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Polishing

This commit is contained in:
Juergen Hoeller 2018-06-29 22:43:13 +02:00
parent ea534b6820
commit 214fa9c2a0
1 changed files with 38 additions and 39 deletions
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77
spring-expression/src/main/java/org/springframework/expression/spel/CodeFlow.java
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@ -348,72 +348,72 @@ public class CodeFlow implements Opcodes {
public static void insertAnyNecessaryTypeConversionBytecodes(MethodVisitor mv, char targetDescriptor, String stackDescriptor) { public static void insertAnyNecessaryTypeConversionBytecodes(MethodVisitor mv, char targetDescriptor, String stackDescriptor) {
if (CodeFlow.isPrimitive(stackDescriptor)) { if (CodeFlow.isPrimitive(stackDescriptor)) {
char stackTop = stackDescriptor.charAt(0); char stackTop = stackDescriptor.charAt(0);
if (stackTop=='I' || stackTop=='B' || stackTop=='S' || stackTop=='C') { if (stackTop == 'I' || stackTop == 'B' || stackTop == 'S' || stackTop == 'C') {
if (targetDescriptor=='D') { if (targetDescriptor == 'D') {
mv.visitInsn(I2D); mv.visitInsn(I2D);
} }
else if (targetDescriptor=='F') { else if (targetDescriptor == 'F') {
mv.visitInsn(I2F); mv.visitInsn(I2F);
} }
else if (targetDescriptor=='J') { else if (targetDescriptor == 'J') {
mv.visitInsn(I2L); mv.visitInsn(I2L);
} }
else if (targetDescriptor=='I') { else if (targetDescriptor == 'I') {
// nop // nop
} }
else { else {
throw new IllegalStateException("cannot get from "+stackTop+" to "+targetDescriptor); throw new IllegalStateException("Cannot get from " + stackTop + " to " + targetDescriptor);
} }
} }
else if (stackTop=='J') { else if (stackTop == 'J') {
if (targetDescriptor=='D') { if (targetDescriptor == 'D') {
mv.visitInsn(L2D); mv.visitInsn(L2D);
} }
else if (targetDescriptor=='F') { else if (targetDescriptor == 'F') {
mv.visitInsn(L2F); mv.visitInsn(L2F);
} }
else if (targetDescriptor=='J') { else if (targetDescriptor == 'J') {
// nop // nop
} }
else if (targetDescriptor=='I') { else if (targetDescriptor == 'I') {
mv.visitInsn(L2I); mv.visitInsn(L2I);
} }
else { else {
throw new IllegalStateException("cannot get from "+stackTop+" to "+targetDescriptor); throw new IllegalStateException("Cannot get from " + stackTop + " to " + targetDescriptor);
} }
} }
else if (stackTop=='F') { else if (stackTop == 'F') {
if (targetDescriptor=='D') { if (targetDescriptor == 'D') {
mv.visitInsn(F2D); mv.visitInsn(F2D);
} }
else if (targetDescriptor=='F') { else if (targetDescriptor == 'F') {
// nop // nop
} }
else if (targetDescriptor=='J') { else if (targetDescriptor == 'J') {
mv.visitInsn(F2L); mv.visitInsn(F2L);
} }
else if (targetDescriptor=='I') { else if (targetDescriptor == 'I') {
mv.visitInsn(F2I); mv.visitInsn(F2I);
} }
else { else {
throw new IllegalStateException("cannot get from "+stackTop+" to "+targetDescriptor); throw new IllegalStateException("Cannot get from " + stackTop + " to " + targetDescriptor);
} }
} }
else if (stackTop=='D') { else if (stackTop == 'D') {
if (targetDescriptor=='D') { if (targetDescriptor == 'D') {
// nop // nop
} }
else if (targetDescriptor=='F') { else if (targetDescriptor == 'F') {
mv.visitInsn(D2F); mv.visitInsn(D2F);
} }
else if (targetDescriptor=='J') { else if (targetDescriptor == 'J') {
mv.visitInsn(D2L); mv.visitInsn(D2L);
} }
else if (targetDescriptor=='I') { else if (targetDescriptor == 'I') {
mv.visitInsn(D2I); mv.visitInsn(D2I);
} }
else { else {
throw new IllegalStateException("cannot get from "+stackDescriptor+" to "+targetDescriptor); throw new IllegalStateException("Cannot get from " + stackDescriptor + " to " + targetDescriptor);
} }
} }
} }
@ -530,7 +530,7 @@ public class CodeFlow implements Opcodes {
} }
/** /**
* Returns if the descriptor is for a boolean primitive or boolean reference type. * Determine whether the descriptor is for a boolean primitive or boolean reference type.
* @param descriptor type descriptor * @param descriptor type descriptor
* @return {@code true} if the descriptor is boolean compatible * @return {@code true} if the descriptor is boolean compatible
*/ */
@ -539,7 +539,7 @@ public class CodeFlow implements Opcodes {
} }
/** /**
* Returns if the descriptor is for a primitive type. * Determine whether the descriptor is for a primitive type.
* @param descriptor type descriptor * @param descriptor type descriptor
* @return {@code true} if a primitive type * @return {@code true} if a primitive type
*/ */
@ -548,7 +548,7 @@ public class CodeFlow implements Opcodes {
} }
/** /**
* Returns if the descriptor is for a primitive array (e.g. "[[I"). * Determine whether the descriptor is for a primitive array (e.g. "[[I").
* @param descriptor the descriptor for a possible primitive array * @param descriptor the descriptor for a possible primitive array
* @return {@code true} if the descriptor a primitive array * @return {@code true} if the descriptor a primitive array
*/ */
@ -569,8 +569,8 @@ public class CodeFlow implements Opcodes {
} }
/** /**
* Determine if boxing/unboxing can get from one type to the other. Assumes at least * Determine whether boxing/unboxing can get from one type to the other.
* one of the types is in boxed form (i.e. single char descriptor). * Assumes at least one of the types is in boxed form (i.e. single char descriptor).
* @return {@code true} if it is possible to get (via boxing) from one descriptor to the other * @return {@code true} if it is possible to get (via boxing) from one descriptor to the other
*/ */
public static boolean areBoxingCompatible(String desc1, String desc2) { public static boolean areBoxingCompatible(String desc1, String desc2) {
@ -781,9 +781,8 @@ public class CodeFlow implements Opcodes {
} }
/** /**
* Deduce the descriptor for a type. Descriptors are like JVM type names but missing * Deduce the descriptor for a type. Descriptors are like JVM type names but missing the
* the trailing ';' so for Object the descriptor is "Ljava/lang/Object" for int it is * trailing ';' so for Object the descriptor is "Ljava/lang/Object" for int it is "I".
* "I".
* @param type the type (may be primitive) for which to determine the descriptor * @param type the type (may be primitive) for which to determine the descriptor
* @return the descriptor * @return the descriptor
*/ */
@ -957,7 +956,7 @@ public class CodeFlow implements Opcodes {
case 'S': return T_SHORT; case 'S': return T_SHORT;
case 'Z': return T_BOOLEAN; case 'Z': return T_BOOLEAN;
default: default:
throw new IllegalArgumentException("Unexpected arraytype "+arraytype.charAt(0)); throw new IllegalArgumentException("Unexpected arraytype " + arraytype.charAt(0));
} }
} }
@ -971,7 +970,7 @@ public class CodeFlow implements Opcodes {
if (ch == '[') { if (ch == '[') {
continue; continue;
} }
return ch=='L'; return (ch == 'L');
} }
return false; return false;
} }
@ -991,10 +990,10 @@ public class CodeFlow implements Opcodes {
} }
else { else {
if (arraytype.charAt(0) == '[') { if (arraytype.charAt(0) == '[') {
// Handling the nested array case here. If vararg // Handling the nested array case here.
// is [[I then we want [I and not [I; // If vararg is [[I then we want [I and not [I;
if (CodeFlow.isReferenceTypeArray(arraytype)) { if (CodeFlow.isReferenceTypeArray(arraytype)) {
mv.visitTypeInsn(ANEWARRAY, arraytype+";"); mv.visitTypeInsn(ANEWARRAY, arraytype + ";");
} }
else { else {
mv.visitTypeInsn(ANEWARRAY, arraytype); mv.visitTypeInsn(ANEWARRAY, arraytype);
@ -1026,7 +1025,7 @@ public class CodeFlow implements Opcodes {
} }
} }
public static final String toBoxedDescriptor(String primitiveDescriptor) { public static String toBoxedDescriptor(String primitiveDescriptor) {
switch (primitiveDescriptor.charAt(0)) { switch (primitiveDescriptor.charAt(0)) {
case 'I': return "Ljava/lang/Integer"; case 'I': return "Ljava/lang/Integer";
case 'J': return "Ljava/lang/Long"; case 'J': return "Ljava/lang/Long";
@ -1037,7 +1036,7 @@ public class CodeFlow implements Opcodes {
case 'S': return "Ljava/lang/Short"; case 'S': return "Ljava/lang/Short";
case 'Z': return "Ljava/lang/Boolean"; case 'Z': return "Ljava/lang/Boolean";
default: default:
throw new IllegalArgumentException("Unexpected non primitive descriptor "+primitiveDescriptor); throw new IllegalArgumentException("Unexpected non primitive descriptor " + primitiveDescriptor);
} }
} }