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Use native shift instructions in ABIFunctions on Constantinople

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This commit is contained in:
Alex Beregszaszi 2018-04-05 16:56:02 +02:00
parent 22bfd3da41
commit c3608eaf90
3 changed files with 70 additions and 26 deletions
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87
libsolidity/codegen/ABIFunctions.cpp
View File

@ -1401,37 +1401,74 @@ string ABIFunctions::copyToMemoryFunction(bool _fromCalldata)
string ABIFunctions::shiftLeftFunction(size_t _numBits)
{
solAssert(_numBits < 256, "");
string functionName = "shift_left_" + to_string(_numBits);
return createFunction(functionName, [&]() {
solAssert(_numBits < 256, "");
return
Whiskers(R"(
function <functionName>(value) -> newValue {
newValue := mul(value, <multiplier>)
}
)")
("functionName", functionName)
("multiplier", toCompactHexWithPrefix(u256(1) << _numBits))
.render();
});
if (m_evmVersion.hasBitwiseShifting())
{
return createFunction(functionName, [&]() {
return
Whiskers(R"(
function <functionName>(value) -> newValue {
newValue := shl(<numBits>, value)
}
)")
("functionName", functionName)
("numBits", to_string(_numBits))
.render();
});
}
else
{
return createFunction(functionName, [&]() {
return
Whiskers(R"(
function <functionName>(value) -> newValue {
newValue := mul(value, <multiplier>)
}
)")
("functionName", functionName)
("multiplier", toCompactHexWithPrefix(u256(1) << _numBits))
.render();
});
}
}
string ABIFunctions::shiftRightFunction(size_t _numBits, bool _signed)
{
solAssert(_numBits < 256, "");
string functionName = "shift_right_" + to_string(_numBits) + (_signed ? "_signed" : "_unsigned");
return createFunction(functionName, [&]() {
solAssert(_numBits < 256, "");
return
Whiskers(R"(
function <functionName>(value) -> newValue {
newValue := <div>(value, <multiplier>)
}
)")
("functionName", functionName)
("div", _signed ? "sdiv" : "div")
("multiplier", toCompactHexWithPrefix(u256(1) << _numBits))
.render();
});
if (m_evmVersion.hasBitwiseShifting())
{
return createFunction(functionName, [&]() {
return
Whiskers(R"(
function <functionName>(value) -> newValue {
newValue := <shiftOp>(<numBits>, value)
}
)")
("functionName", functionName)
("shiftOp", _signed ? "sar" : "shr")
("numBits", to_string(_numBits))
.render();
});
}
else
{
return createFunction(functionName, [&]() {
return
Whiskers(R"(
function <functionName>(value) -> newValue {
newValue := <div>(value, <multiplier>)
}
)")
("functionName", functionName)
("div", _signed ? "sdiv" : "div")
("multiplier", toCompactHexWithPrefix(u256(1) << _numBits))
.render();
});
}
}
string ABIFunctions::roundUpFunction()

6
libsolidity/codegen/ABIFunctions.h
View File

@ -22,6 +22,8 @@
#pragma once
#include <libsolidity/interface/EVMVersion.h>
#include <libsolidity/ast/ASTForward.h>
#include <vector>
@ -48,6 +50,8 @@ using TypePointers = std::vector<TypePointer>;
class ABIFunctions
{
public:
explicit ABIFunctions(EVMVersion _evmVersion = EVMVersion{}) : m_evmVersion(_evmVersion) {}
/// @returns name of an assembly function to ABI-encode values of @a _givenTypes
/// into memory, converting the types to @a _targetTypes on the fly.
/// Parameters are: <headStart> <value_n> ... <value_1>, i.e.
@ -225,6 +229,8 @@ private:
/// Map from function name to code for a multi-use function.
std::map<std::string, std::string> m_requestedFunctions;
EVMVersion m_evmVersion;
};
}

3
libsolidity/codegen/CompilerContext.h
View File

@ -55,7 +55,8 @@ public:
explicit CompilerContext(EVMVersion _evmVersion = EVMVersion{}, CompilerContext* _runtimeContext = nullptr):
m_asm(std::make_shared<eth::Assembly>()),
m_evmVersion(_evmVersion),
m_runtimeContext(_runtimeContext)
m_runtimeContext(_runtimeContext),
m_abiFunctions(m_evmVersion)
{
if (m_runtimeContext)
m_runtimeSub = size_t(m_asm->newSub(m_runtimeContext->m_asm).data());