//===- Target/TargetJITInfo.h - Target Information for JIT ------*- C++ -*-===//
-//
+//
// The LLVM Compiler Infrastructure
//
-// This file was developed by the LLVM research group and is distributed under
-// the University of Illinois Open Source License. See LICENSE.TXT for details.
-//
+// This file is distributed under the University of Illinois Open Source
+// License. See LICENSE.TXT for details.
+//
//===----------------------------------------------------------------------===//
//
// This file exposes an abstract interface used by the Just-In-Time code
#ifndef LLVM_TARGET_TARGETJITINFO_H
#define LLVM_TARGET_TARGETJITINFO_H
+#include "llvm/Support/DataTypes.h"
+#include "llvm/Support/ErrorHandling.h"
#include <cassert>
namespace llvm {
class Function;
- class FunctionPassManager;
- class MachineCodeEmitter;
+ class GlobalValue;
+ class JITCodeEmitter;
class MachineRelocation;
/// TargetJITInfo - Target specific information required by the Just-In-Time
/// code generator.
class TargetJITInfo {
+ virtual void anchor();
public:
virtual ~TargetJITInfo() {}
-
- /// addPassesToJITCompile - Add passes to the specified pass manager to
- /// implement a fast code generator for this target.
- ///
- virtual void addPassesToJITCompile(FunctionPassManager &PM) = 0;
-
+
/// replaceMachineCodeForFunction - Make it so that calling the function
/// whose machine code is at OLD turns into a call to NEW, perhaps by
/// overwriting OLD with a branch to NEW. This is used for self-modifying
/// code.
///
- virtual void replaceMachineCodeForFunction (void *Old, void *New) = 0;
-
- /// getJITStubForFunction - Create or return a stub for the specified
- /// function. This stub acts just like the specified function, except that
- /// it allows the "address" of the function to be taken without having to
- /// generate code for it. Targets do not need to implement this method, but
- /// doing so will allow for faster startup of the JIT.
- ///
- virtual void *getJITStubForFunction(Function *F, MachineCodeEmitter &MCE) {
- return 0;
+ virtual void replaceMachineCodeForFunction(void *Old, void *New) = 0;
+
+ /// emitGlobalValueIndirectSym - Use the specified JITCodeEmitter object
+ /// to emit an indirect symbol which contains the address of the specified
+ /// ptr.
+ virtual void *emitGlobalValueIndirectSym(const GlobalValue* GV, void *ptr,
+ JITCodeEmitter &JCE) {
+ llvm_unreachable("This target doesn't implement "
+ "emitGlobalValueIndirectSym!");
+ }
+
+ /// Records the required size and alignment for a call stub in bytes.
+ struct StubLayout {
+ size_t Size;
+ size_t Alignment;
+ };
+ /// Returns the maximum size and alignment for a call stub on this target.
+ virtual StubLayout getStubLayout() {
+ llvm_unreachable("This target doesn't implement getStubLayout!");
+ }
+
+ /// emitFunctionStub - Use the specified JITCodeEmitter object to emit a
+ /// small native function that simply calls the function at the specified
+ /// address. The JITCodeEmitter must already have storage allocated for the
+ /// stub. Return the address of the resultant function, which may have been
+ /// aligned from the address the JCE was set up to emit at.
+ virtual void *emitFunctionStub(const Function* F, void *Target,
+ JITCodeEmitter &JCE) {
+ llvm_unreachable("This target doesn't implement emitFunctionStub!");
+ }
+
+ /// getPICJumpTableEntry - Returns the value of the jumptable entry for the
+ /// specific basic block.
+ virtual uintptr_t getPICJumpTableEntry(uintptr_t BB, uintptr_t JTBase) {
+ llvm_unreachable("This target doesn't implement getPICJumpTableEntry!");
+ }
+
+ /// LazyResolverFn - This typedef is used to represent the function that
+ /// unresolved call points should invoke. This is a target specific
+ /// function that knows how to walk the stack and find out which stub the
+ /// call is coming from.
+ typedef void (*LazyResolverFn)();
+
+ /// JITCompilerFn - This typedef is used to represent the JIT function that
+ /// lazily compiles the function corresponding to a stub. The JIT keeps
+ /// track of the mapping between stubs and LLVM Functions, the target
+ /// provides the ability to figure out the address of a stub that is called
+ /// by the LazyResolverFn.
+ typedef void* (*JITCompilerFn)(void *);
+
+ /// getLazyResolverFunction - This method is used to initialize the JIT,
+ /// giving the target the function that should be used to compile a
+ /// function, and giving the JIT the target function used to do the lazy
+ /// resolving.
+ virtual LazyResolverFn getLazyResolverFunction(JITCompilerFn) {
+ llvm_unreachable("Not implemented for this target!");
}
/// relocate - Before the JIT can run a block of code that has been emitted,
/// it must rewrite the code to contain the actual addresses of any
/// referenced global symbols.
virtual void relocate(void *Function, MachineRelocation *MR,
- unsigned NumRelocs) {
+ unsigned NumRelocs, unsigned char* GOTBase) {
assert(NumRelocs == 0 && "This target does not have relocations!");
}
+
+ /// allocateThreadLocalMemory - Each target has its own way of
+ /// handling thread local variables. This method returns a value only
+ /// meaningful to the target.
+ virtual char* allocateThreadLocalMemory(size_t size) {
+ llvm_unreachable("This target does not implement thread local storage!");
+ }
+
+ /// needsGOT - Allows a target to specify that it would like the
+ /// JIT to manage a GOT for it.
+ bool needsGOT() const { return useGOT; }
+
+ /// hasCustomConstantPool - Allows a target to specify that constant
+ /// pool address resolution is handled by the target.
+ virtual bool hasCustomConstantPool() const { return false; }
+
+ /// hasCustomJumpTables - Allows a target to specify that jumptables
+ /// are emitted by the target.
+ virtual bool hasCustomJumpTables() const { return false; }
+
+ /// allocateSeparateGVMemory - If true, globals should be placed in
+ /// separately allocated heap memory rather than in the same
+ /// code memory allocated by JITCodeEmitter.
+ virtual bool allocateSeparateGVMemory() const { return false; }
+ protected:
+ bool useGOT;
};
} // End llvm namespace
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