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This commit is contained in:
Nathan Binkert 2009-02-10 22:19:27 -08:00
parent cf4a00ca41
commit f255957b90
2 changed files with 63 additions and 47 deletions
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41
src/cpu/static_inst.cc
View file

@ -40,11 +40,17 @@ StaticInst::DecodeCache StaticInst::decodeCache;
StaticInst::AddrDecodeCache StaticInst::addrDecodeCache;
StaticInst::cacheElement StaticInst::recentDecodes[2];
using namespace std;
StaticInst::~StaticInst()
{
if (cachedDisassembly)
delete cachedDisassembly;
}
void
StaticInst::dumpDecodeCacheStats()
{
using namespace std;
cerr << "Decode hash table stats @ " << curTick << ":" << endl;
cerr << "\tnum entries = " << decodeCache.size() << endl;
cerr << "\tnum buckets = " << decodeCache.bucket_count() << endl;
@ -84,3 +90,34 @@ StaticInst::fetchMicroop(MicroPC micropc)
"that is not microcoded.");
}
Addr
StaticInst::branchTarget(Addr branchPC) const
{
panic("StaticInst::branchTarget() called on instruction "
"that is not a PC-relative branch.");
M5_DUMMY_RETURN;
}
Addr
StaticInst::branchTarget(ThreadContext *tc) const
{
panic("StaticInst::branchTarget() called on instruction "
"that is not an indirect branch.");
M5_DUMMY_RETURN;
}
Request::Flags
StaticInst::memAccFlags()
{
panic("StaticInst::memAccFlags called on non-memory instruction");
return 0;
}
const string &
StaticInst::disassemble(Addr pc, const SymbolTable *symtab) const
{
if (!cachedDisassembly)
cachedDisassembly = new string(generateDisassembly(pc, symtab));
return *cachedDisassembly;
}

67
src/cpu/static_inst.hh
View file

@ -382,12 +382,7 @@ class StaticInst : public StaticInstBase
{ }
public:
virtual ~StaticInst()
{
if (cachedDisassembly)
delete cachedDisassembly;
}
virtual ~StaticInst();
/**
* The execute() signatures are auto-generated by scons based on the
@ -406,12 +401,7 @@ class StaticInst : public StaticInstBase
* Invalid if not a PC-relative branch (i.e. isDirectCtrl()
* should be true).
*/
virtual Addr branchTarget(Addr branchPC) const
{
panic("StaticInst::branchTarget() called on instruction "
"that is not a PC-relative branch.");
M5_DUMMY_RETURN
}
virtual Addr branchTarget(Addr branchPC) const;
/**
* Return the target address for an indirect branch (jump). The
@ -420,12 +410,7 @@ class StaticInst : public StaticInstBase
* execute the branch in question. Invalid if not an indirect
* branch (i.e. isIndirectCtrl() should be true).
*/
virtual Addr branchTarget(ThreadContext *tc) const
{
panic("StaticInst::branchTarget() called on instruction "
"that is not an indirect branch.");
M5_DUMMY_RETURN
}
virtual Addr branchTarget(ThreadContext *tc) const;
/**
* Return true if the instruction is a control transfer, and if so,
@ -433,11 +418,7 @@ class StaticInst : public StaticInstBase
*/
bool hasBranchTarget(Addr pc, ThreadContext *tc, Addr &tgt) const;
virtual Request::Flags memAccFlags()
{
panic("StaticInst::memAccFlags called on non-memory instruction");
return 0;
};
virtual Request::Flags memAccFlags();
/**
* Return string representation of disassembled instruction.
@ -447,14 +428,7 @@ class StaticInst : public StaticInstBase
* should not be cached, this function should be overridden directly.
*/
virtual const std::string &disassemble(Addr pc,
const SymbolTable *symtab = 0) const
{
if (!cachedDisassembly)
cachedDisassembly =
new std::string(generateDisassembly(pc, symtab));
return *cachedDisassembly;
}
const SymbolTable *symtab = 0) const;
/// Decoded instruction cache type.
/// For now we're using a generic hash_map; this seems to work
@ -486,13 +460,13 @@ class StaticInst : public StaticInstBase
/// A cache of decoded instruction objects from addresses.
static AddrDecodeCache addrDecodeCache;
struct cacheElement {
struct cacheElement
{
Addr page_addr;
AddrDecodePage *decodePage;
cacheElement()
:decodePage(NULL) { }
} ;
cacheElement() : decodePage(NULL) { }
};
/// An array of recently decoded instructions.
// might not use an array if there is only two elements
@ -521,7 +495,7 @@ class StaticInst : public StaticInstBase
/// @retval A pointer to the corresponding StaticInst object.
//This is defined as inlined below.
static StaticInstPtr searchCache(ExtMachInst mach_inst, Addr addr,
AddrDecodePage * decodePage);
AddrDecodePage *decodePage);
};
typedef RefCountingPtr<StaticInstBase> StaticInstBasePtr;
@ -575,7 +549,8 @@ class AddrDecodePage
public:
/// Constructor
AddrDecodePage() {
AddrDecodePage()
{
lowerMask = TheISA::PageBytes - 1;
memset(valid, 0, TheISA::PageBytes);
}
@ -585,7 +560,8 @@ class AddrDecodePage
/// related to the address
/// @param mach_inst The binary instruction to check
/// @param addr The address containing the instruction
inline bool decoded(ExtMachInst mach_inst, Addr addr)
bool
decoded(ExtMachInst mach_inst, Addr addr)
{
return (valid[addr & lowerMask] &&
(instructions[addr & lowerMask]->machInst == mach_inst));
@ -595,19 +571,22 @@ class AddrDecodePage
/// to check if the instruction is valid.
/// @param addr The address of the instruction.
/// @retval A pointer to the corresponding StaticInst object.
inline StaticInstPtr getInst(Addr addr)
{ return instructions[addr & lowerMask]; }
StaticInstPtr
getInst(Addr addr)
{
return instructions[addr & lowerMask];
}
/// Inserts a pointer to a StaticInst object into the list of decoded
/// instructions on the page.
/// @param addr The address of the instruction.
/// @param si A pointer to the corresponding StaticInst object.
inline void insert(Addr addr, StaticInstPtr &si)
void
insert(Addr addr, StaticInstPtr &si)
{
instructions[addr & lowerMask] = si;
valid[addr & lowerMask] = true;
}
};
@ -656,7 +635,7 @@ StaticInst::decode(StaticInst::ExtMachInst mach_inst, Addr addr)
}
// creates a new object for a page of decoded instructions
AddrDecodePage * decodePage = new AddrDecodePage;
AddrDecodePage *decodePage = new AddrDecodePage;
addrDecodeCache[page_addr] = decodePage;
updateCache(page_addr, decodePage);
return searchCache(mach_inst, addr, decodePage);
@ -664,7 +643,7 @@ StaticInst::decode(StaticInst::ExtMachInst mach_inst, Addr addr)
inline StaticInstPtr
StaticInst::searchCache(ExtMachInst mach_inst, Addr addr,
AddrDecodePage * decodePage)
AddrDecodePage *decodePage)
{
DecodeCache::iterator iter = decodeCache.find(mach_inst);
if (iter != decodeCache.end()) {