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Introduce MCCodeGenInfo, which keeps information that can affect codegen

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(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
This commit is contained in:
Evan Cheng
2011-07-19 06:37:02 +00:00
parent 939ece1b5c
commit 439661395f
74 changed files with 641 additions and 314 deletions
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47
lib/Target/X86/MCTargetDesc/X86MCTargetDesc.cpp
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@@ -338,3 +338,50 @@ extern "C" void LLVMInitializeX86MCAsmInfo() {
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);
}