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carbon-lang/toolchain/lower/testdata/function/generic/call_different_specific.carbon
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Richard Smith dea290db81 Only lower files we are going to emit. (#7611) 
Move `--output-last-file-only` and output filename synthesis logic out
of the general-purpose compile driver and into the `carbon compile`
subcommand, which is the only thing that should be using them. Track on
CompilationUnit whether it is being lowered, or whether it exists only
to be imported into other units.

`carbon compile` now never lowers inputs that it discovered for itself,
only inputs that were specified on the command line. In particular, it
doesn't lower (and throw away the result of lowering) the prelude any
more. This makes the toolchain tests about 10% faster in my crude
measurements.

Also, we now do not create a clang `CodeGenerator` for input files that
we are not lowering, similarly saving compilation time for units that
exist only to be imported, not lowered.

One minor change: we use the same mechanism to determine whether an
input is being lowered and to determine what the output filename is.
This means that `--phase=lower` and `--phase=optimize`, which lower but
don't produce an output file, still need an output filename to be
specified now in some cases. Given those are just debugging tools, I
think that's fine.

Assisted-by: Gemini via Antigravity
2026-08-05 12:52:24 +00:00

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// Part of the Carbon Language project, under the Apache License v2.0 with LLVM
// Exceptions. See /LICENSE for license information.
// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
//
// INCLUDE-FILE: toolchain/testing/testdata/min_prelude/full.carbon
//
// AUTOUPDATE
// TIP: To test this file alone, run:
// TIP: bazel test //toolchain/testing:file_test --test_arg=--file_tests=toolchain/lower/testdata/function/generic/call_different_specific.carbon
// TIP: To dump output, run:
// TIP: bazel run //toolchain/testing:file_test -- --dump_output --file_tests=toolchain/lower/testdata/function/generic/call_different_specific.carbon
// Builds on call_basic.carbon and call_impl_function.carbon.
// Test that when equivalence is found for the specific fingerprint, we don't
// conclude "equivalent" for all the call graph.
// The two calls to F have the same function type, but the corresponding
// definitions should not be coalesced. The function bodies of the two
// specifics of F look mostly identical: same type for the parameters,
// calling the same A and different specifics of B, with the same function
// type. The difference is discovered in the call graph inside the two B
// specifics, where the pointer values are different, and the calls to the
// two D specifics are to functions with different function types.
fn A[U: Core.Copy](x: U) -> U {
return x;
}
fn D[U: Core.Copy](x: U) -> U {
return x;
}
fn B[U: Core.Copy & Core.Destroy](x: U*) {
D(*x);
}
fn F[T: Core.Copy & Core.Destroy](x: T*) {
A(i32);
B(x);
}
fn M(ptr_i32: i32*, ptr_f64: f64*) {
F(ptr_i32);
F(ptr_f64);
}
// CHECK:STDOUT: ; ---
// CHECK:STDOUT: ; ModuleID = 'call_different_specific.carbon'
// CHECK:STDOUT: source_filename = "call_different_specific.carbon"
// CHECK:STDOUT:
// CHECK:STDOUT: %type.0 = type {}
// CHECK:STDOUT:
// CHECK:STDOUT: ; Function Attrs: nounwind
// CHECK:STDOUT: define void @_CM.Main(ptr %ptr_i32, ptr %ptr_f64) #0 !dbg !4 {
// CHECK:STDOUT: entry:
// CHECK:STDOUT: call void @_CF.Main.58016a73bff04416(ptr %ptr_i32), !dbg !11
// CHECK:STDOUT: call void @_CF.Main.fa1f0912a5bbe922(ptr %ptr_f64), !dbg !12
// CHECK:STDOUT: ret void, !dbg !13
// CHECK:STDOUT: }
// CHECK:STDOUT:
// CHECK:STDOUT: ; Function Attrs: nounwind
// CHECK:STDOUT: define weak_odr void @"_COp.5e27612b9dd31a14:core.Destroy.Core"(ptr %self) #0 !dbg !14 {
// CHECK:STDOUT: entry:
// CHECK:STDOUT: ret void, !dbg !20
// CHECK:STDOUT: }
// CHECK:STDOUT:
// CHECK:STDOUT: ; Function Attrs: nounwind
// CHECK:STDOUT: define weak_odr void @"_COp.30d8007fdcc57f83:core.Destroy.Core"(ptr %self) #0 !dbg !21 {
// CHECK:STDOUT: entry:
// CHECK:STDOUT: ret void, !dbg !26
// CHECK:STDOUT: }
// CHECK:STDOUT:
// CHECK:STDOUT: ; Function Attrs: nounwind
// CHECK:STDOUT: define linkonce_odr void @_CF.Main.58016a73bff04416(ptr %x) #0 !dbg !27 {
// CHECK:STDOUT: entry:
// CHECK:STDOUT: %A.call = call %type.0 @_CA.Main.ee509b43cf4eb3c5(%type.0 zeroinitializer), !dbg !30
// CHECK:STDOUT: call void @_CB.Main.58016a73bff04416(ptr %x), !dbg !31
// CHECK:STDOUT: ret void, !dbg !32
// CHECK:STDOUT: }
// CHECK:STDOUT:
// CHECK:STDOUT: ; Function Attrs: nounwind
// CHECK:STDOUT: define linkonce_odr void @_CF.Main.fa1f0912a5bbe922(ptr %x) #0 !dbg !33 {
// CHECK:STDOUT: entry:
// CHECK:STDOUT: %A.call = call %type.0 @_CA.Main.ee509b43cf4eb3c5(%type.0 zeroinitializer), !dbg !36
// CHECK:STDOUT: call void @_CB.Main.fa1f0912a5bbe922(ptr %x), !dbg !37
// CHECK:STDOUT: ret void, !dbg !38
// CHECK:STDOUT: }
// CHECK:STDOUT:
// CHECK:STDOUT: ; Function Attrs: nounwind
// CHECK:STDOUT: define linkonce_odr %type.0 @_CA.Main.ee509b43cf4eb3c5(%type.0 %x) #0 !dbg !39 {
// CHECK:STDOUT: entry:
// CHECK:STDOUT: ret %type.0 %x, !dbg !44
// CHECK:STDOUT: }
// CHECK:STDOUT:
// CHECK:STDOUT: ; Function Attrs: nounwind
// CHECK:STDOUT: define linkonce_odr void @_CB.Main.58016a73bff04416(ptr %x) #0 !dbg !45 {
// CHECK:STDOUT: entry:
// CHECK:STDOUT: %.loc34_7.3.temp = alloca i32, align 4, !dbg !48
// CHECK:STDOUT: call void @llvm.lifetime.start.p0(ptr %.loc34_7.3.temp), !dbg !48
// CHECK:STDOUT: %.loc34_5.2 = load i32, ptr %x, align 4, !dbg !49
// CHECK:STDOUT: %D.call = call i32 @_CD.Main.5bd8d5767580997a(i32 %.loc34_5.2), !dbg !48
// CHECK:STDOUT: store i32 %D.call, ptr %.loc34_7.3.temp, align 4, !dbg !48
// CHECK:STDOUT: call void @"_COp.5e27612b9dd31a14:core.Destroy.Core"(ptr %.loc34_7.3.temp), !dbg !48
// CHECK:STDOUT: ret void, !dbg !50
// CHECK:STDOUT: }
// CHECK:STDOUT:
// CHECK:STDOUT: ; Function Attrs: nounwind
// CHECK:STDOUT: define linkonce_odr void @_CB.Main.fa1f0912a5bbe922(ptr %x) #0 !dbg !51 {
// CHECK:STDOUT: entry:
// CHECK:STDOUT: %.loc34_7.3.temp = alloca double, align 8, !dbg !54
// CHECK:STDOUT: call void @llvm.lifetime.start.p0(ptr %.loc34_7.3.temp), !dbg !54
// CHECK:STDOUT: %.loc34_5.2 = load double, ptr %x, align 8, !dbg !55
// CHECK:STDOUT: %D.call = call double @_CD.Main.c27b765f2159c9a0(double %.loc34_5.2), !dbg !54
// CHECK:STDOUT: store double %D.call, ptr %.loc34_7.3.temp, align 8, !dbg !54
// CHECK:STDOUT: call void @"_COp.30d8007fdcc57f83:core.Destroy.Core"(ptr %.loc34_7.3.temp), !dbg !54
// CHECK:STDOUT: ret void, !dbg !56
// CHECK:STDOUT: }
// CHECK:STDOUT:
// CHECK:STDOUT: ; Function Attrs: nocallback nofree nosync nounwind willreturn memory(argmem: readwrite)
// CHECK:STDOUT: declare void @llvm.lifetime.start.p0(ptr captures(none)) #1
// CHECK:STDOUT:
// CHECK:STDOUT: ; Function Attrs: nounwind
// CHECK:STDOUT: define linkonce_odr i32 @_CD.Main.5bd8d5767580997a(i32 %x) #0 !dbg !57 {
// CHECK:STDOUT: entry:
// CHECK:STDOUT: ret i32 %x, !dbg !62
// CHECK:STDOUT: }
// CHECK:STDOUT:
// CHECK:STDOUT: ; Function Attrs: nounwind
// CHECK:STDOUT: define linkonce_odr double @_CD.Main.c27b765f2159c9a0(double %x) #0 !dbg !63 {
// CHECK:STDOUT: entry:
// CHECK:STDOUT: ret double %x, !dbg !66
// CHECK:STDOUT: }
// CHECK:STDOUT:
// CHECK:STDOUT: ; uselistorder directives
// CHECK:STDOUT: uselistorder ptr @_CA.Main.ee509b43cf4eb3c5, { 1, 0 }
// CHECK:STDOUT: uselistorder ptr @llvm.lifetime.start.p0, { 1, 0 }
// CHECK:STDOUT:
// CHECK:STDOUT: attributes #0 = { nounwind }
// CHECK:STDOUT: attributes #1 = { nocallback nofree nosync nounwind willreturn memory(argmem: readwrite) }
// CHECK:STDOUT:
// CHECK:STDOUT: !llvm.dbg.cu = !{!0}
// CHECK:STDOUT: !llvm.module.flags = !{!2, !3}
// CHECK:STDOUT:
// CHECK:STDOUT: !0 = distinct !DICompileUnit(language: DW_LANG_C_plus_plus, file: !1, producer: "carbon", isOptimized: false, runtimeVersion: 0, emissionKind: FullDebug)
// CHECK:STDOUT: !1 = !DIFile(filename: "call_different_specific.carbon", directory: "")
// CHECK:STDOUT: !2 = !{i32 7, !"Dwarf Version", i32 5}
// CHECK:STDOUT: !3 = !{i32 2, !"Debug Info Version", i32 3}
// CHECK:STDOUT: !4 = distinct !DISubprogram(name: "M", linkageName: "_CM.Main", scope: null, file: !1, line: 42, type: !5, spFlags: DISPFlagDefinition, unit: !0, retainedNodes: !8)
// CHECK:STDOUT: !5 = !DISubroutineType(types: !6)
// CHECK:STDOUT: !6 = !{null, !7, !7}
// CHECK:STDOUT: !7 = !DIDerivedType(tag: DW_TAG_pointer_type, baseType: null, size: 64)
// CHECK:STDOUT: !8 = !{!9, !10}
// CHECK:STDOUT: !9 = !DILocalVariable(arg: 1, scope: !4, type: !7)
// CHECK:STDOUT: !10 = !DILocalVariable(arg: 2, scope: !4, type: !7)
// CHECK:STDOUT: !11 = !DILocation(line: 43, column: 3, scope: !4)
// CHECK:STDOUT: !12 = !DILocation(line: 44, column: 3, scope: !4)
// CHECK:STDOUT: !13 = !DILocation(line: 42, column: 1, scope: !4)
// CHECK:STDOUT: !14 = distinct !DISubprogram(name: "Op", linkageName: "_COp.5e27612b9dd31a14:core.Destroy.Core", scope: null, file: !1, line: 43, type: !15, spFlags: DISPFlagDefinition, unit: !0, retainedNodes: !18)
// CHECK:STDOUT: !15 = !DISubroutineType(types: !16)
// CHECK:STDOUT: !16 = !{null, !17}
// CHECK:STDOUT: !17 = !DIBasicType(name: "int", size: 32, encoding: DW_ATE_signed)
// CHECK:STDOUT: !18 = !{!19}
// CHECK:STDOUT: !19 = !DILocalVariable(arg: 1, scope: !14, type: !17)
// CHECK:STDOUT: !20 = !DILocation(line: 43, column: 3, scope: !14)
// CHECK:STDOUT: !21 = distinct !DISubprogram(name: "Op", linkageName: "_COp.30d8007fdcc57f83:core.Destroy.Core", scope: null, file: !1, line: 44, type: !22, spFlags: DISPFlagDefinition, unit: !0, retainedNodes: !24)
// CHECK:STDOUT: !22 = !DISubroutineType(types: !23)
// CHECK:STDOUT: !23 = !{null, !7}
// CHECK:STDOUT: !24 = !{!25}
// CHECK:STDOUT: !25 = !DILocalVariable(arg: 1, scope: !21, type: !7)
// CHECK:STDOUT: !26 = !DILocation(line: 44, column: 3, scope: !21)
// CHECK:STDOUT: !27 = distinct !DISubprogram(name: "F", linkageName: "_CF.Main.58016a73bff04416", scope: null, file: !1, line: 37, type: !22, spFlags: DISPFlagDefinition, unit: !0, retainedNodes: !28)
// CHECK:STDOUT: !28 = !{!29}
// CHECK:STDOUT: !29 = !DILocalVariable(arg: 1, scope: !27, type: !7)
// CHECK:STDOUT: !30 = !DILocation(line: 38, column: 3, scope: !27)
// CHECK:STDOUT: !31 = !DILocation(line: 39, column: 3, scope: !27)
// CHECK:STDOUT: !32 = !DILocation(line: 37, column: 1, scope: !27)
// CHECK:STDOUT: !33 = distinct !DISubprogram(name: "F", linkageName: "_CF.Main.fa1f0912a5bbe922", scope: null, file: !1, line: 37, type: !22, spFlags: DISPFlagDefinition, unit: !0, retainedNodes: !34)
// CHECK:STDOUT: !34 = !{!35}
// CHECK:STDOUT: !35 = !DILocalVariable(arg: 1, scope: !33, type: !7)
// CHECK:STDOUT: !36 = !DILocation(line: 38, column: 3, scope: !33)
// CHECK:STDOUT: !37 = !DILocation(line: 39, column: 3, scope: !33)
// CHECK:STDOUT: !38 = !DILocation(line: 37, column: 1, scope: !33)
// CHECK:STDOUT: !39 = distinct !DISubprogram(name: "A", linkageName: "_CA.Main.ee509b43cf4eb3c5", scope: null, file: !1, line: 25, type: !40, spFlags: DISPFlagDefinition, unit: !0, retainedNodes: !42)
// CHECK:STDOUT: !40 = !DISubroutineType(types: !41)
// CHECK:STDOUT: !41 = !{!7, !7}
// CHECK:STDOUT: !42 = !{!43}
// CHECK:STDOUT: !43 = !DILocalVariable(arg: 1, scope: !39, type: !7)
// CHECK:STDOUT: !44 = !DILocation(line: 26, column: 3, scope: !39)
// CHECK:STDOUT: !45 = distinct !DISubprogram(name: "B", linkageName: "_CB.Main.58016a73bff04416", scope: null, file: !1, line: 33, type: !22, spFlags: DISPFlagDefinition, unit: !0, retainedNodes: !46)
// CHECK:STDOUT: !46 = !{!47}
// CHECK:STDOUT: !47 = !DILocalVariable(arg: 1, scope: !45, type: !7)
// CHECK:STDOUT: !48 = !DILocation(line: 34, column: 3, scope: !45)
// CHECK:STDOUT: !49 = !DILocation(line: 34, column: 5, scope: !45)
// CHECK:STDOUT: !50 = !DILocation(line: 33, column: 1, scope: !45)
// CHECK:STDOUT: !51 = distinct !DISubprogram(name: "B", linkageName: "_CB.Main.fa1f0912a5bbe922", scope: null, file: !1, line: 33, type: !22, spFlags: DISPFlagDefinition, unit: !0, retainedNodes: !52)
// CHECK:STDOUT: !52 = !{!53}
// CHECK:STDOUT: !53 = !DILocalVariable(arg: 1, scope: !51, type: !7)
// CHECK:STDOUT: !54 = !DILocation(line: 34, column: 3, scope: !51)
// CHECK:STDOUT: !55 = !DILocation(line: 34, column: 5, scope: !51)
// CHECK:STDOUT: !56 = !DILocation(line: 33, column: 1, scope: !51)
// CHECK:STDOUT: !57 = distinct !DISubprogram(name: "D", linkageName: "_CD.Main.5bd8d5767580997a", scope: null, file: !1, line: 29, type: !58, spFlags: DISPFlagDefinition, unit: !0, retainedNodes: !60)
// CHECK:STDOUT: !58 = !DISubroutineType(types: !59)
// CHECK:STDOUT: !59 = !{!17, !17}
// CHECK:STDOUT: !60 = !{!61}
// CHECK:STDOUT: !61 = !DILocalVariable(arg: 1, scope: !57, type: !17)
// CHECK:STDOUT: !62 = !DILocation(line: 30, column: 3, scope: !57)
// CHECK:STDOUT: !63 = distinct !DISubprogram(name: "D", linkageName: "_CD.Main.c27b765f2159c9a0", scope: null, file: !1, line: 29, type: !40, spFlags: DISPFlagDefinition, unit: !0, retainedNodes: !64)
// CHECK:STDOUT: !64 = !{!65}
// CHECK:STDOUT: !65 = !DILocalVariable(arg: 1, scope: !63, type: !7)
// CHECK:STDOUT: !66 = !DILocation(line: 30, column: 3, scope: !63)
// CHECK:STDOUT:
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