MC: support passing search paths to the IAS

This is needed to support inclusion in inline assembly via the
`.include` directive.

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@291085 91177308-0d34-0410-b5e6-96231b3b80d8

Author: compnerd

include/llvm/MC/MCTargetOptions.h

@@ -11,6 +11,7 @@
 #define LLVM_MC_MCTARGETOPTIONS_H
 
 #include <string>
+#include <vector>
 
 namespace llvm {
 
@@ -51,11 +52,17 @@ class MCTargetOptions {
   bool PreserveAsmComments : 1;
 
   int DwarfVersion;
+
   /// getABIName - If this returns a non-empty string this represents the
   /// textual name of the ABI that we want the backend to use, e.g. o32, or
   /// aapcs-linux.
   StringRef getABIName() const;
   std::string ABIName;
+
+  /// Additional paths to search for `.include` directives when using the
+  /// integrated assembler.
+  std::vector<std::string> IASSearchPaths;
+
   MCTargetOptions();
 };
 
@@ -75,7 +82,8 @@ inline bool operator==(const MCTargetOptions &LHS, const MCTargetOptions &RHS) {
           ARE_EQUAL(ShowMCInst) &&
           ARE_EQUAL(AsmVerbose) &&
           ARE_EQUAL(DwarfVersion) &&
-          ARE_EQUAL(ABIName));
+          ARE_EQUAL(ABIName) &&
+          ARE_EQUAL(IASSearchPaths));
 #undef ARE_EQUAL
 }
 

lib/CodeGen/AsmPrinter/AsmPrinterInlineAsm.cpp

@@ -100,6 +100,8 @@ void AsmPrinter::EmitInlineAsm(StringRef Str, const MCSubtargetInfo &STI,
   }
 
   SourceMgr SrcMgr;
+  SrcMgr.setIncludeDirs(MCOptions.IASSearchPaths);
+
   SrcMgrDiagInfo DiagInfo;
 
   // If the current LLVMContext has an inline asm handler, set it in SourceMgr.

test/MC/AsmParser/include.ll

@@ -0,0 +1,13 @@
+; RUN: llc -mtriple thumbv7--- -I %p/include -filetype asm -o - %s | FileCheck %s
+
+module asm ".include \22module.x\22"
+
+define arm_aapcscc void @f() {
+entry:
+  call void asm sideeffect ".include \22function.x\22", ""()
+  ret void
+}
+
+; CHECK: MODULE = 1
+; CHECK: FUNCTION = 1
+

test/MC/AsmParser/include/function.x

@@ -0,0 +1,3 @@
+
+FUNCTION = 1
+

test/MC/AsmParser/include/module.x

@@ -0,0 +1,3 @@
+
+MODULE = 1
+

tools/llc/llc.cpp

@@ -134,6 +134,8 @@ static cl::opt<std::string> StartAfter("start-after",
     cl::desc("Resume compilation after a specific pass"),
     cl::value_desc("pass-name"), cl::init(""));
 
+static cl::list<std::string> IncludeDirs("I", cl::desc("include search path"));
+
 namespace {
 static ManagedStatic<std::vector<std::string>> RunPassNames;
 
@@ -398,6 +400,7 @@ static int compileModule(char **argv, LLVMContext &Context) {
   Options.MCOptions.MCUseDwarfDirectory = EnableDwarfDirectory;
   Options.MCOptions.AsmVerbose = AsmVerbose;
   Options.MCOptions.PreserveAsmComments = PreserveComments;
+  Options.MCOptions.IASSearchPaths = IncludeDirs;
 
   std::unique_ptr<TargetMachine> Target(
       TheTarget->createTargetMachine(TheTriple.getTriple(), CPUStr, FeaturesStr,