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evmc: Load VM dynamically

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This commit is contained in:
Paweł Bylica 2018-06-21 14:54:29 +02:00
parent d1439fdc92
commit 68eea63083
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GPG key ID: 7A0C037434FE77EF
1 changed files with 53 additions and 5 deletions
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58
core/vm/evmjit.go
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@ -18,8 +18,9 @@ package vm
/*
#include <libaleth-interpreter/interpreter.h>
#include <evmc/evmc.h>
#include <stdlib.h>
#include <dlfcn.h>
static const struct evmc_context_fn_table* get_context_fn_table()
@ -80,8 +81,16 @@ static void add_result_releaser(struct evmc_result* result)
result->release = free_result_output;
}
#cgo CFLAGS: -I/home/chfast/Projects/ethereum/cpp-ethereum -I/home/chfast/Projects/ethereum/cpp-ethereum/evmc/include
#cgo LDFLAGS: -laleth-interpreter -lstdc++ -lm -ldl -L/home/chfast/Projects/ethereum/cpp-ethereum/build/interpreter/libaleth-interpreter
typedef struct evmc_instance* (*evmc_create_fn)();
static struct evmc_instance* create(void* create_symbol)
{
evmc_create_fn fn = (evmc_create_fn)create_symbol;
return fn();
}
#cgo CFLAGS: -I/home/chfast/Projects/ethereum/cpp-ethereum/evmc/include
#cgo LDFLAGS: -ldl
*/
import "C"
@ -96,6 +105,7 @@ import (
"github.com/ethereum/go-ethereum/common"
"github.com/ethereum/go-ethereum/crypto"
"github.com/ethereum/go-ethereum/params"
"github.com/ethereum/go-ethereum/log"
)
type EVMJIT struct {
@ -116,9 +126,47 @@ type ContextWrapper struct {
index int
}
var loadMu sync.Mutex
var createSymbol unsafe.Pointer
var loaded = false
func loadVM(path string) {
if len(path) == 0 {
panic("EVMC path not provided, use --vm flag")
}
loadMu.Lock()
defer loadMu.Unlock()
if loaded {
return
}
cpath := C.CString(path)
defer C.free(unsafe.Pointer(cpath))
handle := C.dlopen(cpath, C.RTLD_LAZY)
if handle == nil {
panic(fmt.Sprintf("cannot open %s", path))
}
centrypoint := C.CString("evmc_create")
defer C.free(unsafe.Pointer((centrypoint)))
C.dlerror()
createSymbol = C.dlsym(handle, centrypoint)
err := C.dlerror()
if err != nil {
panic(fmt.Sprintf("cannot find evmc_create in %s", path))
}
loaded = true
log.Info("EVMC VM loaded", "path", path)
}
func NewJit(env *EVM, cfg Config) *EVMJIT {
// FIXME: Destroy the jit later.
return &EVMJIT{C.evmc_create_interpreter(), env, nil, false, nil}
loadVM(cfg.EVMCPath)
// FIXME: Destroy the instance later.
// FIXME: Create the instance once.
return &EVMJIT{C.create(createSymbol), env, nil, false, nil}
}