A new engine for Rust Bitcoin script evaluation#1
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RobinLinus merged 3 commits intoBitVM:masterfrom Apr 5, 2024
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I want to point out that there is a material change in the engine. Previously, the stat will consider the total number of bytes in the stack as well as the max length of a single stack element: let stack_size = self.stack.iter().chain(self.altstack.iter()).map(|i| i.len()).sum();
self.stats.max_stack_bytes = cmp::max(self.stats.max_stack_bytes, stack_size);
// NB since every item that ever gets on the altstack first gets on the stack,
// we don't have to look at the altstack here
let max_item = self.stack.iter().map(|i| i.len()).max().unwrap_or(0);
self.stats.max_stack_item_size = cmp::max(self.stats.max_stack_item_size, max_item);I think these two have caused slowdown and probably should be removed. Later, they may be substituted with a new method that does the stat when needed. |
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This engine is intended to improve the performance of script evaluation.
The main idea is to default the stack into a stack that represents signed 32-bit integers.
Some functions and interfaces need to be changed as well.