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Archibald Rust and Clifford Wolf: ffi-based dpi_call()

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This commit is contained in:
Clifford Wolf 2014-08-22 14:22:09 +02:00
parent a3494fa9ed
commit 74af3a2b70
3 changed files with 93 additions and 9 deletions
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96
frontends/ast/dpicall.cc
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@ -17,26 +17,110 @@
*
*/
#include <dlfcn.h>
#include <ffi.h>
#include "ast.h"
typedef void (*ffi_fptr) ();
static ffi_fptr resolve_fn (std::string symbol_name)
{
if (symbol_name.find(':') != std::string::npos)
{
int pos = symbol_name.find(':');
std::string plugin_name = symbol_name.substr(0, pos);
std::string real_symbol_name = symbol_name.substr(pos+1);
while (loaded_plugin_aliases.count(plugin_name))
plugin_name = loaded_plugin_aliases.at(plugin_name);
if (loaded_plugins.count(plugin_name) == 0)
log_error("unable to resolve '%s': can't find plugin `%s'\n", symbol_name.c_str(), plugin_name.c_str());
void *symbol = dlsym(loaded_plugins.at(plugin_name), real_symbol_name.c_str());
if (symbol == nullptr)
log_error("unable to resolve '%s': can't find symbol `%s' in plugin `%s'\n",
symbol_name.c_str(), real_symbol_name.c_str(), plugin_name.c_str());
return (ffi_fptr) symbol;
}
for (auto &it : loaded_plugins) {
void *symbol = dlsym(it.second, symbol_name.c_str());
if (symbol != nullptr)
return (ffi_fptr) symbol;
}
void *symbol = dlsym(RTLD_DEFAULT, symbol_name.c_str());
if (symbol != nullptr)
return (ffi_fptr) symbol;
log_error("unable to resolve '%s'.\n", symbol_name.c_str());
}
AST::AstNode *AST::dpi_call(const std::string &rtype, const std::string &fname, const std::vector<std::string> &argtypes, const std::vector<AstNode*> &args)
{
AST::AstNode *newNode = nullptr;
union { double f64; float f32; int32_t i32; } value_store [args.size() + 1];
ffi_type *types [args.size() + 1];
void *values [args.size() + 1];
ffi_cif cif;
int status;
log("Calling DPI function `%s' and returning `%s':\n", fname.c_str(), rtype.c_str());
log_assert(SIZE(args) == SIZE(argtypes));
for (int i = 0; i < SIZE(args); i++)
if (argtypes[i] == "real" || argtypes[i] == "shortreal")
for (int i = 0; i < SIZE(args); i++) {
if (argtypes[i] == "real") {
log(" arg %d (%s): %f\n", i, argtypes[i].c_str(), args[i]->asReal(args[i]->is_signed));
else
value_store[i].f64 = args[i]->asReal(args[i]->is_signed);
values[i] = &value_store[i].f64;
types[i] = &ffi_type_double;
} else if (argtypes[i] == "shortreal") {
log(" arg %d (%s): %f\n", i, argtypes[i].c_str(), args[i]->asReal(args[i]->is_signed));
value_store[i].f32 = args[i]->asReal(args[i]->is_signed);
values[i] = &value_store[i].f32;
types[i] = &ffi_type_double;
} else if (argtypes[i] == "integer") {
log(" arg %d (%s): %lld\n", i, argtypes[i].c_str(), (long long)args[i]->asInt(args[i]->is_signed));
value_store[i].i32 = args[i]->asInt(args[i]->is_signed);
values[i] = &value_store[i].i32;
types[i] = &ffi_type_sint32;
} else {
log_error("invalid argtype '%s' for argument %d.\n", argtypes[i].c_str(), i);
}
}
if (rtype == "real" || rtype == "shortreal") {
if (rtype == "integer") {
types[args.size()] = &ffi_type_slong;
values[args.size()] = &value_store[args.size()].i32;
} else if (rtype == "shortreal") {
types[args.size()] = &ffi_type_float;
values[args.size()] = &value_store[args.size()].f32;
} else if (rtype == "real") {
types[args.size()] = &ffi_type_double;
values[args.size()] = &value_store[args.size()].f64;
} else {
log_error("invalid rtype '%s'.\n", rtype.c_str());
}
if ((status = ffi_prep_cif(&cif, FFI_DEFAULT_ABI, args.size(), types[args.size()], types)) != FFI_OK)
log_error("ffi_prep_cif failed: status %d.\n", status);
ffi_call(&cif, resolve_fn(fname.c_str()), values[args.size()], values);
if (rtype == "real") {
newNode = new AstNode(AST_REALVALUE);
newNode->realvalue = 1234;
newNode->realvalue = value_store[args.size()].f64;
log(" return realvalue: %g\n", newNode->asReal(true));
} else if (rtype == "shortreal") {
newNode = new AstNode(AST_REALVALUE);
newNode->realvalue = value_store[args.size()].f32;
log(" return realvalue: %g\n", newNode->asReal(true));
} else {
newNode = AstNode::mkconst_int(1234, false);
newNode = AstNode::mkconst_int(value_store[args.size()].i32, false);
log(" return integer: %lld\n", (long long)newNode->asInt(true));
}
return newNode;