JIT debugging features that selectively disable the JITs for code blocks need to...
[WebKit-https.git] / Source / JavaScriptCore / dfg / DFGCapabilities.cpp
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25
26 #include "config.h"
27 #include "DFGCapabilities.h"
28
29 #if ENABLE(DFG_JIT)
30
31 #include "CodeBlock.h"
32 #include "DFGCommon.h"
33 #include "Interpreter.h"
34 #include "JSCInlines.h"
35 #include "Options.h"
36
37 namespace JSC { namespace DFG {
38
39 bool isSupported()
40 {
41     return Options::useDFGJIT()
42         && MacroAssembler::supportsFloatingPoint();
43 }
44
45 bool isSupportedForInlining(CodeBlock* codeBlock)
46 {
47     return !codeBlock->ownerExecutable()->needsActivation()
48         && codeBlock->ownerExecutable()->isInliningCandidate();
49 }
50
51 bool mightCompileEval(CodeBlock* codeBlock)
52 {
53     return isSupported()
54         && codeBlock->instructionCount() <= Options::maximumOptimizationCandidateInstructionCount();
55 }
56 bool mightCompileProgram(CodeBlock* codeBlock)
57 {
58     return isSupported()
59         && codeBlock->instructionCount() <= Options::maximumOptimizationCandidateInstructionCount();
60 }
61 bool mightCompileFunctionForCall(CodeBlock* codeBlock)
62 {
63     return isSupported()
64         && codeBlock->instructionCount() <= Options::maximumOptimizationCandidateInstructionCount();
65 }
66 bool mightCompileFunctionForConstruct(CodeBlock* codeBlock)
67 {
68     return isSupported()
69         && codeBlock->instructionCount() <= Options::maximumOptimizationCandidateInstructionCount();
70 }
71
72 bool mightInlineFunctionForCall(CodeBlock* codeBlock)
73 {
74     return codeBlock->instructionCount() <= Options::maximumFunctionForCallInlineCandidateInstructionCount()
75         && isSupportedForInlining(codeBlock);
76 }
77 bool mightInlineFunctionForClosureCall(CodeBlock* codeBlock)
78 {
79     return codeBlock->instructionCount() <= Options::maximumFunctionForClosureCallInlineCandidateInstructionCount()
80         && isSupportedForInlining(codeBlock);
81 }
82 bool mightInlineFunctionForConstruct(CodeBlock* codeBlock)
83 {
84     return codeBlock->instructionCount() <= Options::maximumFunctionForConstructInlineCandidateInstructionCount()
85         && isSupportedForInlining(codeBlock);
86 }
87
88 inline void debugFail(CodeBlock* codeBlock, OpcodeID opcodeID, CapabilityLevel result)
89 {
90     if (Options::verboseCompilation() && !canCompile(result))
91         dataLog("Cannot compile code block ", *codeBlock, " because of opcode ", opcodeNames[opcodeID], "\n");
92 }
93
94 CapabilityLevel capabilityLevel(OpcodeID opcodeID, CodeBlock* codeBlock, Instruction* pc)
95 {
96     UNUSED_PARAM(codeBlock); // This function does some bytecode parsing. Ordinarily bytecode parsing requires the owning CodeBlock. It's sort of strange that we don't use it here right now.
97     
98     switch (opcodeID) {
99     case op_enter:
100     case op_touch_entry:
101     case op_to_this:
102     case op_create_this:
103     case op_bitand:
104     case op_bitor:
105     case op_bitxor:
106     case op_rshift:
107     case op_lshift:
108     case op_urshift:
109     case op_unsigned:
110     case op_inc:
111     case op_dec:
112     case op_add:
113     case op_sub:
114     case op_negate:
115     case op_mul:
116     case op_mod:
117     case op_div:
118     case op_debug:
119     case op_profile_will_call:
120     case op_profile_did_call:
121     case op_profile_type:
122     case op_profile_control_flow:
123     case op_mov:
124     case op_check_has_instance:
125     case op_instanceof:
126     case op_is_undefined:
127     case op_is_boolean:
128     case op_is_number:
129     case op_is_string:
130     case op_is_object:
131     case op_is_object_or_null:
132     case op_is_function:
133     case op_not:
134     case op_less:
135     case op_lesseq:
136     case op_greater:
137     case op_greatereq:
138     case op_eq:
139     case op_eq_null:
140     case op_stricteq:
141     case op_neq:
142     case op_neq_null:
143     case op_nstricteq:
144     case op_get_by_val:
145     case op_put_by_val:
146     case op_put_by_val_direct:
147     case op_get_by_id:
148     case op_get_by_id_out_of_line:
149     case op_get_array_length:
150     case op_put_by_id:
151     case op_put_by_id_out_of_line:
152     case op_put_by_id_transition_direct:
153     case op_put_by_id_transition_direct_out_of_line:
154     case op_put_by_id_transition_normal:
155     case op_put_by_id_transition_normal_out_of_line:
156     case op_init_global_const_nop:
157     case op_init_global_const:
158     case op_jmp:
159     case op_jtrue:
160     case op_jfalse:
161     case op_jeq_null:
162     case op_jneq_null:
163     case op_jless:
164     case op_jlesseq:
165     case op_jgreater:
166     case op_jgreatereq:
167     case op_jnless:
168     case op_jnlesseq:
169     case op_jngreater:
170     case op_jngreatereq:
171     case op_loop_hint:
172     case op_ret:
173     case op_end:
174     case op_new_object:
175     case op_new_array:
176     case op_new_array_with_size:
177     case op_new_array_buffer:
178     case op_strcat:
179     case op_to_primitive:
180     case op_throw:
181     case op_throw_static_error:
182     case op_call:
183     case op_construct:
184     case op_call_varargs:
185     case op_construct_varargs:
186     case op_init_lazy_reg:
187     case op_create_arguments:
188     case op_tear_off_arguments:
189     case op_get_argument_by_val:
190     case op_get_arguments_length:
191     case op_jneq_ptr:
192     case op_typeof:
193     case op_to_number:
194     case op_switch_imm:
195     case op_switch_char:
196     case op_in:
197     case op_get_scope:
198     case op_get_from_scope:
199     case op_get_enumerable_length:
200     case op_has_generic_property:
201     case op_has_structure_property:
202     case op_has_indexed_property:
203     case op_get_direct_pname:
204     case op_get_structure_property_enumerator:
205     case op_get_generic_property_enumerator:
206     case op_next_enumerator_pname:
207     case op_to_index_string:
208         return CanCompileAndInline;
209
210     case op_put_to_scope: {
211         ResolveType resolveType = ResolveModeAndType(pc[4].u.operand).type();
212         // If we're writing to a readonly property we emit a Dynamic put that
213         // the DFG can't currently handle.
214         if (resolveType == Dynamic)
215             return CannotCompile;
216         return CanCompileAndInline;
217     }
218
219     case op_resolve_scope: {
220         // We don't compile 'catch' or 'with', so there's no point in compiling variable resolution within them.
221         ResolveType resolveType = ResolveModeAndType(pc[4].u.operand).type();
222         if (resolveType == Dynamic)
223             return CannotCompile;
224         return CanCompileAndInline;
225     }
226
227     case op_new_regexp: 
228     case op_create_lexical_environment:
229     case op_new_func:
230     case op_new_func_exp:
231     case op_switch_string: // Don't inline because we don't want to copy string tables in the concurrent JIT.
232         return CanCompile;
233
234     default:
235         return CannotCompile;
236     }
237 }
238
239 CapabilityLevel capabilityLevel(CodeBlock* codeBlock)
240 {
241     Interpreter* interpreter = codeBlock->vm()->interpreter;
242     Instruction* instructionsBegin = codeBlock->instructions().begin();
243     unsigned instructionCount = codeBlock->instructions().size();
244     CapabilityLevel result = CanCompileAndInline;
245     
246     for (unsigned bytecodeOffset = 0; bytecodeOffset < instructionCount; ) {
247         switch (interpreter->getOpcodeID(instructionsBegin[bytecodeOffset].u.opcode)) {
248 #define DEFINE_OP(opcode, length) \
249         case opcode: { \
250             CapabilityLevel newResult = leastUpperBound(result, capabilityLevel(opcode, codeBlock, instructionsBegin + bytecodeOffset)); \
251             if (newResult != result) { \
252                 debugFail(codeBlock, opcode, newResult); \
253                 result = newResult; \
254             } \
255             bytecodeOffset += length; \
256             break; \
257         }
258             FOR_EACH_OPCODE_ID(DEFINE_OP)
259 #undef DEFINE_OP
260         default:
261             RELEASE_ASSERT_NOT_REACHED();
262             break;
263         }
264     }
265     
266     return result;
267 }
268
269 } } // namespace JSC::DFG
270
271 #endif