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LLL: Fix for edge case in the create macros.

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When (msize) is initially zero the previous create commands failed due to the "lll"
expression overwriting the memory at 0x00. This fix "reserves" memory location 0x00
before calling msize. If msize is already 32 or greater it has no effect.
This commit is contained in:
benjaminion 2017-06-22 09:44:34 +01:00
parent 3094e77748
commit ff8de3e9fa
1 changed files with 3 additions and 2 deletions
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5
liblll/CompilerState.cpp
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@ -54,8 +54,9 @@ void CompilerState::populateStandard()
"(def 'msg (gaslimit to value data) { [0]:data (msg gaslimit to value 0 32) })"
"(def 'msg (to value data) { [0]:data (msg allgas to value 0 32) })"
"(def 'msg (to data) { [0]:data (msg allgas to 0 0 32) })"
"(def 'create (value code) { [0]:(msize) (create value @0 (lll code @0)) })"
"(def 'create (code) { [0]:(msize) (create 0 @0 (lll code @0)) })"
// NOTE: in the create macros, memory location 0 is set in order to force msize to be at least 32 bytes.
"(def 'create (value code) { [0]:0 [0]:(msize) (create value @0 (lll code @0)) })"
"(def 'create (code) { [0]:0 [0]:(msize) (create 0 @0 (lll code @0)) })"
"(def 'sha3 (loc len) (keccak256 loc len))"
"(def 'sha3 (val) { [0]:val (sha3 0 32) })"
"(def 'sha3pair (a b) { [0]:a [32]:b (sha3 0 64) })"