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feat(singlepass-backend) Inject FuncCtx to the function pointer of an host function.

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This commit is contained in:
Ivan Enderlin
2019-11-05 15:07:37 +01:00
parent 215e4458f0
commit a4ba429ed0
1 changed files with 12 additions and 6 deletions
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18
lib/singlepass-backend/src/codegen_x64.rs
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@ -554,18 +554,24 @@ impl ModuleCodeGenerator<X64FunctionCode, X64ExecutionContext, CodegenError>
// Emits a tail call trampoline that loads the address of the target import function
// from Ctx and jumps to it.
let imported_funcs_addr = vm::Ctx::offset_imported_funcs();
let imported_func = vm::ImportedFunc::size() as usize * id;
let imported_func_addr = imported_func + vm::ImportedFunc::offset_func() as usize;
let imported_func_ctx_addr = imported_func + vm::ImportedFunc::offset_func_ctx() as usize;
a.emit_mov(
Size::S64,
Location::Memory(GPR::RDI, vm::Ctx::offset_imported_funcs() as i32),
Location::Memory(GPR::RDI, imported_funcs_addr as i32),
Location::GPR(GPR::RAX),
);
a.emit_mov(
Size::S64,
Location::Memory(
GPR::RAX,
(vm::ImportedFunc::size() as usize * id + vm::ImportedFunc::offset_func() as usize)
as i32,
),
Location::Memory(GPR::RAX, imported_func_ctx_addr as i32),
Location::GPR(GPR::RDI),
);
a.emit_mov(
Size::S64,
Location::Memory(GPR::RAX, imported_func_addr as i32),
Location::GPR(GPR::RAX),
);
a.emit_jmp_location(Location::GPR(GPR::RAX));