Mercurial > hg > truffle
annotate src/share/vm/asm/assembler.hpp @ 7666:31540ca73e81
Remove ControlFlowException in SimpleLanguage.
author | Thomas Wuerthinger <thomas.wuerthinger@oracle.com> |
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date | Fri, 01 Feb 2013 19:53:52 +0100 |
parents | ffa87474d7a4 |
children | a5de0cc2f91c |
rev | line source |
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0 | 1 /* |
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2 * Copyright (c) 1997, 2012, 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 * | |
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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 | |
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28 #include "asm/codeBuffer.hpp" |
1972 | 29 #include "code/oopRecorder.hpp" |
30 #include "code/relocInfo.hpp" | |
31 #include "memory/allocation.hpp" | |
32 #include "utilities/debug.hpp" | |
33 #include "utilities/growableArray.hpp" | |
34 #include "utilities/top.hpp" | |
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35 |
1972 | 36 #ifdef TARGET_ARCH_x86 |
37 # include "register_x86.hpp" | |
38 # include "vm_version_x86.hpp" | |
39 #endif | |
40 #ifdef TARGET_ARCH_sparc | |
41 # include "register_sparc.hpp" | |
42 # include "vm_version_sparc.hpp" | |
43 #endif | |
44 #ifdef TARGET_ARCH_zero | |
45 # include "register_zero.hpp" | |
46 # include "vm_version_zero.hpp" | |
47 #endif | |
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48 #ifdef TARGET_ARCH_arm |
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49 # include "register_arm.hpp" |
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50 # include "vm_version_arm.hpp" |
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51 #endif |
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52 #ifdef TARGET_ARCH_ppc |
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53 # include "register_ppc.hpp" |
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54 # include "vm_version_ppc.hpp" |
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55 #endif |
1972 | 56 |
605 | 57 // This file contains platform-independent assembler declarations. |
0 | 58 |
59 class MacroAssembler; | |
60 class AbstractAssembler; | |
61 class Label; | |
62 | |
63 /** | |
64 * Labels represent destinations for control transfer instructions. Such | |
65 * instructions can accept a Label as their target argument. A Label is | |
66 * bound to the current location in the code stream by calling the | |
67 * MacroAssembler's 'bind' method, which in turn calls the Label's 'bind' | |
68 * method. A Label may be referenced by an instruction before it's bound | |
69 * (i.e., 'forward referenced'). 'bind' stores the current code offset | |
70 * in the Label object. | |
71 * | |
72 * If an instruction references a bound Label, the offset field(s) within | |
73 * the instruction are immediately filled in based on the Label's code | |
74 * offset. If an instruction references an unbound label, that | |
75 * instruction is put on a list of instructions that must be patched | |
76 * (i.e., 'resolved') when the Label is bound. | |
77 * | |
78 * 'bind' will call the platform-specific 'patch_instruction' method to | |
79 * fill in the offset field(s) for each unresolved instruction (if there | |
80 * are any). 'patch_instruction' lives in one of the | |
81 * cpu/<arch>/vm/assembler_<arch>* files. | |
82 * | |
83 * Instead of using a linked list of unresolved instructions, a Label has | |
84 * an array of unresolved instruction code offsets. _patch_index | |
85 * contains the total number of forward references. If the Label's array | |
86 * overflows (i.e., _patch_index grows larger than the array size), a | |
87 * GrowableArray is allocated to hold the remaining offsets. (The cache | |
88 * size is 4 for now, which handles over 99.5% of the cases) | |
89 * | |
90 * Labels may only be used within a single CodeSection. If you need | |
91 * to create references between code sections, use explicit relocations. | |
92 */ | |
93 class Label VALUE_OBJ_CLASS_SPEC { | |
94 private: | |
95 enum { PatchCacheSize = 4 }; | |
96 | |
97 // _loc encodes both the binding state (via its sign) | |
98 // and the binding locator (via its value) of a label. | |
99 // | |
100 // _loc >= 0 bound label, loc() encodes the target (jump) position | |
101 // _loc == -1 unbound label | |
102 int _loc; | |
103 | |
104 // References to instructions that jump to this unresolved label. | |
105 // These instructions need to be patched when the label is bound | |
106 // using the platform-specific patchInstruction() method. | |
107 // | |
108 // To avoid having to allocate from the C-heap each time, we provide | |
109 // a local cache and use the overflow only if we exceed the local cache | |
110 int _patches[PatchCacheSize]; | |
111 int _patch_index; | |
112 GrowableArray<int>* _patch_overflow; | |
113 | |
114 Label(const Label&) { ShouldNotReachHere(); } | |
115 | |
116 public: | |
117 | |
118 /** | |
119 * After binding, be sure 'patch_instructions' is called later to link | |
120 */ | |
121 void bind_loc(int loc) { | |
122 assert(loc >= 0, "illegal locator"); | |
123 assert(_loc == -1, "already bound"); | |
124 _loc = loc; | |
125 } | |
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126 void bind_loc(int pos, int sect) { bind_loc(CodeBuffer::locator(pos, sect)); } |
0 | 127 |
128 #ifndef PRODUCT | |
129 // Iterates over all unresolved instructions for printing | |
130 void print_instructions(MacroAssembler* masm) const; | |
131 #endif // PRODUCT | |
132 | |
133 /** | |
134 * Returns the position of the the Label in the code buffer | |
135 * The position is a 'locator', which encodes both offset and section. | |
136 */ | |
137 int loc() const { | |
138 assert(_loc >= 0, "unbound label"); | |
139 return _loc; | |
140 } | |
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141 int loc_pos() const { return CodeBuffer::locator_pos(loc()); } |
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142 int loc_sect() const { return CodeBuffer::locator_sect(loc()); } |
0 | 143 |
144 bool is_bound() const { return _loc >= 0; } | |
145 bool is_unbound() const { return _loc == -1 && _patch_index > 0; } | |
146 bool is_unused() const { return _loc == -1 && _patch_index == 0; } | |
147 | |
148 /** | |
149 * Adds a reference to an unresolved displacement instruction to | |
150 * this unbound label | |
151 * | |
152 * @param cb the code buffer being patched | |
153 * @param branch_loc the locator of the branch instruction in the code buffer | |
154 */ | |
155 void add_patch_at(CodeBuffer* cb, int branch_loc); | |
156 | |
157 /** | |
158 * Iterate over the list of patches, resolving the instructions | |
159 * Call patch_instruction on each 'branch_loc' value | |
160 */ | |
161 void patch_instructions(MacroAssembler* masm); | |
162 | |
163 void init() { | |
164 _loc = -1; | |
165 _patch_index = 0; | |
166 _patch_overflow = NULL; | |
167 } | |
168 | |
169 Label() { | |
170 init(); | |
171 } | |
172 }; | |
173 | |
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174 // A union type for code which has to assemble both constant and |
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175 // non-constant operands, when the distinction cannot be made |
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176 // statically. |
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177 class RegisterOrConstant VALUE_OBJ_CLASS_SPEC { |
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178 private: |
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179 Register _r; |
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180 intptr_t _c; |
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181 |
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182 public: |
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183 RegisterOrConstant(): _r(noreg), _c(0) {} |
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184 RegisterOrConstant(Register r): _r(r), _c(0) {} |
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185 RegisterOrConstant(intptr_t c): _r(noreg), _c(c) {} |
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186 |
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187 Register as_register() const { assert(is_register(),""); return _r; } |
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188 intptr_t as_constant() const { assert(is_constant(),""); return _c; } |
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189 |
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190 Register register_or_noreg() const { return _r; } |
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191 intptr_t constant_or_zero() const { return _c; } |
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192 |
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193 bool is_register() const { return _r != noreg; } |
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194 bool is_constant() const { return _r == noreg; } |
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195 }; |
0 | 196 |
197 // The Abstract Assembler: Pure assembler doing NO optimizations on the | |
198 // instruction level; i.e., what you write is what you get. | |
199 // The Assembler is generating code into a CodeBuffer. | |
200 class AbstractAssembler : public ResourceObj { | |
201 friend class Label; | |
202 | |
203 protected: | |
204 CodeSection* _code_section; // section within the code buffer | |
205 OopRecorder* _oop_recorder; // support for relocInfo::oop_type | |
206 | |
207 // Code emission & accessing | |
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208 address addr_at(int pos) const { return code_section()->start() + pos; } |
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209 |
0 | 210 |
211 // This routine is called with a label is used for an address. | |
212 // Labels and displacements truck in offsets, but target must return a PC. | |
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213 address target(Label& L) { return code_section()->target(L, pc()); } |
0 | 214 |
215 bool is8bit(int x) const { return -0x80 <= x && x < 0x80; } | |
216 bool isByte(int x) const { return 0 <= x && x < 0x100; } | |
217 bool isShiftCount(int x) const { return 0 <= x && x < 32; } | |
218 | |
219 // Instruction boundaries (required when emitting relocatable values). | |
220 class InstructionMark: public StackObj { | |
221 private: | |
222 AbstractAssembler* _assm; | |
223 | |
224 public: | |
225 InstructionMark(AbstractAssembler* assm) : _assm(assm) { | |
226 assert(assm->inst_mark() == NULL, "overlapping instructions"); | |
227 _assm->set_inst_mark(); | |
228 } | |
229 ~InstructionMark() { | |
230 _assm->clear_inst_mark(); | |
231 } | |
232 }; | |
233 friend class InstructionMark; | |
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234 #ifdef ASSERT |
0 | 235 // Make it return true on platforms which need to verify |
236 // instruction boundaries for some operations. | |
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237 static bool pd_check_instruction_mark(); |
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238 |
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239 // Add delta to short branch distance to verify that it still fit into imm8. |
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240 int _short_branch_delta; |
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241 |
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242 int short_branch_delta() const { return _short_branch_delta; } |
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243 void set_short_branch_delta() { _short_branch_delta = 32; } |
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244 void clear_short_branch_delta() { _short_branch_delta = 0; } |
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245 |
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246 class ShortBranchVerifier: public StackObj { |
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247 private: |
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248 AbstractAssembler* _assm; |
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249 |
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250 public: |
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251 ShortBranchVerifier(AbstractAssembler* assm) : _assm(assm) { |
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252 assert(assm->short_branch_delta() == 0, "overlapping instructions"); |
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253 _assm->set_short_branch_delta(); |
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254 } |
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255 ~ShortBranchVerifier() { |
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256 _assm->clear_short_branch_delta(); |
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257 } |
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258 }; |
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259 #else |
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260 // Dummy in product. |
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261 class ShortBranchVerifier: public StackObj { |
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262 public: |
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263 ShortBranchVerifier(AbstractAssembler* assm) {} |
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264 }; |
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265 #endif |
0 | 266 |
267 public: | |
268 | |
269 // Creation | |
270 AbstractAssembler(CodeBuffer* code); | |
271 | |
272 // ensure buf contains all code (call this before using/copying the code) | |
273 void flush(); | |
274 | |
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275 void emit_int8( int8_t x) { code_section()->emit_int8( x); } |
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276 void emit_int16( int16_t x) { code_section()->emit_int16( x); } |
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277 void emit_int32( int32_t x) { code_section()->emit_int32( x); } |
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278 void emit_int64( int64_t x) { code_section()->emit_int64( x); } |
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279 |
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280 void emit_float( jfloat x) { code_section()->emit_float( x); } |
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281 void emit_double( jdouble x) { code_section()->emit_double( x); } |
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282 void emit_address(address x) { code_section()->emit_address(x); } |
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283 |
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284 // min and max values for signed immediate ranges |
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285 static int min_simm(int nbits) { return -(intptr_t(1) << (nbits - 1)) ; } |
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286 static int max_simm(int nbits) { return (intptr_t(1) << (nbits - 1)) - 1; } |
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287 |
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288 // Define some: |
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289 static int min_simm10() { return min_simm(10); } |
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290 static int min_simm13() { return min_simm(13); } |
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291 static int min_simm16() { return min_simm(16); } |
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292 |
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293 // Test if x is within signed immediate range for nbits |
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294 static bool is_simm(intptr_t x, int nbits) { return min_simm(nbits) <= x && x <= max_simm(nbits); } |
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295 |
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296 // Define some: |
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297 static bool is_simm5( intptr_t x) { return is_simm(x, 5 ); } |
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298 static bool is_simm8( intptr_t x) { return is_simm(x, 8 ); } |
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299 static bool is_simm10(intptr_t x) { return is_simm(x, 10); } |
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300 static bool is_simm11(intptr_t x) { return is_simm(x, 11); } |
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301 static bool is_simm12(intptr_t x) { return is_simm(x, 12); } |
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302 static bool is_simm13(intptr_t x) { return is_simm(x, 13); } |
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303 static bool is_simm16(intptr_t x) { return is_simm(x, 16); } |
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304 static bool is_simm26(intptr_t x) { return is_simm(x, 26); } |
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305 static bool is_simm32(intptr_t x) { return is_simm(x, 32); } |
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306 |
0 | 307 // Accessors |
308 CodeSection* code_section() const { return _code_section; } | |
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309 CodeBuffer* code() const { return code_section()->outer(); } |
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310 int sect() const { return code_section()->index(); } |
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311 address pc() const { return code_section()->end(); } |
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312 int offset() const { return code_section()->size(); } |
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313 int locator() const { return CodeBuffer::locator(offset(), sect()); } |
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314 |
0 | 315 OopRecorder* oop_recorder() const { return _oop_recorder; } |
316 void set_oop_recorder(OopRecorder* r) { _oop_recorder = r; } | |
317 | |
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318 address inst_mark() const { return code_section()->mark(); } |
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319 void set_inst_mark() { code_section()->set_mark(); } |
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320 void clear_inst_mark() { code_section()->clear_mark(); } |
0 | 321 |
322 // Constants in code | |
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323 void relocate(RelocationHolder const& rspec, int format = 0) { |
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324 assert(!pd_check_instruction_mark() |
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325 || inst_mark() == NULL || inst_mark() == code_section()->end(), |
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326 "call relocate() between instructions"); |
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327 code_section()->relocate(code_section()->end(), rspec, format); |
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328 } |
0 | 329 void relocate( relocInfo::relocType rtype, int format = 0) { |
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330 code_section()->relocate(code_section()->end(), rtype, format); |
0 | 331 } |
332 | |
333 static int code_fill_byte(); // used to pad out odd-sized code buffers | |
334 | |
335 // Associate a comment with the current offset. It will be printed | |
336 // along with the disassembly when printing nmethods. Currently | |
337 // only supported in the instruction section of the code buffer. | |
338 void block_comment(const char* comment); | |
339 | |
340 // Label functions | |
341 void bind(Label& L); // binds an unbound label L to the current code position | |
342 | |
343 // Move to a different section in the same code buffer. | |
344 void set_code_section(CodeSection* cs); | |
345 | |
346 // Inform assembler when generating stub code and relocation info | |
347 address start_a_stub(int required_space); | |
348 void end_a_stub(); | |
349 // Ditto for constants. | |
350 address start_a_const(int required_space, int required_align = sizeof(double)); | |
7197 | 351 void end_a_const(CodeSection* cs); // Pass the codesection to continue in (insts or stubs?). |
0 | 352 |
2008 | 353 // constants support |
7197 | 354 // |
355 // We must remember the code section (insts or stubs) in c1 | |
356 // so we can reset to the proper section in end_a_const(). | |
2008 | 357 address long_constant(jlong c) { |
7197 | 358 CodeSection* c1 = _code_section; |
2008 | 359 address ptr = start_a_const(sizeof(c), sizeof(c)); |
360 if (ptr != NULL) { | |
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361 emit_int64(c); |
7197 | 362 end_a_const(c1); |
2008 | 363 } |
364 return ptr; | |
365 } | |
0 | 366 address double_constant(jdouble c) { |
7197 | 367 CodeSection* c1 = _code_section; |
0 | 368 address ptr = start_a_const(sizeof(c), sizeof(c)); |
369 if (ptr != NULL) { | |
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370 emit_double(c); |
7197 | 371 end_a_const(c1); |
0 | 372 } |
373 return ptr; | |
374 } | |
375 address float_constant(jfloat c) { | |
7197 | 376 CodeSection* c1 = _code_section; |
0 | 377 address ptr = start_a_const(sizeof(c), sizeof(c)); |
378 if (ptr != NULL) { | |
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379 emit_float(c); |
7197 | 380 end_a_const(c1); |
0 | 381 } |
382 return ptr; | |
383 } | |
2008 | 384 address address_constant(address c) { |
7197 | 385 CodeSection* c1 = _code_section; |
2008 | 386 address ptr = start_a_const(sizeof(c), sizeof(c)); |
387 if (ptr != NULL) { | |
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388 emit_address(c); |
7197 | 389 end_a_const(c1); |
2008 | 390 } |
391 return ptr; | |
392 } | |
0 | 393 address address_constant(address c, RelocationHolder const& rspec) { |
7197 | 394 CodeSection* c1 = _code_section; |
0 | 395 address ptr = start_a_const(sizeof(c), sizeof(c)); |
396 if (ptr != NULL) { | |
397 relocate(rspec); | |
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398 emit_address(c); |
7197 | 399 end_a_const(c1); |
0 | 400 } |
401 return ptr; | |
402 } | |
403 | |
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404 // Bootstrapping aid to cope with delayed determination of constants. |
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405 // Returns a static address which will eventually contain the constant. |
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406 // The value zero (NULL) stands instead of a constant which is still uncomputed. |
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407 // Thus, the eventual value of the constant must not be zero. |
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408 // This is fine, since this is designed for embedding object field |
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409 // offsets in code which must be generated before the object class is loaded. |
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410 // Field offsets are never zero, since an object's header (mark word) |
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411 // is located at offset zero. |
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412 RegisterOrConstant delayed_value(int(*value_fn)(), Register tmp, int offset = 0); |
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413 RegisterOrConstant delayed_value(address(*value_fn)(), Register tmp, int offset = 0); |
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414 virtual RegisterOrConstant delayed_value_impl(intptr_t* delayed_value_addr, Register tmp, int offset) = 0; |
622
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415 // Last overloading is platform-dependent; look in assembler_<arch>.cpp. |
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416 static intptr_t* delayed_value_addr(int(*constant_fn)()); |
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417 static intptr_t* delayed_value_addr(address(*constant_fn)()); |
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418 static void update_delayed_values(); |
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419 |
0 | 420 // Bang stack to trigger StackOverflowError at a safe location |
421 // implementation delegates to machine-specific bang_stack_with_offset | |
422 void generate_stack_overflow_check( int frame_size_in_bytes ); | |
423 virtual void bang_stack_with_offset(int offset) = 0; | |
424 | |
425 | |
426 /** | |
427 * A platform-dependent method to patch a jump instruction that refers | |
428 * to this label. | |
429 * | |
430 * @param branch the location of the instruction to patch | |
431 * @param masm the assembler which generated the branch | |
432 */ | |
433 void pd_patch_instruction(address branch, address target); | |
434 | |
435 }; | |
436 | |
1972 | 437 #ifdef TARGET_ARCH_x86 |
438 # include "assembler_x86.hpp" | |
439 #endif | |
440 #ifdef TARGET_ARCH_sparc | |
441 # include "assembler_sparc.hpp" | |
442 #endif | |
443 #ifdef TARGET_ARCH_zero | |
444 # include "assembler_zero.hpp" | |
445 #endif | |
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446 #ifdef TARGET_ARCH_arm |
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447 # include "assembler_arm.hpp" |
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448 #endif |
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449 #ifdef TARGET_ARCH_ppc |
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450 # include "assembler_ppc.hpp" |
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451 #endif |
1972 | 452 |
453 | |
454 #endif // SHARE_VM_ASM_ASSEMBLER_HPP |