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lldb_function_to_function_dbi: A hack to avoid crashing on C++ methods (#3190)

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Also, print the function name on argument mismatch.
This commit is contained in:
YAMAMOTO Takashi 2024-03-04 18:08:11 +09:00 committed by GitHub
parent 01575fc6da
commit 0e8d949440
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1 changed files with 26 additions and 9 deletions
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35
core/iwasm/compilation/debug/dwarf_extractor.cpp
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@ -354,10 +354,27 @@ lldb_function_to_function_dbi(const AOTCompContext *comp_ctx,
LLVMDIBuilderCreateExpression(DIB, NULL, 0);
auto variable_list =
function.GetBlock().GetVariables(extractor->target, true, false, false);
unsigned int variable_offset = 0;
if (num_function_args != variable_list.GetSize()) {
LOG_ERROR(
"function args number dismatch!:value number=%d, function args=%d",
variable_list.GetSize(), num_function_args);
// A hack to detect C++ "this" pointer.
//
// REVISIT: is there a more reliable way?
// At the DWARF level, we can probably look at DW_AT_object_pointer
// and DW_AT_artificial. I'm not sure how it can be done via the
// LLDB API though.
if (num_function_args + 1 == variable_list.GetSize()) {
SBValue variable(variable_list.GetValueAtIndex(0));
const char *varname = variable.GetName();
if (varname != NULL && !strcmp(varname, "this")) {
variable_offset = 1;
}
}
if (!variable_offset) {
LOG_ERROR("function args number dismatch!:function %s %s value "
"number=%d, function args=%d",
function_name, function.GetMangledName(),
variable_list.GetSize(), num_function_args);
}
}
LLVMMetadataRef ParamLocation = LLVMDIBuilderCreateDebugLocation(
@ -378,9 +395,10 @@ 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));
for (uint32_t function_arg_idx = 0; function_arg_idx < num_function_args;
++function_arg_idx) {
uint32_t variable_idx = variable_offset + function_arg_idx;
SBValue variable(variable_list.GetValueAtIndex(variable_idx));
if (variable.IsValid()) {
SBDeclaration dec(variable.GetDeclaration());
auto valtype = variable.GetType();
@ -390,12 +408,11 @@ lldb_function_to_function_dbi(const AOTCompContext *comp_ctx,
const char *varname = variable.GetName();
LLVMMetadataRef ParamVar = LLVMDIBuilderCreateParameterVariable(
DIB, FunctionMetadata, varname, varname ? strlen(varname) : 0,
function_arg_idx + 1 + 1,
variable_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);
LLVMValueRef Param = LLVMGetParam(func_ctx->func, variable_idx + 1);
LLVMDIBuilderInsertDbgValueAtEnd(DIB, Param, ParamVar,
ParamExpression, ParamLocation,
block_curr);