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stage2: add debug info for globals in the LLVM backend

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LLVM backend: generate DIGlobalVariable's for non-function globals and
rename linkage names when exporting functions and globals.

zig_llvm.cpp: add some wrappers to convert a handful of DI classes
into DINode's since DIGlobalVariable is not a DIScope like the others.

zig_llvm.cpp: add some wrappers to allow replacing the LinkageName of
DISubprogram and DIGlobalVariable.

zig_llvm.cpp: fix DI class mixup causing nonsense reinterpret_cast.

The end result is that GDB is now usable since you now no longer need
to manually cast every global nor fully qualify every export.
This commit is contained in:
William Sengir
2022-03-13 00:28:34 -07:00
committed by Andrew Kelley
parent f36bf8506c
commit c757f19790
5 changed files with 150 additions and 8 deletions
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52
src/zig_llvm.cpp
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@@ -842,7 +842,7 @@ ZigLLVMDIGlobalVariable *ZigLLVMCreateGlobalVariable(ZigLLVMDIBuilder *dbuilder,
line_no,
reinterpret_cast<DIType*>(di_type),
is_local_to_unit);
return reinterpret_cast<ZigLLVMDIGlobalVariable*>(result);
return reinterpret_cast<ZigLLVMDIGlobalVariable*>(result->getVariable());
}
ZigLLVMDILocalVariable *ZigLLVMCreateParameterVariable(ZigLLVMDIBuilder *dbuilder,
@@ -887,6 +887,56 @@ ZigLLVMDIScope *ZigLLVMTypeToScope(ZigLLVMDIType *type) {
return reinterpret_cast<ZigLLVMDIScope*>(scope);
}
ZigLLVMDINode *ZigLLVMLexicalBlockToNode(ZigLLVMDILexicalBlock *lexical_block) {
DINode *node = reinterpret_cast<DILexicalBlock*>(lexical_block);
return reinterpret_cast<ZigLLVMDINode*>(node);
}
ZigLLVMDINode *ZigLLVMCompileUnitToNode(ZigLLVMDICompileUnit *compile_unit) {
DINode *node = reinterpret_cast<DICompileUnit*>(compile_unit);
return reinterpret_cast<ZigLLVMDINode*>(node);
}
ZigLLVMDINode *ZigLLVMFileToNode(ZigLLVMDIFile *difile) {
DINode *node = reinterpret_cast<DIFile*>(difile);
return reinterpret_cast<ZigLLVMDINode*>(node);
}
ZigLLVMDINode *ZigLLVMSubprogramToNode(ZigLLVMDISubprogram *subprogram) {
DINode *node = reinterpret_cast<DISubprogram*>(subprogram);
return reinterpret_cast<ZigLLVMDINode*>(node);
}
ZigLLVMDINode *ZigLLVMTypeToNode(ZigLLVMDIType *type) {
DINode *node = reinterpret_cast<DIType*>(type);
return reinterpret_cast<ZigLLVMDINode*>(node);
}
ZigLLVMDINode *ZigLLVMScopeToNode(ZigLLVMDIScope *scope) {
DINode *node = reinterpret_cast<DIScope*>(scope);
return reinterpret_cast<ZigLLVMDINode*>(node);
}
ZigLLVMDINode *ZigLLVMGlobalVariableToNode(ZigLLVMDIGlobalVariable *global_variable) {
DINode *node = reinterpret_cast<DIGlobalVariable*>(global_variable);
return reinterpret_cast<ZigLLVMDINode*>(node);
}
void ZigLLVMSubprogramReplaceLinkageName(ZigLLVMDISubprogram *subprogram,
ZigLLVMMDString *linkage_name)
{
MDString *linkage_name_md = reinterpret_cast<MDString*>(linkage_name);
reinterpret_cast<DISubprogram*>(subprogram)->replaceLinkageName(linkage_name_md);
}
void ZigLLVMGlobalVariableReplaceLinkageName(ZigLLVMDIGlobalVariable *global_variable,
ZigLLVMMDString *linkage_name)
{
Metadata *linkage_name_md = reinterpret_cast<MDString*>(linkage_name);
// NOTE: Operand index must match llvm::DIGlobalVariable
reinterpret_cast<DIGlobalVariable*>(global_variable)->replaceOperandWith(5, linkage_name_md);
}
ZigLLVMDICompileUnit *ZigLLVMCreateCompileUnit(ZigLLVMDIBuilder *dibuilder,
unsigned lang, ZigLLVMDIFile *difile, const char *producer,
bool is_optimized, const char *flags, unsigned runtime_version, const char *split_name,