Don't stomp the triple when loading a PECOFF target.

When you create a target, it tries to look for the platform's list
of supported architectures for a match.  The match it finds can
contain specific triples, like i386-pc-windows-msvc.  Later, we
overwrite this value with the most generic triple that can apply
to any platform with COFF support, causing some of the fields of
the triple to get overwritten.

This patch changes the behavior to only merge in values from the COFF
triple if the fields of the matching triple were unknown/unspecified
to begin with.

This fixes load address resolution on Windows, since it enables the
DynamicLoaderWindows to be used instead of DynamicLoaderStatic.

Reviewed by: Greg Clayton
Differential Revision: http://reviews.llvm.org/D7120

llvm-svn: 226849

diff --git a/lldb/include/lldb/Core/ArchSpec.h b/lldb/include/lldb/Core/ArchSpec.h
index 694e204..93630f0 100644 (file)
--- a/lldb/include/lldb/Core/ArchSpec.h
+++ b/lldb/include/lldb/Core/ArchSpec.h
@@ -277,6 +277,21 @@ public:
     }
 
     //------------------------------------------------------------------
+    /// Merges fields from another ArchSpec into this ArchSpec.
+    ///
+    /// This will use the supplied ArchSpec to fill in any fields of
+    /// the triple in this ArchSpec which were unspecified.  This can
+    /// be used to refine a generic ArchSpec with a more specific one.
+    /// For example, if this ArchSpec's triple is something like
+    /// i386-unknown-unknown-unknown, and we have a triple which is
+    /// x64-pc-windows-msvc, then merging that triple into this one
+    /// will result in the triple i386-pc-windows-msvc.
+    ///
+    //------------------------------------------------------------------
+    void
+    MergeFrom(const ArchSpec &other);
+
+    //------------------------------------------------------------------
     /// Sets this ArchSpec according to the given architecture name.
     ///
     /// The architecture name can be one of the generic system default

diff --git a/lldb/source/Core/ArchSpec.cpp b/lldb/source/Core/ArchSpec.cpp
index e7a5e48..015f76b 100644 (file)
--- a/lldb/source/Core/ArchSpec.cpp
+++ b/lldb/source/Core/ArchSpec.cpp
@@ -765,6 +765,19 @@ ArchSpec::SetTriple (const char *triple_cstr, Platform *platform)
     return IsValid();
 }
 
+void
+ArchSpec::MergeFrom(const ArchSpec &other)
+{
+    if (GetTriple().getVendor() == llvm::Triple::UnknownVendor && !TripleVendorWasSpecified())
+        GetTriple().setVendor(other.GetTriple().getVendor());
+    if (GetTriple().getOS() == llvm::Triple::UnknownOS && !TripleOSWasSpecified())
+        GetTriple().setOS(other.GetTriple().getOS());
+    if (GetTriple().getArch() == llvm::Triple::UnknownArch)
+        GetTriple().setArch(other.GetTriple().getArch());
+    if (GetTriple().getEnvironment() == llvm::Triple::UnknownEnvironment)
+        GetTriple().setEnvironment(other.GetTriple().getEnvironment());
+}
+
 bool
 ArchSpec::SetArchitecture (ArchitectureType arch_type, uint32_t cpu, uint32_t sub)
 {

diff --git a/lldb/source/Core/Module.cpp b/lldb/source/Core/Module.cpp
index 900eea2..d38d403 100644 (file)
--- a/lldb/source/Core/Module.cpp
+++ b/lldb/source/Core/Module.cpp
@@ -1304,10 +1304,14 @@ Module::GetObjectFile()
                                                    data_offset);
             if (m_objfile_sp)
             {
-                // Once we get the object file, update our module with the object file's 
+                // Once we get the object file, update our module with the object file's
                 // architecture since it might differ in vendor/os if some parts were
-                // unknown.
-                m_objfile_sp->GetArchitecture (m_arch);
+                // unknown.  But since the matching arch might already be more specific
+                // than the generic COFF architecture, only merge in those values that
+                // overwrite unspecified unknown values.
+                ArchSpec new_arch;
+                m_objfile_sp->GetArchitecture(new_arch);
+                m_arch.MergeFrom(new_arch);
             }
             else
             {

diff --git a/lldb/source/Plugins/ObjectFile/PECOFF/ObjectFilePECOFF.cpp b/lldb/source/Plugins/ObjectFile/PECOFF/ObjectFilePECOFF.cpp
index 4f9ed2e..6defd64 100644 (file)
--- a/lldb/source/Plugins/ObjectFile/PECOFF/ObjectFilePECOFF.cpp
+++ b/lldb/source/Plugins/ObjectFile/PECOFF/ObjectFilePECOFF.cpp
@@ -130,10 +130,17 @@ ObjectFilePECOFF::GetModuleSpecifications (const lldb_private::FileSpec& file,
             {
                 ArchSpec spec;
                 if (coff_header.machine == MachineAmd64)
+                {
                     spec.SetTriple("x86_64-pc-windows");
+                    specs.Append(ModuleSpec(file, spec));
+                }
                 else if (coff_header.machine == MachineX86)
+                {
                     spec.SetTriple("i386-pc-windows");
-                specs.Append(ModuleSpec(file, spec));
+                    specs.Append(ModuleSpec(file, spec));
+                    spec.SetTriple("i686-pc-windows");
+                    specs.Append(ModuleSpec(file, spec));
+                }
             }
         }
     }