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feat(Codegen): factor solidityPanicPayload for Panic(uint256) emission (#1999) #2030

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Merged
Th0rgal merged 1 commit into from
Jun 18, 2026
+11 −2
Merged

feat(Codegen): factor solidityPanicPayload for Panic(uint256) emission (#1999) #2030

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11 changes: 9 additions & 2 deletions Compiler/CompilationModel/DynamicData.lean
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Original file line number Diff line number Diff line change
Expand Up @@ -117,8 +117,12 @@ def panicError0x11HelperName : String :=
def panicError0x12HelperName : String :=
"panic_error_0x12"

def panicErrorHelper (helperName : String) (code : Nat) : YulStmt :=
YulStmt.funcDef helperName [] [] [
/-- ABI payload for Solidity's built-in `Panic(uint256)` error.

The payload is exactly 36 bytes:
4-byte selector `0x4e487b71` followed by one ABI word containing `code`. -/
def solidityPanicPayload (code : Nat) : List YulStmt :=
[
YulStmt.expr (YulExpr.call "mstore" [
YulExpr.lit 0,
YulExpr.call "shl" [YulExpr.lit 224, YulExpr.hex 0x4e487b71]
Expand All @@ -127,6 +131,9 @@ def panicErrorHelper (helperName : String) (code : Nat) : YulStmt :=
YulStmt.expr (YulExpr.call "revert" [YulExpr.lit 0, YulExpr.lit 36])
]

def panicErrorHelper (helperName : String) (code : Nat) : YulStmt :=
YulStmt.funcDef helperName [] [] (solidityPanicPayload code)

def panicError0x11Helper : YulStmt :=
panicErrorHelper panicError0x11HelperName 0x11

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2 changes: 2 additions & 0 deletions Compiler/CompilationModelFeatureTest.lean
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Expand Up @@ -5731,6 +5731,8 @@ set_option maxRecDepth 4096 in
(contains arithmeticPanicYul s!"function {panicError0x11HelperName}()" &&
contains arithmeticPanicYul s!"function {panicError0x12HelperName}()" &&
contains arithmeticPanicYul "shl(224, 0x4e487b71)" &&
contains arithmeticPanicYul "mstore(4, 17)" &&
contains arithmeticPanicYul "mstore(4, 18)" &&
contains arithmeticPanicYul "revert(0, 36)")
let envYul ← expectCompileToYul "env runtime smoke spec" envRuntimeSmokeSpec
expectTrue "address(this) lowers to the Yul address builtin"
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