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v86/src/rust/wasmgen/wasm_builder.rs

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use std::collections::HashMap;
use leb::{
write_fixed_leb16_at_idx, write_fixed_leb32_at_idx, write_leb_i32, write_leb_i64, write_leb_u32,
};
use std::mem::transmute;
use util::{SafeToU8, SafeToU16};
use wasmgen::wasm_opcodes as op;
#[derive(PartialEq)]
#[allow(non_camel_case_types)]
enum FunctionType {
FN0,
FN1,
FN2,
FN3,
FN0_RET,
FN0_RET_I64,
FN1_RET,
FN2_RET,
FN1_RET_I64,
FN1_F32_RET,
FN1_F64_RET,
FN2_I32_I64,
FN2_I64_I32,
FN2_I64_I32_RET,
FN2_I64_I32_RET_I64,
FN2_F32_I32,
FN3_RET,
FN3_I64_I32_I32,
FN3_I32_I64_I32,
FN3_I32_I64_I32_RET,
FN4_I32_I64_I64_I32_RET,
// When adding at the end, update LAST below
}
impl FunctionType {
pub fn of_u8(x: u8) -> FunctionType {
dbg_assert!(x <= FunctionType::LAST as u8);
unsafe { transmute(x) }
}
pub fn to_u8(self: FunctionType) -> u8 { self as u8 }
pub const LAST: FunctionType = FunctionType::FN4_I32_I64_I64_I32_RET;
}
pub const WASM_MODULE_ARGUMENT_COUNT: u8 = 1;
pub struct WasmBuilder {
output: Vec<u8>,
instruction_body: Vec<u8>,
idx_import_table_size: usize, // for rewriting once finished
idx_import_count: usize, // for rewriting once finished
idx_import_entries: usize, // for searching the imports
import_table_size: usize, // the current import table size (to avoid reading 2 byte leb)
import_count: u16, // same as above
initial_static_size: usize, // size of module after initialization, rest is drained on reset
// label for referencing block/if/loop constructs directly via branch instructions
next_label: Label,
label_stack: Vec<Label>,
label_to_depth: HashMap<Label, usize>,
free_locals_i32: Vec<WasmLocal>,
free_locals_i64: Vec<WasmLocalI64>,
local_count: u8,
pub arg_local_initial_state: WasmLocal,
}
#[derive(Eq, PartialEq)]
pub struct WasmLocal(u8);
impl WasmLocal {
pub fn idx(&self) -> u8 { self.0 }
/// Unsafe: Can result in multiple free's. Should only be used for locals that are used during
/// the whole module (for example, registers)
pub fn unsafe_clone(&self) -> WasmLocal { WasmLocal(self.0) }
}
pub struct WasmLocalI64(u8);
impl WasmLocalI64 {
pub fn idx(&self) -> u8 { self.0 }
}
#[derive(Copy, Clone, Eq, Hash, PartialEq)]
pub struct Label(u32);
impl Label {
const ZERO: Label = Label(0);
fn next(&self) -> Label { Label(self.0.wrapping_add(1)) }
}
impl WasmBuilder {
pub fn new() -> Self {
let mut b = WasmBuilder {
output: Vec::with_capacity(256),
instruction_body: Vec::with_capacity(256),
idx_import_table_size: 0,
idx_import_count: 0,
idx_import_entries: 0,
import_table_size: 2,
import_count: 0,
initial_static_size: 0,
label_to_depth: HashMap::new(),
label_stack: Vec::new(),
next_label: Label::ZERO,
free_locals_i32: Vec::with_capacity(8),
free_locals_i64: Vec::with_capacity(8),
local_count: 0,
arg_local_initial_state: WasmLocal(0),
};
b.init();
b
}
fn init(&mut self) {
self.output.extend("\0asm".as_bytes());
// wasm version in leb128, 4 bytes
self.output.push(op::WASM_VERSION);
self.output.push(0);
self.output.push(0);
self.output.push(0);
self.write_type_section();
self.write_import_section_preamble();
// store state of current pointers etc. so we can reset them later
self.initial_static_size = self.output.len();
}
pub fn reset(&mut self) {
self.output.drain(self.initial_static_size..);
self.set_import_table_size(2);
self.set_import_count(0);
self.instruction_body.clear();
self.free_locals_i32.clear();
self.free_locals_i64.clear();
self.local_count = 0;
dbg_assert!(self.label_to_depth.is_empty());
dbg_assert!(self.label_stack.is_empty());
self.next_label = Label::ZERO;
}
pub fn finish(&mut self) -> usize {
dbg_assert!(self.label_to_depth.is_empty());
dbg_assert!(self.label_stack.is_empty());
self.write_memory_import();
self.write_function_section();
self.write_export_section();
// write code section preamble
self.output.push(op::SC_CODE);
let idx_code_section_size = self.output.len(); // we will write to this location later
self.output.push(0);
self.output.push(0); // write temp val for now using 4 bytes
self.output.push(0);
self.output.push(0);
self.output.push(1); // number of function bodies: just 1
// same as above but for body size of the function
let idx_fn_body_size = self.output.len();
self.output.push(0);
self.output.push(0);
self.output.push(0);
self.output.push(0);
dbg_assert!(
self.local_count as usize == self.free_locals_i32.len() + self.free_locals_i64.len(),
"All locals should have been freed"
);
let free_locals_i32 = &self.free_locals_i32;
let free_locals_i64 = &self.free_locals_i64;
let locals = (0..self.local_count).map(|i| {
let local_index = WASM_MODULE_ARGUMENT_COUNT + i;
if free_locals_i64.iter().any(|v| v.idx() == local_index) {
op::TYPE_I64
}
else {
dbg_assert!(free_locals_i32.iter().any(|v| v.idx() == local_index));
op::TYPE_I32
}
});
let mut groups = vec![];
for local_type in locals {
if let Some(last) = groups.last_mut() {
let (last_type, last_count) = *last;
if last_type == local_type {
*last = (local_type, last_count + 1);
continue;
}
}
groups.push((local_type, 1));
}
dbg_assert!(groups.len() < 128);
self.output.push(groups.len().safe_to_u8());
for (local_type, count) in groups {
dbg_assert!(count < 128);
self.output.push(count);
self.output.push(local_type);
}
self.output.append(&mut self.instruction_body);
self.output.push(op::OP_END);
// write the actual sizes to the pointer locations stored above. We subtract 4 from the actual
// value because the ptr itself points to four bytes
let fn_body_size = (self.output.len() - idx_fn_body_size - 4) as u32;
write_fixed_leb32_at_idx(&mut self.output, idx_fn_body_size, fn_body_size);
let code_section_size = (self.output.len() - idx_code_section_size - 4) as u32;
write_fixed_leb32_at_idx(&mut self.output, idx_code_section_size, code_section_size);
self.output.len()
}
pub fn write_type_section(&mut self) {
self.output.push(op::SC_TYPE);
let idx_section_size = self.output.len();
self.output.push(0);
self.output.push(0);
let nr_of_function_types = FunctionType::to_u8(FunctionType::LAST) + 1;
dbg_assert!(nr_of_function_types < 128);
self.output.push(nr_of_function_types);
for i in 0..(nr_of_function_types) {
match FunctionType::of_u8(i) {
FunctionType::FN0 => {
self.output.push(op::TYPE_FUNC);
self.output.push(0); // no args
self.output.push(0); // no return val
},
FunctionType::FN1 => {
self.output.push(op::TYPE_FUNC);
self.output.push(1);
self.output.push(op::TYPE_I32);
self.output.push(0);
},
FunctionType::FN2 => {
self.output.push(op::TYPE_FUNC);
self.output.push(2);
self.output.push(op::TYPE_I32);
self.output.push(op::TYPE_I32);
self.output.push(0);
},
FunctionType::FN3 => {
self.output.push(op::TYPE_FUNC);
self.output.push(3);
self.output.push(op::TYPE_I32);
self.output.push(op::TYPE_I32);
self.output.push(op::TYPE_I32);
self.output.push(0);
},
FunctionType::FN0_RET => {
self.output.push(op::TYPE_FUNC);
self.output.push(0);
self.output.push(1);
self.output.push(op::TYPE_I32);
},
FunctionType::FN0_RET_I64 => {
self.output.push(op::TYPE_FUNC);
self.output.push(0);
self.output.push(1);
self.output.push(op::TYPE_I64);
},
FunctionType::FN1_RET => {
self.output.push(op::TYPE_FUNC);
self.output.push(1);
self.output.push(op::TYPE_I32);
self.output.push(1);
self.output.push(op::TYPE_I32);
},
FunctionType::FN2_RET => {
self.output.push(op::TYPE_FUNC);
self.output.push(2);
self.output.push(op::TYPE_I32);
self.output.push(op::TYPE_I32);
self.output.push(1);
self.output.push(op::TYPE_I32);
},
FunctionType::FN1_RET_I64 => {
self.output.push(op::TYPE_FUNC);
self.output.push(1);
self.output.push(op::TYPE_I32);
self.output.push(1);
self.output.push(op::TYPE_I64);
},
FunctionType::FN1_F32_RET => {
self.output.push(op::TYPE_FUNC);
self.output.push(1);
self.output.push(op::TYPE_F32);
self.output.push(1);
self.output.push(op::TYPE_I32);
},
FunctionType::FN1_F64_RET => {
self.output.push(op::TYPE_FUNC);
self.output.push(1);
self.output.push(op::TYPE_F64);
self.output.push(1);
self.output.push(op::TYPE_I32);
},
FunctionType::FN2_I32_I64 => {
self.output.push(op::TYPE_FUNC);
self.output.push(2);
self.output.push(op::TYPE_I32);
self.output.push(op::TYPE_I64);
self.output.push(0);
},
FunctionType::FN2_I64_I32 => {
self.output.push(op::TYPE_FUNC);
self.output.push(2);
self.output.push(op::TYPE_I64);
self.output.push(op::TYPE_I32);
self.output.push(0);
},
FunctionType::FN2_I64_I32_RET => {
self.output.push(op::TYPE_FUNC);
self.output.push(2);
self.output.push(op::TYPE_I64);
self.output.push(op::TYPE_I32);
self.output.push(1);
self.output.push(op::TYPE_I32);
},
FunctionType::FN2_I64_I32_RET_I64 => {
self.output.push(op::TYPE_FUNC);
self.output.push(2);
self.output.push(op::TYPE_I64);
self.output.push(op::TYPE_I32);
self.output.push(1);
self.output.push(op::TYPE_I64);
},
FunctionType::FN2_F32_I32 => {
self.output.push(op::TYPE_FUNC);
self.output.push(2);
self.output.push(op::TYPE_F32);
self.output.push(op::TYPE_I32);
self.output.push(0);
},
FunctionType::FN3_RET => {
self.output.push(op::TYPE_FUNC);
self.output.push(3);
self.output.push(op::TYPE_I32);
self.output.push(op::TYPE_I32);
self.output.push(op::TYPE_I32);
self.output.push(1);
self.output.push(op::TYPE_I32);
},
FunctionType::FN3_I64_I32_I32 => {
self.output.push(op::TYPE_FUNC);
self.output.push(3);
self.output.push(op::TYPE_I64);
self.output.push(op::TYPE_I32);
self.output.push(op::TYPE_I32);
self.output.push(0);
},
FunctionType::FN3_I32_I64_I32 => {
self.output.push(op::TYPE_FUNC);
self.output.push(3);
self.output.push(op::TYPE_I32);
self.output.push(op::TYPE_I64);
self.output.push(op::TYPE_I32);
self.output.push(0);
},
FunctionType::FN3_I32_I64_I32_RET => {
self.output.push(op::TYPE_FUNC);
self.output.push(3);
self.output.push(op::TYPE_I32);
self.output.push(op::TYPE_I64);
self.output.push(op::TYPE_I32);
self.output.push(1);
self.output.push(op::TYPE_I32);
},
FunctionType::FN4_I32_I64_I64_I32_RET => {
self.output.push(op::TYPE_FUNC);
self.output.push(4);
self.output.push(op::TYPE_I32);
self.output.push(op::TYPE_I64);
self.output.push(op::TYPE_I64);
self.output.push(op::TYPE_I32);
self.output.push(1);
self.output.push(op::TYPE_I32);
},
}
}
let new_len = self.output.len();
let size = (new_len - 2) - idx_section_size;
write_fixed_leb16_at_idx(&mut self.output, idx_section_size, size.safe_to_u16());
}
/// Goes over the import block to find index of an import entry by function name
pub fn get_import_index(&self, fn_name: &str) -> Option<u16> {
let mut offset = self.idx_import_entries;
for i in 0..self.import_count {
offset += 1; // skip length of module name
offset += 1; // skip module name itself
let len = self.output[offset] as usize;
offset += 1;
let name = self
.output
.get(offset..(offset + len))
.expect("get function name");
if name == fn_name.as_bytes() {
return Some(i);
}
offset += len; // skip the string
offset += 1; // skip import kind
offset += 1; // skip type index
}
None
}
pub fn set_import_count(&mut self, count: u16) {
dbg_assert!(count < 0x4000);
self.import_count = count;
let idx_import_count = self.idx_import_count;
write_fixed_leb16_at_idx(&mut self.output, idx_import_count, count);
}
pub fn set_import_table_size(&mut self, size: usize) {
dbg_assert!(size < 0x4000);
self.import_table_size = size;
let idx_import_table_size = self.idx_import_table_size;
write_fixed_leb16_at_idx(&mut self.output, idx_import_table_size, size.safe_to_u16());
}
pub fn write_import_section_preamble(&mut self) {
self.output.push(op::SC_IMPORT);
self.idx_import_table_size = self.output.len();
self.output.push(1 | 0b10000000);
self.output.push(2); // 2 in 2 byte leb
self.idx_import_count = self.output.len();
self.output.push(1 | 0b10000000);
self.output.push(0); // 0 in 2 byte leb
// here after starts the actual list of imports
self.idx_import_entries = self.output.len();
}
pub fn write_memory_import(&mut self) {
self.output.push(1);
self.output.push('e' as u8);
self.output.push(1);
self.output.push('m' as u8);
self.output.push(op::EXT_MEMORY);
self.output.push(0); // memory flag, 0 for no maximum memory limit present
write_leb_u32(&mut self.output, 64); // initial memory length of 64 pages, takes 1 bytes in leb128
let new_import_count = self.import_count + 1;
self.set_import_count(new_import_count);
let new_table_size = self.import_table_size + 7;
self.set_import_table_size(new_table_size);
}
fn write_import_entry(&mut self, fn_name: &str, type_index: FunctionType) -> u16 {
self.output.push(1); // length of module name
self.output.push('e' as u8); // module name
self.output.push(fn_name.len().safe_to_u8());
self.output.extend(fn_name.as_bytes());
self.output.push(op::EXT_FUNCTION);
self.output.push(type_index.to_u8());
let new_import_count = self.import_count + 1;
self.set_import_count(new_import_count);
let new_table_size = self.import_table_size + 1 + 1 + 1 + fn_name.len() + 1 + 1;
self.set_import_table_size(new_table_size);
self.import_count - 1
}
pub fn write_function_section(&mut self) {
self.output.push(op::SC_FUNCTION);
self.output.push(2); // length of this section
self.output.push(1); // count of signature indices
self.output.push(FunctionType::FN1.to_u8());
}
pub fn write_export_section(&mut self) {
self.output.push(op::SC_EXPORT);
self.output.push(1 + 1 + 1 + 1 + 2); // size of this section
self.output.push(1); // count of table: just one function exported
self.output.push(1); // length of exported function name
self.output.push('f' as u8); // function name
self.output.push(op::EXT_FUNCTION);
// index of the exported function
// function space starts with imports. index of last import is import count - 1
// the last import however is a memory, so we subtract one from that
let next_op_idx = self.output.len();
self.output.push(0);
self.output.push(0); // add 2 bytes for writing 16 byte val
write_fixed_leb16_at_idx(&mut self.output, next_op_idx, self.import_count - 1);
}
fn get_fn_idx(&mut self, fn_name: &str, type_index: FunctionType) -> u16 {
match self.get_import_index(fn_name) {
Some(idx) => idx,
None => {
let idx = self.write_import_entry(fn_name, type_index);
idx
},
}
}
pub fn get_output_ptr(&self) -> *const u8 { self.output.as_ptr() }
pub fn get_output_len(&self) -> u32 { self.output.len() as u32 }
fn open_block(&mut self) -> Label {
let label = self.next_label;
self.next_label = self.next_label.next();
self.label_to_depth
.insert(label, self.label_stack.len() + 1);
self.label_stack.push(label);
label
}
fn close_block(&mut self) {
let label = self.label_stack.pop().unwrap();
let old_depth = self.label_to_depth.remove(&label).unwrap();
dbg_assert!(self.label_to_depth.len() + 1 == old_depth);
}
#[must_use = "local allocated but not used"]
fn alloc_local(&mut self) -> WasmLocal {
match self.free_locals_i32.pop() {
Some(local) => local,
None => {
let new_idx = self.local_count + WASM_MODULE_ARGUMENT_COUNT;
self.local_count = self.local_count.checked_add(1).unwrap();
WasmLocal(new_idx)
},
}
}
pub fn free_local(&mut self, local: WasmLocal) {
dbg_assert!(
(WASM_MODULE_ARGUMENT_COUNT..self.local_count + WASM_MODULE_ARGUMENT_COUNT)
.contains(&local.0)
);
self.free_locals_i32.push(local)
}
#[must_use = "local allocated but not used"]
pub fn set_new_local(&mut self) -> WasmLocal {
let local = self.alloc_local();
self.instruction_body.push(op::OP_SETLOCAL);
self.instruction_body.push(local.idx());
local
}
#[must_use = "local allocated but not used"]
pub fn tee_new_local(&mut self) -> WasmLocal {
let local = self.alloc_local();
self.instruction_body.push(op::OP_TEELOCAL);
self.instruction_body.push(local.idx());
local
}
pub fn set_local(&mut self, local: &WasmLocal) {
self.instruction_body.push(op::OP_SETLOCAL);
self.instruction_body.push(local.idx());
}
pub fn tee_local(&mut self, local: &WasmLocal) {
self.instruction_body.push(op::OP_TEELOCAL);
self.instruction_body.push(local.idx());
}
pub fn get_local(&mut self, local: &WasmLocal) {
self.instruction_body.push(op::OP_GETLOCAL);
self.instruction_body.push(local.idx());
}
#[must_use = "local allocated but not used"]
fn alloc_local_i64(&mut self) -> WasmLocalI64 {
match self.free_locals_i64.pop() {
Some(local) => local,
None => {
let new_idx = self.local_count + WASM_MODULE_ARGUMENT_COUNT;
self.local_count += 1;
WasmLocalI64(new_idx)
},
}
}
pub fn free_local_i64(&mut self, local: WasmLocalI64) {
dbg_assert!(
(WASM_MODULE_ARGUMENT_COUNT..self.local_count + WASM_MODULE_ARGUMENT_COUNT)
.contains(&local.0)
);
self.free_locals_i64.push(local)
}
#[must_use = "local allocated but not used"]
pub fn set_new_local_i64(&mut self) -> WasmLocalI64 {
let local = self.alloc_local_i64();
self.instruction_body.push(op::OP_SETLOCAL);
self.instruction_body.push(local.idx());
local
}
#[must_use = "local allocated but not used"]
pub fn tee_new_local_i64(&mut self) -> WasmLocalI64 {
let local = self.alloc_local_i64();
self.instruction_body.push(op::OP_TEELOCAL);
self.instruction_body.push(local.idx());
local
}
pub fn get_local_i64(&mut self, local: &WasmLocalI64) {
self.instruction_body.push(op::OP_GETLOCAL);
self.instruction_body.push(local.idx());
}
pub fn const_i32(&mut self, v: i32) {
self.instruction_body.push(op::OP_I32CONST);
write_leb_i32(&mut self.instruction_body, v);
}
pub fn const_i64(&mut self, v: i64) {
self.instruction_body.push(op::OP_I64CONST);
write_leb_i64(&mut self.instruction_body, v);
}
pub fn load_fixed_u8(&mut self, addr: u32) {
self.const_i32(addr as i32);
self.load_u8(0);
}
pub fn load_fixed_u16(&mut self, addr: u32) {
// doesn't cause a failure in the generated code, but it will be much slower
dbg_assert!((addr & 1) == 0);
self.const_i32(addr as i32);
self.instruction_body.push(op::OP_I32LOAD16U);
self.instruction_body.push(op::MEM_ALIGN16);
self.instruction_body.push(0); // immediate offset
}
pub fn load_fixed_i32(&mut self, addr: u32) {
// doesn't cause a failure in the generated code, but it will be much slower
dbg_assert!((addr & 3) == 0);
self.const_i32(addr as i32);
self.load_aligned_i32(0);
}
pub fn load_fixed_i64(&mut self, addr: u32) {
// doesn't cause a failure in the generated code, but it will be much slower
dbg_assert!((addr & 7) == 0);
self.const_i32(addr as i32);
self.load_aligned_i64(0);
}
pub fn load_u8(&mut self, byte_offset: u32) {
self.instruction_body.push(op::OP_I32LOAD8U);
self.instruction_body.push(op::MEM_NO_ALIGN);
write_leb_u32(&mut self.instruction_body, byte_offset);
}
pub fn load_unaligned_i64(&mut self, byte_offset: u32) {
self.instruction_body.push(op::OP_I64LOAD);
self.instruction_body.push(op::MEM_NO_ALIGN);
write_leb_u32(&mut self.instruction_body, byte_offset);
}
pub fn load_unaligned_i32(&mut self, byte_offset: u32) {
self.instruction_body.push(op::OP_I32LOAD);
self.instruction_body.push(op::MEM_NO_ALIGN);
write_leb_u32(&mut self.instruction_body, byte_offset);
}
pub fn load_unaligned_u16(&mut self, byte_offset: u32) {
self.instruction_body.push(op::OP_I32LOAD16U);
self.instruction_body.push(op::MEM_NO_ALIGN);
write_leb_u32(&mut self.instruction_body, byte_offset);
}
pub fn load_aligned_f64(&mut self, byte_offset: u32) {
self.instruction_body.push(op::OP_F64LOAD);
self.instruction_body.push(op::MEM_ALIGN64);
write_leb_u32(&mut self.instruction_body, byte_offset);
}
pub fn load_aligned_i64(&mut self, byte_offset: u32) {
self.instruction_body.push(op::OP_I64LOAD);
self.instruction_body.push(op::MEM_ALIGN64);
write_leb_u32(&mut self.instruction_body, byte_offset);
}
pub fn load_aligned_f32(&mut self, byte_offset: u32) {
self.instruction_body.push(op::OP_F32LOAD);
self.instruction_body.push(op::MEM_ALIGN32);
write_leb_u32(&mut self.instruction_body, byte_offset);
}
pub fn load_aligned_i32(&mut self, byte_offset: u32) {
self.instruction_body.push(op::OP_I32LOAD);
self.instruction_body.push(op::MEM_ALIGN32);
write_leb_u32(&mut self.instruction_body, byte_offset);
}
pub fn load_aligned_u16(&mut self, byte_offset: u32) {
self.instruction_body.push(op::OP_I32LOAD16U);
self.instruction_body.push(op::MEM_ALIGN16);
write_leb_u32(&mut self.instruction_body, byte_offset);
}
pub fn store_u8(&mut self, byte_offset: u32) {
self.instruction_body.push(op::OP_I32STORE8);
self.instruction_body.push(op::MEM_NO_ALIGN);
write_leb_u32(&mut self.instruction_body, byte_offset);
}
pub fn store_aligned_u16(&mut self, byte_offset: u32) {
self.instruction_body.push(op::OP_I32STORE16);
self.instruction_body.push(op::MEM_ALIGN16);
write_leb_u32(&mut self.instruction_body, byte_offset);
}
pub fn store_aligned_i32(&mut self, byte_offset: u32) {
self.instruction_body.push(op::OP_I32STORE);
self.instruction_body.push(op::MEM_ALIGN32);
write_leb_u32(&mut self.instruction_body, byte_offset);
}
pub fn store_aligned_i64(&mut self, byte_offset: u32) {
self.instruction_body.push(op::OP_I64STORE);
self.instruction_body.push(op::MEM_ALIGN64);
write_leb_u32(&mut self.instruction_body, byte_offset);
}
pub fn store_unaligned_u16(&mut self, byte_offset: u32) {
self.instruction_body.push(op::OP_I32STORE16);
self.instruction_body.push(op::MEM_NO_ALIGN);
write_leb_u32(&mut self.instruction_body, byte_offset);
}
pub fn store_unaligned_i32(&mut self, byte_offset: u32) {
self.instruction_body.push(op::OP_I32STORE);
self.instruction_body.push(op::MEM_NO_ALIGN);
write_leb_u32(&mut self.instruction_body, byte_offset);
}
pub fn store_unaligned_i64(&mut self, byte_offset: u32) {
self.instruction_body.push(op::OP_I64STORE);
self.instruction_body.push(op::MEM_NO_ALIGN);
write_leb_u32(&mut self.instruction_body, byte_offset);
}
pub fn increment_fixed_i64(&mut self, byte_offset: u32, n: i64) {
self.const_i32(byte_offset as i32);
self.load_fixed_i64(byte_offset);
self.const_i64(n);
self.add_i64();
self.store_aligned_i64(0);
}
pub fn add_i32(&mut self) { self.instruction_body.push(op::OP_I32ADD); }
pub fn add_i64(&mut self) { self.instruction_body.push(op::OP_I64ADD); }
pub fn sub_i32(&mut self) { self.instruction_body.push(op::OP_I32SUB); }
pub fn and_i32(&mut self) { self.instruction_body.push(op::OP_I32AND); }
pub fn or_i32(&mut self) { self.instruction_body.push(op::OP_I32OR); }
pub fn or_i64(&mut self) { self.instruction_body.push(op::OP_I64OR); }
pub fn xor_i32(&mut self) { self.instruction_body.push(op::OP_I32XOR); }
pub fn mul_i32(&mut self) { self.instruction_body.push(op::OP_I32MUL); }
pub fn mul_i64(&mut self) { self.instruction_body.push(op::OP_I64MUL); }
pub fn div_i64(&mut self) { self.instruction_body.push(op::OP_I64DIVU); }
pub fn rem_i64(&mut self) { self.instruction_body.push(op::OP_I64REMU); }
pub fn rotl_i32(&mut self) { self.instruction_body.push(op::OP_I32ROTL); }
pub fn shl_i32(&mut self) { self.instruction_body.push(op::OP_I32SHL); }
pub fn shl_i64(&mut self) { self.instruction_body.push(op::OP_I64SHL); }
pub fn shr_u_i32(&mut self) { self.instruction_body.push(op::OP_I32SHRU); }
pub fn shr_u_i64(&mut self) { self.instruction_body.push(op::OP_I64SHRU); }
pub fn shr_s_i32(&mut self) { self.instruction_body.push(op::OP_I32SHRS); }
pub fn eq_i32(&mut self) { self.instruction_body.push(op::OP_I32EQ); }
pub fn eq_i64(&mut self) { self.instruction_body.push(op::OP_I64EQ); }
pub fn ne_i32(&mut self) { self.instruction_body.push(op::OP_I32NE); }
pub fn ne_i64(&mut self) { self.instruction_body.push(op::OP_I64NE); }
pub fn le_i32(&mut self) { self.instruction_body.push(op::OP_I32LES); }
pub fn lt_i32(&mut self) { self.instruction_body.push(op::OP_I32LTS); }
pub fn ge_i32(&mut self) { self.instruction_body.push(op::OP_I32GES); }
pub fn gt_i32(&mut self) { self.instruction_body.push(op::OP_I32GTS); }
pub fn gtu_i32(&mut self) { self.instruction_body.push(op::OP_I32GTU); }
pub fn geu_i32(&mut self) { self.instruction_body.push(op::OP_I32GEU); }
pub fn ltu_i32(&mut self) { self.instruction_body.push(op::OP_I32LTU); }
pub fn leu_i32(&mut self) { self.instruction_body.push(op::OP_I32LEU); }
pub fn gtu_i64(&mut self) { self.instruction_body.push(op::OP_I64GTU); }
pub fn reinterpret_i32_as_f32(&mut self) {
self.instruction_body.push(op::OP_F32REINTERPRETI32);
}
//pub fn reinterpret_f32_as_i32(&mut self) {
// self.instruction_body.push(op::OP_I32REINTERPRETF32);
//}
pub fn reinterpret_i64_as_f64(&mut self) {
self.instruction_body.push(op::OP_F64REINTERPRETI64);
}
//pub fn reinterpret_f64_as_i64(&mut self) {
// self.instruction_body.push(op::OP_I64REINTERPRETF64);
//}
//pub fn promote_f32_to_f64(&mut self) { self.instruction_body.push(op::OP_F64PROMOTEF32); }
//pub fn demote_f64_to_f32(&mut self) { self.instruction_body.push(op::OP_F32DEMOTEF64); }
//pub fn convert_i32_to_f64(&mut self) { self.instruction_body.push(op::OP_F64CONVERTSI32); }
//pub fn convert_i64_to_f64(&mut self) { self.instruction_body.push(op::OP_F64CONVERTSI64); }
pub fn extend_unsigned_i32_to_i64(&mut self) {
self.instruction_body.push(op::OP_I64EXTENDUI32);
}
pub fn extend_signed_i32_to_i64(&mut self) { self.instruction_body.push(op::OP_I64EXTENDSI32); }
pub fn wrap_i64_to_i32(&mut self) { self.instruction_body.push(op::OP_I32WRAPI64); }
pub fn eqz_i32(&mut self) { self.instruction_body.push(op::OP_I32EQZ); }
pub fn select(&mut self) { self.instruction_body.push(op::OP_SELECT); }
pub fn if_i32(&mut self) {
self.open_block();
self.instruction_body.push(op::OP_IF);
self.instruction_body.push(op::TYPE_I32);
}
#[allow(dead_code)]
pub fn if_i64(&mut self) {
self.open_block();
self.instruction_body.push(op::OP_IF);
self.instruction_body.push(op::TYPE_I64);
}
#[allow(dead_code)]
pub fn block_i32(&mut self) {
self.open_block();
self.instruction_body.push(op::OP_BLOCK);
self.instruction_body.push(op::TYPE_I32);
}
pub fn if_void(&mut self) {
self.open_block();
self.instruction_body.push(op::OP_IF);
self.instruction_body.push(op::TYPE_VOID_BLOCK);
}
pub fn else_(&mut self) {
dbg_assert!(!self.label_stack.is_empty());
self.instruction_body.push(op::OP_ELSE);
}
pub fn loop_void(&mut self) -> Label {
self.instruction_body.push(op::OP_LOOP);
self.instruction_body.push(op::TYPE_VOID_BLOCK);
self.open_block()
}
pub fn block_void(&mut self) -> Label {
self.instruction_body.push(op::OP_BLOCK);
self.instruction_body.push(op::TYPE_VOID_BLOCK);
self.open_block()
}
pub fn block_end(&mut self) {
self.close_block();
self.instruction_body.push(op::OP_END);
}
pub fn return_(&mut self) { self.instruction_body.push(op::OP_RETURN); }
#[allow(dead_code)]
pub fn drop_(&mut self) { self.instruction_body.push(op::OP_DROP); }
pub fn brtable(
&mut self,
default_case: Label,
cases: &mut dyn std::iter::ExactSizeIterator<Item = &Label>,
) {
self.instruction_body.push(op::OP_BRTABLE);
write_leb_u32(&mut self.instruction_body, cases.len() as u32);
for case in cases {
self.write_label(*case);
}
self.write_label(default_case);
}
pub fn br(&mut self, label: Label) {
self.instruction_body.push(op::OP_BR);
self.write_label(label);
}
pub fn br_if(&mut self, label: Label) {
self.instruction_body.push(op::OP_BRIF);
self.write_label(label);
}
fn write_label(&mut self, label: Label) {
let depth = *self.label_to_depth.get(&label).unwrap();
dbg_assert!(depth <= self.label_stack.len());
write_leb_u32(
&mut self.instruction_body,
(self.label_stack.len() - depth) as u32,
);
}
fn call_fn(&mut self, name: &str, function: FunctionType) {
let i = self.get_fn_idx(name, function);
self.instruction_body.push(op::OP_CALL);
write_leb_u32(&mut self.instruction_body, i as u32);
}
pub fn call_fn0(&mut self, name: &str) { self.call_fn(name, FunctionType::FN0) }
pub fn call_fn0_ret(&mut self, name: &str) { self.call_fn(name, FunctionType::FN0_RET) }
pub fn call_fn0_ret_i64(&mut self, name: &str) { self.call_fn(name, FunctionType::FN0_RET_I64) }
pub fn call_fn1(&mut self, name: &str) { self.call_fn(name, FunctionType::FN1) }
pub fn call_fn1_ret(&mut self, name: &str) { self.call_fn(name, FunctionType::FN1_RET) }
pub fn call_fn1_ret_i64(&mut self, name: &str) { self.call_fn(name, FunctionType::FN1_RET_I64) }
pub fn call_fn1_f32_ret(&mut self, name: &str) { self.call_fn(name, FunctionType::FN1_F32_RET) }
pub fn call_fn1_f64_ret(&mut self, name: &str) { self.call_fn(name, FunctionType::FN1_F64_RET) }
pub fn call_fn2(&mut self, name: &str) { self.call_fn(name, FunctionType::FN2) }
pub fn call_fn2_i32_i64(&mut self, name: &str) { self.call_fn(name, FunctionType::FN2_I32_I64) }
pub fn call_fn2_i64_i32(&mut self, name: &str) { self.call_fn(name, FunctionType::FN2_I64_I32) }
pub fn call_fn2_i64_i32_ret(&mut self, name: &str) {
self.call_fn(name, FunctionType::FN2_I64_I32_RET)
}
pub fn call_fn2_i64_i32_ret_i64(&mut self, name: &str) {
self.call_fn(name, FunctionType::FN2_I64_I32_RET_I64)
}
pub fn call_fn2_f32_i32(&mut self, name: &str) { self.call_fn(name, FunctionType::FN2_F32_I32) }
pub fn call_fn2_ret(&mut self, name: &str) { self.call_fn(name, FunctionType::FN2_RET) }
pub fn call_fn3(&mut self, name: &str) { self.call_fn(name, FunctionType::FN3) }
pub fn call_fn3_ret(&mut self, name: &str) { self.call_fn(name, FunctionType::FN3_RET) }
pub fn call_fn3_i64_i32_i32(&mut self, name: &str) {
self.call_fn(name, FunctionType::FN3_I64_I32_I32)
}
pub fn call_fn3_i32_i64_i32(&mut self, name: &str) {
self.call_fn(name, FunctionType::FN3_I32_I64_I32)
}
pub fn call_fn3_i32_i64_i32_ret(&mut self, name: &str) {
self.call_fn(name, FunctionType::FN3_I32_I64_I32_RET)
}
pub fn call_fn4_i32_i64_i64_i32_ret(&mut self, name: &str) {
self.call_fn(name, FunctionType::FN4_I32_I64_I64_I32_RET)
}
pub fn unreachable(&mut self) { self.instruction_body.push(op::OP_UNREACHABLE) }
pub fn instruction_body_length(&self) -> u32 { self.instruction_body.len() as u32 }
}
#[cfg(test)]
mod tests {
use std::fs::File;
use std::io::Write;
use wasmgen::wasm_builder;
use wasmgen::wasm_builder::FunctionType;
#[test]
fn import_table_management() {
let mut w = wasm_builder::WasmBuilder::new();
assert_eq!(0, w.get_fn_idx("foo", FunctionType::FN0));
assert_eq!(1, w.get_fn_idx("bar", FunctionType::FN1));
assert_eq!(0, w.get_fn_idx("foo", FunctionType::FN0));
assert_eq!(2, w.get_fn_idx("baz", FunctionType::FN2));
}
#[test]
fn builder_test() {
let mut m = wasm_builder::WasmBuilder::new();
m.call_fn("foo", FunctionType::FN0);
m.call_fn("bar", FunctionType::FN0);
let local0 = m.alloc_local(); // for ensuring that reset clears previous locals
m.free_local(local0);
m.finish();
m.reset();
m.const_i32(2);
m.call_fn("baz", FunctionType::FN1_RET);
m.call_fn("foo", FunctionType::FN1);
m.const_i32(10);
let local1 = m.alloc_local();
m.tee_local(&local1); // local1 = 10
m.const_i32(20);
m.add_i32();
let local2 = m.alloc_local();
m.tee_local(&local2); // local2 = 30
m.free_local(local1);
let local3 = m.alloc_local();
assert_eq!(local3.idx(), wasm_builder::WASM_MODULE_ARGUMENT_COUNT);
m.free_local(local2);
m.free_local(local3);
m.const_i32(30);
m.ne_i32();
m.if_void();
m.unreachable();
m.block_end();
m.finish();
let op_ptr = m.get_output_ptr();
let op_len = m.get_output_len();
dbg_log!("op_ptr: {:?}, op_len: {:?}", op_ptr, op_len);
let mut f = File::create("build/dummy_output.wasm").expect("creating dummy_output.wasm");
f.write_all(&m.output).expect("write dummy_output.wasm");
}
}
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