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improve list allocation

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This commit is contained in:
Folkert 2020-11-19 16:11:21 +01:00
parent b61f5d02b9
commit 45c62dfa3c
2 changed files with 11 additions and 48 deletions
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57
compiler/gen/src/llvm/build_list.rs
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@ -1,6 +1,9 @@
use crate::llvm::build::{build_num_binop, Env, InPlace};
use crate::llvm::build::{
allocate_with_refcount_help, build_num_binop, cast_basic_basic, Env, InPlace,
};
use crate::llvm::compare::build_eq;
use crate::llvm::convert::{basic_type_from_layout, collection, get_ptr_type, ptr_int};
use crate::llvm::refcounting::PointerToRefcount;
use inkwell::builder::Builder;
use inkwell::context::Context;
use inkwell::types::{BasicTypeEnum, PointerType};
@ -1894,53 +1897,13 @@ pub fn allocate_list<'a, 'ctx, 'env>(
let builder = env.builder;
let ctx = env.context;
let elem_type = basic_type_from_layout(env.arena, ctx, elem_layout, env.ptr_bytes);
let elem_bytes = elem_layout.stack_size(env.ptr_bytes) as u64;
let len_type = env.ptr_int();
// bytes per element
let bytes_len = len_type.const_int(elem_bytes, false);
let offset = (env.ptr_bytes as u64).max(elem_bytes);
let elem_bytes = elem_layout.stack_size(env.ptr_bytes) as u64;
let bytes_per_element = len_type.const_int(elem_bytes, false);
let ptr = {
let len = builder.build_int_mul(bytes_len, length, "data_length");
let len =
builder.build_int_add(len, len_type.const_int(offset, false), "add_refcount_space");
let number_of_data_bytes = builder.build_int_mul(bytes_per_element, length, "data_length");
env.builder
.build_array_malloc(ctx.i8_type(), len, "create_list_ptr")
.unwrap()
// TODO check if malloc returned null; if so, runtime error for OOM!
};
// We must return a pointer to the first element:
let ptr_bytes = env.ptr_bytes;
let int_type = ptr_int(ctx, ptr_bytes);
let ptr_as_int = builder.build_ptr_to_int(ptr, int_type, "list_cast_ptr");
let incremented = builder.build_int_add(
ptr_as_int,
ctx.i64_type().const_int(offset, false),
"increment_list_ptr",
);
let ptr_type = get_ptr_type(&elem_type, AddressSpace::Generic);
let list_element_ptr = builder.build_int_to_ptr(incremented, ptr_type, "list_cast_ptr");
// subtract ptr_size, to access the refcount
let refcount_ptr = builder.build_int_sub(
incremented,
ctx.i64_type().const_int(env.ptr_bytes as u64, false),
"refcount_ptr",
);
let refcount_ptr = builder.build_int_to_ptr(
refcount_ptr,
int_type.ptr_type(AddressSpace::Generic),
"make ptr",
);
let ref_count_one = match inplace {
let rc1 = match inplace {
InPlace::InPlace => length,
InPlace::Clone => {
// the refcount of a new list is initially 1
@ -1949,9 +1912,7 @@ pub fn allocate_list<'a, 'ctx, 'env>(
}
};
builder.build_store(refcount_ptr, ref_count_one);
list_element_ptr
allocate_with_refcount_help(env, elem_layout, number_of_data_bytes, rc1)
}
pub fn store_list<'a, 'ctx, 'env>(