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core/vm: customisable jump table

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This commit is contained in:
Jeffrey Wilcke 2017-01-04 13:57:10 +01:00
parent f02b4012c9
commit 007cae717f
2 changed files with 819 additions and 804 deletions
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1610
core/vm/jump_table.go
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13
core/vm/vm.go
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@ -44,6 +44,10 @@ type Config struct {
NoRecursion bool NoRecursion bool
// Disable gas metering // Disable gas metering
DisableGasMetering bool DisableGasMetering bool
// JumpTable contains the EVM instruction table. This
// may me left uninitialised and will be set the default
// table.
JumpTable [256]operation
} }
// Interpreter is used to run Ethereum based contracts and will utilise the // Interpreter is used to run Ethereum based contracts and will utilise the
@ -58,6 +62,13 @@ type Interpreter struct {
// NewInterpreter returns a new instance of the Interpreter. // NewInterpreter returns a new instance of the Interpreter.
func NewInterpreter(env *EVM, cfg Config) *Interpreter { func NewInterpreter(env *EVM, cfg Config) *Interpreter {
// We use the STOP instruction whether to see
// the jump table was initialised. If it was not
// we'll set the default jump table.
if !cfg.JumpTable[STOP].valid {
cfg.JumpTable = defaultJumpTable
}
return &Interpreter{ return &Interpreter{
env: env, env: env,
cfg: cfg, cfg: cfg,
@ -121,7 +132,7 @@ func (evm *Interpreter) Run(contract *Contract, input []byte) (ret []byte, err e
op = contract.GetOp(pc) op = contract.GetOp(pc)
// get the operation from the jump table matching the opcode // get the operation from the jump table matching the opcode
operation := jumpTable[op] operation := evm.cfg.JumpTable[op]
// if the op is invalid abort the process and return an error // if the op is invalid abort the process and return an error
if !operation.valid { if !operation.valid {