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// Copyright 2012 the V8 project authors. All rights reserved.
// Use of this source code is governed by a BSD-style license that can be
// found in the LICENSE file.
#include "src/codegen.h"
#if defined(V8_OS_AIX)
#include <fenv.h> // NOLINT(build/c++11)
#endif
#include "src/ast/prettyprinter.h"
#include "src/bootstrapper.h"
#include "src/compiler.h"
#include "src/debug/debug.h"
#include "src/parsing/parser.h"
#include "src/profiler/cpu-profiler.h"
#include "src/runtime/runtime.h"
namespace v8 {
namespace internal {
#if defined(V8_OS_WIN)
double modulo(double x, double y) {
// Workaround MS fmod bugs. ECMA-262 says:
// dividend is finite and divisor is an infinity => result equals dividend
// dividend is a zero and divisor is nonzero finite => result equals dividend
if (!(std::isfinite(x) && (!std::isfinite(y) && !std::isnan(y))) &&
!(x == 0 && (y != 0 && std::isfinite(y)))) {
x = fmod(x, y);
}
return x;
}
#else // POSIX
double modulo(double x, double y) {
#if defined(V8_OS_AIX)
// AIX raises an underflow exception for (Number.MIN_VALUE % Number.MAX_VALUE)
feclearexcept(FE_ALL_EXCEPT);
double result = std::fmod(x, y);
int exception = fetestexcept(FE_UNDERFLOW);
return (exception ? x : result);
#else
return std::fmod(x, y);
#endif
}
#endif // defined(V8_OS_WIN)
#define UNARY_MATH_FUNCTION(name, generator) \
static UnaryMathFunctionWithIsolate fast_##name##_function = nullptr; \
double std_##name(double x, Isolate* isolate) { return std::name(x); } \
void init_fast_##name##_function(Isolate* isolate) { \
if (FLAG_fast_math) fast_##name##_function = generator(isolate); \
if (!fast_##name##_function) fast_##name##_function = std_##name; \
} \
void lazily_initialize_fast_##name(Isolate* isolate) { \
if (!fast_##name##_function) init_fast_##name##_function(isolate); \
} \
double fast_##name(double x, Isolate* isolate) { \
return (*fast_##name##_function)(x, isolate); \
}
UNARY_MATH_FUNCTION(sqrt, CreateSqrtFunction)
UNARY_MATH_FUNCTION(exp, CreateExpFunction)
#undef UNARY_MATH_FUNCTION
#define __ ACCESS_MASM(masm_)
#ifdef DEBUG
Comment::Comment(MacroAssembler* masm, const char* msg)
: masm_(masm), msg_(msg) {
__ RecordComment(msg);
}
Comment::~Comment() {
if (msg_[0] == '[') __ RecordComment("]");
}
#endif // DEBUG
#undef __
void CodeGenerator::MakeCodePrologue(CompilationInfo* info, const char* kind) {
bool print_source = false;
bool print_ast = false;
const char* ftype;
if (info->isolate()->bootstrapper()->IsActive()) {
print_source = FLAG_print_builtin_source;
print_ast = FLAG_print_builtin_ast;
ftype = "builtin";
} else {
print_source = FLAG_print_source;
print_ast = FLAG_print_ast;
ftype = "user-defined";
}
if (FLAG_trace_codegen || print_source || print_ast) {
base::SmartArrayPointer<char> name = info->GetDebugName();
PrintF("[generating %s code for %s function: %s]\n", kind, ftype,
name.get());
}
#ifdef DEBUG
if (info->parse_info() && print_source) {
PrintF("--- Source from AST ---\n%s\n",
PrettyPrinter(info->isolate()).PrintProgram(info->literal()));
}
if (info->parse_info() && print_ast) {
PrintF("--- AST ---\n%s\n",
AstPrinter(info->isolate()).PrintProgram(info->literal()));
}
#endif // DEBUG
}
Handle<Code> CodeGenerator::MakeCodeEpilogue(MacroAssembler* masm,
CompilationInfo* info) {
Isolate* isolate = info->isolate();
Code::Flags flags;
if (info->IsStub() && info->code_stub()) {
DCHECK_EQ(info->output_code_kind(), info->code_stub()->GetCodeKind());
flags = Code::ComputeFlags(
info->output_code_kind(), info->code_stub()->GetICState(),
info->code_stub()->GetExtraICState(), info->code_stub()->GetStubType());
} else {
flags = Code::ComputeFlags(info->output_code_kind());
}
// Allocate and install the code.
CodeDesc desc;
bool is_crankshafted =
Code::ExtractKindFromFlags(flags) == Code::OPTIMIZED_FUNCTION ||
info->IsStub();
masm->GetCode(&desc);
Handle<Code> code =
isolate->factory()->NewCode(desc, flags, masm->CodeObject(),
false, is_crankshafted,
info->prologue_offset(),
info->is_debug() && !is_crankshafted);
isolate->counters()->total_compiled_code_size()->Increment(
code->instruction_size());
isolate->heap()->IncrementCodeGeneratedBytes(is_crankshafted,
code->instruction_size());
return code;
}
void CodeGenerator::PrintCode(Handle<Code> code, CompilationInfo* info) {
#ifdef ENABLE_DISASSEMBLER
AllowDeferredHandleDereference allow_deference_for_print_code;
bool print_code = info->isolate()->bootstrapper()->IsActive()
? FLAG_print_builtin_code
: (FLAG_print_code ||
(info->IsStub() && FLAG_print_code_stubs) ||
(info->IsOptimizing() && FLAG_print_opt_code));
if (print_code) {
base::SmartArrayPointer<char> debug_name = info->GetDebugName();
CodeTracer::Scope tracing_scope(info->isolate()->GetCodeTracer());
OFStream os(tracing_scope.file());
// Print the source code if available.
bool print_source =
info->parse_info() && (code->kind() == Code::OPTIMIZED_FUNCTION ||
code->kind() == Code::FUNCTION);
if (print_source) {
FunctionLiteral* literal = info->literal();
Handle<Script> script = info->script();
if (!script->IsUndefined() && !script->source()->IsUndefined()) {
os << "--- Raw source ---\n";
StringCharacterStream stream(String::cast(script->source()),
literal->start_position());
// fun->end_position() points to the last character in the stream. We
// need to compensate by adding one to calculate the length.
int source_len =
literal->end_position() - literal->start_position() + 1;
for (int i = 0; i < source_len; i++) {
if (stream.HasMore()) {
os << AsReversiblyEscapedUC16(stream.GetNext());
}
}
os << "\n\n";
}
}
if (info->IsOptimizing()) {
if (FLAG_print_unopt_code && info->parse_info()) {
os << "--- Unoptimized code ---\n";
info->closure()->shared()->code()->Disassemble(debug_name.get(), os);
}
os << "--- Optimized code ---\n"
<< "optimization_id = " << info->optimization_id() << "\n";
} else {
os << "--- Code ---\n";
}
if (print_source) {
FunctionLiteral* literal = info->literal();
os << "source_position = " << literal->start_position() << "\n";
}
code->Disassemble(debug_name.get(), os);
os << "--- End code ---\n";
}
#endif // ENABLE_DISASSEMBLER
}
} // namespace internal
} // namespace v8
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