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67b287a2f27a2ad0ac64e8af10c39338d9e24af8
carbon-lang/toolchain/lower/testdata/array/function_param.carbon
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David Blaikie 67b287a2f2 DebugInfo: Add the name as-written, separate from the mangled name (#4253) 
There's not much mangling happening yet - but Run -> main (and some
overloading numbering happening, maybe LLVM is doing that 'helpfully'
under the hood?) is enough to demonstrate this improvement/fix.

Ah, here it is:
```
#0  llvm::ValueSymbolTable::makeUniqueName (this=0x50287fe5b6c0, V=0x50287fe827e8, UniqueName="F") at external/_main~llvm_project~llvm-project/llvm/lib/IR/ValueSymbolTable.cpp:45
#1  0x000055555c40f964 in llvm::ValueSymbolTable::reinsertValue (this=0x50287fe5b6c0, V=0x50287fe827e8) at external/_main~llvm_project~llvm-project/llvm/lib/IR/ValueSymbolTable.cpp:100
#2  0x000055555c2a91df in llvm::SymbolTableListTraits<llvm::Function>::addNodeToList (this=0x50287fd16f18, V=0x50287fe827e8) at external/_main~llvm_project~llvm-project/llvm/lib/IR/SymbolTableListTraitsImpl.h:75
#3  0x000055555c2a90e5 in llvm::iplist_impl<llvm::simple_ilist<llvm::Function>, llvm::SymbolTableListTraits<llvm::Function> >::insert (this=0x50287fd16f18, where=..., New=0x50287fe827e8)
    at external/_main~llvm_project~llvm-project/llvm/include/llvm/ADT/ilist.h:166
#4  0x000055555c27fef2 in llvm::iplist_impl<llvm::simple_ilist<llvm::Function>, llvm::SymbolTableListTraits<llvm::Function> >::push_back (this=0x50287fd16f18, val=0x50287fe827e8) at external/_main~llvm_project~llvm-project/llvm/include/llvm/ADT/ilist.h:250
#5  0x000055555c27faeb in llvm::Function::Function (this=0x50287fe827e8, Ty=0x50287fd43058, Linkage=llvm::GlobalValue::ExternalLinkage, AddrSpace=0, name="F", ParentModule=0x50287fd16f00) at external/_main~llvm_project~llvm-project/llvm/lib/IR/Function.cpp:521
#6  0x0000555559441f95 in llvm::Function::Create (Ty=0x50287fd43058, Linkage=llvm::GlobalValue::ExternalLinkage, AddrSpace=0, N="F", M=0x50287fd16f00) at external/_main~llvm_project~llvm-project/llvm/include/llvm/IR/Function.h:175
#7  0x000055555c27ebac in llvm::Function::Create (Ty=0x50287fd43058, Linkage=llvm::GlobalValue::ExternalLinkage, N="F", M=...) at external/_main~llvm_project~llvm-project/llvm/lib/IR/Function.cpp:398
#8  0x0000555558ce7bb5 in Carbon::Lower::FileContext::BuildFunctionDecl (this=0x7fffffffc438, function_id=...) at toolchain/lower/file_context.cpp:257
```

That's where LLVM decides to make a new name (name.number) when asked to
create a new global with the same name as an existing global.

It's not a valid mangling scheme - since the name won't be stable
between different compilations, but it is enough to make
single-compilation code build/run for now.
2024-08-28 19:18:54 +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
//
// AUTOUPDATE
// TIP: To test this file alone, run:
// TIP: bazel test //toolchain/testing:file_test --test_arg=--file_tests=toolchain/lower/testdata/array/function_param.carbon
// TIP: To dump output, run:
// TIP: bazel run //toolchain/testing:file_test -- --dump_output --file_tests=toolchain/lower/testdata/array/function_param.carbon
fn F(arr: [i32; 3], i: i32) -> i32 {
return arr[i];
}
fn G() -> i32 {
return F((1, 2, 3), 1);
}
// CHECK:STDOUT: ; ModuleID = 'function_param.carbon'
// CHECK:STDOUT: source_filename = "function_param.carbon"
// CHECK:STDOUT:
// CHECK:STDOUT: @array.loc16_11.1 = internal constant [3 x i32] [i32 1, i32 2, i32 3]
// CHECK:STDOUT:
// CHECK:STDOUT: define i32 @F(ptr %arr, i32 %i) !dbg !4 {
// CHECK:STDOUT: entry:
// CHECK:STDOUT: %.loc12_15.2.array.index = getelementptr inbounds [3 x i32], ptr %arr, i32 0, i32 %i, !dbg !7
// CHECK:STDOUT: %.loc12_15.3 = load i32, ptr %.loc12_15.2.array.index, align 4, !dbg !7
// CHECK:STDOUT: ret i32 %.loc12_15.3, !dbg !8
// CHECK:STDOUT: }
// CHECK:STDOUT:
// CHECK:STDOUT: define i32 @G() !dbg !9 {
// CHECK:STDOUT: entry:
// CHECK:STDOUT: %.loc16_20.2.temp = alloca [3 x i32], align 4, !dbg !10
// CHECK:STDOUT: %.loc16_20.4.array.index = getelementptr inbounds [3 x i32], ptr %.loc16_20.2.temp, i32 0, i32 0, !dbg !10
// CHECK:STDOUT: %.loc16_20.7.array.index = getelementptr inbounds [3 x i32], ptr %.loc16_20.2.temp, i32 0, i32 1, !dbg !10
// CHECK:STDOUT: %.loc16_20.10.array.index = getelementptr inbounds [3 x i32], ptr %.loc16_20.2.temp, i32 0, i32 2, !dbg !10
// CHECK:STDOUT: call void @llvm.memcpy.p0.p0.i64(ptr align 4 %.loc16_20.2.temp, ptr align 4 @array.loc16_11.1, i64 12, i1 false), !dbg !11
// CHECK:STDOUT: %F.call = call i32 @F(ptr %.loc16_20.2.temp, i32 1), !dbg !11
// CHECK:STDOUT: ret i32 %F.call, !dbg !12
// CHECK:STDOUT: }
// CHECK:STDOUT:
// CHECK:STDOUT: ; Function Attrs: nocallback nofree nounwind willreturn memory(argmem: readwrite)
// CHECK:STDOUT: declare void @llvm.memcpy.p0.p0.i64(ptr noalias nocapture writeonly, ptr noalias nocapture readonly, i64, i1 immarg) #0
// CHECK:STDOUT:
// CHECK:STDOUT: attributes #0 = { nocallback nofree 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, file: !3, producer: "carbon", isOptimized: false, runtimeVersion: 0, emissionKind: FullDebug)
// CHECK:STDOUT: !3 = !DIFile(filename: "function_param.carbon", directory: "")
// CHECK:STDOUT: !4 = distinct !DISubprogram(name: "F", linkageName: "F", scope: null, file: !3, line: 11, type: !5, spFlags: DISPFlagDefinition, unit: !2)
// CHECK:STDOUT: !5 = !DISubroutineType(types: !6)
// CHECK:STDOUT: !6 = !{}
// CHECK:STDOUT: !7 = !DILocation(line: 12, column: 10, scope: !4)
// CHECK:STDOUT: !8 = !DILocation(line: 12, column: 3, scope: !4)
// CHECK:STDOUT: !9 = distinct !DISubprogram(name: "G", linkageName: "G", scope: null, file: !3, line: 15, type: !5, spFlags: DISPFlagDefinition, unit: !2)
// CHECK:STDOUT: !10 = !DILocation(line: 16, column: 12, scope: !9)
// CHECK:STDOUT: !11 = !DILocation(line: 16, column: 10, scope: !9)
// CHECK:STDOUT: !12 = !DILocation(line: 16, column: 3, scope: !9)
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