Start working on readCode but ... switch hell with constants :D

asm/classreader.go

@@ -777,7 +777,30 @@ func (c ClassReader) readMethod(classVisitor ClassVisitor, context *Context, met
 // ----------------------------------------------------------------------------------------------
 
 func (c ClassReader) readCode(methodVisitor MethodVisitor, context *Context, codeOffset int) {
-	//TODO
+	currentOffset := codeOffset
+	b := c.b
+	charBuffer := context.charBuffer
+	maxStack := c.readUnsignedShort(currentOffset)
+	maxLocals := c.readUnsignedShort(currentOffset + 2)
+	codeLength := c.readInt(currentOffset + 4)
+	currentOffset += 8
+
+	bytecodeStartOffset := currentOffset
+	bytecodeEndOffset := currentOffset + codeLength
+	context.currentMethodLabels = make([]*Label, codeLength+1)
+	labels := context.currentMethodLabels
+
+	for currentOffset < bytecodeEndOffset {
+		bytecodeOffset := currentOffset - bytecodeStartOffset
+		opcode := b[currentOffset] & 0xFF
+		switch opcode {
+		case opcodes.NOP, opcodes.ACONST_NULL, opcodes.ICONST_M1, opcodes.ICONST_0, opcodes.ICONST_1, opcodes.ICONST_2,
+			opcodes.ICONST_3, opcodes.ICONST_4, opcodes.ICONST_5, opcodes.LCONST_0, opcodes.LCONST_1, opcodes.FCONST_0, opcodes.FCONST_1,
+			opcodes.FCONST_2, opcodes.DCONST_0, opcodes.DCONST_1:
+			currentOffset++
+			break
+		}
+	}
 }
 
 func (c ClassReader) readLabel(bytecodeOffset int, labels []*Label) *Label {

asm/constants/constants.go

@@ -0,0 +1,102 @@
+package constants
+
+// ASM specific access flags.
+// WARNING: the 16 least significant bits must NOT be used, to avoid conflicts with standard
+// access flags, and also to make sure that these flags are automatically filtered out when
+// written in class files (because access flags are stored using 16 bits only).
+const ACC_CONSTRUCTOR = 0x40000 // method access flag.
+
+// ASM specific stack map frame types, used in {@link ClassVisitor#visitFrame}.
+
+/**
+ * A frame inserted between already existing frames. This internal stack map frame type (in
+ * addition to the ones declared in {@link Opcodes}) can only be used if the frame content can be
+ * computed from the previous existing frame and from the instructions between this existing frame
+ * and the inserted one, without any knowledge of the type hierarchy. This kind of frame is only
+ * used when an unconditional jump is inserted in a method while expanding an ASM specific
+ * instruction. Keep in sync with Opcodes.java.
+ */
+const F_INSERT = 256
+
+// The JVM opcode values which are not part of the ASM public API.
+// See https://docs.oracle.com/javase/specs/jvms/se9/html/jvms-6.html.
+const LDC_W = 19
+const LDC2_W = 20
+const ILOAD_0 = 26
+const ILOAD_1 = 27
+const ILOAD_2 = 28
+const ILOAD_3 = 29
+const LLOAD_0 = 30
+const LLOAD_1 = 31
+const LLOAD_2 = 32
+const LLOAD_3 = 33
+const FLOAD_0 = 34
+const FLOAD_1 = 35
+const FLOAD_2 = 36
+const FLOAD_3 = 37
+const DLOAD_0 = 38
+const DLOAD_1 = 39
+const DLOAD_2 = 40
+const DLOAD_3 = 41
+const ALOAD_0 = 42
+const ALOAD_1 = 43
+const ALOAD_2 = 44
+const ALOAD_3 = 45
+const ISTORE_0 = 59
+const ISTORE_1 = 60
+const ISTORE_2 = 61
+const ISTORE_3 = 62
+const LSTORE_0 = 63
+const LSTORE_1 = 64
+const LSTORE_2 = 65
+const LSTORE_3 = 66
+const FSTORE_0 = 67
+const FSTORE_1 = 68
+const FSTORE_2 = 69
+const FSTORE_3 = 70
+const DSTORE_0 = 71
+const DSTORE_1 = 72
+const DSTORE_2 = 73
+const DSTORE_3 = 74
+const ASTORE_0 = 75
+const ASTORE_1 = 76
+const ASTORE_2 = 77
+const ASTORE_3 = 78
+const WIDE = 196
+const GOTO_W = 200
+const JSR_W = 201
+
+// Constants to convert between normal and wide jump instructions.
+
+// The delta between the GOTO_W and JSR_W opcodes and GOTO and JUMP.
+const WIDE_JUMP_OPCODE_DELTA = GOTO_W - GOTO
+
+// Constants to convert JVM opcodes to the equivalent ASM specific opcodes, and vice versa.
+
+// The delta between the ASM_IFEQ, ..., ASM_IF_ACMPNE, ASM_GOTO and ASM_JSR opcodes
+// and IFEQ, ..., IF_ACMPNE, GOTO and JSR.
+const ASM_OPCODE_DELTA = 49
+
+// The delta between the ASM_IFNULL and ASM_IFNONNULL opcodes and IFNULL and IFNONNULL.
+const ASM_IFNULL_OPCODE_DELTA = 20
+
+// ASM specific opcodes, used for long forward jump instructions.
+const ASM_IFEQ = IFEQ + ASM_OPCODE_DELTA
+const ASM_IFNE = IFNE + ASM_OPCODE_DELTA
+const ASM_IFLT = IFLT + ASM_OPCODE_DELTA
+const ASM_IFGE = IFGE + ASM_OPCODE_DELTA
+const ASM_IFGT = IFGT + ASM_OPCODE_DELTA
+const ASM_IFLE = IFLE + ASM_OPCODE_DELTA
+const ASM_IF_ICMPEQ = IF_ICMPEQ + ASM_OPCODE_DELTA
+const ASM_IF_ICMPNE = IF_ICMPNE + ASM_OPCODE_DELTA
+const ASM_IF_ICMPLT = IF_ICMPLT + ASM_OPCODE_DELTA
+const ASM_IF_ICMPGE = IF_ICMPGE + ASM_OPCODE_DELTA
+const ASM_IF_ICMPGT = IF_ICMPGT + ASM_OPCODE_DELTA
+const ASM_IF_ICMPLE = IF_ICMPLE + ASM_OPCODE_DELTA
+const ASM_IF_ACMPEQ = IF_ACMPEQ + ASM_OPCODE_DELTA
+const ASM_IF_ACMPNE = IF_ACMPNE + ASM_OPCODE_DELTA
+const ASM_GOTO = GOTO + ASM_OPCODE_DELTA
+const ASM_JSR = JSR + ASM_OPCODE_DELTA
+const ASM_IFNULL = IFNULL + ASM_IFNULL_OPCODE_DELTA
+const ASM_IFNONNULL = IFNONNULL + ASM_IFNULL_OPCODE_DELTA
+const ASM_GOTO_W = 220

asm/context.go

@@ -9,11 +9,11 @@ type Context struct {
 	currentMethodAccessFlags                   int
 	currentMethodName                          string
 	currentMethodDescriptor                    string
-	currentMethodLabels                        []interface{} //[]Label
+	currentMethodLabels                        []*Label
 	currentTypeAnnotationTarget                int
-	currentTypeAnnotationTargetPath            interface{}   //TypePath
-	currentLocalVariableAnnotationRangeStarts  []interface{} //[]Label
-	currentLocalVariableAnnotationRangeEnds    []interface{} //[]Label
+	currentTypeAnnotationTargetPath            interface{} //TypePath
+	currentLocalVariableAnnotationRangeStarts  []*Label
+	currentLocalVariableAnnotationRangeEnds    []*Label
 	currentLocalVariableAnnotationRangeIndices []int
 	currentFrameOffset                         int
 	currentFrameType                           int

asm/opcodes/opcodes.go

@@ -1,5 +1,21 @@
 package opcodes
 
+// ASM API versions.
+const ASM4 = 4<<16 | 0<<8 | 0
+const ASM5 = 5<<16 | 0<<8 | 0
+const ASM6 = 6<<16 | 0<<8 | 0
+
+// Java ClassFile versions (the minor version is stored in the 16 most significant bits, and the
+// major version is 16 least significant bits).
+const V1_1 = 3<<16 | 45
+const V1_2 = 0<<16 | 46
+const V1_3 = 0<<16 | 47
+const V1_4 = 0<<16 | 48
+const V1_5 = 0<<16 | 49
+const V1_6 = 0<<16 | 50
+const V1_7 = 0<<16 | 51
+const V1_8 = 0<<16 | 52
+const V9 = 0<<16 | 53
 const V10 = 0<<16 | 54
 
 const ACC_PUBLIC = 0x0001       // class, field, method
@@ -26,3 +42,214 @@ const ACC_ENUM = 0x4000         // class(?) field inner
 const ACC_MANDATED = 0x8000     // parameter, module, module *
 const ACC_MODULE = 0x8000       // class
 const ACC_DEPRECATED = 0x20000  // class, field, method
+
+const T_BOOLEAN = 4
+const T_CHAR = 5
+const T_FLOAT = 6
+const T_DOUBLE = 7
+const T_BYTE = 8
+const T_SHORT = 9
+const T_INT = 10
+const T_LONG = 11
+
+// Possible values for the reference_kind field of CONSTANT_MethodHandle_info structures.
+// See https://docs.oracle.com/javase/specs/jvms/se9/html/jvms-4.html#jvms-4.4.8.
+
+const H_GETFIELD = 1
+const H_GETSTATIC = 2
+const H_PUTFIELD = 3
+const H_PUTSTATIC = 4
+const H_INVOKEVIRTUAL = 5
+const H_INVOKESTATIC = 6
+const H_INVOKESPECIAL = 7
+const H_NEWINVOKESPECIAL = 8
+const H_INVOKEINTERFACE = 9
+
+// ASM specific stack map frame types, used in {@link ClassVisitor#visitFrame}.
+
+/** An expanded frame. See {@link ClassReader#EXPAND_FRAMES}. */
+const F_NEW = -1
+
+/** A compressed frame with complete frame data. */
+const F_FULL = 0
+
+/**
+ * A compressed frame where locals are the same as the locals in the previous frame, except that
+ * additional 1-3 locals are defined, and with an empty stack.
+ */
+const F_APPEND = 1
+
+/**
+ * A compressed frame where locals are the same as the locals in the previous frame, except that
+ * the last 1-3 locals are absent and with an empty stack.
+ */
+const F_CHOP = 2
+
+/**
+ * A compressed frame with exactly the same locals as the previous frame and with an empty stack.
+ */
+const F_SAME = 3
+
+/**
+* A compressed frame with exactly the same locals as the previous frame and with a single value
+* on the stack.
+ */
+const F_SAME1 = 4
+
+const NOP = 0               // visitInsn
+const ACONST_NULL = 1       // -
+const ICONST_M1 = 2         // -
+const ICONST_0 = 3          // -
+const ICONST_1 = 4          // -
+const ICONST_2 = 5          // -
+const ICONST_3 = 6          // -
+const ICONST_4 = 7          // -
+const ICONST_5 = 8          // -
+const LCONST_0 = 9          // -
+const LCONST_1 = 10         // -
+const FCONST_0 = 11         // -
+const FCONST_1 = 12         // -
+const FCONST_2 = 13         // -
+const DCONST_0 = 14         // -
+const DCONST_1 = 15         // -
+const BIPUSH = 16           // visitIntInsn
+const SIPUSH = 17           // -
+const LDC = 18              // visitLdcInsn
+const ILOAD = 21            // visitVarInsn
+const LLOAD = 22            // -
+const FLOAD = 23            // -
+const DLOAD = 24            // -
+const ALOAD = 25            // -
+const IALOAD = 46           // visitInsn
+const LALOAD = 47           // -
+const FALOAD = 48           // -
+const DALOAD = 49           // -
+const AALOAD = 50           // -
+const BALOAD = 51           // -
+const CALOAD = 52           // -
+const SALOAD = 53           // -
+const ISTORE = 54           // visitVarInsn
+const LSTORE = 55           // -
+const FSTORE = 56           // -
+const DSTORE = 57           // -
+const ASTORE = 58           // -
+const IASTORE = 79          // visitInsn
+const LASTORE = 80          // -
+const FASTORE = 81          // -
+const DASTORE = 82          // -
+const AASTORE = 83          // -
+const BASTORE = 84          // -
+const CASTORE = 85          // -
+const SASTORE = 86          // -
+const POP = 87              // -
+const POP2 = 88             // -
+const DUP = 89              // -
+const DUP_X1 = 90           // -
+const DUP_X2 = 91           // -
+const DUP2 = 92             // -
+const DUP2_X1 = 93          // -
+const DUP2_X2 = 94          // -
+const SWAP = 95             // -
+const IADD = 96             // -
+const LADD = 97             // -
+const FADD = 98             // -
+const DADD = 99             // -
+const ISUB = 100            // -
+const LSUB = 101            // -
+const FSUB = 102            // -
+const DSUB = 103            // -
+const IMUL = 104            // -
+const LMUL = 105            // -
+const FMUL = 106            // -
+const DMUL = 107            // -
+const IDIV = 108            // -
+const LDIV = 109            // -
+const FDIV = 110            // -
+const DDIV = 111            // -
+const IREM = 112            // -
+const LREM = 113            // -
+const FREM = 114            // -
+const DREM = 115            // -
+const INEG = 116            // -
+const LNEG = 117            // -
+const FNEG = 118            // -
+const DNEG = 119            // -
+const ISHL = 120            // -
+const LSHL = 121            // -
+const ISHR = 122            // -
+const LSHR = 123            // -
+const IUSHR = 124           // -
+const LUSHR = 125           // -
+const IAND = 126            // -
+const LAND = 127            // -
+const IOR = 128             // -
+const LOR = 129             // -
+const IXOR = 130            // -
+const LXOR = 131            // -
+const IINC = 132            // visitIincInsn
+const I2L = 133             // visitInsn
+const I2F = 134             // -
+const I2D = 135             // -
+const L2I = 136             // -
+const L2F = 137             // -
+const L2D = 138             // -
+const F2I = 139             // -
+const F2L = 140             // -
+const F2D = 141             // -
+const D2I = 142             // -
+const D2L = 143             // -
+const D2F = 144             // -
+const I2B = 145             // -
+const I2C = 146             // -
+const I2S = 147             // -
+const LCMP = 148            // -
+const FCMPL = 149           // -
+const FCMPG = 150           // -
+const DCMPL = 151           // -
+const DCMPG = 152           // -
+const IFEQ = 153            // visitJumpInsn
+const IFNE = 154            // -
+const IFLT = 155            // -
+const IFGE = 156            // -
+const IFGT = 157            // -
+const IFLE = 158            // -
+const IF_ICMPEQ = 159       // -
+const IF_ICMPNE = 160       // -
+const IF_ICMPLT = 161       // -
+const IF_ICMPGE = 162       // -
+const IF_ICMPGT = 163       // -
+const IF_ICMPLE = 164       // -
+const IF_ACMPEQ = 165       // -
+const IF_ACMPNE = 166       // -
+const GOTO = 167            // -
+const JSR = 168             // -
+const RET = 169             // visitVarInsn
+const TABLESWITCH = 170     // visiTableSwitchInsn
+const LOOKUPSWITCH = 171    // visitLookupSwitch
+const IRETURN = 172         // visitInsn
+const LRETURN = 173         // -
+const FRETURN = 174         // -
+const DRETURN = 175         // -
+const ARETURN = 176         // -
+const RETURN = 177          // -
+const GETSTATIC = 178       // visitFieldInsn
+const PUTSTATIC = 179       // -
+const GETFIELD = 180        // -
+const PUTFIELD = 181        // -
+const INVOKEVIRTUAL = 182   // visitMethodInsn
+const INVOKESPECIAL = 183   // -
+const INVOKESTATIC = 184    // -
+const INVOKEINTERFACE = 185 // -
+const INVOKEDYNAMIC = 186   // visitInvokeDynamicInsn
+const NEW = 187             // visitTypeInsn
+const NEWARRAY = 188        // visitIntInsn
+const ANEWARRAY = 189       // visitTypeInsn
+const ARRAYLENGTH = 190     // visitInsn
+const ATHROW = 191          // -
+const CHECKCAST = 192       // visitTypeInsn
+const INSTANCEOF = 193      // -
+const MONITORENTER = 194    // visitInsn
+const MONITOREXIT = 195     // -
+const MULTIANEWARRAY = 197  // visitMultiANewArrayInsn
+const IFNULL = 198          // visitJumpInsn
+const IFNONNULL = 199       // -