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e023f75254bd282c643e9a55afaa0d4994eee6e7
carbon-lang/toolchain/lower/testdata/function/generic/call_basic_depth.carbon
T
Geoff RomerandRichard Smith e023f75254 Implement thunking in terms of constant evaluation (#7332) 
The bulk of this change is changing most pattern insts to be `Always`
rather than `AlwaysUnique` constants, so that they can be wrapped in
`SpecificConstant`s to perform substitution. That then lets thunking
rely much more on `SpecificConstant` wrappers instead of deep-copying
the inst tree with modified types.

This approach to thunking should scale better, particularly as things
like form generics make function signatures more complex, because we can
leverage the existing support for constant evaluation and substitution.
Unfortunately, applying this approach to binding patterns will require
more work; see the TODO near the top of `thunk.cpp` for details.

---------

Co-authored-by: Richard Smith <richard@metafoo.co.uk>
2026-06-13 00:22:00 +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/int.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_basic_depth.carbon
// TIP: To dump output, run:
// TIP: bazel run //toolchain/testing:file_test -- --dump_output --file_tests=toolchain/lower/testdata/function/generic/call_basic_depth.carbon
// Builds on `call_basic.carbon`. Checks definitions are emitted with deeper
// call stack, i.e., when functions can be type checked without looking at the
// specific calling context.
fn F[T:! type](_: T) {
}
fn H[T:! Core.Copy](x: T) -> T {
F(x);
return x;
}
fn G[T:! Core.Copy & Core.Destroy](x: T) -> T {
H(x);
F(x);
return x;
}
fn M() -> i32 {
var n: i32 = 0;
var m: i32;
F(n);
m = G(n);
return m;
}
// CHECK:STDOUT: ; ModuleID = 'call_basic_depth.carbon'
// CHECK:STDOUT: source_filename = "call_basic_depth.carbon"
// CHECK:STDOUT:
// CHECK:STDOUT: ; Function Attrs: nounwind
// CHECK:STDOUT: define i32 @_CM.Main() #0 !dbg !4 {
// CHECK:STDOUT: entry:
// CHECK:STDOUT: %n.var = alloca i32, align 4, !dbg !8
// CHECK:STDOUT: %m.var = alloca i32, align 4, !dbg !9
// CHECK:STDOUT: call void @llvm.lifetime.start.p0(ptr %n.var), !dbg !8
// CHECK:STDOUT: store i32 0, ptr %n.var, align 4, !dbg !8
// CHECK:STDOUT: call void @llvm.lifetime.start.p0(ptr %m.var), !dbg !9
// CHECK:STDOUT: store i32 poison, ptr %m.var, align 4, !dbg !9
// CHECK:STDOUT: %.loc34 = load i32, ptr %n.var, align 4, !dbg !10
// CHECK:STDOUT: call void @_CF.Main.84588f41d61dafba(i32 %.loc34), !dbg !11
// CHECK:STDOUT: %.loc35_9 = load i32, ptr %n.var, align 4, !dbg !12
// CHECK:STDOUT: %G.call = call i32 @_CG.Main.58016a73bff04416(i32 %.loc35_9), !dbg !13
// CHECK:STDOUT: store i32 %G.call, ptr %m.var, align 4, !dbg !14
// CHECK:STDOUT: %.loc36 = load i32, ptr %m.var, align 4, !dbg !15
// CHECK:STDOUT: call void @"_COp.5e27612b9dd31a14:core.Destroy.Core"(ptr %m.var), !dbg !9
// CHECK:STDOUT: call void @"_COp.5e27612b9dd31a14:core.Destroy.Core"(ptr %n.var), !dbg !8
// CHECK:STDOUT: ret i32 %.loc36, !dbg !16
// CHECK:STDOUT: }
// CHECK:STDOUT:
// CHECK:STDOUT: ; Function Attrs: nounwind
// CHECK:STDOUT: define weak_odr void @"_COp.5e27612b9dd31a14:core.Destroy.Core"(ptr %self) #0 !dbg !17 {
// CHECK:STDOUT: entry:
// CHECK:STDOUT: ret void, !dbg !22
// 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 void @_CF.Main.84588f41d61dafba(i32 %_) #0 !dbg !23 {
// CHECK:STDOUT: entry:
// CHECK:STDOUT: ret void, !dbg !26
// CHECK:STDOUT: }
// CHECK:STDOUT:
// CHECK:STDOUT: ; Function Attrs: nounwind
// CHECK:STDOUT: define linkonce_odr i32 @_CG.Main.58016a73bff04416(i32 %x) #0 !dbg !27 {
// CHECK:STDOUT: entry:
// CHECK:STDOUT: %.loc25_6.3.temp = alloca i32, align 4, !dbg !32
// CHECK:STDOUT: call void @llvm.lifetime.start.p0(ptr %.loc25_6.3.temp), !dbg !32
// CHECK:STDOUT: %H.call = call i32 @_CH.Main.5bd8d5767580997a(i32 %x), !dbg !32
// CHECK:STDOUT: store i32 %H.call, ptr %.loc25_6.3.temp, align 4, !dbg !32
// CHECK:STDOUT: call void @_CF.Main.84588f41d61dafba(i32 %x), !dbg !33
// CHECK:STDOUT: call void @"_COp.5e27612b9dd31a14:core.Destroy.Core"(ptr %.loc25_6.3.temp), !dbg !32
// CHECK:STDOUT: ret i32 %x, !dbg !34
// CHECK:STDOUT: }
// CHECK:STDOUT:
// CHECK:STDOUT: ; Function Attrs: nounwind
// CHECK:STDOUT: define linkonce_odr i32 @_CH.Main.5bd8d5767580997a(i32 %x) #0 !dbg !35 {
// CHECK:STDOUT: entry:
// CHECK:STDOUT: call void @_CF.Main.84588f41d61dafba(i32 %x), !dbg !38
// CHECK:STDOUT: ret i32 %x, !dbg !39
// CHECK:STDOUT: }
// CHECK:STDOUT:
// CHECK:STDOUT: ; uselistorder directives
// CHECK:STDOUT: uselistorder ptr @"_COp.5e27612b9dd31a14:core.Destroy.Core", { 0, 2, 1 }
// CHECK:STDOUT: uselistorder ptr @llvm.lifetime.start.p0, { 0, 2, 1 }
// CHECK:STDOUT:
// CHECK:STDOUT: attributes #0 = { nounwind }
// CHECK:STDOUT: attributes #1 = { nocallback nofree nosync nounwind willreturn memory(argmem: readwrite) }
// CHECK:STDOUT:
// CHECK:STDOUT: !llvm.module.flags = !{!0, !1}
// CHECK:STDOUT: !llvm.dbg.cu = !{!2}
// CHECK:STDOUT:
// CHECK:STDOUT: !0 = !{i32 7, !"Dwarf Version", i32 5}
// CHECK:STDOUT: !1 = !{i32 2, !"Debug Info Version", i32 3}
// CHECK:STDOUT: !2 = distinct !DICompileUnit(language: DW_LANG_C_plus_plus, file: !3, producer: "carbon", isOptimized: false, runtimeVersion: 0, emissionKind: FullDebug)
// CHECK:STDOUT: !3 = !DIFile(filename: "call_basic_depth.carbon", directory: "")
// CHECK:STDOUT: !4 = distinct !DISubprogram(name: "M", linkageName: "_CM.Main", scope: null, file: !3, line: 30, type: !5, spFlags: DISPFlagDefinition, unit: !2)
// CHECK:STDOUT: !5 = !DISubroutineType(types: !6)
// CHECK:STDOUT: !6 = !{!7}
// CHECK:STDOUT: !7 = !DIBasicType(name: "int", size: 32, encoding: DW_ATE_signed)
// CHECK:STDOUT: !8 = !DILocation(line: 31, column: 3, scope: !4)
// CHECK:STDOUT: !9 = !DILocation(line: 32, column: 3, scope: !4)
// CHECK:STDOUT: !10 = !DILocation(line: 34, column: 5, scope: !4)
// CHECK:STDOUT: !11 = !DILocation(line: 34, column: 3, scope: !4)
// CHECK:STDOUT: !12 = !DILocation(line: 35, column: 9, scope: !4)
// CHECK:STDOUT: !13 = !DILocation(line: 35, column: 7, scope: !4)
// CHECK:STDOUT: !14 = !DILocation(line: 35, column: 3, scope: !4)
// CHECK:STDOUT: !15 = !DILocation(line: 36, column: 10, scope: !4)
// CHECK:STDOUT: !16 = !DILocation(line: 36, column: 3, scope: !4)
// CHECK:STDOUT: !17 = distinct !DISubprogram(name: "Op", linkageName: "_COp.5e27612b9dd31a14:core.Destroy.Core", scope: null, file: !3, line: 35, type: !18, spFlags: DISPFlagDefinition, unit: !2, retainedNodes: !20)
// CHECK:STDOUT: !18 = !DISubroutineType(types: !19)
// CHECK:STDOUT: !19 = !{null, !7}
// CHECK:STDOUT: !20 = !{!21}
// CHECK:STDOUT: !21 = !DILocalVariable(arg: 1, scope: !17, type: !7)
// CHECK:STDOUT: !22 = !DILocation(line: 35, column: 7, scope: !17)
// CHECK:STDOUT: !23 = distinct !DISubprogram(name: "F", linkageName: "_CF.Main.84588f41d61dafba", scope: null, file: !3, line: 16, type: !18, spFlags: DISPFlagDefinition, unit: !2, retainedNodes: !24)
// CHECK:STDOUT: !24 = !{!25}
// CHECK:STDOUT: !25 = !DILocalVariable(arg: 1, scope: !23, type: !7)
// CHECK:STDOUT: !26 = !DILocation(line: 16, column: 1, scope: !23)
// CHECK:STDOUT: !27 = distinct !DISubprogram(name: "G", linkageName: "_CG.Main.58016a73bff04416", scope: null, file: !3, line: 24, type: !28, spFlags: DISPFlagDefinition, unit: !2, retainedNodes: !30)
// CHECK:STDOUT: !28 = !DISubroutineType(types: !29)
// CHECK:STDOUT: !29 = !{!7, !7}
// CHECK:STDOUT: !30 = !{!31}
// CHECK:STDOUT: !31 = !DILocalVariable(arg: 1, scope: !27, type: !7)
// CHECK:STDOUT: !32 = !DILocation(line: 25, column: 3, scope: !27)
// CHECK:STDOUT: !33 = !DILocation(line: 26, column: 3, scope: !27)
// CHECK:STDOUT: !34 = !DILocation(line: 27, column: 3, scope: !27)
// CHECK:STDOUT: !35 = distinct !DISubprogram(name: "H", linkageName: "_CH.Main.5bd8d5767580997a", scope: null, file: !3, line: 19, type: !28, spFlags: DISPFlagDefinition, unit: !2, retainedNodes: !36)
// CHECK:STDOUT: !36 = !{!37}
// CHECK:STDOUT: !37 = !DILocalVariable(arg: 1, scope: !35, type: !7)
// CHECK:STDOUT: !38 = !DILocation(line: 20, column: 3, scope: !35)
// CHECK:STDOUT: !39 = !DILocation(line: 21, column: 3, scope: !35)
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