package runtime

import "unsafe"

func sbrk(n uintptr) unsafe.Pointer {
	grow := divRoundUp(n, physPageSize)
	size := growMemory(int32(grow))
	if size < 0 {
		return nil
	}
	resetMemoryDataView()
	return unsafe.Pointer(uintptr(size) * physPageSize)
}

// Implemented in src/runtime/sys_wasm.s

	I64TruncF64U
	Return

TEXT runtime·exitThread(SB), NOSPLIT, $0-0
	UNDEF

TEXT runtime·osyield(SB), NOSPLIT, $0-0
	UNDEF

TEXT runtime·growMemory(SB), NOSPLIT, $0
	Get SP
	I32Load pages+0(FP)
	GrowMemory
	I32Store ret+8(FP)

	"I64Load16U",
	"I64Load32S",
	"I64Load32U",
	"I32Store",
	"I64Store",
	"F32Store",
	"F64Store",
	"I32Store8",
	"I32Store16",
	"I64Store8",
	"I64Store16",
	"I64Store32",
	"CurrentMemory",
	"GrowMemory",
	"I32Const",
	"I64Const",
	"F32Const",
	"F64Const",
	"I32Eqz",
	"I32Eq",
	"I32Ne",
	"I32LtS",
	"I32LtU",
	"I32GtS",
	"I32GtU",
	"I32LeS",
	"I32LeU",
	"I32GeS",
	"I32GeU",

}

// writeMemorySec writes the section that declares linear memories. Currently one linear memory is being used.
// Linear memory always starts at address zero. More memory can be requested with the GrowMemory instruction.
func writeMemorySec(ctxt *ld.Link, ldr *loader.Loader) {
	sizeOffset := writeSecHeader(ctxt, sectionMemory)

	dataSection := ldr.SymSect(ldr.Lookup("runtime.data", 0))

	AI64Load16S
	AI64Load16U
	AI64Load32S
	AI64Load32U
	AI32Store
	AI64Store
	AF32Store
	AF64Store
	AI32Store8
	AI32Store16
	AI64Store8
	AI64Store16
	AI64Store32
	ACurrentMemory
	AGrowMemory

	AI32Const
	AI64Const
	AF32Const
	AF64Const

	AI32Eqz
	AI32Eq
	AI32Ne
	AI32LtS
	AI32LtU
	AI32GtS
	AI32GtU
	AI32LeS
	AI32LeU
	AI32GeS
	AI32GeU

	AI64Eqz
	AI64Eq

			}
			if p.From.Offset > math.MaxUint32 {
				ctxt.Diag("bad offset in %v", p)
			}
			writeUleb128(w, align(p.As))
			writeUleb128(w, uint64(p.To.Offset))

		case ACurrentMemory, AGrowMemory, AMemoryFill:
			w.WriteByte(0x00)

		case AMemoryCopy:
			w.WriteByte(0x00)
			w.WriteByte(0x00)

		}
	}

	w.WriteByte(0x0b) // end

	s.P = w.Bytes()
}