mirror of
https://github.com/carbon-language/carbon-lang.git
synced 2026-10-05 22:02:55 +01:00
David Blaikie
bb9942823f
This helps at least lldb handle calling functions (currently the debug
info describes every function as `void()`, so no parameters or return
values are supported) - seems gdb and lldb both depend on demangling to
varying degrees in C code (marking a function as "prototyped" in C in
DWARF does seem to also address this problem).
Given:
```
fn PrintThree() {
Core.Print(3);
}
```
Before:
```
(lldb) p PrintThree()
error: Couldn't look up symbols:
PrintThree
Hint: The expression tried to call a function that is not present in
the target, perhaps because it was optimized out by the compiler.
```
After:
```
(lldb) p PrintThree()
3
(lldb)
```
59 lines
2.6 KiB
Plaintext
59 lines
2.6 KiB
Plaintext
// Part of the Carbon Language project, under the Apache License v2.0 with LLVM
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// Exceptions. See /LICENSE for license information.
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// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
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//
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// INCLUDE-FILE: toolchain/testing/testdata/min_prelude/bool.carbon
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//
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// AUTOUPDATE
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// TIP: To test this file alone, run:
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// TIP: bazel test //toolchain/testing:file_test --test_arg=--file_tests=toolchain/lower/testdata/builtins/pointer.carbon
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// TIP: To dump output, run:
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// TIP: bazel run //toolchain/testing:file_test -- --dump_output --file_tests=toolchain/lower/testdata/builtins/pointer.carbon
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fn MakeUnformed(t: type) -> type = "maybe_unformed.make_type";
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fn MakeNull(T:! type) -> MakeUnformed(T*) = "pointer.make_null";
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fn IsNull[T:! type](p: MakeUnformed(T*)) -> bool = "pointer.is_null";
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class C {}
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fn Null() -> MakeUnformed(C*) {
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return MakeNull(C);
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}
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fn Check(p: MakeUnformed(C*)) -> bool {
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return IsNull(p);
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}
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// CHECK:STDOUT: ; ModuleID = 'pointer.carbon'
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// CHECK:STDOUT: source_filename = "pointer.carbon"
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// CHECK:STDOUT:
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// CHECK:STDOUT: ; Function Attrs: nounwind
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// CHECK:STDOUT: define ptr @_CNull.Main() #0 !dbg !4 {
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// CHECK:STDOUT: entry:
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// CHECK:STDOUT: ret ptr null, !dbg !7
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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 i1 @_CCheck.Main(ptr %p) #0 !dbg !8 {
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// CHECK:STDOUT: entry:
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// CHECK:STDOUT: %IsNull.call = icmp eq ptr %p, null, !dbg !9
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// CHECK:STDOUT: ret i1 %IsNull.call, !dbg !10
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// CHECK:STDOUT: }
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// CHECK:STDOUT:
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// CHECK:STDOUT: attributes #0 = { nounwind }
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// CHECK:STDOUT:
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// CHECK:STDOUT: !llvm.module.flags = !{!0, !1}
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// CHECK:STDOUT: !llvm.dbg.cu = !{!2}
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// CHECK:STDOUT:
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// CHECK:STDOUT: !0 = !{i32 7, !"Dwarf Version", i32 5}
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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: "pointer.carbon", directory: "")
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// CHECK:STDOUT: !4 = distinct !DISubprogram(name: "Null", linkageName: "_CNull.Main", scope: null, file: !3, line: 19, type: !5, spFlags: DISPFlagDefinition, unit: !2)
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// CHECK:STDOUT: !5 = !DISubroutineType(types: !6)
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// CHECK:STDOUT: !6 = !{}
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// CHECK:STDOUT: !7 = !DILocation(line: 20, column: 3, scope: !4)
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// CHECK:STDOUT: !8 = distinct !DISubprogram(name: "Check", linkageName: "_CCheck.Main", scope: null, file: !3, line: 23, type: !5, spFlags: DISPFlagDefinition, unit: !2)
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// CHECK:STDOUT: !9 = !DILocation(line: 24, column: 10, scope: !8)
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// CHECK:STDOUT: !10 = !DILocation(line: 24, column: 3, scope: !8)
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