1 /*
2 * Copyright (c) 2000, 2025, Oracle and/or its affiliates. All rights reserved.
3 * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
4 *
5 * This code is free software; you can redistribute it and/or modify it
6 * under the terms of the GNU General Public License version 2 only, as
7 * published by the Free Software Foundation.
8 *
9 * This code is distributed in the hope that it will be useful, but WITHOUT
10 * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
11 * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License
12 * version 2 for more details (a copy is included in the LICENSE file that
13 * accompanied this code).
14 *
15 * You should have received a copy of the GNU General Public License version
16 * 2 along with this work; if not, write to the Free Software Foundation,
17 * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
18 *
19 * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA
20 * or visit www.oracle.com if you need additional information or have any
21 * questions.
22 *
23 */
24
25 #ifndef SHARE_C1_C1_FRAMEMAP_HPP
26 #define SHARE_C1_C1_FRAMEMAP_HPP
27
28 #include "c1/c1_Defs.hpp"
29 #include "c1/c1_LIR.hpp"
30 #include "code/vmreg.hpp"
31 #include "memory/allocation.hpp"
32 #include "oops/compressedOops.hpp"
33 #include "runtime/frame.hpp"
34 #include "utilities/globalDefinitions.hpp"
35 #include "utilities/macros.hpp"
36
37 class ciMethod;
38 class CallingConvention;
39
40 //--------------------------------------------------------
41 // FrameMap
42 //--------------------------------------------------------
43
44 // This class is responsible of mapping items (locals, monitors, spill
45 // slots and registers) to their frame location
46 //
47 // The monitors are specified by a consecutive index, although each monitor entry
48 // occupies two words. The monitor_index is 0.._num_monitors
49 // The spill index is similar to local index; it is in range 0..(open)
50 //
51 // The CPU registers are mapped using a fixed table; register with number 0
52 // is the most used one.
53
54
55 // stack grow direction --> SP
56 // +----------+---+----------+-------+------------------------+-----+
57 // |arguments | x | monitors | spill | reserved argument area | ABI |
58 // +----------+---+----------+-------+------------------------+-----+
59 //
60 // x = ABI area (SPARC) or return address and link (i486)
61 // ABI = ABI area (SPARC) or nothing (i486)
62
63
64 class FrameMap : public CompilationResourceObj {
65 public:
66 enum {
67 nof_cpu_regs = pd_nof_cpu_regs_frame_map,
68 nof_fpu_regs = pd_nof_fpu_regs_frame_map,
69
70 nof_cpu_regs_reg_alloc = pd_nof_cpu_regs_reg_alloc,
71 nof_fpu_regs_reg_alloc = pd_nof_fpu_regs_reg_alloc,
72
73 max_nof_caller_save_cpu_regs = pd_nof_caller_save_cpu_regs_frame_map,
74 nof_caller_save_fpu_regs = pd_nof_caller_save_fpu_regs_frame_map,
75
76 spill_slot_size_in_bytes = 4
77 };
78
79 void update_reserved_argument_area_size (int size) {
80 assert(size >= 0, "check");
81 _reserved_argument_area_size = MAX2(_reserved_argument_area_size, size);
82 }
83
84 #include CPU_HEADER(c1_FrameMap)
85
86 friend class LIR_Opr;
87
88 private:
89 static bool _init_done;
90 static Register _cpu_rnr2reg [nof_cpu_regs];
91 static int _cpu_reg2rnr [nof_cpu_regs];
92
93 static LIR_Opr _caller_save_cpu_regs [max_nof_caller_save_cpu_regs];
94 static LIR_Opr _caller_save_fpu_regs [nof_caller_save_fpu_regs];
95
96 int _framesize;
97 int _argcount;
98 int _num_monitors;
99 int _num_spills;
100 int _reserved_argument_area_size;
101 int _oop_map_arg_count;
102
103 CallingConvention* _incoming_arguments;
104 intArray* _argument_locations;
105
106 void check_spill_index (int spill_index) const { assert(spill_index >= 0, "bad index"); }
107 void check_monitor_index (int monitor_index) const { assert(monitor_index >= 0 &&
108 monitor_index < _num_monitors, "bad index"); }
109
110 static Register cpu_rnr2reg (int rnr) {
111 assert(_init_done, "tables not initialized");
112 debug_only(cpu_range_check(rnr);)
113 return _cpu_rnr2reg[rnr];
114 }
115
116 static int cpu_reg2rnr (Register reg) {
117 assert(_init_done, "tables not initialized");
118 debug_only(cpu_range_check(reg->encoding());)
119 return _cpu_reg2rnr[reg->encoding()];
120 }
121
122 static void map_register(int rnr, Register reg) {
123 debug_only(cpu_range_check(rnr);)
124 debug_only(cpu_range_check(reg->encoding());)
125 _cpu_rnr2reg[rnr] = reg;
126 _cpu_reg2rnr[reg->encoding()] = rnr;
127 }
128
129 protected:
130 #ifndef PRODUCT
131 static void cpu_range_check (int rnr) { assert(0 <= rnr && rnr < nof_cpu_regs, "cpu register number is too big"); }
132 static void fpu_range_check (int rnr) { assert(0 <= rnr && rnr < nof_fpu_regs, "fpu register number is too big"); }
133 #endif
134
135 ByteSize sp_offset_for_monitor_base(const int idx) const;
136
137 Address make_new_address(ByteSize sp_offset) const;
138
139 ByteSize sp_offset_for_slot(const int idx) const;
140 ByteSize sp_offset_for_double_slot(const int idx) const;
141 ByteSize sp_offset_for_spill(const int idx) const;
142 ByteSize sp_offset_for_monitor_lock(int monitor_index) const;
143 ByteSize sp_offset_for_monitor_object(int monitor_index) const;
144
145 VMReg sp_offset2vmreg(ByteSize offset) const;
146
147 // platform dependent hook used to check that frame is properly
148 // addressable on the platform. Used by arm, ppc to verify that all
149 // stack addresses are valid.
150 bool validate_frame();
151
152 static LIR_Opr map_to_opr(BasicType type, VMRegPair* reg, bool incoming);
153
154 public:
155 // Opr representing the stack_pointer on this platform
156 static LIR_Opr stack_pointer();
157
158 // JSR 292
159 static LIR_Opr method_handle_invoke_SP_save_opr();
160
161 static BasicTypeArray* signature_type_array_for(const ciMethod* method);
162
163 // for outgoing calls, these also update the reserved area to
164 // include space for arguments and any ABI area.
165 CallingConvention* c_calling_convention(const BasicTypeArray* signature);
166 CallingConvention* java_calling_convention(const BasicTypeArray* signature, bool outgoing);
167
168 // deopt support
169 ByteSize sp_offset_for_orig_pc() { return sp_offset_for_monitor_base(_num_monitors); }
170
171 static LIR_Opr as_opr(Register r) {
172 return LIR_OprFact::single_cpu(cpu_reg2rnr(r));
173 }
174 static LIR_Opr as_oop_opr(Register r) {
175 return LIR_OprFact::single_cpu_oop(cpu_reg2rnr(r));
176 }
177
178 static LIR_Opr as_metadata_opr(Register r) {
179 return LIR_OprFact::single_cpu_metadata(cpu_reg2rnr(r));
180 }
181
182 static LIR_Opr as_address_opr(Register r) {
183 return LIR_OprFact::single_cpu_address(cpu_reg2rnr(r));
184 }
185
186 FrameMap(ciMethod* method, int monitors, int reserved_argument_area_size);
187 bool finalize_frame(int nof_slots);
188
189 int reserved_argument_area_size () const { return _reserved_argument_area_size; }
190 int framesize () const { assert(_framesize != -1, "hasn't been calculated"); return _framesize; }
191 ByteSize framesize_in_bytes () const { return in_ByteSize(framesize() * 4); }
192 int num_monitors () const { return _num_monitors; }
193 int num_spills () const { assert(_num_spills >= 0, "not set"); return _num_spills; }
194 int argcount () const { assert(_argcount >= 0, "not set"); return _argcount; }
195
196 int oop_map_arg_count() const { return _oop_map_arg_count; }
197
198 CallingConvention* incoming_arguments() const { return _incoming_arguments; }
199
200 // convenience routines
201 Address address_for_slot(int index, int sp_adjust = 0) const {
202 return make_new_address(sp_offset_for_slot(index) + in_ByteSize(sp_adjust));
203 }
204 Address address_for_double_slot(int index, int sp_adjust = 0) const {
205 return make_new_address(sp_offset_for_double_slot(index) + in_ByteSize(sp_adjust));
206 }
207 Address address_for_monitor_lock(int monitor_index) const {
208 return make_new_address(sp_offset_for_monitor_lock(monitor_index));
209 }
210 Address address_for_monitor_object(int monitor_index) const {
211 return make_new_address(sp_offset_for_monitor_object(monitor_index));
212 }
213
214 // Creates Location describing desired slot and returns it via pointer
215 // to Location object. Returns true if the stack frame offset was legal
216 // (as defined by Location::legal_offset_in_bytes()), false otherwise.
217 // Do not use the returned location if this returns false.
218 bool location_for_sp_offset(ByteSize byte_offset_from_sp,
219 Location::Type loc_type, Location* loc) const;
220
221 bool location_for_monitor_lock (int monitor_index, Location* loc) const {
222 return location_for_sp_offset(sp_offset_for_monitor_lock(monitor_index), Location::normal, loc);
223 }
224 bool location_for_monitor_object(int monitor_index, Location* loc) const {
225 return location_for_sp_offset(sp_offset_for_monitor_object(monitor_index), Location::oop, loc);
226 }
227 bool locations_for_slot (int index, Location::Type loc_type,
228 Location* loc, Location* second = nullptr) const;
229
230 VMReg slot_regname(int index) const {
231 return sp_offset2vmreg(sp_offset_for_slot(index));
232 }
233 VMReg monitor_object_regname(int monitor_index) const {
234 return sp_offset2vmreg(sp_offset_for_monitor_object(monitor_index));
235 }
236 VMReg regname(LIR_Opr opr) const;
237
238 static LIR_Opr caller_save_cpu_reg_at(int i) {
239 assert(i >= 0 && i < max_nof_caller_save_cpu_regs, "out of bounds");
240 return _caller_save_cpu_regs[i];
241 }
242
243 static LIR_Opr caller_save_fpu_reg_at(int i) {
244 assert(i >= 0 && i < nof_caller_save_fpu_regs, "out of bounds");
245 return _caller_save_fpu_regs[i];
246 }
247
248 static void initialize();
249 };
250
251 // CallingConvention
252 //--------------------------------------------------------
253
254 class CallingConvention: public ResourceObj {
255 private:
256 LIR_OprList* _args;
257 int _reserved_stack_slots;
258
259 public:
260 CallingConvention (LIR_OprList* args, int reserved_stack_slots)
261 : _args(args)
262 , _reserved_stack_slots(reserved_stack_slots) {}
263
264 LIR_OprList* args() { return _args; }
265
266 LIR_Opr at(int i) const { return _args->at(i); }
267 int length() const { return _args->length(); }
268
269 // Indicates number of real frame slots used by arguments passed on stack.
270 int reserved_stack_slots() const { return _reserved_stack_slots; }
271
272 #ifndef PRODUCT
273 void print () const {
274 for (int i = 0; i < length(); i++) {
275 at(i)->print();
276 }
277 }
278 #endif // PRODUCT
279 };
280
281 #endif // SHARE_C1_C1_FRAMEMAP_HPP