79 lines
2.7 KiB
Nim
79 lines
2.7 KiB
Nim
# Nimbus
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# Copyright (c) 2020-2023 Status Research & Development GmbH
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# Licensed under either of
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# * Apache License, version 2.0, ([LICENSE-APACHE](LICENSE-APACHE) or
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# http://www.apache.org/licenses/LICENSE-2.0)
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# * MIT license ([LICENSE-MIT](LICENSE-MIT) or
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# http://opensource.org/licenses/MIT)
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# at your option. This file may not be copied, modified, or distributed except
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# according to those terms.
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const postStateTracer* = """{
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postState: {},
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// lookupAccount injects the specified account into the postState object.
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lookupAccount: function(addr, db){
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var acc = toHex(addr);
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if (this.postState[acc] === undefined) {
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this.postState[acc] = {
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code: toHex(db.getCode(addr)),
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storage: {}
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};
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}
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},
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// lookupStorage injects the specified storage entry of the given account into
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// the postState object.
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lookupStorage: function(addr, key, db){
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var acc = toHex(addr);
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var idx = toHex(key);
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this.lookupAccount(addr, db);
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if (this.postState[acc].storage[idx] === undefined) {
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// bug in geth js tracer
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// we will use eth_getProof to fill the storage later
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this.postState[acc].storage[idx] = "";
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}
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},
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// result is invoked when all the opcodes have been iterated over and returns
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// the final result of the tracing.
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result: function(ctx, db) {
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this.lookupAccount(ctx.from, db);
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this.lookupAccount(ctx.to, db);
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// Return the assembled allocations (postState)
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return this.postState;
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},
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// step is invoked for every opcode that the VM executes.
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step: function(log, db) {
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// Add the current account if we just started tracing
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if (this.postState === null){
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this.postState = {};
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// Balance will potentially be wrong here, since this will include the value
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// sent along with the message. We fix that in 'result()'.
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this.lookupAccount(log.contract.getAddress(), db);
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}
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// Whenever new state is accessed, add it to the postState
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switch (log.op.toString()) {
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case "EXTCODECOPY": case "EXTCODESIZE": case "BALANCE":
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this.lookupAccount(toAddress(log.stack.peek(0).toString(16)), db);
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break;
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case "CREATE":
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var from = log.contract.getAddress();
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this.lookupAccount(toContract(from, db.getNonce(from)), db);
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break;
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case "CALL": case "CALLCODE": case "DELEGATECALL": case "STATICCALL":
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this.lookupAccount(toAddress(log.stack.peek(1).toString(16)), db);
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break;
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case 'SSTORE':case 'SLOAD':
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this.lookupStorage(log.contract.getAddress(), toWord(log.stack.peek(0).toString(16)), db);
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break;
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}
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},
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// fault is invoked when the actual execution of an opcode fails.
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fault: function(log, db) {}
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}
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"""
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