The constraints on compute power a program can consume is limited only to its instruction count (bp #11717) (#11800)

* The constraints on compute power a program can consume is limited only to its instruction count (#11717)

(cherry picked from commit 8d362f682b)

# Conflicts:
#	programs/bpf/Cargo.toml
#	programs/bpf_loader/Cargo.toml
#	programs/bpf_loader/src/lib.rs
#	programs/bpf_loader/src/syscalls.rs
#	runtime/src/bank.rs
#	sdk/src/instruction.rs

* Resolve conflicts

* nudge

Co-authored-by: Jack May <jack@solana.com>

sdk/src/entrypoint_native.rs

@@ -199,6 +199,16 @@ pub trait InvokeContext {
     fn get_logger(&self) -> Rc<RefCell<dyn Logger>>;
     /// Are cross program invocations supported
     fn is_cross_program_supported(&self) -> bool;
+    /// Get this invocation's compute meter
+    fn get_compute_meter(&self) -> Rc<RefCell<dyn ComputeMeter>>;
+}
+
+/// Compute meter
+pub trait ComputeMeter {
+    /// Consume compute units
+    fn consume(&mut self, amount: u64) -> Result<(), InstructionError>;
+    /// Get the number of remaining compute units
+    fn get_remaining(&self) -> u64;
 }
 
 /// Log messages

sdk/src/instruction.rs

@@ -159,6 +159,14 @@ pub enum InstructionError {
     /// Provided seeds do not result in a valid address
     #[error("Provided seeds do not result in a valid address")]
     InvalidSeeds,
+
+    /// Failed to reallocate account data of this length
+    #[error("Failed to reallocate account data")]
+    InvalidRealloc,
+
+    /// Computational budget exceeded
+    #[error("Computational budget exceeded")]
+    ComputationalBudgetExceeded,
 }
 
 impl InstructionError {