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Chris Lattner4d326fa2003-12-20 01:46:27 +00001//===-- JIT.cpp - LLVM Just in Time Compiler ------------------------------===//
Misha Brukmanf976c852005-04-21 22:55:34 +00002//
John Criswellb576c942003-10-20 19:43:21 +00003// The LLVM Compiler Infrastructure
4//
Chris Lattner4ee451d2007-12-29 20:36:04 +00005// This file is distributed under the University of Illinois Open Source
6// License. See LICENSE.TXT for details.
Misha Brukmanf976c852005-04-21 22:55:34 +00007//
John Criswellb576c942003-10-20 19:43:21 +00008//===----------------------------------------------------------------------===//
Chris Lattnerbd199fb2002-12-24 00:01:05 +00009//
Chris Lattner4d326fa2003-12-20 01:46:27 +000010// This tool implements a just-in-time compiler for LLVM, allowing direct
Gabor Greifa99be512007-07-05 17:07:56 +000011// execution of LLVM bitcode in an efficient manner.
Chris Lattnerbd199fb2002-12-24 00:01:05 +000012//
13//===----------------------------------------------------------------------===//
14
Chris Lattner4d326fa2003-12-20 01:46:27 +000015#include "JIT.h"
Chris Lattnercc22e9f2004-08-16 00:14:18 +000016#include "llvm/Constants.h"
Chris Lattnerc07ed132003-12-20 03:36:47 +000017#include "llvm/DerivedTypes.h"
Chris Lattner4d326fa2003-12-20 01:46:27 +000018#include "llvm/Function.h"
Chris Lattnerc07ed132003-12-20 03:36:47 +000019#include "llvm/GlobalVariable.h"
Chris Lattnercc22e9f2004-08-16 00:14:18 +000020#include "llvm/Instructions.h"
Jeffrey Yasskin40966a72010-02-11 01:07:39 +000021#include "llvm/ADT/SmallPtrSet.h"
Bruno Cardoso Lopesa3f99f92009-05-30 20:51:52 +000022#include "llvm/CodeGen/JITCodeEmitter.h"
Argyrios Kyrtzidisb3a847d2009-05-18 21:06:40 +000023#include "llvm/CodeGen/MachineCodeInfo.h"
Jeffrey Yasskindf5a7da2009-06-25 02:04:04 +000024#include "llvm/ExecutionEngine/GenericValue.h"
25#include "llvm/ExecutionEngine/JITEventListener.h"
Owen Anderson07000c62006-05-12 06:33:49 +000026#include "llvm/Target/TargetData.h"
Chris Lattnerbd199fb2002-12-24 00:01:05 +000027#include "llvm/Target/TargetMachine.h"
Chris Lattner4d326fa2003-12-20 01:46:27 +000028#include "llvm/Target/TargetJITInfo.h"
Chris Lattner44e3dd12009-03-03 20:10:23 +000029#include "llvm/Support/Dwarf.h"
Torok Edwin31e24662009-07-07 17:32:34 +000030#include "llvm/Support/ErrorHandling.h"
Jeffrey Yasskin40966a72010-02-11 01:07:39 +000031#include "llvm/Support/ManagedStatic.h"
Chris Lattner44e3dd12009-03-03 20:10:23 +000032#include "llvm/Support/MutexGuard.h"
33#include "llvm/System/DynamicLibrary.h"
Anton Korobeynikov3b30a6e2007-07-30 20:02:02 +000034#include "llvm/Config/config.h"
35
Chris Lattnerc19aade2003-12-08 08:06:28 +000036using namespace llvm;
Misha Brukmanabb027c2003-05-27 21:40:39 +000037
Nate Begemanb76ea742006-07-22 16:59:38 +000038#ifdef __APPLE__
Anton Korobeynikov3b30a6e2007-07-30 20:02:02 +000039// Apple gcc defaults to -fuse-cxa-atexit (i.e. calls __cxa_atexit instead
40// of atexit). It passes the address of linker generated symbol __dso_handle
41// to the function.
42// This configuration change happened at version 5330.
43# include <AvailabilityMacros.h>
44# if defined(MAC_OS_X_VERSION_10_4) && \
45 ((MAC_OS_X_VERSION_MIN_REQUIRED > MAC_OS_X_VERSION_10_4) || \
46 (MAC_OS_X_VERSION_MIN_REQUIRED == MAC_OS_X_VERSION_10_4 && \
47 __APPLE_CC__ >= 5330))
48# ifndef HAVE___DSO_HANDLE
49# define HAVE___DSO_HANDLE 1
50# endif
51# endif
Evan Cheng5f42c552006-07-21 23:06:20 +000052#endif
Anton Korobeynikov3b30a6e2007-07-30 20:02:02 +000053
54#if HAVE___DSO_HANDLE
55extern void *__dso_handle __attribute__ ((__visibility__ ("hidden")));
Nate Begemanb76ea742006-07-22 16:59:38 +000056#endif
Evan Cheng5f42c552006-07-21 23:06:20 +000057
Dan Gohman844731a2008-05-13 00:00:25 +000058namespace {
59
Chris Lattner2fe4bb02006-03-22 06:07:50 +000060static struct RegisterJIT {
61 RegisterJIT() { JIT::Register(); }
62} JITRegistrator;
63
Dan Gohman844731a2008-05-13 00:00:25 +000064}
65
Bob Wilsone46161f2009-06-24 21:09:18 +000066extern "C" void LLVMLinkInJIT() {
Jeff Cohen2f519142006-03-24 02:53:49 +000067}
68
Nicolas Geoffrayd046fc62008-08-28 22:34:49 +000069
Bob Wilsone4373b02010-07-26 21:58:00 +000070#if defined(__GNUC__) && !defined(__ARM_EABI__) && !defined(__USING_SJLJ_EXCEPTIONS__)
Nicolas Geoffrayd046fc62008-08-28 22:34:49 +000071
72// libgcc defines the __register_frame function to dynamically register new
73// dwarf frames for exception handling. This functionality is not portable
74// across compilers and is only provided by GCC. We use the __register_frame
75// function here so that code generated by the JIT cooperates with the unwinding
76// runtime of libgcc. When JITting with exception handling enable, LLVM
77// generates dwarf frames and registers it to libgcc with __register_frame.
78//
79// The __register_frame function works with Linux.
80//
81// Unfortunately, this functionality seems to be in libgcc after the unwinding
82// library of libgcc for darwin was written. The code for darwin overwrites the
83// value updated by __register_frame with a value fetched with "keymgr".
84// "keymgr" is an obsolete functionality, which should be rewritten some day.
85// In the meantime, since "keymgr" is on all libgccs shipped with apple-gcc, we
86// need a workaround in LLVM which uses the "keymgr" to dynamically modify the
87// values of an opaque key, used by libgcc to find dwarf tables.
88
Anton Korobeynikov299d9d72008-03-22 08:53:09 +000089extern "C" void __register_frame(void*);
Nicolas Geoffrayd046fc62008-08-28 22:34:49 +000090
Evan Cheng00f16282009-04-14 22:31:59 +000091#if defined(__APPLE__) && MAC_OS_X_VERSION_MAX_ALLOWED <= 1050
92# define USE_KEYMGR 1
93#else
94# define USE_KEYMGR 0
95#endif
96
97#if USE_KEYMGR
Nicolas Geoffrayd046fc62008-08-28 22:34:49 +000098
99namespace {
100
101// LibgccObject - This is the structure defined in libgcc. There is no #include
102// provided for this structure, so we also define it here. libgcc calls it
103// "struct object". The structure is undocumented in libgcc.
104struct LibgccObject {
105 void *unused1;
106 void *unused2;
107 void *unused3;
108
109 /// frame - Pointer to the exception table.
110 void *frame;
111
112 /// encoding - The encoding of the object?
113 union {
114 struct {
115 unsigned long sorted : 1;
116 unsigned long from_array : 1;
117 unsigned long mixed_encoding : 1;
118 unsigned long encoding : 8;
119 unsigned long count : 21;
120 } b;
121 size_t i;
122 } encoding;
123
124 /// fde_end - libgcc defines this field only if some macro is defined. We
125 /// include this field even if it may not there, to make libgcc happy.
126 char *fde_end;
127
128 /// next - At least we know it's a chained list!
129 struct LibgccObject *next;
130};
131
132// "kemgr" stuff. Apparently, all frame tables are stored there.
133extern "C" void _keymgr_set_and_unlock_processwide_ptr(int, void *);
134extern "C" void *_keymgr_get_and_lock_processwide_ptr(int);
135#define KEYMGR_GCC3_DW2_OBJ_LIST 302 /* Dwarf2 object list */
136
137/// LibgccObjectInfo - libgcc defines this struct as km_object_info. It
138/// probably contains all dwarf tables that are loaded.
139struct LibgccObjectInfo {
140
141 /// seenObjects - LibgccObjects already parsed by the unwinding runtime.
142 ///
143 struct LibgccObject* seenObjects;
144
145 /// unseenObjects - LibgccObjects not parsed yet by the unwinding runtime.
146 ///
147 struct LibgccObject* unseenObjects;
148
149 unsigned unused[2];
150};
151
Nicolas Geoffrayd046fc62008-08-28 22:34:49 +0000152/// darwin_register_frame - Since __register_frame does not work with darwin's
153/// libgcc,we provide our own function, which "tricks" libgcc by modifying the
154/// "Dwarf2 object list" key.
155void DarwinRegisterFrame(void* FrameBegin) {
156 // Get the key.
Chris Lattner44e3dd12009-03-03 20:10:23 +0000157 LibgccObjectInfo* LOI = (struct LibgccObjectInfo*)
Nicolas Geoffrayd046fc62008-08-28 22:34:49 +0000158 _keymgr_get_and_lock_processwide_ptr(KEYMGR_GCC3_DW2_OBJ_LIST);
Chris Lattner44e3dd12009-03-03 20:10:23 +0000159 assert(LOI && "This should be preallocated by the runtime");
Nicolas Geoffrayd046fc62008-08-28 22:34:49 +0000160
161 // Allocate a new LibgccObject to represent this frame. Deallocation of this
162 // object may be impossible: since darwin code in libgcc was written after
163 // the ability to dynamically register frames, things may crash if we
164 // deallocate it.
165 struct LibgccObject* ob = (struct LibgccObject*)
166 malloc(sizeof(struct LibgccObject));
167
168 // Do like libgcc for the values of the field.
169 ob->unused1 = (void *)-1;
170 ob->unused2 = 0;
171 ob->unused3 = 0;
172 ob->frame = FrameBegin;
173 ob->encoding.i = 0;
174 ob->encoding.b.encoding = llvm::dwarf::DW_EH_PE_omit;
175
Dan Gohmanf451cb82010-02-10 16:03:48 +0000176 // Put the info on both places, as libgcc uses the first or the second
Nicolas Geoffrayd046fc62008-08-28 22:34:49 +0000177 // field. Note that we rely on having two pointers here. If fde_end was a
178 // char, things would get complicated.
179 ob->fde_end = (char*)LOI->unseenObjects;
180 ob->next = LOI->unseenObjects;
181
182 // Update the key's unseenObjects list.
183 LOI->unseenObjects = ob;
184
185 // Finally update the "key". Apparently, libgcc requires it.
186 _keymgr_set_and_unlock_processwide_ptr(KEYMGR_GCC3_DW2_OBJ_LIST,
187 LOI);
188
189}
190
191}
192#endif // __APPLE__
193#endif // __GNUC__
Anton Korobeynikov299d9d72008-03-22 08:53:09 +0000194
Chris Lattner34c94332007-12-06 01:34:04 +0000195/// createJIT - This is the factory method for creating a JIT for the current
196/// machine, it does not fall back to the interpreter. This takes ownership
Jeffrey Yasskinf0356fe2010-01-27 20:34:15 +0000197/// of the module.
198ExecutionEngine *ExecutionEngine::createJIT(Module *M,
Chris Lattner34c94332007-12-06 01:34:04 +0000199 std::string *ErrorStr,
Evan Cheng502f20b2008-08-08 08:11:34 +0000200 JITMemoryManager *JMM,
Jeffrey Yasskin489393d2009-07-08 21:59:57 +0000201 CodeGenOpt::Level OptLevel,
Eric Christopher88b5aca2009-11-17 21:58:16 +0000202 bool GVsWithCode,
Jeffrey Yasskin46882612010-02-05 16:19:36 +0000203 CodeModel::Model CMM) {
204 // Use the defaults for extra parameters. Users can use EngineBuilder to
205 // set them.
206 StringRef MArch = "";
207 StringRef MCPU = "";
208 SmallVector<std::string, 1> MAttrs;
209 return JIT::createJIT(M, ErrorStr, JMM, OptLevel, GVsWithCode, CMM,
210 MArch, MCPU, MAttrs);
Reid Kleckner4b1511b2009-07-18 00:42:18 +0000211}
212
Jeffrey Yasskinf0356fe2010-01-27 20:34:15 +0000213ExecutionEngine *JIT::createJIT(Module *M,
Reid Kleckner4b1511b2009-07-18 00:42:18 +0000214 std::string *ErrorStr,
215 JITMemoryManager *JMM,
216 CodeGenOpt::Level OptLevel,
Eric Christopher88b5aca2009-11-17 21:58:16 +0000217 bool GVsWithCode,
Jeffrey Yasskin46882612010-02-05 16:19:36 +0000218 CodeModel::Model CMM,
219 StringRef MArch,
220 StringRef MCPU,
221 const SmallVectorImpl<std::string>& MAttrs) {
Reid Kleckner4b1511b2009-07-18 00:42:18 +0000222 // Pick a target either via -march or by guessing the native arch.
Jeffrey Yasskin46882612010-02-05 16:19:36 +0000223 TargetMachine *TM = JIT::selectTarget(M, MArch, MCPU, MAttrs, ErrorStr);
Reid Kleckner4b1511b2009-07-18 00:42:18 +0000224 if (!TM || (ErrorStr && ErrorStr->length() > 0)) return 0;
Eric Christopher88b5aca2009-11-17 21:58:16 +0000225 TM->setCodeModel(CMM);
Reid Kleckner4b1511b2009-07-18 00:42:18 +0000226
227 // If the target supports JIT code generation, create a the JIT.
228 if (TargetJITInfo *TJ = TM->getJITInfo()) {
Jeffrey Yasskinf0356fe2010-01-27 20:34:15 +0000229 return new JIT(M, *TM, *TJ, JMM, OptLevel, GVsWithCode);
Reid Kleckner4b1511b2009-07-18 00:42:18 +0000230 } else {
231 if (ErrorStr)
232 *ErrorStr = "target does not support JIT code generation";
233 return 0;
234 }
Chris Lattner34c94332007-12-06 01:34:04 +0000235}
236
Jeffrey Yasskin40966a72010-02-11 01:07:39 +0000237namespace {
238/// This class supports the global getPointerToNamedFunction(), which allows
239/// bugpoint or gdb users to search for a function by name without any context.
240class JitPool {
241 SmallPtrSet<JIT*, 1> JITs; // Optimize for process containing just 1 JIT.
242 mutable sys::Mutex Lock;
243public:
244 void Add(JIT *jit) {
245 MutexGuard guard(Lock);
246 JITs.insert(jit);
247 }
248 void Remove(JIT *jit) {
249 MutexGuard guard(Lock);
250 JITs.erase(jit);
251 }
252 void *getPointerToNamedFunction(const char *Name) const {
253 MutexGuard guard(Lock);
254 assert(JITs.size() != 0 && "No Jit registered");
255 //search function in every instance of JIT
256 for (SmallPtrSet<JIT*, 1>::const_iterator Jit = JITs.begin(),
257 end = JITs.end();
258 Jit != end; ++Jit) {
259 if (Function *F = (*Jit)->FindFunctionNamed(Name))
260 return (*Jit)->getPointerToFunction(F);
261 }
262 // The function is not available : fallback on the first created (will
263 // search in symbol of the current program/library)
264 return (*JITs.begin())->getPointerToNamedFunction(Name);
265 }
266};
267ManagedStatic<JitPool> AllJits;
268}
269extern "C" {
270 // getPointerToNamedFunction - This function is used as a global wrapper to
271 // JIT::getPointerToNamedFunction for the purpose of resolving symbols when
272 // bugpoint is debugging the JIT. In that scenario, we are loading an .so and
273 // need to resolve function(s) that are being mis-codegenerated, so we need to
274 // resolve their addresses at runtime, and this is the way to do it.
275 void *getPointerToNamedFunction(const char *Name) {
276 return AllJits->getPointerToNamedFunction(Name);
277 }
278}
279
Jeffrey Yasskinf0356fe2010-01-27 20:34:15 +0000280JIT::JIT(Module *M, TargetMachine &tm, TargetJITInfo &tji,
Jeffrey Yasskin489393d2009-07-08 21:59:57 +0000281 JITMemoryManager *JMM, CodeGenOpt::Level OptLevel, bool GVsWithCode)
Jeffrey Yasskin40966a72010-02-11 01:07:39 +0000282 : ExecutionEngine(M), TM(tm), TJI(tji), AllocateGVsWithCode(GVsWithCode),
283 isAlreadyCodeGenerating(false) {
Chris Lattnerbd199fb2002-12-24 00:01:05 +0000284 setTargetData(TM.getTargetData());
Misha Brukmanabb027c2003-05-27 21:40:39 +0000285
Jeffrey Yasskinf0356fe2010-01-27 20:34:15 +0000286 jitstate = new JITState(M);
Nate Begemanf049e072008-05-21 16:34:48 +0000287
Bruno Cardoso Lopesa3f99f92009-05-30 20:51:52 +0000288 // Initialize JCE
Reid Kleckner27632172009-09-20 23:52:43 +0000289 JCE = createEmitter(*this, JMM, TM);
Misha Brukmanf976c852005-04-21 22:55:34 +0000290
Jeffrey Yasskin40966a72010-02-11 01:07:39 +0000291 // Register in global list of all JITs.
292 AllJits->Add(this);
293
Brian Gaeke50872d52004-04-14 17:45:52 +0000294 // Add target data
Reid Spenceree448632005-07-12 15:51:55 +0000295 MutexGuard locked(lock);
Nate Begemanf049e072008-05-21 16:34:48 +0000296 FunctionPassManager &PM = jitstate->getPM(locked);
Chris Lattnerb93b0342006-05-04 21:18:40 +0000297 PM.add(new TargetData(*TM.getTargetData()));
Brian Gaeke50872d52004-04-14 17:45:52 +0000298
Chris Lattner4d326fa2003-12-20 01:46:27 +0000299 // Turn the machine code intermediate representation into bytes in memory that
300 // may be executed.
Bruno Cardoso Lopesa3f99f92009-05-30 20:51:52 +0000301 if (TM.addPassesToEmitMachineCode(PM, *JCE, OptLevel)) {
Chris Lattner75361b62010-04-07 22:58:41 +0000302 report_fatal_error("Target does not support machine code emission!");
Chris Lattner4d326fa2003-12-20 01:46:27 +0000303 }
Chris Lattner1911fd42006-09-04 04:14:57 +0000304
Nicolas Geoffraya7ec87c2008-08-18 14:53:56 +0000305 // Register routine for informing unwinding runtime about new EH frames
Bob Wilsone4373b02010-07-26 21:58:00 +0000306#if defined(__GNUC__) && !defined(__ARM_EABI__) && !defined(__USING_SJLJ_EXCEPTIONS__)
Evan Cheng00f16282009-04-14 22:31:59 +0000307#if USE_KEYMGR
Nicolas Geoffrayd046fc62008-08-28 22:34:49 +0000308 struct LibgccObjectInfo* LOI = (struct LibgccObjectInfo*)
309 _keymgr_get_and_lock_processwide_ptr(KEYMGR_GCC3_DW2_OBJ_LIST);
310
311 // The key is created on demand, and libgcc creates it the first time an
312 // exception occurs. Since we need the key to register frames, we create
313 // it now.
Chris Lattner3f91bb3ce2009-04-16 21:47:59 +0000314 if (!LOI)
315 LOI = (LibgccObjectInfo*)calloc(sizeof(struct LibgccObjectInfo), 1);
316 _keymgr_set_and_unlock_processwide_ptr(KEYMGR_GCC3_DW2_OBJ_LIST, LOI);
Nicolas Geoffrayd046fc62008-08-28 22:34:49 +0000317 InstallExceptionTableRegister(DarwinRegisterFrame);
318#else
Nicolas Geoffraya7ec87c2008-08-18 14:53:56 +0000319 InstallExceptionTableRegister(__register_frame);
Nicolas Geoffrayd046fc62008-08-28 22:34:49 +0000320#endif // __APPLE__
321#endif // __GNUC__
Nicolas Geoffraya7ec87c2008-08-18 14:53:56 +0000322
Chris Lattner1911fd42006-09-04 04:14:57 +0000323 // Initialize passes.
324 PM.doInitialization();
Chris Lattnerbd199fb2002-12-24 00:01:05 +0000325}
326
Chris Lattner4d326fa2003-12-20 01:46:27 +0000327JIT::~JIT() {
Jeffrey Yasskin40966a72010-02-11 01:07:39 +0000328 AllJits->Remove(this);
Nate Begemanf049e072008-05-21 16:34:48 +0000329 delete jitstate;
Bruno Cardoso Lopesa3f99f92009-05-30 20:51:52 +0000330 delete JCE;
Chris Lattner4d326fa2003-12-20 01:46:27 +0000331 delete &TM;
332}
333
Jeffrey Yasskinf0356fe2010-01-27 20:34:15 +0000334/// addModule - Add a new Module to the JIT. If we previously removed the last
335/// Module, we need re-initialize jitstate with a valid Module.
336void JIT::addModule(Module *M) {
Nate Begemanf049e072008-05-21 16:34:48 +0000337 MutexGuard locked(lock);
338
339 if (Modules.empty()) {
340 assert(!jitstate && "jitstate should be NULL if Modules vector is empty!");
341
Jeffrey Yasskinf0356fe2010-01-27 20:34:15 +0000342 jitstate = new JITState(M);
Nate Begemanf049e072008-05-21 16:34:48 +0000343
344 FunctionPassManager &PM = jitstate->getPM(locked);
345 PM.add(new TargetData(*TM.getTargetData()));
346
347 // Turn the machine code intermediate representation into bytes in memory
348 // that may be executed.
Bruno Cardoso Lopesa3f99f92009-05-30 20:51:52 +0000349 if (TM.addPassesToEmitMachineCode(PM, *JCE, CodeGenOpt::Default)) {
Chris Lattner75361b62010-04-07 22:58:41 +0000350 report_fatal_error("Target does not support machine code emission!");
Nate Begemanf049e072008-05-21 16:34:48 +0000351 }
352
353 // Initialize passes.
354 PM.doInitialization();
355 }
356
Jeffrey Yasskinf0356fe2010-01-27 20:34:15 +0000357 ExecutionEngine::addModule(M);
Nate Begemanf049e072008-05-21 16:34:48 +0000358}
359
Jeffrey Yasskinf0356fe2010-01-27 20:34:15 +0000360/// removeModule - If we are removing the last Module, invalidate the jitstate
361/// since the PassManager it contains references a released Module.
362bool JIT::removeModule(Module *M) {
363 bool result = ExecutionEngine::removeModule(M);
Nate Begemanf049e072008-05-21 16:34:48 +0000364
365 MutexGuard locked(lock);
Nate Begemand6b7a242009-02-18 08:31:02 +0000366
Jeffrey Yasskinf0356fe2010-01-27 20:34:15 +0000367 if (jitstate->getModule() == M) {
Nate Begemanf049e072008-05-21 16:34:48 +0000368 delete jitstate;
369 jitstate = 0;
370 }
371
Nate Begemand6b7a242009-02-18 08:31:02 +0000372 if (!jitstate && !Modules.empty()) {
373 jitstate = new JITState(Modules[0]);
374
375 FunctionPassManager &PM = jitstate->getPM(locked);
376 PM.add(new TargetData(*TM.getTargetData()));
377
378 // Turn the machine code intermediate representation into bytes in memory
379 // that may be executed.
Bruno Cardoso Lopesa3f99f92009-05-30 20:51:52 +0000380 if (TM.addPassesToEmitMachineCode(PM, *JCE, CodeGenOpt::Default)) {
Chris Lattner75361b62010-04-07 22:58:41 +0000381 report_fatal_error("Target does not support machine code emission!");
Nate Begemand6b7a242009-02-18 08:31:02 +0000382 }
383
384 // Initialize passes.
385 PM.doInitialization();
386 }
Nate Begemanf049e072008-05-21 16:34:48 +0000387 return result;
388}
389
Brian Gaeke70975ee2003-09-05 18:42:01 +0000390/// run - Start execution with the specified function and arguments.
Chris Lattner05a1a302003-08-21 21:32:12 +0000391///
Chris Lattnerff0f1bb2003-12-26 06:13:47 +0000392GenericValue JIT::runFunction(Function *F,
393 const std::vector<GenericValue> &ArgValues) {
Chris Lattnerb47130c2004-08-15 23:29:50 +0000394 assert(F && "Function *F was null at entry to run()");
Chris Lattnerb47130c2004-08-15 23:29:50 +0000395
396 void *FPtr = getPointerToFunction(F);
Chris Lattner7c45d782004-08-15 23:31:43 +0000397 assert(FPtr && "Pointer to fn's code was null after getPointerToFunction");
Chris Lattnerf7bedf42004-08-15 23:39:59 +0000398 const FunctionType *FTy = F->getFunctionType();
Chris Lattnere5eab142004-08-15 23:53:06 +0000399 const Type *RetTy = FTy->getReturnType();
Chris Lattnerbd199fb2002-12-24 00:01:05 +0000400
Dan Gohman07ab52b2009-02-19 02:55:18 +0000401 assert((FTy->getNumParams() == ArgValues.size() ||
402 (FTy->isVarArg() && FTy->getNumParams() <= ArgValues.size())) &&
403 "Wrong number of arguments passed into function!");
Chris Lattnere5eab142004-08-15 23:53:06 +0000404 assert(FTy->getNumParams() == ArgValues.size() &&
405 "This doesn't support passing arguments through varargs (yet)!");
406
Misha Brukmanec843022004-10-22 23:35:57 +0000407 // Handle some common cases first. These cases correspond to common `main'
Chris Lattnere5eab142004-08-15 23:53:06 +0000408 // prototypes.
Duncan Sandsb0bc6c32010-02-15 16:12:20 +0000409 if (RetTy->isIntegerTy(32) || RetTy->isVoidTy()) {
Chris Lattnerf7bedf42004-08-15 23:39:59 +0000410 switch (ArgValues.size()) {
411 case 3:
Duncan Sandsb0bc6c32010-02-15 16:12:20 +0000412 if (FTy->getParamType(0)->isIntegerTy(32) &&
Duncan Sands1df98592010-02-16 11:11:14 +0000413 FTy->getParamType(1)->isPointerTy() &&
414 FTy->getParamType(2)->isPointerTy()) {
Chris Lattnerf7bedf42004-08-15 23:39:59 +0000415 int (*PF)(int, char **, const char **) =
Chris Lattner870286a2006-06-01 17:29:22 +0000416 (int(*)(int, char **, const char **))(intptr_t)FPtr;
Misha Brukmanec843022004-10-22 23:35:57 +0000417
Chris Lattnerf7bedf42004-08-15 23:39:59 +0000418 // Call the function.
Chris Lattnere5eab142004-08-15 23:53:06 +0000419 GenericValue rv;
Reid Spencer38f6a152007-03-06 03:11:31 +0000420 rv.IntVal = APInt(32, PF(ArgValues[0].IntVal.getZExtValue(),
421 (char **)GVTOP(ArgValues[1]),
422 (const char **)GVTOP(ArgValues[2])));
Chris Lattnerf7bedf42004-08-15 23:39:59 +0000423 return rv;
424 }
425 break;
Chris Lattner174f2262004-08-16 01:07:04 +0000426 case 2:
Duncan Sandsb0bc6c32010-02-15 16:12:20 +0000427 if (FTy->getParamType(0)->isIntegerTy(32) &&
Duncan Sands1df98592010-02-16 11:11:14 +0000428 FTy->getParamType(1)->isPointerTy()) {
Chris Lattner870286a2006-06-01 17:29:22 +0000429 int (*PF)(int, char **) = (int(*)(int, char **))(intptr_t)FPtr;
Misha Brukmanec843022004-10-22 23:35:57 +0000430
Chris Lattner174f2262004-08-16 01:07:04 +0000431 // Call the function.
432 GenericValue rv;
Reid Spencer38f6a152007-03-06 03:11:31 +0000433 rv.IntVal = APInt(32, PF(ArgValues[0].IntVal.getZExtValue(),
434 (char **)GVTOP(ArgValues[1])));
Chris Lattner174f2262004-08-16 01:07:04 +0000435 return rv;
436 }
437 break;
Chris Lattnerf7bedf42004-08-15 23:39:59 +0000438 case 1:
439 if (FTy->getNumParams() == 1 &&
Duncan Sandsb0bc6c32010-02-15 16:12:20 +0000440 FTy->getParamType(0)->isIntegerTy(32)) {
Chris Lattnere5eab142004-08-15 23:53:06 +0000441 GenericValue rv;
Chris Lattner870286a2006-06-01 17:29:22 +0000442 int (*PF)(int) = (int(*)(int))(intptr_t)FPtr;
Reid Spencer38f6a152007-03-06 03:11:31 +0000443 rv.IntVal = APInt(32, PF(ArgValues[0].IntVal.getZExtValue()));
Chris Lattnerf7bedf42004-08-15 23:39:59 +0000444 return rv;
445 }
446 break;
Chris Lattnere5eab142004-08-15 23:53:06 +0000447 }
448 }
449
450 // Handle cases where no arguments are passed first.
451 if (ArgValues.empty()) {
452 GenericValue rv;
453 switch (RetTy->getTypeID()) {
Torok Edwinc23197a2009-07-14 16:55:14 +0000454 default: llvm_unreachable("Unknown return type for function call!");
Reid Spencera54b7cb2007-01-12 07:05:14 +0000455 case Type::IntegerTyID: {
456 unsigned BitWidth = cast<IntegerType>(RetTy)->getBitWidth();
457 if (BitWidth == 1)
Reid Spencer38f6a152007-03-06 03:11:31 +0000458 rv.IntVal = APInt(BitWidth, ((bool(*)())(intptr_t)FPtr)());
Reid Spencera54b7cb2007-01-12 07:05:14 +0000459 else if (BitWidth <= 8)
Reid Spencer38f6a152007-03-06 03:11:31 +0000460 rv.IntVal = APInt(BitWidth, ((char(*)())(intptr_t)FPtr)());
Reid Spencera54b7cb2007-01-12 07:05:14 +0000461 else if (BitWidth <= 16)
Reid Spencer38f6a152007-03-06 03:11:31 +0000462 rv.IntVal = APInt(BitWidth, ((short(*)())(intptr_t)FPtr)());
Reid Spencera54b7cb2007-01-12 07:05:14 +0000463 else if (BitWidth <= 32)
Reid Spencer38f6a152007-03-06 03:11:31 +0000464 rv.IntVal = APInt(BitWidth, ((int(*)())(intptr_t)FPtr)());
Reid Spencera54b7cb2007-01-12 07:05:14 +0000465 else if (BitWidth <= 64)
Reid Spencer38f6a152007-03-06 03:11:31 +0000466 rv.IntVal = APInt(BitWidth, ((int64_t(*)())(intptr_t)FPtr)());
Reid Spencera54b7cb2007-01-12 07:05:14 +0000467 else
Torok Edwinc23197a2009-07-14 16:55:14 +0000468 llvm_unreachable("Integer types > 64 bits not supported");
Chris Lattnerd297aea2004-08-15 23:34:48 +0000469 return rv;
Reid Spencera54b7cb2007-01-12 07:05:14 +0000470 }
Chris Lattnere5eab142004-08-15 23:53:06 +0000471 case Type::VoidTyID:
Reid Spencer38f6a152007-03-06 03:11:31 +0000472 rv.IntVal = APInt(32, ((int(*)())(intptr_t)FPtr)());
Chris Lattnere5eab142004-08-15 23:53:06 +0000473 return rv;
Chris Lattnere5eab142004-08-15 23:53:06 +0000474 case Type::FloatTyID:
Chris Lattner870286a2006-06-01 17:29:22 +0000475 rv.FloatVal = ((float(*)())(intptr_t)FPtr)();
Chris Lattnere5eab142004-08-15 23:53:06 +0000476 return rv;
477 case Type::DoubleTyID:
Chris Lattner870286a2006-06-01 17:29:22 +0000478 rv.DoubleVal = ((double(*)())(intptr_t)FPtr)();
Chris Lattnere5eab142004-08-15 23:53:06 +0000479 return rv;
Dale Johannesen1abac0d2007-09-17 18:44:13 +0000480 case Type::X86_FP80TyID:
481 case Type::FP128TyID:
482 case Type::PPC_FP128TyID:
Torok Edwinc23197a2009-07-14 16:55:14 +0000483 llvm_unreachable("long double not supported yet");
Dale Johannesen1abac0d2007-09-17 18:44:13 +0000484 return rv;
Chris Lattnere5eab142004-08-15 23:53:06 +0000485 case Type::PointerTyID:
Chris Lattner870286a2006-06-01 17:29:22 +0000486 return PTOGV(((void*(*)())(intptr_t)FPtr)());
Chris Lattnerd297aea2004-08-15 23:34:48 +0000487 }
Chris Lattnerff0f1bb2003-12-26 06:13:47 +0000488 }
Chris Lattnerbd199fb2002-12-24 00:01:05 +0000489
Chris Lattnercc22e9f2004-08-16 00:14:18 +0000490 // Okay, this is not one of our quick and easy cases. Because we don't have a
491 // full FFI, we have to codegen a nullary stub function that just calls the
492 // function we are interested in, passing in constants for all of the
493 // arguments. Make this function and return.
494
495 // First, create the function.
Owen Andersondebcb012009-07-29 22:17:13 +0000496 FunctionType *STy=FunctionType::get(RetTy, false);
Gabor Greif051a9502008-04-06 20:25:17 +0000497 Function *Stub = Function::Create(STy, Function::InternalLinkage, "",
498 F->getParent());
Chris Lattnercc22e9f2004-08-16 00:14:18 +0000499
500 // Insert a basic block.
Owen Anderson1d0be152009-08-13 21:58:54 +0000501 BasicBlock *StubBB = BasicBlock::Create(F->getContext(), "", Stub);
Chris Lattnercc22e9f2004-08-16 00:14:18 +0000502
503 // Convert all of the GenericValue arguments over to constants. Note that we
504 // currently don't support varargs.
Chris Lattner990b8492007-02-13 06:01:22 +0000505 SmallVector<Value*, 8> Args;
Chris Lattnercc22e9f2004-08-16 00:14:18 +0000506 for (unsigned i = 0, e = ArgValues.size(); i != e; ++i) {
507 Constant *C = 0;
508 const Type *ArgTy = FTy->getParamType(i);
509 const GenericValue &AV = ArgValues[i];
510 switch (ArgTy->getTypeID()) {
Torok Edwinc23197a2009-07-14 16:55:14 +0000511 default: llvm_unreachable("Unknown argument type for function call!");
Chris Lattner02a260a2008-04-20 00:41:09 +0000512 case Type::IntegerTyID:
Owen Andersoneed707b2009-07-24 23:12:02 +0000513 C = ConstantInt::get(F->getContext(), AV.IntVal);
Chris Lattner02a260a2008-04-20 00:41:09 +0000514 break;
515 case Type::FloatTyID:
Owen Anderson6f83c9c2009-07-27 20:59:43 +0000516 C = ConstantFP::get(F->getContext(), APFloat(AV.FloatVal));
Chris Lattner02a260a2008-04-20 00:41:09 +0000517 break;
518 case Type::DoubleTyID:
Owen Anderson6f83c9c2009-07-27 20:59:43 +0000519 C = ConstantFP::get(F->getContext(), APFloat(AV.DoubleVal));
Chris Lattner02a260a2008-04-20 00:41:09 +0000520 break;
Dale Johannesen1abac0d2007-09-17 18:44:13 +0000521 case Type::PPC_FP128TyID:
522 case Type::X86_FP80TyID:
Chris Lattner02a260a2008-04-20 00:41:09 +0000523 case Type::FP128TyID:
Owen Anderson6f83c9c2009-07-27 20:59:43 +0000524 C = ConstantFP::get(F->getContext(), APFloat(AV.IntVal));
Chris Lattner02a260a2008-04-20 00:41:09 +0000525 break;
Chris Lattnercc22e9f2004-08-16 00:14:18 +0000526 case Type::PointerTyID:
527 void *ArgPtr = GVTOP(AV);
Chris Lattner02a260a2008-04-20 00:41:09 +0000528 if (sizeof(void*) == 4)
Owen Anderson1d0be152009-08-13 21:58:54 +0000529 C = ConstantInt::get(Type::getInt32Ty(F->getContext()),
530 (int)(intptr_t)ArgPtr);
Chris Lattner02a260a2008-04-20 00:41:09 +0000531 else
Owen Anderson1d0be152009-08-13 21:58:54 +0000532 C = ConstantInt::get(Type::getInt64Ty(F->getContext()),
533 (intptr_t)ArgPtr);
Owen Anderson9adc0ab2009-07-14 23:09:55 +0000534 // Cast the integer to pointer
Owen Andersonbaf3c402009-07-29 18:55:55 +0000535 C = ConstantExpr::getIntToPtr(C, ArgTy);
Chris Lattnercc22e9f2004-08-16 00:14:18 +0000536 break;
537 }
538 Args.push_back(C);
539 }
540
Gabor Greifb1dbcd82008-05-15 10:04:30 +0000541 CallInst *TheCall = CallInst::Create(F, Args.begin(), Args.end(),
542 "", StubBB);
Chris Lattnercdfc51f2008-11-23 08:00:11 +0000543 TheCall->setCallingConv(F->getCallingConv());
Chris Lattnera471e042005-05-06 06:48:54 +0000544 TheCall->setTailCall();
Benjamin Kramerf0127052010-01-05 13:12:22 +0000545 if (!TheCall->getType()->isVoidTy())
Owen Anderson1d0be152009-08-13 21:58:54 +0000546 // Return result of the call.
547 ReturnInst::Create(F->getContext(), TheCall, StubBB);
Chris Lattnercc22e9f2004-08-16 00:14:18 +0000548 else
Owen Anderson1d0be152009-08-13 21:58:54 +0000549 ReturnInst::Create(F->getContext(), StubBB); // Just return void.
Chris Lattnercc22e9f2004-08-16 00:14:18 +0000550
Jeffrey Yasskin3174f672010-02-12 23:05:31 +0000551 // Finally, call our nullary stub function.
552 GenericValue Result = runFunction(Stub, std::vector<GenericValue>());
553 // Erase it, since no other function can have a reference to it.
554 Stub->eraseFromParent();
555 // And return the result.
556 return Result;
Chris Lattnerbd199fb2002-12-24 00:01:05 +0000557}
Chris Lattner4d326fa2003-12-20 01:46:27 +0000558
Jeffrey Yasskindf5a7da2009-06-25 02:04:04 +0000559void JIT::RegisterJITEventListener(JITEventListener *L) {
560 if (L == NULL)
561 return;
562 MutexGuard locked(lock);
563 EventListeners.push_back(L);
564}
565void JIT::UnregisterJITEventListener(JITEventListener *L) {
566 if (L == NULL)
567 return;
568 MutexGuard locked(lock);
569 std::vector<JITEventListener*>::reverse_iterator I=
570 std::find(EventListeners.rbegin(), EventListeners.rend(), L);
571 if (I != EventListeners.rend()) {
572 std::swap(*I, EventListeners.back());
573 EventListeners.pop_back();
574 }
575}
576void JIT::NotifyFunctionEmitted(
577 const Function &F,
578 void *Code, size_t Size,
579 const JITEvent_EmittedFunctionDetails &Details) {
580 MutexGuard locked(lock);
581 for (unsigned I = 0, S = EventListeners.size(); I < S; ++I) {
582 EventListeners[I]->NotifyFunctionEmitted(F, Code, Size, Details);
583 }
584}
585
Jeffrey Yasskin7a9034c2009-10-27 00:03:05 +0000586void JIT::NotifyFreeingMachineCode(void *OldPtr) {
Jeffrey Yasskindf5a7da2009-06-25 02:04:04 +0000587 MutexGuard locked(lock);
588 for (unsigned I = 0, S = EventListeners.size(); I < S; ++I) {
Jeffrey Yasskin7a9034c2009-10-27 00:03:05 +0000589 EventListeners[I]->NotifyFreeingMachineCode(OldPtr);
Jeffrey Yasskindf5a7da2009-06-25 02:04:04 +0000590 }
591}
592
Chris Lattner4d326fa2003-12-20 01:46:27 +0000593/// runJITOnFunction - Run the FunctionPassManager full of
594/// just-in-time compilation passes on F, hopefully filling in
595/// GlobalAddress[F] with the address of F's machine code.
596///
Argyrios Kyrtzidisb3a847d2009-05-18 21:06:40 +0000597void JIT::runJITOnFunction(Function *F, MachineCodeInfo *MCI) {
Reid Spenceree448632005-07-12 15:51:55 +0000598 MutexGuard locked(lock);
Argyrios Kyrtzidisb3a847d2009-05-18 21:06:40 +0000599
Jeffrey Yasskindf5a7da2009-06-25 02:04:04 +0000600 class MCIListener : public JITEventListener {
601 MachineCodeInfo *const MCI;
602 public:
603 MCIListener(MachineCodeInfo *mci) : MCI(mci) {}
604 virtual void NotifyFunctionEmitted(const Function &,
605 void *Code, size_t Size,
606 const EmittedFunctionDetails &) {
607 MCI->setAddress(Code);
608 MCI->setSize(Size);
609 }
610 };
611 MCIListener MCIL(MCI);
Jeffrey Yasskin92fdf452009-12-22 23:18:18 +0000612 if (MCI)
613 RegisterJITEventListener(&MCIL);
Argyrios Kyrtzidisb3a847d2009-05-18 21:06:40 +0000614
Dan Gohman21afcda2009-02-06 21:25:08 +0000615 runJITOnFunctionUnlocked(F, locked);
Argyrios Kyrtzidisb3a847d2009-05-18 21:06:40 +0000616
Jeffrey Yasskin92fdf452009-12-22 23:18:18 +0000617 if (MCI)
618 UnregisterJITEventListener(&MCIL);
Dan Gohman21afcda2009-02-06 21:25:08 +0000619}
620
621void JIT::runJITOnFunctionUnlocked(Function *F, const MutexGuard &locked) {
Chris Lattner17f218e2007-08-13 20:08:16 +0000622 assert(!isAlreadyCodeGenerating && "Error: Recursive compilation detected!");
Chris Lattner4d326fa2003-12-20 01:46:27 +0000623
Chris Lattner68feb222010-07-11 23:07:28 +0000624 jitTheFunction(F, locked);
Chris Lattnerc07ed132003-12-20 03:36:47 +0000625
Nate Begemand6b7a242009-02-18 08:31:02 +0000626 // If the function referred to another function that had not yet been
Jeffrey Yasskindc857242009-10-27 20:30:28 +0000627 // read from bitcode, and we are jitting non-lazily, emit it now.
Nate Begemand6b7a242009-02-18 08:31:02 +0000628 while (!jitstate->getPendingFunctions(locked).empty()) {
629 Function *PF = jitstate->getPendingFunctions(locked).back();
630 jitstate->getPendingFunctions(locked).pop_back();
631
Jeffrey Yasskinaad0d522009-12-17 21:35:29 +0000632 assert(!PF->hasAvailableExternallyLinkage() &&
633 "Externally-defined function should not be in pending list.");
634
Chris Lattner68feb222010-07-11 23:07:28 +0000635 jitTheFunction(PF, locked);
Nate Begemand6b7a242009-02-18 08:31:02 +0000636
637 // Now that the function has been jitted, ask the JITEmitter to rewrite
638 // the stub with real address of the function.
639 updateFunctionStub(PF);
Chris Lattnerc07ed132003-12-20 03:36:47 +0000640 }
Chris Lattner4d326fa2003-12-20 01:46:27 +0000641}
642
Chris Lattner68feb222010-07-11 23:07:28 +0000643void JIT::jitTheFunction(Function *F, const MutexGuard &locked) {
644 isAlreadyCodeGenerating = true;
645 jitstate->getPM(locked).run(*F);
646 isAlreadyCodeGenerating = false;
647
648 // clear basic block addresses after this function is done
649 getBasicBlockAddressMap(locked).clear();
650}
651
Chris Lattner4d326fa2003-12-20 01:46:27 +0000652/// getPointerToFunction - This method is used to get the address of the
653/// specified function, compiling it if neccesary.
654///
655void *JIT::getPointerToFunction(Function *F) {
Reid Spenceree448632005-07-12 15:51:55 +0000656
Chris Lattnerc07ed132003-12-20 03:36:47 +0000657 if (void *Addr = getPointerToGlobalIfAvailable(F))
658 return Addr; // Check if function already code gen'd
Chris Lattner4d326fa2003-12-20 01:46:27 +0000659
Dan Gohmana3ac0c12009-02-19 02:40:15 +0000660 MutexGuard locked(lock);
661
Jeffrey Yasskinaad0d522009-12-17 21:35:29 +0000662 // Now that this thread owns the lock, make sure we read in the function if it
663 // exists in this Module.
664 std::string ErrorMsg;
Jeffrey Yasskinf0356fe2010-01-27 20:34:15 +0000665 if (F->Materialize(&ErrorMsg)) {
Chris Lattner75361b62010-04-07 22:58:41 +0000666 report_fatal_error("Error reading function '" + F->getName()+
Jeffrey Yasskinaad0d522009-12-17 21:35:29 +0000667 "' from bitcode file: " + ErrorMsg);
Nicolas Geoffrayfd7d9912008-04-20 08:33:02 +0000668 }
Chris Lattner4d326fa2003-12-20 01:46:27 +0000669
Jeffrey Yasskinaad0d522009-12-17 21:35:29 +0000670 // ... and check if another thread has already code gen'd the function.
671 if (void *Addr = getPointerToGlobalIfAvailable(F))
672 return Addr;
673
Chris Lattner46264f02009-10-25 23:06:42 +0000674 if (F->isDeclaration() || F->hasAvailableExternallyLinkage()) {
Jeffrey Yasskin6f348e42009-11-09 22:34:19 +0000675 bool AbortOnFailure = !F->hasExternalWeakLinkage();
Dan Gohman69f93782009-01-05 05:32:42 +0000676 void *Addr = getPointerToNamedFunction(F->getName(), AbortOnFailure);
Chris Lattnerc07ed132003-12-20 03:36:47 +0000677 addGlobalMapping(F, Addr);
678 return Addr;
679 }
Chris Lattner4d326fa2003-12-20 01:46:27 +0000680
Dan Gohman21afcda2009-02-06 21:25:08 +0000681 runJITOnFunctionUnlocked(F, locked);
Chris Lattnerc07ed132003-12-20 03:36:47 +0000682
683 void *Addr = getPointerToGlobalIfAvailable(F);
Chris Lattner4d326fa2003-12-20 01:46:27 +0000684 assert(Addr && "Code generation didn't add function to GlobalAddress table!");
685 return Addr;
686}
687
Chris Lattner68feb222010-07-11 23:07:28 +0000688void JIT::addPointerToBasicBlock(const BasicBlock *BB, void *Addr) {
689 MutexGuard locked(lock);
690
691 BasicBlockAddressMapTy::iterator I =
692 getBasicBlockAddressMap(locked).find(BB);
693 if (I == getBasicBlockAddressMap(locked).end()) {
694 getBasicBlockAddressMap(locked)[BB] = Addr;
695 } else {
696 // ignore repeats: some BBs can be split into few MBBs?
697 }
698}
699
700void JIT::clearPointerToBasicBlock(const BasicBlock *BB) {
701 MutexGuard locked(lock);
702 getBasicBlockAddressMap(locked).erase(BB);
703}
704
705void *JIT::getPointerToBasicBlock(BasicBlock *BB) {
706 // make sure it's function is compiled by JIT
707 (void)getPointerToFunction(BB->getParent());
708
709 // resolve basic block address
710 MutexGuard locked(lock);
711
712 BasicBlockAddressMapTy::iterator I =
713 getBasicBlockAddressMap(locked).find(BB);
714 if (I != getBasicBlockAddressMap(locked).end()) {
715 return I->second;
716 } else {
717 assert(0 && "JIT does not have BB address for address-of-label, was"
718 " it eliminated by optimizer?");
719 return 0;
720 }
721}
722
Chris Lattnerc07ed132003-12-20 03:36:47 +0000723/// getOrEmitGlobalVariable - Return the address of the specified global
724/// variable, possibly emitting it to memory if needed. This is used by the
725/// Emitter.
726void *JIT::getOrEmitGlobalVariable(const GlobalVariable *GV) {
Reid Spenceree448632005-07-12 15:51:55 +0000727 MutexGuard locked(lock);
728
Chris Lattnerc07ed132003-12-20 03:36:47 +0000729 void *Ptr = getPointerToGlobalIfAvailable(GV);
730 if (Ptr) return Ptr;
731
732 // If the global is external, just remember the address.
Jeffrey Yasskin898e9df2009-12-13 20:30:32 +0000733 if (GV->isDeclaration() || GV->hasAvailableExternallyLinkage()) {
Anton Korobeynikov3b30a6e2007-07-30 20:02:02 +0000734#if HAVE___DSO_HANDLE
Evan Cheng5f42c552006-07-21 23:06:20 +0000735 if (GV->getName() == "__dso_handle")
736 return (void*)&__dso_handle;
Evan Chengb82ab942006-07-22 00:42:03 +0000737#endif
Daniel Dunbarfbee5792009-07-21 08:54:24 +0000738 Ptr = sys::DynamicLibrary::SearchForAddressOfSymbol(GV->getName());
Jeffrey Yasskin6f348e42009-11-09 22:34:19 +0000739 if (Ptr == 0) {
Chris Lattner75361b62010-04-07 22:58:41 +0000740 report_fatal_error("Could not resolve external global address: "
Torok Edwin31e24662009-07-07 17:32:34 +0000741 +GV->getName());
Chris Lattnerc07ed132003-12-20 03:36:47 +0000742 }
Nate Begeman66941982009-03-04 19:10:38 +0000743 addGlobalMapping(GV, Ptr);
Chris Lattnerc07ed132003-12-20 03:36:47 +0000744 } else {
Dale Johannesendd947ea2008-08-07 01:30:15 +0000745 // If the global hasn't been emitted to memory yet, allocate space and
Jeffrey Yasskin489393d2009-07-08 21:59:57 +0000746 // emit it into memory.
747 Ptr = getMemoryForGV(GV);
Dale Johannesendd947ea2008-08-07 01:30:15 +0000748 addGlobalMapping(GV, Ptr);
Jeffrey Yasskin489393d2009-07-08 21:59:57 +0000749 EmitGlobalVariable(GV); // Initialize the variable.
Chris Lattnerc07ed132003-12-20 03:36:47 +0000750 }
Chris Lattnerc07ed132003-12-20 03:36:47 +0000751 return Ptr;
752}
753
Chris Lattner4d326fa2003-12-20 01:46:27 +0000754/// recompileAndRelinkFunction - This method is used to force a function
755/// which has already been compiled, to be compiled again, possibly
756/// after it has been modified. Then the entry to the old copy is overwritten
757/// with a branch to the new copy. If there was no old copy, this acts
758/// just like JIT::getPointerToFunction().
759///
760void *JIT::recompileAndRelinkFunction(Function *F) {
Chris Lattnerc07ed132003-12-20 03:36:47 +0000761 void *OldAddr = getPointerToGlobalIfAvailable(F);
Chris Lattner4d326fa2003-12-20 01:46:27 +0000762
Chris Lattnerc07ed132003-12-20 03:36:47 +0000763 // If it's not already compiled there is no reason to patch it up.
764 if (OldAddr == 0) { return getPointerToFunction(F); }
Chris Lattner4d326fa2003-12-20 01:46:27 +0000765
Chris Lattnerc07ed132003-12-20 03:36:47 +0000766 // Delete the old function mapping.
767 addGlobalMapping(F, 0);
768
Chris Lattnerc07ed132003-12-20 03:36:47 +0000769 // Recodegen the function
Chris Lattner4d326fa2003-12-20 01:46:27 +0000770 runJITOnFunction(F);
Chris Lattnerc07ed132003-12-20 03:36:47 +0000771
772 // Update state, forward the old function to the new function.
773 void *Addr = getPointerToGlobalIfAvailable(F);
Chris Lattner4d326fa2003-12-20 01:46:27 +0000774 assert(Addr && "Code generation didn't add function to GlobalAddress table!");
775 TJI.replaceMachineCodeForFunction(OldAddr, Addr);
776 return Addr;
777}
Misha Brukman895eddf2004-11-07 23:58:46 +0000778
Nicolas Geoffray46fa1392008-10-25 15:41:43 +0000779/// getMemoryForGV - This method abstracts memory allocation of global
780/// variable so that the JIT can allocate thread local variables depending
781/// on the target.
782///
783char* JIT::getMemoryForGV(const GlobalVariable* GV) {
Jeffrey Yasskin489393d2009-07-08 21:59:57 +0000784 char *Ptr;
785
786 // GlobalVariable's which are not "constant" will cause trouble in a server
787 // situation. It's returned in the same block of memory as code which may
788 // not be writable.
789 if (isGVCompilationDisabled() && !GV->isConstant()) {
Chris Lattner75361b62010-04-07 22:58:41 +0000790 report_fatal_error("Compilation of non-internal GlobalValue is disabled!");
Jeffrey Yasskin489393d2009-07-08 21:59:57 +0000791 }
792
793 // Some applications require globals and code to live together, so they may
794 // be allocated into the same buffer, but in general globals are allocated
795 // through the memory manager which puts them near the code but not in the
796 // same buffer.
797 const Type *GlobalType = GV->getType()->getElementType();
798 size_t S = getTargetData()->getTypeAllocSize(GlobalType);
799 size_t A = getTargetData()->getPreferredAlignment(GV);
Nicolas Geoffray46fa1392008-10-25 15:41:43 +0000800 if (GV->isThreadLocal()) {
801 MutexGuard locked(lock);
Jeffrey Yasskin489393d2009-07-08 21:59:57 +0000802 Ptr = TJI.allocateThreadLocalMemory(S);
803 } else if (TJI.allocateSeparateGVMemory()) {
804 if (A <= 8) {
805 Ptr = (char*)malloc(S);
806 } else {
807 // Allocate S+A bytes of memory, then use an aligned pointer within that
808 // space.
809 Ptr = (char*)malloc(S+A);
810 unsigned MisAligned = ((intptr_t)Ptr & (A-1));
811 Ptr = Ptr + (MisAligned ? (A-MisAligned) : 0);
812 }
813 } else if (AllocateGVsWithCode) {
814 Ptr = (char*)JCE->allocateSpace(S, A);
Nicolas Geoffray46fa1392008-10-25 15:41:43 +0000815 } else {
Jeffrey Yasskin489393d2009-07-08 21:59:57 +0000816 Ptr = (char*)JCE->allocateGlobal(S, A);
Nicolas Geoffray46fa1392008-10-25 15:41:43 +0000817 }
Jeffrey Yasskin489393d2009-07-08 21:59:57 +0000818 return Ptr;
Nicolas Geoffray46fa1392008-10-25 15:41:43 +0000819}
Nate Begemand6b7a242009-02-18 08:31:02 +0000820
821void JIT::addPendingFunction(Function *F) {
822 MutexGuard locked(lock);
823 jitstate->getPendingFunctions(locked).push_back(F);
824}
Jeffrey Yasskindf5a7da2009-06-25 02:04:04 +0000825
826
827JITEventListener::~JITEventListener() {}