EIP-7883 --- MODEXP pricing tests
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...zation/src/test/java/net/consensys/linea/zktracer/precompiles/modexp/ModexpEIP7883Tests.java
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| BytecodeRunner bytecodeRunner = BytecodeRunner.of(program.compile()); | ||
| bytecodeRunner.run(List.of(codeOwnerAccount), chainConfig, testInfo); | ||
| } |
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Bug: Parameter exponentLeadingWord unused in test body
The exponentLeadingWord parameter in modexpEIP7883TestBody is never used in the method body. The test pre-computes leading words for exponents but doesn't incorporate them into the test input. This parameter should be used to construct the exponent portion of the MODEXP input data.
| cdsValues.add(bbs + extra); | ||
| } | ||
| return cdsValues; | ||
| } |
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Bug: Missing 96-byte header offset in call data size calculation
The cdsValues method computes call data sizes without accounting for the 96-byte MODEXP header. The MODEXP precompile input format places bbs, ebs, mbs (each 32 bytes) before the actual base, exponent, and modulus data, so valid call data sizes are 96 + bbs + .... The current calculation produces values like bbs + ebs instead of 96 + bbs + ebs, causing tests to pass much smaller call data sizes than intended and not properly testing the EIP-7883 pricing scenarios. The BASE_MIN_OFFSET constant (0x60 = 96) should be added to each computed cds value.
| final String leadingWordAsHex = | ||
| leadingWord.signum() != 0 ? leadingWord.toString(16) : ""; | ||
| final String leftPaddedLeadingWordAsHex = | ||
| "0".repeat(Math.max(0, 2 * minEbs32 - leadingWordAsHex.length())) |
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Just add a sanity check that leftPaddedLeadingWordAsHex has length (as a string) of 2 * minEbs32.
| for (Integer extra : ebs != 0 ? List.of(ebs / 2, ebs, ebs + mbs) : List.of(0, mbs)) { | ||
| cdsValues.add(bbs + extra); | ||
| } | ||
| return cdsValues; |
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We need the 96 likely ...
| + "00".repeat(bbs) | ||
| + exponentLeadingWord | ||
| + "00".repeat(Math.max(0, ebs - Math.min(ebs, 32))) | ||
| + "00".repeat(mbs)); |
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It may be simpler to stop at
Bytes.fromHexString(
bbsHex
+ ebsHex
+ mbsHex
+ "00".repeat(bbs)
+ exponentLeadingWord;and then either right 0 pad, or don't even bother and just give the right cds.
| .op(OpCode.EXTCODESIZE) // size | ||
| .push(0) // offset | ||
| .push(0) // targetOffset | ||
| .push(codeOwnerAddress) // address |
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codeOwnerAddress could be renamed as callDataAsByteCodeAddress
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codeOwnerAddress makes sense whenever we use that bytecode say as initialization code for a CREATE(2). Here we are using that account's "byte code" as call data for the MODEXP call.
| .push(mbs) // retSize | ||
| .push(input.size()) // retOffset | ||
| .push(cds) // argSize | ||
| .push(0) // argOffset |
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cds and input.size() ought to be the same.
OlivierBBB
deleted the
2496-eip-7823-and-eip-7883-----modexp-pricing-tests
branch
Note
Add parameterized EIP‑7883 MODEXP tests (with nightly full matrix) and move existing Modexp tests into the modexp package.
ModexpEIP7883Testswith parameterized/nightly matrices generating calldata permutations (bbs,ebs,mbs,cds, exponent leading words), invokingSTATICCALLtoAddress.MODEXPand asserting return size on success.ModexpTestsintonet.consensys.linea.zktracer.precompiles.modexppackage.Written by Cursor Bugbot for commit b6103d0. This will update automatically on new commits. Configure here.