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      1 // Copyright 2012 the V8 project authors. All rights reserved.
      2 // Redistribution and use in source and binary forms, with or without
      3 // modification, are permitted provided that the following conditions are
      4 // met:
      5 //
      6 //     * Redistributions of source code must retain the above copyright
      7 //       notice, this list of conditions and the following disclaimer.
      8 //     * Redistributions in binary form must reproduce the above
      9 //       copyright notice, this list of conditions and the following
     10 //       disclaimer in the documentation and/or other materials provided
     11 //       with the distribution.
     12 //     * Neither the name of Google Inc. nor the names of its
     13 //       contributors may be used to endorse or promote products derived
     14 //       from this software without specific prior written permission.
     15 //
     16 // THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
     17 // "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
     18 // LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
     19 // A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
     20 // OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
     21 // SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
     22 // LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
     23 // DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
     24 // THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
     25 // (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
     26 // OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
     27 
     28 #include "v8.h"
     29 
     30 #include "bootstrapper.h"
     31 #include "codegen.h"
     32 #include "compiler.h"
     33 #include "cpu-profiler.h"
     34 #include "debug.h"
     35 #include "prettyprinter.h"
     36 #include "rewriter.h"
     37 #include "runtime.h"
     38 #include "stub-cache.h"
     39 
     40 namespace v8 {
     41 namespace internal {
     42 
     43 #define __ ACCESS_MASM(masm_)
     44 
     45 #ifdef DEBUG
     46 
     47 Comment::Comment(MacroAssembler* masm, const char* msg)
     48     : masm_(masm), msg_(msg) {
     49   __ RecordComment(msg);
     50 }
     51 
     52 
     53 Comment::~Comment() {
     54   if (msg_[0] == '[') __ RecordComment("]");
     55 }
     56 
     57 #endif  // DEBUG
     58 
     59 #undef __
     60 
     61 
     62 void CodeGenerator::MakeCodePrologue(CompilationInfo* info, const char* kind) {
     63   bool print_source = false;
     64   bool print_ast = false;
     65   const char* ftype;
     66 
     67   if (info->isolate()->bootstrapper()->IsActive()) {
     68     print_source = FLAG_print_builtin_source;
     69     print_ast = FLAG_print_builtin_ast;
     70     ftype = "builtin";
     71   } else {
     72     print_source = FLAG_print_source;
     73     print_ast = FLAG_print_ast;
     74     ftype = "user-defined";
     75   }
     76 
     77   if (FLAG_trace_codegen || print_source || print_ast) {
     78     PrintF("[generating %s code for %s function: ", kind, ftype);
     79     if (info->IsStub()) {
     80       const char* name =
     81           CodeStub::MajorName(info->code_stub()->MajorKey(), true);
     82       PrintF("%s", name == NULL ? "<unknown>" : name);
     83     } else {
     84       PrintF("%s", *info->function()->debug_name()->ToCString());
     85     }
     86     PrintF("]\n");
     87   }
     88 
     89 #ifdef DEBUG
     90   if (!info->IsStub() && print_source) {
     91     PrintF("--- Source from AST ---\n%s\n",
     92            PrettyPrinter().PrintProgram(info->function()));
     93   }
     94 
     95   if (!info->IsStub() && print_ast) {
     96     PrintF("--- AST ---\n%s\n",
     97            AstPrinter().PrintProgram(info->function()));
     98   }
     99 #endif  // DEBUG
    100 }
    101 
    102 
    103 Handle<Code> CodeGenerator::MakeCodeEpilogue(MacroAssembler* masm,
    104                                              Code::Flags flags,
    105                                              CompilationInfo* info) {
    106   Isolate* isolate = info->isolate();
    107 
    108   // Allocate and install the code.
    109   CodeDesc desc;
    110   bool is_crankshafted =
    111       Code::ExtractKindFromFlags(flags) == Code::OPTIMIZED_FUNCTION ||
    112       info->IsStub();
    113   masm->GetCode(&desc);
    114   Handle<Code> code =
    115       isolate->factory()->NewCode(desc, flags, masm->CodeObject(),
    116                                   false, is_crankshafted);
    117   if (!code.is_null()) {
    118     isolate->counters()->total_compiled_code_size()->Increment(
    119         code->instruction_size());
    120     code->set_prologue_offset(info->prologue_offset());
    121   }
    122   return code;
    123 }
    124 
    125 
    126 void CodeGenerator::PrintCode(Handle<Code> code, CompilationInfo* info) {
    127 #ifdef ENABLE_DISASSEMBLER
    128   AllowDeferredHandleDereference allow_deference_for_print_code;
    129   bool print_code = Isolate::Current()->bootstrapper()->IsActive()
    130       ? FLAG_print_builtin_code
    131       : (FLAG_print_code ||
    132          (info->IsStub() && FLAG_print_code_stubs) ||
    133          (info->IsOptimizing() && FLAG_print_opt_code));
    134   if (print_code) {
    135     // Print the source code if available.
    136     FunctionLiteral* function = info->function();
    137     if (code->kind() == Code::OPTIMIZED_FUNCTION) {
    138       Handle<Script> script = info->script();
    139       if (!script->IsUndefined() && !script->source()->IsUndefined()) {
    140         PrintF("--- Raw source ---\n");
    141         ConsStringIteratorOp op;
    142         StringCharacterStream stream(String::cast(script->source()),
    143                                      &op,
    144                                      function->start_position());
    145         // fun->end_position() points to the last character in the stream. We
    146         // need to compensate by adding one to calculate the length.
    147         int source_len =
    148             function->end_position() - function->start_position() + 1;
    149         for (int i = 0; i < source_len; i++) {
    150           if (stream.HasMore()) PrintF("%c", stream.GetNext());
    151         }
    152         PrintF("\n\n");
    153       }
    154     }
    155     if (info->IsOptimizing()) {
    156       if (FLAG_print_unopt_code) {
    157         PrintF("--- Unoptimized code ---\n");
    158         info->closure()->shared()->code()->Disassemble(
    159             *function->debug_name()->ToCString());
    160       }
    161       PrintF("--- Optimized code ---\n");
    162     } else {
    163       PrintF("--- Code ---\n");
    164     }
    165     if (info->IsStub()) {
    166       CodeStub::Major major_key = info->code_stub()->MajorKey();
    167       code->Disassemble(CodeStub::MajorName(major_key, false));
    168     } else {
    169       code->Disassemble(*function->debug_name()->ToCString());
    170     }
    171   }
    172 #endif  // ENABLE_DISASSEMBLER
    173 }
    174 
    175 
    176 bool CodeGenerator::ShouldGenerateLog(Expression* type) {
    177   ASSERT(type != NULL);
    178   Isolate* isolate = Isolate::Current();
    179   if (!isolate->logger()->is_logging() &&
    180       !isolate->cpu_profiler()->is_profiling()) {
    181     return false;
    182   }
    183   Handle<String> name = Handle<String>::cast(type->AsLiteral()->value());
    184   if (FLAG_log_regexp) {
    185     if (name->IsOneByteEqualTo(STATIC_ASCII_VECTOR("regexp")))
    186       return true;
    187   }
    188   return false;
    189 }
    190 
    191 
    192 bool CodeGenerator::RecordPositions(MacroAssembler* masm,
    193                                     int pos,
    194                                     bool right_here) {
    195   if (pos != RelocInfo::kNoPosition) {
    196     masm->positions_recorder()->RecordStatementPosition(pos);
    197     masm->positions_recorder()->RecordPosition(pos);
    198     if (right_here) {
    199       return masm->positions_recorder()->WriteRecordedPositions();
    200     }
    201   }
    202   return false;
    203 }
    204 
    205 
    206 void ArgumentsAccessStub::Generate(MacroAssembler* masm) {
    207   switch (type_) {
    208     case READ_ELEMENT:
    209       GenerateReadElement(masm);
    210       break;
    211     case NEW_NON_STRICT_FAST:
    212       GenerateNewNonStrictFast(masm);
    213       break;
    214     case NEW_NON_STRICT_SLOW:
    215       GenerateNewNonStrictSlow(masm);
    216       break;
    217     case NEW_STRICT:
    218       GenerateNewStrict(masm);
    219       break;
    220   }
    221 }
    222 
    223 
    224 int CEntryStub::MinorKey() {
    225   int result = (save_doubles_ == kSaveFPRegs) ? 1 : 0;
    226   ASSERT(result_size_ == 1 || result_size_ == 2);
    227 #ifdef _WIN64
    228   return result | ((result_size_ == 1) ? 0 : 2);
    229 #else
    230   return result;
    231 #endif
    232 }
    233 
    234 
    235 } }  // namespace v8::internal
    236