1package backend
 2
 3import "github.com/tetratelabs/wazero/internal/engine/wazevo/ssa"
 4
 5// GoFunctionCallRequiredStackSize returns the size of the stack required for the Go function call.
 6// argBegin is the index of the first argument in the signature which is not either execution context or module context.
 7func GoFunctionCallRequiredStackSize(sig *ssa.Signature, argBegin int) (ret, retUnaligned int64) {
 8	var paramNeededInBytes, resultNeededInBytes int64
 9	for _, p := range sig.Params[argBegin:] {
10		s := int64(p.Size())
11		if s < 8 {
12			s = 8 // We use uint64 for all basic types, except SIMD v128.
13		}
14		paramNeededInBytes += s
15	}
16	for _, r := range sig.Results {
17		s := int64(r.Size())
18		if s < 8 {
19			s = 8 // We use uint64 for all basic types, except SIMD v128.
20		}
21		resultNeededInBytes += s
22	}
23
24	if paramNeededInBytes > resultNeededInBytes {
25		ret = paramNeededInBytes
26	} else {
27		ret = resultNeededInBytes
28	}
29	retUnaligned = ret
30	// Align to 16 bytes.
31	ret = (ret + 15) &^ 15
32	return
33}