[llvm] r346387 - [OCaml] Fix incorrect use of CAMLlocal in nested blocks

[whitequark via llvm-commits]

Author: whitequark
Date: Wed Nov  7 20:00:18 2018
New Revision: 346387

URL: http://llvm.org/viewvc/llvm-project?rev=346387&view=rev
Log:
[OCaml] Fix incorrect use of CAMLlocal in nested blocks

Summary:
The OCaml manual states:

> Local variables of type value must be declared with one of the
> CAMLlocal macros. [...] These macros must be used at the beginning
> of the function, not in a nested block.

This patch moves several instances of CAMLlocal macros from nested
blocks to the function beginning.

Reviewers: whitequark

Reviewed By: whitequark

Subscribers: CodaFi, llvm-commits

Differential Revision: https://reviews.llvm.org/D53841

Modified:
    llvm/trunk/bindings/ocaml/llvm/llvm_ocaml.c

Modified: llvm/trunk/bindings/ocaml/llvm/llvm_ocaml.c
URL: http://llvm.org/viewvc/llvm-project/llvm/trunk/bindings/ocaml/llvm/llvm_ocaml.c?rev=346387&r1=346386&r2=346387&view=diff
==============================================================================
--- llvm/trunk/bindings/ocaml/llvm/llvm_ocaml.c (original)
+++ llvm/trunk/bindings/ocaml/llvm/llvm_ocaml.c Wed Nov  7 20:00:18 2018
@@ -483,9 +483,9 @@ CAMLprim value llvm_struct_set_body(LLVM
 CAMLprim value llvm_struct_name(LLVMTypeRef Ty)
 {
   CAMLparam0();
+  CAMLlocal1(result);
   const char *C = LLVMGetStructName(Ty);
   if (C) {
-    CAMLlocal1(result);
     result = caml_alloc_small(1, 0);
     Store_field(result, 0, caml_copy_string(C));
     CAMLreturn(result);
@@ -636,6 +636,7 @@ enum ValueKind {
 
 CAMLprim value llvm_classify_value(LLVMValueRef Val) {
   CAMLparam0();
+  CAMLlocal1(result);
   if (!Val)
     CAMLreturn(Val_int(NullValue));
   if (LLVMIsAConstant(Val)) {
@@ -652,7 +653,6 @@ CAMLprim value llvm_classify_value(LLVMV
     DEFINE_CASE(Val, ConstantVector);
   }
   if (LLVMIsAInstruction(Val)) {
-    CAMLlocal1(result);
     result = caml_alloc_small(1, 0);
     Store_field(result, 0, Val_int(LLVMGetInstructionOpcode(Val)));
     CAMLreturn(result);
@@ -822,12 +822,11 @@ CAMLprim LLVMValueRef llvm_mdnull(LLVMCo
 /* llvalue -> string option */
 CAMLprim value llvm_get_mdstring(LLVMValueRef V) {
   CAMLparam0();
+  CAMLlocal2(Option, Str);
   const char *S;
   unsigned Len;
 
   if ((S = LLVMGetMDString(V, &Len))) {
-    CAMLlocal2(Option, Str);
-
     Str = caml_alloc_string(Len);
     memcpy(String_val(Str), S, Len);
     Option = alloc(1,0);