Add break-cfg test coverage for iOS

Our refactor on avoiding shipping a `CompilerInvocation` instance
to favour host clang invocation for jit-compiling code was formerly
testing C++ code only. This additional test should confirm jitting
ASM works properly too when targeting iOS.

src/core/Jitter.cpp

@@ -107,17 +107,13 @@ std::unique_ptr<MemoryBuffer> Jitter::jitAsm(const std::string& Asm, size_t Size
   orc::LLJITBuilder Builder;
   std::string TT = Triple_;
   orc::JITTargetMachineBuilder JTMB{llvm::Triple(TT)};
-  // Note(romain): At this point, the code crashes on OSX/iOS.
-  // -> To be investigated
-#if 0
   JTMB.setRelocationModel(Reloc::Model::PIC_);
   JTMB.setCodeModel(CodeModel::Large);
   JTMB.setCodeGenOptLevel(CodeGenOpt::Level::None);
 
   Builder
     .setPlatformSetUp(orc::setUpInactivePlatform) // /!\Only for iOS???
     .setJITTargetMachineBuilder(JTMB);
-#endif
 
   Builder
     .setJITTargetMachineBuilder(std::move(JTMB));

src/test/passes/break-cfg/basic-aarch64-ios.c

@@ -0,0 +1,56 @@
+// REQUIRES: aarch64-registered-target
+// XFAIL: host-platform-linux
+
+// RUN:                                   clang -target arm64-apple-ios -fno-legacy-pass-manager                         -O1 -fno-verbose-asm -S %s -o - | FileCheck %s
+// RUN: env OMVLL_CONFIG=%S/config_all.py clang -target arm64-apple-ios -fno-legacy-pass-manager -fpass-plugin=%libOMVLL -O1 -fno-verbose-asm -S %s -o - | FileCheck --check-prefix=BREAKCFG-IOS %s
+
+// BREAKCFG-IOS-LABEL: _check_password.1:
+//                     ; adr x1, #0x10
+//                     ; ldr x0, [x1, #61]
+//                     ; ldr x1, #16
+//                     ; blr x1
+// BREAKCFG-IOS:       .byte	129
+// BREAKCFG-IOS:       .byte	0
+// BREAKCFG-IOS:       .byte	0
+// BREAKCFG-IOS:       .byte	16
+// BREAKCFG-IOS:       .byte	32
+// BREAKCFG-IOS:       .byte	208
+// BREAKCFG-IOS:       .byte	67
+// BREAKCFG-IOS:       .byte	248  
+// BREAKCFG-IOS:       .byte	129
+// BREAKCFG-IOS:       .byte	0
+// BREAKCFG-IOS:       .byte	0
+// BREAKCFG-IOS:       .byte	88
+// BREAKCFG-IOS:       .byte	32
+// BREAKCFG-IOS:       .byte	0
+// BREAKCFG-IOS:       .byte	63
+// BREAKCFG-IOS:       .byte	214
+
+// CHECK-LABEL: _check_password:
+// BREAKCFG-IOS:       Lloh0:
+// BREAKCFG-IOS:       adrp	x8, _check_password.1@PAGE
+// BREAKCFG-IOS:       Lloh1:
+// BREAKCFG-IOS:       add	x8, x8, _check_password.1@PAGEOFF
+// BREAKCFG-IOS:       str	x8, [sp]
+// BREAKCFG-IOS:       add	x8, x8, #32
+// BREAKCFG-IOS:       str	x8, [sp, #8]
+// BREAKCFG-IOS:       ldr	x8, [sp, #8]
+// BREAKCFG-IOS:       blr	x8
+
+int check_password(const char* passwd, unsigned len) {
+  if (len != 5) {
+    return 0;
+  }
+  if (passwd[0] == 'O') {
+    if (passwd[1] == 'M') {
+      if (passwd[2] == 'V') {
+        if (passwd[3] == 'L') {
+          if (passwd[4] == 'L') {
+            return 1;
+          }
+        }
+      }
+    }
+  }
+  return 0;
+}

src/test/passes/break-cfg/config_all.py

@@ -0,0 +1,12 @@
+import omvll
+from functools import lru_cache
+
+class MyConfig(omvll.ObfuscationConfig):
+    def __init__(self):
+        super().__init__()
+    def break_control_flow(self, mod: omvll.Module, func: omvll.Function):
+        return True
+
+@lru_cache(maxsize=1)
+def omvll_get_config() -> omvll.ObfuscationConfig:
+    return MyConfig()