Object: Add support for bigobj

This adds support for reading the "bigobj" variant of COFF produced by
cl's /bigobj and mingw's -mbig-obj.

The most significant difference that bigobj brings is more than 2**16
sections to COFF.

bigobj brings a few interesting differences with it:
- It doesn't have a Characteristics field in the file header.
- It doesn't have a SizeOfOptionalHeader field in the file header (it's
  only used in executable files).
- Auxiliary symbol records have the same width as a symbol table entry.
  Since symbol table entries are bigger, so are auxiliary symbol
  records.

Write support will come soon.

Differential Revision: http://reviews.llvm.org/D5259

llvm-svn: 217496

6 files changed, 144 insertions, 9 deletions

diff --git a/llvm/test/tools/llvm-readobj/Inputs/bigobj.coff-x86-64 b/llvm/test/tools/llvm-readobj/Inputs/bigobj.coff-x86-64
new file mode 100644
index 00000000000..fdfda5e5713
--- /dev/null
+++ b/llvm/test/tools/llvm-readobj/Inputs/bigobj.coff-x86-64
diff --git a/llvm/test/tools/llvm-readobj/bigobj.test b/llvm/test/tools/llvm-readobj/bigobj.test
new file mode 100644
index 00000000000..361a9e44fe6
--- /dev/null
+++ b/llvm/test/tools/llvm-readobj/bigobj.test
@@ -0,0 +1,139 @@
+RUN: llvm-readobj --file-headers --sections --symbols --relocations %p/Inputs/bigobj.coff-x86-64 | FileCheck %s
+
+CHECK:      File: {{(.*[/\\])?}}bigobj.coff-x86-64
+CHECK-NEXT: Format: COFF-x86-64
+CHECK-NEXT: Arch: x86_64
+CHECK-NEXT: AddressSize: 64bit
+CHECK-NEXT: ImageFileHeader {
+CHECK-NEXT:   Machine: IMAGE_FILE_MACHINE_AMD64 (0x8664)
+CHECK-NEXT:   SectionCount: 3
+CHECK-NEXT:   TimeDateStamp: 1970-01-01 00:00:00 (0x0)
+CHECK-NEXT:   PointerToSymbolTable: 0xB0
+CHECK-NEXT:   SymbolCount: 8
+CHECK-NEXT:   OptionalHeaderSize: 0
+CHECK-NEXT:   Characteristics [ (0x0)
+CHECK-NEXT:   ]
+CHECK-NEXT: }
+CHECK-NEXT: Sections [
+CHECK-NEXT:   Section {
+CHECK-NEXT:     Number: 1
+CHECK-NEXT:     Name: .text (2E 74 65 78 74 00 00 00)
+CHECK-NEXT:     VirtualSize: 0x0
+CHECK-NEXT:     VirtualAddress: 0x0
+CHECK-NEXT:     RawDataSize: 0
+CHECK-NEXT:     PointerToRawData: 0x0
+CHECK-NEXT:     PointerToRelocations: 0x0
+CHECK-NEXT:     PointerToLineNumbers: 0x0
+CHECK-NEXT:     RelocationCount: 0
+CHECK-NEXT:     LineNumberCount: 0
+CHECK-NEXT:     Characteristics [ (0x60500020)
+CHECK-NEXT:       IMAGE_SCN_ALIGN_16BYTES (0x500000)
+CHECK-NEXT:       IMAGE_SCN_CNT_CODE (0x20)
+CHECK-NEXT:       IMAGE_SCN_MEM_EXECUTE (0x20000000)
+CHECK-NEXT:       IMAGE_SCN_MEM_READ (0x40000000)
+CHECK-NEXT:     ]
+CHECK-NEXT:   }
+CHECK-NEXT:   Section {
+CHECK-NEXT:     Number: 2
+CHECK-NEXT:     Name: .data (2E 64 61 74 61 00 00 00)
+CHECK-NEXT:     VirtualSize: 0x0
+CHECK-NEXT:     VirtualAddress: 0x0
+CHECK-NEXT:     RawDataSize: 0
+CHECK-NEXT:     PointerToRawData: 0x0
+CHECK-NEXT:     PointerToRelocations: 0x0
+CHECK-NEXT:     PointerToLineNumbers: 0x0
+CHECK-NEXT:     RelocationCount: 0
+CHECK-NEXT:     LineNumberCount: 0
+CHECK-NEXT:     Characteristics [ (0xC0500040)
+CHECK-NEXT:       IMAGE_SCN_ALIGN_16BYTES (0x500000)
+CHECK-NEXT:       IMAGE_SCN_CNT_INITIALIZED_DATA (0x40)
+CHECK-NEXT:       IMAGE_SCN_MEM_READ (0x40000000)
+CHECK-NEXT:       IMAGE_SCN_MEM_WRITE (0x80000000)
+CHECK-NEXT:     ]
+CHECK-NEXT:   }
+CHECK-NEXT:   Section {
+CHECK-NEXT:     Number: 3
+CHECK-NEXT:     Name: .bss (2E 62 73 73 00 00 00 00)
+CHECK-NEXT:     VirtualSize: 0x0
+CHECK-NEXT:     VirtualAddress: 0x0
+CHECK-NEXT:     RawDataSize: 0
+CHECK-NEXT:     PointerToRawData: 0x0
+CHECK-NEXT:     PointerToRelocations: 0x0
+CHECK-NEXT:     PointerToLineNumbers: 0x0
+CHECK-NEXT:     RelocationCount: 0
+CHECK-NEXT:     LineNumberCount: 0
+CHECK-NEXT:     Characteristics [ (0xC0500080)
+CHECK-NEXT:       IMAGE_SCN_ALIGN_16BYTES (0x500000)
+CHECK-NEXT:       IMAGE_SCN_CNT_UNINITIALIZED_DATA (0x80)
+CHECK-NEXT:       IMAGE_SCN_MEM_READ (0x40000000)
+CHECK-NEXT:       IMAGE_SCN_MEM_WRITE (0x80000000)
+CHECK-NEXT:     ]
+CHECK-NEXT:   }
+CHECK-NEXT: ]
+CHECK-NEXT: Relocations [
+CHECK-NEXT: ]
+CHECK-NEXT: Symbols [
+CHECK-NEXT:   Symbol {
+CHECK-NEXT:     Name: .file
+CHECK-NEXT:     Value: 0
+CHECK-NEXT:     Section:  (-2)
+CHECK-NEXT:     BaseType: Null (0x0)
+CHECK-NEXT:     ComplexType: Null (0x0)
+CHECK-NEXT:     StorageClass: File (0x67)
+CHECK-NEXT:     AuxSymbolCount: 1
+CHECK-NEXT:     AuxFileRecord {
+CHECK-NEXT:       FileName: fake
+CHECK-NEXT:     }
+CHECK-NEXT:   }
+CHECK-NEXT:   Symbol {
+CHECK-NEXT:     Name: .text
+CHECK-NEXT:     Value: 0
+CHECK-NEXT:     Section: .text (1)
+CHECK-NEXT:     BaseType: Null (0x0)
+CHECK-NEXT:     ComplexType: Null (0x0)
+CHECK-NEXT:     StorageClass: Static (0x3)
+CHECK-NEXT:     AuxSymbolCount: 1
+CHECK-NEXT:     AuxSectionDef {
+CHECK-NEXT:       Length: 0
+CHECK-NEXT:       RelocationCount: 0
+CHECK-NEXT:       LineNumberCount: 0
+CHECK-NEXT:       Checksum: 0x0
+CHECK-NEXT:       Number: 0
+CHECK-NEXT:       Selection: 0x0
+CHECK-NEXT:     }
+CHECK-NEXT:   }
+CHECK-NEXT:   Symbol {
+CHECK-NEXT:     Name: .data
+CHECK-NEXT:     Value: 0
+CHECK-NEXT:     Section: .data (2)
+CHECK-NEXT:     BaseType: Null (0x0)
+CHECK-NEXT:     ComplexType: Null (0x0)
+CHECK-NEXT:     StorageClass: Static (0x3)
+CHECK-NEXT:     AuxSymbolCount: 1
+CHECK-NEXT:     AuxSectionDef {
+CHECK-NEXT:       Length: 0
+CHECK-NEXT:       RelocationCount: 0
+CHECK-NEXT:       LineNumberCount: 0
+CHECK-NEXT:       Checksum: 0x0
+CHECK-NEXT:       Number: 0
+CHECK-NEXT:       Selection: 0x0
+CHECK-NEXT:     }
+CHECK-NEXT:   }
+CHECK-NEXT:   Symbol {
+CHECK-NEXT:     Name: .bss
+CHECK-NEXT:     Value: 0
+CHECK-NEXT:     Section: .bss (3)
+CHECK-NEXT:     BaseType: Null (0x0)
+CHECK-NEXT:     ComplexType: Null (0x0)
+CHECK-NEXT:     StorageClass: Static (0x3)
+CHECK-NEXT:     AuxSymbolCount: 1
+CHECK-NEXT:     AuxSectionDef {
+CHECK-NEXT:       Length: 0
+CHECK-NEXT:       RelocationCount: 0
+CHECK-NEXT:       LineNumberCount: 0
+CHECK-NEXT:       Checksum: 0x0
+CHECK-NEXT:       Number: 0
+CHECK-NEXT:       Selection: 0x0
+CHECK-NEXT:     }
+CHECK-NEXT:   }
+CHECK-NEXT: ]
diff --git a/llvm/test/tools/llvm-readobj/coff-file-sections-reading.test b/llvm/test/tools/llvm-readobj/coff-file-sections-reading.test
index 5c44c16f005..846247fd9cf 100644
--- a/llvm/test/tools/llvm-readobj/coff-file-sections-reading.test
+++ b/llvm/test/tools/llvm-readobj/coff-file-sections-reading.test
@@ -4,7 +4,7 @@ CHECK: Symbols [
 CHECK:   Symbol {
 CHECK:     Name: .file
 CHECK:     Value: 0
-CHECK:     Section:  (65534)
+CHECK:     Section:  (-2)
 CHECK:     BaseType: Null (0x0)
 CHECK:     ComplexType: Null (0x0)
 CHECK:     StorageClass: File (0x67)
diff --git a/llvm/test/tools/llvm-readobj/cxx-cli-aux.test b/llvm/test/tools/llvm-readobj/cxx-cli-aux.test
index 90e73c033a8..cac9e71c252 100644
--- a/llvm/test/tools/llvm-readobj/cxx-cli-aux.test
+++ b/llvm/test/tools/llvm-readobj/cxx-cli-aux.test
@@ -9,7 +9,7 @@ CHECK:      Symbols [
 CHECK:        Symbol {
 CHECK:          Name: ?PerAppDomain@@$$Q3HA
 CHECK-NEXT:     Value: 4
-CHECK-NEXT:     Section:  (65535)
+CHECK-NEXT:     Section:  (-1)
 CHECK-NEXT:     BaseType: Null (0x0)
 CHECK-NEXT:     ComplexType: Null (0x0)
 CHECK-NEXT:     StorageClass: External (0x2)
@@ -21,14 +21,13 @@ CHECK-NEXT:       LineNumberCount: 0
 CHECK-NEXT:       Checksum: 0x0
 CHECK-NEXT:       Number: 0
 CHECK-NEXT:       Selection: NoDuplicates (0x1)
-CHECK-NEXT:       Unused: (00 00 00)
 CHECK-NEXT:     }
 CHECK-NEXT:   }
 
 CHECK:        Symbol {
 CHECK:          Name: 04000001
 CHECK-NEXT:     Value: 4
-CHECK-NEXT:     Section:  (65535)
+CHECK-NEXT:     Section:  (-1)
 CHECK-NEXT:     BaseType: Null (0x0)
 CHECK-NEXT:     ComplexType: Null (0x0)
 CHECK-NEXT:     StorageClass: CLRToken (0x6B)
@@ -37,6 +36,5 @@ CHECK-NEXT:     AuxCLRToken {
 CHECK-NEXT:       AuxType: 1
 CHECK-NEXT:       Reserved: 0
 CHECK-NEXT:       SymbolTableIndex: ?PerAppDomain@@$$Q3HA (19)
-CHECK-NEXT:       Unused: (00 00 00 00 00 00 00 00 00 00 00 00)
 CHECK-NEXT:     }
 CHECK-NEXT:   }
diff --git a/llvm/test/tools/llvm-readobj/sections-ext.test b/llvm/test/tools/llvm-readobj/sections-ext.test
index 972d8e6f4ef..4024878d2bd 100644
--- a/llvm/test/tools/llvm-readobj/sections-ext.test
+++ b/llvm/test/tools/llvm-readobj/sections-ext.test
@@ -52,7 +52,6 @@ COFF-NEXT:           LineNumberCount: 0
 COFF-NEXT:           Checksum: 0x0
 COFF-NEXT:           Number: 1
 COFF-NEXT:           Selection: 0x0
-COFF-NEXT:           Unused: (00 00 00)
 COFF-NEXT:         }
 COFF-NEXT:       }
 COFF-NEXT:       Symbol {
diff --git a/llvm/test/tools/llvm-readobj/symbols.test b/llvm/test/tools/llvm-readobj/symbols.test
index 26830ac46a8..3876138f9d2 100644
--- a/llvm/test/tools/llvm-readobj/symbols.test
+++ b/llvm/test/tools/llvm-readobj/symbols.test
@@ -7,7 +7,7 @@ COFF:      Symbols [
 COFF-NEXT:   Symbol {
 COFF-NEXT:     Name: @comp.id
 COFF-NEXT:    Value: 14766605
-COFF-NEXT:    Section:  (65535)
+COFF-NEXT:    Section:  (-1)
 COFF-NEXT:     BaseType: Null (0x0)
 COFF-NEXT:     ComplexType: Null (0x0)
 COFF-NEXT:    StorageClass: Static (0x3)
@@ -16,7 +16,7 @@ COFF-NEXT:   }
 COFF-NEXT:   Symbol {
 COFF-NEXT:    Name: @feat.00
 COFF-NEXT:    Value: 2147484049
-COFF-NEXT:     Section:  (65535)
+COFF-NEXT:     Section:  (-1)
 COFF-NEXT:     BaseType: Null (0x0)
 COFF-NEXT:    ComplexType: Null (0x0)
 COFF-NEXT:    StorageClass: Static (0x3)
@@ -37,7 +37,6 @@ COFF-NEXT:       LineNumberCount: 0
 COFF-NEXT:       Checksum: 0x0
 COFF-NEXT:       Number: 1
 COFF-NEXT:       Selection: 0x0
-COFF-NEXT:       Unused: (00 00 00)
 COFF-NEXT:     }
 COFF-NEXT:   }