mirror of
https://github.com/carbon-language/carbon-lang.git
synced 2026-09-28 07:30:11 +01:00
David BlaikieandDana Jansens
a179bd461b
This adds just enough debug info for i32/int parameters and return
values, with a path forward for adding DWARF type metadata for other
types.
As it happens, return type information is carried separately from
parameter information:
* Return type information is carried in the `type` of the `DISubprogram`
(as a `DISubroutineType` - which does carry parameter type information
as well, but that's unused when the DWARF is emitted by LLVM)
* Parameter information is carried by `DILocalVariable`s with a non-zero
`arg` value (representing the order of function parameters)
In the absence of locations for the parameters (future work), nothing
would usually keep the `DILocalVariable` live/reachable when emitting
DWARF - so for cases where this can happen (for clang, this happens in
optimized builds where all references to the parameter variable might be
optimized away) the variables can be "retained" in a list on the
`DISubprogram` - achieved by passing `AlwaysPreserve` parameter to
`createParameterVariable` (adds them to a list, then that list gets
attached to the `DISubprogram` when it's finalized later)
For now, any unsupported types are emitted as `void*` (except void
return, which is implemented as void) as a placeholder.
Given this example:
```
import Core library "io";
class MyClass {
}
fn Unsupported(v: MyClass) {
}
fn Ret() -> i32 {
return 42;
}
fn Arg(x: i32) {
Core.Print(x);
}
fn Run() {
}
```
this is the resulting DWARF:
```
DW_TAG_compile_unit
DW_AT_name ("test.carbon")
DW_TAG_subprogram
DW_AT_name ("Unsupported")
DW_TAG_formal_parameter
DW_AT_type (0x00000066 "void *")
DW_TAG_subprogram
DW_AT_name ("Ret")
DW_AT_type (0x00000062 "int")
DW_TAG_subprogram
DW_AT_name ("Arg")
DW_TAG_formal_parameter
DW_AT_type (0x00000062 "int")
DW_TAG_subprogram
DW_AT_name ("Run")
DW_TAG_base_type
DW_AT_name ("int")
DW_TAG_pointer_type
```
And the debugger:
```
(gdb) p Ret()
$1 = 42
(gdb) p Arg(4)
4
$2 = void
```
I'm not sure if there's a way this logic should be merged with the logic
for making the `llvm::Function` type (which the `DISubroutineType`
building code was inspired by/copied from) - since they're done at
different times/places, I don't think there's an easy way to do it in
one pass, but maybe the code can be shared (even if it's run twice) in
some generic `SemIR::Function` type walker.
---------
Co-authored-by: Dana Jansens <danakj@orodu.net>
78 lines
3.8 KiB
Plaintext
78 lines
3.8 KiB
Plaintext
// 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/interop/cpp/import_inline.carbon
|
|
// TIP: To dump output, run:
|
|
// TIP: bazel run //toolchain/testing:file_test -- --dump_output --file_tests=toolchain/lower/testdata/interop/cpp/import_inline.carbon
|
|
|
|
import Cpp inline '''
|
|
|
|
void F(int *_Nonnull p) {
|
|
*p = 1;
|
|
}
|
|
|
|
''';
|
|
|
|
fn Call() -> i32 {
|
|
var n: i32 = 0;
|
|
Cpp.F(&n);
|
|
return n;
|
|
}
|
|
|
|
// CHECK:STDOUT: ; ModuleID = 'import_inline.carbon'
|
|
// CHECK:STDOUT: source_filename = "import_inline.carbon"
|
|
// CHECK:STDOUT: target datalayout = "e-m:e-p270:32:32-p271:32:32-p272:64:64-i64:64-i128:128-f80:128-n8:16:32:64-S128"
|
|
// CHECK:STDOUT: target triple = "x86_64-unknown-linux-gnu"
|
|
// CHECK:STDOUT:
|
|
// CHECK:STDOUT: ; Function Attrs: nounwind
|
|
// CHECK:STDOUT: define i32 @_CCall.Main() #0 !dbg !7 {
|
|
// CHECK:STDOUT: entry:
|
|
// CHECK:STDOUT: %n.var = alloca i32, align 4, !dbg !11
|
|
// CHECK:STDOUT: call void @llvm.lifetime.start.p0(ptr %n.var), !dbg !11
|
|
// CHECK:STDOUT: store i32 0, ptr %n.var, align 4, !dbg !11
|
|
// CHECK:STDOUT: call void @_Z1FPi(ptr %n.var), !dbg !12
|
|
// CHECK:STDOUT: %.loc24 = load i32, ptr %n.var, align 4, !dbg !13
|
|
// CHECK:STDOUT: ret i32 %.loc24, !dbg !14
|
|
// 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: mustprogress noinline nounwind optnone
|
|
// CHECK:STDOUT: define dso_local void @_Z1FPi(ptr %p) #2 {
|
|
// CHECK:STDOUT: entry:
|
|
// CHECK:STDOUT: %p.addr = alloca ptr, align 8
|
|
// CHECK:STDOUT: store ptr %p, ptr %p.addr, align 8
|
|
// CHECK:STDOUT: %0 = load ptr, ptr %p.addr, align 8
|
|
// CHECK:STDOUT: store i32 1, ptr %0, align 4
|
|
// CHECK:STDOUT: ret void
|
|
// CHECK:STDOUT: }
|
|
// CHECK:STDOUT:
|
|
// CHECK:STDOUT: attributes #0 = { nounwind }
|
|
// CHECK:STDOUT: attributes #1 = { nocallback nofree nosync nounwind willreturn memory(argmem: readwrite) }
|
|
// CHECK:STDOUT: attributes #2 = { mustprogress noinline nounwind optnone "min-legal-vector-width"="0" "no-trapping-math"="true" "stack-protector-buffer-size"="0" "target-cpu"="x86-64" "target-features"="+cmov,+cx8,+fxsr,+mmx,+sse,+sse2,+x87" "tune-cpu"="generic" }
|
|
// CHECK:STDOUT:
|
|
// CHECK:STDOUT: !llvm.module.flags = !{!0, !1, !2, !3, !4}
|
|
// CHECK:STDOUT: !llvm.dbg.cu = !{!5}
|
|
// CHECK:STDOUT:
|
|
// CHECK:STDOUT: !0 = !{i32 7, !"Dwarf Version", i32 5}
|
|
// CHECK:STDOUT: !1 = !{i32 2, !"Debug Info Version", i32 3}
|
|
// CHECK:STDOUT: !2 = !{i32 1, !"wchar_size", i32 4}
|
|
// CHECK:STDOUT: !3 = !{i32 8, !"PIC Level", i32 0}
|
|
// CHECK:STDOUT: !4 = !{i32 7, !"PIE Level", i32 2}
|
|
// CHECK:STDOUT: !5 = distinct !DICompileUnit(language: DW_LANG_C_plus_plus, file: !6, producer: "carbon", isOptimized: false, runtimeVersion: 0, emissionKind: FullDebug)
|
|
// CHECK:STDOUT: !6 = !DIFile(filename: "import_inline.carbon", directory: "")
|
|
// CHECK:STDOUT: !7 = distinct !DISubprogram(name: "Call", linkageName: "_CCall.Main", scope: null, file: !6, line: 21, type: !8, spFlags: DISPFlagDefinition, unit: !5)
|
|
// CHECK:STDOUT: !8 = !DISubroutineType(types: !9)
|
|
// CHECK:STDOUT: !9 = !{!10}
|
|
// CHECK:STDOUT: !10 = !DIBasicType(name: "int", size: 32, encoding: DW_ATE_signed)
|
|
// CHECK:STDOUT: !11 = !DILocation(line: 22, column: 3, scope: !7)
|
|
// CHECK:STDOUT: !12 = !DILocation(line: 23, column: 3, scope: !7)
|
|
// CHECK:STDOUT: !13 = !DILocation(line: 24, column: 10, scope: !7)
|
|
// CHECK:STDOUT: !14 = !DILocation(line: 24, column: 3, scope: !7)
|