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feature/instructions #1

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katkak merged 6 commits from feature/instructions into master 2026-09-07 20:36:37 +02:00
Conversation 0 Commits 6 Files changed 5 +79 -102
1 changed files with 79 additions and 102 deletions
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181
src/Class/Code/Instruction.zig
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@ -1,6 +1,7 @@
const std = @import("std");
const Class = @import("../../Class.zig");
const ConstantPool = Class.ConstantPool;
const ParseError = Class.ParseError;
const Op = enum(u8) {
@ -208,47 +209,29 @@ const Op = enum(u8) {
wide = 0xc4,
};
const IndexU8 = struct {
index: u8,
const Self = @This();
pub fn parse(input: *std.Io.Reader, byte_index: *usize) ParseError!Self {
defer byte_index.* += 1;
return .{
.index = try input.takeByte(),
};
fn Index(comptime T: type) type {
const bits = @typeInfo(T).int.bits;
if (bits % 8 != 0) {
@compileError("Bits should be multiple of 8");
}
};
const bytes = bits / 8;
const IndexU16 = struct {
index: u16,
return struct {
index: T,
const Self = @This();
const Self = @This();
pub fn parse(input: *std.Io.Reader, byte_index: *usize) ParseError!Self {
defer byte_index.* += 2;
pub fn parse(input: *std.Io.Reader, byte_index: *usize) ParseError!Self {
defer byte_index.* += bytes;
return .{
.index = try input.takeInt(u16, .big),
};
}
};
const index = try if (bytes == 1) input.takeByte() else input.takeInt(T, .big);
const IndexU32 = struct {
index: u32,
const Self = @This();
pub fn parse(input: *std.Io.Reader, byte_index: *usize) ParseError!Self {
defer byte_index.* += 4;
return .{
.index = try input.takeInt(u32, .big),
};
}
};
return .{
.index = index,
};
}
};
}
const Byte = struct {
byte: u8,
@ -264,33 +247,27 @@ const Byte = struct {
}
};
const BranchU16 = struct {
branch: u16,
const Self = @This();
pub fn parse(input: *std.Io.Reader, byte_index: *usize) ParseError!Self {
defer byte_index.* += 2;
return .{
.branch = try input.takeInt(u16, .big),
};
fn Branch(comptime T: type) type {
const bits = @typeInfo(T).int.bits;
if (bits % 8 != 0) {
@compileError("Bits should be multiple of 8");
}
};
const bytes = bits / 8;
const BranchU32 = struct {
branch: u32,
return struct {
branch: T,
const Self = @This();
const Self = @This();
pub fn parse(input: *std.Io.Reader, byte_index: *usize) ParseError!Self {
defer byte_index.* += 4;
pub fn parse(input: *std.Io.Reader, byte_index: *usize) ParseError!Self {
defer byte_index.* += bytes;
return .{
.branch = try input.takeInt(u32, .big),
};
}
};
return .{
.branch = try input.takeInt(u16, .big),
};
}
};
}
const IInc = struct {
index: u8,
@ -537,15 +514,15 @@ pub const Instruction = union(Op) {
aaload,
aastore,
aconst_null,
aload: IndexU8,
aload: Index(u8),
aload_0,
aload_1,
aload_2,
aload_3,
anewarray: IndexU16,
anewarray: Index(u16),
areturn,
arraylength,
astore: IndexU8,
astore: Index(u8),
astore_0,
astore_1,
astore_2,
@ -556,7 +533,7 @@ pub const Instruction = union(Op) {
bipush: Byte,
caload,
castore,
checkcast: IndexU16,
checkcast: Index(u16),
d2f,
d2i,
d2l,
@ -568,7 +545,7 @@ pub const Instruction = union(Op) {
dconst_0,
dconst_1,
ddiv,
dload: IndexU8,
dload: Index(u8),
dload_0,
dload_1,
dload_2,
@ -577,7 +554,7 @@ pub const Instruction = union(Op) {
dneg,
drem,
dreturn,
dstore: IndexU8,
dstore: Index(u8),
dstore_0,
dstore_1,
dstore_2,
@ -601,7 +578,7 @@ pub const Instruction = union(Op) {
fconst_1,
fconst_2,
fdiv,
fload: IndexU8,
fload: Index(u8),
fload_0,
fload_1,
fload_2,
@ -610,16 +587,16 @@ pub const Instruction = union(Op) {
fneg,
frem,
freturn,
fstore: IndexU8,
fstore: Index(u8),
fstore_0,
fstore_1,
fstore_2,
fstore_3,
fsub,
getfield: IndexU16,
getstatic: IndexU16,
goto: IndexU16,
goto_w: IndexU32,
getfield: Index(u16),
getstatic: Index(u16),
goto: Index(u16),
goto_w: Index(u32),
i2b,
i2c,
i2d,
@ -638,42 +615,42 @@ pub const Instruction = union(Op) {
iconst_4,
iconst_5,
idiv,
if_acmpeq: BranchU16,
if_acmpne: BranchU16,
if_icmpeq: BranchU16,
if_icmpne: BranchU16,
if_icmplt: BranchU16,
if_icmpge: BranchU16,
if_icmpgt: BranchU16,
if_icmple: BranchU16,
ifeq: BranchU16,
ifne: BranchU16,
iflt: BranchU16,
ifge: BranchU16,
ifgt: BranchU16,
ifle: BranchU16,
ifnonnull: BranchU16,
ifnull: BranchU16,
if_acmpeq: Branch(u16),
if_acmpne: Branch(u16),
if_icmpeq: Branch(u16),
if_icmpne: Branch(u16),
if_icmplt: Branch(u16),
if_icmpge: Branch(u16),
if_icmpgt: Branch(u16),
if_icmple: Branch(u16),
ifeq: Branch(u16),
ifne: Branch(u16),
iflt: Branch(u16),
ifge: Branch(u16),
ifgt: Branch(u16),
ifle: Branch(u16),
ifnonnull: Branch(u16),
ifnull: Branch(u16),
iinc: IInc,
iload: IndexU8,
iload: Index(u8),
iload_0,
iload_1,
iload_2,
iload_3,
imul,
ineg,
instanceof: IndexU16,
instanceof: Index(u16),
invokedynamic: InvokeDynamic,
invokeinterface: InvokeInterface,
invokespecial: IndexU16,
invokestatic: IndexU16,
invokevirtual: IndexU16,
invokespecial: Index(u16),
invokestatic: Index(u16),
invokevirtual: Index(u16),
ior,
irem,
ireturn,
ishl,
ishr,
istore: IndexU8,
istore: Index(u8),
istore_0,
istore_1,
istore_2,
@ -681,8 +658,8 @@ pub const Instruction = union(Op) {
isub,
iushr,
ixor,
jsr: BranchU16,
jsr_w: BranchU32,
jsr: Branch(u16),
jsr_w: Branch(u32),
l2d,
l2f,
l2i,
@ -693,11 +670,11 @@ pub const Instruction = union(Op) {
lcmp,
lconst_0,
lconst_1,
ldc: IndexU8,
ldc_w: IndexU16,
ldc2_w: IndexU16,
ldc: Index(u8),
ldc_w: Index(u16),
ldc2_w: Index(u16),
ldiv,
lload: IndexU8,
lload: Index(u8),
lload_0,
lload_1,
lload_2,
@ -710,7 +687,7 @@ pub const Instruction = union(Op) {
lreturn,
lshl,
lshr,
lstore: IndexU8,
lstore: Index(u8),
lstore_0,
lstore_1,
lstore_2,
@ -721,14 +698,14 @@ pub const Instruction = union(Op) {
monitorenter,
monitorexit,
multianewarray: MultiANewArray,
new: IndexU16,
new: Index(u16),
newarray: NewArray,
nop,
pop,
pop2,
putfield: IndexU16,
putstatic: IndexU16,
ret: IndexU8,
putfield: Index(u16),
putstatic: Index(u16),
ret: Index(u8),
@"return",
saload,
sastore,