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Improve heuristics for pruning parse versions based on errors

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* Rewrite the error cost comparison in terms of explicit, discrete
conditions.
* Allow merging versions have different error costs.
* Store the depth of each stack version since the last error. Use this
state to prevent incorrect merging.
* Sort the stack versions in order of preference and put a hard limit on
the version count.
This commit is contained in:
Max Brunsfeld 2017-06-29 14:58:20 -07:00
parent 445be0736a
commit 009d6d1534
9 changed files with 237 additions and 145 deletions
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6
src/runtime/stack.h
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@ -102,12 +102,18 @@ ErrorStatus ts_stack_error_status(const Stack *, StackVersion);
bool ts_stack_merge(Stack *, StackVersion, StackVersion);
bool ts_stack_can_merge(Stack *, StackVersion, StackVersion);
void ts_stack_force_merge(Stack *, StackVersion, StackVersion);
void ts_stack_halt(Stack *, StackVersion);
bool ts_stack_is_halted(Stack *, StackVersion);
void ts_stack_renumber_version(Stack *, StackVersion, StackVersion);
void ts_stack_swap_versions(Stack *, StackVersion, StackVersion);
StackVersion ts_stack_copy_version(Stack *, StackVersion);
/*