mirror/zig
1
0
Fork 0
mirror of https://github.com/ziglang/zig.git synced 2026-02-12 20:37:54 +00:00
Code Issues Packages Projects Releases Wiki Activity

no-copy semantics for function call init var and literal

Browse Source 
```zig
export fn entry() void {
    var x = foo();
}
const Foo = struct {
    x: i32,
};
fn foo() Foo {
    return Foo{
        .x = 1234,
    };
}
```

```llvm
define void @entry() #2 !dbg !35 {
Entry:
  %x = alloca %Foo, align 4
  call fastcc void @foo(%Foo* sret %x), !dbg !45
  call void @llvm.dbg.declare(metadata %Foo* %x, metadata !39, metadata !DIExpression()), !dbg !46
  ret void, !dbg !47
}
define internal fastcc void @foo(%Foo* nonnull sret) unnamed_addr #2 !dbg !48 {
Entry:
  %1 = bitcast %Foo* %0 to i8*, !dbg !52
  call void @llvm.memcpy.p0i8.p0i8.i64(i8* align 4 %1, i8* align 4 bitcast (%Foo* @0 to i8*), i64 4, i1 false), !dbg !52
  ret void, !dbg !52
}
```
This commit is contained in:
Andrew Kelley 2019-05-31 01:08:16 -04:00
parent 8aba0643a5
commit 461382ae94
No known key found for this signature in database
GPG Key ID: 7C5F548F728501A9
1 changed files with 6 additions and 3 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

9
src/ir.cpp
View File

@ -14365,11 +14365,11 @@ static IrInstruction *ir_resolve_result(IrAnalyze *ira, ResultLoc *result_loc, Z
assert(result_loc->source_instruction->id == IrInstructionIdAllocaSrc);
IrInstructionAllocaSrc *alloca_src =
reinterpret_cast<IrInstructionAllocaSrc *>(result_loc->source_instruction);
bool is_comptime = value != nullptr && value->value.special != ConstValSpecialRuntime &&
result_loc_var->var->gen_is_const;
if (alloca_src->base.child == nullptr) {
uint32_t align = 0; // TODO
bool force_comptime = false; // TODO
bool is_comptime = value != nullptr && value->value.special != ConstValSpecialRuntime &&
result_loc_var->var->gen_is_const;
IrInstruction *alloca_gen;
if (is_comptime) {
alloca_gen = ir_get_ref(ira, result_loc->source_instruction, value, true, false);
@ -14378,10 +14378,13 @@ static IrInstruction *ir_resolve_result(IrAnalyze *ira, ResultLoc *result_loc, Z
alloca_src->name_hint, force_comptime);
}
alloca_src->base.child = alloca_gen;
return is_comptime ? nullptr : alloca_src->base.child;
}
return is_comptime ? nullptr : alloca_src->base.child;
return nullptr;
}
case ResultLocIdReturn: {
bool is_comptime = value != nullptr && value->value.special != ConstValSpecialRuntime;
if (is_comptime) return nullptr;
ZigType *ptr_return_type = get_pointer_to_type(ira->codegen, ira->explicit_return_type, false);
return ir_build_return_ptr(ira, result_loc->source_instruction, ptr_return_type);
}