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Make Yul optimizer not fail for wasm.

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chriseth
2019-06-17 18:42:47 +02:00
parent 8260ae1397
commit 6cb6fe35ef
17 changed files with 321 additions and 210 deletions
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libyul/optimiser/Metrics.h
-72
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@@ -22,9 +22,6 @@
#include <libyul/optimiser/ASTWalker.h>
#include <liblangutil/EVMVersion.h>
#include <libevmasm/Instruction.h>
#include <libevmasm/Instruction.h>
namespace yul
{
@@ -96,75 +93,6 @@ private:
size_t m_cost = 0;
};
/**
* Gas meter for expressions only involving literals, identifiers and
* EVM instructions.
*
* Assumes that EXP is not used with exponents larger than a single byte.
* Is not particularly exact for anything apart from arithmetic.
*/
class GasMeter
{
public:
GasMeter(EVMDialect const& _dialect, bool _isCreation, size_t _runs):
m_dialect(_dialect),
m_isCreation{_isCreation},
m_runs(_runs)
{}
/// @returns the full combined costs of deploying and evaluating the expression.
size_t costs(Expression const& _expression) const;
/// @returns the combined costs of deploying and running the instruction, not including
/// the costs for its arguments.
size_t instructionCosts(dev::eth::Instruction _instruction) const;
private:
size_t combineCosts(std::pair<size_t, size_t> _costs) const;
EVMDialect const& m_dialect;
bool m_isCreation = false;
size_t m_runs;
};
class GasMeterVisitor: public ASTWalker
{
public:
static std::pair<size_t, size_t> costs(
Expression const& _expression,
EVMDialect const& _dialect,
bool _isCreation
);
static std::pair<size_t, size_t> instructionCosts(
dev::eth::Instruction _instruction,
EVMDialect const& _dialect,
bool _isCreation = false
);
public:
GasMeterVisitor(EVMDialect const& _dialect, bool _isCreation):
m_dialect(_dialect),
m_isCreation{_isCreation}
{}
void operator()(FunctionCall const& _funCall) override;
void operator()(FunctionalInstruction const& _instr) override;
void operator()(Literal const& _literal) override;
void operator()(Identifier const& _identifier) override;
private:
size_t singleByteDataGas() const;
/// Computes the cost of storing and executing the single instruction (excluding its arguments).
/// For EXP, it assumes that the exponent is at most 255.
/// Does not work particularly exact for anything apart from arithmetic.
void instructionCostsInternal(dev::eth::Instruction _instruction);
EVMDialect const& m_dialect;
bool m_isCreation = false;
size_t m_runGas = 0;
size_t m_dataGas = 0;
};
/**
* Counts the number of assignments to every variable.
* Only works after running the Disambiguator.