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* Implement access to external variables in LLI

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* Implement GetElementPtr constant expressions when initializing global variables


git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@5880 91177308-0d34-0410-b5e6-96231b3b80d8
This commit is contained in:
Chris Lattner 2003-04-23 19:01:49 +00:00
parent c2b97d43a0
commit d8c03bfa0a
1 changed files with 31 additions and 10 deletions
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41
lib/ExecutionEngine/ExecutionEngine.cpp
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@ -12,6 +12,7 @@
#include "llvm/Module.h"
#include "llvm/Target/TargetData.h"
#include "Support/Statistic.h"
#include <dlfcn.h>
Statistic<> NumInitBytes("lli", "Number of bytes of global vars initialized");
@ -29,10 +30,28 @@ void *ExecutionEngine::getPointerToGlobal(const GlobalValue *GV) {
GenericValue ExecutionEngine::getConstantValue(const Constant *C) {
GenericValue Result;
#define GET_CONST_VAL(TY, CLASS) \
case Type::TY##TyID: Result.TY##Val = cast<CLASS>(C)->getValue(); break
if (ConstantExpr *CE = (ConstantExpr*)dyn_cast<ConstantExpr>(C))
switch (CE->getOpcode()) {
case Instruction::GetElementPtr: {
Result = getConstantValue(cast<Constant>(CE->getOperand(0)));
std::vector<Value*> Indexes(CE->op_begin()+1, CE->op_end());
uint64_t Offset =
TD->getIndexedOffset(CE->getOperand(0)->getType(), Indexes);
Result.LongVal += Offset;
return Result;
}
default:
std::cerr << "ConstantExpr not handled as global var init: " << *CE
<< "\n";
abort();
}
switch (C->getType()->getPrimitiveID()) {
#define GET_CONST_VAL(TY, CLASS) \
case Type::TY##TyID: Result.TY##Val = cast<CLASS>(C)->getValue(); break
GET_CONST_VAL(Bool , ConstantBool);
GET_CONST_VAL(UByte , ConstantUInt);
GET_CONST_VAL(SByte , ConstantSInt);
@ -57,6 +76,7 @@ GenericValue ExecutionEngine::getConstantValue(const Constant *C) {
break;
default:
std::cout << "ERROR: Constant unimp for type: " << C->getType() << "\n";
abort();
}
return Result;
}
@ -213,15 +233,16 @@ void ExecutionEngine::emitGlobals() {
DEBUG(std::cerr << "Global '" << I->getName() << "' -> "
<< (void*)GlobalAddress[I] << "\n");
} else if (I->getName() == "stdout") {
GlobalAddress[I] = &stdout;
} else if (I->getName() == "stderr") {
GlobalAddress[I] = &stderr;
} else if (I->getName() == "stdin") {
GlobalAddress[I] = &stdin;
} else {
std::cerr << "Global: " << I->getName() << "\n";
assert(0 && "References to external globals not handled yet!");
// External variable reference, try to use dlsym to get a pointer to it in
// the LLI image.
if (void *SymAddr = dlsym(0, I->getName().c_str()))
GlobalAddress[I] = SymAddr;
else {
std::cerr << "Could not resolve external global address: "
<< I->getName() << "\n";
abort();
}
}
// Now that all of the globals are set up in memory, loop through them all and