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16-byte align frames on the VMFrameStack

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- Fixed: Don't assume operator new will return a pointer with 16-byte
  alignment when allocating a block for the VMFrameStack. Because it seems
  it's actually guaranteed to be 8-byte aligned. Don't know where I got
  the idea it would always be 16-byte aligned.
This commit is contained in:
Randy Heit 2015-01-10 23:00:45 -06:00
parent 649875b17e
commit 9b81e0e597
2 changed files with 8 additions and 2 deletions
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6
src/zscript/vm.h
View file

@ -682,6 +682,7 @@ struct VMFrame
VMValue *GetParam() const
{
assert(((size_t)this & 15) == 0 && "VM frame is unaligned");
return (VMValue *)(((size_t)(this + 1) + 15) & ~15);
}
@ -789,6 +790,11 @@ private:
VMFrame *LastFrame;
VM_UBYTE *FreeSpace;
int BlockSize;
void InitFreeSpace()
{
FreeSpace = (VM_UBYTE *)(((size_t)(this + 1) + 15) & ~15);
}
};
BlockHeader *Blocks;
BlockHeader *UnusedBlocks;

4
src/zscript/vmframe.cpp
View file

@ -286,7 +286,7 @@ VMFrame *VMFrameStack::Alloc(int size)
block = (BlockHeader *)new VM_UBYTE[blocksize];
block->BlockSize = blocksize;
}
block->FreeSpace = (VM_UBYTE *)block + ((sizeof(BlockHeader) + 15) & ~15);
block->InitFreeSpace();
block->LastFrame = NULL;
block->NextBlock = Blocks;
Blocks = block;
@ -340,7 +340,7 @@ VMFrame *VMFrameStack::PopFrame()
{
assert(Blocks->NextBlock == NULL);
Blocks->LastFrame = NULL;
Blocks->FreeSpace = (VM_UBYTE *)Blocks + ((sizeof(BlockHeader) + 15) & ~15);
Blocks->InitFreeSpace();
}
return NULL;
}