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Define a "table" concept.

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"Table" is to WebAssembly tables as "Heap" is to WebAssembly linear
memories.
This commit is contained in:
Dan Gohman
2018-05-20 07:48:46 -07:00
parent cd75176f10
commit 1b30265c5c
23 changed files with 500 additions and 16 deletions
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31
lib/wasm/src/environ/dummy.rs
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@@ -1,6 +1,7 @@
//! "Dummy" environment for testing wasm translation.
use cranelift_codegen::cursor::FuncCursor;
use cranelift_codegen::ir::immediates::Imm64;
use cranelift_codegen::ir::types::*;
use cranelift_codegen::ir::{self, InstBuilder};
use cranelift_codegen::settings;
@@ -169,7 +170,11 @@ impl<'dummy_environment> FuncEnvironment for DummyFuncEnvironment<'dummy_environ
fn make_heap(&mut self, func: &mut ir::Function, _index: MemoryIndex) -> ir::Heap {
// Create a static heap whose base address is stored at `vmctx+0`.
let gv = func.create_global_value(ir::GlobalValueData::VMContext { offset: 0.into() });
let addr = func.create_global_value(ir::GlobalValueData::VMContext { offset: 0.into() });
let gv = func.create_global_value(ir::GlobalValueData::Deref {
base: addr,
offset: 0.into(),
});
func.create_heap(ir::HeapData {
base: gv,
@@ -181,6 +186,29 @@ impl<'dummy_environment> FuncEnvironment for DummyFuncEnvironment<'dummy_environ
})
}
fn make_table(&mut self, func: &mut ir::Function, _index: TableIndex) -> ir::Table {
// Create a table whose base address is stored at `vmctx+0`.
let base_gv_addr =
func.create_global_value(ir::GlobalValueData::VMContext { offset: 0.into() });
let base_gv = func.create_global_value(ir::GlobalValueData::Deref {
base: base_gv_addr,
offset: 0.into(),
});
let bound_gv_addr =
func.create_global_value(ir::GlobalValueData::VMContext { offset: 0.into() });
let bound_gv = func.create_global_value(ir::GlobalValueData::Deref {
base: bound_gv_addr,
offset: 0.into(),
});
func.create_table(ir::TableData {
base_gv,
min_size: Imm64::new(0),
bound_gv,
element_size: Imm64::new(i64::from(self.pointer_bytes()) * 2),
})
}
fn make_indirect_sig(&mut self, func: &mut ir::Function, index: SignatureIndex) -> ir::SigRef {
// A real implementation would probably change the calling convention and add `vmctx` and
// signature index arguments.
@@ -204,6 +232,7 @@ impl<'dummy_environment> FuncEnvironment for DummyFuncEnvironment<'dummy_environ
&mut self,
mut pos: FuncCursor,
_table_index: TableIndex,
_table: ir::Table,
_sig_index: SignatureIndex,
sig_ref: ir::SigRef,
callee: ir::Value,