dfg/DFGCapabilities.cpp

   1 /*
   2  * Copyright (C) 2011, 2013-2015 Apple Inc. All rights reserved.
   3  *
   4  * Redistribution and use in source and binary forms, with or without
   5  * modification, are permitted provided that the following conditions
   6  * are met:
   7  * 1. Redistributions of source code must retain the above copyright
   8  *    notice, this list of conditions and the following disclaimer.
   9  * 2. Redistributions in binary form must reproduce the above copyright
  10  *    notice, this list of conditions and the following disclaimer in the
  11  *    documentation and/or other materials provided with the distribution.
  12  *
  13  * THIS SOFTWARE IS PROVIDED BY APPLE INC. ``AS IS'' AND ANY
  14  * EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
  15  * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
  16  * PURPOSE ARE DISCLAIMED.  IN NO EVENT SHALL APPLE INC. OR
  17  * CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL,
  18  * EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO,
  19  * PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR
  20  * PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY
  21  * OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
  22  * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
  23  * OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
  24  */
  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()->isInliningCandidate();
  48 }
  49
  50 bool mightCompileEval(CodeBlock* codeBlock)
  51 {
  52     return isSupported()
  53         && codeBlock->instructionCount() <= Options::maximumOptimizationCandidateInstructionCount();
  54 }
  55 bool mightCompileProgram(CodeBlock* codeBlock)
  56 {
  57     return isSupported()
  58         && codeBlock->instructionCount() <= Options::maximumOptimizationCandidateInstructionCount();
  59 }
  60 bool mightCompileFunctionForCall(CodeBlock* codeBlock)
  61 {
  62     return isSupported()
  63         && codeBlock->instructionCount() <= Options::maximumOptimizationCandidateInstructionCount();
  64 }
  65 bool mightCompileFunctionForConstruct(CodeBlock* codeBlock)
  66 {
  67     return isSupported()
  68         && codeBlock->instructionCount() <= Options::maximumOptimizationCandidateInstructionCount();
  69 }
  70
  71 bool mightInlineFunctionForCall(CodeBlock* codeBlock)
  72 {
  73     return codeBlock->instructionCount() <= Options::maximumFunctionForCallInlineCandidateInstructionCount()
  74         && isSupportedForInlining(codeBlock);
  75 }
  76 bool mightInlineFunctionForClosureCall(CodeBlock* codeBlock)
  77 {
  78     return codeBlock->instructionCount() <= Options::maximumFunctionForClosureCallInlineCandidateInstructionCount()
  79         && isSupportedForInlining(codeBlock);
  80 }
  81 bool mightInlineFunctionForConstruct(CodeBlock* codeBlock)
  82 {
  83     return codeBlock->instructionCount() <= Options::maximumFunctionForConstructInlineCandidateInstructionCount()
  84         && isSupportedForInlining(codeBlock);
  85 }
  86
  87 inline void debugFail(CodeBlock* codeBlock, OpcodeID opcodeID, CapabilityLevel result)
  88 {
  89     if (Options::verboseCompilation() && !canCompile(result))
  90         dataLog("Cannot compile code block ", *codeBlock, " because of opcode ", opcodeNames[opcodeID], "\n");
  91 }
  92
  93 CapabilityLevel capabilityLevel(OpcodeID opcodeID, CodeBlock* codeBlock, Instruction* pc)
  94 {
  95     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.
  96
  97     switch (opcodeID) {
  98     case op_enter:
  99     case op_to_this:
 100     case op_check_tdz:
 101     case op_create_this:
 102     case op_bitand:
 103     case op_bitor:
 104     case op_bitxor:
 105     case op_rshift:
 106     case op_lshift:
 107     case op_urshift:
 108     case op_unsigned:
 109     case op_inc:
 110     case op_dec:
 111     case op_add:
 112     case op_sub:
 113     case op_negate:
 114     case op_mul:
 115     case op_mod:
 116     case op_div:
 117     case op_debug:
 118     case op_profile_will_call:
 119     case op_profile_did_call:
 120     case op_profile_type:
 121     case op_profile_control_flow:
 122     case op_mov:
 123     case op_check_has_instance:
 124     case op_instanceof:
 125     case op_is_undefined:
 126     case op_is_boolean:
 127     case op_is_number:
 128     case op_is_string:
 129     case op_is_object:
 130     case op_is_object_or_null:
 131     case op_is_function:
 132     case op_not:
 133     case op_less:
 134     case op_lesseq:
 135     case op_greater:
 136     case op_greatereq:
 137     case op_eq:
 138     case op_eq_null:
 139     case op_stricteq:
 140     case op_neq:
 141     case op_neq_null:
 142     case op_nstricteq:
 143     case op_get_by_val:
 144     case op_put_by_val:
 145     case op_put_by_val_direct:
 146     case op_get_by_id:
 147     case op_get_by_id_out_of_line:
 148     case op_get_array_length:
 149     case op_put_by_id:
 150     case op_put_by_id_out_of_line:
 151     case op_put_by_id_transition_direct:
 152     case op_put_by_id_transition_direct_out_of_line:
 153     case op_put_by_id_transition_normal:
 154     case op_put_by_id_transition_normal_out_of_line:
 155     case op_init_global_const_nop:
 156     case op_init_global_const:
 157     case op_jmp:
 158     case op_jtrue:
 159     case op_jfalse:
 160     case op_jeq_null:
 161     case op_jneq_null:
 162     case op_jless:
 163     case op_jlesseq:
 164     case op_jgreater:
 165     case op_jgreatereq:
 166     case op_jnless:
 167     case op_jnlesseq:
 168     case op_jngreater:
 169     case op_jngreatereq:
 170     case op_loop_hint:
 171     case op_ret:
 172     case op_end:
 173     case op_new_object:
 174     case op_new_array:
 175     case op_new_array_with_size:
 176     case op_new_array_buffer:
 177     case op_strcat:
 178     case op_to_primitive:
 179     case op_throw:
 180     case op_throw_static_error:
 181     case op_call:
 182     case op_construct:
 183     case op_call_varargs:
 184     case op_construct_varargs:
 185     case op_create_direct_arguments:
 186     case op_create_scoped_arguments:
 187     case op_create_out_of_band_arguments:
 188     case op_get_from_arguments:
 189     case op_put_to_arguments:
 190     case op_jneq_ptr:
 191     case op_typeof:
 192     case op_to_number:
 193     case op_to_string:
 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_property_enumerator:
 205     case op_enumerator_structure_pname:
 206     case op_enumerator_generic_pname:
 207     case op_to_index_string:
 208     case op_new_func:
 209     case op_new_func_exp:
 210     case op_create_lexical_environment:
 211         return CanCompileAndInline;
 212
 213     case op_put_to_scope: {
 214         ResolveType resolveType = ResolveModeAndType(pc[4].u.operand).type();
 215         // If we're writing to a readonly property we emit a Dynamic put that
 216         // the DFG can't currently handle.
 217         if (resolveType == Dynamic)
 218             return CannotCompile;
 219         return CanCompileAndInline;
 220     }
 221
 222     case op_resolve_scope: {
 223         // We don't compile 'catch' or 'with', so there's no point in compiling variable resolution within them.
 224         ResolveType resolveType = ResolveModeAndType(pc[4].u.operand).type();
 225         if (resolveType == Dynamic)
 226             return CannotCompile;
 227         return CanCompileAndInline;
 228     }
 229
 230     case op_new_regexp:
 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