1 // Copyright 2012 the V8 project authors. All rights reserved.
2 // Use of this source code is governed by a BSD-style license that can be
3 // found in the LICENSE file.
4 
5 #include "src/codegen.h"
6 
7 #if defined(V8_OS_AIX)
8 #include <fenv.h>  // NOLINT(build/c++11)
9 #endif
10 #include "src/ast/prettyprinter.h"
11 #include "src/bootstrapper.h"
12 #include "src/compiler.h"
13 #include "src/debug/debug.h"
14 #include "src/parsing/parser.h"
15 #include "src/profiler/cpu-profiler.h"
16 #include "src/runtime/runtime.h"
17 
18 namespace v8 {
19 namespace internal {
20 
21 
22 #if defined(V8_OS_WIN)
modulo(double x,double y)23 double modulo(double x, double y) {
24   // Workaround MS fmod bugs. ECMA-262 says:
25   // dividend is finite and divisor is an infinity => result equals dividend
26   // dividend is a zero and divisor is nonzero finite => result equals dividend
27   if (!(std::isfinite(x) && (!std::isfinite(y) && !std::isnan(y))) &&
28       !(x == 0 && (y != 0 && std::isfinite(y)))) {
29     x = fmod(x, y);
30   }
31   return x;
32 }
33 #else  // POSIX
34 
35 double modulo(double x, double y) {
36 #if defined(V8_OS_AIX)
37   // AIX raises an underflow exception for (Number.MIN_VALUE % Number.MAX_VALUE)
38   feclearexcept(FE_ALL_EXCEPT);
39   double result = std::fmod(x, y);
40   int exception = fetestexcept(FE_UNDERFLOW);
41   return (exception ? x : result);
42 #else
43   return std::fmod(x, y);
44 #endif
45 }
46 #endif  // defined(V8_OS_WIN)
47 
48 
49 #define UNARY_MATH_FUNCTION(name, generator)                             \
50   static UnaryMathFunctionWithIsolate fast_##name##_function = nullptr;  \
51   double std_##name(double x, Isolate* isolate) { return std::name(x); } \
52   void init_fast_##name##_function(Isolate* isolate) {                   \
53     if (FLAG_fast_math) fast_##name##_function = generator(isolate);     \
54     if (!fast_##name##_function) fast_##name##_function = std_##name;    \
55   }                                                                      \
56   void lazily_initialize_fast_##name(Isolate* isolate) {                 \
57     if (!fast_##name##_function) init_fast_##name##_function(isolate);   \
58   }                                                                      \
59   double fast_##name(double x, Isolate* isolate) {                       \
60     return (*fast_##name##_function)(x, isolate);                        \
61   }
62 
UNARY_MATH_FUNCTION(sqrt,CreateSqrtFunction)63 UNARY_MATH_FUNCTION(sqrt, CreateSqrtFunction)
64 UNARY_MATH_FUNCTION(exp, CreateExpFunction)
65 
66 #undef UNARY_MATH_FUNCTION
67 
68 
69 #define __ ACCESS_MASM(masm_)
70 
71 #ifdef DEBUG
72 
73 Comment::Comment(MacroAssembler* masm, const char* msg)
74     : masm_(masm), msg_(msg) {
75   __ RecordComment(msg);
76 }
77 
78 
~Comment()79 Comment::~Comment() {
80   if (msg_[0] == '[') __ RecordComment("]");
81 }
82 
83 #endif  // DEBUG
84 
85 #undef __
86 
87 
MakeCodePrologue(CompilationInfo * info,const char * kind)88 void CodeGenerator::MakeCodePrologue(CompilationInfo* info, const char* kind) {
89   bool print_source = false;
90   bool print_ast = false;
91   const char* ftype;
92 
93   if (info->isolate()->bootstrapper()->IsActive()) {
94     print_source = FLAG_print_builtin_source;
95     print_ast = FLAG_print_builtin_ast;
96     ftype = "builtin";
97   } else {
98     print_source = FLAG_print_source;
99     print_ast = FLAG_print_ast;
100     ftype = "user-defined";
101   }
102 
103   if (FLAG_trace_codegen || print_source || print_ast) {
104     base::SmartArrayPointer<char> name = info->GetDebugName();
105     PrintF("[generating %s code for %s function: %s]\n", kind, ftype,
106            name.get());
107   }
108 
109 #ifdef DEBUG
110   if (info->parse_info() && print_source) {
111     PrintF("--- Source from AST ---\n%s\n",
112            PrettyPrinter(info->isolate()).PrintProgram(info->literal()));
113   }
114 
115   if (info->parse_info() && print_ast) {
116     PrintF("--- AST ---\n%s\n",
117            AstPrinter(info->isolate()).PrintProgram(info->literal()));
118   }
119 #endif  // DEBUG
120 }
121 
122 
MakeCodeEpilogue(MacroAssembler * masm,CompilationInfo * info)123 Handle<Code> CodeGenerator::MakeCodeEpilogue(MacroAssembler* masm,
124                                              CompilationInfo* info) {
125   Isolate* isolate = info->isolate();
126 
127   Code::Flags flags;
128   if (info->IsStub() && info->code_stub()) {
129     DCHECK_EQ(info->output_code_kind(), info->code_stub()->GetCodeKind());
130     flags = Code::ComputeFlags(
131         info->output_code_kind(), info->code_stub()->GetICState(),
132         info->code_stub()->GetExtraICState(), info->code_stub()->GetStubType());
133   } else {
134     flags = Code::ComputeFlags(info->output_code_kind());
135   }
136 
137   // Allocate and install the code.
138   CodeDesc desc;
139   bool is_crankshafted =
140       Code::ExtractKindFromFlags(flags) == Code::OPTIMIZED_FUNCTION ||
141       info->IsStub();
142   masm->GetCode(&desc);
143   Handle<Code> code =
144       isolate->factory()->NewCode(desc, flags, masm->CodeObject(),
145                                   false, is_crankshafted,
146                                   info->prologue_offset(),
147                                   info->is_debug() && !is_crankshafted);
148   isolate->counters()->total_compiled_code_size()->Increment(
149       code->instruction_size());
150   isolate->heap()->IncrementCodeGeneratedBytes(is_crankshafted,
151       code->instruction_size());
152   return code;
153 }
154 
155 
PrintCode(Handle<Code> code,CompilationInfo * info)156 void CodeGenerator::PrintCode(Handle<Code> code, CompilationInfo* info) {
157 #ifdef ENABLE_DISASSEMBLER
158   AllowDeferredHandleDereference allow_deference_for_print_code;
159   bool print_code = info->isolate()->bootstrapper()->IsActive()
160       ? FLAG_print_builtin_code
161       : (FLAG_print_code ||
162          (info->IsStub() && FLAG_print_code_stubs) ||
163          (info->IsOptimizing() && FLAG_print_opt_code));
164   if (print_code) {
165     base::SmartArrayPointer<char> debug_name = info->GetDebugName();
166     CodeTracer::Scope tracing_scope(info->isolate()->GetCodeTracer());
167     OFStream os(tracing_scope.file());
168 
169     // Print the source code if available.
170     bool print_source =
171         info->parse_info() && (code->kind() == Code::OPTIMIZED_FUNCTION ||
172                                code->kind() == Code::FUNCTION);
173     if (print_source) {
174       FunctionLiteral* literal = info->literal();
175       Handle<Script> script = info->script();
176       if (!script->IsUndefined() && !script->source()->IsUndefined()) {
177         os << "--- Raw source ---\n";
178         StringCharacterStream stream(String::cast(script->source()),
179                                      literal->start_position());
180         // fun->end_position() points to the last character in the stream. We
181         // need to compensate by adding one to calculate the length.
182         int source_len =
183             literal->end_position() - literal->start_position() + 1;
184         for (int i = 0; i < source_len; i++) {
185           if (stream.HasMore()) {
186             os << AsReversiblyEscapedUC16(stream.GetNext());
187           }
188         }
189         os << "\n\n";
190       }
191     }
192     if (info->IsOptimizing()) {
193       if (FLAG_print_unopt_code && info->parse_info()) {
194         os << "--- Unoptimized code ---\n";
195         info->closure()->shared()->code()->Disassemble(debug_name.get(), os);
196       }
197       os << "--- Optimized code ---\n"
198          << "optimization_id = " << info->optimization_id() << "\n";
199     } else {
200       os << "--- Code ---\n";
201     }
202     if (print_source) {
203       FunctionLiteral* literal = info->literal();
204       os << "source_position = " << literal->start_position() << "\n";
205     }
206     code->Disassemble(debug_name.get(), os);
207     os << "--- End code ---\n";
208   }
209 #endif  // ENABLE_DISASSEMBLER
210 }
211 
212 }  // namespace internal
213 }  // namespace v8
214