1  #include "Instruction.h"
 2  
 3  #include "preprocessor/llvm_includes_start.h"
 4  #include <llvm/ADT/APInt.h>
 5  #include "preprocessor/llvm_includes_end.h"
 6  
 7  namespace dev
 8  {
 9  namespace evmjit
10  {
11  
12  llvm::APInt readPushData(code_iterator& _curr, code_iterator _end)
13  {
14  	auto pushInst = *_curr;
15  	assert(Instruction(pushInst) >= Instruction::PUSH1 && Instruction(pushInst) <= Instruction::PUSH32);
16  	auto numBytes = pushInst - static_cast<size_t>(Instruction::PUSH1) + 1;
17  	llvm::APInt value(256, 0);
18  	++_curr;	// Point the data
19  	for (decltype(numBytes) i = 0; i < numBytes; ++i)
20  	{
21  		byte b = (_curr != _end) ? *_curr++ : 0;
22  		value <<= 8;
23  		value |= b;
24  	}
25  	--_curr;	// Point the last real byte read
26  	return value;
27  }
28  
29  void skipPushData(code_iterator& _curr, code_iterator _end)
30  {
31  	auto pushInst = *_curr;
32  	assert(Instruction(pushInst) >= Instruction::PUSH1 && Instruction(pushInst) <= Instruction::PUSH32);
33  	auto numBytes = pushInst - static_cast<size_t>(Instruction::PUSH1) + 1;
34  	--_end;
35  	for (decltype(numBytes) i = 0; i < numBytes && _curr < _end; ++i, ++_curr) {}
36  }
37  
38  }
39  }