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[Clang][OpenMP Offload] Create start/end symbols for the offloading entry table with a help of a linker

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Linker automatically provides __start_<section name> and __stop_<section name> symbols to satisfy unresolved references if <section name> is representable as a C identifier (see https://sourceware.org/binutils/docs/ld/Input-Section-Example.html for details). These symbols indicate the start address and end address of the output section respectively. Therefore, renaming OpenMP offload entries section name from ".omp.offloading_entries" to "omp_offloading_entries" to use this feature.

This is the first part of the patch for eliminating OpenMP linker script (please see https://reviews.llvm.org/D64943).

Differential Revision: https://reviews.llvm.org/D68070

llvm-svn: 373118
This commit is contained in:
Sergey Dmitriev
2019-09-27 20:00:51 +00:00
parent 159ef37735
commit 4b343fd84c
39 changed files with 297 additions and 317 deletions
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4
clang/test/OpenMP/target_codegen.cpp
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@@ -88,8 +88,8 @@
// TCHECK-NOT: @{{.+}} = weak constant [[ENTTY]]
// Check if offloading descriptor is created.
// CHECK: [[ENTBEGIN:@.+]] = external constant [[ENTTY]]
// CHECK: [[ENTEND:@.+]] = external constant [[ENTTY]]
// CHECK: [[ENTBEGIN:@.+]] = external hidden constant [[ENTTY]]
// CHECK: [[ENTEND:@.+]] = external hidden constant [[ENTTY]]
// CHECK: [[DEVBEGIN:@.+]] = extern_weak constant i8
// CHECK: [[DEVEND:@.+]] = extern_weak constant i8
// CHECK: [[IMAGES:@.+]] = internal unnamed_addr constant [1 x [[DEVTY]]] [{{.+}} { i8* [[DEVBEGIN]], i8* [[DEVEND]], [[ENTTY]]* [[ENTBEGIN]], [[ENTTY]]* [[ENTEND]] }], comdat($[[REGFN]])