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Extract ConstantPool to iv/lv5/railgun/constant_pool.h
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| Original file line number | Diff line number | Diff line change |
|---|---|---|
| @@ -0,0 +1,179 @@ | ||
| #ifndef IV_LV5_RAILGUN_CONSTANT_POOL_H_ | ||
| #define IV_LV5_RAILGUN_CONSTANT_POOL_H_ | ||
| #include <iv/detail/cstdint.h> | ||
| #include <iv/detail/unordered_map.h> | ||
| #include <iv/detail/functional.h> | ||
| #include <iv/ustring.h> | ||
| #include <iv/utils.h> | ||
| #include <iv/lv5/jsval_fwd.h> | ||
| #include <iv/lv5/jsstring_fwd.h> | ||
| #include <iv/lv5/error.h> | ||
| #include <iv/lv5/railgun/context_fwd.h> | ||
| #include <iv/lv5/railgun/code.h> | ||
| namespace iv { | ||
| namespace lv5 { | ||
| namespace railgun { | ||
|
|
||
| class ConstantPool { | ||
| // Bytecode register size is very limited. | ||
| // So probably, constant register may be overflown sometimes. | ||
| // When constant register is overflown, we can use LOAD_CONST instead of | ||
| // constant register. | ||
| public: | ||
| static const uint32_t kEmpty = UINT32_MAX; | ||
|
|
||
| typedef std::unordered_map<core::UString, int32_t> JSStringToIndexMap; | ||
| typedef std::unordered_map< | ||
| double, | ||
| int32_t, | ||
| std::hash<double>, JSDoubleEquals> JSDoubleToIndexMap; | ||
|
|
||
| ConstantPool(Context* ctx) | ||
| : ctx_(ctx), | ||
| code_(NULL), | ||
| jsstring_to_index_map_(), | ||
| double_to_index_map_(), | ||
| undefined_index_(), | ||
| null_index_(), | ||
| true_index_(), | ||
| false_index_(), | ||
| empty_index_() { | ||
| } | ||
|
|
||
| void Init(Code* code) { | ||
| code_ = code; | ||
| jsstring_to_index_map_.clear(); | ||
| double_to_index_map_.clear(); | ||
| undefined_index_ = kEmpty; | ||
| null_index_ = kEmpty; | ||
| true_index_ = kEmpty; | ||
| false_index_ = kEmpty; | ||
| empty_index_ = kEmpty; | ||
| } | ||
|
|
||
| uint32_t undefined_index() { | ||
| if (undefined_index_ != kEmpty) { | ||
| return undefined_index_; | ||
| } | ||
| undefined_index_ = AddConstant(JSUndefined); | ||
| return undefined_index_; | ||
| } | ||
|
|
||
| uint32_t null_index() { | ||
| if (null_index_ != kEmpty) { | ||
| return null_index_; | ||
| } | ||
| null_index_ = AddConstant(JSNull); | ||
| return null_index_; | ||
| } | ||
|
|
||
| uint32_t true_index() { | ||
| if (true_index_ != kEmpty) { | ||
| return true_index_; | ||
| } | ||
| true_index_ = AddConstant(JSTrue); | ||
| return true_index_; | ||
| } | ||
|
|
||
| uint32_t false_index() { | ||
| if (false_index_ != kEmpty) { | ||
| return false_index_; | ||
| } | ||
| false_index_ = AddConstant(JSFalse); | ||
| return false_index_; | ||
| } | ||
|
|
||
| uint32_t empty_index() { | ||
| if (empty_index_ != kEmpty) { | ||
| return empty_index_; | ||
| } | ||
| empty_index_ = AddConstant(JSEmpty); | ||
| return empty_index_; | ||
| } | ||
|
|
||
| uint32_t string_index(const core::UString& str) { | ||
| const JSStringToIndexMap::const_iterator it = | ||
| jsstring_to_index_map_.find(str); | ||
|
|
||
| if (it != jsstring_to_index_map_.end()) { | ||
| // duplicate constant | ||
| return it->second; | ||
| } | ||
|
|
||
| // new constant value | ||
| Error::Dummy dummy; | ||
| const uint32_t index = AddConstant( | ||
| JSString::New( | ||
| ctx_, | ||
| str.begin(), | ||
| str.end(), | ||
| core::character::IsASCII(str.begin(), str.end()), &dummy)); | ||
| jsstring_to_index_map_.insert(std::make_pair(str, index)); | ||
| return index; | ||
| } | ||
|
|
||
| uint32_t string_index(const StringLiteral* str) { | ||
| return string_index(core::ToUString(str->value())); | ||
| } | ||
|
|
||
| uint32_t string_index(const core::StringPiece& str) { | ||
| return string_index(core::ToUString(str)); | ||
| } | ||
|
|
||
| uint32_t string_index(const core::UStringPiece& str) { | ||
| return string_index(core::UString(str)); | ||
| } | ||
|
|
||
| uint32_t number_index(double val) { | ||
| const JSDoubleToIndexMap::const_iterator it = | ||
| double_to_index_map_.find(val); | ||
|
|
||
| if (it != double_to_index_map_.end()) { | ||
| // duplicate constant pool | ||
| return it->second; | ||
| } | ||
|
|
||
| // new constant value | ||
| const uint32_t index = AddConstant(val); | ||
| double_to_index_map_.insert(std::make_pair(val, index)); | ||
| return index; | ||
| } | ||
|
|
||
| uint32_t Lookup(JSVal constant) { | ||
| if (constant.IsString()) { | ||
| return string_index(constant.string()->GetUString()); | ||
| } else if (constant.IsNumber()) { | ||
| return number_index(constant.number()); | ||
| } else if (constant.IsUndefined()) { | ||
| return undefined_index(); | ||
| } else if (constant.IsNull()) { | ||
| return null_index(); | ||
| } else if (constant.IsBoolean()) { | ||
| return (constant.boolean()) ? true_index() : false_index(); | ||
| } else if (constant.IsEmpty()) { | ||
| return empty_index(); | ||
| } | ||
| UNREACHABLE(); | ||
| return 0; // makes compiler happy | ||
| } | ||
|
|
||
| private: | ||
| uint32_t AddConstant(JSVal value) { | ||
| const uint32_t result = code_->constants().size(); | ||
| code_->constants_.push_back(value); | ||
| return result; | ||
| } | ||
|
|
||
| Context* ctx_; | ||
| Code* code_; | ||
| JSStringToIndexMap jsstring_to_index_map_; | ||
| JSDoubleToIndexMap double_to_index_map_; | ||
| uint32_t undefined_index_; | ||
| uint32_t null_index_; | ||
| uint32_t true_index_; | ||
| uint32_t false_index_; | ||
| uint32_t empty_index_; | ||
| }; | ||
|
|
||
| } } } // namespace iv::lv5::railgun | ||
| #endif // IV_LV5_RAILGUN_CONSTANT_POOL_H_ |
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