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Code Issues Actions 2 Packages Projects Releases Wiki Activity

intercept SIGSEGV and throw NullPointerExceptions

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This commit is contained in:
Joel Dice
2007-12-31 15:40:56 -07:00
parent 069a760918
commit f151d85f4e
6 changed files with 724 additions and 601 deletions
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650
src/compile.cpp
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541
src/compiler.cpp
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28
src/compiler.h
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@ -2,6 +2,7 @@
#define COMPILER_H
#include "system.h"
#include "zone.h"
namespace vm {
@ -20,18 +21,15 @@ class Promise {
class Compiler {
public:
class NullHandler {
class TraceHandler {
public:
virtual ~NullHandler() { }
virtual ~TraceHandler() { }
virtual void handleMaybeNull(Promise* address) = 0;
virtual void handleTrace(Promise* address) = 0;
};
virtual ~Compiler() { }
virtual void setNullHandler(NullHandler*) = 0;
virtual Promise* machineIp() = 0;
virtual Promise* machineIp(unsigned logicalIp) = 0;
virtual Promise* poolAppend(intptr_t) = 0;
@ -44,7 +42,7 @@ class Compiler {
int displacement = 0,
Operand* index = 0,
unsigned scale = 1,
bool maybeNull = false) = 0;
TraceHandler* traceHandler = 0) = 0;
virtual Operand* stack() = 0;
virtual Operand* base() = 0;
@ -58,15 +56,17 @@ class Compiler {
virtual Operand* label() = 0;
virtual void mark(Operand*) = 0;
virtual Promise* indirectCall
(Operand* address, unsigned argumentCount, ...) = 0;
virtual void indirectCall
(Operand* address, TraceHandler* traceHandler,
unsigned argumentCount, ...) = 0;
virtual void indirectCallNoReturn
(Operand* address, unsigned argumentCount, ...) = 0;
virtual Promise* directCall
(Operand* address, TraceHandler* traceHandler,
unsigned argumentCount, ...) = 0;
virtual void directCall
(Operand* address, unsigned argumentCount, ...) = 0;
virtual void call(Operand*) = 0;
virtual void alignedCall(Operand*) = 0;
virtual void call(Operand*, TraceHandler*) = 0;
virtual void alignedCall(Operand*, TraceHandler*) = 0;
virtual void return4(Operand*) = 0;
virtual void return8(Operand*) = 0;
virtual void ret() = 0;
@ -141,7 +141,7 @@ class Compiler {
};
Compiler*
makeCompiler(System* system, void* indirectCaller);
makeCompiler(System* system, Zone* zone, void* indirectCaller);
} // namespace vm

10
src/posix.cpp
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@ -55,6 +55,12 @@ void
handleSignal(int signal, siginfo_t* info, void* context)
{
if (signal == SIGSEGV) {
sigset_t set;
sigemptyset(&set);
sigaddset(&set, SIGSEGV);
sigprocmask(SIG_UNBLOCK, &set, 0);
greg_t* registers
= static_cast<ucontext_t*>(context)->uc_mcontext.gregs;
@ -66,8 +72,10 @@ handleSignal(int signal, siginfo_t* info, void* context)
if (not handled) {
if (oldSegFaultHandler.sa_flags & SA_SIGINFO) {
oldSegFaultHandler.sa_sigaction(signal, info, context);
} else {
} else if (oldSegFaultHandler.sa_handler) {
oldSegFaultHandler.sa_handler(signal);
} else {
abort();
}
}
}