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OptimiserSuite: Use string_view instead of string for step sequences

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This commit is contained in:
Kamil Śliwak 2021-10-06 16:44:29 +02:00
parent 79d9d5bf0d
commit 2fb8f1be5b
2 changed files with 17 additions and 19 deletions
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27
libyul/optimiser/Suite.cpp
View File

@ -89,7 +89,7 @@ void OptimiserSuite::run(
GasMeter const* _meter,
Object& _object,
bool _optimizeStackAllocation,
string const& _optimisationSequence,
string_view _optimisationSequence,
optional<size_t> _expectedExecutionsPerDeployment,
set<YulString> const& _externallyUsedIdentifiers
)
@ -269,7 +269,7 @@ map<char, string> const& OptimiserSuite::stepAbbreviationToNameMap()
return lookupTable;
}
void OptimiserSuite::validateSequence(string const& _stepAbbreviations)
void OptimiserSuite::validateSequence(string_view _stepAbbreviations)
{
int8_t nestingLevel = 0;
for (char abbreviation: _stepAbbreviations)
@ -308,18 +308,15 @@ void OptimiserSuite::validateSequence(string const& _stepAbbreviations)
assertThrow(nestingLevel == 0, OptimizerException, "Unbalanced brackets");
}
void OptimiserSuite::runSequence(string const& _stepAbbreviations, Block& _ast)
void OptimiserSuite::runSequence(string_view _stepAbbreviations, Block& _ast)
{
validateSequence(_stepAbbreviations);
string input = _stepAbbreviations;
ranges::actions::remove(input, ' ');
ranges::actions::remove(input, '\n');
auto abbreviationsToSteps = [](string const& _sequence) -> vector<string>
auto abbreviationsToSteps = [](string_view _sequence) -> vector<string>
{
vector<string> steps;
for (char abbreviation: _sequence)
if (abbreviation != ' ' && abbreviation != '\n')
steps.emplace_back(stepAbbreviationToNameMap().at(abbreviation));
return steps;
};
@ -328,17 +325,17 @@ void OptimiserSuite::runSequence(string const& _stepAbbreviations, Block& _ast)
// `aaa` or `[bbb]` can be empty. For example we consider a sequence like `fgo[aaf]Oo` to have
// four segments, the last of which is an empty bracket.
size_t currentPairStart = 0;
while (currentPairStart < input.size())
while (currentPairStart < _stepAbbreviations.size())
{
size_t openingBracket = input.find('[', currentPairStart);
size_t closingBracket = input.find(']', openingBracket);
size_t firstCharInside = (openingBracket == string::npos ? input.size() : openingBracket + 1);
size_t openingBracket = _stepAbbreviations.find('[', currentPairStart);
size_t closingBracket = _stepAbbreviations.find(']', openingBracket);
size_t firstCharInside = (openingBracket == string::npos ? _stepAbbreviations.size() : openingBracket + 1);
yulAssert((openingBracket == string::npos) == (closingBracket == string::npos), "");
runSequence(abbreviationsToSteps(input.substr(currentPairStart, openingBracket - currentPairStart)), _ast);
runSequenceUntilStable(abbreviationsToSteps(input.substr(firstCharInside, closingBracket - firstCharInside)), _ast);
runSequence(abbreviationsToSteps(_stepAbbreviations.substr(currentPairStart, openingBracket - currentPairStart)), _ast);
runSequenceUntilStable(abbreviationsToSteps(_stepAbbreviations.substr(firstCharInside, closingBracket - firstCharInside)), _ast);
currentPairStart = (closingBracket == string::npos ? input.size() : closingBracket + 1);
currentPairStart = (closingBracket == string::npos ? _stepAbbreviations.size() : closingBracket + 1);
}
}

7
libyul/optimiser/Suite.h
View File

@ -29,6 +29,7 @@
#include <set>
#include <string>
#include <string_view>
#include <memory>
namespace solidity::yul
@ -64,17 +65,17 @@ public:
GasMeter const* _meter,
Object& _object,
bool _optimizeStackAllocation,
std::string const& _optimisationSequence,
std::string_view _optimisationSequence,
std::optional<size_t> _expectedExecutionsPerDeployment,
std::set<YulString> const& _externallyUsedIdentifiers = {}
);
/// Ensures that specified sequence of step abbreviations is well-formed and can be executed.
/// @throw OptimizerException if the sequence is invalid
static void validateSequence(std::string const& _stepAbbreviations);
static void validateSequence(std::string_view _stepAbbreviations);
void runSequence(std::vector<std::string> const& _steps, Block& _ast);
void runSequence(std::string const& _stepAbbreviations, Block& _ast);
void runSequence(std::string_view _stepAbbreviations, Block& _ast);
void runSequenceUntilStable(
std::vector<std::string> const& _steps,
Block& _ast,