[LLVMdev] C struct as function argument

[Michael Tindal]

I've been working on a wrapper for LLVM's C++ API to use from Objective-C for a scripting language I'm working on.  I currently have an issue with passing arguments to a function that takes a struct argument.

typedef struct _test_struct {
    int x;
    int y;
} test_struct;

id testLLVMStructFuncCall(test_struct x) {
    NSLog(@"%d %d",x.x,x.y);
    return N(x.x + x.y);
}

-(void) testLLVMStructFuncCall {
    CGKModule* myMod = [CGKModule moduleWithName:@"llvm_structfunccall_test"];
    CGKType* testStructType = [CGKType structTypeWithElementTypes:[NSArray arrayWithObjects:[CGKType intTypeWith32Bits],[CGKType intTypeWith32Bits],nil]];
    CGKFunction* lfunc = [CGKFunction functionWithName:@"testLLVMStructFuncCall" types:[NSArray arrayWithObjects:[CGKType idType],testStructType,nil] intoModule:myMod];
    CGKFunction* rfunc = [CGKBuilder createStandaloneCallForFunction:lfunc withArguments:[NSArray 
                                                                                          arrayWithObjects:
                                                                                          [CGKConstant getStructOfType:testStructType 
                                                                                                            withValues:[NSArray arrayWithObjects:[CGKConstant getIntConstant:N(10) bits:32],
                                                                                                                        [CGKConstant getIntConstant:N(25) bits:32],nil]],nil] 
                                                            inModule:myMod];
    [myMod dump];
    id var = [[CGKRunner runnerForModule:myMod] runCGKFunction:rfunc];
    assertThat(var,is(equalTo(N(35))));
}

Thats the code in question.  The CGK* types are part of my wrapper, and simply wrap the necessary part of the LLVM API.  

Test Case '-[SVFunctionTests testLLVMStructFuncCall]' started.
; ModuleID = 'llvm_structfunccall_test'

%0 = type { i32, i32 }

declare i64* @testLLVMStructFuncCall(%0)

define i64* @0() {
entry:
  %0 = call i64* @testLLVMStructFuncCall(%0 { i32 10, i32 25 })
  ret i64* %0
}
2011-06-20 21:25:54.821 otest-x86_64[3369:707] 10 0
/Users/mtindal/Projects/Silver/Tests/SVFunctionTests.m:576: error: -[SVFunctionTests testLLVMStructFuncCall] : Expected <35>, but was <10>
Test Case '-[SVFunctionTests testLLVMStructFuncCall]' failed (0.016 seconds).

The module dump suggests everything is right, i can see in the function call the struct with the values 10 and 25, but the function is only received the 10 for the x field, nothing for the y field.  Am I missing something?