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Debug info: for extern(D) functions whose order of explicit arguments gets reversed, set the calling convention to DW_CC_D_dmd.

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DW_CC_D_dmd is set to the first available value according to https://gcc.gnu.org/wiki/GNUDwarfExtensions. A GDB patch to handle this calling convention is being proposed.
This commit is contained in:
Elie Morisse 2018-08-25 15:39:56 -03:00 • committed by Martin Kinkelin
parent c4114da5da
commit dcad25d6fd
1 changed files with 10 additions and 1 deletions
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11
gen/dibuilder.cpp
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@ -19,6 +19,7 @@
#include "gen/optimizer.h"
#include "ir/irfunction.h"
#include "ir/irmodule.h"
#include "ir/irfuncty.h"
#include "ir/irtypeaggr.h"
#include "llvm/ADT/SmallString.h"
#include "llvm/Support/FileSystem.h"
@ -660,6 +661,8 @@ ldc::DIType ldc::DIBuilder::CreateAArrayType(Type *type) {
////////////////////////////////////////////////////////////////////////////////
const unsigned DW_CC_D_dmd = 0x43; // new calling convention constant being proposed as a Dwarf extension
ldc::DISubroutineType ldc::DIBuilder::CreateFunctionType(Type *type) {
assert(type->toBasetype()->ty == Tfunction);
@ -670,7 +673,13 @@ ldc::DISubroutineType ldc::DIBuilder::CreateFunctionType(Type *type) {
LLMetadata *params = {CreateTypeDescription(retType)};
auto paramsArray = DBuilder.getOrCreateTypeArray(params);
return DBuilder.createSubroutineType(paramsArray);
// The calling convention has to be recorded to distinguish
// extern(D) functions from extern(C++) ones.
DtoType(t);
assert(t->ctype);
unsigned CC = t->ctype->getIrFuncTy().reverseParams ? DW_CC_D_dmd : 0;
return DBuilder.createSubroutineType(paramsArray, DIFlagZero, CC);
}
ldc::DISubroutineType ldc::DIBuilder::CreateEmptyFunctionType() {