Trivially encoded types

docs/book/src/reference/compiler_intrinsics.md

@@ -408,3 +408,30 @@ on real nodes and it only increases gas usage.
 **Constraints:**
 
 - `T` must implement Debug
+
+---
+
+```sway
+__transmute<A, B>(src: A) -> B
+```
+
+**Description:** Reinterprets the bits of a value of one type as another type.
+
+**Constraints:** A and B must have the exactly same size.
+
+---
+
+```sway
+__runtime_mem_id<T>() -> u64
+__encoding_mem_id<T>() -> u64
+```
+
+**Description:** Returns an opaque number that identifies the memory representation of a type. No information is conveyed by this number and should only be compared for equality.
+
+This number is not guaranteed to be stable on different compiler versions.
+
+`__runtime_mem_id` represents how the type is represented inside the VM.
+
+`__encoding_mem_id` represents how the type is encoded. It returns 0 when a type does not have encoding representation.
+
+**Constraints:** None

forc-plugins/forc-client/tests/deploy.rs

@@ -377,7 +377,7 @@ async fn test_simple_deploy() {
     node.kill().unwrap();
     let expected = vec![DeployedPackage::Contract(DeployedContract {
         id: ContractId::from_str(
-            "307a59fbb6888da41942653ca21d9c71e06d72edb58b8d775eea87c7e755ebdb",
+            "e3e0f5c8c9585a7dc6673775a73104acc847905b5e7ea085db822241444fee7e",
         )
         .unwrap(),
         proxy: None,
@@ -421,7 +421,7 @@ async fn test_deploy_submit_only() {
     node.kill().unwrap();
     let expected = vec![DeployedPackage::Contract(DeployedContract {
         id: ContractId::from_str(
-            "307a59fbb6888da41942653ca21d9c71e06d72edb58b8d775eea87c7e755ebdb",
+            "e3e0f5c8c9585a7dc6673775a73104acc847905b5e7ea085db822241444fee7e",
         )
         .unwrap(),
         proxy: None,
@@ -468,12 +468,12 @@ async fn test_deploy_fresh_proxy() {
     node.kill().unwrap();
     let impl_contract = DeployedPackage::Contract(DeployedContract {
         id: ContractId::from_str(
-            "307a59fbb6888da41942653ca21d9c71e06d72edb58b8d775eea87c7e755ebdb",
+            "e3e0f5c8c9585a7dc6673775a73104acc847905b5e7ea085db822241444fee7e",
         )
         .unwrap(),
         proxy: Some(
             ContractId::from_str(
-                "70a447780b00c9725859bbef1cd327a9455cc62fbe607a0524b2c82a5846f5a9",
+                "92343c25e373958aee4cecfe58ab6533261b5f54de471291c22ee05182d39122",
             )
             .unwrap(),
         ),

forc/tests/cli_integration.rs

@@ -51,10 +51,10 @@ fn test_forc_test_raw_logs() -> Result<(), rexpect::error::Error> {
     // Assert that the output is correct
     process.exp_string("      test test_log_4")?;
     process.exp_string("raw logs:")?;
-    process.exp_string(r#"[{"LogData":{"data":"0000000000000004","digest":"8005f02d43fa06e7d0585fb64c961d57e318b27a145c857bcd3a6bdb413ff7fc","id":"0000000000000000000000000000000000000000000000000000000000000000","is":10368,"len":8,"pc":12044,"ptr":67107840,"ra":0,"rb":1515152261580153489}}]"#)?;
+    process.exp_string(r#"[{"LogData":{"data":"0000000000000004","digest":"8005f02d43fa06e7d0585fb64c961d57e318b27a145c857bcd3a6bdb413ff7fc","id":"0000000000000000000000000000000000000000000000000000000000000000","is":10368,"len":8,"pc":12312,"ptr":67108856,"ra":0,"rb":1515152261580153489}}]"#)?;
     process.exp_string("      test test_log_2")?;
     process.exp_string("raw logs:")?;
-    process.exp_string(r#"[{"LogData":{"data":"0000000000000002","digest":"cd04a4754498e06db5a13c5f371f1f04ff6d2470f24aa9bd886540e5dce77f70","id":"0000000000000000000000000000000000000000000000000000000000000000","is":10368,"len":8,"pc":12044,"ptr":67107840,"ra":0,"rb":1515152261580153489}}]"#)?;
+    process.exp_string(r#"[{"LogData":{"data":"0000000000000002","digest":"cd04a4754498e06db5a13c5f371f1f04ff6d2470f24aa9bd886540e5dce77f70","id":"0000000000000000000000000000000000000000000000000000000000000000","is":10368,"len":8,"pc":12312,"ptr":67108856,"ra":0,"rb":1515152261580153489}}]"#)?;
 
     process.process.exit()?;
     Ok(())
@@ -77,12 +77,12 @@ fn test_forc_test_both_logs() -> Result<(), rexpect::error::Error> {
     process.exp_string("decoded log values:")?;
     process.exp_string("4, log rb: 1515152261580153489")?;
     process.exp_string("raw logs:")?;
-    process.exp_string(r#"[{"LogData":{"data":"0000000000000004","digest":"8005f02d43fa06e7d0585fb64c961d57e318b27a145c857bcd3a6bdb413ff7fc","id":"0000000000000000000000000000000000000000000000000000000000000000","is":10368,"len":8,"pc":12044,"ptr":67107840,"ra":0,"rb":1515152261580153489}}]"#)?;
+    process.exp_string(r#"[{"LogData":{"data":"0000000000000004","digest":"8005f02d43fa06e7d0585fb64c961d57e318b27a145c857bcd3a6bdb413ff7fc","id":"0000000000000000000000000000000000000000000000000000000000000000","is":10368,"len":8,"pc":12312,"ptr":67108856,"ra":0,"rb":1515152261580153489}}]"#)?;
     process.exp_string("      test test_log_2")?;
     process.exp_string("decoded log values:")?;
     process.exp_string("2, log rb: 1515152261580153489")?;
     process.exp_string("raw logs:")?;
-    process.exp_string(r#"[{"LogData":{"data":"0000000000000002","digest":"cd04a4754498e06db5a13c5f371f1f04ff6d2470f24aa9bd886540e5dce77f70","id":"0000000000000000000000000000000000000000000000000000000000000000","is":10368,"len":8,"pc":12044,"ptr":67107840,"ra":0,"rb":1515152261580153489}}]"#)?;
+    process.exp_string(r#"[{"LogData":{"data":"0000000000000002","digest":"cd04a4754498e06db5a13c5f371f1f04ff6d2470f24aa9bd886540e5dce77f70","id":"0000000000000000000000000000000000000000000000000000000000000000","is":10368,"len":8,"pc":12312,"ptr":67108856,"ra":0,"rb":1515152261580153489}}]"#)?;
     process.process.exit()?;
     Ok(())
 }

sway-ast/src/intrinsics.rs

@@ -46,6 +46,8 @@ pub enum Intrinsic {
     ElemAt, // let elem: &T = __elem_at::<T: array or ref_to_slice>(item: T, index)
     Transmute, // let dst: B = __transmute::<A, B>(src)
     Dbg,   // __dbg(value)
+    RuntimeMemoryId, // __runtime_mem_id::<T>() -> u64
+    EncodingMemoryId, // __encoding_mem_id::<T>() -> u64
 }
 
 impl fmt::Display for Intrinsic {
@@ -94,6 +96,8 @@ impl fmt::Display for Intrinsic {
             Intrinsic::ElemAt => "elem_at",
             Intrinsic::Transmute => "transmute",
             Intrinsic::Dbg => "dbg",
+            Intrinsic::RuntimeMemoryId => "runtime_mem_id",
+            Intrinsic::EncodingMemoryId => "encoding_mem_id",
         };
         write!(f, "{s}")
     }
@@ -146,6 +150,8 @@ impl Intrinsic {
             "__elem_at" => ElemAt,
             "__transmute" => Transmute,
             "__dbg" => Dbg,
+            "__runtime_mem_id" => RuntimeMemoryId,
+            "__encoding_mem_id" => EncodingMemoryId,
             _ => return None,
         })
     }

sway-core/src/ir_generation/const_eval.rs

@@ -1,10 +1,12 @@
 use std::{
+    hash::{DefaultHasher, Hash},
     io::Read,
     ops::{BitAnd, BitOr, BitXor, Not, Rem},
 };
 
 use crate::{
     engine_threading::*,
+    ir_generation::function::{get_encoding_representation, get_memory_id},
     language::{
         ty::{self, TyConstantDecl, TyIntrinsicFunctionKind},
         CallPath, Literal,
@@ -1693,6 +1695,50 @@ fn const_eval_intrinsic(
         Intrinsic::Dbg => {
             unreachable!("__dbg should not exist in the typed tree")
         }
+        Intrinsic::RuntimeMemoryId => {
+            assert!(intrinsic.type_arguments.len() == 1);
+            assert!(intrinsic.arguments.is_empty());
+
+            let t = &intrinsic.type_arguments[0];
+            let t = convert_resolved_type_id(
+                lookup.engines,
+                lookup.context,
+                lookup.md_mgr,
+                lookup.module,
+                lookup.function_compiler,
+                t.type_id(),
+                &t.span(),
+            )
+            .unwrap();
+
+            let id = get_memory_id(lookup.context, t);
+            let c = ConstantContent {
+                ty: Type::get_uint64(lookup.context),
+                value: ConstantValue::Uint(id),
+            };
+
+            Ok(Some(Constant::unique(lookup.context, c)))
+        }
+        Intrinsic::EncodingMemoryId => {
+            assert!(intrinsic.type_arguments.len() == 1);
+            assert!(intrinsic.arguments.is_empty());
+
+            let t = intrinsic.type_arguments[0].as_type_argument().unwrap();
+
+            let r = get_encoding_representation(lookup.engines, t.type_id);
+
+            use std::hash::Hasher;
+            let mut state = DefaultHasher::default();
+            r.hash(&mut state);
+            let id = state.finish();
+
+            let c = ConstantContent {
+                ty: Type::get_uint64(lookup.context),
+                value: ConstantValue::Uint(id),
+            };
+
+            Ok(Some(Constant::unique(lookup.context, c)))
+        }
     }
 }