llvm dev - Mar 2017 - LLVMGetBitcodeModuleInContext2 problem

I'm trying to use LLVMGetBitcodeModuleInContext2 to load a .bc file.
However, it's not working.

The code looks something like this:

void llvm_load_IR_library(char *path)

{
        LLVMContextRef global_context;
        LLVMMemoryBufferRef module_path;
        LLVMModuleRef ir_lib_module;
        bool flag;

        module_path = LLVMCreateMemoryBufferWithMemoryRange(path,
strlen(path), "path", 1);

        global_context = LLVMGetGlobalContext();

        flag = LLVMGetBitcodeModuleInContext2(global_context, module_path,
&ir_lib_module);

        printf("LLVMGetBitcodeModuleInContet2() returned %d\n", flag);
}

When this code is called, this is printed:

error: Invalid bitcode signature

from what I can tell, the bitcode file is correct:

00000000  42 43 c0 de 35 14 00 00  05 00 00 00 62 0c 30 24
|BC..5.......b.0$|
...

This seems to match this code:

/// Helper to read the header common to all bitcode files.
static bool hasValidBitcodeHeader(BitstreamCursor &Stream) {
  // Sniff for the signature.
  if (Stream.Read(8) != 'B' ||
      Stream.Read(8) != 'C' ||
      Stream.Read(4) != 0x0 ||
      Stream.Read(4) != 0xC ||
      Stream.Read(4) != 0xE ||
      Stream.Read(4) != 0xD)
    return false;
  return true;
}

I'm out of ideas. Anything obvious I'm doing wrong?

Toshi
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On 3/8/2017 3:29 PM, Toshiyasu Morita via llvm-dev
wrote:
>
> I'm trying to use LLVMGetBitcodeModuleInContext2 to load a .bc file.
> However, it's not working.
>
> The code looks something like this:
>
> void llvm_load_IR_library(char *path)
>
> {
>         LLVMContextRef global_context;
>         LLVMMemoryBufferRef module_path;
>         LLVMModuleRef ir_lib_module;
>         bool flag;
>
>         module_path = LLVMCreateMemoryBufferWithMemoryRange(path, 
> strlen(path), "path", 1);
LLVMCreateMemoryBufferWithContentsOfFile takes a path.

-Eli

-- 
Employee of Qualcomm Innovation Center, Inc.
Qualcomm Innovation Center, Inc. is a member of Code Aurora Forum, a Linux
Foundation Collaborative Project

>
>
>         module_path = LLVMCreateMemoryBufferWithMemoryRange(path,
> strlen(path), "path", 1);
>
LLVMCreateMemoryBufferWithContentsOfFile takes a path.

Erm...no...the code is calling LLVMCreateMemoryBufferWithMemoryRange, not
LLVMCreateMemoryBufferWithContentsOfFile...

Or do you mean I need to load the module into memory before calling
LLVMGetBitcodeModuleInContext2?

Toshi


On Wed, Mar 8, 2017 at 3:40 PM, Friedman, Eli <efriedma at codeaurora.org>
wrote:
> On 3/8/2017 3:29 PM, Toshiyasu Morita via llvm-dev wrote:
>
>>
>> I'm trying to use LLVMGetBitcodeModuleInContext2 to load a .bc
file.
>> However, it's not working.
>>
>> The code looks something like this:
>>
>> void llvm_load_IR_library(char *path)
>>
>> {
>>         LLVMContextRef global_context;
>>         LLVMMemoryBufferRef module_path;
>>         LLVMModuleRef ir_lib_module;
>>         bool flag;
>>
>>         module_path = LLVMCreateMemoryBufferWithMemoryRange(path,
>> strlen(path), "path", 1);
>>
>
> LLVMCreateMemoryBufferWithContentsOfFile takes a path.
>
> -Eli
>
> --
> Employee of Qualcomm Innovation Center, Inc.
> Qualcomm Innovation Center, Inc. is a member of Code Aurora Forum, a Linux
> Foundation Collaborative Project
>
>
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