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https://github.com/nspcc-dev/neo-go.git
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91b36657d6
If variable is unnamed and does not contain function call then it's treated as unused and code generation may be omitted for it initialization/declaration.
76 lines
2.3 KiB
Go
76 lines
2.3 KiB
Go
package compiler_test
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import (
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"math/big"
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"testing"
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"github.com/nspcc-dev/neo-go/pkg/vm/opcode"
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)
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func TestGenDeclWithMultiRet(t *testing.T) {
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t.Run("global var decl", func(t *testing.T) {
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src := `package foo
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func Main() int {
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var a, b = f()
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return a + b
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}
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func f() (int, int) {
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return 1, 2
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}`
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eval(t, src, big.NewInt(3))
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})
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t.Run("local var decl", func(t *testing.T) {
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src := `package foo
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var a, b = f()
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func Main() int {
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return a + b
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}
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func f() (int, int) {
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return 1, 2
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}`
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eval(t, src, big.NewInt(3))
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})
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}
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func TestUnderscoreLocalVarDontEmitCode(t *testing.T) {
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src := `package foo
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type Foo struct { Int int }
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func Main() int {
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var _ int
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var _ = 1
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var (
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A = 2
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_ = A + 3
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_, B, _ = 4, 5, 6
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_, _, _ = f(A, B) // unused, but has function call, so the code is expected
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_, C, _ = f(A, B)
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)
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var D = 7 // unused but named, so the code is expected
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_ = D
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var _ = Foo{ Int: 5 }
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var fo = Foo{ Int: 3 }
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var _ = 1 + A + fo.Int
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var _ = fo.GetInt() // unused, but has method call, so the code is expected
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return C
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}
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func f(a, b int) (int, int, int) {
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return 8, 9, 10
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}
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func (fo Foo) GetInt() int {
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return fo.Int
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}`
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eval(t, src, big.NewInt(9), []interface{}{opcode.INITSLOT, []byte{5, 0}}, // local slot for A, B, C, D, fo
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opcode.PUSH2, opcode.STLOC0, // store A
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opcode.PUSH5, opcode.STLOC1, // store B
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opcode.LDLOC0, opcode.LDLOC1, opcode.SWAP, []interface{}{opcode.CALL, []byte{27}}, // evaluate f() first time
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opcode.DROP, opcode.DROP, opcode.DROP, // drop all values from f
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opcode.LDLOC0, opcode.LDLOC1, opcode.SWAP, []interface{}{opcode.CALL, []byte{19}}, // evaluate f() second time
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opcode.DROP, opcode.STLOC2, opcode.DROP, // store C
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opcode.PUSH7, opcode.STLOC3, // store D
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opcode.LDLOC3, opcode.DROP, // empty assignment
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opcode.PUSH3, opcode.PUSH1, opcode.PACKSTRUCT, opcode.STLOC4, // fo decl
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opcode.LDLOC4, []interface{}{opcode.CALL, []byte{12}}, opcode.DROP, // fo.GetInt()
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opcode.LDLOC2, opcode.RET, // return C
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[]interface{}{opcode.INITSLOT, []byte{0, 2}}, opcode.PUSH10, opcode.PUSH9, opcode.PUSH8, opcode.RET, // f
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[]interface{}{opcode.INITSLOT, []byte{0, 1}}, opcode.LDARG0, opcode.PUSH0, opcode.PICKITEM, opcode.RET) // (fo Foo) GetInt() int
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}
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