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resolves attributes now

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nora 2021-08-19 23:37:48 +02:00
parent 750508714a
commit 55c1107be5
3 changed files with 211 additions and 30 deletions
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194
src/parse/mod.rs
View file

@ -16,11 +16,15 @@ struct Data<'a> {
}
pub fn parse_class_file(data: &[u1]) -> Result<ClassFile> {
let mut data = Data { data, pointer: 0 };
let mut data = Data::new(data);
ClassFile::parse(&mut data)
}
impl<'a> Data<'a> {
fn new(data: &'a [u1]) -> Self {
Data { data, pointer: 0 }
}
fn u1(&mut self) -> Result<u1> {
let item = self.data.get(self.pointer).cloned();
self.pointer += 1;
@ -116,7 +120,7 @@ impl Parse for ClassFile {
let attributes_count = data.u2()?;
let attributes = parse_vec(data, attributes_count)?;
Ok(Self {
let mut class = Self {
magic,
minor_version,
major_version,
@ -133,7 +137,9 @@ impl Parse for ClassFile {
methods,
attributes_count,
attributes,
})
};
resolve_attributes(&mut class)?;
Ok(class)
}
}
@ -191,7 +197,8 @@ impl Parse for CpInfo {
1 => Self::Utf8 {
tag,
length: data.u2()?,
bytes: parse_vec(data, data.last_u2()?)?,
bytes: String::from_utf8(parse_vec(data, data.last_u2()?)?)
.map_err(|err| ParseErr(format!("Invalid utf8 in CpInfo::Utf8: {}", err)))?,
},
15 => Self::MethodHandle {
tag,
@ -236,9 +243,9 @@ impl Parse for MethodInfo {
}
}
impl Parse for Attribute {
impl Parse for AttributeInfo {
fn parse(data: &mut Data) -> Result<Self> {
Ok(Self {
Ok(Self::Unknown {
attribute_name_index: data.u2()?,
attribute_length: data.u4()?,
attribute_content: parse_vec(data, data.last_u4()? as usize)?,
@ -433,3 +440,178 @@ impl Parse for BootstrapMethod {
})
}
}
fn resolve_attributes(class: &mut ClassFile) -> Result<()> {
let pool = &class.constant_pool;
class
.attributes
.iter_mut()
.map(|attr| AttributeInfo::resolve_attribute(attr, pool))
.collect::<Result<Vec<()>>>()?;
Ok(())
}
impl AttributeInfo {
fn resolve_attribute(&mut self, pool: &[CpInfo]) -> Result<()> {
// this is a borrow checker hack, but it works :(
let attr = std::mem::replace(self, AttributeInfo::__Empty);
let (&index, &len, content) = match &attr {
AttributeInfo::Unknown {
attribute_name_index,
attribute_length,
attribute_content,
} => (attribute_name_index, attribute_length, attribute_content),
_ => unreachable!("Attribute already resolved"),
};
let info = match pool.get(index as usize - 1) {
Some(CpInfo::Utf8 { bytes, .. }) => bytes,
Some(_) => return Err(ParseErr("Attribute name is not CpInfo::Utf8".to_string())),
_ => return Err(ParseErr("Constant Pool index out of Bounds".to_string())),
};
let mut data = Data::new(&content);
self.resolve_attribute_inner(index, len, info, &mut data)
}
fn resolve_attribute_inner(
&mut self,
attribute_name_index: u16,
attribute_length: u32,
name: &str,
data: &mut Data,
) -> Result<()> {
let _ = std::mem::replace(
self,
match name {
"ConstantValue" => Self::ConstantValue {
attribute_name_index,
attribute_length,
constantvalue_index: data.u2()?,
},
"Code" => Self::Code {
attribute_name_index,
attribute_length,
max_stack: data.u2()?,
max_locals: data.u2()?,
code_length: data.u4()?,
code: parse_vec(data, data.last_u4()? as usize)?,
exception_table_length: data.u2()?,
exception_table: parse_vec(data, data.last_u2()?)?,
attributes_count: data.u2()?,
attributes: parse_vec(data, data.last_u2()?)?,
},
"StackMapTable" => Self::StackMapTable {
attribute_name_index,
attribute_length,
number_of_entries: data.u2()?,
entries: parse_vec(data, data.last_u2()?)?,
},
"Exceptions" => Self::Exceptions {
attribute_name_index,
attribute_length,
number_of_exceptions: data.u2()?,
exception_index_table: parse_vec(data, data.last_u2()?)?,
},
"InnerClasses" => Self::InnerClasses {
attribute_name_index,
attribute_length,
number_of_classes: data.u2()?,
classes: parse_vec(data, data.last_u2()?)?,
},
"EnclosingMethod" => Self::EnclosingMethod {
attribute_name_index,
attribute_length,
class_index: data.u2()?,
method_index: data.u2()?,
},
"Synthetic" => Self::Synthetic {
attribute_name_index,
attribute_length,
},
"Signature" => Self::Signature {
attribute_name_index,
attribute_length,
signature_index: data.u2()?,
},
"SourceFile" => Self::SourceFile {
attribute_name_index,
attribute_length,
sourcefile_index: data.u2()?,
},
"SourceDebugExtension" => Self::SourceDebugExtension {
attribute_name_index,
attribute_length,
debug_extension: parse_vec(data, data.last_u2()?)?,
},
"LineNumberTable" => Self::LineNumberTable {
attribute_name_index,
attribute_length,
line_number_table_length: data.u2()?,
line_number_table: parse_vec(data, data.last_u2()?)?,
},
"LocalVariableTable" => Self::LocalVariableTable {
attribute_name_index,
attribute_length,
local_variable_table_length: data.u2()?,
local_variable_table: parse_vec(data, data.last_u2()?)?,
},
"LocalVariableTypeTable" => Self::LocalVariableTypeTable {
attribute_name_index,
attribute_length,
local_variable_table_length: data.u2()?,
local_variable_table: parse_vec(data, data.last_u2()?)?,
},
"Deprecated" => Self::Deprecated {
attribute_name_index,
attribute_length,
},
"RuntimeVisibleAnnotations" => Self::RuntimeVisibleAnnotations {
attribute_name_index,
attribute_length,
num_annotations: data.u2()?,
annotations: parse_vec(data, data.last_u2()?)?,
},
"RuntimeInvisibleAnnotations" => Self::RuntimeInvisibleAnnotations {
attribute_name_index,
attribute_length,
num_annotations: data.u2()?,
annotations: parse_vec(data, data.last_u2()?)?,
},
"RuntimeVisibleParameterAnnotations" => Self::RuntimeVisibleParameterAnnotations {
attribute_name_index,
attribute_length,
num_parameters: data.u1()?,
parameter_annotations: parse_vec(data, data.last_u1()?)?,
},
"RuntimeInvisibleParameterAnnotations" => {
Self::RuntimeInvisibleParameterAnnotations {
attribute_name_index,
attribute_length,
num_parameters: data.u1()?,
parameter_annotations: parse_vec(data, data.last_u1()?)?,
}
}
"AnnotationDefault" => Self::AnnotationDefault {
attribute_name_index,
attribute_length,
default_value: AnnotationElementValue {
tag: data.u1()?,
value: AnnotationElementValueValue::parse(data)?,
},
},
"BootstrapMethods" => Self::BootstrapMethods {
attribute_name_index,
attribute_length,
num_bootstrap_methods: data.u2()?,
bootstrap_methods: parse_vec(data, data.last_u2()?)?,
},
name => return Err(ParseErr(format!("Invalid Attribute name: {}", name))),
},
);
Ok(())
}
}

27
src/parse/model.rs
View file

@ -48,7 +48,7 @@ pub struct ClassFile {
/// The number of attributes in `attributes`
pub attributes_count: u2,
/// All attributes of the class
pub attributes: Vec<Attribute>,
pub attributes: Vec<AttributeInfo>,
}
/// A constant from the constant pool
@ -126,7 +126,7 @@ pub enum CpInfo {
/// The length of the String. Not null-terminated.
length: u2,
/// Contains modified UTF-8
bytes: Vec<u1>,
bytes: String,
},
MethodHandle {
tag: u1, // 15
@ -157,7 +157,7 @@ pub struct FieldInfo {
pub name_index: u2,
pub descriptor_index: u2,
pub attributes_count: u2,
pub attributes: Vec<Attribute>,
pub attributes: Vec<AttributeInfo>,
}
/// Information about a method
@ -172,15 +172,7 @@ pub struct MethodInfo {
/// The amount of attributes for this method
pub attributes_count: u2,
/// The attributes for this method
pub attributes: Vec<Attribute>,
}
/// See `AttributeInfo`
#[derive(Debug, Clone, Hash, PartialEq, Eq)]
pub struct Attribute {
pub attribute_name_index: u2,
pub attribute_length: u4,
pub attribute_content: Vec<u1>,
pub attributes: Vec<AttributeInfo>,
}
/// Information about an attribute
@ -190,8 +182,15 @@ pub struct Attribute {
///
/// _index: Index to the `constant_pool` table of any type
#[derive(Debug, Clone, Hash, PartialEq, Eq)]
#[allow(dead_code)] // todo yeah lol
// todo refactor this into a struct + enum
pub enum AttributeInfo {
__Empty,
/// The exact kind of attribute is not known yet and will be resolved later in the process
Unknown {
attribute_name_index: u2,
attribute_length: u4,
attribute_content: Vec<u1>,
},
/// Only on fields, the constant value of that field
ConstantValue {
attribute_name_index: u2, // "ConstantValue"
@ -217,7 +216,7 @@ pub enum AttributeInfo {
exception_table: Vec<AttributeCodeException>,
attributes_count: u2,
/// The attributes of the code
attributes: Vec<Attribute>,
attributes: Vec<AttributeInfo>,
},
/// Only on the `Code` attribute, used for verification
/// May be implicit on version >= 50.0, with no entries

20
src/parse/test.rs
View file

@ -64,17 +64,17 @@ fn parse_empty_class() {
CpInfo::Utf8 {
tag: 1,
length: 0x10,
bytes: "java/lang/Object".bytes().collect()
bytes: "java/lang/Object".to_string()
},
CpInfo::Utf8 {
tag: 1,
length: 6,
bytes: "<init>".bytes().collect()
bytes: "<init>".to_string()
},
CpInfo::Utf8 {
tag: 1,
length: 3,
bytes: "()V".bytes().collect()
bytes: "()V".to_string()
},
CpInfo::Class {
tag: 7,
@ -83,27 +83,27 @@ fn parse_empty_class() {
CpInfo::Utf8 {
tag: 1,
length: 4,
bytes: "Test".bytes().collect()
bytes: "Test".to_string()
},
CpInfo::Utf8 {
tag: 1,
length: 4,
bytes: "Code".bytes().collect()
bytes: "Code".to_string()
},
CpInfo::Utf8 {
tag: 1,
length: 15,
bytes: "LineNumberTable".bytes().collect()
bytes: "LineNumberTable".to_string()
},
CpInfo::Utf8 {
tag: 1,
length: 10,
bytes: "SourceFile".bytes().collect()
bytes: "SourceFile".to_string()
},
CpInfo::Utf8 {
tag: 1,
length: 9,
bytes: "Test.java".bytes().collect()
bytes: "Test.java".to_string()
}
]
);
@ -119,8 +119,8 @@ fn parse_empty_class() {
assert_eq!(parsed.methods[0].name_index, 5);
assert_eq!(parsed.methods[0].descriptor_index, 6);
assert_eq!(parsed.methods[0].attributes_count, 1);
assert_eq!(parsed.methods[0].attributes[0].attribute_name_index, 9);
assert_eq!(parsed.methods[0].attributes[0].attribute_length, 0x1d);
//assert_eq!(parsed.methods[0].attributes[0].attribute_name_index, 9);
//assert_eq!(parsed.methods[0].attributes[0].attribute_length, 0x1d);
}
#[test]