Enable floats but prohibit some CPU architectures (#1941) (#2079)

* Enable floats but prohibit some CPU architectures * Merge branch 'staging' into enable_floats * Merge refs/heads/staging into enable_floats * Avoid overflowing u32 during contract preparation (#1946) * Update runtime/near-vm-runner/src/runner.rs Co-Authored-By: Evgeny Kuzyakov <[email protected]> * Merge branch 'staging' into enable_floats * Nit Co-authored-by: Maksym Zavershynskyi <[email protected]>
near · Feb 4, 2020 · 4bc4b74 · 4bc4b74
1 parent a550642
commit 4bc4b74
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Showing 3 changed files with 9 additions and 4 deletions.
diff --git a/runtime/near-vm-logic/src/logic.rs b/runtime/near-vm-logic/src/logic.rs
@@ -653,7 +653,8 @@ impl<'a> VMLogic<'a> {
     /// * If we exceed usage limit imposed on burnt gas returns `GasLimitExceeded`;
     /// * If we exceed the `prepaid_gas` then returns `GasExceeded`.
     pub fn gas(&mut self, gas_amount: u32) -> Result<()> {
-        self.gas_counter.deduct_gas(Gas::from(gas_amount), Gas::from(gas_amount))
+        let value = Gas::from(gas_amount) * Gas::from(self.config.regular_op_cost);
+        self.gas_counter.deduct_gas(value, value)
     }
 
     // ################

diff --git a/runtime/near-vm-runner/src/prepare.rs b/runtime/near-vm-runner/src/prepare.rs
@@ -56,9 +56,7 @@ impl<'a> ContractModule<'a> {
 
     fn inject_gas_metering(self) -> Result<Self, PrepareError> {
         let Self { module, config } = self;
-        let gas_rules = rules::Set::new(config.regular_op_cost, Default::default())
-            .with_forbidden_floats()
-            .with_grow_cost(config.grow_mem_cost);
+        let gas_rules = rules::Set::new(1, Default::default()).with_grow_cost(config.grow_mem_cost);
         let module = pwasm_utils::inject_gas_counter(module, &gas_rules)
             .map_err(|_| PrepareError::GasInstrumentation)?;
         Ok(Self { module, config })

diff --git a/runtime/near-vm-runner/src/runner.rs b/runtime/near-vm-runner/src/runner.rs
@@ -48,6 +48,12 @@ pub fn run<'a>(
     fees_config: &'a RuntimeFeesConfig,
     promise_results: &'a [PromiseResult],
 ) -> (Option<VMOutcome>, Option<VMError>) {
+    if !cfg!(target_arch = "x86") && !cfg!(target_arch = "x86_64") {
+        // TODO(#1940): Remove once NaN is standardized by the VM.
+        panic!(
+            "Execution of smart contracts is only supported for x86 and x86_64 CPU architectures."
+        );
+    }
     if method_name.is_empty() {
         return (
             None,