cerc-io/solidity
11
0
Fork 0
mirror of https://github.com/ethereum/solidity synced 2023-10-03 13:03:40 +00:00
Code Issues Actions Packages Projects Releases Wiki Activity

Review comments.

Browse Source
This commit is contained in:
chriseth
2019-02-25 11:58:37 +01:00
parent 5eb155b894
commit 0e471ab811
3 changed files with 19 additions and 12 deletions
Download Patch File Download Diff File Expand all files Collapse all files
test/tools/yulInterpreter/EVMInstructionInterpreter.cpp
+12 -5
View File
@@ -50,6 +50,9 @@ u256 exp256(u256 _base, u256 _exponent)
return result;
}
/// Reads 32 bytes from @a _data at position @a _offset bytes while
/// interpreting @a _data to be padded with an infinite number of zero
/// bytes beyond its end.
u256 readZeroExtended(bytes const& _data, u256 const& _offset)
{
if (_offset >= _data.size())
@@ -70,6 +73,10 @@ u256 readZeroExtended(bytes const& _data, u256 const& _offset)
}
}
/// Copy @a _size bytes of @a _source at offset @a _sourceOffset to
/// @a _target at offset @a _targetOffset. Behaves as if @a _source would
/// continue with an infinite sequence of zero bytes beyond its end.
/// Asserts the target is large enough to hold the copied segment.
void copyZeroExtended(
bytes& _target, bytes const& _source,
size_t _targetOffset, size_t _sourceOffset, size_t _size
@@ -137,11 +144,11 @@ u256 EVMInstructionInterpreter::eval(
case Instruction::XOR:
return arg[0] ^ arg[1];
case Instruction::BYTE:
return arg[0] >= 32 ? 0 : (arg[1] >> unsigned(8 * (31 - (arg[0] & 0xff)))) & 0xff;
return arg[0] >= 32 ? 0 : (arg[1] >> unsigned(8 * (31 - arg[0]))) & 0xff;
case Instruction::SHL:
return arg[0] > 255 ? 0 : (arg[1] << unsigned(arg[0] & 0xff));
return arg[0] > 255 ? 0 : (arg[1] << unsigned(arg[0]));
case Instruction::SHR:
return arg[0] > 255 ? 0 : (arg[1] >> unsigned(arg[0] & 0xff));
return arg[0] > 255 ? 0 : (arg[1] >> unsigned(arg[0]));
case Instruction::SAR:
{
static u256 const hibit = u256(1) << 255;
@@ -149,7 +156,7 @@ u256 EVMInstructionInterpreter::eval(
return arg[1] & hibit ? u256(-1) : 0;
else
{
unsigned amount = unsigned(arg[0] & 0xff);
unsigned amount = unsigned(arg[0]);
u256 v = arg[1] >> amount;
if (arg[1] & hibit)
v |= u256(-1) << (256 - amount);
@@ -165,7 +172,7 @@ u256 EVMInstructionInterpreter::eval(
return arg[0];
else
{
unsigned testBit = unsigned(arg[0] & 0xff) * 8 + 7;
unsigned testBit = unsigned(arg[0]) * 8 + 7;
u256 ret = arg[1];
u256 mask = ((u256(1) << testBit) - 1);
if (boost::multiprecision::bit_test(ret, testBit))