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annotate src/share/vm/asm/assembler.hpp @ 2244:4f26f535a225
6354181: nsk.logging.stress.threads.scmhml001 fails assertion in "src/share/vm/oops/instanceKlass.cpp, 111"
Reviewed-by: jrose, acorn
author | never |
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date | Mon, 31 Jan 2011 17:48:21 -0800 |
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0 | 1 /* |
1972 | 2 * Copyright (c) 1997, 2010, Oracle and/or its affiliates. All rights reserved. |
0 | 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 * | |
1552
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19 * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA |
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20 * or visit www.oracle.com if you need additional information or have any |
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21 * questions. |
0 | 22 * |
23 */ | |
24 | |
1972 | 25 #ifndef SHARE_VM_ASM_ASSEMBLER_HPP |
26 #define SHARE_VM_ASM_ASSEMBLER_HPP | |
27 | |
28 #include "code/oopRecorder.hpp" | |
29 #include "code/relocInfo.hpp" | |
30 #include "memory/allocation.hpp" | |
31 #include "utilities/debug.hpp" | |
32 #include "utilities/growableArray.hpp" | |
33 #include "utilities/top.hpp" | |
34 #ifdef TARGET_ARCH_x86 | |
35 # include "register_x86.hpp" | |
36 # include "vm_version_x86.hpp" | |
37 #endif | |
38 #ifdef TARGET_ARCH_sparc | |
39 # include "register_sparc.hpp" | |
40 # include "vm_version_sparc.hpp" | |
41 #endif | |
42 #ifdef TARGET_ARCH_zero | |
43 # include "register_zero.hpp" | |
44 # include "vm_version_zero.hpp" | |
45 #endif | |
46 | |
605 | 47 // This file contains platform-independent assembler declarations. |
0 | 48 |
49 class CodeBuffer; | |
50 class MacroAssembler; | |
51 class AbstractAssembler; | |
52 class Label; | |
53 | |
54 /** | |
55 * Labels represent destinations for control transfer instructions. Such | |
56 * instructions can accept a Label as their target argument. A Label is | |
57 * bound to the current location in the code stream by calling the | |
58 * MacroAssembler's 'bind' method, which in turn calls the Label's 'bind' | |
59 * method. A Label may be referenced by an instruction before it's bound | |
60 * (i.e., 'forward referenced'). 'bind' stores the current code offset | |
61 * in the Label object. | |
62 * | |
63 * If an instruction references a bound Label, the offset field(s) within | |
64 * the instruction are immediately filled in based on the Label's code | |
65 * offset. If an instruction references an unbound label, that | |
66 * instruction is put on a list of instructions that must be patched | |
67 * (i.e., 'resolved') when the Label is bound. | |
68 * | |
69 * 'bind' will call the platform-specific 'patch_instruction' method to | |
70 * fill in the offset field(s) for each unresolved instruction (if there | |
71 * are any). 'patch_instruction' lives in one of the | |
72 * cpu/<arch>/vm/assembler_<arch>* files. | |
73 * | |
74 * Instead of using a linked list of unresolved instructions, a Label has | |
75 * an array of unresolved instruction code offsets. _patch_index | |
76 * contains the total number of forward references. If the Label's array | |
77 * overflows (i.e., _patch_index grows larger than the array size), a | |
78 * GrowableArray is allocated to hold the remaining offsets. (The cache | |
79 * size is 4 for now, which handles over 99.5% of the cases) | |
80 * | |
81 * Labels may only be used within a single CodeSection. If you need | |
82 * to create references between code sections, use explicit relocations. | |
83 */ | |
84 class Label VALUE_OBJ_CLASS_SPEC { | |
85 private: | |
86 enum { PatchCacheSize = 4 }; | |
87 | |
88 // _loc encodes both the binding state (via its sign) | |
89 // and the binding locator (via its value) of a label. | |
90 // | |
91 // _loc >= 0 bound label, loc() encodes the target (jump) position | |
92 // _loc == -1 unbound label | |
93 int _loc; | |
94 | |
95 // References to instructions that jump to this unresolved label. | |
96 // These instructions need to be patched when the label is bound | |
97 // using the platform-specific patchInstruction() method. | |
98 // | |
99 // To avoid having to allocate from the C-heap each time, we provide | |
100 // a local cache and use the overflow only if we exceed the local cache | |
101 int _patches[PatchCacheSize]; | |
102 int _patch_index; | |
103 GrowableArray<int>* _patch_overflow; | |
104 | |
105 Label(const Label&) { ShouldNotReachHere(); } | |
106 | |
107 public: | |
108 | |
109 /** | |
110 * After binding, be sure 'patch_instructions' is called later to link | |
111 */ | |
112 void bind_loc(int loc) { | |
113 assert(loc >= 0, "illegal locator"); | |
114 assert(_loc == -1, "already bound"); | |
115 _loc = loc; | |
116 } | |
117 void bind_loc(int pos, int sect); // = bind_loc(locator(pos, sect)) | |
118 | |
119 #ifndef PRODUCT | |
120 // Iterates over all unresolved instructions for printing | |
121 void print_instructions(MacroAssembler* masm) const; | |
122 #endif // PRODUCT | |
123 | |
124 /** | |
125 * Returns the position of the the Label in the code buffer | |
126 * The position is a 'locator', which encodes both offset and section. | |
127 */ | |
128 int loc() const { | |
129 assert(_loc >= 0, "unbound label"); | |
130 return _loc; | |
131 } | |
132 int loc_pos() const; // == locator_pos(loc()) | |
133 int loc_sect() const; // == locator_sect(loc()) | |
134 | |
135 bool is_bound() const { return _loc >= 0; } | |
136 bool is_unbound() const { return _loc == -1 && _patch_index > 0; } | |
137 bool is_unused() const { return _loc == -1 && _patch_index == 0; } | |
138 | |
139 /** | |
140 * Adds a reference to an unresolved displacement instruction to | |
141 * this unbound label | |
142 * | |
143 * @param cb the code buffer being patched | |
144 * @param branch_loc the locator of the branch instruction in the code buffer | |
145 */ | |
146 void add_patch_at(CodeBuffer* cb, int branch_loc); | |
147 | |
148 /** | |
149 * Iterate over the list of patches, resolving the instructions | |
150 * Call patch_instruction on each 'branch_loc' value | |
151 */ | |
152 void patch_instructions(MacroAssembler* masm); | |
153 | |
154 void init() { | |
155 _loc = -1; | |
156 _patch_index = 0; | |
157 _patch_overflow = NULL; | |
158 } | |
159 | |
160 Label() { | |
161 init(); | |
162 } | |
163 }; | |
164 | |
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165 // A union type for code which has to assemble both constant and |
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166 // non-constant operands, when the distinction cannot be made |
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167 // statically. |
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168 class RegisterOrConstant VALUE_OBJ_CLASS_SPEC { |
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169 private: |
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170 Register _r; |
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171 intptr_t _c; |
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172 |
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173 public: |
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174 RegisterOrConstant(): _r(noreg), _c(0) {} |
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175 RegisterOrConstant(Register r): _r(r), _c(0) {} |
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176 RegisterOrConstant(intptr_t c): _r(noreg), _c(c) {} |
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177 |
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178 Register as_register() const { assert(is_register(),""); return _r; } |
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179 intptr_t as_constant() const { assert(is_constant(),""); return _c; } |
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180 |
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181 Register register_or_noreg() const { return _r; } |
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182 intptr_t constant_or_zero() const { return _c; } |
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183 |
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184 bool is_register() const { return _r != noreg; } |
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185 bool is_constant() const { return _r == noreg; } |
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186 }; |
0 | 187 |
188 // The Abstract Assembler: Pure assembler doing NO optimizations on the | |
189 // instruction level; i.e., what you write is what you get. | |
190 // The Assembler is generating code into a CodeBuffer. | |
191 class AbstractAssembler : public ResourceObj { | |
192 friend class Label; | |
193 | |
194 protected: | |
195 CodeSection* _code_section; // section within the code buffer | |
196 address _code_begin; // first byte of code buffer | |
197 address _code_limit; // first byte after code buffer | |
198 address _code_pos; // current code generation position | |
199 OopRecorder* _oop_recorder; // support for relocInfo::oop_type | |
200 | |
201 // Code emission & accessing | |
202 address addr_at(int pos) const { return _code_begin + pos; } | |
203 | |
204 // This routine is called with a label is used for an address. | |
205 // Labels and displacements truck in offsets, but target must return a PC. | |
206 address target(Label& L); // return _code_section->target(L) | |
207 | |
208 bool is8bit(int x) const { return -0x80 <= x && x < 0x80; } | |
209 bool isByte(int x) const { return 0 <= x && x < 0x100; } | |
210 bool isShiftCount(int x) const { return 0 <= x && x < 32; } | |
211 | |
212 void emit_byte(int x); // emit a single byte | |
213 void emit_word(int x); // emit a 16-bit word (not a wordSize word!) | |
214 void emit_long(jint x); // emit a 32-bit word (not a longSize word!) | |
215 void emit_address(address x); // emit an address (not a longSize word!) | |
216 | |
217 // Instruction boundaries (required when emitting relocatable values). | |
218 class InstructionMark: public StackObj { | |
219 private: | |
220 AbstractAssembler* _assm; | |
221 | |
222 public: | |
223 InstructionMark(AbstractAssembler* assm) : _assm(assm) { | |
224 assert(assm->inst_mark() == NULL, "overlapping instructions"); | |
225 _assm->set_inst_mark(); | |
226 } | |
227 ~InstructionMark() { | |
228 _assm->clear_inst_mark(); | |
229 } | |
230 }; | |
231 friend class InstructionMark; | |
232 #ifdef ASSERT | |
233 // Make it return true on platforms which need to verify | |
234 // instruction boundaries for some operations. | |
235 inline static bool pd_check_instruction_mark(); | |
236 #endif | |
237 | |
238 // Label functions | |
239 void print(Label& L); | |
240 | |
241 public: | |
242 | |
243 // Creation | |
244 AbstractAssembler(CodeBuffer* code); | |
245 | |
246 // save end pointer back to code buf. | |
247 void sync(); | |
248 | |
249 // ensure buf contains all code (call this before using/copying the code) | |
250 void flush(); | |
251 | |
252 // Accessors | |
253 CodeBuffer* code() const; // _code_section->outer() | |
254 CodeSection* code_section() const { return _code_section; } | |
255 int sect() const; // return _code_section->index() | |
256 address pc() const { return _code_pos; } | |
257 int offset() const { return _code_pos - _code_begin; } | |
258 int locator() const; // CodeBuffer::locator(offset(), sect()) | |
259 OopRecorder* oop_recorder() const { return _oop_recorder; } | |
260 void set_oop_recorder(OopRecorder* r) { _oop_recorder = r; } | |
261 | |
262 address inst_mark() const; | |
263 void set_inst_mark(); | |
264 void clear_inst_mark(); | |
265 | |
266 // Constants in code | |
267 void a_byte(int x); | |
268 void a_long(jint x); | |
269 void relocate(RelocationHolder const& rspec, int format = 0); | |
270 void relocate( relocInfo::relocType rtype, int format = 0) { | |
271 if (rtype != relocInfo::none) | |
272 relocate(Relocation::spec_simple(rtype), format); | |
273 } | |
274 | |
275 static int code_fill_byte(); // used to pad out odd-sized code buffers | |
276 | |
277 // Associate a comment with the current offset. It will be printed | |
278 // along with the disassembly when printing nmethods. Currently | |
279 // only supported in the instruction section of the code buffer. | |
280 void block_comment(const char* comment); | |
281 | |
282 // Label functions | |
283 void bind(Label& L); // binds an unbound label L to the current code position | |
284 | |
285 // Move to a different section in the same code buffer. | |
286 void set_code_section(CodeSection* cs); | |
287 | |
288 // Inform assembler when generating stub code and relocation info | |
289 address start_a_stub(int required_space); | |
290 void end_a_stub(); | |
291 // Ditto for constants. | |
292 address start_a_const(int required_space, int required_align = sizeof(double)); | |
293 void end_a_const(); | |
294 | |
2008 | 295 // constants support |
296 address long_constant(jlong c) { | |
297 address ptr = start_a_const(sizeof(c), sizeof(c)); | |
298 if (ptr != NULL) { | |
299 *(jlong*)ptr = c; | |
300 _code_pos = ptr + sizeof(c); | |
301 end_a_const(); | |
302 } | |
303 return ptr; | |
304 } | |
0 | 305 address double_constant(jdouble c) { |
306 address ptr = start_a_const(sizeof(c), sizeof(c)); | |
307 if (ptr != NULL) { | |
308 *(jdouble*)ptr = c; | |
309 _code_pos = ptr + sizeof(c); | |
310 end_a_const(); | |
311 } | |
312 return ptr; | |
313 } | |
314 address float_constant(jfloat c) { | |
315 address ptr = start_a_const(sizeof(c), sizeof(c)); | |
316 if (ptr != NULL) { | |
317 *(jfloat*)ptr = c; | |
318 _code_pos = ptr + sizeof(c); | |
319 end_a_const(); | |
320 } | |
321 return ptr; | |
322 } | |
2008 | 323 address address_constant(address c) { |
324 address ptr = start_a_const(sizeof(c), sizeof(c)); | |
325 if (ptr != NULL) { | |
326 *(address*)ptr = c; | |
327 _code_pos = ptr + sizeof(c); | |
328 end_a_const(); | |
329 } | |
330 return ptr; | |
331 } | |
0 | 332 address address_constant(address c, RelocationHolder const& rspec) { |
333 address ptr = start_a_const(sizeof(c), sizeof(c)); | |
334 if (ptr != NULL) { | |
335 relocate(rspec); | |
336 *(address*)ptr = c; | |
337 _code_pos = ptr + sizeof(c); | |
338 end_a_const(); | |
339 } | |
340 return ptr; | |
341 } | |
342 | |
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343 // Bootstrapping aid to cope with delayed determination of constants. |
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344 // Returns a static address which will eventually contain the constant. |
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345 // The value zero (NULL) stands instead of a constant which is still uncomputed. |
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346 // Thus, the eventual value of the constant must not be zero. |
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347 // This is fine, since this is designed for embedding object field |
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348 // offsets in code which must be generated before the object class is loaded. |
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349 // Field offsets are never zero, since an object's header (mark word) |
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350 // is located at offset zero. |
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351 RegisterOrConstant delayed_value(int(*value_fn)(), Register tmp, int offset = 0) { |
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352 return delayed_value_impl(delayed_value_addr(value_fn), tmp, offset); |
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353 } |
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354 RegisterOrConstant delayed_value(address(*value_fn)(), Register tmp, int offset = 0) { |
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355 return delayed_value_impl(delayed_value_addr(value_fn), tmp, offset); |
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356 } |
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357 virtual RegisterOrConstant delayed_value_impl(intptr_t* delayed_value_addr, Register tmp, int offset) = 0; |
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358 // Last overloading is platform-dependent; look in assembler_<arch>.cpp. |
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359 static intptr_t* delayed_value_addr(int(*constant_fn)()); |
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360 static intptr_t* delayed_value_addr(address(*constant_fn)()); |
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361 static void update_delayed_values(); |
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362 |
0 | 363 // Bang stack to trigger StackOverflowError at a safe location |
364 // implementation delegates to machine-specific bang_stack_with_offset | |
365 void generate_stack_overflow_check( int frame_size_in_bytes ); | |
366 virtual void bang_stack_with_offset(int offset) = 0; | |
367 | |
368 | |
369 /** | |
370 * A platform-dependent method to patch a jump instruction that refers | |
371 * to this label. | |
372 * | |
373 * @param branch the location of the instruction to patch | |
374 * @param masm the assembler which generated the branch | |
375 */ | |
376 void pd_patch_instruction(address branch, address target); | |
377 | |
378 #ifndef PRODUCT | |
379 /** | |
380 * Platform-dependent method of printing an instruction that needs to be | |
381 * patched. | |
382 * | |
383 * @param branch the instruction to be patched in the buffer. | |
384 */ | |
385 static void pd_print_patched_instruction(address branch); | |
386 #endif // PRODUCT | |
387 }; | |
388 | |
1972 | 389 #ifdef TARGET_ARCH_x86 |
390 # include "assembler_x86.hpp" | |
391 #endif | |
392 #ifdef TARGET_ARCH_sparc | |
393 # include "assembler_sparc.hpp" | |
394 #endif | |
395 #ifdef TARGET_ARCH_zero | |
396 # include "assembler_zero.hpp" | |
397 #endif | |
398 | |
399 | |
400 #endif // SHARE_VM_ASM_ASSEMBLER_HPP |