mirror of
https://github.com/roc-lang/roc.git
synced 2025-09-27 05:49:08 +00:00
1547 lines
59 KiB
Rust
1547 lines
59 KiB
Rust
use crate::{
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generic64::{Assembler, CallConv, RegTrait},
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sign_extended_int_builtins, single_register_floats, single_register_int_builtins,
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single_register_integers, single_register_layouts, Env,
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};
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use bumpalo::collections::Vec;
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use roc_builtins::bitcode::{FloatWidth, IntWidth};
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use roc_collections::all::{MutMap, MutSet};
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use roc_error_macros::internal_error;
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use roc_module::symbol::Symbol;
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use roc_mono::{
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ir::{JoinPointId, Param},
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layout::{
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Builtin, InLayout, Layout, LayoutInterner, LayoutRepr, STLayoutInterner, TagIdIntType,
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UnionLayout,
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},
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};
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use roc_target::TargetInfo;
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use std::cmp::max;
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use std::marker::PhantomData;
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use std::rc::Rc;
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use RegStorage::*;
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use StackStorage::*;
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use Storage::*;
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#[derive(Copy, Clone, Debug, PartialEq, Eq)]
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pub enum RegStorage<GeneralReg: RegTrait, FloatReg: RegTrait> {
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General(GeneralReg),
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Float(FloatReg),
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}
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#[derive(Copy, Clone, Debug, PartialEq, Eq)]
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enum StackStorage<GeneralReg: RegTrait, FloatReg: RegTrait> {
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/// Primitives are 8 bytes or less. That generally live in registers but can move stored on the stack.
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/// Their data, when on the stack, must always be 8 byte aligned and will be moved as a block.
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/// They are never part of a struct, union, or more complex value.
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/// The rest of the bytes should be the sign extension due to how these are loaded.
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Primitive {
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// Offset from the base pointer in bytes.
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base_offset: i32,
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// Optional register also holding the value.
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reg: Option<RegStorage<GeneralReg, FloatReg>>,
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},
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/// Referenced Primitives are primitives within a complex structures.
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/// They have no guarantees about the bits around them and cannot simply be loaded as an 8 byte value.
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/// For example, a U8 in a struct must be loaded as a single byte and sign extended.
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/// If it was loaded as an 8 byte value, a bunch of garbage data would be loaded with the U8.
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/// After loading, they should just be stored in a register, removing the reference.
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ReferencedPrimitive {
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// Offset from the base pointer in bytes.
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base_offset: i32,
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// Size on the stack in bytes.
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size: u32,
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// Whether or not the data is need to be sign extended on load.
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// If not, it must be zero extended.
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sign_extend: bool,
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},
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/// Complex data (lists, unions, structs, str) stored on the stack.
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/// Note, this is also used for referencing a value within a struct/union.
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/// It has no alignment guarantees.
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/// When a primitive value is being loaded from this, it should be moved into a register.
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/// To start, the primitive can just be loaded as a ReferencePrimitive.
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Complex {
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// Offset from the base pointer in bytes.
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base_offset: i32,
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// Size on the stack in bytes.
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size: u32,
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// TODO: investigate if storing a reg here for special values is worth it.
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// For example, the ptr in list.get/list.set
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// Instead, it would probably be better to change the incoming IR to load the pointer once and then use it multiple times.
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},
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}
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#[derive(Copy, Clone, Debug, PartialEq, Eq)]
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enum Storage<GeneralReg: RegTrait, FloatReg: RegTrait> {
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Reg(RegStorage<GeneralReg, FloatReg>),
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Stack(StackStorage<GeneralReg, FloatReg>),
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NoData,
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}
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#[derive(Clone)]
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pub struct StorageManager<
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'a,
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'r,
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GeneralReg: RegTrait,
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FloatReg: RegTrait,
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ASM: Assembler<GeneralReg, FloatReg>,
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CC: CallConv<GeneralReg, FloatReg, ASM>,
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> {
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phantom_cc: PhantomData<CC>,
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phantom_asm: PhantomData<ASM>,
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pub(crate) env: &'r Env<'a>,
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target_info: TargetInfo,
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// Data about where each symbol is stored.
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symbol_storage_map: MutMap<Symbol, Storage<GeneralReg, FloatReg>>,
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// A map from symbol to its owning allocation.
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// This is only used for complex data on the stack and its references.
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// In the case that subdata is still referenced from an overall structure,
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// We can't free the entire structure until the subdata is no longer needed.
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// If a symbol has only one reference, we can free it.
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allocation_map: MutMap<Symbol, Rc<(i32, u32)>>,
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// The storage for parameters of a join point.
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// When jumping to the join point, the parameters should be setup to match this.
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join_param_map: MutMap<JoinPointId, Vec<'a, Storage<GeneralReg, FloatReg>>>,
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// This should probably be smarter than a vec.
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// There are certain registers we should always use first. With pushing and popping, this could get mixed.
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general_free_regs: Vec<'a, GeneralReg>,
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float_free_regs: Vec<'a, FloatReg>,
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// The last major thing we need is a way to decide what reg to free when all of them are full.
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// Theoretically we want a basic lru cache for the currently loaded symbols.
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// For now just a vec of used registers and the symbols they contain.
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general_used_regs: Vec<'a, (GeneralReg, Symbol)>,
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float_used_regs: Vec<'a, (FloatReg, Symbol)>,
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// TODO: it probably would be faster to make these a list that linearly scans rather than hashing.
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// used callee saved regs must be tracked for pushing and popping at the beginning/end of the function.
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general_used_callee_saved_regs: MutSet<GeneralReg>,
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float_used_callee_saved_regs: MutSet<FloatReg>,
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free_stack_chunks: Vec<'a, (i32, u32)>,
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stack_size: u32,
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// The amount of extra stack space needed to pass args for function calling.
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fn_call_stack_size: u32,
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}
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pub fn new_storage_manager<
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'a,
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'r,
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GeneralReg: RegTrait,
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FloatReg: RegTrait,
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ASM: Assembler<GeneralReg, FloatReg>,
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CC: CallConv<GeneralReg, FloatReg, ASM>,
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>(
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env: &'r Env<'a>,
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target_info: TargetInfo,
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) -> StorageManager<'a, 'r, GeneralReg, FloatReg, ASM, CC> {
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StorageManager {
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phantom_asm: PhantomData,
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phantom_cc: PhantomData,
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env,
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target_info,
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symbol_storage_map: MutMap::default(),
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allocation_map: MutMap::default(),
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join_param_map: MutMap::default(),
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general_free_regs: bumpalo::vec![in env.arena],
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general_used_regs: bumpalo::vec![in env.arena],
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general_used_callee_saved_regs: MutSet::default(),
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float_free_regs: bumpalo::vec![in env.arena],
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float_used_regs: bumpalo::vec![in env.arena],
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float_used_callee_saved_regs: MutSet::default(),
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free_stack_chunks: bumpalo::vec![in env.arena],
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stack_size: 0,
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fn_call_stack_size: 0,
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}
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}
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impl<
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'a,
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'r,
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FloatReg: RegTrait,
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GeneralReg: RegTrait,
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ASM: Assembler<GeneralReg, FloatReg>,
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CC: CallConv<GeneralReg, FloatReg, ASM>,
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> StorageManager<'a, 'r, GeneralReg, FloatReg, ASM, CC>
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{
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pub fn reset(&mut self) {
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self.symbol_storage_map.clear();
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self.allocation_map.clear();
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self.join_param_map.clear();
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self.general_used_callee_saved_regs.clear();
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self.general_free_regs.clear();
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self.general_used_regs.clear();
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self.general_free_regs
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.extend_from_slice(CC::GENERAL_DEFAULT_FREE_REGS);
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self.float_used_callee_saved_regs.clear();
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self.float_free_regs.clear();
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self.float_used_regs.clear();
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self.float_free_regs
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.extend_from_slice(CC::FLOAT_DEFAULT_FREE_REGS);
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self.free_stack_chunks.clear();
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self.stack_size = 0;
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self.fn_call_stack_size = 0;
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}
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pub fn stack_size(&self) -> u32 {
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self.stack_size
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}
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pub fn fn_call_stack_size(&self) -> u32 {
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self.fn_call_stack_size
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}
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pub fn general_used_callee_saved_regs(&self) -> Vec<'a, GeneralReg> {
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let mut used_regs = bumpalo::vec![in self.env.arena];
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used_regs.extend(&self.general_used_callee_saved_regs);
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used_regs
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}
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pub fn float_used_callee_saved_regs(&self) -> Vec<'a, FloatReg> {
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let mut used_regs = bumpalo::vec![in self.env.arena];
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used_regs.extend(&self.float_used_callee_saved_regs);
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used_regs
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}
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/// Returns true if the symbol is storing a primitive value.
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pub fn is_stored_primitive(&self, sym: &Symbol) -> bool {
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matches!(
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self.get_storage_for_sym(sym),
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Reg(_) | Stack(Primitive { .. } | ReferencedPrimitive { .. })
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)
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}
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/// Get a general register from the free list.
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/// Will free data to the stack if necessary to get the register.
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fn get_general_reg(&mut self, buf: &mut Vec<'a, u8>) -> GeneralReg {
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if let Some(reg) = self.general_free_regs.pop() {
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if CC::general_callee_saved(®) {
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self.general_used_callee_saved_regs.insert(reg);
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}
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reg
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} else if !self.general_used_regs.is_empty() {
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let (reg, sym) = self.general_used_regs.remove(0);
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self.free_to_stack(buf, &sym, General(reg));
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reg
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} else {
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internal_error!("completely out of general purpose registers");
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}
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}
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/// Get a float register from the free list.
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/// Will free data to the stack if necessary to get the register.
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fn get_float_reg(&mut self, buf: &mut Vec<'a, u8>) -> FloatReg {
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if let Some(reg) = self.float_free_regs.pop() {
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if CC::float_callee_saved(®) {
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self.float_used_callee_saved_regs.insert(reg);
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}
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reg
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} else if !self.float_used_regs.is_empty() {
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let (reg, sym) = self.float_used_regs.remove(0);
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self.free_to_stack(buf, &sym, Float(reg));
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reg
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} else {
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internal_error!("completely out of general purpose registers");
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}
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}
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/// Claims a general reg for a specific symbol.
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/// They symbol should not already have storage.
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pub fn claim_general_reg(&mut self, buf: &mut Vec<'a, u8>, sym: &Symbol) -> GeneralReg {
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debug_assert_eq!(
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self.symbol_storage_map.get(sym),
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None,
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"Symbol {sym:?} is already in the storage map!"
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);
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let reg = self.get_general_reg(buf);
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self.general_used_regs.push((reg, *sym));
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self.symbol_storage_map.insert(*sym, Reg(General(reg)));
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reg
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}
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/// Claims a float reg for a specific symbol.
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/// They symbol should not already have storage.
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pub fn claim_float_reg(&mut self, buf: &mut Vec<'a, u8>, sym: &Symbol) -> FloatReg {
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debug_assert_eq!(self.symbol_storage_map.get(sym), None);
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let reg = self.get_float_reg(buf);
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self.float_used_regs.push((reg, *sym));
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self.symbol_storage_map.insert(*sym, Reg(Float(reg)));
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reg
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}
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/// This claims a temporary general register and enables is used in the passed in function.
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/// Temporary registers are not safe across call instructions.
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pub fn with_tmp_general_reg<F: FnOnce(&mut Self, &mut Vec<'a, u8>, GeneralReg)>(
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&mut self,
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buf: &mut Vec<'a, u8>,
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callback: F,
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) {
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let reg = self.get_general_reg(buf);
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callback(self, buf, reg);
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self.general_free_regs.push(reg);
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}
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#[allow(dead_code)]
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/// This claims a temporary float register and enables is used in the passed in function.
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/// Temporary registers are not safe across call instructions.
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pub fn with_tmp_float_reg<F: FnOnce(&mut Self, &mut Vec<'a, u8>, FloatReg)>(
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&mut self,
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buf: &mut Vec<'a, u8>,
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callback: F,
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) {
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let reg = self.get_float_reg(buf);
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callback(self, buf, reg);
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self.float_free_regs.push(reg);
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}
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/// Loads a symbol into a general reg and returns that register.
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/// The symbol must already be stored somewhere.
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/// Will fail on values stored in float regs.
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/// Will fail for values that don't fit in a single register.
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pub fn load_to_general_reg(&mut self, buf: &mut Vec<'a, u8>, sym: &Symbol) -> GeneralReg {
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let storage = self.remove_storage_for_sym(sym);
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match storage {
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Reg(General(reg))
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| Stack(Primitive {
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reg: Some(General(reg)),
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..
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}) => {
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self.symbol_storage_map.insert(*sym, storage);
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reg
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}
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Reg(Float(_))
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| Stack(Primitive {
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reg: Some(Float(_)),
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..
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}) => {
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internal_error!("Cannot load floating point symbol into GeneralReg: {sym:?}")
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}
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Stack(Primitive {
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reg: None,
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base_offset,
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}) => {
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debug_assert_eq!(base_offset % 8, 0);
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let reg = self.get_general_reg(buf);
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ASM::mov_reg64_base32(buf, reg, base_offset);
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self.general_used_regs.push((reg, *sym));
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self.symbol_storage_map.insert(
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*sym,
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Stack(Primitive {
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base_offset,
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reg: Some(General(reg)),
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}),
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);
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reg
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}
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Stack(ReferencedPrimitive {
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base_offset,
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size,
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sign_extend,
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}) => {
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let reg = self.get_general_reg(buf);
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if sign_extend {
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ASM::movsx_reg64_base32(buf, reg, base_offset, size as u8);
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} else {
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ASM::movzx_reg64_base32(buf, reg, base_offset, size as u8);
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}
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self.general_used_regs.push((reg, *sym));
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self.symbol_storage_map.insert(*sym, Reg(General(reg)));
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self.free_reference(sym);
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reg
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}
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Stack(Complex { size, .. }) => {
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internal_error!(
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"Cannot load large values (size {size}) into general registers: {sym:?}",
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)
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}
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NoData => {
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internal_error!("Cannot load no data into general registers: {}", sym)
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}
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}
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}
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/// Loads a symbol into a float reg and returns that register.
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/// The symbol must already be stored somewhere.
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/// Will fail on values stored in general regs.
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/// Will fail for values that don't fit in a single register.
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pub fn load_to_float_reg(&mut self, buf: &mut Vec<'a, u8>, sym: &Symbol) -> FloatReg {
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let storage = self.remove_storage_for_sym(sym);
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match storage {
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Reg(Float(reg))
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| Stack(Primitive {
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reg: Some(Float(reg)),
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..
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}) => {
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self.symbol_storage_map.insert(*sym, storage);
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reg
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}
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Reg(General(_))
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| Stack(Primitive {
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reg: Some(General(_)),
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|
..
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}) => {
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internal_error!("Cannot load general symbol into FloatReg: {}", sym)
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}
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Stack(Primitive {
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reg: None,
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base_offset,
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}) => {
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debug_assert_eq!(base_offset % 8, 0);
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let reg = self.get_float_reg(buf);
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ASM::mov_freg64_base32(buf, reg, base_offset);
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self.float_used_regs.push((reg, *sym));
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self.symbol_storage_map.insert(
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*sym,
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Stack(Primitive {
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base_offset,
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reg: Some(Float(reg)),
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}),
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);
|
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reg
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}
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Stack(ReferencedPrimitive {
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base_offset, size, ..
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}) if base_offset % 8 == 0 && size == 8 => {
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// The primitive is aligned and the data is exactly 8 bytes, treat it like regular stack.
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let reg = self.get_float_reg(buf);
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ASM::mov_freg64_base32(buf, reg, base_offset);
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self.float_used_regs.push((reg, *sym));
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self.symbol_storage_map.insert(*sym, Reg(Float(reg)));
|
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self.free_reference(sym);
|
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reg
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|
}
|
|
Stack(ReferencedPrimitive { .. }) => {
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todo!("loading referenced primitives")
|
|
}
|
|
Stack(Complex { .. }) => {
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internal_error!("Cannot load large values into float registers: {}", sym)
|
|
}
|
|
NoData => {
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internal_error!("Cannot load no data into general registers: {}", sym)
|
|
}
|
|
}
|
|
}
|
|
|
|
/// Loads the symbol to the specified register.
|
|
/// It will fail if the symbol is stored in a float register.
|
|
/// This is only made to be used in special cases where exact regs are needed (function args and returns).
|
|
/// It will not try to free the register first.
|
|
/// This will not track the symbol change (it makes no assumptions about the new reg).
|
|
pub fn load_to_specified_general_reg(
|
|
&self,
|
|
buf: &mut Vec<'a, u8>,
|
|
sym: &Symbol,
|
|
reg: GeneralReg,
|
|
) {
|
|
match self.get_storage_for_sym(sym) {
|
|
Reg(General(old_reg))
|
|
| Stack(Primitive {
|
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reg: Some(General(old_reg)),
|
|
..
|
|
}) => {
|
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if *old_reg == reg {
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return;
|
|
}
|
|
ASM::mov_reg64_reg64(buf, reg, *old_reg);
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|
}
|
|
Reg(Float(_))
|
|
| Stack(Primitive {
|
|
reg: Some(Float(_)),
|
|
..
|
|
}) => {
|
|
internal_error!("Cannot load floating point symbol into GeneralReg: {sym:?}",)
|
|
}
|
|
Stack(Primitive {
|
|
reg: None,
|
|
base_offset,
|
|
}) => {
|
|
debug_assert_eq!(base_offset % 8, 0);
|
|
ASM::mov_reg64_base32(buf, reg, *base_offset);
|
|
}
|
|
Stack(ReferencedPrimitive {
|
|
base_offset,
|
|
size,
|
|
sign_extend,
|
|
}) => {
|
|
debug_assert!(*size <= 8);
|
|
|
|
if *sign_extend {
|
|
ASM::movsx_reg64_base32(buf, reg, *base_offset, *size as u8)
|
|
} else {
|
|
ASM::movzx_reg64_base32(buf, reg, *base_offset, *size as u8)
|
|
}
|
|
}
|
|
Stack(Complex { size, .. }) => {
|
|
internal_error!(
|
|
"Cannot load large values (size {size}) into general registers: {sym:?}",
|
|
)
|
|
}
|
|
NoData => {
|
|
internal_error!("Cannot load no data into general registers: {:?}", sym)
|
|
}
|
|
}
|
|
}
|
|
|
|
/// Loads the symbol to the specified register.
|
|
/// It will fail if the symbol is stored in a general register.
|
|
/// This is only made to be used in special cases where exact regs are needed (function args and returns).
|
|
/// It will not try to free the register first.
|
|
/// This will not track the symbol change (it makes no assumptions about the new reg).
|
|
pub fn load_to_specified_float_reg(&self, buf: &mut Vec<'a, u8>, sym: &Symbol, reg: FloatReg) {
|
|
match self.get_storage_for_sym(sym) {
|
|
Reg(Float(old_reg))
|
|
| Stack(Primitive {
|
|
reg: Some(Float(old_reg)),
|
|
..
|
|
}) => {
|
|
if *old_reg == reg {
|
|
return;
|
|
}
|
|
ASM::mov_freg64_freg64(buf, reg, *old_reg);
|
|
}
|
|
Reg(General(_))
|
|
| Stack(Primitive {
|
|
reg: Some(General(_)),
|
|
..
|
|
}) => {
|
|
internal_error!("Cannot load general symbol into FloatReg: {}", sym)
|
|
}
|
|
Stack(Primitive {
|
|
reg: None,
|
|
base_offset,
|
|
}) => {
|
|
debug_assert_eq!(base_offset % 8, 0);
|
|
ASM::mov_freg64_base32(buf, reg, *base_offset);
|
|
}
|
|
Stack(ReferencedPrimitive {
|
|
base_offset, size, ..
|
|
}) if base_offset % 8 == 0 && *size == 8 => {
|
|
// The primitive is aligned and the data is exactly 8 bytes, treat it like regular stack.
|
|
ASM::mov_freg64_base32(buf, reg, *base_offset);
|
|
}
|
|
Stack(ReferencedPrimitive { .. }) => {
|
|
todo!("loading referenced primitives")
|
|
}
|
|
Stack(Complex { .. }) => {
|
|
internal_error!("Cannot load large values into float registers: {}", sym)
|
|
}
|
|
NoData => {
|
|
internal_error!("Cannot load no data into general registers: {}", sym)
|
|
}
|
|
}
|
|
}
|
|
|
|
/// Loads a field from a struct or tag union.
|
|
/// This is lazy by default. It will not copy anything around.
|
|
pub fn load_field_at_index(
|
|
&mut self,
|
|
layout_interner: &mut STLayoutInterner<'a>,
|
|
sym: &Symbol,
|
|
structure: &Symbol,
|
|
index: u64,
|
|
field_layouts: &'a [InLayout<'a>],
|
|
) {
|
|
debug_assert!(index < field_layouts.len() as u64);
|
|
|
|
let storage = *self.get_storage_for_sym(structure);
|
|
|
|
if let NoData = storage {
|
|
return self.no_data(sym);
|
|
}
|
|
|
|
// This must be removed and reinserted for ownership and mutability reasons.
|
|
let owned_data = self.remove_allocation_for_sym(structure);
|
|
self.allocation_map
|
|
.insert(*structure, Rc::clone(&owned_data));
|
|
|
|
match storage {
|
|
Stack(Complex { base_offset, size }) => {
|
|
let mut data_offset = base_offset;
|
|
for layout in field_layouts.iter().take(index as usize) {
|
|
let field_size = layout_interner.stack_size(*layout);
|
|
data_offset += field_size as i32;
|
|
}
|
|
|
|
// check that the record completely contains the field
|
|
debug_assert!(data_offset <= base_offset + size as i32,);
|
|
|
|
let layout = field_layouts[index as usize];
|
|
let size = layout_interner.stack_size(layout);
|
|
self.allocation_map.insert(*sym, owned_data);
|
|
self.symbol_storage_map.insert(
|
|
*sym,
|
|
Stack(if is_primitive(layout_interner, layout) {
|
|
ReferencedPrimitive {
|
|
base_offset: data_offset,
|
|
size,
|
|
sign_extend: matches!(layout, sign_extended_int_builtins!()),
|
|
}
|
|
} else {
|
|
Complex {
|
|
base_offset: data_offset,
|
|
size,
|
|
}
|
|
}),
|
|
);
|
|
}
|
|
storage => {
|
|
internal_error!(
|
|
"Cannot load field from data with storage type: {:?}",
|
|
storage
|
|
);
|
|
}
|
|
}
|
|
}
|
|
|
|
pub fn load_union_tag_id(
|
|
&mut self,
|
|
layout_interner: &mut STLayoutInterner<'a>,
|
|
_buf: &mut Vec<'a, u8>,
|
|
sym: &Symbol,
|
|
structure: &Symbol,
|
|
union_layout: &UnionLayout<'a>,
|
|
) {
|
|
// This must be removed and reinserted for ownership and mutability reasons.
|
|
let owned_data = self.remove_allocation_for_sym(structure);
|
|
self.allocation_map
|
|
.insert(*structure, Rc::clone(&owned_data));
|
|
match union_layout {
|
|
UnionLayout::NonRecursive(_) => {
|
|
let (union_offset, _) = self.stack_offset_and_size(structure);
|
|
|
|
let (data_size, data_alignment) =
|
|
union_layout.data_size_and_alignment(layout_interner, self.target_info);
|
|
let id_offset = data_size - data_alignment;
|
|
let discriminant = union_layout.discriminant();
|
|
|
|
let size = discriminant.stack_size();
|
|
self.allocation_map.insert(*sym, owned_data);
|
|
self.symbol_storage_map.insert(
|
|
*sym,
|
|
Stack(ReferencedPrimitive {
|
|
base_offset: union_offset + id_offset as i32,
|
|
size,
|
|
sign_extend: false, // tag ids are always unsigned
|
|
}),
|
|
);
|
|
}
|
|
x => todo!("getting tag id of union with layout ({:?})", x),
|
|
}
|
|
}
|
|
|
|
// Loads the dst to be the later 64 bits of a list (its length).
|
|
pub fn list_len(&mut self, _buf: &mut Vec<'a, u8>, dst: &Symbol, list: &Symbol) {
|
|
let owned_data = self.remove_allocation_for_sym(list);
|
|
self.allocation_map.insert(*list, Rc::clone(&owned_data));
|
|
self.allocation_map.insert(*dst, owned_data);
|
|
let (list_offset, _) = self.stack_offset_and_size(list);
|
|
self.symbol_storage_map.insert(
|
|
*dst,
|
|
Stack(ReferencedPrimitive {
|
|
base_offset: list_offset + 8,
|
|
size: 8,
|
|
sign_extend: false,
|
|
}),
|
|
);
|
|
}
|
|
|
|
/// Creates a struct on the stack, moving the data in fields into the struct.
|
|
pub fn create_struct(
|
|
&mut self,
|
|
layout_interner: &mut STLayoutInterner<'a>,
|
|
buf: &mut Vec<'a, u8>,
|
|
sym: &Symbol,
|
|
layout: &InLayout<'a>,
|
|
fields: &'a [Symbol],
|
|
) {
|
|
let struct_size = layout_interner.stack_size(*layout);
|
|
if struct_size == 0 {
|
|
self.symbol_storage_map.insert(*sym, NoData);
|
|
return;
|
|
}
|
|
let base_offset = self.claim_stack_area(sym, struct_size);
|
|
|
|
let mut in_layout = *layout;
|
|
let layout = loop {
|
|
match layout_interner.get(in_layout).repr {
|
|
LayoutRepr::LambdaSet(inner) => in_layout = inner.runtime_representation(),
|
|
other => break other,
|
|
}
|
|
};
|
|
|
|
if let LayoutRepr::Struct { field_layouts, .. } = layout {
|
|
let mut current_offset = base_offset;
|
|
for (field, field_layout) in fields.iter().zip(field_layouts.iter()) {
|
|
self.copy_symbol_to_stack_offset(
|
|
layout_interner,
|
|
buf,
|
|
current_offset,
|
|
field,
|
|
field_layout,
|
|
);
|
|
let field_size = layout_interner.stack_size(*field_layout);
|
|
current_offset += field_size as i32;
|
|
}
|
|
} else {
|
|
// This is a single element struct. Just copy the single field to the stack.
|
|
debug_assert_eq!(fields.len(), 1);
|
|
self.copy_symbol_to_stack_offset(
|
|
layout_interner,
|
|
buf,
|
|
base_offset,
|
|
&fields[0],
|
|
&in_layout,
|
|
);
|
|
}
|
|
}
|
|
|
|
/// Creates a union on the stack, moving the data in fields into the union and tagging it.
|
|
pub fn create_union(
|
|
&mut self,
|
|
layout_interner: &mut STLayoutInterner<'a>,
|
|
buf: &mut Vec<'a, u8>,
|
|
sym: &Symbol,
|
|
union_layout: &UnionLayout<'a>,
|
|
fields: &'a [Symbol],
|
|
tag_id: TagIdIntType,
|
|
) {
|
|
match union_layout {
|
|
UnionLayout::NonRecursive(field_layouts) => {
|
|
let (data_size, data_alignment) =
|
|
union_layout.data_size_and_alignment(layout_interner, self.target_info);
|
|
let id_offset = data_size - data_alignment;
|
|
let base_offset = self.claim_stack_area(sym, data_size);
|
|
let mut current_offset = base_offset;
|
|
|
|
let it = fields.iter().zip(field_layouts[tag_id as usize].iter());
|
|
for (field, field_layout) in it {
|
|
self.copy_symbol_to_stack_offset(
|
|
layout_interner,
|
|
buf,
|
|
current_offset,
|
|
field,
|
|
field_layout,
|
|
);
|
|
let field_size = layout_interner.stack_size(*field_layout);
|
|
current_offset += field_size as i32;
|
|
}
|
|
|
|
// put the tag id in the right place
|
|
self.with_tmp_general_reg(buf, |_symbol_storage, buf, reg| {
|
|
ASM::mov_reg64_imm64(buf, reg, tag_id as i64);
|
|
|
|
let total_id_offset = base_offset as u32 + id_offset;
|
|
debug_assert!(total_id_offset % data_alignment == 0);
|
|
|
|
// pick the right instruction based on the alignment of the tag id
|
|
if field_layouts.len() <= u8::MAX as _ {
|
|
ASM::mov_base32_reg8(buf, total_id_offset as i32, reg);
|
|
} else {
|
|
ASM::mov_base32_reg16(buf, total_id_offset as i32, reg);
|
|
}
|
|
});
|
|
}
|
|
x => todo!("creating unions with layout: {:?}", x),
|
|
}
|
|
}
|
|
|
|
/// Copies a complex symbol on the stack to the arg pointer.
|
|
pub fn copy_symbol_to_arg_pointer(
|
|
&mut self,
|
|
buf: &mut Vec<'a, u8>,
|
|
sym: &Symbol,
|
|
_layout: &InLayout<'a>,
|
|
) {
|
|
let ret_reg = self.load_to_general_reg(buf, &Symbol::RET_POINTER);
|
|
let (base_offset, size) = self.stack_offset_and_size(sym);
|
|
debug_assert!(base_offset % 8 == 0);
|
|
debug_assert!(size % 8 == 0);
|
|
self.with_tmp_general_reg(buf, |_storage_manager, buf, tmp_reg| {
|
|
for i in (0..size as i32).step_by(8) {
|
|
ASM::mov_reg64_base32(buf, tmp_reg, base_offset + i);
|
|
ASM::mov_mem64_offset32_reg64(buf, ret_reg, i, tmp_reg);
|
|
}
|
|
});
|
|
}
|
|
|
|
/// Copies a symbol to the specified stack offset. This is used for things like filling structs.
|
|
/// The offset is not guarenteed to be perfectly aligned, it follows Roc's alignment plan.
|
|
/// This means that, for example 2 I32s might be back to back on the stack.
|
|
/// Always interact with the stack using aligned 64bit movement.
|
|
pub fn copy_symbol_to_stack_offset(
|
|
&mut self,
|
|
layout_interner: &mut STLayoutInterner<'a>,
|
|
buf: &mut Vec<'a, u8>,
|
|
to_offset: i32,
|
|
sym: &Symbol,
|
|
layout: &InLayout<'a>,
|
|
) {
|
|
match layout_interner.get(*layout).repr {
|
|
LayoutRepr::Builtin(builtin) => match builtin {
|
|
Builtin::Int(int_width) => match int_width {
|
|
IntWidth::I128 | IntWidth::U128 => {
|
|
let (from_offset, size) = self.stack_offset_and_size(sym);
|
|
debug_assert_eq!(from_offset % 8, 0);
|
|
debug_assert_eq!(size % 8, 0);
|
|
debug_assert_eq!(size, layout_interner.stack_size(*layout));
|
|
self.copy_to_stack_offset(buf, size, from_offset, to_offset)
|
|
}
|
|
IntWidth::I64 | IntWidth::U64 => {
|
|
debug_assert_eq!(to_offset % 8, 0);
|
|
let reg = self.load_to_general_reg(buf, sym);
|
|
ASM::mov_base32_reg64(buf, to_offset, reg);
|
|
}
|
|
IntWidth::I32 | IntWidth::U32 => {
|
|
debug_assert_eq!(to_offset % 4, 0);
|
|
let reg = self.load_to_general_reg(buf, sym);
|
|
ASM::mov_base32_reg32(buf, to_offset, reg);
|
|
}
|
|
IntWidth::I16 | IntWidth::U16 => {
|
|
debug_assert_eq!(to_offset % 2, 0);
|
|
let reg = self.load_to_general_reg(buf, sym);
|
|
ASM::mov_base32_reg16(buf, to_offset, reg);
|
|
}
|
|
IntWidth::I8 | IntWidth::U8 => {
|
|
let reg = self.load_to_general_reg(buf, sym);
|
|
ASM::mov_base32_reg8(buf, to_offset, reg);
|
|
}
|
|
},
|
|
|
|
Builtin::Float(float_width) => match float_width {
|
|
FloatWidth::F64 => {
|
|
debug_assert_eq!(to_offset % 8, 0);
|
|
let reg = self.load_to_float_reg(buf, sym);
|
|
ASM::mov_base32_freg64(buf, to_offset, reg);
|
|
}
|
|
FloatWidth::F32 => todo!(),
|
|
},
|
|
Builtin::Bool => {
|
|
// same as 8-bit integer, but we special-case true/false because these symbols
|
|
// are thunks and literal values
|
|
match *sym {
|
|
Symbol::BOOL_FALSE => {
|
|
let reg = self.claim_general_reg(buf, sym);
|
|
ASM::mov_reg64_imm64(buf, reg, false as i64)
|
|
}
|
|
Symbol::BOOL_TRUE => {
|
|
let reg = self.claim_general_reg(buf, sym);
|
|
ASM::mov_reg64_imm64(buf, reg, true as i64)
|
|
}
|
|
_ => {
|
|
let reg = self.load_to_general_reg(buf, sym);
|
|
ASM::mov_base32_reg8(buf, to_offset, reg);
|
|
}
|
|
}
|
|
}
|
|
Builtin::Decimal => todo!(),
|
|
Builtin::Str | Builtin::List(_) => {
|
|
let (from_offset, size) = self.stack_offset_and_size(sym);
|
|
debug_assert_eq!(size, layout_interner.stack_size(*layout));
|
|
self.copy_to_stack_offset(buf, size, from_offset, to_offset)
|
|
}
|
|
},
|
|
LayoutRepr::Boxed(_) => {
|
|
// like a 64-bit integer
|
|
debug_assert_eq!(to_offset % 8, 0);
|
|
let reg = self.load_to_general_reg(buf, sym);
|
|
ASM::mov_base32_reg64(buf, to_offset, reg);
|
|
}
|
|
LayoutRepr::LambdaSet(lambda_set) => {
|
|
// like its runtime representation
|
|
self.copy_symbol_to_stack_offset(
|
|
layout_interner,
|
|
buf,
|
|
to_offset,
|
|
sym,
|
|
&lambda_set.runtime_representation(),
|
|
)
|
|
}
|
|
_ if layout_interner.stack_size(*layout) == 0 => {}
|
|
LayoutRepr::Struct { .. } | LayoutRepr::Union(UnionLayout::NonRecursive(_)) => {
|
|
let (from_offset, size) = self.stack_offset_and_size(sym);
|
|
debug_assert_eq!(size, layout_interner.stack_size(*layout));
|
|
|
|
self.copy_to_stack_offset(buf, size, from_offset, to_offset)
|
|
}
|
|
x => todo!("copying data to the stack with layout, {:?}", x),
|
|
}
|
|
}
|
|
|
|
pub fn copy_to_stack_offset(
|
|
&mut self,
|
|
buf: &mut Vec<'a, u8>,
|
|
size: u32,
|
|
from_offset: i32,
|
|
to_offset: i32,
|
|
) {
|
|
let mut copied = 0;
|
|
let size = size as i32;
|
|
|
|
self.with_tmp_general_reg(buf, |_storage_manager, buf, reg| {
|
|
// on targets beside x86, misaligned copies might be a problem
|
|
for _ in 0..size % 8 {
|
|
ASM::mov_reg8_base32(buf, reg, from_offset + copied);
|
|
ASM::mov_base32_reg8(buf, to_offset + copied, reg);
|
|
|
|
copied += 1;
|
|
}
|
|
|
|
if size - copied >= 8 {
|
|
for _ in (0..(size - copied)).step_by(8) {
|
|
ASM::mov_reg64_base32(buf, reg, from_offset + copied);
|
|
ASM::mov_base32_reg64(buf, to_offset + copied, reg);
|
|
|
|
copied += 8;
|
|
}
|
|
}
|
|
|
|
if size - copied >= 4 {
|
|
for _ in (0..(size - copied)).step_by(4) {
|
|
ASM::mov_reg32_base32(buf, reg, from_offset + copied);
|
|
ASM::mov_base32_reg32(buf, to_offset + copied, reg);
|
|
|
|
copied += 4;
|
|
}
|
|
}
|
|
|
|
if size - copied >= 2 {
|
|
for _ in (0..(size - copied)).step_by(2) {
|
|
ASM::mov_reg16_base32(buf, reg, from_offset + copied);
|
|
ASM::mov_base32_reg16(buf, to_offset + copied, reg);
|
|
|
|
copied += 2;
|
|
}
|
|
}
|
|
|
|
if size - copied >= 1 {
|
|
for _ in (0..(size - copied)).step_by(1) {
|
|
ASM::mov_reg8_base32(buf, reg, from_offset + copied);
|
|
ASM::mov_base32_reg8(buf, to_offset + copied, reg);
|
|
|
|
copied += 1;
|
|
}
|
|
}
|
|
});
|
|
}
|
|
|
|
#[allow(dead_code)]
|
|
/// Ensures that a register is free. If it is not free, data will be moved to make it free.
|
|
pub fn ensure_reg_free(
|
|
&mut self,
|
|
buf: &mut Vec<'a, u8>,
|
|
wanted_reg: RegStorage<GeneralReg, FloatReg>,
|
|
) {
|
|
match wanted_reg {
|
|
General(reg) => {
|
|
if self.general_free_regs.contains(®) {
|
|
return;
|
|
}
|
|
match self
|
|
.general_used_regs
|
|
.iter()
|
|
.position(|(used_reg, _sym)| reg == *used_reg)
|
|
{
|
|
Some(position) => {
|
|
let (used_reg, sym) = self.general_used_regs.remove(position);
|
|
self.free_to_stack(buf, &sym, wanted_reg);
|
|
self.general_free_regs.push(used_reg);
|
|
}
|
|
None => {
|
|
internal_error!("wanted register ({:?}) is not used or free", wanted_reg);
|
|
}
|
|
}
|
|
}
|
|
Float(reg) => {
|
|
if self.float_free_regs.contains(®) {
|
|
return;
|
|
}
|
|
match self
|
|
.float_used_regs
|
|
.iter()
|
|
.position(|(used_reg, _sym)| reg == *used_reg)
|
|
{
|
|
Some(position) => {
|
|
let (used_reg, sym) = self.float_used_regs.remove(position);
|
|
self.free_to_stack(buf, &sym, wanted_reg);
|
|
self.float_free_regs.push(used_reg);
|
|
}
|
|
None => {
|
|
internal_error!("wanted register ({:?}) is not used or free", wanted_reg);
|
|
}
|
|
}
|
|
}
|
|
}
|
|
}
|
|
|
|
pub fn ensure_symbol_on_stack(&mut self, buf: &mut Vec<'a, u8>, sym: &Symbol) {
|
|
match self.remove_storage_for_sym(sym) {
|
|
Reg(reg_storage) => {
|
|
let base_offset = self.claim_stack_size(8);
|
|
match reg_storage {
|
|
General(reg) => ASM::mov_base32_reg64(buf, base_offset, reg),
|
|
Float(reg) => ASM::mov_base32_freg64(buf, base_offset, reg),
|
|
}
|
|
self.symbol_storage_map.insert(
|
|
*sym,
|
|
Stack(Primitive {
|
|
base_offset,
|
|
reg: Some(reg_storage),
|
|
}),
|
|
);
|
|
}
|
|
x => {
|
|
self.symbol_storage_map.insert(*sym, x);
|
|
}
|
|
}
|
|
}
|
|
|
|
/// Frees all symbols to the stack setuping up a clean slate.
|
|
pub fn free_all_to_stack(&mut self, buf: &mut Vec<'a, u8>) {
|
|
let mut free_list = bumpalo::vec![in self.env.arena];
|
|
for (sym, storage) in self.symbol_storage_map.iter() {
|
|
match storage {
|
|
Reg(reg_storage)
|
|
| Stack(Primitive {
|
|
reg: Some(reg_storage),
|
|
..
|
|
}) => {
|
|
free_list.push((*sym, *reg_storage));
|
|
}
|
|
_ => {}
|
|
}
|
|
}
|
|
for (sym, reg_storage) in free_list {
|
|
match reg_storage {
|
|
General(reg) => {
|
|
self.general_free_regs.push(reg);
|
|
self.general_used_regs.retain(|(r, _)| *r != reg);
|
|
}
|
|
Float(reg) => {
|
|
self.float_free_regs.push(reg);
|
|
self.float_used_regs.retain(|(r, _)| *r != reg);
|
|
}
|
|
}
|
|
self.free_to_stack(buf, &sym, reg_storage);
|
|
}
|
|
}
|
|
|
|
/// Frees `wanted_reg` which is currently owned by `sym` by making sure the value is loaded on the stack.
|
|
/// Note, used and free regs are expected to be updated outside of this function.
|
|
fn free_to_stack(
|
|
&mut self,
|
|
buf: &mut Vec<'a, u8>,
|
|
sym: &Symbol,
|
|
wanted_reg: RegStorage<GeneralReg, FloatReg>,
|
|
) {
|
|
match self.remove_storage_for_sym(sym) {
|
|
Reg(reg_storage) => {
|
|
debug_assert_eq!(reg_storage, wanted_reg);
|
|
let base_offset = self.claim_stack_size(8);
|
|
match reg_storage {
|
|
General(reg) => ASM::mov_base32_reg64(buf, base_offset, reg),
|
|
Float(reg) => ASM::mov_base32_freg64(buf, base_offset, reg),
|
|
}
|
|
self.symbol_storage_map.insert(
|
|
*sym,
|
|
Stack(Primitive {
|
|
base_offset,
|
|
reg: None,
|
|
}),
|
|
);
|
|
}
|
|
Stack(Primitive {
|
|
reg: Some(reg_storage),
|
|
base_offset,
|
|
}) => {
|
|
debug_assert_eq!(reg_storage, wanted_reg);
|
|
self.symbol_storage_map.insert(
|
|
*sym,
|
|
Stack(Primitive {
|
|
base_offset,
|
|
reg: None,
|
|
}),
|
|
);
|
|
}
|
|
NoData
|
|
| Stack(Complex { .. } | Primitive { reg: None, .. } | ReferencedPrimitive { .. }) => {
|
|
internal_error!("Cannot free reg from symbol without a reg: {}", sym)
|
|
}
|
|
}
|
|
}
|
|
|
|
/// gets the stack offset and size of the specified symbol.
|
|
/// the symbol must already be stored on the stack.
|
|
pub fn stack_offset_and_size(&self, sym: &Symbol) -> (i32, u32) {
|
|
match self.get_storage_for_sym(sym) {
|
|
Stack(Primitive { base_offset, .. }) => (*base_offset, 8),
|
|
Stack(
|
|
ReferencedPrimitive {
|
|
base_offset, size, ..
|
|
}
|
|
| Complex { base_offset, size },
|
|
) => (*base_offset, *size),
|
|
NoData => (0, 0),
|
|
storage => {
|
|
internal_error!(
|
|
"Data not on the stack for sym {:?} with storage {:?}",
|
|
sym,
|
|
storage
|
|
)
|
|
}
|
|
}
|
|
}
|
|
|
|
/// Specifies a symbol is loaded at the specified general register.
|
|
pub fn general_reg_arg(&mut self, sym: &Symbol, reg: GeneralReg) {
|
|
self.symbol_storage_map.insert(*sym, Reg(General(reg)));
|
|
self.general_free_regs.retain(|r| *r != reg);
|
|
self.general_used_regs.push((reg, *sym));
|
|
}
|
|
|
|
/// Specifies a symbol is loaded at the specified float register.
|
|
pub fn float_reg_arg(&mut self, sym: &Symbol, reg: FloatReg) {
|
|
self.symbol_storage_map.insert(*sym, Reg(Float(reg)));
|
|
self.float_free_regs.retain(|r| *r != reg);
|
|
self.float_used_regs.push((reg, *sym));
|
|
}
|
|
|
|
/// Specifies a primitive is loaded at the specific base offset.
|
|
pub fn primitive_stack_arg(&mut self, sym: &Symbol, base_offset: i32) {
|
|
self.symbol_storage_map.insert(
|
|
*sym,
|
|
Stack(Primitive {
|
|
base_offset,
|
|
reg: None,
|
|
}),
|
|
);
|
|
self.allocation_map.insert(*sym, Rc::new((base_offset, 8)));
|
|
}
|
|
|
|
/// Specifies a complex is loaded at the specific base offset.
|
|
pub fn complex_stack_arg(&mut self, sym: &Symbol, base_offset: i32, size: u32) {
|
|
self.symbol_storage_map
|
|
.insert(*sym, Stack(Complex { base_offset, size }));
|
|
self.allocation_map
|
|
.insert(*sym, Rc::new((base_offset, size)));
|
|
}
|
|
|
|
/// Specifies a no data exists.
|
|
pub fn no_data(&mut self, sym: &Symbol) {
|
|
self.symbol_storage_map.insert(*sym, NoData);
|
|
}
|
|
|
|
/// Loads the arg pointer symbol to the specified general reg.
|
|
pub fn ret_pointer_arg(&mut self, reg: GeneralReg) {
|
|
self.symbol_storage_map
|
|
.insert(Symbol::RET_POINTER, Reg(General(reg)));
|
|
self.general_free_regs.retain(|x| *x != reg);
|
|
self.general_used_regs.push((reg, Symbol::RET_POINTER));
|
|
}
|
|
|
|
/// updates the stack size to the max of its current value and the tmp size needed.
|
|
pub fn update_stack_size(&mut self, tmp_size: u32) {
|
|
self.stack_size = max(self.stack_size, tmp_size);
|
|
}
|
|
|
|
/// updates the function call stack size to the max of its current value and the size need for this call.
|
|
pub fn update_fn_call_stack_size(&mut self, tmp_size: u32) {
|
|
self.fn_call_stack_size = max(self.fn_call_stack_size, tmp_size);
|
|
}
|
|
|
|
fn joinpoint_argument_stack_storage(
|
|
&mut self,
|
|
layout_interner: &mut STLayoutInterner<'a>,
|
|
symbol: Symbol,
|
|
layout: InLayout<'a>,
|
|
) {
|
|
match layout_interner.get(layout).repr {
|
|
single_register_layouts!() => {
|
|
let base_offset = self.claim_stack_size(8);
|
|
self.symbol_storage_map.insert(
|
|
symbol,
|
|
Stack(Primitive {
|
|
base_offset,
|
|
reg: None,
|
|
}),
|
|
);
|
|
self.allocation_map
|
|
.insert(symbol, Rc::new((base_offset, 8)));
|
|
}
|
|
_ => {
|
|
if let LayoutRepr::LambdaSet(lambda_set) = layout_interner.get(layout).repr {
|
|
self.joinpoint_argument_stack_storage(
|
|
layout_interner,
|
|
symbol,
|
|
lambda_set.runtime_representation(),
|
|
)
|
|
} else {
|
|
let stack_size = layout_interner.stack_size(layout);
|
|
if stack_size == 0 {
|
|
self.no_data(&symbol);
|
|
} else {
|
|
self.claim_stack_area(&symbol, stack_size);
|
|
}
|
|
}
|
|
}
|
|
}
|
|
}
|
|
|
|
/// Setups a join point.
|
|
/// To do this, each of the join pionts params are given a storage location.
|
|
/// Then those locations are stored.
|
|
/// Later jumps to the join point can overwrite the stored locations to pass parameters.
|
|
pub fn setup_joinpoint(
|
|
&mut self,
|
|
layout_interner: &mut STLayoutInterner<'a>,
|
|
_buf: &mut Vec<'a, u8>,
|
|
id: &JoinPointId,
|
|
params: &'a [Param<'a>],
|
|
) {
|
|
let mut param_storage = bumpalo::vec![in self.env.arena];
|
|
param_storage.reserve(params.len());
|
|
for Param {
|
|
symbol,
|
|
ownership: _,
|
|
layout,
|
|
} in params
|
|
{
|
|
// Claim a location for every join point parameter to be loaded at.
|
|
// Put everything on the stack for simplicity.
|
|
self.joinpoint_argument_stack_storage(layout_interner, *symbol, *layout);
|
|
|
|
param_storage.push(*self.get_storage_for_sym(symbol));
|
|
}
|
|
self.join_param_map.insert(*id, param_storage);
|
|
}
|
|
|
|
fn jump_argument_stack_storage(
|
|
&mut self,
|
|
layout_interner: &mut STLayoutInterner<'a>,
|
|
buf: &mut Vec<'a, u8>,
|
|
symbol: Symbol,
|
|
layout: InLayout<'a>,
|
|
base_offset: i32,
|
|
) {
|
|
match layout_interner.get(layout).repr {
|
|
single_register_integers!() => {
|
|
let reg = self.load_to_general_reg(buf, &symbol);
|
|
ASM::mov_base32_reg64(buf, base_offset, reg);
|
|
}
|
|
single_register_floats!() => {
|
|
let reg = self.load_to_float_reg(buf, &symbol);
|
|
ASM::mov_base32_freg64(buf, base_offset, reg);
|
|
}
|
|
_ => {
|
|
if let LayoutRepr::LambdaSet(lambda_set) = layout_interner.get(layout).repr {
|
|
self.jump_argument_stack_storage(
|
|
layout_interner,
|
|
buf,
|
|
symbol,
|
|
lambda_set.runtime_representation(),
|
|
base_offset,
|
|
);
|
|
} else {
|
|
internal_error!(
|
|
r"cannot load non-primitive layout ({:?}) to primitive stack location",
|
|
layout
|
|
)
|
|
}
|
|
}
|
|
}
|
|
}
|
|
|
|
/// Setup jump loads the parameters for the joinpoint.
|
|
/// This enables the jump to correctly passe arguments to the joinpoint.
|
|
pub fn setup_jump(
|
|
&mut self,
|
|
layout_interner: &mut STLayoutInterner<'a>,
|
|
buf: &mut Vec<'a, u8>,
|
|
id: &JoinPointId,
|
|
args: &[Symbol],
|
|
arg_layouts: &[InLayout<'a>],
|
|
) {
|
|
// TODO: remove was use here and for current_storage to deal with borrow checker.
|
|
// See if we can do this better.
|
|
let param_storage = match self.join_param_map.remove(id) {
|
|
Some(storages) => storages,
|
|
None => internal_error!("Jump: unknown point specified to jump to: {:?}", id),
|
|
};
|
|
|
|
let it = args.iter().zip(arg_layouts).zip(param_storage.iter());
|
|
for ((sym, layout), wanted_storage) in it {
|
|
// Note: it is possible that the storage we want to move to is in use by one of the args we want to pass.
|
|
if self.get_storage_for_sym(sym) == wanted_storage {
|
|
continue;
|
|
}
|
|
match wanted_storage {
|
|
Reg(_) => {
|
|
internal_error!("Register storage is not allowed for jumping to joinpoint")
|
|
}
|
|
Stack(Complex { base_offset, .. }) => {
|
|
// TODO: This might be better not to call.
|
|
// Maybe we want a more memcpy like method to directly get called here.
|
|
// That would also be capable of asserting the size.
|
|
// Maybe copy stack to stack or something.
|
|
self.copy_symbol_to_stack_offset(
|
|
layout_interner,
|
|
buf,
|
|
*base_offset,
|
|
sym,
|
|
layout,
|
|
);
|
|
}
|
|
Stack(Primitive {
|
|
base_offset,
|
|
reg: None,
|
|
}) => {
|
|
self.jump_argument_stack_storage(
|
|
layout_interner,
|
|
buf,
|
|
*sym,
|
|
*layout,
|
|
*base_offset,
|
|
);
|
|
}
|
|
NoData => {}
|
|
Stack(Primitive { reg: Some(_), .. }) => {
|
|
internal_error!(
|
|
"primitives with register storage are not allowed for jumping to joinpoint"
|
|
)
|
|
}
|
|
Stack(ReferencedPrimitive { .. }) => {
|
|
internal_error!(
|
|
"referenced primitive stack storage is not allowed for jumping to joinpoint"
|
|
)
|
|
}
|
|
}
|
|
}
|
|
self.join_param_map.insert(*id, param_storage);
|
|
}
|
|
|
|
/// claim_stack_area is the public wrapper around claim_stack_size.
|
|
/// It also deals with updating symbol storage.
|
|
/// It returns the base offset of the stack area.
|
|
/// It should only be used for complex data and not primitives.
|
|
pub fn claim_stack_area(&mut self, sym: &Symbol, size: u32) -> i32 {
|
|
let base_offset = self.claim_stack_size(size);
|
|
self.symbol_storage_map
|
|
.insert(*sym, Stack(Complex { base_offset, size }));
|
|
self.allocation_map
|
|
.insert(*sym, Rc::new((base_offset, size)));
|
|
base_offset
|
|
}
|
|
|
|
/// claim_stack_size claims `amount` bytes from the stack alignind to 8.
|
|
/// This may be free space in the stack or result in increasing the stack size.
|
|
/// It returns base pointer relative offset of the new data.
|
|
fn claim_stack_size(&mut self, amount: u32) -> i32 {
|
|
debug_assert!(amount > 0);
|
|
// round value to 8 byte alignment.
|
|
let amount = if amount % 8 != 0 {
|
|
amount + 8 - (amount % 8)
|
|
} else {
|
|
amount
|
|
};
|
|
if let Some(fitting_chunk) = self
|
|
.free_stack_chunks
|
|
.iter()
|
|
.enumerate()
|
|
.filter(|(_, (_, size))| *size >= amount)
|
|
.min_by_key(|(_, (_, size))| size)
|
|
{
|
|
let (pos, (offset, size)) = fitting_chunk;
|
|
let (offset, size) = (*offset, *size);
|
|
if size == amount {
|
|
self.free_stack_chunks.remove(pos);
|
|
offset
|
|
} else {
|
|
let (prev_offset, prev_size) = self.free_stack_chunks[pos];
|
|
self.free_stack_chunks[pos] = (prev_offset + amount as i32, prev_size - amount);
|
|
prev_offset
|
|
}
|
|
} else if let Some(new_size) = self.stack_size.checked_add(amount) {
|
|
// Since stack size is u32, but the max offset is i32, if we pass i32 max, we have overflowed.
|
|
if new_size > i32::MAX as u32 {
|
|
internal_error!("Ran out of stack space");
|
|
} else {
|
|
self.stack_size = new_size;
|
|
-(self.stack_size as i32)
|
|
}
|
|
} else {
|
|
internal_error!("Ran out of stack space");
|
|
}
|
|
}
|
|
|
|
pub fn free_symbol(&mut self, sym: &Symbol) {
|
|
if self.join_param_map.remove(&JoinPointId(*sym)).is_some() {
|
|
// This is a join point and will not be in the storage map.
|
|
return;
|
|
}
|
|
match self.symbol_storage_map.remove(sym) {
|
|
// Free stack chunck if this is the last reference to the chunk.
|
|
Some(Stack(Primitive { base_offset, .. })) => {
|
|
self.free_stack_chunk(base_offset, 8);
|
|
}
|
|
Some(Stack(Complex { .. } | ReferencedPrimitive { .. })) => {
|
|
self.free_reference(sym);
|
|
}
|
|
_ => {}
|
|
}
|
|
for i in 0..self.general_used_regs.len() {
|
|
let (reg, saved_sym) = self.general_used_regs[i];
|
|
if saved_sym == *sym {
|
|
self.general_free_regs.push(reg);
|
|
self.general_used_regs.remove(i);
|
|
break;
|
|
}
|
|
}
|
|
for i in 0..self.float_used_regs.len() {
|
|
let (reg, saved_sym) = self.float_used_regs[i];
|
|
if saved_sym == *sym {
|
|
self.float_free_regs.push(reg);
|
|
self.float_used_regs.remove(i);
|
|
break;
|
|
}
|
|
}
|
|
}
|
|
|
|
/// Frees an reference and release an allocation if it is no longer used.
|
|
fn free_reference(&mut self, sym: &Symbol) {
|
|
let owned_data = self.remove_allocation_for_sym(sym);
|
|
if Rc::strong_count(&owned_data) == 1 {
|
|
self.free_stack_chunk(owned_data.0, owned_data.1);
|
|
}
|
|
}
|
|
|
|
fn free_stack_chunk(&mut self, base_offset: i32, size: u32) {
|
|
let loc = (base_offset, size);
|
|
// Note: this position current points to the offset following the specified location.
|
|
// If loc was inserted at this position, it would shift the data at this position over by 1.
|
|
let pos = self
|
|
.free_stack_chunks
|
|
.binary_search(&loc)
|
|
.unwrap_or_else(|e| e);
|
|
|
|
// Check for overlap with previous and next free chunk.
|
|
let merge_with_prev = if pos > 0 {
|
|
if let Some((prev_offset, prev_size)) = self.free_stack_chunks.get(pos - 1) {
|
|
let prev_end = *prev_offset + *prev_size as i32;
|
|
if prev_end > base_offset {
|
|
internal_error!("Double free? A previously freed stack location overlaps with the currently freed stack location.");
|
|
}
|
|
prev_end == base_offset
|
|
} else {
|
|
false
|
|
}
|
|
} else {
|
|
false
|
|
};
|
|
let merge_with_next = if let Some((next_offset, _)) = self.free_stack_chunks.get(pos) {
|
|
let current_end = base_offset + size as i32;
|
|
if current_end > *next_offset {
|
|
internal_error!("Double free? A previously freed stack location overlaps with the currently freed stack location.");
|
|
}
|
|
current_end == *next_offset
|
|
} else {
|
|
false
|
|
};
|
|
|
|
match (merge_with_prev, merge_with_next) {
|
|
(true, true) => {
|
|
let (prev_offset, prev_size) = self.free_stack_chunks[pos - 1];
|
|
let (_, next_size) = self.free_stack_chunks[pos];
|
|
self.free_stack_chunks[pos - 1] = (prev_offset, prev_size + size + next_size);
|
|
self.free_stack_chunks.remove(pos);
|
|
}
|
|
(true, false) => {
|
|
let (prev_offset, prev_size) = self.free_stack_chunks[pos - 1];
|
|
self.free_stack_chunks[pos - 1] = (prev_offset, prev_size + size);
|
|
}
|
|
(false, true) => {
|
|
let (_, next_size) = self.free_stack_chunks[pos];
|
|
self.free_stack_chunks[pos] = (base_offset, next_size + size);
|
|
}
|
|
(false, false) => self.free_stack_chunks.insert(pos, loc),
|
|
}
|
|
}
|
|
|
|
pub fn push_used_caller_saved_regs_to_stack(&mut self, buf: &mut Vec<'a, u8>) {
|
|
let old_general_used_regs = std::mem::replace(
|
|
&mut self.general_used_regs,
|
|
bumpalo::vec![in self.env.arena],
|
|
);
|
|
for (reg, saved_sym) in old_general_used_regs.into_iter() {
|
|
if CC::general_caller_saved(®) {
|
|
self.general_free_regs.push(reg);
|
|
self.free_to_stack(buf, &saved_sym, General(reg));
|
|
} else {
|
|
self.general_used_regs.push((reg, saved_sym));
|
|
}
|
|
}
|
|
let old_float_used_regs =
|
|
std::mem::replace(&mut self.float_used_regs, bumpalo::vec![in self.env.arena]);
|
|
for (reg, saved_sym) in old_float_used_regs.into_iter() {
|
|
if CC::float_caller_saved(®) {
|
|
self.float_free_regs.push(reg);
|
|
self.free_to_stack(buf, &saved_sym, Float(reg));
|
|
} else {
|
|
self.float_used_regs.push((reg, saved_sym));
|
|
}
|
|
}
|
|
}
|
|
|
|
#[allow(dead_code)]
|
|
/// Gets the allocated area for a symbol. The index symbol must be defined.
|
|
fn get_allocation_for_sym(&self, sym: &Symbol) -> &Rc<(i32, u32)> {
|
|
if let Some(allocation) = self.allocation_map.get(sym) {
|
|
allocation
|
|
} else {
|
|
internal_error!("Unknown symbol: {:?}", sym);
|
|
}
|
|
}
|
|
|
|
/// Removes and returns the allocated area for a symbol. They index symbol must be defined.
|
|
fn remove_allocation_for_sym(&mut self, sym: &Symbol) -> Rc<(i32, u32)> {
|
|
if let Some(allocation) = self.allocation_map.remove(sym) {
|
|
allocation
|
|
} else {
|
|
internal_error!("Unknown symbol: {:?}", sym);
|
|
}
|
|
}
|
|
|
|
/// Gets a value from storage. The index symbol must be defined.
|
|
fn get_storage_for_sym(&self, sym: &Symbol) -> &Storage<GeneralReg, FloatReg> {
|
|
if let Some(storage) = self.symbol_storage_map.get(sym) {
|
|
storage
|
|
} else {
|
|
internal_error!("Unknown symbol: {:?}", sym);
|
|
}
|
|
}
|
|
|
|
/// Removes and returns a value from storage. They index symbol must be defined.
|
|
fn remove_storage_for_sym(&mut self, sym: &Symbol) -> Storage<GeneralReg, FloatReg> {
|
|
if let Some(storage) = self.symbol_storage_map.remove(sym) {
|
|
storage
|
|
} else {
|
|
internal_error!("Unknown symbol: {:?}", sym);
|
|
}
|
|
}
|
|
}
|
|
|
|
fn is_primitive(layout_interner: &mut STLayoutInterner<'_>, layout: InLayout<'_>) -> bool {
|
|
match layout_interner.get(layout).repr {
|
|
single_register_layouts!() => true,
|
|
_ => match layout_interner.get(layout).repr {
|
|
LayoutRepr::Boxed(_) => true,
|
|
LayoutRepr::LambdaSet(lambda_set) => {
|
|
is_primitive(layout_interner, lambda_set.runtime_representation())
|
|
}
|
|
_ => false,
|
|
},
|
|
}
|
|
}
|