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2741 Commits

Author SHA1 Message Date
Andrew Kelley
e6fa2ee706
fix nested peer result locs with no memory loc 
```zig
export fn entry2(c: bool) i32 {
    return if (c)
        i32(0)
    else if (c)
        i32(1)
    else
        i32(2);
}
```

```llvm
define i32 @entry2(i1) #2 !dbg !35 {
Entry:
  %c = alloca i1, align 1
  store i1 %0, i1* %c, align 1
  call void @llvm.dbg.declare(metadata i1* %c, metadata !41, metadata !DIExpression()), !dbg !42
  %1 = load i1, i1* %c, align 1, !dbg !43
  br i1 %1, label %Then, label %Else, !dbg !43

Then:                                             ; preds = %Entry
  br label %EndIf3, !dbg !45

Else:                                             ; preds = %Entry
  %2 = load i1, i1* %c, align 1, !dbg !46
  br i1 %2, label %Then1, label %Else2, !dbg !46

Then1:                                            ; preds = %Else
  br label %EndIf, !dbg !47

Else2:                                            ; preds = %Else
  br label %EndIf, !dbg !47

EndIf:                                            ; preds = %Else2, %Then1
  %3 = phi i32 [ 1, %Then1 ], [ 2, %Else2 ], !dbg !47
  br label %EndIf3, !dbg !45

EndIf3:                                           ; preds = %EndIf, %Then
  %4 = phi i32 [ 0, %Then ], [ %3, %EndIf ], !dbg !45
  ret i32 %4, !dbg !48
}
```
 2019-06-12 18:08:56 -04:00
Andrew Kelley
1526d89711
fix @bitCast with runtime scalar and dest result loc var 2019-06-12 15:02:46 -04:00
Andrew Kelley
35352e0f48
fix alignment problem with @bitCast result location 2019-06-12 13:49:57 -04:00
Andrew Kelley
278c7a2bc3
fix @bitCast regressions 2019-06-12 13:42:21 -04:00
Andrew Kelley
ce5d50e4ed
fix runtime if nested inside comptime if 2019-06-11 18:26:01 -04:00
Andrew Kelley
b3a4ec1bd2
fix returning scalar values 
```zig
export fn entry1() i32 {
    return bar();
}
```

```llvm
define i32 @entry1() #2 !dbg !35 {
Entry:
  %0 = call fastcc i32 @bar(), !dbg !39
  ret i32 %0, !dbg !41
}
```
 2019-06-11 16:04:04 -04:00
Andrew Kelley
e1d14e73b5
fix @bitCast semantics when there is no parent result loc 2019-06-11 15:44:06 -04:00
Andrew Kelley
0ac566892d
fix for loop index variable not in scope 2019-06-11 14:15:58 -04:00
Andrew Kelley
515092210f
fix not checking return value of resolving result 2019-06-11 13:48:53 -04:00
Andrew Kelley
1c2e889820
fix struct and array init when result casted to anyerror!?T 
previous commit message is incorrect, it was only for
anyerror!T
 2019-06-11 13:44:09 -04:00
Andrew Kelley
fc8d881240
fix struct and array init when result casted to anyerror!?T 2019-06-11 13:27:01 -04:00
Andrew Kelley
06f307ff77
fix implicit casting return value struct/arary init to optional 2019-06-11 12:19:57 -04:00
Andrew Kelley
a431a73dab
fixes for crashes and compile errors 2019-06-11 01:24:55 -04:00
Andrew Kelley
b053a65573
fix comptime variables 2019-06-11 00:36:03 -04:00
Andrew Kelley
7411a88d5f
fix comptime function calls 2019-06-11 00:27:10 -04:00
Andrew Kelley
33371ab55c
Merge remote-tracking branch 'origin/master' into copy-elision-3 2019-06-11 00:09:58 -04:00
Andrew Kelley
d504318f2e
remove the final legacy stack allocation 2019-06-10 23:54:28 -04:00
Andrew Kelley
f6d4e2565e
use result loc for ref instruction 2019-06-10 23:51:43 -04:00
Andrew Kelley
a0427d29e4
fix peer result locations in the face of unreachable 
```zig
export fn entry() void {
    var nothing: ?*i32 = null;
    var whatever = if (nothing) |x1| i32(1) else unreachable;
}
```

```llvm
define void @entry() #2 !dbg !35 {
Entry:
  %nothing = alloca i32*, align 8
  %whatever = alloca i32, align 4
  store i32* null, i32** %nothing, align 8, !dbg !45
  call void @llvm.dbg.declare(metadata i32** %nothing, metadata !39, metadata !DIExpression()), !dbg !45
  %0 = load i32*, i32** %nothing, align 8, !dbg !46
  %1 = icmp ne i32* %0, null, !dbg !46
  br i1 %1, label %OptionalThen, label %OptionalElse, !dbg !46

OptionalThen:                                     ; preds = %Entry
  call void @llvm.dbg.declare(metadata i32** %nothing, metadata !43, metadata !DIExpression()), !dbg !46
  store i32 1, i32* %whatever, align 4, !dbg !47
  br label %OptionalEndIf, !dbg !46

OptionalElse:                                     ; preds = %Entry
  tail call fastcc void @panic(%"[]u8"* @1, %builtin.StackTrace* null), !dbg !48
  unreachable, !dbg !48

OptionalEndIf:                                    ; preds = %OptionalThen
  call void @llvm.dbg.declare(metadata i32* %whatever, metadata !44, metadata !DIExpression()), !dbg !49
  ret void, !dbg !50
}
```
 2019-06-10 23:25:43 -04:00
Andrew Kelley
4582ec518f
result location semantics for vector to array 
```zig
export fn entry() void {
    var x: @Vector(4, i32) = undefined;
    var y: [4]i32 = x;
}
```

```llvm
define void @entry() #2 !dbg !35 {
Entry:
  %x = alloca <4 x i32>, align 16
  %y = alloca [4 x i32], align 4
  %0 = bitcast <4 x i32>* %x to i8*, !dbg !47
  call void @llvm.memset.p0i8.i64(i8* align 16 %0, i8 -86, i64 16, i1 false), !dbg !47
  call void @llvm.dbg.declare(metadata <4 x i32>* %x, metadata !39, metadata !DIExpression()), !dbg !47
  %1 = load <4 x i32>, <4 x i32>* %x, align 16, !dbg !48
  %2 = bitcast [4 x i32]* %y to <4 x i32>*, !dbg !48
  store <4 x i32> %1, <4 x i32>* %2, align 16, !dbg !48
  call void @llvm.dbg.declare(metadata [4 x i32]* %y, metadata !45, metadata !DIExpression()), !dbg !49
  ret void, !dbg !50
}
```
 2019-06-10 19:49:24 -04:00
Andrew Kelley
9a324ecb42
result loc semantics for loading packed struct pointer to packed struct 
```zig
export fn entry() void {
    var x = foo();
    var ptr = &x.b;
    var y = ptr.*;
}
const Foo = packed struct {
    a: u24 = 1,
    b: Bar = Bar{},
};

const Bar = packed struct {
    a: u4 = 2,
    b: u4 = 3,
};
```

```llvm
define void @entry() #2 !dbg !35 {
Entry:
  %x = alloca %Foo, align 1
  %ptr = alloca i32*, align 8
  %y = alloca %Bar, align 1
  call fastcc void @foo(%Foo* sret %x), !dbg !55
  call void @llvm.dbg.declare(metadata %Foo* %x, metadata !39, metadata !DIExpression()), !dbg !56
  %0 = getelementptr inbounds %Foo, %Foo* %x, i32 0, i32 0, !dbg !57
  store i32* %0, i32** %ptr, align 8, !dbg !57
  call void @llvm.dbg.declare(metadata i32** %ptr, metadata !51, metadata !DIExpression()), !dbg !58
  %1 = load i32*, i32** %ptr, align 8, !dbg !59
  %2 = load i32, i32* %1, align 1, !dbg !60
  %3 = lshr i32 %2, 24, !dbg !60
  %4 = trunc i32 %3 to i8, !dbg !60
  %5 = bitcast %Bar* %y to i8*, !dbg !60
  store i8 %4, i8* %5, !dbg !60
  call void @llvm.dbg.declare(metadata %Bar* %y, metadata !54, metadata !DIExpression()), !dbg !61
  ret void, !dbg !62
}
```
 2019-06-10 19:11:34 -04:00
Andrew Kelley
65f6ea66f4
result loc semantics for @sliceToBytes and @bytesToSlice 2019-06-10 18:34:27 -04:00
Andrew Kelley
ee3f7e20f6
result location semantics for cmpxchg 2019-06-10 17:49:36 -04:00
Andrew Kelley
b9c033ae1a
result location semantics for error union wrapping an error 2019-06-10 17:28:25 -04:00
Andrew Kelley
4f085b8d2c
result location semantics for error union wrapping a payload 2019-06-10 16:55:07 -04:00
Andrew Kelley
eaa9d8bdac
result location semantics for optional wrap 2019-06-10 16:20:13 -04:00
Andrew Kelley
c362895116
result location semantics for slices 
```zig
export fn entry() void {
    var buf: [10]u8 = undefined;
    const slice1: []const u8 = &buf;
    const slice2 = buf[0..];
}
```

```llvm
define void @entry() #2 !dbg !35 {
Entry:
  %buf = alloca [10 x i8], align 1
  %slice1 = alloca %"[]u8", align 8
  %slice2 = alloca %"[]u8", align 8
  %0 = bitcast [10 x i8]* %buf to i8*, !dbg !46
  call void @llvm.memset.p0i8.i64(i8* align 1 %0, i8 -86, i64 10, i1 false), !dbg !46
  call void @llvm.dbg.declare(metadata [10 x i8]* %buf, metadata !39, metadata !DIExpression()), !dbg !46
  %1 = getelementptr inbounds %"[]u8", %"[]u8"* %slice1, i32 0, i32 0, !dbg !47
  %2 = getelementptr inbounds [10 x i8], [10 x i8]* %buf, i64 0, i64 0, !dbg !47
  store i8* %2, i8** %1, align 8, !dbg !47
  %3 = getelementptr inbounds %"[]u8", %"[]u8"* %slice1, i32 0, i32 1, !dbg !47
  store i64 10, i64* %3, align 8, !dbg !47
  call void @llvm.dbg.declare(metadata %"[]u8"* %slice1, metadata !44, metadata !DIExpression()), !dbg !48
  %4 = getelementptr inbounds %"[]u8", %"[]u8"* %slice2, i32 0, i32 0, !dbg !49
  %5 = getelementptr inbounds [10 x i8], [10 x i8]* %buf, i64 0, i64 0, !dbg !49
  store i8* %5, i8** %4, align 8, !dbg !49
  %6 = getelementptr inbounds %"[]u8", %"[]u8"* %slice2, i32 0, i32 1, !dbg !49
  store i64 10, i64* %6, align 8, !dbg !49
  call void @llvm.dbg.declare(metadata %"[]u8"* %slice2, metadata !45, metadata !DIExpression()), !dbg !50
  ret void, !dbg !51
}
```
 2019-06-10 15:49:45 -04:00
Andrew Kelley
17b1ac5d03
result location semantics for @bitCast 
```zig
export fn entry() void {
    var x = @bitCast(f32, foo());
}
```

```llvm
define void @entry() #2 !dbg !35 {
Entry:
  %x = alloca float, align 4
  %0 = bitcast float* %x to %Foo*, !dbg !42
  call fastcc void @foo(%Foo* sret %0), !dbg !42
  call void @llvm.dbg.declare(metadata float* %x, metadata !39, metadata !DIExpression()), !dbg !43
  ret void, !dbg !44
}
```
 2019-06-10 12:24:19 -04:00
Andrew Kelley
1a51bf6304
hook up result locations for union initializations 
```zig
export fn entry() void {
    var x = Foo{ .bar = bar() };
}
```

```llvm
define void @entry() #2 !dbg !44 {
Entry:
  %x = alloca %Foo, align 4
  %0 = getelementptr inbounds %Foo, %Foo* %x, i32 0, i32 1, !dbg !68
  store i1 true, i1* %0, align 1, !dbg !68
  %1 = getelementptr inbounds %Foo, %Foo* %x, i32 0, i32 0, !dbg !68
  %2 = bitcast { i32, [4 x i8] }* %1 to %Bar*, !dbg !68
  call fastcc void @bar(%Bar* sret %2), !dbg !68
  call void @llvm.dbg.declare(metadata %Foo* %x, metadata !48, metadata !DIExpression()), !dbg !69
  ret void, !dbg !70
}
```
 2019-06-10 11:15:32 -04:00
Andrew Kelley
b7811d3269
whitespace cleanup 2019-06-10 00:45:24 -04:00
SamTebbs33
6c160b8856 Add check for null body in if, for and while 2019-06-10 00:41:33 -04:00
Andrew Kelley
4e2b2822f1
inferred array size of array literals works 2019-06-09 19:55:15 -04:00
Andrew Kelley
3a4b749c8a
Merge remote-tracking branch 'origin/master' into copy-elision-3 2019-06-09 19:44:01 -04:00
Andrew Kelley
b735764898
different array literal syntax when inferring the size 
old syntax:  []i32{1, 2, 3}
new syntax: [_]i32{1, 2, 3}

closes #1797
 2019-06-09 19:26:32 -04:00
Andrew Kelley
59fe13772f
result loc semantics for array initialization 
```zig
export fn entry() void {
    var x = [3]Bar{ bar(), bar(), Bar{ .y = 12 } };
}
```

```llvm
define void @entry() #2 !dbg !35 {
Entry:
  %x = alloca [3 x %Bar], align 4
  %0 = getelementptr inbounds [3 x %Bar], [3 x %Bar]* %x, i64 0, i64 0, !dbg !48
  call fastcc void @bar(%Bar* sret %0), !dbg !48
  %1 = getelementptr inbounds [3 x %Bar], [3 x %Bar]* %x, i64 0, i64 1, !dbg !49
  call fastcc void @bar(%Bar* sret %1), !dbg !49
  %2 = getelementptr inbounds [3 x %Bar], [3 x %Bar]* %x, i64 0, i64 2, !dbg !50
  %3 = bitcast %Bar* %2 to i8*, !dbg !50
  call void @llvm.memcpy.p0i8.p0i8.i64(i8* align 4 %3, i8* align 4 bitcast (%Bar* @0 to i8*), i64 4, i1 false), !dbg !50
  call void @llvm.dbg.declare(metadata [3 x %Bar]* %x, metadata !39, metadata !DIExpression()), !dbg !51
  ret void, !dbg !52
}
```
 2019-06-09 12:03:15 -04:00
Andrew Kelley
3ec766abe3
remove ResultLocField dead code 2019-06-09 10:46:13 -04:00
Andrew Kelley
771e88951a
result location mechanism for struct initialization 
```zig
export fn entry() void {
    const static = Foo{
        .x = 9,
        .bar = Bar{ .y = 10 },
    };
    const runtime = foo(true);
}

fn foo(c: bool) Foo {
    return Foo{
        .x = 12,
        .bar = if (c) bar1() else bar2(),
    };
}

fn bar1() Bar {
    return Bar{ .y = 34 };
}

fn bar2() Bar {
    return Bar{ .y = 56 };
}
```

```llvm
@0 = internal unnamed_addr constant %Foo { i32 9, %Bar { i32 10 } }, align 4
@1 = internal unnamed_addr constant %Bar { i32 34 }, align 4
@2 = internal unnamed_addr constant %Bar { i32 56 }, align 4

define void @entry() #2 !dbg !35 {
Entry:
  %runtime = alloca %Foo, align 4
  call void @llvm.dbg.declare(metadata %Foo* @0, metadata !39, metadata !DIExpression()), !dbg !50
  call fastcc void @foo(%Foo* sret %runtime, i1 true), !dbg !51
  call void @llvm.dbg.declare(metadata %Foo* %runtime, metadata !49, metadata !DIExpression()), !dbg !52
  ret void, !dbg !53
}

define internal fastcc void @foo(%Foo* nonnull sret, i1) unnamed_addr #2 !dbg !54 {
Entry:
  %c = alloca i1, align 1
  store i1 %1, i1* %c, align 1
  call void @llvm.dbg.declare(metadata i1* %c, metadata !60, metadata !DIExpression()), !dbg !61
  %2 = getelementptr inbounds %Foo, %Foo* %0, i32 0, i32 0, !dbg !62
  store i32 12, i32* %2, align 4, !dbg !62
  %3 = getelementptr inbounds %Foo, %Foo* %0, i32 0, i32 1, !dbg !64
  %4 = load i1, i1* %c, align 1, !dbg !65
  br i1 %4, label %Then, label %Else, !dbg !65

Then:                                             ; preds = %Entry
  call fastcc void @bar1(%Bar* sret %3), !dbg !66
  br label %EndIf, !dbg !64

Else:                                             ; preds = %Entry
  call fastcc void @bar2(%Bar* sret %3), !dbg !67
  br label %EndIf, !dbg !64

EndIf:                                            ; preds = %Else, %Then
  ret void, !dbg !68
}

define internal fastcc void @bar1(%Bar* nonnull sret) unnamed_addr #2 !dbg !69 {
Entry:
  %1 = bitcast %Bar* %0 to i8*, !dbg !73
  call void @llvm.memcpy.p0i8.p0i8.i64(i8* align 4 %1, i8* align 4 bitcast (%Bar* @1 to i8*), i64 4, i1 false), !dbg !73
  ret void, !dbg !73
}

define internal fastcc void @bar2(%Bar* nonnull sret) unnamed_addr #2 !dbg !75 {
Entry:
  %1 = bitcast %Bar* %0 to i8*, !dbg !76
  call void @llvm.memcpy.p0i8.p0i8.i64(i8* align 4 %1, i8* align 4 bitcast (%Bar* @2 to i8*), i64 4, i1 false), !dbg !76
  ret void, !dbg !76
}

!39 = !DILocalVariable(name: "static", scope: !40, file: !5, line: 2, type: !41)
!49 = !DILocalVariable(name: "runtime", scope: !40, file: !5, line: 6, type: !41)
```
 2019-06-08 18:51:31 -04:00
Andrew Kelley
52eb347188
hook up result locs for try 2019-06-08 01:16:19 -04:00
Andrew Kelley
a2fff2628f
hook up peer result locs to orelse keyword 2019-06-08 01:09:19 -04:00
Andrew Kelley
b1efba0c70
hook up peer result locs to catch 
```zig
export fn entry() void {
    var x = crap() catch bar();
}
```

```llvm
define void @entry() #2 !dbg !40 {
Entry:
  %0 = alloca { i16, %Foo }, align 4
  %x = alloca %Foo, align 4
  call fastcc void @crap({ i16, %Foo }* sret %0), !dbg !50
  %1 = getelementptr inbounds { i16, %Foo }, { i16, %Foo }* %0, i32 0, i32 0, !dbg !51
  %2 = load i16, i16* %1, align 2, !dbg !51
  %3 = icmp ne i16 %2, 0, !dbg !51
  br i1 %3, label %UnwrapErrError, label %UnwrapErrOk, !dbg !51

UnwrapErrError:                                   ; preds = %Entry
  call fastcc void @bar(%Foo* sret %x), !dbg !52
  br label %UnwrapErrEnd, !dbg !51

UnwrapErrOk:                                      ; preds = %Entry
  %4 = getelementptr inbounds { i16, %Foo }, { i16, %Foo }* %0, i32 0, i32 1, !dbg !51
  %5 = bitcast %Foo* %4 to i8*, !dbg !51
  %6 = bitcast %Foo* %x to i8*, !dbg !51
  call void @llvm.memcpy.p0i8.p0i8.i64(i8* align 4 %6, i8* align 4 %5, i64 4, i1 false), !dbg !51
  br label %UnwrapErrEnd, !dbg !51

UnwrapErrEnd:                                     ; preds = %UnwrapErrOk, %UnwrapErrError
  ret void, !dbg !53
}
```
 2019-06-07 17:37:29 -04:00
Andrew Kelley
2b0a1b7b14
hook up result locs to for loops 
```zig
export fn entry() void {
    var buf: [10]u8 = undefined;
    var x = for (buf) |x| break foo() else bar();
}
```

```llvm
define void @entry() #2 !dbg !35 {
Entry:
  %buf = alloca [10 x i8], align 1
  %i = alloca i64, align 8
  %x = alloca %Foo, align 4
  %0 = bitcast [10 x i8]* %buf to i8*, !dbg !51
  call void @llvm.memset.p0i8.i64(i8* align 1 %0, i8 -86, i64 10, i1 false), !dbg !51
  call void @llvm.dbg.declare(metadata [10 x i8]* %buf, metadata !39, metadata !DIExpression()), !dbg !51
  store i64 0, i64* %i, align 8, !dbg !52
  call void @llvm.dbg.declare(metadata i64* %i, metadata !44, metadata !DIExpression()), !dbg !52
  br label %ForCond, !dbg !52

ForCond:                                          ; preds = %Entry
  %1 = load i64, i64* %i, align 8, !dbg !52
  %2 = icmp ult i64 %1, 10, !dbg !52
  br i1 %2, label %ForBody, label %ForElse, !dbg !52

ForBody:                                          ; preds = %ForCond
  %3 = getelementptr inbounds [10 x i8], [10 x i8]* %buf, i64 0, i64 %1, !dbg !52
  call void @llvm.dbg.declare(metadata i8* %3, metadata !45, metadata !DIExpression()), !dbg !53
  call fastcc void @foo(%Foo* sret %x), !dbg !54
  br label %ForEnd, !dbg !55

ForElse:                                          ; preds = %ForCond
  call fastcc void @bar(%Foo* sret %x), !dbg !56
  br label %ForEnd, !dbg !52

ForEnd:                                           ; preds = %ForElse, %ForBody
  call void @llvm.dbg.declare(metadata %Foo* %x, metadata !46, metadata !DIExpression()), !dbg !57
  ret void, !dbg !58
}
```
 2019-06-07 15:58:18 -04:00
Andrew Kelley
ede3436b08
hook up peer result locs to while bool and optional 2019-06-07 15:48:28 -04:00
Andrew Kelley
ec8d8a9774
hook up while on error unions with result locations 
```zig
export fn entry() void {
    var c: anyerror!i32 = 1234;
    var x = while (c) |y| break foo() else |e| bar();
}
```

```llvm
define void @entry() #2 !dbg !39 {
Entry:
  %c = alloca { i16, i32 }, align 4
  %x = alloca %Foo, align 4
  %0 = bitcast { i16, i32 }* %c to i8*, !dbg !56
  call void @llvm.memcpy.p0i8.p0i8.i64(i8* align 4 %0, i8* align 4 bitcast ({ i16, i32 }* @0 to i8*), i64 8, i1 false), !dbg !56
  call void @llvm.dbg.declare(metadata { i16, i32 }* %c, metadata !43, metadata !DIExpression()), !dbg !56
  br label %WhileCond, !dbg !57

WhileCond:                                        ; preds = %Entry
  %1 = getelementptr inbounds { i16, i32 }, { i16, i32 }* %c, i32 0, i32 0, !dbg !58
  %2 = load i16, i16* %1, align 2, !dbg !58
  %3 = icmp ne i16 %2, 0, !dbg !58
  br i1 %3, label %WhileElse, label %WhileBody, !dbg !58

WhileBody:                                        ; preds = %WhileCond
  %4 = getelementptr inbounds { i16, i32 }, { i16, i32 }* %c, i32 0, i32 1, !dbg !57
  call void @llvm.dbg.declare(metadata i32* %4, metadata !50, metadata !DIExpression()), !dbg !57
  call fastcc void @foo(%Foo* sret %x), !dbg !59
  br label %WhileEnd, !dbg !60

WhileElse:                                        ; preds = %WhileCond
  %5 = getelementptr inbounds { i16, i32 }, { i16, i32 }* %c, i32 0, i32 0, !dbg !61
  call void @llvm.dbg.declare(metadata i16* %5, metadata !51, metadata !DIExpression()), !dbg !61
  call fastcc void @bar(%Foo* sret %x), !dbg !61
  br label %WhileEnd, !dbg !57

WhileEnd:                                         ; preds = %WhileElse, %WhileBody
  call void @llvm.dbg.declare(metadata %Foo* %x, metadata !52, metadata !DIExpression()), !dbg !62
  ret void, !dbg !63
}
```
 2019-06-07 15:22:21 -04:00
Andrew Kelley
0e8b65c537
hook up peer result locs to if optional and if err 2019-06-07 14:49:26 -04:00
Andrew Kelley
ec17f4ebbe
fix behavior for peer result locs with one prong unreachable 2019-06-07 14:20:35 -04:00
Andrew Kelley
5784631fab
update the default macos version min to 10.14 2019-06-07 12:20:02 -04:00
Andrew Kelley
4c222a482f
fix behavior for non sret fn calls 2019-06-07 11:51:50 -04:00
Andrew Kelley
76a3938d69
no-copy semantics for peer result function calls 
```zig
export fn entry() void {
    var c = true;
    var x = if (c) foo() else bar();
}
```

```llvm
define void @entry() #2 !dbg !35 {
Entry:
  %c = alloca i1, align 1
  %x = alloca %Foo, align 4
  store i1 true, i1* %c, align 1, !dbg !47
  call void @llvm.dbg.declare(metadata i1* %c, metadata !39, metadata !DIExpression()), !dbg !48
  %0 = load i1, i1* %c, align 1, !dbg !49
  br i1 %0, label %Then, label %Else, !dbg !49

Then:                                             ; preds = %Entry
  call fastcc void @foo(%Foo* sret %x), !dbg !50
  br label %EndIf, !dbg !51

Else:                                             ; preds = %Entry
  call fastcc void @bar(%Foo* sret %x), !dbg !52
  br label %EndIf, !dbg !51

EndIf:                                            ; preds = %Else, %Then
  call void @llvm.dbg.declare(metadata %Foo* %x, metadata !42, metadata !DIExpression()), !dbg !53
  ret void, !dbg !54
}
```
 2019-06-07 11:34:47 -04:00
Andrew Kelley
b19b1c1298
no-copy semantics for switch expressions 
```zig
export fn entry() void {
    var c: i32 = 1234;
    var x = switch (c) {
        1 => u8(1),
        2...4 => u16(2),
        else => u32(3),
    };
}
```

```llvm
define void @entry() #2 !dbg !35 {
Entry:
  %c = alloca i32, align 4
  %x = alloca i32, align 4
  store i32 1234, i32* %c, align 4, !dbg !44
  call void @llvm.dbg.declare(metadata i32* %c, metadata !39, metadata !DIExpression()), !dbg !44
  %0 = load i32, i32* %c, align 4, !dbg !45
  %1 = icmp sge i32 %0, 2, !dbg !46
  %2 = icmp sle i32 %0, 4, !dbg !46
  %3 = and i1 %1, %2, !dbg !46
  br i1 %3, label %SwitchRangeYes, label %SwitchRangeNo, !dbg !46

SwitchRangeYes:                                   ; preds = %Entry
  br label %SwitchEnd, !dbg !45

SwitchElse:                                       ; preds = %SwitchRangeNo
  br label %SwitchEnd, !dbg !45

SwitchProng:                                      ; preds = %SwitchRangeNo
  br label %SwitchEnd, !dbg !45

SwitchEnd:                                        ; preds = %SwitchProng, %SwitchElse, %SwitchRangeYes
  %4 = phi i32 [ 2, %SwitchRangeYes ], [ 3, %SwitchElse ], [ 1, %SwitchProng ], !dbg !45
  store i32 %4, i32* %x, align 4, !dbg !45
  call void @llvm.dbg.declare(metadata i32* %x, metadata !42, metadata !DIExpression()), !dbg !47
  ret void, !dbg !48

SwitchRangeNo:                                    ; preds = %Entry
  switch i32 %0, label %SwitchElse [
    i32 1, label %SwitchProng
  ], !dbg !45
}
```
 2019-06-04 14:47:01 -04:00
Nick Erdmann
d83b15febf src/ast_render.cpp: fix rendering of character literals <= 0x0f 2019-06-04 13:00:41 -04:00