runtime-numbers.cc

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// Copyright 2014 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/execution/arguments-inl.h"
#include "src/execution/isolate-inl.h"
#include "src/heap/heap-inl.h"  // For ToBoolean. TODO(jkummerow): Drop.
#include "src/runtime/runtime-utils.h"
 
namespace v8 {
namespace internal {
 
RUNTIME_FUNCTION(Runtime_StringToNumber) {
  // When this is called from Wasm code, clear the "thread in wasm" flag,
  // which is important in case any GC needs to happen.
  // TODO(40192807): Find a better fix, likely by replacing the global flag.
  SaveAndClearThreadInWasmFlag clear_wasm_flag(isolate);
 
  HandleScope handle_scope(isolate);
  DCHECK_EQ(1, args.length());
  Handle<String> subject = args.at<String>(0);
  return *String::ToNumber(isolate, subject);
}
 
 
// ES6 18.2.5 parseInt(string, radix) slow path
RUNTIME_FUNCTION(Runtime_StringParseInt) {
  HandleScope handle_scope(isolate);
  DCHECK_EQ(2, args.length());
  Handle<Object> string = args.at(0);
  Handle<Object> radix = args.at(1);
 
  // Convert {string} to a String first, and flatten it.
  Handle<String> subject;
  ASSIGN_RETURN_FAILURE_ON_EXCEPTION(isolate, subject,
                                     Object::ToString(isolate, string));
  subject = String::Flatten(isolate, subject);
 
  // Convert {radix} to Int32.
  if (!IsNumber(*radix)) {
    ASSIGN_RETURN_FAILURE_ON_EXCEPTION(isolate, radix,
                                       Object::ToNumber(isolate, radix));
  }
  int radix32 = DoubleToInt32(Object::NumberValue(*radix));
  if (radix32 != 0 && (radix32 < 2 || radix32 > 36)) {
    return ReadOnlyRoots(isolate).nan_value();
  }
 
  double result = StringToInt(isolate, subject, radix32);
  return *isolate->factory()->NewNumber(result);
}
 
 
// ES6 18.2.4 parseFloat(string)
RUNTIME_FUNCTION(Runtime_StringParseFloat) {
  HandleScope shs(isolate);
  DCHECK_EQ(1, args.length());
  DirectHandle<String> subject = args.at<String>(0);
 
  double value = StringToDouble(isolate, subject, ALLOW_TRAILING_JUNK,
                                std::numeric_limits<double>::quiet_NaN());
 
  return *isolate->factory()->NewNumber(value);
}
 
RUNTIME_FUNCTION(Runtime_NumberToStringSlow) {
  // When this is called from Wasm code, clear the "thread in wasm" flag,
  // which is important in case any GC needs to happen.
  // TODO(40192807): Find a better fix, likely by replacing the global flag.
  SaveAndClearThreadInWasmFlag clear_wasm_flag(isolate);
 
  HandleScope scope(isolate);
  DCHECK_EQ(1, args.length());
  return *isolate->factory()->NumberToString(args.at(0),
                                             NumberCacheMode::kSetOnly);
}
 
RUNTIME_FUNCTION(Runtime_MaxSmi) {
  SealHandleScope shs(isolate);
  DCHECK_EQ(0, args.length());
  return Smi::FromInt(Smi::kMaxValue);
}
 
 
RUNTIME_FUNCTION(Runtime_IsSmi) {
  SealHandleScope shs(isolate);
  DCHECK_EQ(1, args.length());
  Tagged<Object> obj = args[0];
  return isolate->heap()->ToBoolean(IsSmi(obj));
}
 
 
RUNTIME_FUNCTION(Runtime_GetHoleNaNUpper) {
  HandleScope scope(isolate);
  DCHECK_EQ(0, args.length());
  return *isolate->factory()->NewNumberFromUint(kHoleNanUpper32);
}
 
 
RUNTIME_FUNCTION(Runtime_GetHoleNaNLower) {
  HandleScope scope(isolate);
  DCHECK_EQ(0, args.length());
  return *isolate->factory()->NewNumberFromUint(kHoleNanLower32);
}
 
}  // namespace internal
}  // namespace v8