From f5af1fdca8dc7d44b4c2025195c19819886729b6 Mon Sep 17 00:00:00 2001 From: obscuren Date: Tue, 19 May 2015 17:26:38 +0200 Subject: core/vm: RETURN op code returns pointer to memory rather than copy --- core/vm/memory.go | 12 ++++++++++++ core/vm/vm.go | 2 +- 2 files changed, 13 insertions(+), 1 deletion(-) (limited to 'core') diff --git a/core/vm/memory.go b/core/vm/memory.go index b77d486eb..d20aa9591 100644 --- a/core/vm/memory.go +++ b/core/vm/memory.go @@ -49,6 +49,18 @@ func (self *Memory) Get(offset, size int64) (cpy []byte) { return } +func (self *Memory) GetPtr(offset, size int64) []byte { + if size == 0 { + return nil + } + + if len(self.store) > int(offset) { + return self.store[offset : offset+size] + } + + return nil +} + func (m *Memory) Len() int { return len(m.store) } diff --git a/core/vm/vm.go b/core/vm/vm.go index 927b67293..35fa19d03 100644 --- a/core/vm/vm.go +++ b/core/vm/vm.go @@ -695,7 +695,7 @@ func (self *Vm) Run(context *Context, callData []byte) (ret []byte, err error) { self.Printf("resume %x (%v)", context.Address(), context.Gas) case RETURN: offset, size := stack.pop(), stack.pop() - ret := mem.Get(offset.Int64(), size.Int64()) + ret := mem.GetPtr(offset.Int64(), size.Int64()) self.Printf(" => [%v, %v] (%d) 0x%x", offset, size, len(ret), ret).Endl() -- cgit v1.2.3