[yaml2obj] Add new command line option -docnum.

Input YAML file might contain multiple object file definitions.
New option `-docnum` allows to specify an ordinal number (starting from 1)
of definition used for an object file generation.

Patch reviewed by Sean Silva.

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@209967 91177308-0d34-0410-b5e6-96231b3b80d8

include/llvm/Support/YAMLTraits.h

@@ -982,7 +982,7 @@ public:
   // These are only used by operator>>. They could be private
   // if those templated things could be made friends.
   bool setCurrentDocument();
-  void nextDocument();
+  bool nextDocument();
 
 private:
   llvm::SourceMgr                     SrcMgr; // must be before Strm

lib/Support/YAMLTraits.cpp

@@ -90,8 +90,8 @@ bool Input::setCurrentDocument() {
   return false;
 }
 
-void Input::nextDocument() {
-  ++DocIterator;
+bool Input::nextDocument() {
+  return ++DocIterator != Strm->end();
 }
 
 bool Input::mapTag(StringRef Tag, bool Default) {

test/Object/yaml2obj-coff-multi-doc.test

@@ -0,0 +1,91 @@
+# RUN: yaml2obj -format=coff -docnum=1 %s \
+# RUN:   | llvm-readobj -symbols - | FileCheck -check-prefix=DOC1 %s
+# RUN: yaml2obj -format=coff -docnum=2 %s \
+# RUN:   | llvm-readobj -symbols - | FileCheck -check-prefix=DOC2 %s
+# RUN: not yaml2obj -format=coff -docnum=3 %s 2>&1 \
+# RUN:   | FileCheck -check-prefix=DOC3 %s
+
+# DOC1: Name: _sym1
+# DOC2: Name: _sym2
+# DOC3: yaml2obj: Cannot find the 3rd document
+
+---
+header:
+  Machine: IMAGE_FILE_MACHINE_I386
+  Characteristics: [ IMAGE_FILE_DEBUG_STRIPPED ]
+
+sections:
+  - Name: .text
+    Alignment: 16
+    Characteristics: [ IMAGE_SCN_CNT_CODE, IMAGE_SCN_MEM_EXECUTE,
+                       IMAGE_SCN_MEM_READ ]
+    SectionData: "00000000"
+
+symbols:
+  - Name: .text
+    Value: 0
+    SectionNumber: 1
+    SimpleType: IMAGE_SYM_TYPE_NULL
+    ComplexType: IMAGE_SYM_DTYPE_NULL
+    StorageClass: IMAGE_SYM_CLASS_STATIC
+    SectionDefinition:
+      Length:          36
+      NumberOfRelocations: 3
+      NumberOfLinenumbers: 0
+      CheckSum:        0
+      Number:          1
+
+  - Name: _main
+    Value: 0
+    SectionNumber: 1
+    SimpleType: IMAGE_SYM_TYPE_NULL
+    ComplexType: IMAGE_SYM_DTYPE_FUNCTION
+    StorageClass: IMAGE_SYM_CLASS_EXTERNAL
+
+  - Name: _sym1
+    Value: 0
+    SectionNumber: 0
+    SimpleType: IMAGE_SYM_TYPE_NULL
+    ComplexType: IMAGE_SYM_DTYPE_NULL
+    StorageClass: IMAGE_SYM_CLASS_EXTERNAL
+
+---
+header:
+  Machine: IMAGE_FILE_MACHINE_I386
+  Characteristics: [ IMAGE_FILE_DEBUG_STRIPPED ]
+
+sections:
+  - Name: .text
+    Alignment: 16
+    Characteristics: [ IMAGE_SCN_CNT_CODE, IMAGE_SCN_MEM_EXECUTE,
+                       IMAGE_SCN_MEM_READ ]
+    SectionData: "00000000"
+
+symbols:
+  - Name: .text
+    Value: 0
+    SectionNumber: 1
+    SimpleType: IMAGE_SYM_TYPE_NULL
+    ComplexType: IMAGE_SYM_DTYPE_NULL
+    StorageClass: IMAGE_SYM_CLASS_STATIC
+    SectionDefinition:
+      Length:          36
+      NumberOfRelocations: 3
+      NumberOfLinenumbers: 0
+      CheckSum:        0
+      Number:          1
+
+  - Name: _main
+    Value: 0
+    SectionNumber: 1
+    SimpleType: IMAGE_SYM_TYPE_NULL
+    ComplexType: IMAGE_SYM_DTYPE_FUNCTION
+    StorageClass: IMAGE_SYM_CLASS_EXTERNAL
+
+  - Name: _sym2
+    Value: 0
+    SectionNumber: 0
+    SimpleType: IMAGE_SYM_TYPE_NULL
+    ComplexType: IMAGE_SYM_DTYPE_NULL
+    StorageClass: IMAGE_SYM_CLASS_EXTERNAL
+...

test/Object/yaml2obj-elf-multi-doc.test

@@ -0,0 +1,56 @@
+# RUN: yaml2obj -format=elf -docnum=1 %s \
+# RUN:   | llvm-readobj -symbols - | FileCheck -check-prefix=DOC1 %s
+# RUN: yaml2obj -format=elf -docnum=2 %s \
+# RUN:   | llvm-readobj -symbols - | FileCheck -check-prefix=DOC2 %s
+# RUN: not yaml2obj -format=elf -docnum=3 %s 2>&1 \
+# RUN:   | FileCheck -check-prefix=DOC3 %s
+
+# DOC1: Name: T1 (1)
+# DOC2: Name: T2 (1)
+# DOC3: yaml2obj: Cannot find the 3rd document
+
+--- !ELF
+FileHeader: !FileHeader
+  Class: ELFCLASS32
+  Data: ELFDATA2LSB
+  Type: ET_REL
+  Machine: EM_MIPS
+  Flags: [EF_MIPS_CPIC]
+
+Sections:
+- Name: .text
+  Type: SHT_PROGBITS
+  Content:  "0000000000000000"
+  AddressAlign: 16
+  Flags: [SHF_EXECINSTR, SHF_ALLOC]
+
+Symbols:
+  Global:
+    - Name: T1
+      Section: .text
+      Type: STT_FUNC
+      Value: 0x0
+      Size: 8
+
+--- !ELF
+FileHeader: !FileHeader
+  Class: ELFCLASS32
+  Data: ELFDATA2LSB
+  Type: ET_REL
+  Machine: EM_MIPS
+
+Sections:
+- Name: .text
+  Type: SHT_PROGBITS
+  Content:  "00000000"
+  AddressAlign: 16
+  Flags: [SHF_EXECINSTR, SHF_ALLOC]
+
+Symbols:
+  Global:
+    - Name: T2
+      Section: .text
+      Type: STT_FUNC
+      Value: 0x0
+      Size: 4
+...

tools/yaml2obj/yaml2coff.cpp

@@ -327,8 +327,7 @@ bool writeCOFF(COFFParser &CP, raw_ostream &OS) {
   return true;
 }
 
-int yaml2coff(llvm::raw_ostream &Out, llvm::MemoryBuffer *Buf) {
-  yaml::Input YIn(Buf->getBuffer());
+int yaml2coff(yaml::Input &YIn, raw_ostream &Out) {
   COFFYAML::Object Doc;
   YIn >> Doc;
   if (YIn.error()) {

tools/yaml2obj/yaml2elf.cpp

@@ -467,8 +467,7 @@ static bool isLittleEndian(const ELFYAML::Object &Doc) {
   return Doc.Header.Data == ELFYAML::ELF_ELFDATA(ELF::ELFDATA2LSB);
 }
 
-int yaml2elf(llvm::raw_ostream &Out, llvm::MemoryBuffer *Buf) {
-  yaml::Input YIn(Buf->getBuffer());
+int yaml2elf(yaml::Input &YIn, raw_ostream &Out) {
   ELFYAML::Object Doc;
   YIn >> Doc;
   if (YIn.error()) {

tools/yaml2obj/yaml2obj.cpp

@@ -15,6 +15,7 @@
 //===----------------------------------------------------------------------===//
 
 #include "yaml2obj.h"
+#include "llvm/ADT/StringExtras.h"
 #include "llvm/Support/CommandLine.h"
 #include "llvm/Support/FileSystem.h"
 #include "llvm/Support/ManagedStatic.h"
@@ -24,6 +25,7 @@
 #include "llvm/Support/raw_ostream.h"
 #include "llvm/Support/system_error.h"
 #include "llvm/Support/ToolOutputFile.h"
+#include "llvm/Support/YAMLTraits.h"
 
 using namespace llvm;
 
@@ -51,9 +53,27 @@ cl::opt<YAMLObjectFormat> Format(
     clEnumValN(YOF_ELF, "elf", "ELF object file format"),
   clEnumValEnd));
 
+cl::opt<unsigned>
+DocNum("docnum", cl::init(1),
+       cl::desc("Read specified document from input (default = 1)"));
+
 static cl::opt<std::string> OutputFilename("o", cl::desc("Output filename"),
                                            cl::value_desc("filename"));
 
+typedef int (*ConvertFuncPtr)(yaml::Input & YIn, raw_ostream &Out);
+
+int convertYAML(yaml::Input & YIn, raw_ostream &Out, ConvertFuncPtr Convert) {
+  unsigned CurDocNum = 0;
+  do {
+    if (++CurDocNum == DocNum)
+      return Convert(YIn, Out);
+  } while (YIn.nextDocument());
+
+  errs() << "yaml2obj: Cannot find the " << DocNum
+         << llvm::getOrdinalSuffix(DocNum) << " document\n";
+  return 1;
+}
+
 int main(int argc, char **argv) {
   cl::ParseCommandLineOptions(argc, argv);
   sys::PrintStackTraceOnErrorSignal();
@@ -75,14 +95,19 @@ int main(int argc, char **argv) {
   if (MemoryBuffer::getFileOrSTDIN(Input, Buf))
     return 1;
 
-  int Res = 1;
+  ConvertFuncPtr Convert = nullptr;
   if (Format == YOF_COFF)
-    Res = yaml2coff(Out->os(), Buf.get());
+    Convert = yaml2coff;
   else if (Format == YOF_ELF)
-    Res = yaml2elf(Out->os(), Buf.get());
-  else
+    Convert = yaml2elf;
+  else {
     errs() << "Not yet implemented\n";
+    return 1;
+  }
 
+  yaml::Input YIn(Buf->getBuffer());
+
+  int Res = convertYAML(YIn, Out->os(), Convert);
   if (Res == 0)
     Out->keep();
 

tools/yaml2obj/yaml2obj.h

@@ -13,10 +13,12 @@
 #define LLVM_TOOLS_YAML2OBJ_H
 
 namespace llvm {
-  class raw_ostream;
-  class MemoryBuffer;
+class raw_ostream;
+namespace yaml {
+class Input;
 }
-int yaml2coff(llvm::raw_ostream &Out, llvm::MemoryBuffer *Buf);
-int yaml2elf(llvm::raw_ostream &Out, llvm::MemoryBuffer *Buf);
+}
+int yaml2coff(llvm::yaml::Input &YIn, llvm::raw_ostream &Out);
+int yaml2elf(llvm::yaml::Input &YIn, llvm::raw_ostream &Out);
 
 #endif