pit: Add fuel economy

1 files changed, 2 insertions, 0 deletions

diff --git a/pit/include/lcq/pit/runtime.h b/pit/include/lcq/pit/runtime.h
index feeb267..96d0351 100644
--- a/pit/include/lcq/pit/runtime.h
+++ b/pit/include/lcq/pit/runtime.h
@@ -98,6 +98,7 @@ typedef struct pit_runtime {
     pit_vec(pit_traversal_entry) *traversal; /* intermediate stack used during tree traversal */
     pit_vec(pit_callstack_entry) *callstack; /* stack of enclosing function calls */
     /* bookkeeping */
+    i64 fuel; /* fuel total - ignored if negative. decrements on each instruction executed. */
     /* "frozen" values offsets: values before these offsets are immutable, and we can reset here later */
     i64 frozen_values, frozen_symtab;
     pit_value error; /* error value - if this is non-nil, an error has occured! only tracks the first error */
@@ -108,6 +109,7 @@ typedef struct pit_runtime {
 } pit_runtime;
 pit_runtime *pit_runtime_new(u8 *buf, i64 len);
 
+void pit_runtime_set_fuel(pit_runtime *rt, i64 fuel);
 void pit_runtime_freeze(pit_runtime *rt); /* freeze the runtime at the current point - everything currently defined becomes immutable */
 void pit_runtime_reset(pit_runtime *rt); /* restore the runtime to the frozen point, resetting everything that has happened since */
 bool pit_runtime_print_error(pit_runtime *rt); /* return true if an error has occured, and print to stderr */