mirror of
https://github.com/carbon-language/carbon-lang.git
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Add an interface for initialization of vars without an explicit initializer (#6934)
When a `var` is not explicitly given an initializer, initialize it in one of two ways: * If its type implements the new interface `Core.Default`, call `Core.Default.Op` to initialize it. * Otherwise, if its type implements `UnformedInit`, leave it in an unformed state. For now, this is always an uninitialized state, but that will change in the future. * If neither of those apply, the `var` declaration is ill-formed. This is a step towards implementing leads decision #6739 and proposals #257 and #5913. Assisted-by: Gemini 3.1 Pro via Antigravity --------- Co-authored-by: Geoff Romer <gromer@google.com>
This commit is contained in:
Richard Smith
co-authored by
Geoff Romer
Geoff Romer
parent
fd2d210c63
commit
ce50f181f1
+103
-113
@@ -39,10 +39,7 @@ fn F[T:! Core.Copy & Core.Destroy](x: T*) {
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B(x);
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}
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fn M() {
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var ptr_i32 : i32*;
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var ptr_f64 : f64*;
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fn M(ptr_i32: i32*, ptr_f64: f64*) {
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F(ptr_i32);
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F(ptr_f64);
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}
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@@ -53,81 +50,75 @@ fn M() {
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// CHECK:STDOUT: %type = type {}
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// CHECK:STDOUT:
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// CHECK:STDOUT: ; Function Attrs: nounwind
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// CHECK:STDOUT: define void @_CM.Main() #0 !dbg !4 {
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// CHECK:STDOUT: define void @_CM.Main(ptr %ptr_i32, ptr %ptr_f64) #0 !dbg !4 {
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// CHECK:STDOUT: entry:
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// CHECK:STDOUT: %ptr_i32.var = alloca ptr, align 8, !dbg !7
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// CHECK:STDOUT: %ptr_f64.var = alloca ptr, align 8, !dbg !8
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// CHECK:STDOUT: call void @llvm.lifetime.start.p0(ptr %ptr_i32.var), !dbg !7
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// CHECK:STDOUT: call void @llvm.lifetime.start.p0(ptr %ptr_f64.var), !dbg !8
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// CHECK:STDOUT: %.loc46_5 = load ptr, ptr %ptr_i32.var, align 8, !dbg !9
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// CHECK:STDOUT: call void @_CF.Main.bfb441135f07cbe1(ptr %.loc46_5), !dbg !10
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// CHECK:STDOUT: %.loc47_5 = load ptr, ptr %ptr_f64.var, align 8, !dbg !11
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// CHECK:STDOUT: call void @_CF.Main.29cf1dfeccef7249(ptr %.loc47_5), !dbg !12
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// CHECK:STDOUT: call void @_CF.Main.bfb441135f07cbe1(ptr %ptr_i32), !dbg !11
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// CHECK:STDOUT: call void @_CF.Main.29cf1dfeccef7249(ptr %ptr_f64), !dbg !12
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// CHECK:STDOUT: ret void, !dbg !13
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// CHECK:STDOUT: }
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// CHECK:STDOUT:
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// CHECK:STDOUT: ; Function Attrs: nounwind
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// CHECK:STDOUT: define linkonce_odr void @_CF.Main.bfb441135f07cbe1(ptr %x) #0 !dbg !14 {
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// CHECK:STDOUT: entry:
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// CHECK:STDOUT: %A.call = call %type @_CA.Main.582d60b54baf6b63(%type zeroinitializer), !dbg !19
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// CHECK:STDOUT: call void @_CB.Main.bfb441135f07cbe1(ptr %x), !dbg !20
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// CHECK:STDOUT: ret void, !dbg !21
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// CHECK:STDOUT: }
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// CHECK:STDOUT:
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// CHECK:STDOUT: ; Function Attrs: nounwind
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// CHECK:STDOUT: define linkonce_odr void @_CF.Main.29cf1dfeccef7249(ptr %x) #0 !dbg !22 {
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// CHECK:STDOUT: entry:
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// CHECK:STDOUT: %A.call = call %type @_CA.Main.582d60b54baf6b63(%type zeroinitializer), !dbg !25
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// CHECK:STDOUT: call void @_CB.Main.29cf1dfeccef7249(ptr %x), !dbg !26
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// CHECK:STDOUT: ret void, !dbg !27
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// CHECK:STDOUT: }
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// CHECK:STDOUT:
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// CHECK:STDOUT: ; Function Attrs: nounwind
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// CHECK:STDOUT: define linkonce_odr %type @_CA.Main.582d60b54baf6b63(%type %x) #0 !dbg !28 {
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// CHECK:STDOUT: entry:
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// CHECK:STDOUT: ret %type %x, !dbg !33
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// CHECK:STDOUT: }
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// CHECK:STDOUT:
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// CHECK:STDOUT: ; Function Attrs: nounwind
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// CHECK:STDOUT: define linkonce_odr void @_CB.Main.bfb441135f07cbe1(ptr %x) #0 !dbg !34 {
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// CHECK:STDOUT: entry:
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// CHECK:STDOUT: %.loc34_7.2.temp = alloca i32, align 4, !dbg !37
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// CHECK:STDOUT: call void @llvm.lifetime.start.p0(ptr %.loc34_7.2.temp), !dbg !37
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// CHECK:STDOUT: %.loc34_5.2 = load i32, ptr %x, align 4, !dbg !38
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// CHECK:STDOUT: %D.call = call i32 @_CD.Main.64ccbb8e5d9a0b8e(i32 %.loc34_5.2), !dbg !37
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// CHECK:STDOUT: store i32 %D.call, ptr %.loc34_7.2.temp, align 4, !dbg !37
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// CHECK:STDOUT: ret void, !dbg !39
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// CHECK:STDOUT: }
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// CHECK:STDOUT:
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// CHECK:STDOUT: ; Function Attrs: nounwind
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// CHECK:STDOUT: define linkonce_odr void @_CB.Main.29cf1dfeccef7249(ptr %x) #0 !dbg !40 {
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// CHECK:STDOUT: entry:
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// CHECK:STDOUT: %.loc34_7.2.temp = alloca double, align 8, !dbg !43
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// CHECK:STDOUT: call void @llvm.lifetime.start.p0(ptr %.loc34_7.2.temp), !dbg !43
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// CHECK:STDOUT: %.loc34_5.2 = load double, ptr %x, align 8, !dbg !44
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// CHECK:STDOUT: %D.call = call double @_CD.Main.de5b400758c39a65(double %.loc34_5.2), !dbg !43
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// CHECK:STDOUT: store double %D.call, ptr %.loc34_7.2.temp, align 8, !dbg !43
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// CHECK:STDOUT: ret void, !dbg !45
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// CHECK:STDOUT: }
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// CHECK:STDOUT:
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// CHECK:STDOUT: ; Function Attrs: nocallback nofree nosync nounwind willreturn memory(argmem: readwrite)
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// CHECK:STDOUT: declare void @llvm.lifetime.start.p0(ptr captures(none)) #1
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// CHECK:STDOUT:
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// CHECK:STDOUT: ; Function Attrs: nounwind
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// CHECK:STDOUT: define linkonce_odr void @_CF.Main.bfb441135f07cbe1(ptr %x) #0 !dbg !14 {
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// CHECK:STDOUT: define linkonce_odr i32 @_CD.Main.64ccbb8e5d9a0b8e(i32 %x) #0 !dbg !46 {
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// CHECK:STDOUT: entry:
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// CHECK:STDOUT: %A.call = call %type @_CA.Main.582d60b54baf6b63(%type zeroinitializer), !dbg !20
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// CHECK:STDOUT: call void @_CB.Main.bfb441135f07cbe1(ptr %x), !dbg !21
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// CHECK:STDOUT: ret void, !dbg !22
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// CHECK:STDOUT: ret i32 %x, !dbg !52
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// CHECK:STDOUT: }
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// CHECK:STDOUT:
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// CHECK:STDOUT: ; Function Attrs: nounwind
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// CHECK:STDOUT: define linkonce_odr void @_CF.Main.29cf1dfeccef7249(ptr %x) #0 !dbg !23 {
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// CHECK:STDOUT: define linkonce_odr double @_CD.Main.de5b400758c39a65(double %x) #0 !dbg !53 {
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// CHECK:STDOUT: entry:
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// CHECK:STDOUT: %A.call = call %type @_CA.Main.582d60b54baf6b63(%type zeroinitializer), !dbg !26
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// CHECK:STDOUT: call void @_CB.Main.29cf1dfeccef7249(ptr %x), !dbg !27
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// CHECK:STDOUT: ret void, !dbg !28
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// CHECK:STDOUT: }
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// CHECK:STDOUT:
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// CHECK:STDOUT: ; Function Attrs: nounwind
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// CHECK:STDOUT: define linkonce_odr %type @_CA.Main.582d60b54baf6b63(%type %x) #0 !dbg !29 {
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// CHECK:STDOUT: entry:
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// CHECK:STDOUT: ret %type %x, !dbg !34
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// CHECK:STDOUT: }
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// CHECK:STDOUT:
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// CHECK:STDOUT: ; Function Attrs: nounwind
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// CHECK:STDOUT: define linkonce_odr void @_CB.Main.bfb441135f07cbe1(ptr %x) #0 !dbg !35 {
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// CHECK:STDOUT: entry:
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// CHECK:STDOUT: %.loc34_7.2.temp = alloca i32, align 4, !dbg !38
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// CHECK:STDOUT: call void @llvm.lifetime.start.p0(ptr %.loc34_7.2.temp), !dbg !38
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// CHECK:STDOUT: %.loc34_5.2 = load i32, ptr %x, align 4, !dbg !39
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// CHECK:STDOUT: %D.call = call i32 @_CD.Main.64ccbb8e5d9a0b8e(i32 %.loc34_5.2), !dbg !38
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// CHECK:STDOUT: store i32 %D.call, ptr %.loc34_7.2.temp, align 4, !dbg !38
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// CHECK:STDOUT: ret void, !dbg !40
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// CHECK:STDOUT: }
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// CHECK:STDOUT:
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// CHECK:STDOUT: ; Function Attrs: nounwind
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// CHECK:STDOUT: define linkonce_odr void @_CB.Main.29cf1dfeccef7249(ptr %x) #0 !dbg !41 {
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// CHECK:STDOUT: entry:
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// CHECK:STDOUT: %.loc34_7.2.temp = alloca double, align 8, !dbg !44
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// CHECK:STDOUT: call void @llvm.lifetime.start.p0(ptr %.loc34_7.2.temp), !dbg !44
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// CHECK:STDOUT: %.loc34_5.2 = load double, ptr %x, align 8, !dbg !45
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// CHECK:STDOUT: %D.call = call double @_CD.Main.de5b400758c39a65(double %.loc34_5.2), !dbg !44
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// CHECK:STDOUT: store double %D.call, ptr %.loc34_7.2.temp, align 8, !dbg !44
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// CHECK:STDOUT: ret void, !dbg !46
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// CHECK:STDOUT: }
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// CHECK:STDOUT:
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// CHECK:STDOUT: ; Function Attrs: nounwind
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// CHECK:STDOUT: define linkonce_odr i32 @_CD.Main.64ccbb8e5d9a0b8e(i32 %x) #0 !dbg !47 {
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// CHECK:STDOUT: entry:
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// CHECK:STDOUT: ret i32 %x, !dbg !53
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// CHECK:STDOUT: }
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// CHECK:STDOUT:
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// CHECK:STDOUT: ; Function Attrs: nounwind
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// CHECK:STDOUT: define linkonce_odr double @_CD.Main.de5b400758c39a65(double %x) #0 !dbg !54 {
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// CHECK:STDOUT: entry:
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// CHECK:STDOUT: ret double %x, !dbg !57
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// CHECK:STDOUT: ret double %x, !dbg !56
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// CHECK:STDOUT: }
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// CHECK:STDOUT:
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// CHECK:STDOUT: ; uselistorder directives
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// CHECK:STDOUT: uselistorder ptr @llvm.lifetime.start.p0, { 0, 1, 3, 2 }
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// CHECK:STDOUT: uselistorder ptr @_CA.Main.582d60b54baf6b63, { 1, 0 }
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// CHECK:STDOUT: uselistorder ptr @llvm.lifetime.start.p0, { 1, 0 }
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// CHECK:STDOUT:
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// CHECK:STDOUT: attributes #0 = { nounwind }
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// CHECK:STDOUT: attributes #1 = { nocallback nofree nosync nounwind willreturn memory(argmem: readwrite) }
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@@ -139,57 +130,56 @@ fn M() {
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// CHECK:STDOUT: !1 = !{i32 2, !"Debug Info Version", i32 3}
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// CHECK:STDOUT: !2 = distinct !DICompileUnit(language: DW_LANG_C_plus_plus, file: !3, producer: "carbon", isOptimized: false, runtimeVersion: 0, emissionKind: FullDebug)
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// CHECK:STDOUT: !3 = !DIFile(filename: "call_different_specific.carbon", directory: "")
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// CHECK:STDOUT: !4 = distinct !DISubprogram(name: "M", linkageName: "_CM.Main", scope: null, file: !3, line: 42, type: !5, spFlags: DISPFlagDefinition, unit: !2)
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// CHECK:STDOUT: !4 = distinct !DISubprogram(name: "M", linkageName: "_CM.Main", scope: null, file: !3, line: 42, type: !5, spFlags: DISPFlagDefinition, unit: !2, retainedNodes: !8)
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// CHECK:STDOUT: !5 = !DISubroutineType(types: !6)
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// CHECK:STDOUT: !6 = !{null}
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// CHECK:STDOUT: !7 = !DILocation(line: 43, column: 3, scope: !4)
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// CHECK:STDOUT: !8 = !DILocation(line: 44, column: 3, scope: !4)
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// CHECK:STDOUT: !9 = !DILocation(line: 46, column: 5, scope: !4)
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// CHECK:STDOUT: !10 = !DILocation(line: 46, column: 3, scope: !4)
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// CHECK:STDOUT: !11 = !DILocation(line: 47, column: 5, scope: !4)
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// CHECK:STDOUT: !12 = !DILocation(line: 47, column: 3, scope: !4)
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// CHECK:STDOUT: !6 = !{null, !7, !7}
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// CHECK:STDOUT: !7 = !DIDerivedType(tag: DW_TAG_pointer_type, baseType: null, size: 8)
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// CHECK:STDOUT: !8 = !{!9, !10}
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// CHECK:STDOUT: !9 = !DILocalVariable(arg: 1, scope: !4, type: !7)
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// CHECK:STDOUT: !10 = !DILocalVariable(arg: 2, scope: !4, type: !7)
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// CHECK:STDOUT: !11 = !DILocation(line: 43, column: 3, scope: !4)
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// CHECK:STDOUT: !12 = !DILocation(line: 44, column: 3, scope: !4)
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// CHECK:STDOUT: !13 = !DILocation(line: 42, column: 1, scope: !4)
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// CHECK:STDOUT: !14 = distinct !DISubprogram(name: "F", linkageName: "_CF.Main.bfb441135f07cbe1", scope: null, file: !3, line: 37, type: !15, spFlags: DISPFlagDefinition, unit: !2, retainedNodes: !18)
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// CHECK:STDOUT: !14 = distinct !DISubprogram(name: "F", linkageName: "_CF.Main.bfb441135f07cbe1", scope: null, file: !3, line: 37, type: !15, spFlags: DISPFlagDefinition, unit: !2, retainedNodes: !17)
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// CHECK:STDOUT: !15 = !DISubroutineType(types: !16)
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// CHECK:STDOUT: !16 = !{null, !17}
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// CHECK:STDOUT: !17 = !DIDerivedType(tag: DW_TAG_pointer_type, baseType: null, size: 8)
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// CHECK:STDOUT: !18 = !{!19}
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// CHECK:STDOUT: !19 = !DILocalVariable(arg: 1, scope: !14, type: !17)
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// CHECK:STDOUT: !20 = !DILocation(line: 38, column: 3, scope: !14)
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// CHECK:STDOUT: !21 = !DILocation(line: 39, column: 3, scope: !14)
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// CHECK:STDOUT: !22 = !DILocation(line: 37, column: 1, scope: !14)
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// CHECK:STDOUT: !23 = distinct !DISubprogram(name: "F", linkageName: "_CF.Main.29cf1dfeccef7249", scope: null, file: !3, line: 37, type: !15, spFlags: DISPFlagDefinition, unit: !2, retainedNodes: !24)
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// CHECK:STDOUT: !24 = !{!25}
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// CHECK:STDOUT: !25 = !DILocalVariable(arg: 1, scope: !23, type: !17)
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// CHECK:STDOUT: !26 = !DILocation(line: 38, column: 3, scope: !23)
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// CHECK:STDOUT: !27 = !DILocation(line: 39, column: 3, scope: !23)
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// CHECK:STDOUT: !28 = !DILocation(line: 37, column: 1, scope: !23)
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// CHECK:STDOUT: !29 = distinct !DISubprogram(name: "A", linkageName: "_CA.Main.582d60b54baf6b63", scope: null, file: !3, line: 25, type: !30, spFlags: DISPFlagDefinition, unit: !2, retainedNodes: !32)
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// CHECK:STDOUT: !30 = !DISubroutineType(types: !31)
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// CHECK:STDOUT: !31 = !{!17, !17}
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// CHECK:STDOUT: !32 = !{!33}
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// CHECK:STDOUT: !33 = !DILocalVariable(arg: 1, scope: !29, type: !17)
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// CHECK:STDOUT: !34 = !DILocation(line: 26, column: 3, scope: !29)
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// CHECK:STDOUT: !35 = distinct !DISubprogram(name: "B", linkageName: "_CB.Main.bfb441135f07cbe1", scope: null, file: !3, line: 33, type: !15, spFlags: DISPFlagDefinition, unit: !2, retainedNodes: !36)
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// CHECK:STDOUT: !36 = !{!37}
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// CHECK:STDOUT: !37 = !DILocalVariable(arg: 1, scope: !35, type: !17)
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// CHECK:STDOUT: !38 = !DILocation(line: 34, column: 3, scope: !35)
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// CHECK:STDOUT: !39 = !DILocation(line: 34, column: 5, scope: !35)
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// CHECK:STDOUT: !40 = !DILocation(line: 33, column: 1, scope: !35)
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// CHECK:STDOUT: !41 = distinct !DISubprogram(name: "B", linkageName: "_CB.Main.29cf1dfeccef7249", scope: null, file: !3, line: 33, type: !15, spFlags: DISPFlagDefinition, unit: !2, retainedNodes: !42)
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// CHECK:STDOUT: !42 = !{!43}
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// CHECK:STDOUT: !43 = !DILocalVariable(arg: 1, scope: !41, type: !17)
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// CHECK:STDOUT: !44 = !DILocation(line: 34, column: 3, scope: !41)
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// CHECK:STDOUT: !45 = !DILocation(line: 34, column: 5, scope: !41)
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// CHECK:STDOUT: !46 = !DILocation(line: 33, column: 1, scope: !41)
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// CHECK:STDOUT: !47 = distinct !DISubprogram(name: "D", linkageName: "_CD.Main.64ccbb8e5d9a0b8e", scope: null, file: !3, line: 29, type: !48, spFlags: DISPFlagDefinition, unit: !2, retainedNodes: !51)
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// CHECK:STDOUT: !48 = !DISubroutineType(types: !49)
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// CHECK:STDOUT: !49 = !{!50, !50}
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// CHECK:STDOUT: !50 = !DIBasicType(name: "int", size: 32, encoding: DW_ATE_signed)
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// CHECK:STDOUT: !51 = !{!52}
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// CHECK:STDOUT: !52 = !DILocalVariable(arg: 1, scope: !47, type: !50)
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// CHECK:STDOUT: !53 = !DILocation(line: 30, column: 3, scope: !47)
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// CHECK:STDOUT: !54 = distinct !DISubprogram(name: "D", linkageName: "_CD.Main.de5b400758c39a65", scope: null, file: !3, line: 29, type: !30, spFlags: DISPFlagDefinition, unit: !2, retainedNodes: !55)
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// CHECK:STDOUT: !55 = !{!56}
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// CHECK:STDOUT: !56 = !DILocalVariable(arg: 1, scope: !54, type: !17)
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// CHECK:STDOUT: !57 = !DILocation(line: 30, column: 3, scope: !54)
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// CHECK:STDOUT: !16 = !{null, !7}
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// CHECK:STDOUT: !17 = !{!18}
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// CHECK:STDOUT: !18 = !DILocalVariable(arg: 1, scope: !14, type: !7)
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// CHECK:STDOUT: !19 = !DILocation(line: 38, column: 3, scope: !14)
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// CHECK:STDOUT: !20 = !DILocation(line: 39, column: 3, scope: !14)
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// CHECK:STDOUT: !21 = !DILocation(line: 37, column: 1, scope: !14)
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// CHECK:STDOUT: !22 = distinct !DISubprogram(name: "F", linkageName: "_CF.Main.29cf1dfeccef7249", scope: null, file: !3, line: 37, type: !15, spFlags: DISPFlagDefinition, unit: !2, retainedNodes: !23)
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// CHECK:STDOUT: !23 = !{!24}
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// CHECK:STDOUT: !24 = !DILocalVariable(arg: 1, scope: !22, type: !7)
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// CHECK:STDOUT: !25 = !DILocation(line: 38, column: 3, scope: !22)
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// CHECK:STDOUT: !26 = !DILocation(line: 39, column: 3, scope: !22)
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// CHECK:STDOUT: !27 = !DILocation(line: 37, column: 1, scope: !22)
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// CHECK:STDOUT: !28 = distinct !DISubprogram(name: "A", linkageName: "_CA.Main.582d60b54baf6b63", scope: null, file: !3, line: 25, type: !29, spFlags: DISPFlagDefinition, unit: !2, retainedNodes: !31)
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// CHECK:STDOUT: !29 = !DISubroutineType(types: !30)
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// CHECK:STDOUT: !30 = !{!7, !7}
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// CHECK:STDOUT: !31 = !{!32}
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// CHECK:STDOUT: !32 = !DILocalVariable(arg: 1, scope: !28, type: !7)
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// CHECK:STDOUT: !33 = !DILocation(line: 26, column: 3, scope: !28)
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// CHECK:STDOUT: !34 = distinct !DISubprogram(name: "B", linkageName: "_CB.Main.bfb441135f07cbe1", scope: null, file: !3, line: 33, type: !15, spFlags: DISPFlagDefinition, unit: !2, retainedNodes: !35)
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// CHECK:STDOUT: !35 = !{!36}
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// CHECK:STDOUT: !36 = !DILocalVariable(arg: 1, scope: !34, type: !7)
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// CHECK:STDOUT: !37 = !DILocation(line: 34, column: 3, scope: !34)
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// CHECK:STDOUT: !38 = !DILocation(line: 34, column: 5, scope: !34)
|
||||
// CHECK:STDOUT: !39 = !DILocation(line: 33, column: 1, scope: !34)
|
||||
// CHECK:STDOUT: !40 = distinct !DISubprogram(name: "B", linkageName: "_CB.Main.29cf1dfeccef7249", scope: null, file: !3, line: 33, type: !15, spFlags: DISPFlagDefinition, unit: !2, retainedNodes: !41)
|
||||
// CHECK:STDOUT: !41 = !{!42}
|
||||
// CHECK:STDOUT: !42 = !DILocalVariable(arg: 1, scope: !40, type: !7)
|
||||
// CHECK:STDOUT: !43 = !DILocation(line: 34, column: 3, scope: !40)
|
||||
// CHECK:STDOUT: !44 = !DILocation(line: 34, column: 5, scope: !40)
|
||||
// CHECK:STDOUT: !45 = !DILocation(line: 33, column: 1, scope: !40)
|
||||
// CHECK:STDOUT: !46 = distinct !DISubprogram(name: "D", linkageName: "_CD.Main.64ccbb8e5d9a0b8e", scope: null, file: !3, line: 29, type: !47, spFlags: DISPFlagDefinition, unit: !2, retainedNodes: !50)
|
||||
// CHECK:STDOUT: !47 = !DISubroutineType(types: !48)
|
||||
// CHECK:STDOUT: !48 = !{!49, !49}
|
||||
// CHECK:STDOUT: !49 = !DIBasicType(name: "int", size: 32, encoding: DW_ATE_signed)
|
||||
// CHECK:STDOUT: !50 = !{!51}
|
||||
// CHECK:STDOUT: !51 = !DILocalVariable(arg: 1, scope: !46, type: !49)
|
||||
// CHECK:STDOUT: !52 = !DILocation(line: 30, column: 3, scope: !46)
|
||||
// CHECK:STDOUT: !53 = distinct !DISubprogram(name: "D", linkageName: "_CD.Main.de5b400758c39a65", scope: null, file: !3, line: 29, type: !29, spFlags: DISPFlagDefinition, unit: !2, retainedNodes: !54)
|
||||
// CHECK:STDOUT: !54 = !{!55}
|
||||
// CHECK:STDOUT: !55 = !DILocalVariable(arg: 1, scope: !53, type: !7)
|
||||
// CHECK:STDOUT: !56 = !DILocation(line: 30, column: 3, scope: !53)
|
||||
|
||||
Reference in New Issue
Block a user