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947634f66f
A part of `SSAConstruction.getInstructionOperandDefinition` was more
expensive than it had to be. On a ChakraCore snapshot, this changes the
tuple counts from
3020569 ~2% {3} r40 = JOIN OperandTag::TUnmodeledUseOperand#f WITH Instruction::Instruction::getFunction_dispred#ff CARTESIAN PRODUCT OUTPUT FIELDS {Instruction::Instruction::getFunction_dispred#ff.<0>,OperandTag::TUnmodeledUseOperand#f.<0>,Instruction::Instruction::getFunction_dispred#ff.<1>}
62405 ~0% {3} r41 = JOIN r40 WITH Instruction::UnmodeledUseInstruction#class#fffffff ON r40.<0>=Instruction::UnmodeledUseInstruction#class#fffffff.<0> OUTPUT FIELDS {r40.<2>,r40.<1>,r40.<0>}
2868421 ~1% {3} r42 = JOIN r41 WITH Instruction::Instruction::getFunction_dispred#ff_10#join_rhs ON r41.<0>=Instruction::Instruction::getFunction_dispred#ff_10#join_rhs.<0> OUTPUT FIELDS {Instruction::Instruction::getFunction_dispred#ff_10#join_rhs.<1>,r41.<1>,r41.<2>}
62405 ~0% {3} r43 = JOIN r42 WITH Instruction::UnmodeledDefinitionInstruction#class#fffffff ON r42.<0>=Instruction::UnmodeledDefinitionInstruction#class#fffffff.<0> OUTPUT FIELDS {r42.<2>,r42.<1>,r42.<0>}
to
(0s) Starting to evaluate predicate SSAConstruction::Cached::getUnmodeledUseInstruction#ff
(0s) Tuple counts:
62405 ~0% {2} r1 = JOIN Instruction::UnmodeledUseInstruction#class#fffffff WITH Instruction::Instruction::getFunction_dispred#ff ON Instruction::UnmodeledUseInstruction#class#fffffff.<0>=Instruction::Instruction::getFunction_dispred#ff.<0> OUTPUT FIELDS {Instruction::Instruction::getFunction_dispred#ff.<1>,Instruction::Instruction::getFunction_dispred#ff.<0>}
return r1
...
75716 ~0% {3} r40 = JOIN OperandTag::TUnmodeledUseOperand#f WITH FunctionIR::FunctionIR::getUnmodeledDefinitionInstruction#ff CARTESIAN PRODUCT OUTPUT FIELDS {FunctionIR::FunctionIR::getUnmodeledDefinitionInstruction#ff.<0>,OperandTag::TUnmodeledUseOperand#f.<0>,FunctionIR::FunctionIR::getUnmodeledDefinitionInstruction#ff.<1>}
62405 ~0% {3} r41 = JOIN r40 WITH FunctionIR::FunctionIR::getUnmodeledUseInstruction#ff ON r40.<0>=FunctionIR::FunctionIR::getUnmodeledUseInstruction#ff.<0> OUTPUT FIELDS {FunctionIR::FunctionIR::getUnmodeledUseInstruction#ff.<1>,r40.<1>,r40.<2>}
Semmle QL
This open source repository contains the standard QL libraries and queries that power LGTM, and the other products that Semmle makes available to its customers worldwide.
How do I learn QL and run queries?
LGTM has extensive documentation on getting started with writing QL. You can use the interactive query console or the QL for Eclipse plugin to try out your queries on any open-source project that's currently being analyzed.
Contributing
We welcome contributions to our standard library and standard checks. Do you have an idea for a new check, or how to improve an existing query? Then please go ahead and open a pull request! Before you do, though, please take the time to read our contributing guidelines and QL style guide.
License
The LGTM queries are licensed under Apache License 2.0 by Semmle.