Allow cross-module indirect calls.

lib/dynasm-backend/src/codegen_x64.rs

@@ -83,7 +83,9 @@ lazy_static! {
             ; push r14
             ; push r13
             ; push r12
-            ; sub rsp, 8 // align to 16 bytes
+            ; push r11
+            ; push rbp
+            ; mov rbp, rsp
 
             ; mov r15, rdi
             ; mov r14, rsi
@@ -95,34 +97,56 @@ lazy_static! {
             ; sub r14, 8
             ; cmp r14, r15
             ; jb >stack_ready
+
             ; mov rsi, [r14]
-
             ; sub r14, 8
             ; cmp r14, r15
             ; jb >stack_ready
+
             ; mov rdx, [r14]
-
             ; sub r14, 8
             ; cmp r14, r15
             ; jb >stack_ready
+
             ; mov rcx, [r14]
-
             ; sub r14, 8
             ; cmp r14, r15
             ; jb >stack_ready
+
             ; mov r8, [r14]
-
             ; sub r14, 8
             ; cmp r14, r15
             ; jb >stack_ready
-            ; mov r9, [r14]
 
-            ; ud2 // FIXME
+            ; mov r9, [r14]
+            ; sub r14, 8
+            ; cmp r14, r15
+            ; jb >stack_ready
+
+            ; mov rax, r14
+            ; sub rax, r15
+            ; sub rsp, rax
+            ; sub rsp, 8
+            ; mov rax, QWORD 0xfffffffffffffff0u64 as i64
+            ; and rsp, rax
+            ; mov rax, rsp
+            ; loop_begin:
+            ; mov r11, [r14]
+            ; mov [rax], r11
+            ; sub r14, 8
+            ; add rax, 8
+            ; cmp r14, r15
+            ; jb >stack_ready
+            ; jmp <loop_begin
 
             ; stack_ready:
+            ; mov rax, QWORD 0xfffffffffffffff0u64 as i64
+            ; and rsp, rax
             ; call r12
 
-            ; add rsp, 8
+            ; mov rsp, rbp
+            ; pop rbp
+            ; pop r11
             ; pop r12
             ; pop r13
             ; pop r14
@@ -4939,32 +4963,19 @@ unsafe extern "C" fn call_indirect(
         protect_unix::trigger_trap();
     }
     let anyfunc = &*(table.base as *mut vm::Anyfunc).offset(elem_index as isize);
-    let ctx: &X64ExecutionContext =
-        &*CURRENT_EXECUTION_CONTEXT.with(|x| *x.borrow().last().unwrap());
+    let dynamic_sigindex = *(*vmctx).dynamic_sigindices.offset(sig_index as isize);
 
-    let func_index = match anyfunc.func_index {
-        Some(x) => x,
-        None => {
-            eprintln!("empty table entry");
+    if anyfunc.func.is_null() {
+        eprintln!("null anyfunc");
         protect_unix::trigger_trap();
     }
-    };
 
-    if ctx.signatures[SigIndex::new(sig_index)]
-        != ctx.signatures[ctx.function_signatures[func_index]]
-    {
+    if anyfunc.sig_id.0 != dynamic_sigindex.0 {
         eprintln!("signature mismatch");
         protect_unix::trigger_trap();
     }
 
-    let func = ctx.function_pointers[func_index.index() as usize].0;
-    CALL_WASM(
-        stack_top,
-        stack_base as usize - stack_top as usize,
-        func as _,
-        memory_base,
-        vmctx,
-    ) as u64
+    CONSTRUCT_STACK_AND_CALL_NATIVE(stack_top, stack_base, anyfunc.ctx, anyfunc.func)
 }
 
 #[repr(u64)]

lib/dynasm-backend/src/lib.rs

@@ -46,16 +46,6 @@ impl CacheGen for Placeholder {
     }
 }
 
-impl FuncResolver for Placeholder {
-    fn get(
-        &self,
-        _module: &ModuleInner,
-        _local_func_index: LocalFuncIndex,
-    ) -> Option<NonNull<vm::Func>> {
-        NonNull::new(0x3f3f3f3f3f3f3f3fusize as *mut vm::Func)
-    }
-}
-
 pub struct SinglePassCompiler {}
 impl SinglePassCompiler {
     pub fn new() -> Self {

lib/runtime-core/src/backing.rs

@@ -234,7 +234,6 @@ impl LocalBacking {
                                 func,
                                 ctx,
                                 sig_id,
-                                func_index: Some(func_index),
                             };
                         }
                     });
@@ -278,7 +277,6 @@ impl LocalBacking {
                                 func,
                                 ctx,
                                 sig_id,
-                                func_index: Some(func_index),
                             };
                         }
                     });

lib/runtime-core/src/table/anyfunc.rs

@@ -107,7 +107,6 @@ impl AnyfuncTable {
                         func: ptr,
                         ctx: ptr::null_mut(),
                         sig_id,
-                        func_index: None,
                     }
                 }
                 AnyfuncInner::Managed(ref func) => {
@@ -118,7 +117,6 @@ impl AnyfuncTable {
                         func: func.raw(),
                         ctx: func.instance_inner.vmctx,
                         sig_id,
-                        func_index: Some(func.func_index),
                     }
                 }
             };

lib/runtime-core/src/vm.rs

@@ -38,7 +38,7 @@ pub struct Ctx {
     /// from a static, module-local signature id to a runtime-global
     /// signature id. This is used to allow call-indirect to other
     /// modules safely.
-    pub(crate) dynamic_sigindices: *const SigId,
+    pub dynamic_sigindices: *const SigId,
 
     pub(crate) local_functions: *const *const Func,
 
@@ -302,7 +302,6 @@ pub struct Anyfunc {
     pub func: *const Func,
     pub ctx: *mut Ctx,
     pub sig_id: SigId,
-    pub func_index: Option<FuncIndex>,
 }
 
 impl Anyfunc {
@@ -311,7 +310,6 @@ impl Anyfunc {
             func: ptr::null(),
             ctx: ptr::null_mut(),
             sig_id: SigId(u32::max_value()),
-            func_index: None,
         }
     }