Introduce MCCodeGenInfo, which keeps information that can affect codegen
(including compilation, assembly). Move relocation model Reloc::Model from
TargetMachine to MCCodeGenInfo so it's accessible even without TargetMachine.
git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@135468 91177308-0d34-0410-b5e6-96231b3b80d8
diff --git a/lib/Target/X86/MCTargetDesc/X86MCTargetDesc.cpp b/lib/Target/X86/MCTargetDesc/X86MCTargetDesc.cpp
index a60b69f..9e415a8 100644
--- a/lib/Target/X86/MCTargetDesc/X86MCTargetDesc.cpp
+++ b/lib/Target/X86/MCTargetDesc/X86MCTargetDesc.cpp
@@ -338,3 +338,50 @@
RegisterMCAsmInfoFn A(TheX86_32Target, createX86MCAsmInfo);
RegisterMCAsmInfoFn B(TheX86_64Target, createX86MCAsmInfo);
}
+
+MCCodeGenInfo *createX86MCCodeGenInfo(StringRef TT, Reloc::Model RM) {
+ MCCodeGenInfo *X = new MCCodeGenInfo();
+
+ Triple T(TT);
+ bool is64Bit = T.getArch() == Triple::x86_64;
+
+ if (RM == Reloc::Default) {
+ // Darwin defaults to PIC in 64 bit mode and dynamic-no-pic in 32 bit mode.
+ // Win64 requires rip-rel addressing, thus we force it to PIC. Otherwise we
+ // use static relocation model by default.
+ if (T.isOSDarwin()) {
+ if (is64Bit)
+ RM = Reloc::PIC_;
+ else
+ RM = Reloc::DynamicNoPIC;
+ } else if (T.isOSWindows() && is64Bit)
+ RM = Reloc::PIC_;
+ else
+ RM = Reloc::Static;
+ }
+
+ // ELF and X86-64 don't have a distinct DynamicNoPIC model. DynamicNoPIC
+ // is defined as a model for code which may be used in static or dynamic
+ // executables but not necessarily a shared library. On X86-32 we just
+ // compile in -static mode, in x86-64 we use PIC.
+ if (RM == Reloc::DynamicNoPIC) {
+ if (is64Bit)
+ RM = Reloc::PIC_;
+ else if (!T.isOSDarwin())
+ RM = Reloc::Static;
+ }
+
+ // If we are on Darwin, disallow static relocation model in X86-64 mode, since
+ // the Mach-O file format doesn't support it.
+ if (RM == Reloc::Static && T.isOSDarwin() && is64Bit)
+ RM = Reloc::PIC_;
+
+ X->InitMCCodeGenInfo(RM);
+ return X;
+}
+
+extern "C" void LLVMInitializeX86MCCodeGenInfo() {
+ // Register the target asm info.
+ RegisterMCCodeGenInfoFn A(TheX86_32Target, createX86MCCodeGenInfo);
+ RegisterMCCodeGenInfoFn B(TheX86_64Target, createX86MCCodeGenInfo);
+}