63 lines
2.3 KiB
Go
63 lines
2.3 KiB
Go
package compiler
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import (
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"testing"
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"github.com/tetratelabs/wazero/internal/testing/require"
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"github.com/tetratelabs/wazero/internal/wazeroir"
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)
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// TestCompiler_conditional_value_saving ensure that saving conditional register works correctly even if there's
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// no free registers available.
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func TestCompiler_conditional_value_saving(t *testing.T) {
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env := newCompilerEnvironment()
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compiler := env.requireNewCompiler(t, newCompiler, nil)
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err := compiler.compilePreamble()
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require.NoError(t, err)
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// Place the f32 local.
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err = compiler.compileConstF32(wazeroir.OperationConstF32{Value: 1.0})
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require.NoError(t, err)
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// Generate constants to occupy all the unreserved GP registers.
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for i := 0; i < len(unreservedGeneralPurposeRegisters); i++ {
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err = compiler.compileConstI32(wazeroir.OperationConstI32{Value: 100})
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require.NoError(t, err)
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}
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// Pick the f32 floating point local (1.0) twice.
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// Note that the f32 (function local variable in general) is placed above the call frame.
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err = compiler.compilePick(wazeroir.OperationPick{Depth: int(compiler.runtimeValueLocationStack().sp - 1 - callFrameDataSizeInUint64)})
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require.NoError(t, err)
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err = compiler.compilePick(wazeroir.OperationPick{Depth: int(compiler.runtimeValueLocationStack().sp - 1 - callFrameDataSizeInUint64)})
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require.NoError(t, err)
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// Generate conditional flag via floating point comparisons.
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err = compiler.compileLe(wazeroir.OperationLe{Type: wazeroir.SignedTypeFloat32})
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require.NoError(t, err)
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// Ensures that we have conditional value at top of stack.
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l := compiler.runtimeValueLocationStack().peek()
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require.True(t, l.onConditionalRegister())
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// Ensures that no free registers are available.
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_, ok := compiler.runtimeValueLocationStack().takeFreeRegister(registerTypeGeneralPurpose)
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require.False(t, ok)
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// We should be able to use the conditional value (an i32 value in Wasm) as an operand for, say, i32.add.
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err = compiler.compileAdd(wazeroir.OperationAdd{Type: wazeroir.UnsignedTypeI32})
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require.NoError(t, err)
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err = compiler.compileReturnFunction()
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require.NoError(t, err)
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// Generate and run the code under test.
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code, _, err := compiler.compile()
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require.NoError(t, err)
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env.exec(code)
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// expect 101 = 100(== the integer const) + 1 (== flag value == the result of (1.0 <= 1.0))
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require.Equal(t, uint32(101), env.stackTopAsUint32())
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}
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