Skip to content
This repository

HTTPS clone URL

Subversion checkout URL

You can clone with HTTPS or Subversion.

Download ZIP
Fetching contributors…

Octocat-spinner-32-eaf2f5

Cannot retrieve contributors at this time

file 308 lines (266 sloc) 7.507 kb
1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48 49 50 51 52 53 54 55 56 57 58 59 60 61 62 63 64 65 66 67 68 69 70 71 72 73 74 75 76 77 78 79 80 81 82 83 84 85 86 87 88 89 90 91 92 93 94 95 96 97 98 99 100 101 102 103 104 105 106 107 108 109 110 111 112 113 114 115 116 117 118 119 120 121 122 123 124 125 126 127 128 129 130 131 132 133 134 135 136 137 138 139 140 141 142 143 144 145 146 147 148 149 150 151 152 153 154 155 156 157 158 159 160 161 162 163 164 165 166 167 168 169 170 171 172 173 174 175 176 177 178 179 180 181 182 183 184 185 186 187 188 189 190 191 192 193 194 195 196 197 198 199 200 201 202 203 204 205 206 207 208 209 210 211 212 213 214 215 216 217 218 219 220 221 222 223 224 225 226 227 228 229 230 231 232 233 234 235 236 237 238 239 240 241 242 243 244 245 246 247 248 249 250 251 252 253 254 255 256 257 258 259 260 261 262 263 264 265 266 267 268 269 270 271 272 273 274 275 276 277 278 279 280 281 282 283 284 285 286 287 288 289 290 291 292 293 294 295 296 297 298 299 300 301 302 303 304 305 306 307
/*
* MacRuby Interpreter.
*
* This file is covered by the Ruby license. See COPYING for more details.
*
* Copyright (C) 2008-2011, Apple Inc. All rights reserved.
*/

#if !defined(MACRUBY_STATIC)

#include "llvm.h"
#include "macruby_internal.h"
#include "ruby/node.h"
#include "interpreter.h"
#include "vm.h"

#define PRIMITIVE static inline
#include "kernel.c"

// Will be set later, in vm.cpp.
RoxorInterpreter *RoxorInterpreter::shared = NULL;

RoxorInterpreter::RoxorInterpreter(void)
{
    stack = (VALUE *)calloc(INTERPRETER_STACK_SIZE, sizeof(VALUE));
    assert(stack != NULL);
}

RoxorInterpreter::~RoxorInterpreter(void)
{
    free(stack);
}

extern "C" void rb_vm_prepare_method(Class klass, unsigned char dynamic_class,
SEL sel, Function *func, const rb_vm_arity_t arity, int flags);

#define value_as(val, type) ((type)interpret_value(val))

static inline Value *
call_arg(CallInst *insn, unsigned int i)
{
#if LLVM_TOT
    return insn->getOperand(i + 1);
#else
    return insn->getArgOperand(i);
#endif
}

static inline uint64_t
get_const_int(Value *val)
{
    return cast<ConstantInt>(val)->getZExtValue();
}

// A macro to avoid stupid compiler warnings.
#define oops(msg, val) \
printf("interpreter: %s (ID: %d)\n", msg, val->getValueID()); \
val->dump(); \
abort();

VALUE
RoxorInterpreter::interpret_call(CallInst *call)
{
    Function *called = call->getCalledFunction();

    if (called == RoxorCompiler::shared->prepareMethodFunc) {
VALUE klass = value_as(call_arg(call, 0), VALUE);
uint8_t dynamic_class = value_as(call_arg(call, 1), uint8_t);
SEL sel = value_as(call_arg(call, 2), SEL);
Function *func = value_as(call_arg(call, 3), Function *);
uint64_t arity_data = get_const_int(call_arg(call, 4));
rb_vm_arity_t arity;
memcpy(&arity, &arity_data, sizeof(rb_vm_arity_t));
int flags = value_as(call_arg(call, 5), int);

rb_vm_prepare_method((Class)klass, dynamic_class, sel, func, arity,
flags);
return Qnil;
    }
    else if (called == RoxorCompiler::shared->dispatchFunc) {
VALUE top = value_as(call_arg(call, 0), VALUE);
VALUE self = value_as(call_arg(call, 1), VALUE);
void *sel = value_as(call_arg(call, 2), SEL);
void *block = value_as(call_arg(call, 3), void *);
uint8_t opt = value_as(call_arg(call, 4), uint8_t);
int argc = value_as(call_arg(call, 5), int);
VALUE *argv = value_as(call_arg(call, 6), VALUE *);

MDNode *node = call->getMetadata(RoxorCompiler::shared->dbg_mdkind);
if (node != NULL) {
std::string path;
DILocation loc(node);
RoxorCompiler::shared->generate_location_path(path, loc);

Frame frame;
frame.name = (const char *)sel;
frame.path = path;
frame.line = loc.getLineNumber();
frames.push_back(frame);
}

struct Finally {
RoxorInterpreter *ir;
bool pop;
Finally(RoxorInterpreter *_ir, bool _pop) {
ir = _ir;
pop = _pop;
}
~Finally() {
if (pop) {
ir->frames.pop_back();
}
}
} finalizer(this, node != NULL);

return vm_dispatch(top, self, sel, block, opt, argc, argv);
    }
    else if (called == RoxorCompiler::shared->singletonClassFunc) {
VALUE klass = value_as(call_arg(call, 0), VALUE);

return rb_singleton_class(klass);
    }
    else if (called == RoxorCompiler::shared->setCurrentOuterFunc) {
rb_vm_outer_t *outer_stack = value_as(call_arg(call, 0), rb_vm_outer_t *);

rb_vm_set_current_outer(outer_stack);
return Qnil;
    }
    else if (called == RoxorCompiler::shared->getBlockFunc) {
VALUE block = value_as(call_arg(call, 0), VALUE);
return (VALUE)vm_get_block(block);
    }

    oops("unrecognized call instruction:", call);
}

bool
RoxorInterpreter::frame_at_index(unsigned int idx, void *addr,
std::string *name, std::string *path, unsigned int *line)
{
    if ((uintptr_t)addr < (uintptr_t)(void *)&vm_dispatch
|| (uintptr_t)addr > (uintptr_t)(void *)&vm_dispatch + 5000) {
// Likely not an interpreted dispatch call.
return false;
    }
    if (idx >= frames.size()) {
// Not enough frames!
return false;
    }

    Frame &frame = frames[idx];
    *name = frame.name;
    *path = frame.path;
    *line = frame.line;
    return true;
}

#define return_if_cached(__insn) \
std::map<Instruction *, VALUE>::iterator __i = insns.find(__insn); \
if (__i != insns.end()) { \
return __i->second; \
} \

VALUE
RoxorInterpreter::interpret_instruction(Instruction *insn)
{
    switch (insn->getOpcode()) {
case Instruction::Br:
{
BranchInst *br = static_cast<BranchInst *>(insn);
if (br->isUnconditional()) {
BasicBlock *bb = br->getSuccessor(0);
assert(bb != NULL);
return interpret_basicblock(bb);
}
break;
}

case Instruction::Ret:
{
ReturnInst *ret = static_cast<ReturnInst *>(insn);
Value *retval = ret->getReturnValue();
assert(retval != NULL);
return interpret_value(retval);
}

case Instruction::Call:
{
return_if_cached(insn);
VALUE ret = interpret_call(static_cast<CallInst *>(insn));
insns[insn] = ret;
return ret;
}

case Instruction::Alloca:
{
return_if_cached(insn);
// Assuming the allocated type is VALUE.
AllocaInst *allocai = static_cast<AllocaInst *>(insn);
const size_t n = get_const_int(allocai->getArraySize());
assert(n > 0 && stack_p + n < INTERPRETER_STACK_SIZE);
VALUE *mem = &stack[stack_p];
stack_p += n;
insns[insn] = (VALUE)mem;
return (VALUE)mem;
}

case Instruction::Store:
{
StoreInst *store = static_cast<StoreInst *>(insn);
Value *slot = store->getOperand(1);
GetElementPtrInst *ptr = dyn_cast<GetElementPtrInst>(slot);
if (ptr == NULL) {
break;
}
if (ptr->getNumIndices() != 1) {
break;
}
const size_t off = get_const_int(*ptr->idx_begin());
VALUE storage = interpret_instruction(cast<AllocaInst>
(ptr->getPointerOperand()));
VALUE val = interpret_value(store->getOperand(0));
((VALUE *)storage)[off] = val;
return val;
}

// Evaluated later.
case Instruction::GetElementPtr:
return Qnil;
    }

    oops("unrecognized instruction:", insn);
}

VALUE
RoxorInterpreter::interpret_value(Value *val)
{
    unsigned val_id = val->getValueID();
    switch (val_id) {
case Value::ConstantPointerNullVal:
return 0;

case Value::ConstantExprVal:
val = static_cast<ConstantExpr *>(val)->getOperand(0);
// fall through
case Value::ConstantIntVal:
{
ConstantInt *ci = static_cast<ConstantInt *>(val);
const unsigned w = ci->getBitWidth();
#if __LP64__
if (w > 64) {
break;
}
#else
if (w > 32) {
break;
}
#endif
return ci->getZExtValue();
}

case Value::ArgumentVal:
switch (static_cast<Argument *>(val)->getArgNo()) {
case 0:
return self_arg;
case 1:
return (VALUE)sel_arg;
}
break;

default:
if (val_id >= Value::InstructionVal) {
return interpret_instruction(static_cast<Instruction *>(val));
}
break;
    }

    oops("unrecognized value:", val);
}

VALUE
RoxorInterpreter::interpret_basicblock(BasicBlock *bb)
{
    for (BasicBlock::iterator insn = bb->begin(); insn != bb->end(); ++insn) {
Instruction *i = &*insn;
VALUE v = interpret_instruction(i);
if (i->isTerminator()) {
return v;
}
    }

    oops("malformed block:", bb);
}

VALUE
RoxorInterpreter::interpret(Function *func, VALUE self, SEL sel)
{
    self_arg = self;
    sel_arg = sel;
    stack_p = 0;
    insns.clear();

    BasicBlock &b = func->getEntryBlock();
    return interpret_basicblock(&b);
}

#endif // !MACRUBY_STATIC
Something went wrong with that request. Please try again.