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redid the exception mechanism for script-side access violations to be of more use for diagnosing problems.

Browse source 
The original implementation just printed a mostly information-free message and then went on as if nothing has happened, making it ridiculously easy to write broken code and release it. Changed it to:

* Any VMAbortException will now terminate the game session and go back to the console.
* It will also print a VM stack trace with all open functions, including source file and line numbers pointing to the problem spots. For this the relevant information had to be added to the VMScriptFunction class.

An interesting effect here was that just throwing the exception object increased the VM's Exec function's stack size from 900 bytes to 70kb, because the compiler allocates a separate local buffer for every single instance of the exception object.
The obvious solution was to put this part into a subfunction so that it won't pollute the Exec function's own stack frame. Interesting side effect of this: Exec's stack requirement went down from 900 bytes to 600 bytes. This is still on the high side but already a lot better.
This commit is contained in:
Christoph Oelckers 2016-12-03 12:23:13 +01:00
parent d93b6e31d6
commit b3783a3850
9 changed files with 232 additions and 115 deletions
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6
src/d_main.cpp
View file

@ -1027,6 +1027,12 @@ void D_DoomLoop ()
}
D_ErrorCleanup ();
}
catch (CVMAbortException &error)
{
error.MaybePrintMessage();
Printf("%s", error.stacktrace);
D_ErrorCleanup();
}
}
}

31
src/info.cpp
View file

@ -89,16 +89,35 @@ bool FState::CallAction(AActor *self, AActor *stateowner, FStateParamInfo *info,
stateret = NULL;
}
}
if (stateret == NULL)
try
{
GlobalVMStack.Call(ActionFunc, params, ActionFunc->ImplicitArgs, NULL, 0, NULL);
if (stateret == NULL)
{
GlobalVMStack.Call(ActionFunc, params, ActionFunc->ImplicitArgs, NULL, 0, NULL);
}
else
{
VMReturn ret;
ret.PointerAt((void **)stateret);
GlobalVMStack.Call(ActionFunc, params, ActionFunc->ImplicitArgs, &ret, 1, NULL);
}
}
else
catch (CVMAbortException &err)
{
VMReturn ret;
ret.PointerAt((void **)stateret);
GlobalVMStack.Call(ActionFunc, params, ActionFunc->ImplicitArgs, &ret, 1, NULL);
err.MaybePrintMessage();
auto owner = FState::StaticFindStateOwner(this);
int offs = int(this - owner->OwnedStates);
const char *callinfo = "";
if (info != nullptr && info->mStateType == STATE_Psprite)
{
if (stateowner->IsKindOf(RUNTIME_CLASS(AWeapon)) && stateowner != self) callinfo = "weapon ";
else callinfo = "overlay ";
}
err.stacktrace.AppendFormat("Called from %sstate %s.%d in %s\n", callinfo, owner->TypeName.GetChars(), offs, stateowner->GetClass()->TypeName.GetChars());
throw;
throw;
}
ActionCycles.Unclock();
return true;
}

14
src/p_actionfunctions.cpp
View file

@ -183,7 +183,19 @@ bool ACustomInventory::CallStateChain (AActor *actor, FState *state)
numret = 2;
}
}
GlobalVMStack.Call(state->ActionFunc, params, state->ActionFunc->ImplicitArgs, wantret, numret);
try
{
GlobalVMStack.Call(state->ActionFunc, params, state->ActionFunc->ImplicitArgs, wantret, numret);
}
catch (CVMAbortException &err)
{
err.MaybePrintMessage();
auto owner = FState::StaticFindStateOwner(state);
int offs = int(state - owner->OwnedStates);
err.stacktrace.AppendFormat("Called from state %s.%d in inventory state chain in %s\n", owner->TypeName.GetChars(), offs, GetClass()->TypeName.GetChars());
throw;
}
// As long as even one state succeeds, the whole chain succeeds unless aborted below.
// A state that wants to jump does not count as "succeeded".
if (nextstate == NULL)

14
src/scripting/vm/vm.h
View file

@ -194,7 +194,8 @@ class CVMAbortException : public CDoomError
{
public:
static FString stacktrace;
CVMAbortException(EVMAbortException reason, const char *moreinfo, ...);
CVMAbortException(EVMAbortException reason, const char *moreinfo, va_list ap);
void MaybePrintMessage();
};
enum EVMOpMode
@ -808,6 +809,12 @@ union FVoidObj
void *v;
};
struct FStatementInfo
{
uint16_t InstructionIndex;
uint16_t LineNumber;
};
class VMScriptFunction : public VMFunction
{
DECLARE_CLASS(VMScriptFunction, VMFunction);
@ -815,12 +822,13 @@ public:
VMScriptFunction(FName name=NAME_None);
~VMScriptFunction();
size_t PropagateMark();
void Alloc(int numops, int numkonstd, int numkonstf, int numkonsts, int numkonsta);
void Alloc(int numops, int numkonstd, int numkonstf, int numkonsts, int numkonsta, int numlinenumbers);
VM_ATAG *KonstATags() { return (VM_UBYTE *)(KonstA + NumKonstA); }
const VM_ATAG *KonstATags() const { return (VM_UBYTE *)(KonstA + NumKonstA); }
VMOP *Code;
FStatementInfo *LineInfo;
FString SourceFileName;
int *KonstD;
double *KonstF;
@ -828,6 +836,7 @@ public:
FVoidObj *KonstA;
int ExtraSpace;
int CodeSize; // Size of code in instructions (not bytes)
unsigned LineInfoCount;
VM_UBYTE NumRegD;
VM_UBYTE NumRegF;
VM_UBYTE NumRegS;
@ -843,6 +852,7 @@ public:
void InitExtra(void *addr);
void DestroyExtra(void *addr);
int AllocExtraStack(PType *type);
int PCToLine(const VMOP *pc);
};
class VMFrameStack

7
src/scripting/vm/vmbuilder.cpp
View file

@ -88,7 +88,7 @@ void VMFunctionBuilder::BeginStatement(FxExpression *stmt)
// only add a new entry if the line number differs.
if (LineNumbers.Size() == 0 || stmt->ScriptPosition.ScriptLine != LineNumbers.Last().LineNumber)
{
StatementInfo si = { (uint16_t)Code.Size(), (uint16_t)stmt->ScriptPosition.ScriptLine };
FStatementInfo si = { (uint16_t)Code.Size(), (uint16_t)stmt->ScriptPosition.ScriptLine };
LineNumbers.Push(si);
}
StatementStack.Push(stmt);
@ -102,17 +102,18 @@ void VMFunctionBuilder::EndStatement()
// Re-enter the previous statement.
if (StatementStack.Size() > 0)
{
StatementInfo si = { (uint16_t)Code.Size(), (uint16_t)StatementStack.Last()->ScriptPosition.ScriptLine };
FStatementInfo si = { (uint16_t)Code.Size(), (uint16_t)StatementStack.Last()->ScriptPosition.ScriptLine };
LineNumbers.Push(si);
}
}
void VMFunctionBuilder::MakeFunction(VMScriptFunction *func)
{
func->Alloc(Code.Size(), IntConstantList.Size(), FloatConstantList.Size(), StringConstantList.Size(), AddressConstantList.Size());
func->Alloc(Code.Size(), IntConstantList.Size(), FloatConstantList.Size(), StringConstantList.Size(), AddressConstantList.Size(), LineNumbers.Size());
// Copy code block.
memcpy(func->Code, &Code[0], Code.Size() * sizeof(VMOP));
memcpy(func->LineInfo, &LineNumbers[0], LineNumbers.Size() * sizeof(LineNumbers[0]));
// Create constant tables.
if (IntConstantList.Size() > 0)

8
src/scripting/vm/vmbuilder.h
View file

@ -100,13 +100,7 @@ private:
VM_ATAG Tag;
};
struct StatementInfo
{
uint16_t InstructionIndex;
uint16_t LineNumber;
};
TArray<StatementInfo> LineNumbers;
TArray<FStatementInfo> LineNumbers;
TArray<FxExpression *> StatementStack;
TArray<int> IntConstantList;

60
src/scripting/vm/vmexec.cpp
View file

@ -40,6 +40,11 @@
#include "textures/textures.h"
#include "math/cmath.h"
// This must be a separate function because the VC compiler would otherwise allocate memory on the stack for every separate instance of the exception object that may get thrown.
void ThrowAbortException(EVMAbortException reason, const char *moreinfo, ...);
// intentionally implemented in a different source file tp prevent inlining.
void ThrowVMException(VMException *x);
#define IMPLEMENT_VMEXEC
#if !defined(COMPGOTO) && defined(__GNUC__)
@ -91,7 +96,7 @@
}
#define GETADDR(a,o,x) \
if (a == NULL) { throw CVMAbortException(x, nullptr); } \
if (a == NULL) { ThrowAbortException(x, nullptr); } \
ptr = (VM_SBYTE *)a + o
static const VM_UWORD ZapTable[16] =
@ -227,57 +232,4 @@ void VMFillParams(VMValue *params, VMFrame *callee, int numparam)
}
}
void NullParam(const char *varname)
{
throw CVMAbortException(X_READ_NIL, "In function parameter %s", varname);
}
FString CVMAbortException::stacktrace;
CVMAbortException::CVMAbortException(EVMAbortException reason, const char *moreinfo, ...)
{
SetMessage("VM execution aborted: ");
switch (reason)
{
case X_READ_NIL:
AppendMessage("tried to read from address zero.");
break;
case X_WRITE_NIL:
AppendMessage("tried to write to address zero.");
break;
case X_TOO_MANY_TRIES:
AppendMessage("too many try-catch blocks.");
break;
case X_ARRAY_OUT_OF_BOUNDS:
AppendMessage("array access out of bounds.");
break;
case X_DIVISION_BY_ZERO:
AppendMessage("division by zero.");
break;
case X_BAD_SELF:
AppendMessage("invalid self pointer.");
break;
default:
{
size_t len = strlen(m_Message);
mysnprintf(m_Message + len, MAX_ERRORTEXT - len, "Unknown reason %d", reason);
break;
}
}
if (moreinfo != nullptr)
{
AppendMessage(" ");
va_list ap;
va_start(ap, moreinfo);
size_t len = strlen(m_Message);
myvsnprintf(m_Message + len, MAX_ERRORTEXT - len, moreinfo, ap);
va_end(ap);
}
}

78
src/scripting/vm/vmexec.h
View file

@ -2,7 +2,6 @@
#error vmexec.h must not be #included outside vmexec.cpp. Use vm.h instead.
#endif
static int Exec(VMFrameStack *stack, const VMOP *pc, VMReturn *ret, int numret)
{
#if COMPGOTO
@ -596,7 +595,17 @@ begin:
FillReturns(reg, f, returns, pc+1, C);
if (call->Native)
{
numret = static_cast<VMNativeFunction *>(call)->NativeCall(reg.param + f->NumParam - B, call->DefaultArgs, B, returns, C);
try
{
numret = static_cast<VMNativeFunction *>(call)->NativeCall(reg.param + f->NumParam - B, call->DefaultArgs, B, returns, C);
}
catch (CVMAbortException &err)
{
err.MaybePrintMessage();
err.stacktrace.AppendFormat("Called from %s\n", call->PrintableName.GetChars());
// PrintParameters(reg.param + f->NumParam - B, B);
throw;
}
}
else
{
@ -640,7 +649,17 @@ begin:
if (call->Native)
{
return static_cast<VMNativeFunction *>(call)->NativeCall(reg.param + f->NumParam - B, call->DefaultArgs, B, ret, numret);
try
{
return static_cast<VMNativeFunction *>(call)->NativeCall(reg.param + f->NumParam - B, call->DefaultArgs, B, ret, numret);
}
catch (CVMAbortException &err)
{
err.MaybePrintMessage();
err.stacktrace.AppendFormat("Called from %s\n", call->PrintableName.GetChars());
// PrintParameters(reg.param + f->NumParam - B, B);
throw;
}
}
else
{ // FIXME: Not a true tail call
@ -704,7 +723,7 @@ begin:
assert(try_depth < MAX_TRY_DEPTH);
if (try_depth >= MAX_TRY_DEPTH)
{
throw CVMAbortException(X_TOO_MANY_TRIES, nullptr);
ThrowAbortException(X_TOO_MANY_TRIES, nullptr);
}
assert((pc + JMPOFS(pc) + 1)->op == OP_CATCH);
exception_frames[try_depth++] = pc + JMPOFS(pc) + 1;
@ -717,17 +736,17 @@ begin:
if (a == 0)
{
ASSERTA(B);
throw((VMException *)reg.a[B]);
ThrowVMException((VMException *)reg.a[B]);
}
else if (a == 1)
{
ASSERTKA(B);
assert(konstatag[B] == ATAG_OBJECT);
throw((VMException *)konsta[B].o);
ThrowVMException((VMException *)konsta[B].o);
}
else
{
throw CVMAbortException(EVMAbortException(BC), nullptr);
ThrowAbortException(EVMAbortException(BC), nullptr);
}
NEXTOP;
OP(CATCH):
@ -739,7 +758,7 @@ begin:
OP(BOUND):
if (reg.d[a] >= BC)
{
throw CVMAbortException(X_ARRAY_OUT_OF_BOUNDS, "Max.index = %u, current index = %u\n", BC, reg.d[a]);
ThrowAbortException(X_ARRAY_OUT_OF_BOUNDS, "Max.index = %u, current index = %u\n", BC, reg.d[a]);
}
NEXTOP;
@ -747,7 +766,7 @@ begin:
ASSERTKD(BC);
if (reg.d[a] >= konstd[BC])
{
throw CVMAbortException(X_ARRAY_OUT_OF_BOUNDS, "Max.index = %u, current index = %u\n", konstd[BC], reg.d[a]);
ThrowAbortException(X_ARRAY_OUT_OF_BOUNDS, "Max.index = %u, current index = %u\n", konstd[BC], reg.d[a]);
}
NEXTOP;
@ -755,7 +774,7 @@ begin:
ASSERTD(B);
if (reg.d[a] >= reg.d[B])
{
throw CVMAbortException(X_ARRAY_OUT_OF_BOUNDS, "Max.index = %u, current index = %u\n", reg.d[B], reg.d[a]);
ThrowAbortException(X_ARRAY_OUT_OF_BOUNDS, "Max.index = %u, current index = %u\n", reg.d[B], reg.d[a]);
}
NEXTOP;
@ -902,7 +921,7 @@ begin:
ASSERTD(a); ASSERTD(B); ASSERTD(C);
if (reg.d[C] == 0)
{
throw CVMAbortException(X_DIVISION_BY_ZERO, nullptr);
ThrowAbortException(X_DIVISION_BY_ZERO, nullptr);
}
reg.d[a] = reg.d[B] / reg.d[C];
NEXTOP;
@ -910,7 +929,7 @@ begin:
ASSERTD(a); ASSERTD(B); ASSERTKD(C);
if (konstd[C] == 0)
{
throw CVMAbortException(X_DIVISION_BY_ZERO, nullptr);
ThrowAbortException(X_DIVISION_BY_ZERO, nullptr);
}
reg.d[a] = reg.d[B] / konstd[C];
NEXTOP;
@ -918,7 +937,7 @@ begin:
ASSERTD(a); ASSERTKD(B); ASSERTD(C);
if (reg.d[C] == 0)
{
throw CVMAbortException(X_DIVISION_BY_ZERO, nullptr);
ThrowAbortException(X_DIVISION_BY_ZERO, nullptr);
}
reg.d[a] = konstd[B] / reg.d[C];
NEXTOP;
@ -927,7 +946,7 @@ begin:
ASSERTD(a); ASSERTD(B); ASSERTD(C);
if (reg.d[C] == 0)
{
throw CVMAbortException(X_DIVISION_BY_ZERO, nullptr);
ThrowAbortException(X_DIVISION_BY_ZERO, nullptr);
}
reg.d[a] = int((unsigned)reg.d[B] / (unsigned)reg.d[C]);
NEXTOP;
@ -935,7 +954,7 @@ begin:
ASSERTD(a); ASSERTD(B); ASSERTKD(C);
if (konstd[C] == 0)
{
throw CVMAbortException(X_DIVISION_BY_ZERO, nullptr);
ThrowAbortException(X_DIVISION_BY_ZERO, nullptr);
}
reg.d[a] = int((unsigned)reg.d[B] / (unsigned)konstd[C]);
NEXTOP;
@ -943,7 +962,7 @@ begin:
ASSERTD(a); ASSERTKD(B); ASSERTD(C);
if (reg.d[C] == 0)
{
throw CVMAbortException(X_DIVISION_BY_ZERO, nullptr);
ThrowAbortException(X_DIVISION_BY_ZERO, nullptr);
}
reg.d[a] = int((unsigned)konstd[B] / (unsigned)reg.d[C]);
NEXTOP;
@ -952,7 +971,7 @@ begin:
ASSERTD(a); ASSERTD(B); ASSERTD(C);
if (reg.d[C] == 0)
{
throw CVMAbortException(X_DIVISION_BY_ZERO, nullptr);
ThrowAbortException(X_DIVISION_BY_ZERO, nullptr);
}
reg.d[a] = reg.d[B] % reg.d[C];
NEXTOP;
@ -960,7 +979,7 @@ begin:
ASSERTD(a); ASSERTD(B); ASSERTKD(C);
if (konstd[C] == 0)
{
throw CVMAbortException(X_DIVISION_BY_ZERO, nullptr);
ThrowAbortException(X_DIVISION_BY_ZERO, nullptr);
}
reg.d[a] = reg.d[B] % konstd[C];
NEXTOP;
@ -968,7 +987,7 @@ begin:
ASSERTD(a); ASSERTKD(B); ASSERTD(C);
if (reg.d[C] == 0)
{
throw CVMAbortException(X_DIVISION_BY_ZERO, nullptr);
ThrowAbortException(X_DIVISION_BY_ZERO, nullptr);
}
reg.d[a] = konstd[B] % reg.d[C];
NEXTOP;
@ -977,7 +996,7 @@ begin:
ASSERTD(a); ASSERTD(B); ASSERTD(C);
if (reg.d[C] == 0)
{
throw CVMAbortException(X_DIVISION_BY_ZERO, nullptr);
ThrowAbortException(X_DIVISION_BY_ZERO, nullptr);
}
reg.d[a] = int((unsigned)reg.d[B] % (unsigned)reg.d[C]);
NEXTOP;
@ -985,7 +1004,7 @@ begin:
ASSERTD(a); ASSERTD(B); ASSERTKD(C);
if (konstd[C] == 0)
{
throw CVMAbortException(X_DIVISION_BY_ZERO, nullptr);
ThrowAbortException(X_DIVISION_BY_ZERO, nullptr);
}
reg.d[a] = int((unsigned)reg.d[B] % (unsigned)konstd[C]);
NEXTOP;
@ -993,7 +1012,7 @@ begin:
ASSERTD(a); ASSERTKD(B); ASSERTD(C);
if (reg.d[C] == 0)
{
throw CVMAbortException(X_DIVISION_BY_ZERO, nullptr);
ThrowAbortException(X_DIVISION_BY_ZERO, nullptr);
}
reg.d[a] = int((unsigned)konstd[B] % (unsigned)reg.d[C]);
NEXTOP;
@ -1171,7 +1190,7 @@ begin:
ASSERTF(a); ASSERTF(B); ASSERTF(C);
if (reg.f[C] == 0.)
{
throw CVMAbortException(X_DIVISION_BY_ZERO, nullptr);
ThrowAbortException(X_DIVISION_BY_ZERO, nullptr);
}
reg.f[a] = reg.f[B] / reg.f[C];
NEXTOP;
@ -1179,7 +1198,7 @@ begin:
ASSERTF(a); ASSERTF(B); ASSERTKF(C);
if (konstf[C] == 0.)
{
throw CVMAbortException(X_DIVISION_BY_ZERO, nullptr);
ThrowAbortException(X_DIVISION_BY_ZERO, nullptr);
}
reg.f[a] = reg.f[B] / konstf[C];
NEXTOP;
@ -1187,7 +1206,7 @@ begin:
ASSERTF(a); ASSERTKF(B); ASSERTF(C);
if (reg.f[C] == 0.)
{
throw CVMAbortException(X_DIVISION_BY_ZERO, nullptr);
ThrowAbortException(X_DIVISION_BY_ZERO, nullptr);
}
reg.f[a] = konstf[B] / reg.f[C];
NEXTOP;
@ -1198,7 +1217,7 @@ begin:
Do_MODF:
if (fc == 0.)
{
throw CVMAbortException(X_DIVISION_BY_ZERO, nullptr);
ThrowAbortException(X_DIVISION_BY_ZERO, nullptr);
}
reg.f[a] = luai_nummod(fb, fc);
NEXTOP;
@ -1611,6 +1630,13 @@ begin:
// Nothing caught it. Rethrow and let somebody else deal with it.
throw;
}
catch (CVMAbortException &err)
{
err.MaybePrintMessage();
err.stacktrace.AppendFormat("Called from %s at %s, line %d\n", sfunc->PrintableName.GetChars(), sfunc->SourceFileName.GetChars(), sfunc->PCToLine(pc));
// PrintParameters(reg.param + f->NumParam - B, B);
throw;
}
return 0;
}

129
src/scripting/vm/vmframe.cpp
View file

@ -3,6 +3,7 @@
**
**---------------------------------------------------------------------------
** Copyright -2016 Randy Heit
** Copyright 2016 Christoph Oelckers
** All rights reserved.
**
** Redistribution and use in source and binary forms, with or without
@ -33,6 +34,7 @@
#include <new>
#include "dobject.h"
#include "v_text.h"
IMPLEMENT_CLASS(VMException, false, false)
IMPLEMENT_CLASS(VMFunction, true, true)
@ -48,11 +50,13 @@ VMScriptFunction::VMScriptFunction(FName name)
{
Native = false;
Name = name;
LineInfo = nullptr;
Code = NULL;
KonstD = NULL;
KonstF = NULL;
KonstS = NULL;
KonstA = NULL;
LineInfoCount = 0;
ExtraSpace = 0;
CodeSize = 0;
NumRegD = 0;
@ -82,7 +86,7 @@ VMScriptFunction::~VMScriptFunction()
}
}
void VMScriptFunction::Alloc(int numops, int numkonstd, int numkonstf, int numkonsts, int numkonsta)
void VMScriptFunction::Alloc(int numops, int numkonstd, int numkonstf, int numkonsts, int numkonsta, int numlinenumbers)
{
assert(Code == NULL);
assert(numops > 0);
@ -90,14 +94,27 @@ void VMScriptFunction::Alloc(int numops, int numkonstd, int numkonstf, int numko
assert(numkonstf >= 0 && numkonstf <= 65535);
assert(numkonsts >= 0 && numkonsts <= 65535);
assert(numkonsta >= 0 && numkonsta <= 65535);
assert(numlinenumbers >= 0 && numlinenumbers <= 65535);
void *mem = M_Malloc(numops * sizeof(VMOP) +
numkonstd * sizeof(int) +
numkonstf * sizeof(double) +
numkonsts * sizeof(FString) +
numkonsta * (sizeof(FVoidObj) + 1));
numkonsta * (sizeof(FVoidObj) + 1) +
numlinenumbers * sizeof(FStatementInfo));
Code = (VMOP *)mem;
mem = (void *)((VMOP *)mem + numops);
if (numlinenumbers > 0)
{
LineInfo = (FStatementInfo*)mem;
LineInfoCount = numlinenumbers;
mem = LineInfo + numlinenumbers;
}
else
{
LineInfo = nullptr;
LineInfoCount = 0;
}
if (numkonstd > 0)
{
KonstD = (int *)mem;
@ -190,6 +207,20 @@ int VMScriptFunction::AllocExtraStack(PType *type)
return address;
}
int VMScriptFunction::PCToLine(const VMOP *pc)
{
int PCIndex = int(pc - Code);
if (LineInfoCount == 1) return LineInfo[0].LineNumber;
for (unsigned i = 1; i < LineInfoCount; i++)
{
if (LineInfo[i].InstructionIndex > PCIndex)
{
return LineInfo[i - 1].LineNumber;
}
}
return -1;
}
//===========================================================================
//
// VMFrame :: InitRegS
@ -453,20 +484,6 @@ int VMFrameStack::Call(VMFunction *func, VMValue *params, int numparams, VMRetur
}
throw;
}
catch (CVMAbortException &exception)
{
if (allocated)
{
PopFrame();
}
if (trap != nullptr)
{
*trap = nullptr;
}
Printf("%s\n", exception.GetMessage());
return -1;
}
catch (...)
{
if (allocated)
@ -476,3 +493,83 @@ int VMFrameStack::Call(VMFunction *func, VMValue *params, int numparams, VMRetur
throw;
}
}
// Exception stuff for the VM is intentionally placed there, because having this in vmexec.cpp would subject it to inlining
// which we do not want because it increases the local stack requirements of Exec which are already too high.
FString CVMAbortException::stacktrace;
CVMAbortException::CVMAbortException(EVMAbortException reason, const char *moreinfo, va_list ap)
{
SetMessage("VM execution aborted: ");
switch (reason)
{
case X_READ_NIL:
AppendMessage("tried to read from address zero.");
break;
case X_WRITE_NIL:
AppendMessage("tried to write to address zero.");
break;
case X_TOO_MANY_TRIES:
AppendMessage("too many try-catch blocks.");
break;
case X_ARRAY_OUT_OF_BOUNDS:
AppendMessage("array access out of bounds.");
break;
case X_DIVISION_BY_ZERO:
AppendMessage("division by zero.");
break;
case X_BAD_SELF:
AppendMessage("invalid self pointer.");
break;
default:
{
size_t len = strlen(m_Message);
mysnprintf(m_Message + len, MAX_ERRORTEXT - len, "Unknown reason %d", reason);
break;
}
}
if (moreinfo != nullptr)
{
AppendMessage(" ");
size_t len = strlen(m_Message);
myvsnprintf(m_Message + len, MAX_ERRORTEXT - len, moreinfo, ap);
}
stacktrace = "";
}
// Print this only once on the first catch block.
void CVMAbortException::MaybePrintMessage()
{
auto m = GetMessage();
if (m != nullptr)
{
Printf(TEXTCOLOR_RED);
Printf("%s\n", m);
SetMessage("");
}
}
void ThrowAbortException(EVMAbortException reason, const char *moreinfo, ...)
{
va_list ap;
va_start(ap, moreinfo);
throw CVMAbortException(reason, moreinfo, ap);
va_end(ap);
}
void NullParam(const char *varname)
{
ThrowAbortException(X_READ_NIL, "In function parameter %s", varname);
}
void ThrowVMException(VMException *x)
{
throw x;
}