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[driver] Add a -mstrict-align compiler option for ARM targets. 

rdar://12340498

llvm-svn: 167619
This commit is contained in:
Chad Rosier 2012-11-09 17:29:19 +00:00
parent c280f41864
commit 6002702b06
5 changed files with 8 additions and 0 deletions
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2
clang/include/clang/Driver/Options.td
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@ -789,6 +789,8 @@ def mstackrealign : Flag<["-"], "mstackrealign">, Group<m_Group>, Flags<[CC1Opti
HelpText<"Force realign the stack at entry to every function.">;
def mstack_alignment : Joined<["-"], "mstack-alignment=">, Group<m_Group>, Flags<[CC1Option]>,
HelpText<"Set the stack alignment">;
def mstrict_align : Flag<["-"], "mstrict-align">, Group<m_Group>, Flags<[CC1Option]>,
HelpText<"Force all memory accesses to be aligned. (ARM only)">;
def mmmx : Flag<["-"], "mmmx">, Group<m_x86_Features_Group>;
def mno_3dnowa : Flag<["-"], "mno-3dnowa">, Group<m_x86_Features_Group>;
def mno_3dnow : Flag<["-"], "mno-3dnow">, Group<m_x86_Features_Group>;

1
clang/include/clang/Frontend/CodeGenOptions.def
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@ -100,6 +100,7 @@ CODEGENOPT(VerifyModule , 1, 1) ///< Control whether the module should be r
CODEGENOPT(StackRealignment , 1, 0) ///< Control whether to permit stack
///< realignment.
CODEGENOPT(StrictAlign , 1, 0) ///< Force all memory accesses to be aligned.
CODEGENOPT(UseInitArray , 1, 0) ///< Control whether to use .init_array or
///< .ctors.
VALUE_CODEGENOPT(StackAlignment , 32, 0) ///< Overrides default stack

1
clang/lib/CodeGen/BackendUtil.cpp
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@ -401,6 +401,7 @@ TargetMachine *EmitAssemblyHelper::CreateTargetMachine(bool MustCreateTM) {
Options.UseSoftFloat = CodeGenOpts.SoftFloat;
Options.StackAlignmentOverride = CodeGenOpts.StackAlignment;
Options.RealignStack = CodeGenOpts.StackRealignment;
Options.StrictAlign = CodeGenOpts.StrictAlign;
Options.DisableTailCalls = CodeGenOpts.DisableTailCalls;
Options.TrapFuncName = CodeGenOpts.TrapFuncName;
Options.PositionIndependentExecutable = LangOpts.PIELevel != 0;

3
clang/lib/Driver/Tools.cpp
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@ -2533,6 +2533,9 @@ void Clang::ConstructJob(Compilation &C, const JobAction &JA,
StringRef alignment = Args.getLastArgValue(options::OPT_mstack_alignment);
CmdArgs.push_back(Args.MakeArgString("-mstack-alignment=" + alignment));
}
if (Args.hasArg(options::OPT_mstrict_align)) {
CmdArgs.push_back(Args.MakeArgString("-mstrict-align"));
}
// Forward -f options with positive and negative forms; we translate
// these by hand.

1
clang/lib/Frontend/CompilerInvocation.cpp
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@ -407,6 +407,7 @@ static bool ParseCodeGenArgs(CodeGenOptions &Opts, ArgList &Args, InputKind IK,
Opts.SSPBufferSize =
Args.getLastArgIntValue(OPT_stack_protector_buffer_size, 8, Diags);
Opts.StackRealignment = Args.hasArg(OPT_mstackrealign);
Opts.StrictAlign = Args.hasArg(OPT_mstrict_align);
if (Arg *A = Args.getLastArg(OPT_mstack_alignment)) {
StringRef Val = A->getValue();
unsigned StackAlignment = Opts.StackAlignment;