diff options
Diffstat (limited to 'src/script/script.h')
| -rw-r--r-- | src/script/script.h | 45 |
1 files changed, 35 insertions, 10 deletions
diff --git a/src/script/script.h b/src/script/script.h index 654dff4625..2a92060543 100644 --- a/src/script/script.h +++ b/src/script/script.h @@ -8,6 +8,7 @@ #include "crypto/common.h" #include "prevector.h" +#include "serialize.h" #include <assert.h> #include <climits> @@ -30,6 +31,9 @@ static const int MAX_PUBKEYS_PER_MULTISIG = 20; // Maximum script length in bytes static const int MAX_SCRIPT_SIZE = 10000; +// Maximum number of values on script interpreter stack +static const int MAX_STACK_SIZE = 1000; + // Threshold for nLockTime: below this value it is interpreted as block number, // otherwise as UNIX timestamp. static const unsigned int LOCKTIME_THRESHOLD = 500000000; // Tue Nov 5 00:53:20 1985 UTC @@ -187,6 +191,9 @@ enum opcodetype OP_INVALIDOPCODE = 0xff, }; +// Maximum value that an opcode can be +static const unsigned int MAX_OPCODE = OP_NOP10; + const char* GetOpName(opcodetype opcode); class scriptnum_error : public std::runtime_error @@ -370,6 +377,12 @@ private: int64_t m_value; }; +/** + * We use a prevector for the script to reduce the considerable memory overhead + * of vectors in cases where they normally contain a small number of small elements. + * Tests in October 2015 showed use of this reduced dbcache memory usage by 23% + * and made an initial sync 13% faster. + */ typedef prevector<28, unsigned char> CScriptBase; /** Serialized script, used inside transaction inputs and outputs */ @@ -398,8 +411,16 @@ public: CScript(std::vector<unsigned char>::const_iterator pbegin, std::vector<unsigned char>::const_iterator pend) : CScriptBase(pbegin, pend) { } CScript(const unsigned char* pbegin, const unsigned char* pend) : CScriptBase(pbegin, pend) { } + ADD_SERIALIZE_METHODS; + + template <typename Stream, typename Operation> + inline void SerializationOp(Stream& s, Operation ser_action) { + READWRITE(static_cast<CScriptBase&>(*this)); + } + CScript& operator+=(const CScript& b) { + reserve(size() + b.size()); insert(end(), b.begin(), b.end()); return *this; } @@ -448,16 +469,16 @@ public: else if (b.size() <= 0xffff) { insert(end(), OP_PUSHDATA2); - uint8_t data[2]; - WriteLE16(data, b.size()); - insert(end(), data, data + sizeof(data)); + uint8_t _data[2]; + WriteLE16(_data, b.size()); + insert(end(), _data, _data + sizeof(_data)); } else { insert(end(), OP_PUSHDATA4); - uint8_t data[4]; - WriteLE32(data, b.size()); - insert(end(), data, data + sizeof(data)); + uint8_t _data[4]; + WriteLE32(_data, b.size()); + insert(end(), _data, _data + sizeof(_data)); } insert(end(), b.begin(), b.end()); return *this; @@ -484,7 +505,7 @@ public: bool GetOp(iterator& pc, opcodetype& opcodeRet) { const_iterator pc2 = pc; - bool fRet = GetOp2(pc2, opcodeRet, NULL); + bool fRet = GetOp2(pc2, opcodeRet, nullptr); pc = begin() + (pc2 - begin()); return fRet; } @@ -496,7 +517,7 @@ public: bool GetOp(const_iterator& pc, opcodetype& opcodeRet) const { - return GetOp2(pc, opcodeRet, NULL); + return GetOp2(pc, opcodeRet, nullptr); } bool GetOp2(const_iterator& pc, opcodetype& opcodeRet, std::vector<unsigned char>* pvchRet) const @@ -627,6 +648,9 @@ public: bool IsPushOnly(const_iterator pc) const; bool IsPushOnly() const; + /** Check if the script contains valid OP_CODES */ + bool HasValidOps() const; + /** * Returns whether the script is guaranteed to fail at execution, * regardless of the initial stack. This allows outputs to be pruned @@ -639,8 +663,9 @@ public: void clear() { - // The default std::vector::clear() does not release memory. - CScriptBase().swap(*this); + // The default prevector::clear() does not release memory + CScriptBase::clear(); + shrink_to_fit(); } }; |