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c47bfbcc3233a6e82a64a8a775248cc4ffbf3642
ldc/gen/asmstmt.cpp
Tomas Lindquist Olsen 1fac40d2bd Update to work with LLVM 2.7. 
Removed use of dyn_cast, llvm no compiles
without exceptions and rtti by
default. We do need exceptions for the libconfig stuff, but rtti isn't
necessary (anymore).

Debug info needs to be rewritten, as in LLVM 2.7 the format has
completely changed. To have something to look at while rewriting, the
old code has been wrapped inside #ifndef DISABLE_DEBUG_INFO , this means
that you have to define this to compile at the moment.

Updated tango 0.99.9 patch to include updated EH runtime code, which is
needed for LLVM 2.7 as well.
2010-05-19 12:42:32 +02:00

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// Taken from GDC source tree. Original by David Friedman.
// Released under the Artistic License found in dmd/artistic.txt
#include "gen/llvm.h"
#include "llvm/InlineAsm.h"
//#include "d-gcc-includes.h"
//#include "total.h"
#include "mars.h"
#include "statement.h"
#include "scope.h"
#include "declaration.h"
#include "dsymbol.h"
#include <cassert>
#include <deque>
#include <cstring>
#include <string>
#include <sstream>
//#include "d-lang.h"
//#include "d-codegen.h"
#include "gen/irstate.h"
#include "gen/dvalue.h"
#include "gen/tollvm.h"
#include "gen/logger.h"
#include "gen/todebug.h"
#include "gen/llvmhelpers.h"
#include "gen/functions.h"
typedef enum {
Arg_Integer,
Arg_Pointer,
Arg_Memory,
Arg_FrameRelative,
Arg_LocalSize,
Arg_Dollar
} AsmArgType;
typedef enum {
Mode_Input,
Mode_Output,
Mode_Update
} AsmArgMode;
struct AsmArg {
Expression * expr;
AsmArgType type;
AsmArgMode mode;
AsmArg(AsmArgType type, Expression * expr, AsmArgMode mode) {
this->type = type;
this->expr = expr;
this->mode = mode;
}
};
struct AsmCode {
std::string insnTemplate;
std::vector<AsmArg> args;
std::vector<bool> regs;
unsigned dollarLabel;
int clobbersMemory;
AsmCode(int n_regs) {
regs.resize(n_regs, false);
dollarLabel = 0;
clobbersMemory = 0;
}
};
AsmStatement::AsmStatement(Loc loc, Token *tokens) :
Statement(loc)
{
this->tokens = tokens; // Do I need to copy these?
asmcode = 0;
asmalign = 0;
refparam = 0;
naked = 0;
isBranchToLabel = NULL;
}
Statement *AsmStatement::syntaxCopy()
{
// copy tokens? copy 'code'?
AsmStatement * a_s = new AsmStatement(loc,tokens);
a_s->asmcode = asmcode;
a_s->refparam = refparam;
a_s->naked = naked;
return a_s;
}
void AsmStatement::toCBuffer(OutBuffer *buf, HdrGenState *hgs)
{
bool sep = 0, nsep = 0;
buf->writestring("asm { ");
for (Token * t = tokens; t; t = t->next) {
switch (t->value) {
case TOKlparen:
case TOKrparen:
case TOKlbracket:
case TOKrbracket:
case TOKcolon:
case TOKsemicolon:
case TOKcomma:
case TOKstring:
case TOKcharv:
case TOKwcharv:
case TOKdcharv:
nsep = 0;
break;
default:
nsep = 1;
}
if (sep + nsep == 2)
buf->writeByte(' ');
sep = nsep;
buf->writestring(t->toChars());
}
buf->writestring("; }");
buf->writenl();
}
int AsmStatement::comeFrom()
{
return FALSE;
}
struct AsmParserCommon
{
virtual void run(Scope* sc, AsmStatement* asmst) = 0;
virtual std::string getRegName(int i) = 0;
};
AsmParserCommon* asmparser = NULL;
#include "asm-x86-32.h"
#include "asm-x86-64.h"
bool d_have_inline_asm() { return true; }
Statement *AsmStatement::semantic(Scope *sc)
{
bool err = false;
if ((global.params.cpu != ARCHx86) && (global.params.cpu != ARCHx86_64))
{
error("inline asm is not supported for the \"%s\" architecture", global.params.llvmArch);
err = true;
}
if (!global.params.useInlineAsm)
{
error("inline asm is not allowed when the -noasm switch is used");
err = true;
}
if (err)
fatal();
//puts(toChars());
sc->func->inlineAsm = 1;
sc->func->inlineStatus = ILSno; // %% not sure
// %% need to set DECL_UNINLINABLE too?
sc->func->hasReturnExp = 1; // %% DMD does this, apparently...
// empty statement -- still do the above things because they might be expected?
if (! tokens)
return this;
if (!asmparser)
if (global.params.cpu == ARCHx86)
asmparser = new AsmParserx8632::AsmParser;
else if (global.params.cpu == ARCHx86_64)
asmparser = new AsmParserx8664::AsmParser;
asmparser->run(sc, this);
return this;
}
int AsmStatement::blockExit()
{
//printf("AsmStatement::blockExit(%p)\n", this);
return BEfallthru | BEreturn | BEgoto | BEhalt;
}
void
AsmStatement::toIR(IRState * irs)
{
Logger::println("AsmStatement::toIR(): %s", loc.toChars());
LOG_SCOPE;
// sanity check
assert(irs->func()->decl->inlineAsm);
// get asm block
IRAsmBlock* asmblock = irs->asmBlock;
assert(asmblock);
#ifndef DISABLE_DEBUG_INFO
// debug info
if (global.params.symdebug)
DtoDwarfStopPoint(loc.linnum);
#endif
if (! asmcode)
return;
static std::string i_cns = "i";
static std::string p_cns = "i";
static std::string m_cns = "*m";
static std::string mw_cns = "=*m";
static std::string mrw_cns = "+*m";
static std::string memory_name = "memory";
AsmCode * code = (AsmCode *) asmcode;
std::vector<LLValue*> input_values;
std::vector<std::string> input_constraints;
std::vector<LLValue*> output_values;
std::vector<std::string> output_constraints;
std::vector<std::string> clobbers;
// FIXME
//#define HOST_WIDE_INT long
//HOST_WIDE_INT var_frame_offset; // "frame_offset" is a macro
bool clobbers_mem = code->clobbersMemory;
int input_idx = 0;
int n_outputs = 0;
int arg_map[10];
assert(code->args.size() <= 10);
std::vector<AsmArg>::iterator arg = code->args.begin();
for (unsigned i = 0; i < code->args.size(); i++, ++arg) {
bool is_input = true;
LLValue* arg_val = 0;
std::string cns;
switch (arg->type) {
case Arg_Integer:
arg_val = arg->expr->toElem(irs)->getRVal();
do_integer:
cns = i_cns;
break;
case Arg_Pointer:
assert(arg->expr->op == TOKvar);
arg_val = arg->expr->toElem(irs)->getRVal();
cns = p_cns;
break;
case Arg_Memory:
arg_val = arg->expr->toElem(irs)->getRVal();
switch (arg->mode) {
case Mode_Input: cns = m_cns; break;
case Mode_Output: cns = mw_cns; is_input = false; break;
case Mode_Update: cns = mrw_cns; is_input = false; break;
default: assert(0); break;
}
break;
case Arg_FrameRelative:
// FIXME
assert(0 && "asm fixme Arg_FrameRelative");
/* if (arg->expr->op == TOKvar)
arg_val = ((VarExp *) arg->expr)->var->toSymbol()->Stree;
else
assert(0);
if ( getFrameRelativeValue(arg_val, & var_frame_offset) ) {
// arg_val = irs->integerConstant(var_frame_offset);
cns = i_cns;
} else {
this->error("%s", "argument not frame relative");
return;
}
if (arg->mode != Mode_Input)
clobbers_mem = true;
break;*/
case Arg_LocalSize:
// FIXME
assert(0 && "asm fixme Arg_LocalSize");
/* var_frame_offset = cfun->x_frame_offset;
if (var_frame_offset < 0)
var_frame_offset = - var_frame_offset;
arg_val = irs->integerConstant( var_frame_offset );*/
goto do_integer;
default:
assert(0);
}
if (is_input) {
arg_map[i] = --input_idx;
input_values.push_back(arg_val);
input_constraints.push_back(cns);
} else {
arg_map[i] = n_outputs++;
output_values.push_back(arg_val);
output_constraints.push_back(cns);
}
}
// Telling GCC that callee-saved registers are clobbered makes it preserve
// those registers. This changes the stack from what a naked function
// expects.
// FIXME
// if (! irs->func->naked) {
assert(asmparser);
for (int i = 0; i < code->regs.size(); i++) {
if (code->regs[i]) {
clobbers.push_back(asmparser->getRegName(i));
}
}
if (clobbers_mem)
clobbers.push_back(memory_name);
// }
// Remap argument numbers
for (unsigned i = 0; i < code->args.size(); i++) {
if (arg_map[i] < 0)
arg_map[i] = -arg_map[i] - 1 + n_outputs;
}
bool pct = false;
std::string::iterator
p = code->insnTemplate.begin(),
q = code->insnTemplate.end();
//printf("start: %.*s\n", code->insnTemplateLen, code->insnTemplate);
while (p < q) {
if (pct) {
if (*p >= '0' && *p <= '9') {
// %% doesn't check against nargs
*p = '0' + arg_map[*p - '0'];
pct = false;
} else if (*p == '$') {
pct = false;
}
//assert(*p == '%');// could be 'a', etc. so forget it..
} else if (*p == '$')
pct = true;
++p;
}
typedef std::vector<std::string>::iterator It;
if (Logger::enabled()) {
Logger::cout() << "final asm: " << code->insnTemplate << '\n';
std::ostringstream ss;
ss << "GCC-style output constraints: {";
for (It i = output_constraints.begin(), e = output_constraints.end(); i != e; ++i) {
ss << " " << *i;
}
ss << " }";
Logger::println("%s", ss.str().c_str());
ss.str("");
ss << "GCC-style input constraints: {";
for (It i = input_constraints.begin(), e = input_constraints.end(); i != e; ++i) {
ss << " " << *i;
}
ss << " }";
Logger::println("%s", ss.str().c_str());
ss.str("");
ss << "GCC-style clobbers: {";
for (It i = clobbers.begin(), e = clobbers.end(); i != e; ++i) {
ss << " " << *i;
}
ss << " }";
Logger::println("%s", ss.str().c_str());
}
// rewrite GCC-style constraints to LLVM-style constraints
std::string llvmOutConstraints;
std::string llvmInConstraints;
int n = 0;
for(It i = output_constraints.begin(), e = output_constraints.end(); i != e; ++i, ++n) {
// rewrite update constraint to in and out constraints
if((*i)[0] == '+') {
assert(*i == mrw_cns && "What else are we updating except memory?");
/* LLVM doesn't support updating operands, so split into an input
* and an output operand.
*/
// Change update operand to pure output operand.
*i = mw_cns;
// Add input operand with same value, with original as "matching output".
std::ostringstream ss;
ss << '*' << (n + asmblock->outputcount);
// Must be at the back; unused operands before used ones screw up numbering.
input_constraints.push_back(ss.str());
input_values.push_back(output_values[n]);
}
llvmOutConstraints += *i;
llvmOutConstraints += ",";
}
asmblock->outputcount += n;
for(It i = input_constraints.begin(), e = input_constraints.end(); i != e; ++i) {
llvmInConstraints += *i;
llvmInConstraints += ",";
}
std::string clobstr;
for(It i = clobbers.begin(), e = clobbers.end(); i != e; ++i) {
clobstr = "~{" + *i + "},";
asmblock->clobs.insert(clobstr);
}
if (Logger::enabled()) {
typedef std::vector<LLValue*>::iterator It;
{
Logger::println("Output values:");
LOG_SCOPE
size_t i = 0;
for (It I = output_values.begin(), E = output_values.end(); I != E; ++I) {
Logger::cout() << "Out " << i++ << " = " << **I << '\n';
}
}
{
Logger::println("Input values:");
LOG_SCOPE
size_t i = 0;
for (It I = input_values.begin(), E = input_values.end(); I != E; ++I) {
Logger::cout() << "In " << i++ << " = " << **I << '\n';
}
}
}
// excessive commas are removed later...
// push asm statement
IRAsmStmt* asmStmt = new IRAsmStmt;
asmStmt->code = code->insnTemplate;
asmStmt->out_c = llvmOutConstraints;
asmStmt->in_c = llvmInConstraints;
asmStmt->out.insert(asmStmt->out.begin(), output_values.begin(), output_values.end());
asmStmt->in.insert(asmStmt->in.begin(), input_values.begin(), input_values.end());
asmStmt->isBranchToLabel = isBranchToLabel;
asmblock->s.push_back(asmStmt);
}
//////////////////////////////////////////////////////////////////////////////
AsmBlockStatement::AsmBlockStatement(Loc loc, Statements* s)
: CompoundStatement(loc, s)
{
enclosingFinally = NULL;
enclosingScopeExit = NULL;
abiret = NULL;
}
// rewrite argument indices to the block scope indices
static void remap_outargs(std::string& insnt, size_t nargs, size_t idx)
{
static const std::string digits[10] =
{
"0","1","2","3","4",
"5","6","7","8","9"
};
assert(nargs <= 10);
static const std::string prefix("<<out");
static const std::string suffix(">>");
std::string argnum;
std::string needle;
char buf[10];
for (unsigned i = 0; i < nargs; i++) {
needle = prefix + digits[i] + suffix;
size_t pos = insnt.find(needle);
if(std::string::npos != pos)
sprintf(buf, "%lu", idx++);
while(std::string::npos != (pos = insnt.find(needle)))
insnt.replace(pos, needle.size(), buf);
}
}
// rewrite argument indices to the block scope indices
static void remap_inargs(std::string& insnt, size_t nargs, size_t idx)
{
static const std::string digits[10] =
{
"0","1","2","3","4",
"5","6","7","8","9"
};
assert(nargs <= 10);
static const std::string prefix("<<in");
static const std::string suffix(">>");
std::string argnum;
std::string needle;
char buf[10];
for (unsigned i = 0; i < nargs; i++) {
needle = prefix + digits[i] + suffix;
size_t pos = insnt.find(needle);
if(std::string::npos != pos)
sprintf(buf, "%lu", idx++);
while(std::string::npos != (pos = insnt.find(needle)))
insnt.replace(pos, needle.size(), buf);
}
}
LLValue* DtoAggrPairSwap(LLValue* aggr);
void AsmBlockStatement::toIR(IRState* p)
{
Logger::println("AsmBlockStatement::toIR(): %s", loc.toChars());
LOG_SCOPE;
Logger::println("BEGIN ASM");
// disable inlining by default
if (!p->func()->decl->allowInlining)
p->func()->setNeverInline();
// create asm block structure
assert(!p->asmBlock);
IRAsmBlock* asmblock = new IRAsmBlock(this);
assert(asmblock);
p->asmBlock = asmblock;
// do asm statements
for (int i=0; i<statements->dim; i++)
{
Statement* s = (Statement*)statements->data[i];
if (s) {
s->toIR(p);
}
}
// build forwarder for in-asm branches to external labels
// this additional asm code sets the __llvm_jump_target variable
// to a unique value that will identify the jump target in
// a post-asm switch
// maps each goto destination to its special value
std::map<Identifier*, int> gotoToVal;
// location of the special value determining the goto label
// will be set if post-asm dispatcher block is needed
llvm::AllocaInst* jump_target;
{
FuncDeclaration* fd = gIR->func()->decl;
char* fdmangle = fd->mangle();
// we use a simple static counter to make sure the new end labels are unique
static size_t uniqueLabelsId = 0;
std::ostringstream asmGotoEndLabel;
asmGotoEndLabel << "." << fdmangle << "__llvm_asm_end" << uniqueLabelsId++;
// initialize the setter statement we're going to build
IRAsmStmt* outSetterStmt = new IRAsmStmt;
std::string asmGotoEnd = "\n\tjmp "+asmGotoEndLabel.str()+"\n";
std::ostringstream code;
code << asmGotoEnd;
int n_goto = 1;
size_t n = asmblock->s.size();
for(size_t i=0; i<n; ++i)
{
IRAsmStmt* a = asmblock->s[i];
// skip non-branch statements
if(!a->isBranchToLabel)
continue;
// if internal, no special handling is necessary, skip
std::vector<Identifier*>::const_iterator it, end;
end = asmblock->internalLabels.end();
bool skip = false;
for(it = asmblock->internalLabels.begin(); it != end; ++it)
if((*it)->equals(a->isBranchToLabel))
skip = true;
if(skip)
continue;
// if we already set things up for this branch target, skip
if(gotoToVal.find(a->isBranchToLabel) != gotoToVal.end())
continue;
// record that the jump needs to be handled in the post-asm dispatcher
gotoToVal[a->isBranchToLabel] = n_goto;
// provide an in-asm target for the branch and set value
Logger::println("statement '%s' references outer label '%s': creating forwarder", a->code.c_str(), a->isBranchToLabel->string);
code << fdmangle << '_' << a->isBranchToLabel->string << ":\n\t";
code << "movl $<<in" << n_goto << ">>, $<<out0>>\n";
//FIXME: Store the value -> label mapping somewhere, so it can be referenced later
outSetterStmt->in.push_back(DtoConstUint(n_goto));
outSetterStmt->in_c += "i,";
code << asmGotoEnd;
++n_goto;
}
if(code.str() != asmGotoEnd)
{
// finalize code
outSetterStmt->code = code.str();
outSetterStmt->code += asmGotoEndLabel.str()+":\n";
// create storage for and initialize the temporary
jump_target = DtoAlloca(Type::tint32, "__llvm_jump_target");
gIR->ir->CreateStore(DtoConstUint(0), jump_target);
// setup variable for output from asm
outSetterStmt->out_c = "=*m,";
outSetterStmt->out.push_back(jump_target);
asmblock->s.push_back(outSetterStmt);
}
else
delete outSetterStmt;
}
// build a fall-off-end-properly asm statement
FuncDeclaration* thisfunc = p->func()->decl;
bool useabiret = false;
p->asmBlock->asmBlock->abiret = NULL;
if (thisfunc->fbody->endsWithAsm() == this && thisfunc->type->nextOf()->ty != Tvoid)
{
// there can't be goto forwarders in this case
assert(gotoToVal.empty());
emitABIReturnAsmStmt(asmblock, loc, thisfunc);
useabiret = true;
}
// build asm block
std::vector<LLValue*> outargs;
std::vector<LLValue*> inargs;
std::vector<const LLType*> outtypes;
std::vector<const LLType*> intypes;
std::string out_c;
std::string in_c;
std::string clobbers;
std::string code;
size_t asmIdx = asmblock->retn;
Logger::println("do outputs");
size_t n = asmblock->s.size();
for (size_t i=0; i<n; ++i)
{
IRAsmStmt* a = asmblock->s[i];
assert(a);
size_t onn = a->out.size();
for (size_t j=0; j<onn; ++j)
{
outargs.push_back(a->out[j]);
outtypes.push_back(a->out[j]->getType());
}
if (!a->out_c.empty())
{
out_c += a->out_c;
}
remap_outargs(a->code, onn+a->in.size(), asmIdx);
asmIdx += onn;
}
Logger::println("do inputs");
for (size_t i=0; i<n; ++i)
{
IRAsmStmt* a = asmblock->s[i];
assert(a);
size_t inn = a->in.size();
for (size_t j=0; j<inn; ++j)
{
inargs.push_back(a->in[j]);
intypes.push_back(a->in[j]->getType());
}
if (!a->in_c.empty())
{
in_c += a->in_c;
}
remap_inargs(a->code, inn+a->out.size(), asmIdx);
asmIdx += inn;
if (!code.empty())
code += "\n\t";
code += a->code;
}
asmblock->s.clear();
// append inputs
out_c += in_c;
// append clobbers
typedef std::set<std::string>::iterator clobs_it;
for (clobs_it i=asmblock->clobs.begin(); i!=asmblock->clobs.end(); ++i)
{
out_c += *i;
}
// remove excessive comma
if (!out_c.empty())
out_c.resize(out_c.size()-1);
Logger::println("code = \"%s\"", code.c_str());
Logger::println("constraints = \"%s\"", out_c.c_str());
// build return types
const LLType* retty;
if (asmblock->retn)
retty = asmblock->retty;
else
retty = llvm::Type::getVoidTy(gIR->context());
// build argument types
std::vector<const LLType*> types;
types.insert(types.end(), outtypes.begin(), outtypes.end());
types.insert(types.end(), intypes.begin(), intypes.end());
llvm::FunctionType* fty = llvm::FunctionType::get(retty, types, false);
if (Logger::enabled())
Logger::cout() << "function type = " << *fty << '\n';
std::vector<LLValue*> args;
args.insert(args.end(), outargs.begin(), outargs.end());
args.insert(args.end(), inargs.begin(), inargs.end());
if (Logger::enabled()) {
Logger::cout() << "Arguments:" << '\n';
Logger::indent();
for (std::vector<LLValue*>::iterator b = args.begin(), i = b, e = args.end(); i != e; ++i) {
Stream cout = Logger::cout();
cout << '$' << (i - b) << " ==> " << **i;
if (!llvm::isa<llvm::Instruction>(*i) && !llvm::isa<LLGlobalValue>(*i))
cout << '\n';
}
Logger::undent();
}
llvm::InlineAsm* ia = llvm::InlineAsm::get(fty, code, out_c, true);
llvm::CallInst* call = p->ir->CreateCall(ia, args.begin(), args.end(),
retty == LLType::getVoidTy(gIR->context()) ? "" : "asm");
if (Logger::enabled())
Logger::cout() << "Complete asm statement: " << *call << '\n';
// capture abi return value
if (useabiret)
{
IRAsmBlock* block = p->asmBlock;
if (block->retfixup)
block->asmBlock->abiret = (*block->retfixup)(p->ir, call);
else if (p->asmBlock->retemu)
block->asmBlock->abiret = DtoLoad(block->asmBlock->abiret);
else
block->asmBlock->abiret = call;
}
p->asmBlock = NULL;
Logger::println("END ASM");
// if asm contained external branches, emit goto forwarder code
if(!gotoToVal.empty())
{
assert(jump_target);
// make new blocks
llvm::BasicBlock* oldend = gIR->scopeend();
llvm::BasicBlock* bb = llvm::BasicBlock::Create(gIR->context(), "afterasmgotoforwarder", p->topfunc(), oldend);
llvm::LoadInst* val = p->ir->CreateLoad(jump_target, "__llvm_jump_target_value");
llvm::SwitchInst* sw = p->ir->CreateSwitch(val, bb, gotoToVal.size());
// add all cases
std::map<Identifier*, int>::iterator it, end = gotoToVal.end();
for(it = gotoToVal.begin(); it != end; ++it)
{
llvm::BasicBlock* casebb = llvm::BasicBlock::Create(gIR->context(), "case", p->topfunc(), bb);
sw->addCase(LLConstantInt::get(llvm::IntegerType::get(gIR->context(), 32), it->second), casebb);
p->scope() = IRScope(casebb,bb);
DtoGoto(loc, it->first, enclosingFinally);
}
p->scope() = IRScope(bb,oldend);
}
}
// the whole idea of this statement is to avoid the flattening
Statements* AsmBlockStatement::flatten(Scope* sc)
{
return NULL;
}
Statement *AsmBlockStatement::syntaxCopy()
{
Statements *a = new Statements();
a->setDim(statements->dim);
for (size_t i = 0; i < statements->dim; i++)
{
Statement *s = (Statement *)statements->data[i];
if (s)
s = s->syntaxCopy();
a->data[i] = s;
}
AsmBlockStatement *cs = new AsmBlockStatement(loc, a);
return cs;
}
// necessary for in-asm branches
Statement *AsmBlockStatement::semantic(Scope *sc)
{
enclosingFinally = sc->enclosingFinally;
enclosingScopeExit = sc->enclosingScopeExit;
return CompoundStatement::semantic(sc);
}
//////////////////////////////////////////////////////////////////////////////
void AsmStatement::toNakedIR(IRState *p)
{
Logger::println("AsmStatement::toNakedIR(): %s", loc.toChars());
LOG_SCOPE;
// is there code?
if (!asmcode)
return;
AsmCode * code = (AsmCode *) asmcode;
// build asm stmt
p->nakedAsm << "\t" << code->insnTemplate << std::endl;
}
void AsmBlockStatement::toNakedIR(IRState *p)
{
Logger::println("AsmBlockStatement::toNakedIR(): %s", loc.toChars());
LOG_SCOPE;
// do asm statements
for (unsigned i=0; i<statements->dim; i++)
{
Statement* s = (Statement*)statements->data[i];
if (s) s->toNakedIR(p);
}
}
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