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Merge branch '5.1.x'

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This commit is contained in:
Juergen Hoeller
2019-05-02 17:52:12 +02:00
parent 8a57997d21 f359c117d3
commit ce9162065c
6 changed files with 104 additions and 99 deletions
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44
spring-expression/src/main/java/org/springframework/expression/spel/ast/Operator.java
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@@ -140,68 +140,68 @@ public abstract class Operator extends SpelNodeImpl {
// This code block checks whether the left or right operand is null and handles
// those cases before letting the original code (that only handled actual numbers) run
Label rightIsNonNull = new Label();
mv.visitInsn(DUP); // stack: left/right/right
mv.visitJumpInsn(IFNONNULL, rightIsNonNull); // stack: left/right
mv.visitInsn(DUP); // stack: left/right/right
mv.visitJumpInsn(IFNONNULL, rightIsNonNull); // stack: left/right
// here: RIGHT==null LEFT==unknown
mv.visitInsn(SWAP); // right/left
mv.visitInsn(SWAP); // right/left
Label leftNotNullRightIsNull = new Label();
mv.visitJumpInsn(IFNONNULL, leftNotNullRightIsNull); // stack: right
mv.visitJumpInsn(IFNONNULL, leftNotNullRightIsNull); // stack: right
// here: RIGHT==null LEFT==null
mv.visitInsn(POP); // stack: <nothing>
mv.visitInsn(POP); // stack: <nothing>
// load 0 or 1 depending on comparison instruction
switch (compInstruction1) {
case IFGE: // OpLT
case IFLE: // OpGT
mv.visitInsn(ICONST_0); // false - null is not < or > null
mv.visitInsn(ICONST_0); // false - null is not < or > null
break;
case IFGT: // OpLE
case IFLT: // OpGE
mv.visitInsn(ICONST_1); // true - null is <= or >= null
mv.visitInsn(ICONST_1); // true - null is <= or >= null
break;
default:
throw new IllegalStateException("Unsupported: "+compInstruction1);
throw new IllegalStateException("Unsupported: " + compInstruction1);
}
mv.visitJumpInsn(GOTO, endOfIf);
mv.visitLabel(leftNotNullRightIsNull); // stack: right
mv.visitLabel(leftNotNullRightIsNull); // stack: right
// RIGHT==null LEFT!=null
mv.visitInsn(POP); // stack: <nothing>
mv.visitInsn(POP); // stack: <nothing>
// load 0 or 1 depending on comparison instruction
switch (compInstruction1) {
case IFGE: // OpLT
case IFGT: // OpLE
mv.visitInsn(ICONST_0); // false - something is not < or <= null
mv.visitInsn(ICONST_0); // false - something is not < or <= null
break;
case IFLE: // OpGT
case IFLT: // OpGE
mv.visitInsn(ICONST_1); // true - something is > or >= null
mv.visitInsn(ICONST_1); // true - something is > or >= null
break;
default:
throw new IllegalStateException("Unsupported: "+compInstruction1);
throw new IllegalStateException("Unsupported: " + compInstruction1);
}
mv.visitJumpInsn(GOTO, endOfIf);
mv.visitLabel(rightIsNonNull); // stack: left/right
mv.visitLabel(rightIsNonNull); // stack: left/right
// here: RIGHT!=null LEFT==unknown
mv.visitInsn(SWAP); // stack: right/left
mv.visitInsn(DUP); // stack: right/left/left
mv.visitInsn(SWAP); // stack: right/left
mv.visitInsn(DUP); // stack: right/left/left
Label neitherRightNorLeftAreNull = new Label();
mv.visitJumpInsn(IFNONNULL, neitherRightNorLeftAreNull); // stack: right/left
mv.visitJumpInsn(IFNONNULL, neitherRightNorLeftAreNull); // stack: right/left
// here: RIGHT!=null LEFT==null
mv.visitInsn(POP2); // stack: <nothing>
mv.visitInsn(POP2); // stack: <nothing>
switch (compInstruction1) {
case IFGE: // OpLT
case IFGT: // OpLE
mv.visitInsn(ICONST_1); // true - null is < or <= something
mv.visitInsn(ICONST_1); // true - null is < or <= something
break;
case IFLE: // OpGT
case IFLT: // OpGE
mv.visitInsn(ICONST_0); // false - null is not > or >= something
mv.visitInsn(ICONST_0); // false - null is not > or >= something
break;
default:
throw new IllegalStateException("Unsupported: "+compInstruction1);
throw new IllegalStateException("Unsupported: " + compInstruction1);
}
mv.visitJumpInsn(GOTO, endOfIf);
mv.visitLabel(neitherRightNorLeftAreNull); // stack: right/left
mv.visitLabel(neitherRightNorLeftAreNull); // stack: right/left
// neither were null so unbox and proceed with numeric comparison
if (unboxLeft) {
CodeFlow.insertUnboxInsns(mv, targetType, leftDesc);