | |
| // |---------------------| |
| // | | |
| // SP-> | out_preserved_slots | |
| // |
| // |
| |
| |
| // Now compute actual number of stack words we need rounding to make |
| // stack properly aligned. |
| stack_slots = round_to(stack_slots, StackAlignmentInSlots); |
| |
| int stack_size = stack_slots * VMRegImpl::stack_slot_size; |
| |
| // First thing make an ic check to see if we should even be here |
| |
| // We are free to use all registers as temps without saving them and |
| // restoring them except rfp. rfp is the only callee save register |
| // as far as the interpreter and the compiler(s) are concerned. |
| |
| |
| const Register ic_reg = rscratch2; |
| const Register receiver = j_rarg0; |
| |
| Label hit; |
| Label exception_pending; |
| |
| assert_different_registers(ic_reg, receiver, rscratch1); |
| __ verify_oop(receiver); |
| __ cmp_klass(receiver, ic_reg, rscratch1); |
| __ br(Assembler::EQ, hit); |
| |
| __ far_jump(RuntimeAddress(SharedRuntime::get_ic_miss_stub())); |
| |
| // Verified entry point must be aligned |
| __ align(8); |
| |
| __ bind(hit); |
| |
| int vep_offset = ((intptr_t)__ pc()) - start; |
| |
| // If we have to make this method not-entrant we'll overwrite its |
| // first instruction with a jump. For this action to be legal we |
| // must ensure that this first instruction is a B, BL, NOP, BKPT, |
| // SVC, HVC, or SMC. Make it a NOP. |
| __ nop(); |
| |
| // Generate stack overflow check |
| if (UseStackBanging) { |
| __ bang_stack_with_offset(JavaThread::stack_shadow_zone_size()); |
| } else { |
| Unimplemented(); |
| } |
| |
| // Generate a new frame for the wrapper. |
| __ enter(); |
| // -2 because return address is already present and so is saved rfp |
| __ sub(sp, sp, stack_size - 2*wordSize); |
| |
| // Frame is now completed as far as size and linkage. |
| int frame_complete = ((intptr_t)__ pc()) - start; |
| |
| // record entry into native wrapper code |
| if (NotifySimulator) { |
| __ notify(Assembler::method_entry); |
| } |
| |
| // We use r20 as the oop handle for the receiver/klass |
| // It is callee save so it survives the call to native |
| |
| const Register oop_handle_reg = r20; |
| |
| if (is_critical_native) { |
| check_needs_gc_for_critical_native(masm, stack_slots, total_c_args, total_in_args, |
| oop_handle_offset, oop_maps, in_regs, in_sig_bt); |
| } |
| |
| // |
| // We immediately shuffle the arguments so that any vm call we have to |
| // make from here on out (sync slow path, jvmti, etc.) we will have |
| // captured the oops from our caller and have a valid oopMap for |
| // them. |
| |
| // ----------------- |
| // The Grand Shuffle |
| |
| // The Java calling convention is either equal (linux) or denser (win64) than the |
| // c calling convention. However the because of the jni_env argument the c calling |
| // convention always has at least one more (and two for static) arguments than Java. |
| // Therefore if we move the args from java -> c backwards then we will never have |
| // a register->register conflict and we don't have to build a dependency graph |
| // and figure out how to break any cycles. |
| // |
| |
| // Record esp-based slot for receiver on stack for non-static methods |
| int receiver_offset = -1; |
| |
| // This is a trick. We double the stack slots so we can claim |
| // the oops in the caller's frame. Since we are sure to have |
| // more args than the caller doubling is enough to make |
| // sure we can capture all the incoming oop args from the |
| // caller. |
| // |
| OopMap* map = new OopMap(stack_slots * 2, 0 /* arg_slots*/); |
| |
| // Mark location of rfp (someday) |
| // map->set_callee_saved(VMRegImpl::stack2reg( stack_slots - 2), stack_slots * 2, 0, vmreg(rfp)); |
| |
| |
| int float_args = 0; |
| int int_args = 0; |
| |
| #ifdef ASSERT |
| bool reg_destroyed[RegisterImpl::number_of_registers]; |
| bool freg_destroyed[FloatRegisterImpl::number_of_registers]; |
| for ( int r = 0 ; r < RegisterImpl::number_of_registers ; r++ ) { |
| reg_destroyed[r] = false; |
| } |
| for ( int f = 0 ; f < FloatRegisterImpl::number_of_registers ; f++ ) { |
| freg_destroyed[f] = false; |
| } |
| |
| #endif /* ASSERT */ |
| |
| // This may iterate in two different directions depending on the |
| // kind of native it is. The reason is that for regular JNI natives |
| // the incoming and outgoing registers are offset upwards and for |
| // critical natives they are offset down. |
| GrowableArray<int> arg_order(2 * total_in_args); |
| VMRegPair tmp_vmreg; |
| tmp_vmreg.set1(r19->as_VMReg()); |
| |
| if (!is_critical_native) { |
| for (int i = total_in_args - 1, c_arg = total_c_args - 1; i >= 0; i--, c_arg--) { |
| arg_order.push(i); |
| arg_order.push(c_arg); |
| } |
| } else { |
| // Compute a valid move order, using tmp_vmreg to break any cycles |
| ComputeMoveOrder cmo(total_in_args, in_regs, total_c_args, out_regs, in_sig_bt, arg_order, tmp_vmreg); |
| } |
| |
| int temploc = -1; |
| for (int ai = 0; ai < arg_order.length(); ai += 2) { |
| int i = arg_order.at(ai); |
| int c_arg = arg_order.at(ai + 1); |
| __ block_comment(err_msg("move %d -> %d", i, c_arg)); |
| if (c_arg == -1) { |
| assert(is_critical_native, "should only be required for critical natives"); |
| // This arg needs to be moved to a temporary |
| __ mov(tmp_vmreg.first()->as_Register(), in_regs[i].first()->as_Register()); |
| in_regs[i] = tmp_vmreg; |
| temploc = i; |
| continue; |
| } else if (i == -1) { |
| assert(is_critical_native, "should only be required for critical natives"); |
| // Read from the temporary location |
| assert(temploc != -1, "must be valid"); |
| i = temploc; |
| temploc = -1; |
| } |
| #ifdef ASSERT |
| if (in_regs[i].first()->is_Register()) { |
| assert(!reg_destroyed[in_regs[i].first()->as_Register()->encoding()], "destroyed reg!"); |
| } else if (in_regs[i].first()->is_FloatRegister()) { |
| assert(!freg_destroyed[in_regs[i].first()->as_FloatRegister()->encoding()], "destroyed reg!"); |
| } |
| if (out_regs[c_arg].first()->is_Register()) { |
| reg_destroyed[out_regs[c_arg].first()->as_Register()->encoding()] = true; |
| } else if (out_regs[c_arg].first()->is_FloatRegister()) { |
| freg_destroyed[out_regs[c_arg].first()->as_FloatRegister()->encoding()] = true; |
| } |
| #endif /* ASSERT */ |
| switch (in_sig_bt[i]) { |
| case T_ARRAY: |
| if (is_critical_native) { |
| unpack_array_argument(masm, in_regs[i], in_elem_bt[i], out_regs[c_arg + 1], out_regs[c_arg]); |
| c_arg++; |
| #ifdef ASSERT |
| if (out_regs[c_arg].first()->is_Register()) { |
| reg_destroyed[out_regs[c_arg].first()->as_Register()->encoding()] = true; |
| } else if (out_regs[c_arg].first()->is_FloatRegister()) { |
| freg_destroyed[out_regs[c_arg].first()->as_FloatRegister()->encoding()] = true; |
| } |
| #endif |
| int_args++; |
| break; |
| } |
| case T_OBJECT: |
| assert(!is_critical_native, "no oop arguments"); |
| object_move(masm, map, oop_handle_offset, stack_slots, in_regs[i], out_regs[c_arg], |
| ((i == 0) && (!is_static)), |
| &receiver_offset); |
| int_args++; |
| break; |
| case T_VOID: |
| break; |
| |
| case T_FLOAT: |
| float_move(masm, in_regs[i], out_regs[c_arg]); |
| float_args++; |
| break; |
| |
| case T_DOUBLE: |
| assert( i + 1 < total_in_args && |
| in_sig_bt[i + 1] == T_VOID && |
| out_sig_bt[c_arg+1] == T_VOID, "bad arg list"); |
| double_move(masm, in_regs[i], out_regs[c_arg]); |
| float_args++; |
| break; |
| |
| case T_LONG : |
| long_move(masm, in_regs[i], out_regs[c_arg]); |
| int_args++; |
| break; |
| |
| case T_ADDRESS: assert(false, "found T_ADDRESS in java args"); |
| |
| default: |
| move32_64(masm, in_regs[i], out_regs[c_arg]); |
| int_args++; |
| } |
| } |
| |
| // point c_arg at the first arg that is already loaded in case we |
| // need to spill before we call out |
| int c_arg = total_c_args - total_in_args; |
| |
| // Pre-load a static method's oop into c_rarg1. |
| if (method->is_static() && !is_critical_native) { |
| |
| // load oop into a register |
| __ movoop(c_rarg1, |
| JNIHandles::make_local(method->method_holder()->java_mirror()), |
| /*immediate*/true); |
| |
| // Now handlize the static class mirror it's known not-null. |
| __ str(c_rarg1, Address(sp, klass_offset)); |
| map->set_oop(VMRegImpl::stack2reg(klass_slot_offset)); |
| |
| // Now get the handle |
| __ lea(c_rarg1, Address(sp, klass_offset)); |
| // and protect the arg if we must spill |
| c_arg--; |
| } |
| |
| // Change state to native (we save the return address in the thread, since it might not |
| // be pushed on the stack when we do a a stack traversal). It is enough that the pc() |
| // points into the right code segment. It does not have to be the correct return pc. |
| // We use the same pc/oopMap repeatedly when we call out |
| |
| intptr_t the_pc = (intptr_t) __ pc(); |
| oop_maps->add_gc_map(the_pc - start, map); |
| |
| __ set_last_Java_frame(sp, noreg, (address)the_pc, rscratch1); |
| |
| Label dtrace_method_entry, dtrace_method_entry_done; |
| { |
| unsigned long offset; |
| __ adrp(rscratch1, ExternalAddress((address)&DTraceMethodProbes), offset); |
| __ ldrb(rscratch1, Address(rscratch1, offset)); |
| __ cbnzw(rscratch1, dtrace_method_entry); |
| __ bind(dtrace_method_entry_done); |
| } |
| |
| // RedefineClasses() tracing support for obsolete method entry |
| if (RC_TRACE_IN_RANGE(0x00001000, 0x00002000)) { |
| // protect the args we've loaded |
| save_args(masm, total_c_args, c_arg, out_regs); |
| __ mov_metadata(c_rarg1, method()); |
| __ call_VM_leaf( |
| CAST_FROM_FN_PTR(address, SharedRuntime::rc_trace_method_entry), |
| rthread, c_rarg1); |
| restore_args(masm, total_c_args, c_arg, out_regs); |
| } |
| |
| // Lock a synchronized method |
| |
| // Register definitions used by locking and unlocking |
| |
| const Register swap_reg = r0; |
| const Register obj_reg = r19; // Will contain the oop |
| const Register lock_reg = r13; // Address of compiler lock object (BasicLock) |
| const Register old_hdr = r13; // value of old header at unlock time |
| const Register tmp = lr; |
| |
| Label slow_path_lock; |
| Label lock_done; |
| |
| if (method->is_synchronized()) { |
| assert(!is_critical_native, "unhandled"); |
| |
| const int mark_word_offset = BasicLock::displaced_header_offset_in_bytes(); |
| |
| // Get the handle (the 2nd argument) |
| __ mov(oop_handle_reg, c_rarg1); |
| |
| // Get address of the box |
| |
| __ lea(lock_reg, Address(sp, lock_slot_offset * VMRegImpl::stack_slot_size)); |
| |
| // Load the oop from the handle |
| __ ldr(obj_reg, Address(oop_handle_reg, 0)); |
| |
| if (UseBiasedLocking) { |
| __ biased_locking_enter(lock_reg, obj_reg, swap_reg, tmp, false, lock_done, &slow_path_lock); |
| } |
| |
| // Load (object->mark() | 1) into swap_reg %r0 |
| __ ldr(rscratch1, Address(obj_reg, 0)); |
| __ orr(swap_reg, rscratch1, 1); |
| |
| // Save (object->mark() | 1) into BasicLock's displaced header |
| __ str(swap_reg, Address(lock_reg, mark_word_offset)); |
| |
| // src -> dest iff dest == r0 else r0 <- dest |
| { Label here; |
| __ cmpxchgptr(r0, lock_reg, obj_reg, rscratch1, lock_done, /*fallthrough*/NULL); |
| } |
| |
| // Hmm should this move to the slow path code area??? |
| |
| // Test if the oopMark is an obvious stack pointer, i.e., |
| // 1) (mark & 3) == 0, and |
| // 2) sp <= mark < mark + os::pagesize() |
| // These 3 tests can be done by evaluating the following |
| // expression: ((mark - sp) & (3 - os::vm_page_size())), |
| // assuming both stack pointer and pagesize have their |
| // least significant 2 bits clear. |
| // NOTE: the oopMark is in swap_reg %r0 as the result of cmpxchg |
| |
| __ sub(swap_reg, sp, swap_reg); |
| __ neg(swap_reg, swap_reg); |
| __ ands(swap_reg, swap_reg, 3 - os::vm_page_size()); |
| |
| // Save the test result, for recursive case, the result is zero |
| __ str(swap_reg, Address(lock_reg, mark_word_offset)); |
| __ br(Assembler::NE, slow_path_lock); |
| |
| // Slow path will re-enter here |
| |
| __ bind(lock_done); |
| } |
| |
| |
| // Finally just about ready to make the JNI call |
| |
| // get JNIEnv* which is first argument to native |
| if (!is_critical_native) { |
| __ lea(c_rarg0, Address(rthread, in_bytes(JavaThread::jni_environment_offset()))); |
| } |
| |
| // Now set thread in native |
| __ mov(rscratch1, _thread_in_native); |
| __ lea(rscratch2, Address(rthread, JavaThread::thread_state_offset())); |
| __ stlrw(rscratch1, rscratch2); |
| |
| { |
| int return_type = 0; |
| switch (ret_type) { |
| case T_VOID: break; |
| return_type = 0; break; |
| case T_CHAR: |
| case T_BYTE: |
| case T_SHORT: |
| case T_INT: |
| case T_BOOLEAN: |
| case T_LONG: |
| return_type = 1; break; |
| case T_ARRAY: |
| case T_OBJECT: |
| return_type = 1; break; |
| case T_FLOAT: |
| return_type = 2; break; |
| case T_DOUBLE: |
| return_type = 3; break; |
| default: |
| ShouldNotReachHere(); |
| } |
| rt_call(masm, native_func, |
| int_args + 2, // AArch64 passes up to 8 args in int registers |
| float_args, // and up to 8 float args |
| return_type); |
| } |
| |
| // Unpack native results. |
| switch (ret_type) { |
| case T_BOOLEAN: __ ubfx(r0, r0, 0, 8); break; |
| case T_CHAR : __ ubfx(r0, r0, 0, 16); break; |
| case T_BYTE : __ sbfx(r0, r0, 0, 8); break; |
| case T_SHORT : __ sbfx(r0, r0, 0, 16); break; |
| case T_INT : __ sbfx(r0, r0, 0, 32); break; |
| case T_DOUBLE : |
| case T_FLOAT : |
| // Result is in v0 we'll save as needed |
| break; |
| case T_ARRAY: // Really a handle |
| case T_OBJECT: // Really a handle |
| break; // can't de-handlize until after safepoint check |
| case T_VOID: break; |
| case T_LONG: break; |
| default : ShouldNotReachHere(); |
| } |
| |
| // Switch thread to "native transition" state before reading the synchronization state. |
| // This additional state is necessary because reading and testing the synchronization |
| // state is not atomic w.r.t. GC, as this scenario demonstrates: |
| // Java thread A, in _thread_in_native state, loads _not_synchronized and is preempted. |
| // VM thread changes sync state to synchronizing and suspends threads for GC. |
| // Thread A is resumed to finish this native method, but doesn't block here since it |
| // didn't see any synchronization is progress, and escapes. |
| __ mov(rscratch1, _thread_in_native_trans); |
| |
| if(os::is_MP()) { |
| if (UseMembar) { |
| __ strw(rscratch1, Address(rthread, JavaThread::thread_state_offset())); |
| |
| // Force this write out before the read below |
| __ dmb(Assembler::SY); |
| } else { |
| __ lea(rscratch2, Address(rthread, JavaThread::thread_state_offset())); |
| __ stlrw(rscratch1, rscratch2); |
| |
| // Write serialization page so VM thread can do a pseudo remote membar. |
| // We use the current thread pointer to calculate a thread specific |
| // offset to write to within the page. This minimizes bus traffic |
| // due to cache line collision. |
| __ serialize_memory(rthread, r2); |
| } |
| } |
| |
| // check for safepoint operation in progress and/or pending suspend requests |
| Label safepoint_in_progress, safepoint_in_progress_done; |
| { |
| assert(SafepointSynchronize::_not_synchronized == 0, "fix this code"); |
| unsigned long offset; |
| __ adrp(rscratch1, |
| ExternalAddress((address)SafepointSynchronize::address_of_state()), |
| offset); |
| __ ldrw(rscratch1, Address(rscratch1, offset)); |
| __ cbnzw(rscratch1, safepoint_in_progress); |
| __ ldrw(rscratch1, Address(rthread, JavaThread::suspend_flags_offset())); |
| __ cbnzw(rscratch1, safepoint_in_progress); |
| __ bind(safepoint_in_progress_done); |
| } |
| |
| // change thread state |
| Label after_transition; |
| __ mov(rscratch1, _thread_in_Java); |
| __ lea(rscratch2, Address(rthread, JavaThread::thread_state_offset())); |
| __ stlrw(rscratch1, rscratch2); |
| __ bind(after_transition); |
| |
| Label reguard; |
| Label reguard_done; |
| __ ldrb(rscratch1, Address(rthread, JavaThread::stack_guard_state_offset())); |
| __ cmpw(rscratch1, JavaThread::stack_guard_yellow_reserved_disabled); |
| __ br(Assembler::EQ, reguard); |
| __ bind(reguard_done); |
| |
| // native result if any is live |
| |
| // Unlock |
| Label unlock_done; |
| Label slow_path_unlock; |
| if (method->is_synchronized()) { |
| |
| // Get locked oop from the handle we passed to jni |
| __ ldr(obj_reg, Address(oop_handle_reg, 0)); |
| |
| Label done; |
| |
| if (UseBiasedLocking) { |
| __ biased_locking_exit(obj_reg, old_hdr, done); |
| } |
| |
| // Simple recursive lock? |
| |
| __ ldr(rscratch1, Address(sp, lock_slot_offset * VMRegImpl::stack_slot_size)); |
| __ cbz(rscratch1, done); |
| |
| // Must save r0 if if it is live now because cmpxchg must use it |
| if (ret_type != T_FLOAT && ret_type != T_DOUBLE && ret_type != T_VOID) { |
| save_native_result(masm, ret_type, stack_slots); |
| } |
| |
| |
| // get address of the stack lock |
| __ lea(r0, Address(sp, lock_slot_offset * VMRegImpl::stack_slot_size)); |
| // get old displaced header |
| __ ldr(old_hdr, Address(r0, 0)); |
| |
| // Atomic swap old header if oop still contains the stack lock |
| Label succeed; |
| __ cmpxchgptr(r0, old_hdr, obj_reg, rscratch1, succeed, &slow_path_unlock); |
| __ bind(succeed); |
| |
| // slow path re-enters here |
| __ bind(unlock_done); |
| if (ret_type != T_FLOAT && ret_type != T_DOUBLE && ret_type != T_VOID) { |
| restore_native_result(masm, ret_type, stack_slots); |
| } |
| |
| __ bind(done); |
| } |
| |
| Label dtrace_method_exit, dtrace_method_exit_done; |
| { |
| unsigned long offset; |
| __ adrp(rscratch1, ExternalAddress((address)&DTraceMethodProbes), offset); |
| __ ldrb(rscratch1, Address(rscratch1, offset)); |
| __ cbnzw(rscratch1, dtrace_method_exit); |
| __ bind(dtrace_method_exit_done); |
| } |
| |
| __ reset_last_Java_frame(false, true); |
| |
| // Unpack oop result |
| if (ret_type == T_OBJECT || ret_type == T_ARRAY) { |
| Label L; |
| __ cbz(r0, L); |
| __ ldr(r0, Address(r0, 0)); |
| __ bind(L); |
| __ verify_oop(r0); |
| } |
| |
| if (!is_critical_native) { |
| // reset handle block |
| __ ldr(r2, Address(rthread, JavaThread::active_handles_offset())); |
| __ str(zr, Address(r2, JNIHandleBlock::top_offset_in_bytes())); |
| } |
| |
| __ leave(); |
| |
| if (!is_critical_native) { |
| // Any exception pending? |
| __ ldr(rscratch1, Address(rthread, in_bytes(Thread::pending_exception_offset()))); |
| __ cbnz(rscratch1, exception_pending); |
| } |
| |
| // record exit from native wrapper code |
| if (NotifySimulator) { |
| __ notify(Assembler::method_reentry); |
| } |
| |
| // We're done |
| __ ret(lr); |
| |
| // Unexpected paths are out of line and go here |
| |
| if (!is_critical_native) { |
| // forward the exception |
| __ bind(exception_pending); |
| |
| // and forward the exception |
| __ far_jump(RuntimeAddress(StubRoutines::forward_exception_entry())); |
| } |
| |
| // Slow path locking & unlocking |
| if (method->is_synchronized()) { |
| |
| __ block_comment("Slow path lock {"); |
| __ bind(slow_path_lock); |
| |
| // has last_Java_frame setup. No exceptions so do vanilla call not call_VM |
| // args are (oop obj, BasicLock* lock, JavaThread* thread) |
| |
| // protect the args we've loaded |
| save_args(masm, total_c_args, c_arg, out_regs); |
| |
| __ mov(c_rarg0, obj_reg); |
| __ mov(c_rarg1, lock_reg); |
| __ mov(c_rarg2, rthread); |
| |
| // Not a leaf but we have last_Java_frame setup as we want |
| __ call_VM_leaf(CAST_FROM_FN_PTR(address, SharedRuntime::complete_monitor_locking_C), 3); |
| restore_args(masm, total_c_args, c_arg, out_regs); |
| |
| #ifdef ASSERT |
| { Label L; |
| __ ldr(rscratch1, Address(rthread, in_bytes(Thread::pending_exception_offset()))); |
| __ cbz(rscratch1, L); |
| __ stop("no pending exception allowed on exit from monitorenter"); |
| __ bind(L); |
| } |
| #endif |
| __ b(lock_done); |
| |
| __ block_comment("} Slow path lock"); |
| |
| __ block_comment("Slow path unlock {"); |
| __ bind(slow_path_unlock); |
| |
| // If we haven't already saved the native result we must save it now as xmm registers |
| // are still exposed. |
| |
| if (ret_type == T_FLOAT || ret_type == T_DOUBLE ) { |
| save_native_result(masm, ret_type, stack_slots); |
| } |
| |
| __ mov(c_rarg2, rthread); |
| __ lea(c_rarg1, Address(sp, lock_slot_offset * VMRegImpl::stack_slot_size)); |
| __ mov(c_rarg0, obj_reg); |
| |
| // Save pending exception around call to VM (which contains an EXCEPTION_MARK) |
| // NOTE that obj_reg == r19 currently |
| __ ldr(r19, Address(rthread, in_bytes(Thread::pending_exception_offset()))); |
| __ str(zr, Address(rthread, in_bytes(Thread::pending_exception_offset()))); |
| |
| rt_call(masm, CAST_FROM_FN_PTR(address, SharedRuntime::complete_monitor_unlocking_C), 3, 0, 1); |
| |
| #ifdef ASSERT |
| { |
| Label L; |
| __ ldr(rscratch1, Address(rthread, in_bytes(Thread::pending_exception_offset()))); |
| __ cbz(rscratch1, L); |
| __ stop("no pending exception allowed on exit complete_monitor_unlocking_C"); |
| __ bind(L); |
| } |
| #endif /* ASSERT */ |
| |
| __ str(r19, Address(rthread, in_bytes(Thread::pending_exception_offset()))); |
| |
| if (ret_type == T_FLOAT || ret_type == T_DOUBLE ) { |
| restore_native_result(masm, ret_type, stack_slots); |
| } |
| __ b(unlock_done); |
| |
| __ block_comment("} Slow path unlock"); |
| |
| } // synchronized |
| |
| // SLOW PATH Reguard the stack if needed |
| |
| __ bind(reguard); |
| save_native_result(masm, ret_type, stack_slots); |
| rt_call(masm, CAST_FROM_FN_PTR(address, SharedRuntime::reguard_yellow_pages), 0, 0, 0); |
| restore_native_result(masm, ret_type, stack_slots); |
| // and continue |
| __ b(reguard_done); |
| |
| // SLOW PATH safepoint |
| { |
| __ block_comment("safepoint {"); |
| __ bind(safepoint_in_progress); |
| |
| // Don't use call_VM as it will see a possible pending exception and forward it |
| // and never return here preventing us from clearing _last_native_pc down below. |
| // |
| save_native_result(masm, ret_type, stack_slots); |
| __ mov(c_rarg0, rthread); |
| #ifndef PRODUCT |
| assert(frame::arg_reg_save_area_bytes == 0, "not expecting frame reg save area"); |
| #endif |
| if (!is_critical_native) { |
| __ lea(rscratch1, RuntimeAddress(CAST_FROM_FN_PTR(address, JavaThread::check_special_condition_for_native_trans))); |
| } else { |
| __ lea(rscratch1, RuntimeAddress(CAST_FROM_FN_PTR(address, JavaThread::check_special_condition_for_native_trans_and_transition))); |
| } |
| __ blrt(rscratch1, 1, 0, 1); |
| __ maybe_isb(); |
| // Restore any method result value |
| restore_native_result(masm, ret_type, stack_slots); |
| |
| if (is_critical_native) { |
| // The call above performed the transition to thread_in_Java so |
| // skip the transition logic above. |
| __ b(after_transition); |
| } |
| |
| __ b(safepoint_in_progress_done); |
| __ block_comment("} safepoint"); |
| } |
| |
| // SLOW PATH dtrace support |
| { |
| __ block_comment("dtrace entry {"); |
| __ bind(dtrace_method_entry); |
| |
| // We have all of the arguments setup at this point. We must not touch any register |
| // argument registers at this point (what if we save/restore them there are no oop? |
| |
| save_args(masm, total_c_args, c_arg, out_regs); |
| __ mov_metadata(c_rarg1, method()); |
| __ call_VM_leaf( |
| CAST_FROM_FN_PTR(address, SharedRuntime::dtrace_method_entry), |
| rthread, c_rarg1); |
| restore_args(masm, total_c_args, c_arg, out_regs); |
| __ b(dtrace_method_entry_done); |
| __ block_comment("} dtrace entry"); |
| } |
| |
| { |
| __ block_comment("dtrace exit {"); |
| __ bind(dtrace_method_exit); |
| save_native_result(masm, ret_type, stack_slots); |
| __ mov_metadata(c_rarg1, method()); |
| __ call_VM_leaf( |
| CAST_FROM_FN_PTR(address, SharedRuntime::dtrace_method_exit), |
| rthread, c_rarg1); |
| restore_native_result(masm, ret_type, stack_slots); |
| __ b(dtrace_method_exit_done); |
| __ block_comment("} dtrace exit"); |
| } |
| |
| |
| __ flush(); |
| |
| nmethod *nm = nmethod::new_native_nmethod(method, |
| compile_id, |
| masm->code(), |
| vep_offset, |
| frame_complete, |
| stack_slots / VMRegImpl::slots_per_word, |
| (is_static ? in_ByteSize(klass_offset) : in_ByteSize(receiver_offset)), |
| in_ByteSize(lock_slot_offset*VMRegImpl::stack_slot_size), |
| oop_maps); |
| |
| if (is_critical_native) { |
| nm->set_lazy_critical_native(true); |
| } |
| |
| return nm; |
| |
| } |
| |
| // this function returns the adjust size (in number of words) to a c2i adapter |
| // activation for use during deoptimization |
| int Deoptimization::last_frame_adjust(int callee_parameters, int callee_locals) { |
| assert(callee_locals >= callee_parameters, |
| "test and remove; got more parms than locals"); |
| if (callee_locals < callee_parameters) |
| return 0; // No adjustment for negative locals |
| int diff = (callee_locals - callee_parameters) * Interpreter::stackElementWords; |
| // diff is counted in stack words |
| return round_to(diff, 2); |
| } |
| |
| |
| //------------------------------generate_deopt_blob---------------------------- |
| void SharedRuntime::generate_deopt_blob() { |
| // Allocate space for the code |
| ResourceMark rm; |
| // Setup code generation tools |
| int pad = 0; |
| #if INCLUDE_JVMCI |
| if (EnableJVMCI) { |
| pad += 512; // Increase the buffer size when compiling for JVMCI |
| } |
| #endif |
| CodeBuffer buffer("deopt_blob", 2048+pad, 1024); |
| MacroAssembler* masm = new MacroAssembler(&buffer); |
| int frame_size_in_words; |
| OopMap* map = NULL; |
| OopMapSet *oop_maps = new OopMapSet(); |
| |
| #ifdef BUILTIN_SIM |
| AArch64Simulator *simulator; |
| if (NotifySimulator) { |
| simulator = AArch64Simulator::get_current(UseSimulatorCache, DisableBCCheck); |
| simulator->notifyCompile(const_cast<char*>("SharedRuntime::deopt_blob"), __ pc()); |
| } |
| #endif |
| |
| // ------------- |
| // This code enters when returning to a de-optimized nmethod. A return |
| // address has been pushed on the the stack, and return values are in |
| // registers. |
| // If we are doing a normal deopt then we were called from the patched |
| // nmethod from the point we returned to the nmethod. So the return |
| // address on the stack is wrong by NativeCall::instruction_size |
| // We will adjust the value so it looks like we have the original return |
| // address on the stack (like when we eagerly deoptimized). |
| // In the case of an exception pending when deoptimizing, we enter |
| // with a return address on the stack that points after the call we patched |
| // into the exception handler. We have the following register state from, |
| // e.g., the forward exception stub (see stubGenerator_x86_64.cpp). |
| // r0: exception oop |
| // r19: exception handler |
| // r3: throwing pc |
| // So in this case we simply jam r3 into the useless return address and |
| // the stack looks just like we want. |
| // |
| // At this point we need to de-opt. We save the argument return |
| // registers. We call the first C routine, fetch_unroll_info(). This |
| // routine captures the return values and returns a structure which |
| // describes the current frame size and the sizes of all replacement frames. |
| // The current frame is compiled code and may contain many inlined |
| // functions, each with their own JVM state. We pop the current frame, then |
| // push all the new frames. Then we call the C routine unpack_frames() to |
| // populate these frames. Finally unpack_frames() returns us the new target |
| // address. Notice that callee-save registers are BLOWN here; they have |
| // already been captured in the vframeArray at the time the return PC was |
| // patched. |
| address start = __ pc(); |
| Label cont; |
| |
| // Prolog for non exception case! |
| |
| // Save everything in sight. |
| map = RegisterSaver::save_live_registers(masm, 0, &frame_size_in_words); |
| |
| // Normal deoptimization. Save exec mode for unpack_frames. |
| __ movw(rcpool, Deoptimization::Unpack_deopt); // callee-saved |
| __ b(cont); |
| |
| int reexecute_offset = __ pc() - start; |
| #if defined(INCLUDE_JVMCI) && !defined(COMPILER1) |
| if (EnableJVMCI && UseJVMCICompiler) { |
| // JVMCI does not use this kind of deoptimization |
| __ should_not_reach_here(); |
| } |
| #endif |
| |
| // Reexecute case |
| // return address is the pc describes what bci to do re-execute at |
| |
| // No need to update map as each call to save_live_registers will produce identical oopmap |
| (void) RegisterSaver::save_live_registers(masm, 0, &frame_size_in_words); |
| |
| __ movw(rcpool, Deoptimization::Unpack_reexecute); // callee-saved |
| __ b(cont); |
| |
| #if INCLUDE_JVMCI |
| Label after_fetch_unroll_info_call; |
| int implicit_exception_uncommon_trap_offset = 0; |
| int uncommon_trap_offset = 0; |
| |
| if (EnableJVMCI) { |
| implicit_exception_uncommon_trap_offset = __ pc() - start; |
| |
| __ ldr(lr, Address(rthread, in_bytes(JavaThread::jvmci_implicit_exception_pc_offset()))); |
| __ str(zr, Address(rthread, in_bytes(JavaThread::jvmci_implicit_exception_pc_offset()))); |
| |
| uncommon_trap_offset = __ pc() - start; |
| |
| // Save everything in sight. |
| RegisterSaver::save_live_registers(masm, 0, &frame_size_in_words); |
| // fetch_unroll_info needs to call last_java_frame() |
| Label retaddr; |
| __ set_last_Java_frame(sp, noreg, retaddr, rscratch1); |
| |
| __ ldrw(c_rarg1, Address(rthread, in_bytes(JavaThread::pending_deoptimization_offset()))); |
| __ movw(rscratch1, -1); |
| __ strw(rscratch1, Address(rthread, in_bytes(JavaThread::pending_deoptimization_offset()))); |
| |
| __ movw(rcpool, (int32_t)Deoptimization::Unpack_reexecute); |
| __ mov(c_rarg0, rthread); |
| __ lea(rscratch1, |
| RuntimeAddress(CAST_FROM_FN_PTR(address, |
| Deoptimization::uncommon_trap))); |
| __ blrt(rscratch1, 2, 0, MacroAssembler::ret_type_integral); |
| __ bind(retaddr); |
| oop_maps->add_gc_map( __ pc()-start, map->deep_copy()); |
| |
| __ reset_last_Java_frame(false, false); |
| |
| __ b(after_fetch_unroll_info_call); |
| } // EnableJVMCI |
| #endif // INCLUDE_JVMCI |
| |
| int exception_offset = __ pc() - start; |
| |
| // Prolog for exception case |
| |
| // all registers are dead at this entry point, except for r0, and |
| // r3 which contain the exception oop and exception pc |
| // respectively. Set them in TLS and fall thru to the |
| // unpack_with_exception_in_tls entry point. |
| |
| __ str(r3, Address(rthread, JavaThread::exception_pc_offset())); |
| __ str(r0, Address(rthread, JavaThread::exception_oop_offset())); |
| |
| int exception_in_tls_offset = __ pc() - start; |
| |
| // new implementation because exception oop is now passed in JavaThread |
| |
| // Prolog for exception case |
| // All registers must be preserved because they might be used by LinearScan |
| // Exceptiop oop and throwing PC are passed in JavaThread |
| // tos: stack at point of call to method that threw the exception (i.e. only |
| // args are on the stack, no return address) |
| |
| // The return address pushed by save_live_registers will be patched |
| // later with the throwing pc. The correct value is not available |
| // now because loading it from memory would destroy registers. |
| |
| // NB: The SP at this point must be the SP of the method that is |
| // being deoptimized. Deoptimization assumes that the frame created |
| // here by save_live_registers is immediately below the method's SP. |
| // This is a somewhat fragile mechanism. |
| |
| // Save everything in sight. |
| map = RegisterSaver::save_live_registers(masm, 0, &frame_size_in_words); |
| |
| // Now it is safe to overwrite any register |
| |
| // Deopt during an exception. Save exec mode for unpack_frames. |
| __ mov(rcpool, Deoptimization::Unpack_exception); // callee-saved |
| |
| // load throwing pc from JavaThread and patch it as the return address |
| // of the current frame. Then clear the field in JavaThread |
| |
| __ ldr(r3, Address(rthread, JavaThread::exception_pc_offset())); |
| __ str(r3, Address(rfp, wordSize)); |
| __ str(zr, Address(rthread, JavaThread::exception_pc_offset())); |
| |
| #ifdef ASSERT |
| // verify that there is really an exception oop in JavaThread |
| __ ldr(r0, Address(rthread, JavaThread::exception_oop_offset())); |
| __ verify_oop(r0); |
| |
| // verify that there is no pending exception |
| Label no_pending_exception; |
| __ ldr(rscratch1, Address(rthread, Thread::pending_exception_offset())); |
| __ cbz(rscratch1, no_pending_exception); |
| __ stop("must not have pending exception here"); |
| __ bind(no_pending_exception); |
| #endif |
| |
| __ bind(cont); |
| |
| // Call C code. Need thread and this frame, but NOT official VM entry |
| // crud. We cannot block on this call, no GC can happen. |
| // |
| // UnrollBlock* fetch_unroll_info(JavaThread* thread) |
| |
| // fetch_unroll_info needs to call last_java_frame(). |
| |
| Label retaddr; |
| __ set_last_Java_frame(sp, noreg, retaddr, rscratch1); |
| #ifdef ASSERT0 |
| { Label L; |
| __ ldr(rscratch1, Address(rthread, |
| JavaThread::last_Java_fp_offset())); |
| __ cbz(rscratch1, L); |
| __ stop("SharedRuntime::generate_deopt_blob: last_Java_fp not cleared"); |
| __ bind(L); |
| } |
| #endif // ASSERT |
| __ mov(c_rarg0, rthread); |
| __ mov(c_rarg1, rcpool); |
| __ lea(rscratch1, RuntimeAddress(CAST_FROM_FN_PTR(address, Deoptimization::fetch_unroll_info))); |
| __ blrt(rscratch1, 1, 0, 1); |
| __ bind(retaddr); |
| |
| // Need to have an oopmap that tells fetch_unroll_info where to |
| // find any register it might need. |
| oop_maps->add_gc_map(__ pc() - start, map); |
| |
| __ reset_last_Java_frame(false, true); |
| |
| #if INCLUDE_JVMCI |
| if (EnableJVMCI) { |
| __ bind(after_fetch_unroll_info_call); |
| } |
| #endif |
| |
| // Load UnrollBlock* into r5 |
| __ mov(r5, r0); |
| |
| __ ldrw(rcpool, Address(r5, Deoptimization::UnrollBlock::unpack_kind_offset_in_bytes())); |
| Label noException; |
| __ cmpw(rcpool, Deoptimization::Unpack_exception); // Was exception pending? |
| __ br(Assembler::NE, noException); |
| __ ldr(r0, Address(rthread, JavaThread::exception_oop_offset())); |
| // QQQ this is useless it was NULL above |
| __ ldr(r3, Address(rthread, JavaThread::exception_pc_offset())); |
| __ str(zr, Address(rthread, JavaThread::exception_oop_offset())); |
| __ str(zr, Address(rthread, JavaThread::exception_pc_offset())); |
| |
| __ verify_oop(r0); |
| |
| // Overwrite the result registers with the exception results. |
| __ str(r0, Address(sp, RegisterSaver::r0_offset_in_bytes())); |
| // I think this is useless |
| // __ str(r3, Address(sp, RegisterSaver::r3_offset_in_bytes())); |
| |
| __ bind(noException); |
| |
| // Only register save data is on the stack. |
| // Now restore the result registers. Everything else is either dead |
| // or captured in the vframeArray. |
| RegisterSaver::restore_result_registers(masm); |
| |
| // All of the register save area has been popped of the stack. Only the |
| // return address remains. |
| |
| // Pop all the frames we must move/replace. |
| // |
| // Frame picture (youngest to oldest) |
| // 1: self-frame (no frame link) |
| // 2: deopting frame (no frame link) |
| // 3: caller of deopting frame (could be compiled/interpreted). |
| // |
| // Note: by leaving the return address of self-frame on the stack |
| // and using the size of frame 2 to adjust the stack |
| // when we are done the return to frame 3 will still be on the stack. |
| |
| // Pop deoptimized frame |
| __ ldrw(r2, Address(r5, Deoptimization::UnrollBlock::size_of_deoptimized_frame_offset_in_bytes())); |
| __ sub(r2, r2, 2 * wordSize); |
| __ add(sp, sp, r2); |
| __ ldp(rfp, lr, __ post(sp, 2 * wordSize)); |
| // LR should now be the return address to the caller (3) |
| |
| #ifdef ASSERT |
| // Compilers generate code that bang the stack by as much as the |
| // interpreter would need. So this stack banging should never |
| // trigger a fault. Verify that it does not on non product builds. |
| if (UseStackBanging) { |
| __ ldrw(r19, Address(r5, Deoptimization::UnrollBlock::total_frame_sizes_offset_in_bytes())); |
| __ bang_stack_size(r19, r2); |
| } |
| #endif |
| // Load address of array of frame pcs into r2 |
| __ ldr(r2, Address(r5, Deoptimization::UnrollBlock::frame_pcs_offset_in_bytes())); |
| |
| // Trash the old pc |
| // __ addptr(sp, wordSize); FIXME ???? |
| |
| // Load address of array of frame sizes into r4 |
| __ ldr(r4, Address(r5, Deoptimization::UnrollBlock::frame_sizes_offset_in_bytes())); |
| |
| // Load counter into r3 |
| __ ldrw(r3, Address(r5, Deoptimization::UnrollBlock::number_of_frames_offset_in_bytes())); |
| |
| // Now adjust the caller's stack to make up for the extra locals |
| // but record the original sp so that we can save it in the skeletal interpreter |
| // frame and the stack walking of interpreter_sender will get the unextended sp |
| // value and not the "real" sp value. |
| |
| const Register sender_sp = r6; |
| |
| __ mov(sender_sp, sp); |
| __ ldrw(r19, Address(r5, |
| Deoptimization::UnrollBlock:: |
| caller_adjustment_offset_in_bytes())); |
| __ sub(sp, sp, r19); |
| |
| // Push interpreter frames in a loop |
| __ mov(rscratch1, (address)0xDEADDEAD); // Make a recognizable pattern |
| __ mov(rscratch2, rscratch1); |
| Label loop; |
| __ bind(loop); |
| __ ldr(r19, Address(__ post(r4, wordSize))); // Load frame size |
| __ sub(r19, r19, 2*wordSize); // We'll push pc and fp by hand |
| __ ldr(lr, Address(__ post(r2, wordSize))); // Load pc |
| __ enter(); // Save old & set new fp |
| __ sub(sp, sp, r19); // Prolog |
| // This value is corrected by layout_activation_impl |
| __ str(zr, Address(rfp, frame::interpreter_frame_last_sp_offset * wordSize)); |
| __ str(sender_sp, Address(rfp, frame::interpreter_frame_sender_sp_offset * wordSize)); // Make it walkable |
| __ mov(sender_sp, sp); // Pass sender_sp to next frame |
| __ sub(r3, r3, 1); // Decrement counter |
| __ cbnz(r3, loop); |
| |
| // Re-push self-frame |
| __ ldr(lr, Address(r2)); |
| __ enter(); |
| |
| // Allocate a full sized register save area. We subtract 2 because |
| // enter() just pushed 2 words |
| __ sub(sp, sp, (frame_size_in_words - 2) * wordSize); |
| |
| // Restore frame locals after moving the frame |
| __ strd(v0, Address(sp, RegisterSaver::v0_offset_in_bytes())); |
| __ str(r0, Address(sp, RegisterSaver::r0_offset_in_bytes())); |
| |
| // Call C code. Need thread but NOT official VM entry |
| // crud. We cannot block on this call, no GC can happen. Call should |
| // restore return values to their stack-slots with the new SP. |
| // |
| // void Deoptimization::unpack_frames(JavaThread* thread, int exec_mode) |
| |
| // Use rfp because the frames look interpreted now |
| // Don't need the precise return PC here, just precise enough to point into this code blob. |
| address the_pc = __ pc(); |
| __ set_last_Java_frame(sp, rfp, the_pc, rscratch1); |
| |
| __ mov(c_rarg0, rthread); |
| __ movw(c_rarg1, rcpool); // second arg: exec_mode |
| __ lea(rscratch1, RuntimeAddress(CAST_FROM_FN_PTR(address, Deoptimization::unpack_frames))); |
| __ blrt(rscratch1, 2, 0, 0); |
| |
| // Set an oopmap for the call site |
| // Use the same PC we used for the last java frame |
| oop_maps->add_gc_map(the_pc - start, |
| new OopMap( frame_size_in_words, 0 )); |
| |
| // Clear fp AND pc |
| __ reset_last_Java_frame(true, true); |
| |
| // Collect return values |
| __ ldrd(v0, Address(sp, RegisterSaver::v0_offset_in_bytes())); |
| __ ldr(r0, Address(sp, RegisterSaver::r0_offset_in_bytes())); |
| // I think this is useless (throwing pc?) |
| // __ ldr(r3, Address(sp, RegisterSaver::r3_offset_in_bytes())); |
| |
| // Pop self-frame. |
| __ leave(); // Epilog |
| |
| // Jump to interpreter |
| __ ret(lr); |
| |
| // Make sure all code is generated |
| masm->flush(); |
| |
| _deopt_blob = DeoptimizationBlob::create(&buffer, oop_maps, 0, exception_offset, reexecute_offset, frame_size_in_words); |
| _deopt_blob->set_unpack_with_exception_in_tls_offset(exception_in_tls_offset); |
| #if INCLUDE_JVMCI |
| if (EnableJVMCI) { |
| _deopt_blob->set_uncommon_trap_offset(uncommon_trap_offset); |
| _deopt_blob->set_implicit_exception_uncommon_trap_offset(implicit_exception_uncommon_trap_offset); |
| } |
| #endif |
| #ifdef BUILTIN_SIM |
| if (NotifySimulator) { |
| unsigned char *base = _deopt_blob->code_begin(); |
| simulator->notifyRelocate(start, base - start); |
| } |
| #endif |
| } |
| |
| uint SharedRuntime::out_preserve_stack_slots() { |
| return 0; |
| } |
| |
| #if defined(COMPILER2) || INCLUDE_JVMCI |
| //------------------------------generate_uncommon_trap_blob-------------------- |
| void SharedRuntime::generate_uncommon_trap_blob() { |
| // Allocate space for the code |
| ResourceMark rm; |
| // Setup code generation tools |
| CodeBuffer buffer("uncommon_trap_blob", 2048, 1024); |
| MacroAssembler* masm = new MacroAssembler(&buffer); |
| |
| #ifdef BUILTIN_SIM |
| AArch64Simulator *simulator; |
| if (NotifySimulator) { |
| simulator = AArch64Simulator::get_current(UseSimulatorCache, DisableBCCheck); |
| simulator->notifyCompile(const_cast<char*>("SharedRuntime:uncommon_trap_blob"), __ pc()); |
| } |
| #endif |
| |
| assert(SimpleRuntimeFrame::framesize % 4 == 0, "sp not 16-byte aligned"); |
| |
| address start = __ pc(); |
| |
| // Push self-frame. We get here with a return address in LR |
| // and sp should be 16 byte aligned |
| // push rfp and retaddr by hand |
| __ stp(rfp, lr, Address(__ pre(sp, -2 * wordSize))); |
| // we don't expect an arg reg save area |
| #ifndef PRODUCT |
| assert(frame::arg_reg_save_area_bytes == 0, "not expecting frame reg save area"); |
| #endif |
| // compiler left unloaded_class_index in j_rarg0 move to where the |
| // runtime expects it. |
| if (c_rarg1 != j_rarg0) { |
| __ movw(c_rarg1, j_rarg0); |
| } |
| |
| // we need to set the past SP to the stack pointer of the stub frame |
| // and the pc to the address where this runtime call will return |
| // although actually any pc in this code blob will do). |
| Label retaddr; |
| __ set_last_Java_frame(sp, noreg, retaddr, rscratch1); |
| |
| // Call C code. Need thread but NOT official VM entry |
| // crud. We cannot block on this call, no GC can happen. Call should |
| // capture callee-saved registers as well as return values. |
| // Thread is in rdi already. |
| // |
| // UnrollBlock* uncommon_trap(JavaThread* thread, jint unloaded_class_index); |
| // |
| // n.b. 2 gp args, 0 fp args, integral return type |
| |
| __ mov(c_rarg0, rthread); |
| __ movw(c_rarg2, (unsigned)Deoptimization::Unpack_uncommon_trap); |
| __ lea(rscratch1, |
| RuntimeAddress(CAST_FROM_FN_PTR(address, |
| Deoptimization::uncommon_trap))); |
| __ blrt(rscratch1, 2, 0, MacroAssembler::ret_type_integral); |
| __ bind(retaddr); |
| |
| // Set an oopmap for the call site |
| OopMapSet* oop_maps = new OopMapSet(); |
| OopMap* map = new OopMap(SimpleRuntimeFrame::framesize, 0); |
| |
| // location of rfp is known implicitly by the frame sender code |
| |
| oop_maps->add_gc_map(__ pc() - start, map); |
| |
| __ reset_last_Java_frame(false, true); |
| |
| // move UnrollBlock* into r4 |
| __ mov(r4, r0); |
| |
| #ifdef ASSERT |
| { Label L; |
| __ ldrw(rscratch1, Address(r4, Deoptimization::UnrollBlock::unpack_kind_offset_in_bytes())); |
| __ cmpw(rscratch1, (unsigned)Deoptimization::Unpack_uncommon_trap); |
| __ br(Assembler::EQ, L); |
| __ stop("SharedRuntime::generate_deopt_blob: last_Java_fp not cleared"); |
| __ bind(L); |
| } |
| #endif |
| |
| // Pop all the frames we must move/replace. |
| // |
| // Frame picture (youngest to oldest) |
| // 1: self-frame (no frame link) |
| // 2: deopting frame (no frame link) |
| // 3: caller of deopting frame (could be compiled/interpreted). |
| |
| // Pop self-frame. We have no frame, and must rely only on r0 and sp. |
| __ add(sp, sp, (SimpleRuntimeFrame::framesize) << LogBytesPerInt); // Epilog! |
| |
| // Pop deoptimized frame (int) |
| __ ldrw(r2, Address(r4, |
| Deoptimization::UnrollBlock:: |
| size_of_deoptimized_frame_offset_in_bytes())); |
| __ sub(r2, r2, 2 * wordSize); |
| __ add(sp, sp, r2); |
| __ ldp(rfp, lr, __ post(sp, 2 * wordSize)); |
| // LR should now be the return address to the caller (3) frame |
| |
| #ifdef ASSERT |
| // Compilers generate code that bang the stack by as much as the |
| // interpreter would need. So this stack banging should never |
| // trigger a fault. Verify that it does not on non product builds. |
| if (UseStackBanging) { |
| __ ldrw(r1, Address(r4, |
| Deoptimization::UnrollBlock:: |
| total_frame_sizes_offset_in_bytes())); |
| __ bang_stack_size(r1, r2); |
| } |
| #endif |
| |
| // Load address of array of frame pcs into r2 (address*) |
| __ ldr(r2, Address(r4, |
| Deoptimization::UnrollBlock::frame_pcs_offset_in_bytes())); |
| |
| // Load address of array of frame sizes into r5 (intptr_t*) |
| __ ldr(r5, Address(r4, |
| Deoptimization::UnrollBlock:: |
| frame_sizes_offset_in_bytes())); |
| |
| // Counter |
| __ ldrw(r3, Address(r4, |
| Deoptimization::UnrollBlock:: |
| number_of_frames_offset_in_bytes())); // (int) |
| |
| // Now adjust the caller's stack to make up for the extra locals but |
| // record the original sp so that we can save it in the skeletal |
| // interpreter frame and the stack walking of interpreter_sender |
| // will get the unextended sp value and not the "real" sp value. |
| |
| const Register sender_sp = r8; |
| |
| __ mov(sender_sp, sp); |
| __ ldrw(r1, Address(r4, |
| Deoptimization::UnrollBlock:: |
| caller_adjustment_offset_in_bytes())); // (int) |
| __ sub(sp, sp, r1); |
| |
| // Push interpreter frames in a loop |
| Label loop; |
| __ bind(loop); |
| __ ldr(r1, Address(r5, 0)); // Load frame size |
| __ sub(r1, r1, 2 * wordSize); // We'll push pc and rfp by hand |
| __ ldr(lr, Address(r2, 0)); // Save return address |
| __ enter(); // and old rfp & set new rfp |
| __ sub(sp, sp, r1); // Prolog |
| __ str(sender_sp, Address(rfp, frame::interpreter_frame_sender_sp_offset * wordSize)); // Make it walkable |
| // This value is corrected by layout_activation_impl |
| __ str(zr, Address(rfp, frame::interpreter_frame_last_sp_offset * wordSize)); |
| __ mov(sender_sp, sp); // Pass sender_sp to next frame |
| __ add(r5, r5, wordSize); // Bump array pointer (sizes) |
| __ add(r2, r2, wordSize); // Bump array pointer (pcs) |
| __ subsw(r3, r3, 1); // Decrement counter |
| __ br(Assembler::GT, loop); |
| __ ldr(lr, Address(r2, 0)); // save final return address |
| // Re-push self-frame |
| __ enter(); // & old rfp & set new rfp |
| |
| // Use rfp because the frames look interpreted now |
| // Save "the_pc" since it cannot easily be retrieved using the last_java_SP after we aligned SP. |
| // Don't need the precise return PC here, just precise enough to point into this code blob. |
| address the_pc = __ pc(); |
| __ set_last_Java_frame(sp, rfp, the_pc, rscratch1); |
| |
| // Call C code. Need thread but NOT official VM entry |
| // crud. We cannot block on this call, no GC can happen. Call should |
| // restore return values to their stack-slots with the new SP. |
| // Thread is in rdi already. |
| // |
| // BasicType unpack_frames(JavaThread* thread, int exec_mode); |
| // |
| // n.b. 2 gp args, 0 fp args, integral return type |
| |
| // sp should already be aligned |
| __ mov(c_rarg0, rthread); |
| __ movw(c_rarg1, (unsigned)Deoptimization::Unpack_uncommon_trap); |
| __ lea(rscratch1, RuntimeAddress(CAST_FROM_FN_PTR(address, Deoptimization::unpack_frames))); |
| __ blrt(rscratch1, 2, 0, MacroAssembler::ret_type_integral); |
| |
| // Set an oopmap for the call site |
| // Use the same PC we used for the last java frame |
| oop_maps->add_gc_map(the_pc - start, new OopMap(SimpleRuntimeFrame::framesize, 0)); |
| |
| // Clear fp AND pc |
| __ reset_last_Java_frame(true, true); |
| |
| // Pop self-frame. |
| __ leave(); // Epilog |
| |
| // Jump to interpreter |
| __ ret(lr); |
| |
| // Make sure all code is generated |
| masm->flush(); |
| |
| _uncommon_trap_blob = UncommonTrapBlob::create(&buffer, oop_maps, |
| SimpleRuntimeFrame::framesize >> 1); |
| |
| #ifdef BUILTIN_SIM |
| if (NotifySimulator) { |
| unsigned char *base = _deopt_blob->code_begin(); |
| simulator->notifyRelocate(start, base - start); |
| } |
| #endif |
| } |
| #endif // COMPILER2 |
| |
| |
| //------------------------------generate_handler_blob------ |
| // |
| // Generate a special Compile2Runtime blob that saves all registers, |
| // and setup oopmap. |
| // |
| SafepointBlob* SharedRuntime::generate_handler_blob(address call_ptr, int poll_type) { |
| ResourceMark rm; |
| OopMapSet *oop_maps = new OopMapSet(); |
| OopMap* map; |
| |
| // Allocate space for the code. Setup code generation tools. |
| CodeBuffer buffer("handler_blob", 2048, 1024); |
| MacroAssembler* masm = new MacroAssembler(&buffer); |
| |
| address start = __ pc(); |
| address call_pc = NULL; |
| int frame_size_in_words; |
| bool cause_return = (poll_type == POLL_AT_RETURN); |
| bool save_vectors = (poll_type == POLL_AT_VECTOR_LOOP); |
| |
| // Save registers, fpu state, and flags |
| map = RegisterSaver::save_live_registers(masm, 0, &frame_size_in_words, save_vectors); |
| |
| // The following is basically a call_VM. However, we need the precise |
| // address of the call in order to generate an oopmap. Hence, we do all the |
| // work outselves. |
| |
| Label retaddr; |
| __ set_last_Java_frame(sp, noreg, retaddr, rscratch1); |
| |
| // The return address must always be correct so that frame constructor never |
| // sees an invalid pc. |
| |
| if (!cause_return) { |
| // overwrite the return address pushed by save_live_registers |
| __ ldr(c_rarg0, Address(rthread, JavaThread::saved_exception_pc_offset())); |
| __ str(c_rarg0, Address(rfp, wordSize)); |
| } |
| |
| // Do the call |
| __ mov(c_rarg0, rthread); |
| __ lea(rscratch1, RuntimeAddress(call_ptr)); |
| __ blrt(rscratch1, 1, 0, 1); |
| __ bind(retaddr); |
| |
| // Set an oopmap for the call site. This oopmap will map all |
| // oop-registers and debug-info registers as callee-saved. This |
| // will allow deoptimization at this safepoint to find all possible |
| // debug-info recordings, as well as let GC find all oops. |
| |
| oop_maps->add_gc_map( __ pc() - start, map); |
| |
| Label noException; |
| |
| __ reset_last_Java_frame(false, true); |
| |
| __ maybe_isb(); |
| __ membar(Assembler::LoadLoad | Assembler::LoadStore); |
| |
| __ ldr(rscratch1, Address(rthread, Thread::pending_exception_offset())); |
| __ cbz(rscratch1, noException); |
| |
| // Exception pending |
| |
| RegisterSaver::restore_live_registers(masm); |
| |
| __ far_jump(RuntimeAddress(StubRoutines::forward_exception_entry())); |
| |
| // No exception case |
| __ bind(noException); |
| |
| // Normal exit, restore registers and exit. |
| RegisterSaver::restore_live_registers(masm, save_vectors); |
| |
| __ ret(lr); |
| |
| // Make sure all code is generated |
| masm->flush(); |
| |
| // Fill-out other meta info |
| return SafepointBlob::create(&buffer, oop_maps, frame_size_in_words); |
| } |
| |
| // |
| // generate_resolve_blob - call resolution (static/virtual/opt-virtual/ic-miss |
| // |
| // Generate a stub that calls into vm to find out the proper destination |
| // of a java call. All the argument registers are live at this point |
| // but since this is generic code we don't know what they are and the caller |
| // must do any gc of the args. |
| // |
| RuntimeStub* SharedRuntime::generate_resolve_blob(address destination, const char* name) { |
| assert (StubRoutines::forward_exception_entry() != NULL, "must be generated before"); |
| |
| // allocate space for the code |
| ResourceMark rm; |
| |
| CodeBuffer buffer(name, 1000, 512); |
| MacroAssembler* masm = new MacroAssembler(&buffer); |
| |
| int frame_size_in_words; |
| |
| OopMapSet *oop_maps = new OopMapSet(); |
| OopMap* map = NULL; |
| |
| int start = __ offset(); |
| |
| map = RegisterSaver::save_live_registers(masm, 0, &frame_size_in_words); |
| |
| int frame_complete = __ offset(); |
| |
| { |
| Label retaddr; |
| __ set_last_Java_frame(sp, noreg, retaddr, rscratch1); |
| |
| __ mov(c_rarg0, rthread); |
| __ lea(rscratch1, RuntimeAddress(destination)); |
| |
| __ blrt(rscratch1, 1, 0, 1); |
| __ bind(retaddr); |
| } |
| |
| // Set an oopmap for the call site. |
| // We need this not only for callee-saved registers, but also for volatile |
| // registers that the compiler might be keeping live across a safepoint. |
| |
| oop_maps->add_gc_map( __ offset() - start, map); |
| |
| __ maybe_isb(); |
| |
| // r0 contains the address we are going to jump to assuming no exception got installed |
| |
| // clear last_Java_sp |
| __ reset_last_Java_frame(false, true); |
| // check for pending exceptions |
| Label pending; |
| __ ldr(rscratch1, Address(rthread, Thread::pending_exception_offset())); |
| __ cbnz(rscratch1, pending); |
| |
| // get the returned Method* |
| __ get_vm_result_2(rmethod, rthread); |
| __ str(rmethod, Address(sp, RegisterSaver::reg_offset_in_bytes(rmethod))); |
| |
| // r0 is where we want to jump, overwrite rscratch1 which is saved and scratch |
| __ str(r0, Address(sp, RegisterSaver::rscratch1_offset_in_bytes())); |
| RegisterSaver::restore_live_registers(masm); |
| |
| // We are back the the original state on entry and ready to go. |
| |
| __ br(rscratch1); |
| |
| // Pending exception after the safepoint |
| |
| __ bind(pending); |
| |
| RegisterSaver::restore_live_registers(masm); |
| |
| // exception pending => remove activation and forward to exception handler |
| |
| __ str(zr, Address(rthread, JavaThread::vm_result_offset())); |
| |
| __ ldr(r0, Address(rthread, Thread::pending_exception_offset())); |
| __ far_jump(RuntimeAddress(StubRoutines::forward_exception_entry())); |
| |
| // ------------- |
| // make sure all code is generated |
| masm->flush(); |
| |
| // return the blob |
| // frame_size_words or bytes?? |
| return RuntimeStub::new_runtime_stub(name, &buffer, frame_complete, frame_size_in_words, oop_maps, true); |
| } |
| |
| |
| #if defined(COMPILER2) || INCLUDE_JVMCI |
| // This is here instead of runtime_x86_64.cpp because it uses SimpleRuntimeFrame |
| // |
| //------------------------------generate_exception_blob--------------------------- |
| // creates exception blob at the end |
| // Using exception blob, this code is jumped from a compiled method. |
| // (see emit_exception_handler in x86_64.ad file) |
| // |
| // Given an exception pc at a call we call into the runtime for the |
| // handler in this method. This handler might merely restore state |
| // (i.e. callee save registers) unwind the frame and jump to the |
| // exception handler for the nmethod if there is no Java level handler |
| // for the nmethod. |
| // |
| // This code is entered with a jmp. |
| // |
| // Arguments: |
| // r0: exception oop |
| // r3: exception pc |
| // |
| // Results: |
| // r0: exception oop |
| // r3: exception pc in caller or ??? |
| // destination: exception handler of caller |
| // |
| // Note: the exception pc MUST be at a call (precise debug information) |
| // Registers r0, r3, r2, r4, r5, r8-r11 are not callee saved. |
| // |
| |
| void OptoRuntime::generate_exception_blob() { |
| assert(!OptoRuntime::is_callee_saved_register(R3_num), ""); |
| assert(!OptoRuntime::is_callee_saved_register(R0_num), ""); |
| assert(!OptoRuntime::is_callee_saved_register(R2_num), ""); |
| |
| assert(SimpleRuntimeFrame::framesize % 4 == 0, "sp not 16-byte aligned"); |
| |
| // Allocate space for the code |
| ResourceMark rm; |
| // Setup code generation tools |
| CodeBuffer buffer("exception_blob", 2048, 1024); |
| MacroAssembler* masm = new MacroAssembler(&buffer); |
| |
| // TODO check various assumptions made here |
| // |
| // make sure we do so before running this |
| |
| address start = __ pc(); |
| |
| // push rfp and retaddr by hand |
| // Exception pc is 'return address' for stack walker |
| __ stp(rfp, lr, Address(__ pre(sp, -2 * wordSize))); |
| // there are no callee save registers and we don't expect an |
| // arg reg save area |
| #ifndef PRODUCT |
| assert(frame::arg_reg_save_area_bytes == 0, "not expecting frame reg save area"); |
| #endif |
| // Store exception in Thread object. We cannot pass any arguments to the |
| // handle_exception call, since we do not want to make any assumption |
| // about the size of the frame where the exception happened in. |
| __ str(r0, Address(rthread, JavaThread::exception_oop_offset())); |
| __ str(r3, Address(rthread, JavaThread::exception_pc_offset())); |
| |
| // This call does all the hard work. It checks if an exception handler |
| // exists in the method. |
| // If so, it returns the handler address. |
| // If not, it prepares for stack-unwinding, restoring the callee-save |
| // registers of the frame being removed. |
| // |
| // address OptoRuntime::handle_exception_C(JavaThread* thread) |
| // |
| // n.b. 1 gp arg, 0 fp args, integral return type |
| |
| // the stack should always be aligned |
| address the_pc = __ pc(); |
| __ set_last_Java_frame(sp, noreg, the_pc, rscratch1); |
| __ mov(c_rarg0, rthread); |
| __ lea(rscratch1, RuntimeAddress(CAST_FROM_FN_PTR(address, OptoRuntime::handle_exception_C))); |
| __ blrt(rscratch1, 1, 0, MacroAssembler::ret_type_integral); |
| __ maybe_isb(); |
| |
| // Set an oopmap for the call site. This oopmap will only be used if we |
| // are unwinding the stack. Hence, all locations will be dead. |
| // Callee-saved registers will be the same as the frame above (i.e., |
| // handle_exception_stub), since they were restored when we got the |
| // exception. |
| |
| OopMapSet* oop_maps = new OopMapSet(); |
| |
| oop_maps->add_gc_map(the_pc - start, new OopMap(SimpleRuntimeFrame::framesize, 0)); |
| |
| __ reset_last_Java_frame(false, true); |
| |
| // Restore callee-saved registers |
| |
| // rfp is an implicitly saved callee saved register (i.e. the calling |
| // convention will save restore it in prolog/epilog) Other than that |
| // there are no callee save registers now that adapter frames are gone. |
| // and we dont' expect an arg reg save area |
| __ ldp(rfp, r3, Address(__ post(sp, 2 * wordSize))); |
| |
| // r0: exception handler |
| |
| // We have a handler in r0 (could be deopt blob). |
| __ mov(r8, r0); |
| |
| // Get the exception oop |
| __ ldr(r0, Address(rthread, JavaThread::exception_oop_offset())); |
| // Get the exception pc in case we are deoptimized |
| __ ldr(r4, Address(rthread, JavaThread::exception_pc_offset())); |
| #ifdef ASSERT |
| __ str(zr, Address(rthread, JavaThread::exception_handler_pc_offset())); |
| __ str(zr, Address(rthread, JavaThread::exception_pc_offset())); |
| #endif |
| // Clear the exception oop so GC no longer processes it as a root. |
| __ str(zr, Address(rthread, JavaThread::exception_oop_offset())); |
| |
| // r0: exception oop |
| // r8: exception handler |
| // r4: exception pc |
| // Jump to handler |
| |
| __ br(r8); |
| |
| // Make sure all code is generated |
| masm->flush(); |
| |
| // Set exception blob |
| _exception_blob = ExceptionBlob::create(&buffer, oop_maps, SimpleRuntimeFrame::framesize >> 1); |
| } |
| #endif // COMPILER2 |