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Diffstat (limited to 'llvm/docs')
| -rw-r--r-- | llvm/docs/LangRef.rst | 11 |
1 files changed, 11 insertions, 0 deletions
diff --git a/llvm/docs/LangRef.rst b/llvm/docs/LangRef.rst index 7b74971c817..2322bbfd7a6 100644 --- a/llvm/docs/LangRef.rst +++ b/llvm/docs/LangRef.rst @@ -4729,6 +4729,17 @@ The current supported opcode vocabulary is limited: of the stack is treated as an address. The second stack entry is treated as an address space identifier. - ``DW_OP_stack_value`` marks a constant value. +- If an expression is marked with ``DW_OP_entry_value`` all register and + memory read operations refer to the respective value at the function entry. + The first operand of ``DW_OP_entry_value`` is the size of following + DWARF expression. + ``DW_OP_entry_value`` may appear after the ``LiveDebugValues`` pass. + LLVM only supports entry values for function parameters + that are unmodified throughout a function and that are described as + simple register location descriptions. + ``DW_OP_entry_value`` may also appear after the ``AsmPrinter`` pass when + a call site parameter value (``DW_AT_call_site_parameter_value``) + is represented as entry value of the parameter. DWARF specifies three kinds of simple location descriptions: Register, memory, and implicit location descriptions. Note that a location description is |
