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Summary: We can sometimes end up with multiple copies of a local function that have the same GUID in the index. This happens when there are local functions with the same name that are in different source files with the same name (but in different directories), and they were compiled in their own directory so had the same path at compile time. In this case make sure we import the copy in the caller's module. While it isn't a correctness problem (the renamed reference which is based on the module IR hash will be unique since the module must have had an externally visible function that was imported), importing the wrong copy will result in lost performance opportunity since it won't be referenced and inlined. Reviewers: mehdi_amini Subscribers: llvm-commits Differential Revision: https://reviews.llvm.org/D28440 llvm-svn: 291841
41 lines
1.8 KiB
LLVM
41 lines
1.8 KiB
LLVM
; Test handling when two files with the same source file name contain
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; static functions with the same name (which will have the same GUID
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; in the combined index.
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; Do setup work for all below tests: generate bitcode and combined index
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; RUN: opt -module-summary -module-hash %s -o %t.bc
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; RUN: opt -module-summary -module-hash %p/Inputs/local_name_conflict1.ll -o %t2.bc
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; RUN: opt -module-summary -module-hash %p/Inputs/local_name_conflict2.ll -o %t3.bc
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; RUN: llvm-lto -thinlto-action=thinlink -o %t4.bc %t.bc %t2.bc %t3.bc
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; This module will import b() which should cause the copy of foo from
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; that module (%t3.bc) to be imported. Check that the imported reference's
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; promoted name matches the imported copy.
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; RUN: llvm-lto -thinlto-action=import %t.bc -thinlto-index=%t4.bc -o - | llvm-dis -o - | FileCheck %s --check-prefix=IMPORT
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; IMPORT: call i32 @foo.llvm.[[HASH:[0-9A-F]+]]
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; IMPORT: define available_externally hidden i32 @foo.llvm.[[HASH]]()
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; The copy in %t2.bc should not be exported/promoted/renamed
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; RUN: llvm-lto -thinlto-action=promote %t2.bc -thinlto-index=%t4.bc -o - | llvm-dis -o - | FileCheck %s --check-prefix=NOEXPORTSTATIC
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; NOEXPORTSTATIC: define internal i32 @foo()
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; Make sure foo is promoted and renamed without complaint in %t3.bc.
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; RUN: llvm-lto -thinlto-action=promote %t3.bc -thinlto-index=%t4.bc -o - | llvm-dis -o - | FileCheck %s --check-prefix=EXPORTSTATIC
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; EXPORTSTATIC: define hidden i32 @foo.llvm.
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; ModuleID = 'local_name_conflict_main.o'
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source_filename = "local_name_conflict_main.c"
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target datalayout = "e-m:e-i64:64-f80:128-n8:16:32:64-S128"
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target triple = "x86_64-unknown-linux-gnu"
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; Function Attrs: noinline nounwind uwtable
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define i32 @main() {
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entry:
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%retval = alloca i32, align 4
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store i32 0, i32* %retval, align 4
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%call = call i32 (...) @b()
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ret i32 %call
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}
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declare i32 @b(...)
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