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dwarf_extractor.cpp: Enable limited support for C++ (bytecodealliance…
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…#3540)

While band-aid fixes like this is not plausible IMO,
some people prefer to have some debug info even if it's
partial/limited/broken. This commit partially (re)enables
C++ processing. On the other hand, do not bother to process
variables because it's known incompatible with C++.
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@yamt
yamt authored Jun 18, 2024
1 parent fa8a80a commit 72f74b7
Showing 1 changed file with 67 additions and 50 deletions.
117 changes: 67 additions & 50 deletions core/iwasm/compilation/debug/dwarf_extractor.cpp
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Original file line number Diff line number Diff line change
Expand Up @@ -305,13 +305,22 @@ lldb_function_to_function_dbi(const AOTCompContext *comp_ctx,
* https://github.com/bytecodealliance/wasm-micro-runtime/issues/3163
*/
LanguageType language_type = function.GetLanguage();
bool cplusplus = false;
switch (language_type) {
case eLanguageTypeC89:
case eLanguageTypeC:
case eLanguageTypeC99:
case eLanguageTypeC11:
case eLanguageTypeC17:
break;
case eLanguageTypeC_plus_plus:
case eLanguageTypeC_plus_plus_03:
case eLanguageTypeC_plus_plus_11:
case eLanguageTypeC_plus_plus_14:
case eLanguageTypeC_plus_plus_17:
case eLanguageTypeC_plus_plus_20:
cplusplus = true;
break;
default:
LOG_WARNING("func %s has unsupported language_type 0x%x",
function_name, (int)language_type);
Expand All @@ -325,28 +334,32 @@ lldb_function_to_function_dbi(const AOTCompContext *comp_ctx,
LLVMMetadataRef File = comp_ctx->debug_file; /* a fallback */

LLVMMetadataRef ParamTypes[num_function_args + 1];

ParamTypes[0] = lldb_type_to_type_dbi(comp_ctx, return_type);

for (uint32_t function_arg_idx = 0; function_arg_idx < num_function_args;
++function_arg_idx) {
SBType function_arg_type =
function_args.GetTypeAtIndex(function_arg_idx);

if (function_arg_type.IsValid()) {
ParamTypes[function_arg_idx + 1] =
lldb_type_to_type_dbi(comp_ctx, function_arg_type);
if (ParamTypes[function_arg_idx + 1] == NULL) {
LOG_WARNING(
"func %s arg %" PRIu32
" has a type not implemented by lldb_type_to_type_dbi",
function_name, function_arg_idx);
}
}
else {
LOG_WARNING("func %s arg %" PRIu32 ": GetTypeAtIndex failed",
size_t num_param_types = 0;

if (!cplusplus) {
num_param_types = num_function_args + 1;
ParamTypes[0] = lldb_type_to_type_dbi(comp_ctx, return_type);

for (uint32_t function_arg_idx = 0;
function_arg_idx < num_function_args; ++function_arg_idx) {
SBType function_arg_type =
function_args.GetTypeAtIndex(function_arg_idx);

if (function_arg_type.IsValid()) {
ParamTypes[function_arg_idx + 1] =
lldb_type_to_type_dbi(comp_ctx, function_arg_type);
if (ParamTypes[function_arg_idx + 1] == NULL) {
LOG_WARNING(
"func %s arg %" PRIu32
" has a type not implemented by lldb_type_to_type_dbi",
function_name, function_arg_idx);
ParamTypes[function_arg_idx + 1] = NULL;
}
}
else {
LOG_WARNING("func %s arg %" PRIu32 ": GetTypeAtIndex failed",
function_name, function_arg_idx);
ParamTypes[function_arg_idx + 1] = NULL;
}
}
}

Expand All @@ -366,7 +379,7 @@ lldb_function_to_function_dbi(const AOTCompContext *comp_ctx,
}

LLVMMetadataRef FunctionTy = LLVMDIBuilderCreateSubroutineType(
DIB, File, ParamTypes, num_function_args + 1, LLVMDIFlagZero);
DIB, File, ParamTypes, num_param_types, LLVMDIFlagZero);

auto line_entry = sc.GetLineEntry();
LLVMMetadataRef ReplaceableFunctionMetadata =
Expand All @@ -386,13 +399,6 @@ lldb_function_to_function_dbi(const AOTCompContext *comp_ctx,

LLVMMetadataRef ParamExpression =
LLVMDIBuilderCreateExpression(DIB, NULL, 0);
auto variable_list =
function.GetBlock().GetVariables(extractor->target, true, false, false);
if (num_function_args != variable_list.GetSize()) {
LOG_ERROR(
"function args number mismatch!:value number=%d, function args=%d",
variable_list.GetSize(), num_function_args);
}

LLVMMetadataRef ParamLocation = LLVMDIBuilderCreateDebugLocation(
comp_ctx->context, line_entry.GetLine(), 0, FunctionMetadata, NULL);
Expand All @@ -412,27 +418,38 @@ lldb_function_to_function_dbi(const AOTCompContext *comp_ctx,
LLVMDIBuilderInsertDbgValueAtEnd(DIB, Param, ParamVar, ParamExpression,
ParamLocation, block_curr);

for (uint32_t function_arg_idx = 0;
function_arg_idx < variable_list.GetSize(); ++function_arg_idx) {
SBValue variable(variable_list.GetValueAtIndex(function_arg_idx));
if (variable.IsValid() && ParamTypes[function_arg_idx + 1] != NULL) {
SBDeclaration dec(variable.GetDeclaration());
auto valtype = variable.GetType();
LLVMMetadataRef ParamLocation = LLVMDIBuilderCreateDebugLocation(
comp_ctx->context, dec.GetLine(), dec.GetColumn(),
FunctionMetadata, NULL);
const char *varname = variable.GetName();
LLVMMetadataRef ParamVar = LLVMDIBuilderCreateParameterVariable(
DIB, FunctionMetadata, varname, varname ? strlen(varname) : 0,
function_arg_idx + 1 + 1,
File, // starts form 1, and 1 is exenv,
dec.GetLine(), ParamTypes[function_arg_idx + 1], true,
LLVMDIFlagZero);
LLVMValueRef Param =
LLVMGetParam(func_ctx->func, function_arg_idx + 1);
LLVMDIBuilderInsertDbgValueAtEnd(DIB, Param, ParamVar,
ParamExpression, ParamLocation,
block_curr);
if (!cplusplus) {
auto variable_list = function.GetBlock().GetVariables(
extractor->target, true, false, false);
if (num_function_args != variable_list.GetSize()) {
LOG_ERROR("function args number mismatch!:value number=%d, "
"function args=%d",
variable_list.GetSize(), num_function_args);
}
for (uint32_t function_arg_idx = 0;
function_arg_idx < variable_list.GetSize(); ++function_arg_idx) {
SBValue variable(variable_list.GetValueAtIndex(function_arg_idx));
if (variable.IsValid()
&& ParamTypes[function_arg_idx + 1] != NULL) {
SBDeclaration dec(variable.GetDeclaration());
auto valtype = variable.GetType();
LLVMMetadataRef ParamLocation =
LLVMDIBuilderCreateDebugLocation(
comp_ctx->context, dec.GetLine(), dec.GetColumn(),
FunctionMetadata, NULL);
const char *varname = variable.GetName();
LLVMMetadataRef ParamVar = LLVMDIBuilderCreateParameterVariable(
DIB, FunctionMetadata, varname,
varname ? strlen(varname) : 0, function_arg_idx + 1 + 1,
File, // starts form 1, and 1 is exenv,
dec.GetLine(), ParamTypes[function_arg_idx + 1], true,
LLVMDIFlagZero);
LLVMValueRef Param =
LLVMGetParam(func_ctx->func, function_arg_idx + 1);
LLVMDIBuilderInsertDbgValueAtEnd(DIB, Param, ParamVar,
ParamExpression, ParamLocation,
block_curr);
}
}
}

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