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#pragma once
#include "Core/Object.h"
#include "Core/Array.h"
#include "Reg.h"
#include "Listing.h"
namespace code {
STORM_PKG(core.asm);
class Arena;
/**
* Computes and tracks the register usage for instructions in a listing. Each entry tracks the
* registers that need to be preserved before each instruction. Ignores ptrStack and ptrFrame.
*/
class UsedRegs {
STORM_VALUE;
public:
STORM_CTOR UsedRegs(Array<RegSet *> *used, RegSet *all);
Array<RegSet *> *used;
RegSet *all;
};
// Computes the used registers which needs to be preserved before each instruction in a
// listing. Ignores ptrStack and ptrFrame.
UsedRegs STORM_FN usedRegs(MAYBE(const Arena *) arena, const Listing *src);
// Computes all used registers, without bothering about per-line representations.
RegSet *STORM_FN allUsedRegs(const Listing *src);
namespace impl {
/**
* Work-list used internally when computing used registers.
*/
class WorkItem : public Object {
STORM_CLASS;
public:
WorkItem(Nat line);
WorkItem(Nat line, WorkItem *nextDep);
// Line to start at.
Nat line;
// Inside the work-list?
Bool inWork;
// Next item in the dependency list.
WorkItem *nextDep;
// Next item in the work list.
WorkItem *nextWork;
};
}
}
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