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Danno Ferrin ae3bd0129e More trace fixes (#386 )

* pop flat trace context when handling halts
* Better detection of precompiled and non-executed contracts
* correct from address when calling in init code
* fix some exotic nesting cases
* correct from field for init code calls at depth >1
* correct cost on a non-call
* changelog and notes

Signed-off-by: Danno Ferrin <danno.ferrin@gmail.com>

2020-02-12 10:31:52 -07:00

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Trace RPC API Notes

This document outlines major differences for trace_replayBlockTransactions compared to other implementations.

`stateDiff`

No major differences were observed in the stateDiff field.

`trace`

Besu reports gasUsed after applying the effects of gas refunds. Future implementations of Besu might track gas refunds separately.

`vmTrace`

Returned Memory from Calls

In the vmTrace ope.ex.mem fields Besu only reports actual data returned from a RETURN opcode. Other implementations return the contents of the reserved output space for the call operations. Note two major differences:

Besu reports null when a call operation ends because of a STOP, HALT, REVERT, running out of instructions, or any exceptional halts.
When a RETURN operation returns data of a different length than the space reserved by the call only the data passed to the RETURN operation is reported. Other implementations will include pre-existing memory data or trim the returned data.

Precompiled Contracts Calls

Besu reports only the actual cost of the precompiled contract call in the cost field.

Out of Gas

Besu reports the operation that causes out fo gas exceptions, including calculated gas cost. The operation is not executed so no ex values are reported.

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