[英]How can I call this native function from F#? (LLVMCreateJITCompilerForModule)
我正在使用llvm-fs綁定,我想調用的一個方法是createJITCompilerForModule
,它是LLVM C api中本機方法LLVMCreateJITCompilerForModule
的外部。 llvm-fs的作者聲稱他不能在F#中創建這個函數調用的“漂亮”版本:
createJITCompilerForModule in llvm-fs:Generated.fs
:
[<DllImport(
"LLVM-3.1.dll",
EntryPoint="LLVMCreateJITCompilerForModule",
CallingConvention=CallingConvention.Cdecl,
CharSet=CharSet.Ansi)>]
extern bool createJITCompilerForModuleNative(
void* (* LLVMExecutionEngineRef* *) OutJIT,
void* (* LLVMModuleRef *) M,
uint32 OptLevel,
void* OutError)
// I don't know how to generate an "F# friendly" version of LLVMCreateJITCompilerForModule
你知道我如何從F#中調用這個函數,甚至是本機的函數嗎? 看起來它有一個OutJIT
的'out參數'(因為本機代碼重新指定了void*
指向的東西)。 這是本機功能:
LLVMCreateJITCompilerForModule in llvm-c:ExecutionEngineBindings.cpp
:
LLVMBool LLVMCreateJITCompilerForModule(LLVMExecutionEngineRef *OutJIT,
LLVMModuleRef M,
unsigned OptLevel,
char **OutError) {
std::string Error;
EngineBuilder builder(unwrap(M));
builder.setEngineKind(EngineKind::JIT)
.setErrorStr(&Error)
.setOptLevel((CodeGenOpt::Level)OptLevel);
if (ExecutionEngine *JIT = builder.create()) {
*OutJIT = wrap(JIT);
return 0;
}
*OutError = strdup(Error.c_str());
return 1;
}
我想要使用的實際功能是一個特殊的手工制作,因為它無法生成。 我把這里作為如何調用它的例子:
let private createEngineForModuleFromNativeFunc
(nativeFunc : (nativeint * nativeint * nativeint) -> bool)
(moduleRef : ModuleRef) =
use outEnginePtr = new NativePtrs([|0n|])
use outErrPtr = new NativePtrs([|0n|])
let createFailed =
nativeFunc (
outEnginePtr.Ptrs,
moduleRef.Ptr,
outErrPtr.Ptrs)
if createFailed then
let errStr = Marshal.PtrToStringAuto (Marshal.ReadIntPtr outErrPtr.Ptrs)
Marshal.FreeHGlobal (Marshal.ReadIntPtr outErrPtr.Ptrs)
failwith errStr
else
ExecutionEngineRef (Marshal.ReadIntPtr outEnginePtr.Ptrs)
let createJITCompilerForModule (modRef : ModuleRef) (optLvl : uint32) =
let f (engPtr, modPtr, outErrPtr) =
createJITCompilerForModuleNative (engPtr, modPtr, optLvl, outErrPtr)
createEngineForModuleFromNativeFunc f modRef
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