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eh.d
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eh.d
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/**
* Support for exception handling for EH_DM and EH_WIN32.
* Generate exception handling tables.
*
* Copyright: Copyright (C) 1994-1998 by Symantec
* Copyright (C) 2000-2022 by The D Language Foundation, All Rights Reserved
* Authors: $(LINK2 https://www.digitalmars.com, Walter Bright)
* License: $(LINK2 https://www.boost.org/LICENSE_1_0.txt, Boost License 1.0)
* Source: $(LINK2 https://github.com/dlang/dmd/blob/master/src/dmd/eh.d, _eh.d)
* Documentation: https://dlang.org/phobos/dmd_eh.html
* Coverage: https://codecov.io/gh/dlang/dmd/src/master/src/dmd/eh.d
*/
module dmd.eh;
import core.stdc.stdio;
import core.stdc.stdlib;
import core.stdc.string;
import dmd.globals;
import dmd.errors;
import dmd.target;
import dmd.root.rmem;
import dmd.backend.barray;
import dmd.backend.cc;
import dmd.backend.cdef;
import dmd.backend.code;
import dmd.backend.code_x86;
import dmd.backend.dt;
import dmd.backend.el;
import dmd.backend.global;
import dmd.backend.obj;
import dmd.backend.ty;
import dmd.backend.type;
extern (C++):
package(dmd) @property @nogc nothrow auto NPTRSIZE() { return _tysize[TYnptr]; }
/****************************
* Generate and output scope table.
*/
Symbol *except_gentables()
{
//printf("except_gentables()\n");
if (config.ehmethod == EHmethod.EH_DM && !(funcsym_p.Sfunc.Fflags3 & Feh_none))
{
// BUG: alloca() changes the stack size, which is not reflected
// in the fixed eh tables.
if (Alloca.size)
error(null, 0, 0, "cannot mix `core.std.stdlib.alloca()` and exception handling in `%s()`", &funcsym_p.Sident[0]);
char[13+5+1] name = void;
__gshared int tmpnum;
sprintf(name.ptr,"_HandlerTable%d",tmpnum++);
Symbol *s = symbol_name(name.ptr,SCstatic,tstypes[TYint]);
symbol_keep(s);
//symbol_debug(s);
except_fillInEHTable(s);
outdata(s); // output the scope table
objmod.ehtables(funcsym_p,cast(uint)funcsym_p.Ssize,s);
}
return null;
}
/**********************************************
* Initializes the Symbol s with the contents of the exception handler table.
*/
/* This is what the type should be on the target machine, not the host compiler
*
* struct Guard
* {
* if (EHmethod.EH_DM)
* {
* uint offset; // offset of start of guarded section (Linux)
* uint endoffset; // ending offset of guarded section (Linux)
* }
* int last_index; // previous index (enclosing guarded section)
* uint catchoffset; // offset to catch block from Symbol
* void *finally; // finally code to execute
* }
*/
void except_fillInEHTable(Symbol *s)
{
uint fsize = NPTRSIZE; // target size of function pointer
auto dtb = DtBuilder(0);
/*
void* pointer to start of function (Windows)
uint offset of ESP from EBP
uint offset from start of function to return code
uint nguards; // dimension of guard[] (Linux)
Guard guard[]; // sorted such that the enclosing guarded sections come first
catchoffset:
uint ncatches; // number of catch blocks
{ void *type; // Symbol representing type
uint bpoffset; // EBP offset of catch variable
void *handler; // catch handler code
} catch[];
*/
/* Be careful of this, as we need the sizeof Guard on the target, not
* in the compiler.
*/
uint GUARD_SIZE;
if (config.ehmethod == EHmethod.EH_DM)
GUARD_SIZE = (target.is64bit ? 3*8 : 5*4);
else if (config.ehmethod == EHmethod.EH_WIN32)
GUARD_SIZE = 3*4;
else
assert(0);
int sz = 0;
// Address of start of function
if (config.ehmethod == EHmethod.EH_WIN32)
{
//symbol_debug(funcsym_p);
dtb.xoff(funcsym_p,0,TYnptr);
sz += fsize;
}
//printf("ehtables: func = %s, offset = x%x, startblock.Boffset = x%x\n", funcsym_p.Sident, funcsym_p.Soffset, startblock.Boffset);
// Get offset of ESP from EBP
long spoff = cod3_spoff();
dtb.dword(cast(int)spoff);
sz += 4;
// Offset from start of function to return code
dtb.dword(cast(int)retoffset);
sz += 4;
// First, calculate starting catch offset
int guarddim = 0; // max dimension of guard[]
int ndctors = 0; // number of ESCdctor's
foreach (b; BlockRange(startblock))
{
if (b.BC == BC_try && b.Bscope_index >= guarddim)
guarddim = b.Bscope_index + 1;
// printf("b.BC = %2d, Bscope_index = %2d, last_index = %2d, offset = x%x\n",
// b.BC, b.Bscope_index, b.Blast_index, b.Boffset);
if (usednteh & EHcleanup)
for (code *c = b.Bcode; c; c = code_next(c))
{
if (c.Iop == (ESCAPE | ESCddtor))
ndctors++;
}
}
//printf("guarddim = %d, ndctors = %d\n", guarddim, ndctors);
if (config.ehmethod == EHmethod.EH_DM)
{
dtb.size(guarddim + ndctors);
sz += NPTRSIZE;
}
uint catchoffset = sz + (guarddim + ndctors) * GUARD_SIZE;
// Generate guard[]
int i = 0;
foreach (b; BlockRange(startblock))
{
//printf("b = %p, b.Btry = %p, b.offset = %x\n", b, b.Btry, b.Boffset);
if (b.BC == BC_try)
{
assert(b.Bscope_index >= i);
if (i < b.Bscope_index)
{ int fillsize = (b.Bscope_index - i) * GUARD_SIZE;
dtb.nzeros( fillsize);
sz += fillsize;
}
i = b.Bscope_index + 1;
int nsucc = b.numSucc();
if (config.ehmethod == EHmethod.EH_DM)
{
//printf("DHandlerInfo: offset = %x", cast(int)(b.Boffset - startblock.Boffset));
dtb.dword(cast(int)(b.Boffset - startblock.Boffset)); // offset to start of block
// Compute ending offset
uint endoffset;
for (block *bn = b.Bnext; 1; bn = bn.Bnext)
{
//printf("\tbn = %p, bn.Btry = %p, bn.offset = %x\n", bn, bn.Btry, bn.Boffset);
assert(bn);
if (bn.Btry == b.Btry)
{ endoffset = cast(uint)(bn.Boffset - startblock.Boffset);
break;
}
}
//printf(" endoffset = %x, prev_index = %d\n", endoffset, b.Blast_index);
dtb.dword(endoffset); // offset past end of guarded block
}
dtb.dword(b.Blast_index); // parent index
if (b.jcatchvar) // if try-catch
{
assert(catchoffset);
dtb.dword(catchoffset);
dtb.size(0); // no finally handler
catchoffset += NPTRSIZE + (nsucc - 1) * (3 * NPTRSIZE);
}
else // else try-finally
{
assert(nsucc == 2);
dtb.dword(0); // no catch offset
block *bhandler = b.nthSucc(1);
assert(bhandler.BC == BC_finally);
// To successor of BC_finally block
bhandler = bhandler.nthSucc(0);
// finally handler address
if (config.ehmethod == EHmethod.EH_DM)
{
assert(bhandler.Boffset > startblock.Boffset);
dtb.size(bhandler.Boffset - startblock.Boffset); // finally handler offset
}
else
dtb.coff(cast(uint)bhandler.Boffset);
}
sz += GUARD_SIZE;
}
}
/* Append to guard[] the guard blocks for temporaries that are created and destroyed
* within a single expression. These are marked by the special instruction pairs
* (ESCAPE | ESCdctor) and (ESCAPE | ESCddtor).
*/
if (usednteh & EHcleanup)
{
Barray!int stack;
int scopeindex = guarddim;
foreach (b; BlockRange(startblock))
{
/* Set up stack of scope indices
*/
stack.push(b.Btry ? b.Btry.Bscope_index : -1);
uint boffset = cast(uint)b.Boffset;
for (code *c = b.Bcode; c; c = code_next(c))
{
if (c.Iop == (ESCAPE | ESCdctor))
{
code *c2 = code_next(c);
if (config.ehmethod == EHmethod.EH_WIN32)
nteh_patchindex(c2, scopeindex);
if (config.ehmethod == EHmethod.EH_DM)
dtb.dword(cast(int)(boffset - startblock.Boffset)); // guard offset
// Find corresponding ddtor instruction
int n = 0;
uint eoffset = boffset;
uint foffset;
for (; 1; c2 = code_next(c2))
{
// https://issues.dlang.org/show_bug.cgi?id=13720
// optimizer might elide the corresponding ddtor
if (!c2)
goto Lnodtor;
if (c2.Iop == (ESCAPE | ESCddtor))
{
if (n)
n--;
else
{
foffset = eoffset;
code *cf = code_next(c2);
if (config.ehmethod == EHmethod.EH_WIN32)
{
nteh_patchindex(cf, stack[stack.length - 1]);
foffset += calccodsize(cf);
cf = code_next(cf);
}
foffset += calccodsize(cf);
while (!cf.isJumpOP())
{
cf = code_next(cf);
foffset += calccodsize(cf);
}
// issue 9438
//cf = code_next(cf);
//foffset += calccodsize(cf);
if (config.ehmethod == EHmethod.EH_DM)
dtb.dword(cast(int)(eoffset - startblock.Boffset)); // guard offset
break;
}
}
else if (c2.Iop == (ESCAPE | ESCdctor))
{
n++;
}
else
eoffset += calccodsize(c2);
}
//printf("boffset = %x, eoffset = %x, foffset = %x\n", boffset, eoffset, foffset);
dtb.dword(stack[stack.length - 1]); // parent index
dtb.dword(0); // no catch offset
if (config.ehmethod == EHmethod.EH_DM)
{
assert(foffset > startblock.Boffset);
dtb.size(foffset - startblock.Boffset); // finally handler offset
}
else
dtb.coff(foffset); // finally handler address
stack.push(scopeindex);
++scopeindex;
sz += GUARD_SIZE;
}
else if (c.Iop == (ESCAPE | ESCddtor))
{
stack.setLength(stack.length - 1);
assert(stack.length != 0);
}
Lnodtor:
boffset += calccodsize(c);
}
}
stack.dtor();
}
// Generate catch[]
foreach (b; BlockRange(startblock))
{
if (b.BC == BC_try && b.jcatchvar) // if try-catch
{
int nsucc = b.numSucc();
dtb.size(nsucc - 1); // # of catch blocks
sz += NPTRSIZE;
for (int j = 1; j < nsucc; ++j)
{
block *bcatch = b.nthSucc(j);
dtb.xoff(bcatch.Bcatchtype,0,TYnptr);
dtb.size(cod3_bpoffset(b.jcatchvar)); // EBP offset
// catch handler address
if (config.ehmethod == EHmethod.EH_DM)
{
assert(bcatch.Boffset > startblock.Boffset);
dtb.size(bcatch.Boffset - startblock.Boffset); // catch handler offset
}
else
dtb.coff(cast(uint)bcatch.Boffset);
sz += 3 * NPTRSIZE;
}
}
}
assert(sz != 0);
s.Sdt = dtb.finish();
}