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67b287a2f27a2ad0ac64e8af10c39338d9e24af8
carbon-lang/toolchain/lower/testdata/pointer/pointer_to_pointer.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/pointer/pointer_to_pointer.carbon
// TIP: To dump output, run:
// TIP: bazel run //toolchain/testing:file_test -- --dump_output --file_tests=toolchain/lower/testdata/pointer/pointer_to_pointer.carbon
fn F(p: i32**) -> i32 {
var a: i32** = p;
var b: i32* = *p;
var c: i32** = &b;
return **c;
}
// CHECK:STDOUT: ; ModuleID = 'pointer_to_pointer.carbon'
// CHECK:STDOUT: source_filename = "pointer_to_pointer.carbon"
// CHECK:STDOUT:
// CHECK:STDOUT: define i32 @F(ptr %p) !dbg !4 {
// CHECK:STDOUT: entry:
// CHECK:STDOUT: %a.var = alloca ptr, align 8, !dbg !7
// CHECK:STDOUT: store ptr %p, ptr %a.var, align 8, !dbg !8
// CHECK:STDOUT: %b.var = alloca ptr, align 8, !dbg !9
// CHECK:STDOUT: %.loc13_17.2 = load ptr, ptr %p, align 8, !dbg !10
// CHECK:STDOUT: store ptr %.loc13_17.2, ptr %b.var, align 8, !dbg !11
// CHECK:STDOUT: %c.var = alloca ptr, align 8, !dbg !12
// CHECK:STDOUT: store ptr %b.var, ptr %c.var, align 8, !dbg !13
// CHECK:STDOUT: %.loc15_12 = load ptr, ptr %c.var, align 8, !dbg !14
// CHECK:STDOUT: %.loc15_11.2 = load ptr, ptr %.loc15_12, align 8, !dbg !15
// CHECK:STDOUT: %.loc15_10.2 = load i32, ptr %.loc15_11.2, align 4, !dbg !16
// CHECK:STDOUT: ret i32 %.loc15_10.2, !dbg !17
// CHECK:STDOUT: }
// 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: "pointer_to_pointer.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: 7, scope: !4)
// CHECK:STDOUT: !8 = !DILocation(line: 12, column: 3, scope: !4)
// CHECK:STDOUT: !9 = !DILocation(line: 13, column: 7, scope: !4)
// CHECK:STDOUT: !10 = !DILocation(line: 13, column: 17, scope: !4)
// CHECK:STDOUT: !11 = !DILocation(line: 13, column: 3, scope: !4)
// CHECK:STDOUT: !12 = !DILocation(line: 14, column: 7, scope: !4)
// CHECK:STDOUT: !13 = !DILocation(line: 14, column: 3, scope: !4)
// CHECK:STDOUT: !14 = !DILocation(line: 15, column: 12, scope: !4)
// CHECK:STDOUT: !15 = !DILocation(line: 15, column: 11, scope: !4)
// CHECK:STDOUT: !16 = !DILocation(line: 15, column: 10, scope: !4)
// CHECK:STDOUT: !17 = !DILocation(line: 15, column: 3, scope: !4)
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