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//! Runtime code generation and execution.

use super::prelude::*;
use super::target::LLVMTargetDataRef;
use super::target_machine::{LLVMTargetMachineRef, LLVMCodeModel};

pub enum LLVMOpaqueGenericValue {}
pub enum LLVMOpaqueExecutionEngine {}
pub enum LLVMOpaqueMCJITMemoryManager {}

pub type LLVMGenericValueRef = *mut LLVMOpaqueGenericValue;
pub type LLVMExecutionEngineRef = *mut LLVMOpaqueExecutionEngine;
pub type LLVMMCJITMemoryManagerRef = *mut LLVMOpaqueMCJITMemoryManager;

#[repr(C)]
#[derive(Clone, Copy)]
#[allow(non_snake_case)]
pub struct LLVMMCJITCompilerOptions {
    pub OptLevel: ::libc::c_uint,
    pub CodeModel: LLVMCodeModel,
    pub NoFramePointerElim: LLVMBool,
    pub EnableFastISel: LLVMBool,
    pub MCJMM: LLVMMCJITMemoryManagerRef,
}

pub type LLVMMemoryManagerAllocateCodeSectionCallback =
    extern "C" fn(Opaque: *mut ::libc::c_void,
                  Size: ::libc::uintptr_t,
                  Alignment: ::libc::c_uint,
                  SectionID: ::libc::c_uint,
                  SectionName: *const ::libc::c_char)
                  -> *mut u8;
pub type LLVMMemoryManagerAllocateDataSectionCallback =
    extern "C" fn(Opaque: *mut ::libc::c_void,
                  Size: ::libc::uintptr_t,
                  Alignment: ::libc::c_uint,
                  SectionID: ::libc::c_uint,
                  SectionName: *const ::libc::c_char,
                  IsReadOnly: LLVMBool)
                  -> *mut u8;
pub type LLVMMemoryManagerFinalizeMemoryCallback =
    extern "C" fn(Opaque: *mut ::libc::c_void,
                  ErrMsg: *mut *mut ::libc::c_char)
                  -> LLVMBool;
pub type LLVMMemoryManagerDestroyCallback = Option<extern "C" fn(Opaque: *mut ::libc::c_void)>;

extern "C" {
    pub fn LLVMLinkInMCJIT() -> ();
    pub fn LLVMLinkInInterpreter() -> ();

    // Operations on generic values
    pub fn LLVMCreateGenericValueOfInt(Ty: LLVMTypeRef,
                                       N: ::libc::c_ulonglong,
                                       IsSigned: LLVMBool)
                                       -> LLVMGenericValueRef;
    pub fn LLVMCreateGenericValueOfPointer(P: *mut ::libc::c_void) -> LLVMGenericValueRef;
    pub fn LLVMCreateGenericValueOfFloat(Ty: LLVMTypeRef,
                                         N: ::libc::c_double)
                                         -> LLVMGenericValueRef;
    pub fn LLVMGenericValueIntWidth(GenValRef: LLVMGenericValueRef) -> ::libc::c_uint;
    pub fn LLVMGenericValueToInt(GenVal: LLVMGenericValueRef,
                                 IsSigned: LLVMBool)
                                 -> ::libc::c_ulonglong;
    pub fn LLVMGenericValueToPointer(GenVal: LLVMGenericValueRef) -> *mut ::libc::c_void;
    pub fn LLVMGenericValueToFloat(TyRef: LLVMTypeRef,
                                   GenVal: LLVMGenericValueRef)
                                   -> ::libc::c_double;
    pub fn LLVMDisposeGenericValue(GenVal: LLVMGenericValueRef) -> ();

    // Operations on execution engines
    pub fn LLVMCreateExecutionEngineForModule(OutEE: *mut LLVMExecutionEngineRef,
                                              M: LLVMModuleRef,
                                              OutError: *mut *mut ::libc::c_char)
                                              -> LLVMBool;
    pub fn LLVMCreateInterpreterForModule(OutInterp: *mut LLVMExecutionEngineRef,
                                          M: LLVMModuleRef,
                                          OutError: *mut *mut ::libc::c_char)
                                          -> LLVMBool;
    pub fn LLVMCreateJITCompilerForModule(OutJIT: *mut LLVMExecutionEngineRef,
                                          M: LLVMModuleRef,
                                          OptLevel: ::libc::c_uint,
                                          OutError: *mut *mut ::libc::c_char)
                                          -> LLVMBool;
    pub fn LLVMInitializeMCJITCompilerOptions(Options: *mut LLVMMCJITCompilerOptions,
                                              SizeOfOptions: ::libc::size_t)
                                              -> ();

    /// Create an MCJIT execution engine for a module, with the given options.
    ///
    /// It is
    /// the responsibility of the caller to ensure that all fields in Options up to
    /// the given SizeOfOptions are initialized. It is correct to pass a smaller
    /// value of SizeOfOptions that omits some fields. The canonical way of using
    /// this is:
    ///
    /// ```c++
    /// LLVMMCJITCompilerOptions options;
    /// LLVMInitializeMCJITCompilerOptions(&options, sizeof(options));
    /// // ... fill in those options you care about
    /// LLVMCreateMCJITCompilerForModule(&jit, mod, &options, sizeof(options),
    ///                                  &error);
    /// ```
    ///
    /// Note that this is also correct, though possibly suboptimal:
    ///
    /// ```c++
    /// LLVMCreateMCJITCompilerForModule(&jit, mod, 0, 0, &error);
    /// ```
    ///
    /// 0 is returned on success, or 1 on failure.
    pub fn LLVMCreateMCJITCompilerForModule(OutJIT: *mut LLVMExecutionEngineRef,
                                            M: LLVMModuleRef,
                                            Options: *mut LLVMMCJITCompilerOptions,
                                            SizeOfOptions: ::libc::size_t,
                                            OutError: *mut *mut ::libc::c_char)
                                            -> LLVMBool;

    pub fn LLVMDisposeExecutionEngine(EE: LLVMExecutionEngineRef) -> ();
    pub fn LLVMRunStaticConstructors(EE: LLVMExecutionEngineRef) -> ();
    pub fn LLVMRunStaticDestructors(EE: LLVMExecutionEngineRef) -> ();
    pub fn LLVMRunFunctionAsMain(EE: LLVMExecutionEngineRef,
                                 F: LLVMValueRef,
                                 ArgC: ::libc::c_uint,
                                 ArgV: *const *const ::libc::c_char,
                                 EnvP: *const *const ::libc::c_char)
                                 -> ::libc::c_int;
    pub fn LLVMRunFunction(EE: LLVMExecutionEngineRef,
                           F: LLVMValueRef,
                           NumArgs: ::libc::c_uint,
                           Args: *mut LLVMGenericValueRef)
                           -> LLVMGenericValueRef;
    pub fn LLVMFreeMachineCodeForFunction(EE: LLVMExecutionEngineRef, F: LLVMValueRef) -> ();
    pub fn LLVMAddModule(EE: LLVMExecutionEngineRef, M: LLVMModuleRef) -> ();
    pub fn LLVMRemoveModule(EE: LLVMExecutionEngineRef,
                            M: LLVMModuleRef,
                            OutMod: *mut LLVMModuleRef,
                            OutError: *mut *mut ::libc::c_char)
                            -> LLVMBool;
    pub fn LLVMFindFunction(EE: LLVMExecutionEngineRef,
                            Name: *const ::libc::c_char,
                            OutFn: *mut LLVMValueRef)
                            -> LLVMBool;
    pub fn LLVMRecompileAndRelinkFunction(EE: LLVMExecutionEngineRef,
                                          Fn: LLVMValueRef)
                                          -> *mut ::libc::c_void;
    pub fn LLVMGetExecutionEngineTargetData(EE: LLVMExecutionEngineRef) -> LLVMTargetDataRef;
    pub fn LLVMGetExecutionEngineTargetMachine(EE: LLVMExecutionEngineRef) -> LLVMTargetMachineRef;
    pub fn LLVMAddGlobalMapping(EE: LLVMExecutionEngineRef,
                                Global: LLVMValueRef,
                                Addr: *mut ::libc::c_void)
                                -> ();
    pub fn LLVMGetPointerToGlobal(EE: LLVMExecutionEngineRef,
                                  Global: LLVMValueRef)
                                  -> *mut ::libc::c_void;
    pub fn LLVMGetGlobalValueAddress(EE: LLVMExecutionEngineRef,
                                     Name: *const ::libc::c_char)
                                     -> u64;
    pub fn LLVMGetFunctionAddress(EE: LLVMExecutionEngineRef, Name: *const ::libc::c_char) -> u64;

    // Operations on memory managers
    // Create a simple custom MCJIT memory manager.
    //
    // This memory manager can intercept allocations in a module-oblivious way. It will
    // return NULL if any of the passed functions are NULL.
    //
    // `AllocateCodeSection` and `AllocateDataSection` are called to allocate blocks
    // of memory for executable code and data, respectively. `FinalizeMemory` is called
    // to set page permissions and flush caches, returning 0 on success and 1 on error.
    //
    // `Opaque` will be passed to the callbacks.
    pub fn LLVMCreateSimpleMCJITMemoryManager(Opaque: *mut ::libc::c_void,
                                              AllocateCodeSection: LLVMMemoryManagerAllocateCodeSectionCallback,
                                              AllocateDataSection: LLVMMemoryManagerAllocateDataSectionCallback,
                                              FinalizeMemory: LLVMMemoryManagerFinalizeMemoryCallback,
                                              Destroy: LLVMMemoryManagerDestroyCallback) -> LLVMMCJITMemoryManagerRef;

    pub fn LLVMDisposeMCJITMemoryManager(MM: LLVMMCJITMemoryManagerRef) -> ();
}