core: vm: sqlvm: runtime entrypoing error handling

Return error.Error to reveal more information about returned error.

3 files changed, 14 insertions, 5 deletions

diff --git a/core/vm/sqlvm/errors/errors.go b/core/vm/sqlvm/errors/errors.go
index f6b91ebae..6062ae5d9 100644
--- a/core/vm/sqlvm/errors/errors.go
+++ b/core/vm/sqlvm/errors/errors.go
@@ -63,11 +63,13 @@ const (
 	ErrorCategorNil ErrorCategory = iota
 	ErrorCategoryGrammar
 	ErrorCategorySemantic
+	ErrorCategoryRuntime
 )
 
 var errorCategoryMap = [...]string{
 	ErrorCategoryGrammar:  "grammar",
 	ErrorCategorySemantic: "semantic",
+	ErrorCategoryRuntime:  "runtime",
 }
 
 func (c ErrorCategory) Error() string {
diff --git a/core/vm/sqlvm/runtime/instructions.go b/core/vm/sqlvm/runtime/instructions.go
index b5d98f956..9ecc41231 100644
--- a/core/vm/sqlvm/runtime/instructions.go
+++ b/core/vm/sqlvm/runtime/instructions.go
@@ -18,9 +18,10 @@ type OpFunction func(ctx *common.Context, ops []*Operand, registers []*Operand,
 // Instruction represents single instruction with essential information
 // collection.
 type Instruction struct {
-	Op     OpCode
-	Input  []*Operand
-	Output int
+	Op       OpCode
+	Input    []*Operand
+	Output   int
+	Position uint32 // ast tree position
 }
 
 // Raw with embedded big.Int value or byte slice which represents the real value
diff --git a/core/vm/sqlvm/runtime/runtime.go b/core/vm/sqlvm/runtime/runtime.go
index 3ea12f119..a8f8db7ee 100644
--- a/core/vm/sqlvm/runtime/runtime.go
+++ b/core/vm/sqlvm/runtime/runtime.go
@@ -3,14 +3,20 @@ package runtime
 import (
 	"github.com/dexon-foundation/dexon/core/vm"
 	"github.com/dexon-foundation/dexon/core/vm/sqlvm/common"
+	"github.com/dexon-foundation/dexon/core/vm/sqlvm/errors"
 )
 
 // Run is runtime entrypoint.
 func Run(stateDB vm.StateDB, ins []Instruction, registers []*Operand) (ret []byte, err error) {
 	for _, in := range ins {
 		opFunc := jumpTable[in.Op]
-		err = opFunc(&common.Context{}, in.Input, registers, in.Output)
-		if err != nil {
+		errCode := opFunc(&common.Context{}, in.Input, registers, in.Output)
+		if errCode != nil {
+			err = errors.Error{
+				Position: in.Position,
+				Code:     errCode.(errors.ErrorCode),
+				Category: errors.ErrorCategoryRuntime,
+			}
 			return nil, err
 		}
 	}