Add indirect br support to llvm-c and ocaml.

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@97376 91177308-0d34-0410-b5e6-96231b3b80d8

bindings/ocaml/llvm/llvm.ml

@@ -351,6 +351,7 @@ external const_extractvalue : llvalue -> int array -> llvalue
                             = "llvm_const_extractvalue"
 external const_insertvalue : llvalue -> llvalue -> int array -> llvalue
                            = "llvm_const_insertvalue"
+external block_address : llvalue -> llbasicblock -> llvalue = "LLVMBlockAddress"
 
 (*--... Operations on global variables, functions, and aliases (globals) ...--*)
 external global_parent : llvalue -> llmodule = "LLVMGetGlobalParent"
@@ -729,6 +730,10 @@ external build_switch : llvalue -> llbasicblock -> int -> llbuilder -> llvalue
                       = "llvm_build_switch"
 external add_case : llvalue -> llvalue -> llbasicblock -> unit
                   = "llvm_add_case"
+external build_indirect_br : llvalue -> int -> llbuilder -> llvalue
+                           = "llvm_build_indirect_br"
+external add_destination : llvalue -> llbasicblock -> unit
+                         = "llvm_add_destination"
 external build_invoke : llvalue -> llvalue array -> llbasicblock ->
                         llbasicblock -> string -> llbuilder -> llvalue
                       = "llvm_build_invoke_bc" "llvm_build_invoke_nat"

bindings/ocaml/llvm/llvm.mli

@@ -950,6 +950,10 @@ external const_extractvalue : llvalue -> int array -> llvalue
 external const_insertvalue : llvalue -> llvalue -> int array -> llvalue
                            = "llvm_const_insertvalue"
 
+(** [block_address f bb] returns the address of the basic block [bb] in the
+    function [f]. See the method [llvm::BasicBlock::get]. *)
+external block_address : llvalue -> llbasicblock -> llvalue = "LLVMBlockAddress"
+
 
 (** {7 Operations on global variables, functions, and aliases (globals)} *)
 
@@ -1562,6 +1566,20 @@ external build_switch : llvalue -> llbasicblock -> int -> llbuilder -> llvalue
 external add_case : llvalue -> llvalue -> llbasicblock -> unit
                   = "llvm_add_case"
 
+(** [build_indirect_br addr count b] creates a
+    [indirectbr %addr]
+    instruction at the position specified by the instruction builder [b] with
+    space reserved for [count] destinations.
+    See the method [llvm::LLVMBuilder::CreateIndirectBr]. *)
+external build_indirect_br : llvalue -> int -> llbuilder -> llvalue
+                           = "llvm_build_indirect_br"
+
+(** [add_destination br bb] adds the basic block [bb] as a possible branch
+    location for the indirectbr instruction [br].
+    See the method [llvm::IndirectBrInst::addDestination]. **)
+external add_destination : llvalue -> llbasicblock -> unit
+                         = "llvm_add_destination"
+
 (** [build_invoke fn args tobb unwindbb name b] creates an
     [%name = invoke %fn(args) to %tobb unwind %unwindbb]
     instruction at the position specified by the instruction builder [b].

bindings/ocaml/llvm/llvm_ocaml.c

@@ -1138,6 +1138,20 @@ CAMLprim value llvm_add_case(LLVMValueRef Switch, LLVMValueRef OnVal,
   return Val_unit;
 }
 
+/* llvalue -> llbasicblock -> llbuilder -> llvalue */
+CAMLprim LLVMValueRef llvm_build_indirect_br(LLVMValueRef Addr,
+                                             value EstimatedDests,
+                                             value B) {
+  return LLVMBuildIndirectBr(Builder_val(B), Addr, EstimatedDests);
+}
+
+/* llvalue -> llvalue -> llbasicblock -> unit */
+CAMLprim value llvm_add_destination(LLVMValueRef IndirectBr,
+                                    LLVMBasicBlockRef Dest) {
+  LLVMAddDestination(IndirectBr, Dest);
+  return Val_unit;
+}
+
 /* llvalue -> llvalue array -> llbasicblock -> llbasicblock -> string ->
    llbuilder -> llvalue */
 CAMLprim LLVMValueRef llvm_build_invoke_nat(LLVMValueRef Fn, value Args,

include/llvm-c/Core.h

@@ -655,6 +655,7 @@ LLVMValueRef LLVMConstInsertValue(LLVMValueRef AggConstant,
 LLVMValueRef LLVMConstInlineAsm(LLVMTypeRef Ty,
                                 const char *AsmString, const char *Constraints,
                                 LLVMBool HasSideEffects, LLVMBool IsAlignStack);
+LLVMValueRef LLVMBlockAddress(LLVMValueRef F, LLVMBasicBlockRef BB);
 
 /* Operations on global variables, functions, and aliases (globals) */
 LLVMModuleRef LLVMGetGlobalParent(LLVMValueRef Global);
@@ -805,6 +806,8 @@ LLVMValueRef LLVMBuildCondBr(LLVMBuilderRef, LLVMValueRef If,
                              LLVMBasicBlockRef Then, LLVMBasicBlockRef Else);
 LLVMValueRef LLVMBuildSwitch(LLVMBuilderRef, LLVMValueRef V,
                              LLVMBasicBlockRef Else, unsigned NumCases);
+LLVMValueRef LLVMBuildIndirectBr(LLVMBuilderRef B, LLVMValueRef Addr,
+                                 unsigned NumDests);
 LLVMValueRef LLVMBuildInvoke(LLVMBuilderRef, LLVMValueRef Fn,
                              LLVMValueRef *Args, unsigned NumArgs,
                              LLVMBasicBlockRef Then, LLVMBasicBlockRef Catch,
@@ -816,6 +819,9 @@ LLVMValueRef LLVMBuildUnreachable(LLVMBuilderRef);
 void LLVMAddCase(LLVMValueRef Switch, LLVMValueRef OnVal,
                  LLVMBasicBlockRef Dest);
 
+/* Add a destination to the indirectbr instruction */
+void LLVMAddDestination(LLVMValueRef IndirectBr, LLVMBasicBlockRef Dest);
+
 /* Arithmetic */
 LLVMValueRef LLVMBuildAdd(LLVMBuilderRef, LLVMValueRef LHS, LLVMValueRef RHS,
                           const char *Name);

lib/VMCore/Core.cpp

@@ -1013,6 +1013,10 @@ LLVMValueRef LLVMConstInlineAsm(LLVMTypeRef Ty, const char *AsmString,
                              Constraints, HasSideEffects, IsAlignStack));
 }
 
+LLVMValueRef LLVMBlockAddress(LLVMValueRef F, LLVMBasicBlockRef BB) {
+  return wrap(BlockAddress::get(unwrap<Function>(F), unwrap(BB)));
+}
+
 /*--.. Operations on global variables, functions, and aliases (globals) ....--*/
 
 LLVMModuleRef LLVMGetGlobalParent(LLVMValueRef Global) {
@@ -1696,6 +1700,11 @@ LLVMValueRef LLVMBuildSwitch(LLVMBuilderRef B, LLVMValueRef V,
   return wrap(unwrap(B)->CreateSwitch(unwrap(V), unwrap(Else), NumCases));
 }
 
+LLVMValueRef LLVMBuildIndirectBr(LLVMBuilderRef B, LLVMValueRef Addr,
+                                 unsigned NumDests) {
+  return wrap(unwrap(B)->CreateIndirectBr(unwrap(Addr), NumDests));
+}
+
 LLVMValueRef LLVMBuildInvoke(LLVMBuilderRef B, LLVMValueRef Fn,
                              LLVMValueRef *Args, unsigned NumArgs,
                              LLVMBasicBlockRef Then, LLVMBasicBlockRef Catch,
@@ -1718,6 +1727,10 @@ void LLVMAddCase(LLVMValueRef Switch, LLVMValueRef OnVal,
   unwrap<SwitchInst>(Switch)->addCase(unwrap<ConstantInt>(OnVal), unwrap(Dest));
 }
 
+void LLVMAddDestination(LLVMValueRef IndirectBr, LLVMBasicBlockRef Dest) {
+  unwrap<IndirectBrInst>(IndirectBr)->addDestination(unwrap(Dest));
+}
+
 /*--.. Arithmetic ..........................................................--*/
 
 LLVMValueRef LLVMBuildAdd(LLVMBuilderRef B, LLVMValueRef LHS, LLVMValueRef RHS,

test/Bindings/Ocaml/vmcore.ml

@@ -897,6 +897,23 @@ let test_builder () =
     let si = build_switch p1 bb3 1 (builder_at_end context bb1) in
     ignore (add_case si (const_int i32_type 2) bb2)
   end;
+
+  group "indirectbr"; begin
+    (* RUN: grep {indirectbr i8\\* blockaddress(@X7, %IBRBlock2), \\\[label %IBRBlock2, label %IBRBlock3\\\]} < %t.ll
+     *)
+    let bb1 = append_block context "IBRBlock1" fn in
+
+    let bb2 = append_block context "IBRBlock2" fn in
+    ignore (build_unreachable (builder_at_end context bb2));
+
+    let bb3 = append_block context "IBRBlock3" fn in
+    ignore (build_unreachable (builder_at_end context bb3));
+
+    let addr = block_address fn bb2 in
+    let ibr = build_indirect_br addr 2 (builder_at_end context bb1) in
+    ignore (add_destination ibr bb2);
+    ignore (add_destination ibr bb3)
+  end;
   
   group "invoke"; begin
     (* RUN: grep {build_invoke.*invoke.*P1.*P2} < %t.ll