Commit graph

228 commits

Author SHA1 Message Date
Evgenii Stratonikov
f7f48d0048 vm: implement ISNULL opcode 2020-04-02 14:15:17 +03:00
Evgenii Stratonikov
3db030bbb6 vm: implement PUSHNULL opcode 2020-04-02 14:15:17 +03:00
Roman Khimov
2d0ad30fcf vm: rework Map with internal slice representation
Which makes iterating over map stable which is important for serialization and
and even fixes occasional test failures. We use the same ordering here as
NEO 3.0 uses, but it should also be fine for NEO 2.0 because it has no
defined order.
2020-04-01 19:33:53 +03:00
Evgenii Stratonikov
4522eed1bb vm: fix offset for CALLI opcode
It is different from other JMP* and +2 should be added to the parameter.
2020-03-26 13:09:55 +03:00
Evgenii Stratonikov
4b44190485 vm: use truncated division for Integers
When divisor is negative, the result is truncated towards
zero.
2020-03-17 15:45:56 +03:00
Roman Khimov
1b5dd53e07
Merge pull request #746 from nspcc-dev/fix/equal
vm: implement EQUAL opcode properly

Fixes #745, #749.
2020-03-12 11:46:51 +03:00
Evgenii Stratonikov
dfc59129c7 vm: implement EQUAL opcode properly
When comparing elements of different types, conversions
should be performed. This commit implement custom equality
predicate for each stack item type.
2020-03-11 17:19:10 +03:00
Roman Khimov
8318adac56 vm: add support for dynamic invocations in APPCALL
Fixes #740.
2020-03-10 17:17:36 +03:00
Roman Khimov
e41d434a49 *: move all packages from CityOfZion to nspcc-dev 2020-03-03 17:21:42 +03:00
Roman Khimov
56e37ad6ba vm: drop duplicating stackItem structure, build JSON from Parameters
smartcontract.Parameter has everything needed now.
2020-03-03 15:38:03 +03:00
Evgenii Stratonikov
2a86149c82 vm: leave single CHECKMULTISIG implementation
Remove sequential implementation and benchmarks.
They will be still present in commit history.
2020-02-05 17:17:22 +03:00
Roman Khimov
02a5e036fc vm: deduplicate checkMultisigPar
Make its logic more clear.
2020-02-05 17:12:23 +03:00
Evgenii Stratonikov
d93d060010 vm: parallelize CHECKMULTISIG 2020-02-05 17:12:18 +03:00
Evgenii Stratonikov
7a6d6f43ce vm: get rid of recursive (*VM).execute calls
Recursive execute() calls can affect gas calculation.
This commit makes execute() be called only for real opcodes
and moves duplicate logic for CALL/JMP into a separate function.
2020-01-22 14:31:57 +03:00
Evgenii Stratonikov
d72d978a19 vm: abstract out GetInterop() function 2020-01-22 14:04:40 +03:00
Evgenii Stratonikov
c22d09adad vm: set GAS limit
Make it possible to set maximum amount of GAS which can be spent
during execution.
2020-01-22 14:04:40 +03:00
Evgenii Stratonikov
0662a7e3c2 vm: calculate GAS spent during execution
If getPrice callback is provided, accumulate spent GAS.
2020-01-22 14:04:40 +03:00
Roman Khimov
cc16dac0b4 vm: optimize script loading a bit
Preseed the scriptHash value when we already know it. Eliminates this time
waste from the pprof graph, but doesn't really change anything in the 1.4M ->
1.5M 100K mainnet blocks import test.
2019-12-23 18:02:39 +03:00
Roman Khimov
a7457d08a1 vm/core: add ID support for SYSCALL, redo interop registration
This solves two problems:
 * adds support for shortened SYSCALL form that uses IDs (similar to #434, but
   for NEO 2.0, supporting both forms), which is important for compatibility
   with C# node and mainnet chain that uses it from some height
 * reworks interop plugging to use callbacks rather than appending to the map,
   these map mangling functions are clearly visible in the VM profiling
   statistics and we want spawning a VM to be fast, so it makes sense
   optimizing it. This change moves most of the work to the init() phase
   making VM setup cheaper.

Caveats:
 * InteropNameToID accepts `[]byte` because that's the thing we have in
   SYSCALL processing and that's the most often usecase for it, it leads to
   some conversions in other places but that's acceptable because those are
   either tests or init()
 * three getInterop functions are: `getDefaultVMInterop`, `getSystemInterop`
   and `getNeoInterop`

Our 100K (1.4M->1.5M) block import time improves by ~4% with this change.
2019-12-19 13:35:42 +03:00
Roman Khimov
21efcb012b vm: fix non-dupped items in PICKITEM
TestPICKITEMDupMap and TestPICKITEMDupArray were failing.
2019-12-17 20:26:30 +03:00
Roman Khimov
a6d60e387a vm: fix OVER and PICK to duplicate stack items
TestPICKDup and TestOVERDup failed without this.
2019-12-17 20:26:30 +03:00
Roman Khimov
c596a6b273 vm: fix INVERT behaviour for converted values
Tests added were failing before this change.
2019-12-17 20:26:30 +03:00
Roman Khimov
587cfc7c66 vm: optimize ROLL/ROT, refactor common code
Add `Roll` method to Stack that doesn't pop and push values and use it for
ROLL and ROT.

1.4M->1.5M 100K block import test before:
real    3m44,292s
user    5m43,494s
sys     0m34,741s

After:
real    3m40,449s
user    5m42,701s
sys     0m35,500s
2019-12-16 19:53:21 +03:00
Roman Khimov
2627628387 vm: optimize SWAP instruction, refactor common code
Add `Swap` method to the Stack and use it for both SWAP and XSWAP. Avoid
element popping and pushing (and associated accounting costs).

1.4M->1.5M 100K block import test before:
real    3m51,885s
user    5m54,744s
sys     0m38,444s

After:
real    3m44,292s
user    5m43,494s
sys     0m34,741s
2019-12-16 19:02:40 +03:00
Roman Khimov
0afaff2f79 vm: microoptimize RegisterInteropFuncs()
Avoid useless copying.
2019-12-13 17:02:28 +03:00
Roman Khimov
d0f9a28196 vm/core: improve block import speed with PublicKey caching
This change (closely related to the neo-project/neo#1321 proposal) speeds up
1.4M mainnet blocks import by 30%. Basically, we're eliminating key decoding
for block's multisignature that has the same keys most of the time.

Things I don't like about this patch:
 * yet another parameter for verifyHashAgainstScript()
 * vm keys are not copied in/out

But it's rather simple and solves the problem for this particular case, so I
think it's worth it.
2019-12-10 19:13:29 +03:00
Evgenii Stratonikov
7179e4ba9f util: add LE suffix to Uint256 methods 2019-12-06 12:16:55 +03:00
Evgenii Stratonikov
57efad912c util: add LE suffix to Uint160 methods 2019-12-06 12:16:55 +03:00
Roman Khimov
8d4dd2d2e1 vm: move opcodes into their own package
This allows easier reuse of opcodes and in some cases allows to eliminate
dependencies on the whole vm package, like in compiler that only needs opcodes
and doesn't care about VM for any other purpose.

And yes, they're opcodes because an instruction is a whole thing with
operands, that's what context.Next() returns.
2019-12-03 18:22:14 +03:00
Evgenii Stratonikov
816d78b5ee vm: redefine SHL/SHR limits based on integer size 2019-11-07 12:50:11 +03:00
Evgenii Stratonikov
439cd72294 vm: restrict BigInteger item size 2019-11-07 12:34:27 +03:00
Evgenii Stratonikov
7d40d2f71e vm: make StepOut/StepOver match original VM behavior 2019-11-06 12:25:04 +03:00
Evgenii Stratonikov
9ebb793009 vm: revert SUBSTR offset behavior to NEO 2.x 2019-11-06 12:15:55 +03:00
067d9655bf vm: restrict total stack item count 2019-11-06 11:03:43 +03:00
ed758458d5 vm: implement serialization interops in core package 2019-11-05 17:10:52 +03:00
25f77257ce vm: implement Boolean and ByteArray item serialization 2019-11-05 15:15:39 +03:00
Roman Khimov
2f6e678a19
Merge pull request #463 from nspcc-dev/smartcontract-fixes
Smartcontract RPC fixes
2019-10-29 20:54:46 +03:00
Roman Khimov
47f66dfbf3 vm: add State() method to get a state description 2019-10-29 18:26:04 +03:00
c7f0b7bd68 vm: restrict max invocation stack size 2019-10-29 15:09:17 +03:00
Roman Khimov
ae7687422c vm: clear state in Load()
Make VM usable after the first run.
2019-10-29 12:53:09 +03:00
Roman Khimov
f0cffe0d3f vm: implement stack isolation opcodes, fix #192
No tests yet.
2019-10-25 18:25:12 +03:00
Roman Khimov
a9a2a3c711 vm: fix tests failing, follow-up to #426
Deal with input and transitional VM states properly.
2019-10-22 15:20:44 +03:00
Roman Khimov
3cbb699eb7
Merge pull request #426 from nspcc-dev/logger_247
Change fmt.Println to log, close #247.
2019-10-22 14:41:30 +03:00
Vsevolod Brekelov
e2bfff8666 vm: removed mute mode and pushed logging to upper lvl
VM should be responsible for code execution and in case anyone interested in additional logging or errors they could handle them like we do it iin cli.
2019-10-22 13:44:14 +03:00
Evgenii Stratonikov
b2609786e9 vm: copy slice in NEWARRAY/NEWSTRUCT
When performing NEWARRAY on a Struct or NEWSTRUCT on a Array,
underlying slice needs to be copied, because when it's capacity
doesn't matches it's length, underlying storage will be used
for appends even if it is already pointed at by another slice.
2019-10-22 13:34:35 +03:00
Vsevolod Brekelov
f2805541cb vm: fix style and comments 2019-10-21 14:22:17 +03:00
Evgenii Stratonikov
cae431b844 vm: restrict max item size in CAT 2019-10-17 17:09:42 +03:00
Evgenii Stratonikov
6d7016c3b9 vm: restrict max size in SETITEM 2019-10-17 12:17:06 +03:00
Evgenii Stratonikov
6f1f9e56bb vm: restrict max size in PACK 2019-10-17 12:17:06 +03:00
Evgenii Stratonikov
2d56c66bde vm: restrict max size in APPEND 2019-10-17 12:17:01 +03:00
Evgenii Stratonikov
8abcaeee6f vm: restrict max size in NEWARRAY/NEWSTRUCT 2019-10-17 11:48:48 +03:00
Vsevolod Brekelov
591d5eafbe vm: add stepInto,stepOver,stepOut
Original C# vm debugger behavior
2019-10-14 18:37:11 +03:00
Roman Khimov
dca332f333 vm: use new Context.Next() to properly dump programs
Fix #295, deduplicate code and add `inspect` parameter to the vm command to
dump AVMs (`contract inspect` works with Go code).
2019-10-04 16:13:39 +03:00
Roman Khimov
53a3b18652 vm: completely separate instruction read and execution phases
Make Context.Next() return both opcode and instruction parameter if any. This
simplifies some code and needed to deal with #295.
2019-10-04 16:13:39 +03:00
Roman Khimov
d62a367900 vm: add Value() method to Element
It gives access to the internal value's Value() which is essential for interop
functions that need to get something from InteropItems. And it also simplifies
some already existing code along the way.
2019-10-04 16:13:39 +03:00
Roman Khimov
0c963875af vm: check for fault flag first in Run()
Switch cases are evaluated sequentially and the fault case is top-priority to
handle.
2019-10-04 16:13:39 +03:00
Roman Khimov
705c7f106f vm: don't panic if there is no result in PopResult()
This function is intended to be ran outside of the execute's panic recovery
mechanism, so it shouldn't panic if there is no result.
2019-10-04 16:13:39 +03:00
Roman Khimov
a357d99624 vm: introduce MaxArraySize constant
This is both for #373 and for interop functions that have to check some
inputs.
2019-10-04 16:13:39 +03:00
Roman Khimov
da2156f955 vm: add batched RegisterInteropFuncs 2019-10-04 16:13:39 +03:00
Roman Khimov
26e3b6abbe vm: extend interops to contain price
The same way C# node does.
2019-10-04 16:13:39 +03:00
Roman Khimov
ceca9cdb67 core/vm: implement contract storage and script retrieval
Fixes script invocations via the APPCALL instruction. Adjust contract state
field types accordingly.
2019-10-04 16:13:39 +03:00
Roman Khimov
c3591d8897 vm: fix CHECKMULTISIG to comply with NEO VM implementation
Testing with testnet quickly revealed that our code has an issue when the key
count doesn't equal signature count, fix it and add some comments.
2019-10-01 13:41:26 +03:00
Evgenii Stratonikov
c7c4291774 vm: simplify APPEND implementation a bit 2019-09-25 17:53:36 +03:00
Evgenii Stratonikov
13d7770c68 vm: support Map in ARRAYSIZE
Also make logic the same as in reference implementation
and add tests.
2019-09-25 17:53:36 +03:00
Evgenii Stratonikov
c66f493017 vm: compare Map by reference in EQUAL 2019-09-25 17:53:36 +03:00
Evgenii Stratonikov
c0be2b2a99 vm: support Map in REMOVE 2019-09-25 17:53:36 +03:00
Evgenii Stratonikov
8b6bddca3c vm: support Map in PICKITEM and SETITEM 2019-09-25 17:53:36 +03:00
Evgenii Stratonikov
d7bb50c609 vm: implement VALUES opcode 2019-09-25 17:53:36 +03:00
Evgenii Stratonikov
2da64267b0 vm: implement KEYS opcode 2019-09-25 17:53:34 +03:00
Evgenii Stratonikov
0fb4bb05cf vm: implement HASKEY opcode 2019-09-25 12:08:41 +03:00
Evgenii Stratonikov
df18da0ac9 vm: implement NEWMAP opcode 2019-09-24 17:06:17 +03:00
Roman Khimov
ca9c9be71f vm: add CHECKSIG/VERIFY/CHECKMULTISIG implementations
Fix #269.
2019-09-24 13:01:54 +03:00
Roman Khimov
3bbeb2476e vm: introduce HasFailed() method and use it where appropriate
It's gonna be used by external modules.
2019-09-23 20:19:07 +03:00
Evgenii Stratonikov
3c53beca82 vm: restrict SHL/SHR arguments to -256..256
Also unify SHL/SHR implementation.
2019-09-23 15:13:10 +03:00
Evgenii Stratonikov
4a8be486f0 vm: do not pop items in OVER 2019-09-23 14:54:59 +03:00
Evgenii Stratonikov
7cd69ea8e2 vm: truncate length in SUBSTR
Also fail on first error, without changing the stack.
2019-09-23 14:54:59 +03:00
Evgenii Stratonikov
a88a8e13fc vm: compare Array by reference in EQUAL 2019-09-23 13:25:59 +03:00
Evgenii Stratonikov
99f1d761ca vm: clone Struct on APPEND 2019-09-23 13:25:59 +03:00
Evgenii Stratonikov
d2ccc3b017 vm: make REVERSE consume an item from stack 2019-09-16 15:50:51 +03:00
Evgenii Stratonikov
f0426ac2d5 vm: do nothing if SHL/SHR by 0 2019-09-16 15:50:51 +03:00
Evgenii Stratonikov
9eca5ee317 vm: convert SIZE argument to bytearray 2019-09-16 15:50:51 +03:00
Evgenii Stratonikov
9780889239 vm: make NEWARRAY/NEWSTRUCT accept bytearray 2019-09-16 15:50:51 +03:00
Evgenii Stratonikov
09e197eaf3 vm: make PUSH0 create empty bytearray
Also make tests expect []byte{} instead of 0.
2019-09-16 15:50:51 +03:00
Evgenii Stratonikov
66501f9ef9 vm: make REMOVE consume array from stack 2019-09-16 15:50:14 +03:00
Evgenii Stratonikov
71cfd14b92 vm: create an array of false items in NEWARRAY/NEWSTRUCT 2019-09-16 15:24:58 +03:00
Evgenii Stratonikov
bafdb916a0 vm: make PICKITEM accept bytearrays 2019-09-16 15:24:58 +03:00
Evgenii Stratonikov
1881adabb9 vm: fail if NIP has not enough arguments 2019-09-16 15:24:58 +03:00
Evgenii Stratonikov
6e4014547d vm: fail if DROP has no argument 2019-09-16 15:24:58 +03:00
Evgenii Stratonikov
729b7a0b24 vm: fail if ROT has not enough arguments 2019-09-16 15:24:58 +03:00
Evgenii Stratonikov
cf7fbb80ba vm: fail if EQUAL has not enough arguments 2019-09-16 15:24:58 +03:00
Evgenii Stratonikov
d257044298 vm: fail if XTUCK argument is 0 2019-09-16 15:24:58 +03:00
Evgenii Stratonikov
68c6c93980 vm: do not allow APPEND to operate on bytearray 2019-09-11 17:17:37 +03:00
Evgenii Stratonikov
723dcc6e25 vm: make APPEND push no value on stack 2019-09-11 17:17:34 +03:00
Roman Khimov
8311bda355 vm: harden LEFT and RIGHT implementations against negative indexes 2019-09-11 14:51:04 +03:00
Roman Khimov
17f3a21e27 vm: harden SUBSTR implementation against bad index/offset values
The upper index bound for slices is capacity, not length. Check for negative
values also. Fixes #387.
2019-09-11 14:37:41 +03:00
Roman Khimov
fc1075bf75 vm: protect PUSHDATA from short reads
Same thing done in a2a8981979 for PUSHBYTES,
failing to read the amount of bytes specified should lead to FAULT. Also
makes readUint16() and readUint32() panic as this is the behavior we want in
these cases. Add some tests along the way.
2019-09-11 12:35:37 +03:00
Evgenii
0b58ed4a22 vm: do not fault on LEFT with big index
Fixes #378.
2019-09-09 17:29:31 +03:00
Roman Khimov
a039ae6cdb
Merge pull request #374 from nspcc-dev/makefile-and-gofmt
Makefile convenience targets and gofmt
2019-09-09 15:05:12 +03:00
Roman Khimov
a2a8981979 vm: fix not failing PUSHBYTES* on short read
Add some tests also. Fixes #361.
2019-09-09 12:09:05 +03:00
Roman Khimov
fabd11699a *: gofmt -s
Appy gofmt for all the source tree.
2019-09-09 12:02:24 +03:00
Roman Khimov
450063de7d
Merge pull request #362 from nspcc-dev/add-missing-opcodes-into-the-list
Add missing opcodes into the list
2019-09-09 11:24:39 +03:00
Roman Khimov
7b0c2781d2 vm: expand instruction list with commands from current VM spec
Current NEO documentation lists them:
https://docs.neo.org/docs/en-us/tooldev/advanced/neo_vm.html

CALL_* instructions were left out because of conflict with golint (but they're
removed in NEO 3.0 anyway, so wasting time on them makes no sense).

Update autogenerated instruction_string.go accordingly.
2019-09-08 20:46:35 +03:00
Evgenii
bcc8234155 vm: implement Array <-> Struct conversion
Reference VM implementation supports convertation from
Struct to Array via NEWARRAY and vice versa.
https://github.com/neo-project/neo-vm/pull/91
2019-09-08 13:40:21 +03:00
Roman Khimov
aefe572df3 vm: implement UNPACK, REVERSE, REMOVE opcodes
Also expand makeStackItem() to accept slices of int for testing
convenience. Fixes #195.
2019-09-06 19:00:34 +03:00
Roman Khimov
b3ed3d24ee vm: implement CAT, SUBSTR, LEFT and RIGHT
String instruction set.
2019-09-06 12:41:27 +03:00
Roman Khimov
3f40334979 vm: add generic stub for all unimplemented instructions 2019-09-05 17:35:30 +03:00
Roman Khimov
59de72f446 vm: implement INVERT instruction 2019-09-05 17:35:30 +03:00
Roman Khimov
b494e094c0 vm: add XDROP implementation 2019-09-05 17:35:30 +03:00
Roman Khimov
974f5db6bc vm: add a TUCK implementation with tests
Also fix stack's InsertAt for the edge case of inserting into a position that
currently is empty (the first good TUCK test illustrates this).
2019-09-05 17:35:30 +03:00
Roman Khimov
eb224aeebe vm: add some checks for OVER and PICK, add OVER tests
These actually behaved correctly because of deferred sigsegv recover, but I
think it would be nice to print something more meaningful for users.
2019-09-05 17:35:30 +03:00
Roman Khimov
85831e3e92 vm: fix XTUCK implementation, add tests
The code that we have actually implements XTUCK and not TUCK. And it's a bit
broken, so fix it and add some tests. The most interesting one (that required
to touch stack code) is the one when we have 1 element on the stack and are
trying to tell XTUCK to push 2 elements deep.
2019-09-05 17:34:25 +03:00
Roman Khimov
5f0f9e1638 vm: implement PICK instruction 2019-09-05 15:18:04 +03:00
Roman Khimov
fcf9c1213b vm: implement the NZ opcode 2019-09-05 15:05:44 +03:00
Roman Khimov
a9b9c9226d *: add/fix godoc comments to satisfy golint
Fixes things like:
 * exported type/method/function X should have comment or be unexported
 * comment on exported type/method/function X should be of the form "X ..."
   (with optional leading article)

Refs. #213.
2019-09-03 17:57:51 +03:00
Roman Khimov
428e789ddc vm: produce better error for ROLL with wrong index
Current VM implementation doesn't return errors for many operations, so the
only way to handle it here is to check for NULL. Refs. #96.
2019-08-31 09:04:59 +03:00
Roman Khimov
ec7e17ffa6 pkg: make use of the new crypto/hash package
Simplifies a lot of code and removes some duplication. Unfortunately I had to
move test_util random functions in same commit to avoid cycle
dependencies. One of these random functions was also used in core/transaction
testing, to simplify things I've just dropped it there and used a static
string (which is nice to have for a test anyway).

There is still sha256 left in wallet (but it needs to pass Hash structure into
the signing function).
2019-08-26 13:32:19 +03:00
Roman Khimov
0309cff5a2 vm: implement EQUAL via reflection
Fixes failing tests.
2019-08-20 19:46:52 +03:00
Roman Khimov
33c512032f vm: switch from Opcode to Instruction
Which matches the changes done in neo-storm and also make this codebase closer
to the `dev` branch (that also uses Instruction).
2019-08-14 15:40:31 +03:00
57cb289bcd make State a set as in reference C# implementation (#123)
* make State a set as in reference C# implementation

* fix issues
2019-02-19 12:47:25 +01:00
Evgeniy Kulikov
67cbcac643 Fix typos (#133)
* Fix typos

* revert chains/unit_testnet

* revert chains

* fix review comments (thx @AlexVanin)
2019-02-13 18:01:10 +00:00
Evgeniy Kulikov
630919bf7d Fix typos and warnings for GoReport / GolangCiLinter (#132)
- typos
- gofmt -s
- govet warnings
- golangci-lint run
2019-02-09 16:53:58 +01:00
Evgeniy Kulikov
f000b76879 [FIX] Formatting and code-style (#118)
* [FIX] Formatting and code-style

- gofmt
- import resort
- prealloc slices
- simplify code

* fix vet
2019-01-25 12:20:35 +01:00
Anthony De Meulemeester
648563c3e2
Compiler (#73)
Compiler and VM update
2018-04-22 20:11:37 +02:00
Anthony De Meulemeester
4bd5b2812e
Optimisations and API changes for smart contracts (#67)
* support VM to pass method and arguments to a script.

* added support for type assertions in smartcontracts.

* added native vm support for print.

* moved VM API packages to vm -> API

* reverted the native Print opcode in favor of runtime.Log

* added support for registering custom interop hooks in the VM.

* Updated README

* Updated compiler with @OPTIMIZE tags

* Moved more tests to VM package.

* optimized and refactored compiler and vm API

* updated README with new smartcontract apis

* bumped version
2018-04-10 11:45:31 +02:00
Anthony De Meulemeester
5b5a7106c1
Fix append for bytearrays (#64) 2018-04-05 10:35:33 +02:00
Anthony De Meulemeester
941bd7e728
VM and compiler update (#63)
* renamed test folders and fixed bug where wrong jump labels would be exectuted for rewrite.

* Added support for Osize (len(string)) and factored out the array tests

* Added current instruction number to VM prompt if program is loaded.

* added support for unary expressions.

* updated README of and sorted the help commands

* updated readme of the compiler

* bumped version -> 0.39.0
2018-04-04 21:41:19 +02:00
Anthony De Meulemeester
69c3e645b6
VM improvements, tests + bugfixes (#61)
* changed vm commands to match more of the standard

* fixed Uint16 jmp bug in VM

* moved test to vm + fixed numnotequal bug

* fixed broken tests

* moved compiler tests to vm tests

* added basic for support + inc and dec stmts

* bumped version
2018-04-02 17:04:42 +02:00
Anthony De Meulemeester
931388b687
Cross platform virtual machine implementation (#60)
* Virtual machine for the NEO blockhain.

* fixed big.Int numeric operation pointer issue.

* added appcall

* Added README for vm package.

* removed main.go

* started VM cli (prompt) integration

* added support for printing the stack.

* moved cli to vm package

* fixed vet errors

* updated readme

* added more test for VM and fixed some edge cases.

* bumped version -> 0.37.0
2018-03-30 18:15:06 +02:00