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Reimplement table_prepare for new vmctx.

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This commit is contained in:
Nick Lewycky
2020-05-11 16:06:02 -07:00
parent 3a1c3beb89
commit fce8dacc10
1 changed files with 64 additions and 67 deletions
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131
lib/compiler-llvm/src/translator/intrinsics.rs
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@@ -890,7 +890,7 @@ impl<'ctx, 'a> CtxType<'ctx, 'a> {
pub fn table_prepare(
&mut self,
index: TableIndex,
table_index: TableIndex,
intrinsics: &Intrinsics<'ctx>,
module: &Module<'ctx>,
) -> (PointerValue<'ctx>, PointerValue<'ctx>) {
@@ -904,74 +904,71 @@ impl<'ctx, 'a> CtxType<'ctx, 'a> {
let TableCache {
ptr_to_base_ptr,
ptr_to_bounds,
} = *cached_tables.entry(index).or_insert_with(|| {
let (table_array_ptr_ptr, index, field_name) =
if let Some(local_table_index) = wasm_module.local_table_index(index) {
(
unsafe {
cache_builder
.build_struct_gep(
ctx_ptr_value,
offset_to_index(offsets.vmctx_tables_begin()),
"table_array_ptr_ptr",
)
.unwrap()
},
local_table_index.index() as u64,
"context_field_ptr_to_local_table",
)
} = *cached_tables.entry(table_index).or_insert_with(|| {
let (ptr_to_base_ptr, ptr_to_bounds) =
if let Some(local_table_index) = wasm_module.local_table_index(table_index) {
let offset = intrinsics.i64_ty.const_int(
offsets
.vmctx_vmtable_definition_base(local_table_index)
.into(),
false,
);
let ptr_to_base_ptr =
unsafe { cache_builder.build_gep(ctx_ptr_value, &[offset], "") };
let ptr_to_base_ptr = cache_builder
.build_bitcast(
ptr_to_base_ptr,
intrinsics.i8_ptr_ty.ptr_type(AddressSpace::Generic),
"",
)
.into_pointer_value();
let offset = intrinsics.i64_ty.const_int(
offsets
.vmctx_vmtable_definition_current_elements(local_table_index)
.into(),
false,
);
let ptr_to_bounds =
unsafe { cache_builder.build_gep(ctx_ptr_value, &[offset], "") };
(ptr_to_base_ptr, ptr_to_bounds)
} else {
(
unsafe {
cache_builder
.build_struct_gep(
ctx_ptr_value,
offset_to_index(offsets.vmctx_imported_tables_begin()),
"table_array_ptr_ptr",
)
.unwrap()
},
index.index() as u64,
"context_field_ptr_to_import_table",
)
let offset = intrinsics.i64_ty.const_int(
offsets.vmctx_vmtable_import_definition(table_index).into(),
false,
);
let definition_ptr_ptr =
unsafe { cache_builder.build_gep(ctx_ptr_value, &[offset], "") };
let definition_ptr_ptr = cache_builder
.build_bitcast(
definition_ptr_ptr,
intrinsics.i8_ptr_ty.ptr_type(AddressSpace::Generic),
"",
)
.into_pointer_value();
let definition_ptr = cache_builder
.build_load(definition_ptr_ptr, "")
.into_pointer_value();
// TODO: TBAA label
let offset = intrinsics
.i64_ty
.const_int(offsets.vmtable_definition_base().into(), false);
let ptr_to_base_ptr =
unsafe { cache_builder.build_gep(definition_ptr, &[offset], "") };
let ptr_to_base_ptr = cache_builder
.build_bitcast(
ptr_to_base_ptr,
intrinsics.i8_ptr_ty.ptr_type(AddressSpace::Generic),
"",
)
.into_pointer_value();
let offset = intrinsics
.i64_ty
.const_int(offsets.vmtable_definition_current_elements().into(), false);
let ptr_to_bounds =
unsafe { cache_builder.build_gep(definition_ptr, &[offset], "") };
(ptr_to_base_ptr, ptr_to_bounds)
};
let table_array_ptr = cache_builder
.build_load(table_array_ptr_ptr, "table_array_ptr")
.into_pointer_value();
tbaa_label(
module,
intrinsics,
field_name,
table_array_ptr.as_instruction_value().unwrap(),
None,
);
let const_index = intrinsics.i32_ty.const_int(index, false);
let table_ptr_ptr = unsafe {
cache_builder.build_in_bounds_gep(table_array_ptr, &[const_index], "table_ptr_ptr")
};
let table_ptr = cache_builder
.build_load(table_ptr_ptr, "table_ptr")
.into_pointer_value();
tbaa_label(
module,
intrinsics,
"table_ptr",
table_array_ptr.as_instruction_value().unwrap(),
Some(index as u32),
);
let (ptr_to_base_ptr, ptr_to_bounds) = unsafe {
(
cache_builder
.build_struct_gep(table_ptr, 0, "base_ptr")
.unwrap(),
cache_builder
.build_struct_gep(table_ptr, 1, "bounds_ptr")
.unwrap(),
)
};
TableCache {
ptr_to_base_ptr,
ptr_to_bounds,