Support multiple COFF sections with the same name but different COMDAT.

This is the first step to fix pr17918.

It extends the .section directive a bit, inspired by what the ELF one looks
like. The problem with using linkonce is that given

.section foo
.linkonce....

.section foo
.linkonce

we would already have switched sections when getting to .linkonce. The cleanest
solution seems to be to add the comdat information in the .section itself.

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@195148 91177308-0d34-0410-b5e6-96231b3b80d8

1 files changed, 188 insertions, 0 deletions

diff --git a/test/MC/COFF/section-comdat.s b/test/MC/COFF/section-comdat.s
new file mode 100644
index 0000000000..dd5be871b0
--- /dev/null
+++ b/test/MC/COFF/section-comdat.s
@@ -0,0 +1,188 @@
+// RUN: llvm-mc -triple i386-pc-win32 -filetype=obj %s | llvm-readobj -s -t | FileCheck %s
+// RUN: llvm-mc -triple x86_64-pc-win32 -filetype=obj %s | llvm-readobj -s -t | FileCheck %s
+
+.section assocSec
+.linkonce
+.long 1
+
+.section secName, "dr", discard, "Symbol1"
+.globl Symbol1
+Symbol1:
+.long 1
+
+.section secName, "dr", one_only, "Symbol2"
+.globl Symbol2
+Symbol2:
+.long 1
+
+.section SecName, "dr", same_size, "Symbol3"
+.globl Symbol3
+Symbol3:
+.long 1
+
+.section SecName, "dr", same_contents, "Symbol4"
+.globl Symbol4
+Symbol4:
+.long 1
+
+.section SecName, "dr", associative assocSec, "Symbol5"
+.globl Symbol5
+Symbol5:
+.long 1
+
+.section SecName, "dr", largest, "Symbol6"
+.globl Symbol6
+Symbol6:
+.long 1
+
+.section SecName, "dr", newest, "Symbol7"
+.globl Symbol7
+Symbol7:
+.long 1
+
+// CHECK: Sections [
+// CHECK:   Section {
+// CHECK:     Number: 1
+// CHECK:     Name: assocSec
+// CHECK:     Characteristics [
+// CHECK:       IMAGE_SCN_LNK_COMDAT
+// CHECK:     ]
+// CHECK:   }
+// CHECK:   Section {
+// CHECK:     Number: 2
+// CHECK:     Name: secName
+// CHECK:     Characteristics [
+// CHECK:       IMAGE_SCN_LNK_COMDAT
+// CHECK:     ]
+// CHECK:   }
+// CHECK:   Section {
+// CHECK:     Number: 3
+// CHECK:     Name: secName
+// CHECK:     Characteristics [
+// CHECK:       IMAGE_SCN_LNK_COMDAT
+// CHECK:     ]
+// CHECK:   }
+// CHECK:   Section {
+// CHECK:     Number: 4
+// CHECK:     Name: SecName
+// CHECK:     Characteristics [
+// CHECK:       IMAGE_SCN_LNK_COMDAT
+// CHECK:     ]
+// CHECK:   }
+// CHECK:   Section {
+// CHECK:     Number: 5
+// CHECK:     Name: SecName
+// CHECK:     Characteristics [
+// CHECK:       IMAGE_SCN_LNK_COMDAT
+// CHECK:     ]
+// CHECK:   }
+// CHECK:   Section {
+// CHECK:     Number: 6
+// CHECK:     Name: SecName
+// CHECK:     Characteristics [
+// CHECK:       IMAGE_SCN_LNK_COMDAT
+// CHECK:     ]
+// CHECK:   }
+// CHECK:   Section {
+// CHECK:     Number: 7
+// CHECK:     Name: SecName
+// CHECK:     Characteristics [
+// CHECK:       IMAGE_SCN_LNK_COMDAT
+// CHECK:     ]
+// CHECK:   }
+// CHECK:   Section {
+// CHECK:     Number: 8
+// CHECK:     Name: SecName
+// CHECK:     Characteristics [
+// CHECK:       IMAGE_SCN_LNK_COMDAT
+// CHECK:     ]
+// CHECK:   }
+// CHECK: ]
+// CHECK: Symbols [
+// CHECK:   Symbol {
+// CHECK:     Name: assocSec
+// CHECK:     Section: assocSec (1)
+// CHECK:     AuxSectionDef {
+// CHECK:       Selection: Any
+// CHECK:     }
+// CHECK:   }
+// CHECK:   Symbol {
+// CHECK:     Name: secName
+// CHECK:     Section: secName (2)
+// CHECK:     AuxSectionDef {
+// CHECK:       Selection: Any
+// CHECK:     }
+// CHECK:   }
+// CHECK:   Symbol {
+// CHECK:     Name: secName
+// CHECK:     Section: secName (3)
+// CHECK:     AuxSectionDef {
+// CHECK:       Selection: NoDuplicates
+// CHECK:     }
+// CHECK:   }
+// CHECK:   Symbol {
+// CHECK:     Name: SecName
+// CHECK:     Section: SecName (4)
+// CHECK:     AuxSectionDef {
+// CHECK:       Selection: SameSize
+// CHECK:     }
+// CHECK:   }
+// CHECK:   Symbol {
+// CHECK:     Name: SecName
+// CHECK:     Section: SecName (5)
+// CHECK:     AuxSymbolCount: 1
+// CHECK:     AuxSectionDef {
+// CHECK:       Selection: ExactMatch
+// CHECK:     }
+// CHECK:   }
+// CHECK:   Symbol {
+// CHECK:     Name: SecName
+// CHECK:     Section: SecName (6)
+// CHECK:     AuxSectionDef {
+// CHECK:       Selection: Associative
+// CHECK:       AssocSection: assocSec (1)
+// CHECK:     }
+// CHECK:   }
+// CHECK:   Symbol {
+// CHECK:     Name: SecName
+// CHECK:     Section: SecName (7)
+// CHECK:     AuxSectionDef {
+// CHECK:       Selection: Largest
+// CHECK:     }
+// CHECK:   }
+// CHECK:   Symbol {
+// CHECK:     Name: SecName
+// CHECK:     Section: SecName (8)
+// CHECK:     AuxSectionDef {
+// CHECK:       Selection: Newest (0x7)
+// CHECK:     }
+// CHECK:   }
+// CHECK:   Symbol {
+// CHECK:     Name: Symbol1
+// CHECK:     Section: secName (2)
+// CHECK:   }
+// CHECK:   Symbol {
+// CHECK:     Name: Symbol2
+// CHECK:     Section: secName (3)
+// CHECK:   }
+// CHECK:   Symbol {
+// CHECK:     Name: Symbol3
+// CHECK:     Section: SecName (4)
+// CHECK:   }
+// CHECK:   Symbol {
+// CHECK:     Name: Symbol4
+// CHECK:     Section: SecName (5)
+// CHECK:   }
+// CHECK:   Symbol {
+// CHECK:     Name: Symbol5
+// CHECK:     Section: SecName (6)
+// CHECK:   }
+// CHECK:   Symbol {
+// CHECK:     Name: Symbol6
+// CHECK:     Section: SecName (7)
+// CHECK:   }
+// CHECK:   Symbol {
+// CHECK:     Name: Symbol7
+// CHECK:     Section: SecName (8)
+// CHECK:   }
+// CHECK: ]