use alloc::{boxed::Box, format, string::ToString, vec::Vec};
use log::info;
use tinywasm_types::{BlockArgs, Export, ExternalKind, FuncType, Instruction, MemArg, ValType};
use wasmparser::{FuncValidator, ValidatorResources};
use crate::{module::CodeSection, Result};
pub(crate) fn convert_module_export(export: wasmparser::Export) -> Result<Export> {
let kind = match export.kind {
wasmparser::ExternalKind::Func => ExternalKind::Func,
wasmparser::ExternalKind::Table => ExternalKind::Table,
wasmparser::ExternalKind::Memory => ExternalKind::Memory,
wasmparser::ExternalKind::Global => ExternalKind::Global,
wasmparser::ExternalKind::Tag => {
return Err(crate::ParseError::UnsupportedOperator(format!(
"Unsupported export kind: {:?}",
export.kind
)))
}
};
Ok(Export {
index: export.index,
name: Box::from(export.name),
kind,
})
}
pub(crate) fn convert_module_code(
func: wasmparser::FunctionBody,
mut validator: FuncValidator<ValidatorResources>,
) -> Result<CodeSection> {
let locals_reader = func.get_locals_reader()?;
let count = locals_reader.get_count();
let pos = locals_reader.original_position();
let mut locals = Vec::with_capacity(count as usize);
for (i, local) in locals_reader.into_iter().enumerate() {
let local = local?;
validator.define_locals(pos + i, local.0, local.1)?;
for _ in 0..local.0 {
locals.push(convert_valtype(&local.1));
}
}
let body_reader = func.get_operators_reader()?;
let body = process_operators(body_reader.original_position(), body_reader.into_iter(), validator)?;
Ok(CodeSection {
locals: locals.into_boxed_slice(),
body,
})
}
pub(crate) fn convert_module_type(ty: wasmparser::Type) -> Result<FuncType> {
let wasmparser::Type::Func(ty) = ty;
let params = ty
.params()
.iter()
.map(|p| Ok(convert_valtype(p)))
.collect::<Result<Vec<ValType>>>()?
.into_boxed_slice();
let results = ty
.results()
.iter()
.map(|p| Ok(convert_valtype(p)))
.collect::<Result<Vec<ValType>>>()?
.into_boxed_slice();
Ok(FuncType { params, results })
}
pub(crate) fn convert_blocktype(blocktype: wasmparser::BlockType) -> BlockArgs {
use wasmparser::BlockType::*;
match blocktype {
Empty => BlockArgs::Empty,
// We should maybe have all this in a single variant for our custom bytecode
// TODO: maybe solve this differently so we can support 128-bit values
// without having to increase the size of the WasmValue enum
Type(ty) => BlockArgs::Type(convert_valtype(&ty)),
FuncType(ty) => BlockArgs::FuncType(ty),
}
}
pub(crate) fn convert_valtype(valtype: &wasmparser::ValType) -> ValType {
use wasmparser::ValType::*;
match valtype {
I32 => ValType::I32,
I64 => ValType::I64,
F32 => ValType::F32,
F64 => ValType::F64,
V128 => ValType::V128,
FuncRef => ValType::FuncRef,
ExternRef => ValType::ExternRef,
}
}
pub(crate) fn convert_memarg(memarg: wasmparser::MemArg) -> MemArg {
MemArg {
offset: memarg.offset,
align: memarg.align,
}
}
pub fn process_operators<'a>(
mut offset: usize,
ops: impl Iterator<Item = Result<wasmparser::Operator<'a>, wasmparser::BinaryReaderError>>,
mut validator: FuncValidator<ValidatorResources>,
) -> Result<Box<[Instruction]>> {
let mut instructions = Vec::new();
let mut labels_ptrs = Vec::new(); // indexes into the instructions array
for op in ops {
info!("op: {:?}", op);
let op = op?;
validator.op(offset, &op)?;
offset += 1;
use wasmparser::Operator::*;
let res = match op {
BrTable { targets } => {
let def = targets.default();
let targets = targets
.targets()
.collect::<Result<Vec<u32>, wasmparser::BinaryReaderError>>()?;
instructions.push(Instruction::BrTable(def, targets.len()));
instructions.extend(targets.into_iter().map(Instruction::BrLabel));
continue;
}
Unreachable => Instruction::Unreachable,
Nop => Instruction::Nop,
Block { blockty } => {
labels_ptrs.push(instructions.len());
Instruction::Block(convert_blocktype(blockty), 0)
}
Loop { blockty } => {
labels_ptrs.push(instructions.len());
Instruction::Loop(convert_blocktype(blockty), 0)
}
If { blockty } => {
labels_ptrs.push(instructions.len());
Instruction::If(convert_blocktype(blockty), None, 0)
}
Else => {
labels_ptrs.push(instructions.len());
Instruction::Else(0)
}
End => {
if let Some(label_pointer) = labels_ptrs.pop() {
info!("ending block: {:?}", instructions[label_pointer]);
let current_instr_ptr = instructions.len();
// last_label_pointer is Some if we're ending a block
match instructions[label_pointer] {
Instruction::Else(ref mut else_instr_end_offset) => {
*else_instr_end_offset = current_instr_ptr - label_pointer;
// since we're ending an else block, we need to end the if block as well
let if_label_pointer = labels_ptrs.pop().ok_or(crate::ParseError::UnsupportedOperator(
"Expected to end an if block, but the last label was not an if".to_string(),
))?;
let if_instruction = &mut instructions[if_label_pointer];
let Instruction::If(_, ref mut else_offset, ref mut end_offset) = if_instruction else {
return Err(crate::ParseError::UnsupportedOperator(
"Expected to end an if block, but the last label was not an if".to_string(),
));
};
*else_offset = Some(label_pointer - if_label_pointer);
*end_offset = current_instr_ptr - if_label_pointer;
}
Instruction::Block(_, ref mut end_offset)
| Instruction::Loop(_, ref mut end_offset)
| Instruction::If(_, _, ref mut end_offset) => {
*end_offset = current_instr_ptr - label_pointer;
}
_ => {
return Err(crate::ParseError::UnsupportedOperator(
"Expected to end a block, but the last label was not a block".to_string(),
))
}
}
Instruction::EndBlockFrame
} else {
// last_label_pointer is None if we're ending the function
Instruction::EndFunc
}
}
Br { relative_depth } => Instruction::Br(relative_depth),
BrIf { relative_depth } => Instruction::BrIf(relative_depth),
Return => Instruction::Return,
Call { function_index } => Instruction::Call(function_index),
CallIndirect {
type_index,
table_index,
..
} => Instruction::CallIndirect(type_index, table_index),
Drop => Instruction::Drop,
Select => Instruction::Select,
LocalGet { local_index } => Instruction::LocalGet(local_index),
LocalSet { local_index } => Instruction::LocalSet(local_index),
LocalTee { local_index } => Instruction::LocalTee(local_index),
GlobalGet { global_index } => Instruction::GlobalGet(global_index),
GlobalSet { global_index } => Instruction::GlobalSet(global_index),
MemorySize { .. } => Instruction::MemorySize,
MemoryGrow { .. } => Instruction::MemoryGrow,
I32Const { value } => Instruction::I32Const(value),
I64Const { value } => Instruction::I64Const(value),
F32Const { value } => Instruction::F32Const(f32::from_bits(value.bits())), // TODO: check if this is correct
F64Const { value } => Instruction::F64Const(f64::from_bits(value.bits())), // TODO: check if this is correct
I32Load { memarg } => Instruction::I32Load(convert_memarg(memarg)),
I64Load { memarg } => Instruction::I64Load(convert_memarg(memarg)),
F32Load { memarg } => Instruction::F32Load(convert_memarg(memarg)),
F64Load { memarg } => Instruction::F64Load(convert_memarg(memarg)),
I32Load8S { memarg } => Instruction::I32Load8S(convert_memarg(memarg)),
I32Load8U { memarg } => Instruction::I32Load8U(convert_memarg(memarg)),
I32Load16S { memarg } => Instruction::I32Load16S(convert_memarg(memarg)),
I32Load16U { memarg } => Instruction::I32Load16U(convert_memarg(memarg)),
I64Load8S { memarg } => Instruction::I64Load8S(convert_memarg(memarg)),
I64Load8U { memarg } => Instruction::I64Load8U(convert_memarg(memarg)),
I64Load16S { memarg } => Instruction::I64Load16S(convert_memarg(memarg)),
I64Load16U { memarg } => Instruction::I64Load16U(convert_memarg(memarg)),
I64Load32S { memarg } => Instruction::I64Load32S(convert_memarg(memarg)),
I64Load32U { memarg } => Instruction::I64Load32U(convert_memarg(memarg)),
I32Store { memarg } => Instruction::I32Store(convert_memarg(memarg)),
I64Store { memarg } => Instruction::I64Store(convert_memarg(memarg)),
F32Store { memarg } => Instruction::F32Store(convert_memarg(memarg)),
F64Store { memarg } => Instruction::F64Store(convert_memarg(memarg)),
I32Store8 { memarg } => Instruction::I32Store8(convert_memarg(memarg)),
I32Store16 { memarg } => Instruction::I32Store16(convert_memarg(memarg)),
I64Store8 { memarg } => Instruction::I64Store8(convert_memarg(memarg)),
I64Store16 { memarg } => Instruction::I64Store16(convert_memarg(memarg)),
I64Store32 { memarg } => Instruction::I64Store32(convert_memarg(memarg)),
I32Eqz => Instruction::I32Eqz,
I32Eq => Instruction::I32Eq,
I32Ne => Instruction::I32Ne,
I32LtS => Instruction::I32LtS,
I32LtU => Instruction::I32LtU,
I32GtS => Instruction::I32GtS,
I32GtU => Instruction::I32GtU,
I32LeS => Instruction::I32LeS,
I32LeU => Instruction::I32LeU,
I32GeS => Instruction::I32GeS,
I32GeU => Instruction::I32GeU,
I64Eqz => Instruction::I64Eqz,
I64Eq => Instruction::I64Eq,
I64Ne => Instruction::I64Ne,
I64LtS => Instruction::I64LtS,
I64LtU => Instruction::I64LtU,
I64GtS => Instruction::I64GtS,
I64GtU => Instruction::I64GtU,
I64LeS => Instruction::I64LeS,
I64LeU => Instruction::I64LeU,
I64GeS => Instruction::I64GeS,
I64GeU => Instruction::I64GeU,
F32Eq => Instruction::F32Eq,
F32Ne => Instruction::F32Ne,
F32Lt => Instruction::F32Lt,
F32Gt => Instruction::F32Gt,
F32Le => Instruction::F32Le,
F32Ge => Instruction::F32Ge,
F64Eq => Instruction::F64Eq,
F64Ne => Instruction::F64Ne,
F64Lt => Instruction::F64Lt,
F64Gt => Instruction::F64Gt,
F64Le => Instruction::F64Le,
F64Ge => Instruction::F64Ge,
I32Clz => Instruction::I32Clz,
I32Ctz => Instruction::I32Ctz,
I32Popcnt => Instruction::I32Popcnt,
I32Add => Instruction::I32Add,
I32Sub => Instruction::I32Sub,
I32Mul => Instruction::I32Mul,
I32DivS => Instruction::I32DivS,
I32DivU => Instruction::I32DivU,
I32RemS => Instruction::I32RemS,
I32RemU => Instruction::I32RemU,
I32And => Instruction::I32And,
I32Or => Instruction::I32Or,
I32Xor => Instruction::I32Xor,
I32Shl => Instruction::I32Shl,
I32ShrS => Instruction::I32ShrS,
I32ShrU => Instruction::I32ShrU,
I32Rotl => Instruction::I32Rotl,
I32Rotr => Instruction::I32Rotr,
I64Clz => Instruction::I64Clz,
I64Ctz => Instruction::I64Ctz,
I64Popcnt => Instruction::I64Popcnt,
I64Add => Instruction::I64Add,
I64Sub => Instruction::I64Sub,
I64Mul => Instruction::I64Mul,
I64DivS => Instruction::I64DivS,
I64DivU => Instruction::I64DivU,
I64RemS => Instruction::I64RemS,
I64RemU => Instruction::I64RemU,
I64And => Instruction::I64And,
I64Or => Instruction::I64Or,
I64Xor => Instruction::I64Xor,
I64Shl => Instruction::I64Shl,
I64ShrS => Instruction::I64ShrS,
I64ShrU => Instruction::I64ShrU,
I64Rotl => Instruction::I64Rotl,
I64Rotr => Instruction::I64Rotr,
F32Abs => Instruction::F32Abs,
F32Neg => Instruction::F32Neg,
F32Ceil => Instruction::F32Ceil,
F32Floor => Instruction::F32Floor,
F32Trunc => Instruction::F32Trunc,
F32Nearest => Instruction::F32Nearest,
F32Sqrt => Instruction::F32Sqrt,
F32Add => Instruction::F32Add,
F32Sub => Instruction::F32Sub,
F32Mul => Instruction::F32Mul,
F32Div => Instruction::F32Div,
F32Min => Instruction::F32Min,
F32Max => Instruction::F32Max,
F32Copysign => Instruction::F32Copysign,
F64Abs => Instruction::F64Abs,
F64Neg => Instruction::F64Neg,
F64Ceil => Instruction::F64Ceil,
F64Floor => Instruction::F64Floor,
F64Trunc => Instruction::F64Trunc,
F64Nearest => Instruction::F64Nearest,
F64Sqrt => Instruction::F64Sqrt,
F64Add => Instruction::F64Add,
F64Sub => Instruction::F64Sub,
F64Mul => Instruction::F64Mul,
F64Div => Instruction::F64Div,
F64Min => Instruction::F64Min,
F64Max => Instruction::F64Max,
F64Copysign => Instruction::F64Copysign,
I32WrapI64 => Instruction::I32WrapI64,
I32TruncF32S => Instruction::I32TruncF32S,
I32TruncF32U => Instruction::I32TruncF32U,
I32TruncF64S => Instruction::I32TruncF64S,
I32TruncF64U => Instruction::I32TruncF64U,
I64ExtendI32S => Instruction::I64ExtendI32S,
I64ExtendI32U => Instruction::I64ExtendI32U,
I64TruncF32S => Instruction::I64TruncF32S,
I64TruncF32U => Instruction::I64TruncF32U,
I64TruncF64S => Instruction::I64TruncF64S,
I64TruncF64U => Instruction::I64TruncF64U,
F32ConvertI32S => Instruction::F32ConvertI32S,
F32ConvertI32U => Instruction::F32ConvertI32U,
F32ConvertI64S => Instruction::F32ConvertI64S,
F32ConvertI64U => Instruction::F32ConvertI64U,
F32DemoteF64 => Instruction::F32DemoteF64,
F64ConvertI32S => Instruction::F64ConvertI32S,
F64ConvertI32U => Instruction::F64ConvertI32U,
F64ConvertI64S => Instruction::F64ConvertI64S,
F64ConvertI64U => Instruction::F64ConvertI64U,
F64PromoteF32 => Instruction::F64PromoteF32,
I32ReinterpretF32 => Instruction::I32ReinterpretF32,
I64ReinterpretF64 => Instruction::I64ReinterpretF64,
F32ReinterpretI32 => Instruction::F32ReinterpretI32,
F64ReinterpretI64 => Instruction::F64ReinterpretI64,
op => {
return Err(crate::ParseError::UnsupportedOperator(format!(
"Unsupported instruction: {:?}",
op
)))
}
};
instructions.push(res);
}
if !labels_ptrs.is_empty() {
panic!(
"last_label_pointer should be None after processing all instructions: {:?}",
labels_ptrs
);
}
validator.finish(offset)?;
Ok(instructions.into_boxed_slice())
}
|
