Support for EXTCODEHASH

include/evmc/evmc.h

@@ -40,7 +40,7 @@ extern "C" {
 enum
 {
     /** The EVMC ABI version number of the interface declared in this file. */
-    EVMC_ABI_VERSION = 3
+    EVMC_ABI_VERSION = 4
 };
 
 /**
@@ -491,6 +491,18 @@ typedef void (*evmc_get_balance_fn)(struct evmc_uint256be* result,
 typedef size_t (*evmc_get_code_size_fn)(struct evmc_context* context,
                                         const struct evmc_address* address);
 
+/**
+ * Get code size callback function.
+ *
+ *  This callback function is used by an EVM to get the keccak256 hash of the code stored
+ *  in the account at the given address. For accounts not having a code, this
+ *  function returns keccak256 hash of empty data. For accounts not existing in the state,
+ *  this function returns 0.
+ */
+typedef void (*evmc_get_code_hash_fn)(struct evmc_uint256be* result,
+                                      struct evmc_context* context,
+                                      const struct evmc_address* address);
+
 /**
  * Copy code callback function.
  *
@@ -591,6 +603,9 @@ struct evmc_context_fn_table
     /** Get code size callback function. */
     evmc_get_code_size_fn get_code_size;
 
+    /** Get code hash callback function. */
+    evmc_get_code_hash_fn get_code_hash;
+
     /** Copy code callback function. */
     evmc_copy_code_fn copy_code;
 

lib/instructions/instruction_metrics.c

@@ -85,7 +85,7 @@ static struct evmc_instruction_metrics constantinople_metrics[256] = {
     /*    EXTCODECOPY = 0x3c */ {700, 4, 0},
     /* RETURNDATASIZE = 0x3d */ {BASE, 0, 1},
     /* RETURNDATACOPY = 0x3e */ {VERYLOW, 3, 0},
-    /*                = 0x3f */ {UNDEFINED, 0, 0},
+    /*    EXTCODEHASH = 0x3f */ {400, 1, 1},
     /*      BLOCKHASH = 0x40 */ {20, 1, 1},
     /*       COINBASE = 0x41 */ {BASE, 0, 1},
     /*      TIMESTAMP = 0x42 */ {BASE, 0, 1},