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ldc/gen/asmstmt.cpp
Christian Kamm b064c794de [svn r325] Removed dead code. 
Added license info to code from GDC (David Friedman permitted us to use the files under the Artistic License).
Added asmLabel check to DtoGoto to avoid jumping into inline asm. Doesn't work currently as LabelDsymbol::asmLabel is never set to true.
2008-06-25 23:42:38 +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 "dmd/statement.h"
#include "dmd/scope.h"
#include "dmd/declaration.h"
#include "dmd/dsymbol.h"
#include <cassert>
#include <deque>
#include <iostream>
#include <sstream>
#include <cstring>
//#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"
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 {
AsmArgType type;
Expression * expr;
AsmArgMode mode;
AsmArg(AsmArgType type, Expression * expr, AsmArgMode mode) {
this->type = type;
this->expr = expr;
this->mode = mode;
}
};
struct AsmCode {
char * insnTemplate;
unsigned insnTemplateLen;
Array args; // of AsmArg
unsigned moreRegs;
unsigned dollarLabel;
int clobbersMemory;
AsmCode() {
insnTemplate = NULL;
insnTemplateLen = 0;
moreRegs = 0;
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;
regs = 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;
a_s->regs = a_s->regs;
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;
}
#include "d-asm-i386.h"
bool d_have_inline_asm() { return true; }
Statement *AsmStatement::semantic(Scope *sc)
{
bool err = false;
if (global.params.cpu != ARCHx86)
{
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();
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;
AsmProcessor ap(sc, this);
ap.run();
return this;
}
void
AsmStatement::toIR(IRState * irs)
{
Logger::println("AsmStatement::toIR(): %s", loc.toChars());
LOG_SCOPE;
// get asm block
IRAsmBlock* asmblock = irs->asmBlock;
assert(asmblock);
// debug info
if (global.params.symdebug)
DtoDwarfStopPoint(loc.linnum);
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::deque<LLValue*> input_values;
std::deque<std::string> input_constraints;
std::deque<LLValue*> output_values;
std::deque<std::string> output_constraints;
std::deque<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.dim <= 10);
for (unsigned i = 0; i < code->args.dim; i++) {
AsmArg * arg = (AsmArg *) code->args.data[i];
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
std::cout << "asm fixme Arg_FrameRelative" << std::endl;
assert(0);
/* 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
std::cout << "asm fixme Arg_LocalSize" << std::endl;
assert(0);
/* 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;
//inputs.cons(tree_cons(NULL_TREE, cns, NULL_TREE), arg_val);
input_values.push_back(arg_val);
input_constraints.push_back(cns);
} else {
arg_map[i] = n_outputs++;
//outputs.cons(tree_cons(NULL_TREE, cns, NULL_TREE), arg_val);
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) {
for (int i = 0; i < 32; i++) {
if (regs & (1 << i)) {
//clobbers.cons(NULL_TREE, regInfo[i].gccName);
clobbers.push_back(regInfo[i].gccName);
}
}
for (int i = 0; i < 32; i++) {
if (code->moreRegs & (1 << (i-32))) {
//clobbers.cons(NULL_TREE, regInfo[i].gccName);
clobbers.push_back(regInfo[i].gccName);
}
}
if (clobbers_mem)
clobbers.push_back(memory_name);
//clobbers.cons(NULL_TREE, memory_name);
// }
// Remap argument numbers
for (unsigned i = 0; i < code->args.dim; i++) {
if (arg_map[i] < 0)
arg_map[i] = -arg_map[i] - 1 + n_outputs;
}
bool pct = false;
char * p = code->insnTemplate;
char * q = p + code->insnTemplateLen;
//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;
}
Logger::println("final asm: %.*s", code->insnTemplateLen, code->insnTemplate);
std::string insnt(code->insnTemplate, code->insnTemplateLen);
// rewrite GCC-style constraints to LLVM-style constraints
std::string llvmOutConstraints;
std::string llvmInConstraints;
int n = 0;
typedef std::deque<std::string>::iterator it;
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] == '+') {
(*i)[0] = '=';
std::string input_constraint;
std::stringstream ss;
ss << n;
ss >> input_constraint;
//FIXME: I think multiple inout constraints will mess up the order!
input_constraints.push_front(input_constraint);
input_values.push_front(output_values[n]);
}
llvmOutConstraints += *i;
llvmOutConstraints += ",";
}
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);
}
// excessive commas are removed later...
// push asm statement
IRAsmStmt* asmStmt = new IRAsmStmt;
asmStmt->code = insnt;
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)
{
enclosingtryfinally = 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, "%u", 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, "%u", idx++);
while(std::string::npos != (pos = insnt.find(needle)))
insnt.replace(pos, needle.size(), buf);
}
}
void AsmBlockStatement::toIR(IRState* p)
{
Logger::println("AsmBlockStatement::toIR(): %s", loc.toChars());
LOG_SCOPE;
Logger::println("BEGIN ASM");
// create asm block structure
assert(!p->asmBlock);
IRAsmBlock* asmblock = new IRAsmBlock;
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 special value to a goto destination
std::map<int, LabelDsymbol*> valToGoto;
// location of the value containing the index into the valToGoto map
// will be set if post-asm dispatcher block is needed
llvm::AllocaInst* jump_target;
{
// initialize the setter statement we're going to build
IRAsmStmt* outSetterStmt = new IRAsmStmt;
std::string asmGotoEnd = "jmp __llvm_asm_end ; ";
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->ident))
skip = true;
if(skip)
continue;
// record that the jump needs to be handled in the post-asm dispatcher
valToGoto[n_goto] = a->isBranchToLabel;
// 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->ident->string);
code << a->isBranchToLabel->ident->string << ": ; ";
code << "movl $<<in" << n_goto << ">>, $<<out0>> ; ";
//FIXME: Store the value -> label mapping somewhere, so it can be referenced later
outSetterStmt->in.push_back(llvm::ConstantInt::get(llvm::IntegerType::get(32), n_goto));
outSetterStmt->in_c += "i,";
code << asmGotoEnd;
++n_goto;
}
if(code.str() != asmGotoEnd)
{
// finalize code
outSetterStmt->code = code.str();
outSetterStmt->code += "__llvm_asm_end: ; ";
// create storage for and initialize the temporary
jump_target = new llvm::AllocaInst(llvm::IntegerType::get(32), "__llvm_jump_target", p->topallocapoint());
gIR->ir->CreateStore(llvm::ConstantInt::get(llvm::IntegerType::get(32), 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 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 = 0;
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);
}
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);
if (!code.empty())
code += " ; ";
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());
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(llvm::Type::VoidTy, types, false);
Logger::cout() << "function type = " << *fty << '\n';
llvm::InlineAsm* ia = llvm::InlineAsm::get(fty, code, out_c, true);
std::vector<LLValue*> args;
args.insert(args.end(), outargs.begin(), outargs.end());
args.insert(args.end(), inargs.begin(), inargs.end());
llvm::CallInst* call = p->ir->CreateCall(ia, args.begin(), args.end(), "");
p->asmBlock = NULL;
Logger::println("END ASM");
// if asm contained external branches, emit goto forwarder code
if(!valToGoto.empty())
{
assert(jump_target);
// make new blocks
llvm::BasicBlock* oldend = gIR->scopeend();
llvm::BasicBlock* bb = llvm::BasicBlock::Create("afterasmgotoforwarder", p->topfunc(), oldend);
llvm::LoadInst* val = p->ir->CreateLoad(jump_target, "__llvm_jump_target_value");
llvm::SwitchInst* sw = p->ir->CreateSwitch(val, bb, valToGoto.size());
// add all cases
std::map<int, LabelDsymbol*>::iterator it, end = valToGoto.end();
for(it = valToGoto.begin(); it != end; ++it)
{
llvm::BasicBlock* casebb = llvm::BasicBlock::Create("case", p->topfunc(), bb);
sw->addCase(llvm::ConstantInt::get(llvm::IntegerType::get(32), it->first), casebb);
p->scope() = IRScope(casebb,bb);
DtoGoto(&loc, it->second, enclosingtryfinally);
}
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)
{
enclosingtryfinally = sc->tfOfTry;
return CompoundStatement::semantic(sc);
}
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