feat: EIP-7954 — double max code size and initcode limit (Amsterdam) (#12)

* feat: EIP-7954 — double max code size and initcode limit for Amsterdam

Signed-off-by: garyschulte <garyschulte@gmail.com>

Author: Gabriel-Trintinalia

src/handler/validation.zig

@@ -16,8 +16,6 @@ const TX_EIP7702_AUTH_COST: u64 = 25000;
 // EIP-7623: token costs (different from calldata gas costs)
 const FLOOR_ZERO_TOKEN_COST: u64 = 1;
 const FLOOR_NONZERO_TOKEN_COST: u64 = 4;
-// EIP-3860: max initcode size = 2 * MAX_CODE_SIZE
-const MAX_INITCODE_SIZE: usize = 49152;
 
 /// Validation utilities
 pub const Validation = struct {
@@ -95,10 +93,12 @@ pub const Validation = struct {
         const spec = ctx.cfg.spec;
 
         // EIP-3860 (Shanghai+): initcode size limit for CREATE transactions
+        // EIP-7954 (Amsterdam+): limit doubled to 65536
         if (primitives.isEnabledIn(spec, .shanghai)) {
             if (tx.kind == .Create) {
                 const calldata_len = if (tx.data) |d| d.items.len else 0;
-                if (calldata_len > MAX_INITCODE_SIZE) {
+                const max_initcode: usize = if (primitives.isEnabledIn(spec, .amsterdam)) primitives.AMSTERDAM_MAX_INITCODE_SIZE else primitives.MAX_INITCODE_SIZE;
+                if (calldata_len > max_initcode) {
                     return ValidationError.CreateInitcodeOverLimit;
                 }
             }

src/interpreter/host.zig

@@ -416,16 +416,17 @@ pub const Host = struct {
         frame_depth: usize,
     ) CreateSetupResult {
         const MAX_CALL_DEPTH = 1024;
-        const MAX_CODE_SIZE: usize = 24576;
-        const MAX_INITCODE_SIZE: usize = 2 * MAX_CODE_SIZE;
-
         const js = &self.ctx.journaled_state;
         const spec_id = js.inner.spec;
 
         if (frame_depth >= MAX_CALL_DEPTH) return .{ .failed = CreateResult.preExecFailure(gas_limit) };
 
         if (primitives.isEnabledIn(spec_id, .shanghai)) {
-            if (init_code.len > MAX_INITCODE_SIZE) return .{ .failed = CreateResult.preExecFailure(gas_limit) };
+            const max_initcode: usize = if (primitives.isEnabledIn(spec_id, .amsterdam))
+                primitives.AMSTERDAM_MAX_INITCODE_SIZE
+            else
+                primitives.MAX_INITCODE_SIZE;
+            if (init_code.len > max_initcode) return .{ .failed = CreateResult.preExecFailure(gas_limit) };
         }
 
         if (value > 0) {
@@ -491,7 +492,7 @@ pub const Host = struct {
         return_data: []const u8,
         spec_id: primitives.SpecId,
     ) CreateResult {
-        const MAX_CODE_SIZE: usize = 24576;
+        const MAX_CODE_SIZE: usize = if (primitives.isEnabledIn(spec_id, .amsterdam)) primitives.AMSTERDAM_MAX_CODE_SIZE else primitives.MAX_CODE_SIZE;
         const js = &self.ctx.journaled_state;
 
         if (!result.isSuccess()) {

src/interpreter/opcodes/call.zig

@@ -382,8 +382,10 @@ pub fn opCreate(ctx: *InstructionContext) void {
     }
 
     // EIP-3860 (Shanghai+): oversized initcode causes exceptional halt in calling frame.
+    // EIP-7954 (Amsterdam+): limit doubled to 65536 (2 * 32768).
     if (primitives.isEnabledIn(spec, .shanghai)) {
-        if (size_u > 49152) { // MAX_INITCODE_SIZE = 2 * 24576
+        const max_initcode: usize = if (primitives.isEnabledIn(spec, .amsterdam)) primitives.AMSTERDAM_MAX_INITCODE_SIZE else primitives.MAX_INITCODE_SIZE;
+        if (size_u > max_initcode) {
             ctx.interpreter.halt(.out_of_gas);
             return;
         }
@@ -491,8 +493,10 @@ pub fn opCreate2(ctx: *InstructionContext) void {
     }
 
     // EIP-3860 (Shanghai+): oversized initcode causes exceptional halt in calling frame.
+    // EIP-7954 (Amsterdam+): limit doubled to 65536 (2 * 32768).
     if (primitives.isEnabledIn(spec, .shanghai)) {
-        if (size_u > 49152) { // MAX_INITCODE_SIZE = 2 * 24576
+        const max_initcode: usize = if (primitives.isEnabledIn(spec, .amsterdam)) primitives.AMSTERDAM_MAX_INITCODE_SIZE else primitives.MAX_INITCODE_SIZE;
+        if (size_u > max_initcode) {
             ctx.interpreter.halt(.out_of_gas);
             return;
         }

src/primitives/main.zig

@@ -81,6 +81,15 @@ pub const STACK_LIMIT: usize = 1024;
 /// EVM call stack limit
 pub const CALL_STACK_LIMIT: u64 = 1024;
 
+/// EIP-170: maximum deployed contract code size (24576 bytes)
+pub const MAX_CODE_SIZE: usize = 24576;
+/// EIP-7954 (Amsterdam+): maximum deployed contract code size doubled (32768 bytes)
+pub const AMSTERDAM_MAX_CODE_SIZE: usize = 32768;
+/// EIP-3860: maximum initcode size = 2 * MAX_CODE_SIZE (49152 bytes)
+pub const MAX_INITCODE_SIZE: usize = 2 * MAX_CODE_SIZE;
+/// EIP-7954 (Amsterdam+): maximum initcode size = 2 * AMSTERDAM_MAX_CODE_SIZE (65536 bytes)
+pub const AMSTERDAM_MAX_INITCODE_SIZE: usize = 2 * AMSTERDAM_MAX_CODE_SIZE;
+
 /// Blob base fee update fraction for Cancun hardfork (EIP-4844)
 pub const BLOB_BASE_FEE_UPDATE_FRACTION_CANCUN: u64 = 3338477;
 /// Blob base fee update fraction for Prague/Osaka hardfork (EIP-7691)