[llvm-c] Add non-cstring versions of LLVMGetNamedFunction and LLVMGetNamedGlobal (llvm#103396)

Add `LLVMGetNamedFunctionWithLength` and `LLVMGetNamedGlobalWithLength`

As far as i know, it isn't currently possible to use
`LLVMGetNamedFunction` and `LLVMGetNamedGlobal` with non-null-terminated
strings.

These new functions are more convenient for C programs that use
non-null-terminated strings or for languages like Rust that primarily
use non-null-terminated strings.

Author: wr7

llvm/docs/ReleaseNotes.rst

@@ -151,6 +151,11 @@ Changes to the C API
   * ``LLVMX86MMXTypeInContext``
   * ``LLVMX86MMXType``
 
+ * The following functions are added to further support non-null-terminated strings:
+
+  * ``LLVMGetNamedFunctionWithLength``
+  * ``LLVMGetNamedGlobalWithLength``
+
 Changes to the CodeGen infrastructure
 -------------------------------------
 

llvm/include/llvm-c/Core.h

@@ -1179,6 +1179,16 @@ LLVMValueRef LLVMAddFunction(LLVMModuleRef M, const char *Name,
  */
 LLVMValueRef LLVMGetNamedFunction(LLVMModuleRef M, const char *Name);
 
+/**
+ * Obtain a Function value from a Module by its name.
+ *
+ * The returned value corresponds to a llvm::Function value.
+ *
+ * @see llvm::Module::getFunction()
+ */
+LLVMValueRef LLVMGetNamedFunctionWithLength(LLVMModuleRef M, const char *Name,
+                                            size_t Length);
+
 /**
  * Obtain an iterator to the first Function in a Module.
  *
@@ -2633,6 +2643,8 @@ LLVMValueRef LLVMAddGlobalInAddressSpace(LLVMModuleRef M, LLVMTypeRef Ty,
                                          const char *Name,
                                          unsigned AddressSpace);
 LLVMValueRef LLVMGetNamedGlobal(LLVMModuleRef M, const char *Name);
+LLVMValueRef LLVMGetNamedGlobalWithLength(LLVMModuleRef M, const char *Name,
+                                          size_t Length);
 LLVMValueRef LLVMGetFirstGlobal(LLVMModuleRef M);
 LLVMValueRef LLVMGetLastGlobal(LLVMModuleRef M);
 LLVMValueRef LLVMGetNextGlobal(LLVMValueRef GlobalVar);

llvm/lib/IR/Core.cpp

@@ -2203,6 +2203,11 @@ LLVMValueRef LLVMGetNamedGlobal(LLVMModuleRef M, const char *Name) {
   return wrap(unwrap(M)->getNamedGlobal(Name));
 }
 
+LLVMValueRef LLVMGetNamedGlobalWithLength(LLVMModuleRef M, const char *Name,
+                                          size_t Length) {
+  return wrap(unwrap(M)->getNamedGlobal(StringRef(Name, Length)));
+}
+
 LLVMValueRef LLVMGetFirstGlobal(LLVMModuleRef M) {
   Module *Mod = unwrap(M);
   Module::global_iterator I = Mod->global_begin();
@@ -2381,6 +2386,11 @@ LLVMValueRef LLVMGetNamedFunction(LLVMModuleRef M, const char *Name) {
   return wrap(unwrap(M)->getFunction(Name));
 }
 
+LLVMValueRef LLVMGetNamedFunctionWithLength(LLVMModuleRef M, const char *Name,
+                                            size_t Length) {
+  return wrap(unwrap(M)->getFunction(StringRef(Name, Length)));
+}
+
 LLVMValueRef LLVMGetFirstFunction(LLVMModuleRef M) {
   Module *Mod = unwrap(M);
   Module::iterator I = Mod->begin();