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Rudimentary name mangling support (#4267)

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This seems to be enough to avoid naming collisions for functions in any
of the current test cases (verified by asserting that the name of the
`llvm::Function` matches the name passed to create it - not triggering
LLVM's numbering that happens when names collide)

It currently implements mangling for namespace scopes, class scopes, and
impls.
Nothing generic is mangled yet - haven't looked at how that works,
though evidently it's not covered by existing testing, I guess.

Follow-up change will document the current mangling algorithm in
`toolchain/docs/lower.md`

---------

Co-authored-by: Jon Ross-Perkins <jperkins@google.com>
Co-authored-by: Carbon Infra Bot <carbon-external-infra@google.com>
This commit is contained in:
David Blaikie
2024-09-06 23:10:21 +00:00
committed by GitHub
co-authored by Jon Ross-Perkins Carbon Infra Bot
parent 49f2136325
commit a548eff0bb
94 changed files with 657 additions and 498 deletions
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toolchain/lower/testdata/debug/nodebug.carbon
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+1 -1
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@@ -16,7 +16,7 @@ fn F() {
// CHECK:STDOUT: ; ModuleID = 'nodebug.carbon'
// CHECK:STDOUT: source_filename = "nodebug.carbon"
// CHECK:STDOUT:
// CHECK:STDOUT: define void @F() {
// CHECK:STDOUT: define void @_CF.Main() {
// CHECK:STDOUT: entry:
// CHECK:STDOUT: ret void
// CHECK:STDOUT: }